VDScript.cpp revision c299849be8ae3544715e8806e1433cae67d93e2e
/** $Id$ */
/** @file
*
* VBox HDD container test utility - scripting engine.
*/
/*
* Copyright (C) 2013 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/** @page pg_vd_script VDScript - Simple scripting language for VD I/O testing.
*
* This component implements a very simple scripting language to make testing the VD
* library more flexible and testcases faster to implement without the need to recompile
* everything after it changed.
* The language is a small subset of the C language. It doesn't support unions, structs,
* global variables, typedefed types or pointers (yet). It also adds a boolean and a string type.
* Strings are immutable and only to print messages from the script.
* There are also not the default types like int or unsigned because theire ranges are architecture
* dependent. Instead VDScript uses uint8_t, int8_t, ... as primitive types.
*
* Why inventing a completely new language?
*
* Well it is not a completely new language to start with, it is a subset of C and the
* language can be extended later on to reach the full C language later on.
* Second, there is no static typed scripting language I like which could be implemented
* and finally because I can ;)
* The code implementing the scripting engine is designed to be easily incorporated into other
* code. Could be used as a scripting language for the VBox debugger for example or in the scm
* tool to automatically rewrite C code using the AST VDSCript generates...
*
* The syntax of VDSCript is derived from the C syntax. The syntax of C in BNF was taken
* from: http://www.csci.csusb.edu/dick/samples/c.syntax.html
* and: http://slps.github.com/zoo/c/iso-9899-tc3.html
* and: http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf
*/
#define LOGGROUP LOGGROUP_DEFAULT
#include <iprt/string.h>
#include <iprt/list.h>
#include <iprt/mem.h>
#include <iprt/ctype.h>
#include <iprt/stream.h>
#include <VBox/log.h>
#include "VDScriptAst.h"
#include "VDScriptInternal.h"
/**
* VD script token class.
*/
typedef enum VDTOKENCLASS
{
/** Invalid. */
VDTOKENCLASS_INVALID = 0,
/** Identifier class. */
VDTOKENCLASS_IDENTIFIER,
/** Numerical constant. */
VDTOKENCLASS_NUMCONST,
/** String constant. */
VDTOKENCLASS_STRINGCONST,
/** Operators */
VDTOKENCLASS_OPERATORS,
/** Reserved keyword */
VDTOKENCLASS_KEYWORD,
/** Punctuator */
VDTOKENCLASS_PUNCTUATOR,
/** End of stream */
VDTOKENCLASS_EOS,
/** 32bit hack. */
VDTOKENCLASS_32BIT_HACK = 0x7fffffff
} VDTOKENCLASS;
/** Pointer to a token class. */
typedef VDTOKENCLASS *PVDTOKENCLASS;
/**
* Keyword types.
*/
typedef enum VDSCRIPTTOKENKEYWORD
{
VDSCRIPTTOKENKEYWORD_INVALID = 0,
VDSCRIPTTOKENKEYWORD_CONTINUE,
VDSCRIPTTOKENKEYWORD_REGISTER,
VDSCRIPTTOKENKEYWORD_RESTRICT,
VDSCRIPTTOKENKEYWORD_VOLATILE,
VDSCRIPTTOKENKEYWORD_TYPEDEF,
VDSCRIPTTOKENKEYWORD_DEFAULT,
VDSCRIPTTOKENKEYWORD_EXTERN,
VDSCRIPTTOKENKEYWORD_STATIC,
VDSCRIPTTOKENKEYWORD_RETURN,
VDSCRIPTTOKENKEYWORD_SWITCH,
VDSCRIPTTOKENKEYWORD_STRUCT,
VDSCRIPTTOKENKEYWORD_WHILE,
VDSCRIPTTOKENKEYWORD_BREAK,
VDSCRIPTTOKENKEYWORD_CONST,
VDSCRIPTTOKENKEYWORD_FALSE,
VDSCRIPTTOKENKEYWORD_TRUE,
VDSCRIPTTOKENKEYWORD_ELSE,
VDSCRIPTTOKENKEYWORD_CASE,
VDSCRIPTTOKENKEYWORD_AUTO,
VDSCRIPTTOKENKEYWORD_FOR,
VDSCRIPTTOKENKEYWORD_IF,
VDSCRIPTTOKENKEYWORD_DO,
VDSCRIPTTOKENKEYWORD_32BIT_HACK = 0x7fffffff
} VDSCRIPTTOKENKEYWORD;
/** Pointer to a keyword type. */
typedef VDSCRIPTTOKENKEYWORD *PVDSCRIPTTOKENKEYWORD;
/**
* VD script token.
*/
typedef struct VDSCRIPTTOKEN
{
/** Token class. */
VDTOKENCLASS enmClass;
/** Token position in the source buffer. */
VDSRCPOS Pos;
/** Data based on the token class. */
union
{
/** Identifier. */
struct
{
/** Pointer to the start of the identifier. */
const char *pszIde;
/** Number of characters for the identifier excluding the null terminator. */
size_t cchIde;
} Ide;
/** Numerical constant. */
struct
{
uint64_t u64;
} NumConst;
/** String constant */
struct
{
/** Pointer to the start of the string constant. */
const char *pszString;
/** Number of characters of the string, including the null terminator. */
size_t cchString;
} StringConst;
/** Operator */
struct
{
/** The operator string. */
char aszOp[4]; /** Maximum of 3 for >>= + null terminator. */
} Operator;
/** Keyword. */
struct
{
/** The keyword type. */
VDSCRIPTTOKENKEYWORD enmKeyword;
} Keyword;
/** Punctuator. */
struct
{
/** The punctuator in question. */
char chPunctuator;
} Punctuator;
} Class;
} VDSCRIPTTOKEN;
/** Pointer to a script token. */
typedef VDSCRIPTTOKEN *PVDSCRIPTTOKEN;
/** Pointer to a const script token. */
typedef const VDSCRIPTTOKEN *PCVDSCRIPTTOKEN;
/**
* Tokenizer state.
*/
typedef struct VDTOKENIZER
{
/** Char buffer to read from. */
const char *pszInput;
/** Current position ininput buffer. */
VDSRCPOS Pos;
/** Token 1. */
VDSCRIPTTOKEN Token1;
/** Token 2. */
VDSCRIPTTOKEN Token2;
/** Pointer to the current active token. */
PVDSCRIPTTOKEN pTokenCurr;
/** The next token in the input stream (used for peeking). */
PVDSCRIPTTOKEN pTokenNext;
} VDTOKENIZER;
/**
* Operators entry.
*/
typedef struct VDSCRIPTOP
{
/** Operator string. */
const char *pszOp;
/** Size of the operator in characters without zero terminator. */
size_t cchOp;
} VDSCRIPTOP;
/** Pointer to a script operator. */
typedef VDSCRIPTOP *PVDSCRIPTOP;
/**
* Known operators array, sort from higest character count to lowest.
*/
static VDSCRIPTOP g_aScriptOps[] =
{
{">>=", 3},
{"<<=", 3},
{"+=", 2},
{"-=", 2},
{"/=", 2},
{"%=", 2},
{"&=", 2},
{"|=", 2},
{"^=", 2},
{"&&", 2},
{"||", 2},
{"<<", 2},
{">>", 2},
{"++", 2},
{"--", 2},
{"==", 2},
{"!=", 2},
{">=", 2},
{"<=", 2},
{"->", 2},
{"=", 1},
{"+", 1},
{"-", 1},
{"*", 1},
{"/", 1},
{"%", 1},
{"|", 1},
{"&", 1},
{"^", 1},
{"<", 1},
{">", 1},
{"!", 1},
{"~", 1},
{".", 1}
};
/**
* Known punctuators.
*/
static VDSCRIPTOP g_aScriptPunctuators[] =
{
{"(", 1},
{")", 1},
{"{", 1},
{"}", 1},
{",", 1},
{";", 1},
};
/**
* Keyword entry.
*/
typedef struct VDSCRIPTKEYWORD
{
/** Keyword string. */
const char *pszKeyword;
/** Size of the string in characters without zero terminator. */
size_t cchKeyword;
/** Keyword type. */
VDSCRIPTTOKENKEYWORD enmKeyword;
} VDSCRIPTKEYWORD;
/** */
typedef VDSCRIPTKEYWORD *PVDSCRIPTKEYWORD;
/**
* Known keywords.
*/
static VDSCRIPTKEYWORD g_aKeywords[] =
{
{"continue", 8, VDSCRIPTTOKENKEYWORD_CONTINUE},
{"register", 8, VDSCRIPTTOKENKEYWORD_REGISTER},
{"restrict", 8, VDSCRIPTTOKENKEYWORD_RESTRICT},
{"voaltile", 8, VDSCRIPTTOKENKEYWORD_VOLATILE},
{"typedef", 7, VDSCRIPTTOKENKEYWORD_TYPEDEF},
{"default", 7, VDSCRIPTTOKENKEYWORD_DEFAULT},
{"extern", 6, VDSCRIPTTOKENKEYWORD_EXTERN},
{"static", 6, VDSCRIPTTOKENKEYWORD_STATIC},
{"return", 6, VDSCRIPTTOKENKEYWORD_RETURN},
{"switch", 6, VDSCRIPTTOKENKEYWORD_SWITCH},
{"struct", 6, VDSCRIPTTOKENKEYWORD_STRUCT},
{"while", 5, VDSCRIPTTOKENKEYWORD_WHILE},
{"break", 5, VDSCRIPTTOKENKEYWORD_BREAK},
{"const", 5, VDSCRIPTTOKENKEYWORD_CONST},
{"false", 5, VDSCRIPTTOKENKEYWORD_FALSE},
{"true", 4, VDSCRIPTTOKENKEYWORD_TRUE},
{"else", 4, VDSCRIPTTOKENKEYWORD_ELSE},
{"case", 4, VDSCRIPTTOKENKEYWORD_CASE},
{"auto", 4, VDSCRIPTTOKENKEYWORD_AUTO},
{"for", 3, VDSCRIPTTOKENKEYWORD_FOR},
{"if", 2, VDSCRIPTTOKENKEYWORD_IF},
{"do", 2, VDSCRIPTTOKENKEYWORD_DO}
};
static int vdScriptParseCompoundStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeCompound);
static int vdScriptParseStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeStmt);
static int vdScriptParseExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
static int vdScriptParseAssignmentExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
static int vdScriptParseCastExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
static int vdScriptParseConstExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr);
/**
* Returns whether the tokenizer reached the end of the stream.
*
* @returns true if the tokenizer reached the end of stream marker
* false otherwise.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(bool) vdScriptTokenizerIsEos(PVDTOKENIZER pTokenizer)
{
return *pTokenizer->pszInput == '\0';
}
/**
* Skip one character in the input stream.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(void) vdScriptTokenizerSkipCh(PVDTOKENIZER pTokenizer)
{
pTokenizer->pszInput++;
pTokenizer->Pos.iChStart++;
pTokenizer->Pos.iChEnd++;
}
/**
* Returns the next char in the input buffer without advancing it.
*
* @returns Next character in the input buffer.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(char) vdScriptTokenizerPeekCh(PVDTOKENIZER pTokenizer)
{
return vdScriptTokenizerIsEos(pTokenizer)
? '\0'
: *(pTokenizer->pszInput + 1);
}
/**
* Returns the next character in the input buffer advancing the internal
* position.
*
* @returns Next character in the stream.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(char) vdScriptTokenizerGetCh(PVDTOKENIZER pTokenizer)
{
char ch;
if (vdScriptTokenizerIsEos(pTokenizer))
ch = '\0';
else
ch = *pTokenizer->pszInput;
return ch;
}
/**
* Sets a new line for the tokenizer.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(void) vdScriptTokenizerNewLine(PVDTOKENIZER pTokenizer, unsigned cSkip)
{
pTokenizer->pszInput += cSkip;
pTokenizer->Pos.iLine++;
pTokenizer->Pos.iChStart = 1;
pTokenizer->Pos.iChEnd = 1;
}
/**
* Checks whether the current position in the input stream is a new line
* and skips it.
*
* @returns Flag whether there was a new line at the current position
* in the input buffer.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(bool) vdScriptTokenizerIsSkipNewLine(PVDTOKENIZER pTokenizer)
{
bool fNewline = true;
if ( vdScriptTokenizerGetCh(pTokenizer) == '\r'
&& vdScriptTokenizerPeekCh(pTokenizer) == '\n')
vdScriptTokenizerNewLine(pTokenizer, 2);
else if (vdScriptTokenizerGetCh(pTokenizer) == '\n')
vdScriptTokenizerNewLine(pTokenizer, 1);
else
fNewline = false;
return fNewline;
}
/**
* Skips a multi line comment.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(void) vdScriptTokenizerSkipComment(PVDTOKENIZER pTokenizer)
{
while ( !vdScriptTokenizerIsEos(pTokenizer)
&& ( vdScriptTokenizerGetCh(pTokenizer) != '*'
|| vdScriptTokenizerPeekCh(pTokenizer) != '/'))
{
if (!vdScriptTokenizerIsSkipNewLine(pTokenizer))
vdScriptTokenizerSkipCh(pTokenizer);
}
if (!vdScriptTokenizerIsEos(pTokenizer))
vdScriptTokenizerSkipCh(pTokenizer);
if (!vdScriptTokenizerIsEos(pTokenizer))
vdScriptTokenizerSkipCh(pTokenizer);
}
/**
* Skip all whitespace starting from the current input buffer position.
* Skips all present comments too.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(void) vdScriptTokenizerSkipWhitespace(PVDTOKENIZER pTokenizer)
{
while (!vdScriptTokenizerIsEos(pTokenizer))
{
while ( vdScriptTokenizerGetCh(pTokenizer) == ' '
|| vdScriptTokenizerGetCh(pTokenizer) == '\t')
vdScriptTokenizerSkipCh(pTokenizer);
if ( !vdScriptTokenizerIsEos(pTokenizer)
&& !vdScriptTokenizerIsSkipNewLine(pTokenizer))
{
if ( vdScriptTokenizerGetCh(pTokenizer) == '/'
&& vdScriptTokenizerPeekCh(pTokenizer) == '*')
{
vdScriptTokenizerSkipCh(pTokenizer);
vdScriptTokenizerSkipCh(pTokenizer);
vdScriptTokenizerSkipComment(pTokenizer);
}
else
break; /* Skipped everything, next is some real content. */
}
}
}
/**
* Get an identifier token from the tokenizer.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
* @param pToken The uninitialized token.
*/
static void vdScriptTokenizerGetIdeOrKeyword(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
char ch;
size_t cchIde = 0;
bool fIsKeyword = false;
const char *pszIde = pTokenizer->pszInput;
pToken->Pos = pTokenizer->Pos;
Assert(RT_C_IS_ALPHA(*pszIde) || *pszIde == '_' );
do
{
cchIde++;
vdScriptTokenizerSkipCh(pTokenizer);
ch = vdScriptTokenizerGetCh(pTokenizer);
}
while (RT_C_IS_ALNUM(ch) || ch == '_');
/* Check whether we got an identifier or an reserved keyword. */
for (unsigned i = 0; i < RT_ELEMENTS(g_aKeywords); i++)
{
if (!RTStrNCmp(g_aKeywords[i].pszKeyword, pszIde, g_aKeywords[i].cchKeyword))
{
fIsKeyword = true;
pToken->enmClass = VDTOKENCLASS_KEYWORD;
pToken->Class.Keyword.enmKeyword = g_aKeywords[i].enmKeyword;
break;
}
}
if (!fIsKeyword)
{
pToken->enmClass = VDTOKENCLASS_IDENTIFIER;
pToken->Class.Ide.pszIde = pszIde;
pToken->Class.Ide.cchIde = cchIde;
}
pToken->Pos.iChEnd += cchIde;
}
/**
* Get a numerical constant from the tokenizer.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
* @param pToken The uninitialized token.
*/
static void vdScriptTokenizerGetNumberConst(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
unsigned uBase = 10;
char *pszNext = NULL;
Assert(RT_C_IS_DIGIT(vdScriptTokenizerGetCh(pTokenizer)));
/* Let RTStrToUInt64Ex() do all the work, looks C compliant :). */
pToken->enmClass = VDTOKENCLASS_NUMCONST;
int rc = RTStrToUInt64Ex(pTokenizer->pszInput, &pszNext, 0, &pToken->Class.NumConst.u64);
Assert(RT_SUCCESS(rc) || rc == VWRN_TRAILING_CHARS || rc == VWRN_TRAILING_SPACES);
/** @todo: Handle number to big, throw a warning */
unsigned cchNumber = pszNext - pTokenizer->pszInput;
for (unsigned i = 0; i < cchNumber; i++)
vdScriptTokenizerSkipCh(pTokenizer);
/* Check for a supported suffix, supported are K|M|G. */
if (vdScriptTokenizerGetCh(pTokenizer) == 'K')
{
pToken->Class.NumConst.u64 *= _1K;
vdScriptTokenizerSkipCh(pTokenizer);
}
else if (vdScriptTokenizerGetCh(pTokenizer) == 'M')
{
pToken->Class.NumConst.u64 *= _1M;
vdScriptTokenizerSkipCh(pTokenizer);
}
else if (vdScriptTokenizerGetCh(pTokenizer) == 'G')
{
pToken->Class.NumConst.u64 *= _1G;
vdScriptTokenizerSkipCh(pTokenizer);
}
else if (vdScriptTokenizerGetCh(pTokenizer) == 'T')
{
pToken->Class.NumConst.u64 *= _1T;
vdScriptTokenizerSkipCh(pTokenizer);
}
}
/**
* Parses a string constant.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
* @param pToken The uninitialized token.
*
* @remarks: No escape sequences allowed at this time.
*/
static void vdScriptTokenizerGetStringConst(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
size_t cchStr = 0;
Assert(vdScriptTokenizerGetCh(pTokenizer) == '\"');
vdScriptTokenizerSkipCh(pTokenizer); /* Skip " */
pToken->enmClass = VDTOKENCLASS_STRINGCONST;
pToken->Pos = pTokenizer->Pos;
pToken->Class.StringConst.pszString = pTokenizer->pszInput;
while (vdScriptTokenizerGetCh(pTokenizer) != '\"')
{
cchStr++;
vdScriptTokenizerSkipCh(pTokenizer);
}
vdScriptTokenizerSkipCh(pTokenizer); /* Skip closing " */
pToken->Class.StringConst.cchString = cchStr;
pToken->Pos.iChEnd += cchStr;
}
/**
* Get the end of stream token.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
* @param pToken The uninitialized token.
*/
static void vdScriptTokenizerGetEos(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
Assert(vdScriptTokenizerGetCh(pTokenizer) == '\0');
pToken->enmClass = VDTOKENCLASS_EOS;
pToken->Pos = pTokenizer->Pos;
}
/**
* Get operator or punctuator token.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
* @param pToken The uninitialized token.
*/
static void vdScriptTokenizerGetOperatorOrPunctuator(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
bool fOpFound = false;
pToken->enmClass = VDTOKENCLASS_INVALID;
pToken->Pos = pTokenizer->Pos;
/*
* Use table based approach here, not the fastest solution but enough for our purpose
* for now.
*/
for (unsigned i = 0; i < RT_ELEMENTS(g_aScriptOps); i++)
{
if (!RTStrNCmp(g_aScriptOps[i].pszOp, pTokenizer->pszInput, g_aScriptOps[i].cchOp))
{
memset(pToken->Class.Operator.aszOp, 0, sizeof(pToken->Class.Operator.aszOp));
int rc = RTStrCopy(pToken->Class.Operator.aszOp, sizeof(pToken->Class.Operator.aszOp), g_aScriptOps[i].pszOp);
AssertRC(rc);
pToken->enmClass = VDTOKENCLASS_OPERATORS;
pToken->Pos.iChEnd += g_aScriptOps[i].cchOp;
/** @todo: Make this prettier. */
for (unsigned j = 0; j < g_aScriptOps[i].cchOp; j++)
vdScriptTokenizerSkipCh(pTokenizer);
fOpFound = true;
break;
}
}
if (!fOpFound)
{
for (unsigned i = 0; i < RT_ELEMENTS(g_aScriptPunctuators); i++)
{
if (!RTStrNCmp(g_aScriptPunctuators[i].pszOp, pTokenizer->pszInput, g_aScriptPunctuators[i].cchOp))
{
pToken->Pos.iChEnd += g_aScriptPunctuators[i].cchOp;
pToken->enmClass = VDTOKENCLASS_PUNCTUATOR;
pToken->Class.Punctuator.chPunctuator = *g_aScriptPunctuators[i].pszOp;
vdScriptTokenizerSkipCh(pTokenizer);
fOpFound = true;
break;
}
}
}
}
/**
* Read the next token from the tokenizer stream.
*
* @returns nothing.
* @param pTokenizer The tokenizer to read from.
* @param pToken Uninitialized token to fill the token data into.
*/
static void vdScriptTokenizerReadNextToken(PVDTOKENIZER pTokenizer, PVDSCRIPTTOKEN pToken)
{
/* Skip all eventually existing whitespace, newlines and comments first. */
vdScriptTokenizerSkipWhitespace(pTokenizer);
char ch = vdScriptTokenizerGetCh(pTokenizer);
if (RT_C_IS_ALPHA(ch) || ch == '_')
vdScriptTokenizerGetIdeOrKeyword(pTokenizer, pToken);
else if (RT_C_IS_DIGIT(ch))
vdScriptTokenizerGetNumberConst(pTokenizer, pToken);
else if (ch == '\"')
vdScriptTokenizerGetStringConst(pTokenizer, pToken);
else if (ch == '\0')
vdScriptTokenizerGetEos(pTokenizer, pToken);
else
vdScriptTokenizerGetOperatorOrPunctuator(pTokenizer, pToken);
}
/**
* Create a new tokenizer.
*
* @returns Pointer to the new tokenizer state on success.
* NULL if out of memory.
* @param pszInput The input to create the tokenizer for.
*/
static PVDTOKENIZER vdScriptTokenizerCreate(const char *pszInput)
{
PVDTOKENIZER pTokenizer = (PVDTOKENIZER)RTMemAllocZ(sizeof(VDTOKENIZER));
if (pTokenizer)
{
pTokenizer->pszInput = pszInput;
pTokenizer->Pos.iLine = 1;
pTokenizer->Pos.iChStart = 1;
pTokenizer->Pos.iChEnd = 1;
pTokenizer->pTokenCurr = &pTokenizer->Token1;
pTokenizer->pTokenNext = &pTokenizer->Token2;
/* Fill the tokenizer with two first tokens. */
vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenCurr);
vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
}
return pTokenizer;
}
/**
* Destroys a given tokenizer state.
*
* @returns nothing.
* @param pTokenizer The tokenizer to destroy.
*/
static void vdScriptTokenizerDestroy(PVDTOKENIZER pTokenizer)
{
RTMemFree(pTokenizer);
}
/**
* Get the current token in the input stream.
*
* @returns Pointer to the next token in the stream.
* @param pTokenizer The tokenizer to destroy.
*/
DECLINLINE(PCVDSCRIPTTOKEN) vdScriptTokenizerGetToken(PVDTOKENIZER pTokenizer)
{
return pTokenizer->pTokenCurr;
}
/**
* Get the class of the current token.
*
* @returns Class of the current token.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(VDTOKENCLASS) vdScriptTokenizerGetTokenClass(PVDTOKENIZER pTokenizer)
{
return pTokenizer->pTokenCurr->enmClass;
}
/**
* Returns the token class of the next token in the stream.
*
* @returns Token class of the next token.
* @param pTokenizer The tokenizer state.
*/
DECLINLINE(VDTOKENCLASS) vdScriptTokenizerPeekNextClass(PVDTOKENIZER pTokenizer)
{
return pTokenizer->pTokenNext->enmClass;
}
/**
* Consume the current token advancing to the next in the stream.
*
* @returns nothing.
* @param pTokenizer The tokenizer state.
*/
static void vdScriptTokenizerConsume(PVDTOKENIZER pTokenizer)
{
PVDSCRIPTTOKEN pTokenTmp = pTokenizer->pTokenCurr;
/* Switch next token to current token and read in the next token. */
pTokenizer->pTokenCurr = pTokenizer->pTokenNext;
pTokenizer->pTokenNext = pTokenTmp;
vdScriptTokenizerReadNextToken(pTokenizer, pTokenizer->pTokenNext);
}
/**
* Check whether the next token in the input stream is a punctuator and matches the given
* character.
*
* @returns true if the token matched.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param chCheck The punctuator to check against.
*/
static bool vdScriptTokenizerIsPunctuatorEqual(PVDTOKENIZER pTokenizer, char chCheck)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
if ( pToken->enmClass == VDTOKENCLASS_PUNCTUATOR
&& pToken->Class.Punctuator.chPunctuator == chCheck)
return true;
return false;
}
/**
* Check whether the next token in the input stream is a punctuator and matches the given
* character and skips it.
*
* @returns true if the token matched and was skipped.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param chCheck The punctuator to check against.
*/
static bool vdScriptTokenizerSkipIfIsPunctuatorEqual(PVDTOKENIZER pTokenizer, char chCheck)
{
bool fEqual = vdScriptTokenizerIsPunctuatorEqual(pTokenizer, chCheck);
if (fEqual)
vdScriptTokenizerConsume(pTokenizer);
return fEqual;
}
/**
* Check whether the next token in the input stream is a keyword and matches the given
* keyword.
*
* @returns true if the token matched.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param enmKey The keyword to check against.
*/
static bool vdScriptTokenizerIsKeywordEqual(PVDTOKENIZER pTokenizer, VDSCRIPTTOKENKEYWORD enmKeyword)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
if ( pToken->enmClass == VDTOKENCLASS_KEYWORD
&& pToken->Class.Keyword.enmKeyword == enmKeyword)
return true;
return false;
}
/**
* Check whether the next token in the input stream is a keyword and matches the given
* keyword and skips it.
*
* @returns true if the token matched and was skipped.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param enmKey The keyword to check against.
*/
static bool vdScriptTokenizerSkipIfIsKeywordEqual(PVDTOKENIZER pTokenizer, VDSCRIPTTOKENKEYWORD enmKeyword)
{
bool fEqual = vdScriptTokenizerIsKeywordEqual(pTokenizer, enmKeyword);
if (fEqual)
vdScriptTokenizerConsume(pTokenizer);
return fEqual;
}
/**
* Check whether the next token in the input stream is a keyword and matches the given
* keyword.
*
* @returns true if the token matched.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param pszOp The operation to check against.
*/
static bool vdScriptTokenizerIsOperatorEqual(PVDTOKENIZER pTokenizer, const char *pszOp)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pTokenizer);
if ( pToken->enmClass == VDTOKENCLASS_OPERATORS
&& !RTStrCmp(pToken->Class.Operator.aszOp, pszOp))
return true;
return false;
}
/**
* Check whether the next token in the input stream is an operator and matches the given
* keyword and skips it.
*
* @returns true if the token matched and was skipped.
* false otherwise.
* @param pTokenizer The tokenizer state.
* @param pszOp The operation to check against.
*/
static bool vdScriptTokenizerSkipIfIsOperatorEqual(PVDTOKENIZER pTokenizer, const char *pszOp)
{
bool fEqual = vdScriptTokenizerIsOperatorEqual(pTokenizer, pszOp);
if (fEqual)
vdScriptTokenizerConsume(pTokenizer);
return fEqual;
}
/**
* Record an error while parsing.
*
* @returns VBox status code passed.
*/
static int vdScriptParserError(PVDSCRIPTCTXINT pThis, int rc, RT_SRC_POS_DECL, const char *pszFmt, ...)
{
NOREF(pThis);
NOREF(pszFmt);
RTPrintf(pszFmt);
return rc;
}
/**
* Puts the next identifier AST node on the stack.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeIde Where to store the identifier AST node on success.
*/
static int vdScriptParseIde(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTIDE *ppAstNodeIde)
{
int rc = VINF_SUCCESS;
PCVDSCRIPTTOKEN pToken;
LogFlowFunc(("pThis=%p ppAstNodeIde=%p\n", pThis, ppAstNodeIde));
pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
if (pToken->enmClass != VDTOKENCLASS_IDENTIFIER)
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected identifer got...\n");
else
{
/* Create new AST node and push onto stack. */
PVDSCRIPTASTIDE pAstNodeIde = vdScriptAstNodeIdeAlloc(pToken->Class.Ide.cchIde);
if (pAstNodeIde)
{
rc = RTStrCopyEx(pAstNodeIde->aszIde, pToken->Class.Ide.cchIde + 1, pToken->Class.Ide.pszIde, pToken->Class.Ide.cchIde);
AssertRC(rc);
pAstNodeIde->cchIde = pToken->Class.Ide.cchIde;
*ppAstNodeIde = pAstNodeIde;
vdScriptTokenizerConsume(pThis->pTokenizer);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating identifier AST node\n");
}
LogFlowFunc(("returns %Rrc\n", rc));
return rc;
}
/**
* Parse a primary expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the primary expression on success.
*/
static int vdScriptParsePrimaryExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
rc = vdScriptParseExpression(pThis, ppAstNodeExpr);
if (RT_SUCCESS(rc)
&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
}
else
{
PVDSCRIPTASTEXPR pExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExpr)
{
if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER)
{
PVDSCRIPTASTIDE pIde = NULL;
rc = vdScriptParseIde(pThis, &pIde);
if (RT_SUCCESS(rc))
{
pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_IDENTIFIER;
pExpr->pIde = pIde;
}
}
else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_NUMCONST)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_NUMCONST;
pExpr->u64 = pToken->Class.NumConst.u64;
vdScriptTokenizerConsume(pThis->pTokenizer);
}
else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_STRINGCONST)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_STRINGCONST;
pExpr->pszStr = RTStrDupN(pToken->Class.StringConst.pszString, pToken->Class.StringConst.cchString);
vdScriptTokenizerConsume(pThis->pTokenizer);
if (!pExpr->pszStr)
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating string\n");
}
else if (vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_KEYWORD)
{
PCVDSCRIPTTOKEN pToken = vdScriptTokenizerGetToken(pThis->pTokenizer);
pExpr->enmType = VDSCRIPTEXPRTYPE_PRIMARY_BOOLEAN;
if (pToken->Class.Keyword.enmKeyword == VDSCRIPTTOKENKEYWORD_TRUE)
pExpr->f = true;
else if (pToken->Class.Keyword.enmKeyword == VDSCRIPTTOKENKEYWORD_FALSE)
pExpr->f = false;
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Unexpected keyword, expected true or false\n");
vdScriptTokenizerConsume(pThis->pTokenizer);
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\" | identifier | constant | string, got ...\n");
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pExpr->Core);
else
*ppAstNodeExpr = pExpr;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse an argument list for a function call.
*
* @returns VBox status code.
* @param pThis The script context.
* @param pFnCall The function call AST node.
*/
static int vdScriptParseFnCallArgumentList(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR pFnCall)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseAssignmentExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
RTListAppend(&pFnCall->FnCall.ListArgs, &pExpr->Core.ListNode);
while (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','))
{
rc = vdScriptParseAssignmentExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
RTListAppend(&pFnCall->FnCall.ListArgs, &pExpr->Core.ListNode);
else
break;
}
if ( RT_SUCCESS(rc)
&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a postfix expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* postfix-expression:
* primary-expression
* postfix-expression ( argument-expression )
* postfix-expression ++
* postfix-expression --
* postfix-expression . identifier
* postfix-expression -> identifier
* @note: Not supported so far are:
* ( type-name ) { initializer-list }
* ( type-name ) { initializer-list , }
*/
static int vdScriptParsePostfixExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParsePrimaryExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
while (true)
{
PVDSCRIPTASTEXPR pExprNew = NULL;
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "++"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_INCREMENT;
pExprNew->pExpr = pExpr;
pExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "--"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DECREMENT;
pExprNew->pExpr = pExpr;
pExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "->"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
PVDSCRIPTASTIDE pIde = NULL;
rc = vdScriptParseIde(pThis, &pIde);
if (RT_SUCCESS(rc))
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DEREFERENCE;
pExprNew->Deref.pIde = pIde;
pExprNew->Deref.pExpr = pExpr;
pExpr = pExprNew;
}
else
vdScriptAstNodeFree(&pExprNew->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "."))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
PVDSCRIPTASTIDE pIde = NULL;
rc = vdScriptParseIde(pThis, &pIde);
if (RT_SUCCESS(rc))
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_DOT;
pExprNew->Deref.pIde = pIde;
pExprNew->Deref.pExpr = pExpr;
pExpr = pExprNew;
}
else
vdScriptAstNodeFree(&pExprNew->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_POSTFIX_FNCALL;
RTListInit(&pExprNew->FnCall.ListArgs);
if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
rc = vdScriptParseFnCallArgumentList(pThis, pExprNew);
pExprNew->FnCall.pFnIde = pExpr;
pExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
if (RT_FAILURE(rc))
break;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse an unary expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* unary-expression:
* postfix-expression
* ++ unary-expression
* -- unary-expression
* + cast-expression
* - cast-expression
* ~ cast-expression
* ! cast-expression
* & cast-expression
* * cast-expression
*/
static int vdScriptParseUnaryExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
PVDSCRIPTASTEXPR pExprTop = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
/** @todo: Think about a more beautiful way of parsing this. */
while (true)
{
bool fQuit = false;
bool fCastExprFollows = false;
PVDSCRIPTASTEXPR pExprNew = NULL;
VDSCRIPTEXPRTYPE enmType = VDSCRIPTEXPRTYPE_INVALID;
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "++"))
enmType = VDSCRIPTEXPRTYPE_UNARY_INCREMENT;
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "--"))
enmType = VDSCRIPTEXPRTYPE_UNARY_DECREMENT;
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_POSSIGN;
fCastExprFollows = true;
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_NEGSIGN;
fCastExprFollows = true;
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "~"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_INVERT;
fCastExprFollows = true;
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "!"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_NEGATE;
fCastExprFollows = true;
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_REFERENCE;
fCastExprFollows = true;
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*"))
{
enmType = VDSCRIPTEXPRTYPE_UNARY_DEREFERENCE;
fCastExprFollows = true;
}
if (enmType != VDSCRIPTEXPRTYPE_INVALID)
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = enmType;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
if ( RT_SUCCESS(rc)
&& fCastExprFollows)
{
PVDSCRIPTASTEXPR pCastExpr = NULL;
rc = vdScriptParseCastExpression(pThis, &pCastExpr);
if (RT_SUCCESS(rc))
pExprNew->pExpr = pCastExpr;
else
vdScriptAstNodeFree(&pExprNew->Core);
fQuit = true;
}
}
else
{
/* Must be a postfix expression. */
rc = vdScriptParsePostfixExpression(pThis, &pExprNew);
fQuit = true;
}
if (RT_SUCCESS(rc))
{
if (!pExprTop)
{
pExprTop = pExprNew;
pExpr = pExprNew;
}
else
{
pExpr->pExpr = pExprNew;
pExpr = pExprNew;
}
if (fQuit)
break;
}
else
break;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExprTop;
else if (pExprTop)
vdScriptAstNodeFree(&pExprTop->Core);
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a storage class specifier.
*
* @returns nothing.
* @param pThis The script context.
* @param penmStorageClass Where to return the parsed storage classe.
* Contains VDSCRIPTASTSTORAGECLASS_INVALID if no
* valid storage class specifier was found.
*
* @note Syntax:
* typedef
* extern
* static
* auto
* register
*/
static void vdScriptParseStorageClassSpecifier(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTORAGECLASS penmStorageClass)
{
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_INVALID;
if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_TYPEDEF))
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_TYPEDEF;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_EXTERN))
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_EXTERN;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_STATIC))
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_STATIC;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_AUTO))
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_AUTO;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_REGISTER))
*penmStorageClass = VDSCRIPTASTSTORAGECLASS_REGISTER;
}
/**
* Parse a type qualifier.
*
* @returns nothing.
* @param pThis The script context.
* @param penmTypeQualifier Where to return the parsed type qualifier.
* Contains VDSCRIPTASTTYPEQUALIFIER_INVALID if no
* valid type qualifier was found.
*
* @note Syntax:
* const
* restrict
* volatile
*/
static void vdScriptParseTypeQualifier(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTTYPEQUALIFIER penmTypeQualifier)
{
*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_INVALID;
if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CONST))
*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_CONST;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_RESTRICT))
*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_RESTRICT;
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_VOLATILE))
*penmTypeQualifier = VDSCRIPTASTTYPEQUALIFIER_VOLATILE;
}
#if 0
/**
* Parse a struct or union specifier.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstTypeSpec Where to store the type specifier AST node on success.
* @param enmTypeSpecifier The type specifier to identify whete this is a struct or a union.
*/
static int vdScriptParseStructOrUnionSpecifier(PVDSCRIPTCTXINT pThis, , enmTypeSpecifier)
{
int rc = VINF_SUCCESS;
return rc;
}
/**
* Parse a type specifier.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstTypeSpec Where to store the type specifier AST node on success.
*
* @note Syntax:
* struct-or-union-specifier
* enum-specifier
* typedef-name (identifier: includes void, bool, uint8_t, int8_t, ... for basic integer types)
*/
static int vdScriptParseTypeSpecifier(PVDSCRIPTCTXINT pThis, )
{
int rc = VINF_SUCCESS;
if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_STRUCT))
rc = vdScriptParseStructOrUnionSpecifier(pThis, , VDSCRIPTASTTYPESPECIFIER_STRUCT);
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_UNION))
rc = vdScriptParseStructOrUnionSpecifier(pThis, , VDSCRIPTASTTYPESPECIFIER_UNION);
else
{
PVDSCRIPTASTIDE pIde = NULL;
rc = vdScriptParseIde(pThis, &pIde);
if (RT_SUCCESS(rc))
{
AssertMsgFailed(("TODO\n")); /* Parse identifier. */
}
}
return rc;
}
#endif
/**
* Parse a cast expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* cast-expression:
* unary-expression
* ( type-name ) cast-expression
*/
static int vdScriptParseCastExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
#if 0
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTTYPE pTypeName = NULL;
rc = vdScriptParseTypeName(pThis, &pTypeName);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTEXPR pExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExpr)
{
pExpr->enmType = VDSCRIPTEXPRTYPE_CAST;
rc = vdScriptParseCastExpression(pThis, &pExpr->Cast.pExpr); /** @todo: Kill recursion. */
if (RT_SUCCESS(rc))
pExpr->Cast.pTypeName = pTypeName;
else
vdScriptAstNodeFree(&pExpr->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pTypeName->Core);
}
else if (RT_SUCCESS(rc))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
}
else
#endif
rc = vdScriptParseUnaryExpression(pThis, ppAstNodeExpr);
return rc;
}
/**
* Parse a multiplicative expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* multiplicative-expression:
* cast-expression
* multiplicative-expression * cast-expression
* multiplicative-expression / cast-expression
* multiplicative-expression % cast-expression
*/
static int vdScriptParseMultiplicativeExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseCastExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
while (RT_SUCCESS(rc))
{
VDSCRIPTEXPRTYPE enmType = VDSCRIPTEXPRTYPE_INVALID;
PVDSCRIPTASTEXPR pExprNew = NULL;
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*"))
enmType = VDSCRIPTEXPRTYPE_MULTIPLICATION;
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "/"))
enmType = VDSCRIPTEXPRTYPE_DIVISION;
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "%"))
enmType = VDSCRIPTEXPRTYPE_MODULUS;
else
break;
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = enmType;
else
{
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
break;
}
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseCastExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a additive expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* additive-expression:
* multiplicative-expression
* additive-expression + multiplicative-expression
* additive-expression - multiplicative-expression
*/
static int vdScriptParseAdditiveExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseMultiplicativeExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ADDITION;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_SUBTRACTION;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseMultiplicativeExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a shift expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* shift-expression:
* additive-expression
* shift-expression << additive-expression
* shift-expression >> additive-expression
*/
static int vdScriptParseShiftExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseAdditiveExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<<"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_LSL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">>"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_LSR;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseAdditiveExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a relational expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* relational-expression:
* shift-expression
* relational-expression < shift-expression
* relational-expression > shift-expression
* relational-expression >= shift-expression
* relational-expression <= shift-expression
*/
static int vdScriptParseRelationalExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseShiftExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_LOWER;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_HIGHER;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_HIGHEREQUAL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_LOWEREQUAL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseShiftExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a equality expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* equality-expression:
* relational-expression
* equality-expression == relational-expression
* equality-expression != relational-expression
*/
static int vdScriptParseEqualityExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseRelationalExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "=="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_EQUAL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "!="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_NOTEQUAL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseRelationalExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a bitwise and expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* and-expression:
* equality-expression
* and-expression & equality-expression
*/
static int vdScriptParseBitwiseAndExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseEqualityExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_EQUAL;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseEqualityExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a bitwise xor expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* xor-expression:
* and-expression
* xor-expression ^ equality-expression
*/
static int vdScriptParseBitwiseXorExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseBitwiseAndExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "^"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_BITWISE_XOR;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseBitwiseAndExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a bitwise or expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* or-expression:
* xor-expression
* or-expression | xor-expression
*/
static int vdScriptParseBitwiseOrExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseBitwiseXorExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "|"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_BITWISE_OR;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseBitwiseXorExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a logical and expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* logical-and-expression:
* or-expression
* logical-and-expression | or-expression
*/
static int vdScriptParseLogicalAndExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseBitwiseOrExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&&"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_LOGICAL_AND;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseBitwiseOrExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a logical or expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* logical-or-expression:
* logical-and-expression
* logical-or-expression | logical-and-expression
*/
static int vdScriptParseLogicalOrExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseLogicalAndExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "||"))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
{
pExprNew->enmType = VDSCRIPTEXPRTYPE_LOGICAL_OR;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseLogicalAndExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse a conditional expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note: VDScript doesn't support logical-or-expression ? expression : conditional-expression
* so a conditional expression is equal to a logical-or-expression.
*/
static int vdScriptParseCondExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
return vdScriptParseLogicalOrExpression(pThis, ppAstNodeExpr);
}
/**
* Parse a constant expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* constant-expression:
* conditional-expression
*/
static int vdScriptParseConstExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
return vdScriptParseCondExpression(pThis, ppAstNodeExpr);
}
/**
* Parse an assignment expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* assignment-expression:
* conditional-expression
* unary-expression assignment-operator assignment-expression
*/
static int vdScriptParseAssignmentExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pExpr;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseLogicalOrExpression(pThis, &pExpr);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTEXPR pExprNew = NULL;
while (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "*="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_MULT;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "/="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_DIV;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "%="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_MOD;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "+="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_ADD;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "-="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_SUB;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "<<="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_LSL;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, ">>="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_LSR;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "&="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_AND;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "^="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_XOR;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (vdScriptTokenizerSkipIfIsOperatorEqual(pThis->pTokenizer, "|="))
{
pExprNew = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pExprNew)
pExprNew->enmType = VDSCRIPTEXPRTYPE_ASSIGN_OR;
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else
break;
pExprNew->BinaryOp.pLeftExpr = pExpr;
pExpr = pExprNew;
rc = vdScriptParseLogicalOrExpression(pThis, &pExprNew);
if (RT_SUCCESS(rc))
pExpr->BinaryOp.pRightExpr = pExprNew;
}
if (RT_SUCCESS(rc))
*ppAstNodeExpr = pExpr;
else
vdScriptAstNodeFree(&pExpr->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse an expression.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeExpr Where to store the expression AST node on success.
*
* @note Syntax:
* expression:
* assignment-expression
* expression , assignment-expression
*/
static int vdScriptParseExpression(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTEXPR *ppAstNodeExpr)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTEXPR pAssignExpr = NULL;
LogFlowFunc(("pThis=%p ppAstNodeExpr=%p\n"));
rc = vdScriptParseAssignmentExpression(pThis, &pAssignExpr);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','))
{
PVDSCRIPTASTEXPR pListAssignExpr = (PVDSCRIPTASTEXPR)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_EXPRESSION);
if (pListAssignExpr)
{
pListAssignExpr->enmType = VDSCRIPTEXPRTYPE_ASSIGNMENT_LIST;
RTListInit(&pListAssignExpr->ListExpr);
RTListAppend(&pListAssignExpr->ListExpr, &pAssignExpr->Core.ListNode);
do
{
rc = vdScriptParseAssignmentExpression(pThis, &pAssignExpr);
if (RT_SUCCESS(rc))
RTListAppend(&pListAssignExpr->ListExpr, &pAssignExpr->Core.ListNode);
} while ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ','));
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pListAssignExpr->Core);
else
*ppAstNodeExpr = pListAssignExpr;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating expression AST node\n");
}
else if (RT_SUCCESS(rc))
*ppAstNodeExpr = pAssignExpr;
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parse an if statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param pAstNodeIf Uninitialized if AST node.
*
* @note The caller skipped the "if" token already.
*/
static int vdScriptParseIf(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTIF pAstNodeIf)
{
int rc = VINF_SUCCESS;
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTEXPR pCondExpr = NULL;
rc = vdScriptParseExpression(pThis, &pCondExpr);
if (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTSTMT pStmt = NULL;
PVDSCRIPTASTSTMT pElseStmt = NULL;
rc = vdScriptParseStatement(pThis, &pStmt);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_ELSE))
rc = vdScriptParseStatement(pThis, &pElseStmt);
if (RT_SUCCESS(rc))
{
pAstNodeIf->pCond = pCondExpr;
pAstNodeIf->pTrueStmt = pStmt;
pAstNodeIf->pElseStmt = pElseStmt;
}
else if (pStmt)
vdScriptAstNodeFree(&pStmt->Core);
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pCondExpr->Core);
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
return rc;
}
/**
* Parse a switch statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param pAstNodeSwitch Uninitialized switch AST node.
*
* @note The caller skipped the "switch" token already.
*/
static int vdScriptParseSwitch(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSWITCH pAstNodeSwitch)
{
int rc = VINF_SUCCESS;
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTEXPR pExpr = NULL;
rc = vdScriptParseExpression(pThis, &pExpr);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTSTMT pStmt = NULL;
rc = vdScriptParseStatement(pThis, &pStmt);
if (RT_SUCCESS(rc))
{
pAstNodeSwitch->pCond = pExpr;
pAstNodeSwitch->pStmt = pStmt;
}
else
vdScriptAstNodeFree(&pExpr->Core);
}
else if (RT_SUCCESS(rc))
{
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
vdScriptAstNodeFree(&pExpr->Core);
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
return rc;
}
/**
* Parse a while or do ... while statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param pAstNodeWhile Uninitialized while AST node.
*
* @note The caller skipped the "while" or "do" token already.
*/
static int vdScriptParseWhile(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTWHILE pAstNodeWhile, bool fDoWhile)
{
int rc = VINF_SUCCESS;
pAstNodeWhile->fDoWhile = fDoWhile;
if (fDoWhile)
{
PVDSCRIPTASTSTMT pStmt = NULL;
rc = vdScriptParseStatement(pThis, &pStmt);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_WHILE))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTEXPR pExpr = NULL;
rc = vdScriptParseExpression(pThis, &pExpr);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
{
pAstNodeWhile->pCond = pExpr;
pAstNodeWhile->pStmt = pStmt;
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
else if (RT_SUCCESS(rc))
{
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
vdScriptAstNodeFree(&pExpr->Core);
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
}
else if (RT_SUCCESS(rc))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"while\", got ...\n");
if ( RT_FAILURE(rc)
&& pStmt)
vdScriptAstNodeFree(&pStmt->Core);
}
else
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTEXPR pExpr = NULL;
rc = vdScriptParseExpression(pThis, &pExpr);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTSTMT pStmt = NULL;
rc = vdScriptParseStatement(pThis, &pStmt);
if (RT_SUCCESS(rc))
{
pAstNodeWhile->pCond = pExpr;
pAstNodeWhile->pStmt = pStmt;
}
else
vdScriptAstNodeFree(&pExpr->Core);
}
else if (RT_SUCCESS(rc))
{
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \")\", got ...\n");
vdScriptAstNodeFree(&pExpr->Core);
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
}
return rc;
}
/**
* Parse a for statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param pAstNodeFor Uninitialized for AST node.
*
* @note The caller skipped the "for" token already.
*/
static int vdScriptParseFor(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTFOR pAstNodeFor)
{
int rc = VINF_SUCCESS;
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTEXPR pExprStart = NULL;
PVDSCRIPTASTEXPR pExprCond = NULL;
PVDSCRIPTASTEXPR pExpr3 = NULL;
rc = vdScriptParseExpression(pThis, &pExprStart);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
{
rc = vdScriptParseExpression(pThis, &pExprCond);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
{
rc = vdScriptParseExpression(pThis, &pExpr3);
if ( RT_SUCCESS(rc)
&& vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTSTMT pStmt = NULL;
rc = vdScriptParseStatement(pThis, &pStmt);
if (RT_SUCCESS(rc))
{
pAstNodeFor->pExprStart = pExprStart;
pAstNodeFor->pExprCond = pExprCond;
pAstNodeFor->pExpr3 = pExpr3;
pAstNodeFor->pStmt = pStmt;
}
}
}
else if (RT_SUCCESS(rc))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
else if (RT_SUCCESS(rc))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
if (RT_FAILURE(rc))
{
if (pExprStart)
vdScriptAstNodeFree(&pExprStart->Core);
if (pExprCond)
vdScriptAstNodeFree(&pExprCond->Core);
if (pExpr3)
vdScriptAstNodeFree(&pExpr3->Core);
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\", got ...\n");
return rc;
}
/**
* Parse a declaration.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeDecl Where to store the declaration AST node on success.
*/
static int vdScriptParseDeclaration(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTDECL *ppAstNodeDecl)
{
int rc = VERR_NOT_IMPLEMENTED;
return rc;
}
/**
* Parse a statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeStmt Where to store the statement AST node on success.
*/
static int vdScriptParseStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeStmt)
{
int rc = VINF_SUCCESS;
/* Shortcut for a new compound statement. */
if (vdScriptTokenizerIsPunctuatorEqual(pThis->pTokenizer, '{'))
rc = vdScriptParseCompoundStatement(pThis, ppAstNodeStmt);
else
{
PVDSCRIPTASTSTMT pAstNodeStmt = (PVDSCRIPTASTSTMT)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_STATEMENT);
if (pAstNodeStmt)
{
if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_DEFAULT))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ':'))
{
PVDSCRIPTASTSTMT pAstNodeStmtDef = NULL;
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_DEFAULT;
rc = vdScriptParseStatement(pThis, &pAstNodeStmtDef);
if (RT_SUCCESS(rc))
pAstNodeStmt->pStmt = pAstNodeStmtDef;
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \":\", got ...\n");
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CASE))
{
PVDSCRIPTASTEXPR pAstNodeExpr = NULL;
rc = vdScriptParseCondExpression(pThis, &pAstNodeExpr);
if (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ':'))
{
PVDSCRIPTASTSTMT pAstNodeCaseStmt = NULL;
rc = vdScriptParseStatement(pThis, &pAstNodeCaseStmt);
if (RT_SUCCESS(rc))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_CASE;
pAstNodeStmt->Case.pExpr = pAstNodeExpr;
pAstNodeStmt->Case.pStmt = pAstNodeCaseStmt;
}
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \":\", got ...\n");
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pAstNodeExpr->Core);
}
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_IF))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_IF;
rc = vdScriptParseIf(pThis, &pAstNodeStmt->If);
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_SWITCH))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_SWITCH;
rc = vdScriptParseSwitch(pThis, &pAstNodeStmt->Switch);
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_WHILE))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_WHILE;
rc = vdScriptParseWhile(pThis, &pAstNodeStmt->While, false /* fDoWhile */);
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_DO))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_WHILE;
rc = vdScriptParseWhile(pThis, &pAstNodeStmt->While, true /* fDoWhile */);
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_FOR))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_FOR;
rc = vdScriptParseFor(pThis, &pAstNodeStmt->For);
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_CONTINUE))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_CONTINUE;
if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_BREAK))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_BREAK;
if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
else if (vdScriptTokenizerSkipIfIsKeywordEqual(pThis->pTokenizer, VDSCRIPTTOKENKEYWORD_RETURN))
{
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_RETURN;
if (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
{
rc = vdScriptParseExpression(pThis, &pAstNodeStmt->pExpr);
if ( RT_SUCCESS(rc)
&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
else
pAstNodeStmt->pExpr = NULL; /* No expression for return. */
}
else
{
/* Must be an expression. */
pAstNodeStmt->enmStmtType = VDSCRIPTSTMTTYPE_EXPRESSION;
rc = vdScriptParseExpression(pThis, &pAstNodeStmt->pExpr);
if ( RT_SUCCESS(rc)
&& !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ';'))
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \";\", got ...\n");
}
if (RT_SUCCESS(rc))
*ppAstNodeStmt = pAstNodeStmt;
else
vdScriptAstNodeFree(&pAstNodeStmt->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory creating statement node\n");
}
return rc;
}
/**
* Parses a compound statement.
*
* @returns VBox status code.
* @param pThis The script context.
* @param ppAstNodeCompound Where to store the compound AST node on success.
*/
static int vdScriptParseCompoundStatement(PVDSCRIPTCTXINT pThis, PVDSCRIPTASTSTMT *ppAstNodeCompound)
{
int rc = VINF_SUCCESS;
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '{'))
{
PVDSCRIPTASTSTMT pAstNodeCompound = (PVDSCRIPTASTSTMT)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_STATEMENT);
if (pAstNodeCompound)
{
pAstNodeCompound->enmStmtType = VDSCRIPTSTMTTYPE_COMPOUND;
RTListInit(&pAstNodeCompound->Compound.ListDecls);
RTListInit(&pAstNodeCompound->Compound.ListStmts);
while (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '}'))
{
/*
* Check whether we have a declaration or a statement.
* For now we assume that 2 identifier tokens specify a declaration
* (type + variable name). Having two consecutive identifers is not possible
* for a statement.
*/
if ( vdScriptTokenizerGetTokenClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER
&& vdScriptTokenizerPeekNextClass(pThis->pTokenizer) == VDTOKENCLASS_IDENTIFIER)
{
PVDSCRIPTASTDECL pAstNodeDecl = NULL;
rc = vdScriptParseDeclaration(pThis, &pAstNodeDecl);
if (RT_SUCCESS(rc))
RTListAppend(&pAstNodeCompound->Compound.ListDecls, &pAstNodeDecl->Core.ListNode);
}
else
{
PVDSCRIPTASTSTMT pAstNodeStmt = NULL;
rc = vdScriptParseStatement(pThis, &pAstNodeStmt);
if (RT_SUCCESS(rc))
RTListAppend(&pAstNodeCompound->Compound.ListStmts, &pAstNodeStmt->Core.ListNode);
}
if (RT_FAILURE(rc))
break;
}
if (RT_SUCCESS(rc))
*ppAstNodeCompound = pAstNodeCompound;
else
vdScriptAstNodeFree(&pAstNodeCompound->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory creating compound statement node\n");
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"{\" got...\n");
return rc;
}
/**
* Parses a function definition from the given tokenizer.
*
* @returns VBox status code.
* @param pThis The script context.
*/
static int vdScriptParseAddFnDef(PVDSCRIPTCTXINT pThis)
{
int rc = VINF_SUCCESS;
PVDSCRIPTASTIDE pRetType = NULL;
PVDSCRIPTASTIDE pFnIde = NULL;
LogFlowFunc(("pThis=%p\n", pThis));
/* Put return type on the stack. */
rc = vdScriptParseIde(pThis, &pRetType);
if (RT_SUCCESS(rc))
{
/* Function name */
rc = vdScriptParseIde(pThis, &pFnIde);
if (RT_SUCCESS(rc))
{
if (vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, '('))
{
PVDSCRIPTASTFN pAstNodeFn = (PVDSCRIPTASTFN)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_FUNCTION);
if (pAstNodeFn)
{
pAstNodeFn->pFnIde = pFnIde;
pAstNodeFn->pRetType = pRetType;
RTListInit(&pAstNodeFn->ListArgs);
pFnIde = NULL;
pRetType = NULL;
/* Parse parameter list, create empty parameter list AST node and put it on the stack. */
while (!vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
PVDSCRIPTASTIDE pArgType = NULL;
PVDSCRIPTASTIDE pArgIde = NULL;
/* Parse two identifiers, first one is the type, second the name. */
rc = vdScriptParseIde(pThis, &pArgType);
if (RT_SUCCESS(rc))
rc = vdScriptParseIde(pThis, &pArgIde);
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTFNARG pAstNodeFnArg = (PVDSCRIPTASTFNARG)vdScriptAstNodeAlloc(VDSCRIPTASTCLASS_FUNCTIONARG);
if (pAstNodeFnArg)
{
pAstNodeFnArg->pArgIde = pArgIde;
pAstNodeFnArg->pType = pArgType;
RTListAppend(&pAstNodeFn->ListArgs, &pAstNodeFnArg->Core.ListNode);
pAstNodeFn->cArgs++;
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating function argument AST node\n");
}
if (RT_FAILURE(rc))
{
if (pArgType)
vdScriptAstNodeFree(&pArgType->Core);
if (pArgIde)
vdScriptAstNodeFree(&pArgIde->Core);
}
if ( !vdScriptTokenizerSkipIfIsPunctuatorEqual(pThis->pTokenizer, ',')
&& !vdScriptTokenizerIsPunctuatorEqual(pThis->pTokenizer, ')'))
{
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \",\" or \")\" got...\n");
break;
}
}
/* Parse the compound or statement block now. */
if (RT_SUCCESS(rc))
{
PVDSCRIPTASTSTMT pAstCompound = NULL;
rc = vdScriptParseCompoundStatement(pThis, &pAstCompound);
if (RT_SUCCESS(rc))
{
/*
* Link compound statement block to function AST node and add it to the
* list of functions.
*/
pAstNodeFn->pCompoundStmts = pAstCompound;
RTListAppend(&pThis->ListAst, &pAstNodeFn->Core.ListNode);
PVDSCRIPTFN pFn = (PVDSCRIPTFN)RTMemAllocZ(sizeof(VDSCRIPTFN));
if (pFn)
{
pFn->Core.pszString = pAstNodeFn->pFnIde->aszIde;
pFn->Core.cchString = strlen(pFn->Core.pszString);
pFn->fExternal = false;
pFn->Type.Internal.pAstFn = pAstNodeFn;
/** @todo: Parameters. */
RTStrSpaceInsert(&pThis->hStrSpaceFn, &pFn->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Out of memory allocating memory for function\n");
}
}
if (RT_FAILURE(rc))
vdScriptAstNodeFree(&pAstNodeFn->Core);
}
else
rc = vdScriptParserError(pThis, VERR_NO_MEMORY, RT_SRC_POS, "Parser: Out of memory allocating function AST node\n");
}
else
rc = vdScriptParserError(pThis, VERR_INVALID_PARAMETER, RT_SRC_POS, "Parser: Expected \"(\" got...\n");
}
}
if (RT_FAILURE(rc))
{
if (pRetType)
vdScriptAstNodeFree(&pRetType->Core);
if (pFnIde)
vdScriptAstNodeFree(&pFnIde->Core);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
/**
* Parses the script from the given tokenizer.
*
* @returns VBox status code.
* @param pThis The script context.
*/
static int vdScriptParseFromTokenizer(PVDSCRIPTCTXINT pThis)
{
int rc = VINF_SUCCESS;
LogFlowFunc(("pThis=%p\n", pThis));
/* This is a very very simple LL(1) parser, don't expect much from it for now :). */
while ( RT_SUCCESS(rc)
&& !vdScriptTokenizerIsEos(pThis->pTokenizer))
rc = vdScriptParseAddFnDef(pThis);
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
DECLHIDDEN(int) VDScriptCtxCreate(PVDSCRIPTCTX phScriptCtx)
{
int rc = VINF_SUCCESS;
LogFlowFunc(("phScriptCtx=%p\n", phScriptCtx));
AssertPtrReturn(phScriptCtx, VERR_INVALID_POINTER);
PVDSCRIPTCTXINT pThis = (PVDSCRIPTCTXINT)RTMemAllocZ(sizeof(VDSCRIPTCTXINT));
if (pThis)
{
pThis->hStrSpaceFn = NULL;
RTListInit(&pThis->ListAst);
*phScriptCtx = pThis;
}
else
rc = VINF_SUCCESS;
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
static int vdScriptCtxDestroyFnSpace(PRTSTRSPACECORE pStr, void *pvUser)
{
NOREF(pvUser);
/*
* Just free the whole structure, the AST for internal functions will be
* destroyed later.
*/
RTMemFree(pStr);
return VINF_SUCCESS;
}
DECLHIDDEN(void) VDScriptCtxDestroy(VDSCRIPTCTX hScriptCtx)
{
PVDSCRIPTCTXINT pThis = hScriptCtx;
AssertPtrReturnVoid(pThis);
LogFlowFunc(("hScriptCtx=%p\n", pThis));
RTStrSpaceDestroy(&pThis->hStrSpaceFn, vdScriptCtxDestroyFnSpace, NULL);
/* Go through list of function ASTs and destroy them. */
PVDSCRIPTASTCORE pIter;
PVDSCRIPTASTCORE pIterNext;
RTListForEachSafe(&pThis->ListAst, pIter, pIterNext, VDSCRIPTASTCORE, ListNode)
{
RTListNodeRemove(&pIter->ListNode);
RTListInit(&pIter->ListNode);
vdScriptAstNodeFree(pIter);
}
RTMemFree(pThis);
}
DECLHIDDEN(int) VDScriptCtxCallbacksRegister(VDSCRIPTCTX hScriptCtx, PCVDSCRIPTCALLBACK paCallbacks,
unsigned cCallbacks, void *pvUser)
{
int rc = VINF_SUCCESS;
PVDSCRIPTCTXINT pThis = hScriptCtx;
LogFlowFunc(("hScriptCtx=%p paCallbacks=%p cCallbacks=%u pvUser=%p\n",
pThis, paCallbacks, cCallbacks, pvUser));
AssertPtrReturn(pThis, VERR_INVALID_POINTER);
AssertPtrReturn(paCallbacks, VERR_INVALID_POINTER);
AssertReturn(cCallbacks > 0, VERR_INVALID_PARAMETER);
/** @todo: Unregister already registered callbacks in case of an error. */
do
{
PVDSCRIPTFN pFn = NULL;
if (RTStrSpaceGet(&pThis->hStrSpaceFn, paCallbacks->pszFnName))
{
rc = VERR_DUPLICATE;
break;
}
pFn = (PVDSCRIPTFN)RTMemAllocZ(RT_OFFSETOF(VDSCRIPTFN, aenmArgTypes[paCallbacks->cArgs]));
if (!pFn)
{
rc = VERR_NO_MEMORY;
break;
}
/** @todo: Validate argument and returns types. */
pFn->Core.pszString = paCallbacks->pszFnName;
pFn->Core.cchString = strlen(pFn->Core.pszString);
pFn->fExternal = true;
pFn->Type.External.pfnCallback = paCallbacks->pfnCallback;
pFn->Type.External.pvUser = pvUser;
pFn->enmTypeRetn = paCallbacks->enmTypeReturn;
pFn->cArgs = paCallbacks->cArgs;
for (unsigned i = 0; i < paCallbacks->cArgs; i++)
pFn->aenmArgTypes[i] = paCallbacks->paArgs[i];
RTStrSpaceInsert(&pThis->hStrSpaceFn, &pFn->Core);
cCallbacks--;
paCallbacks++;
}
while (cCallbacks);
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
DECLHIDDEN(int) VDScriptCtxLoadScript(VDSCRIPTCTX hScriptCtx, const char *pszScript)
{
int rc = VINF_SUCCESS;
PVDSCRIPTCTXINT pThis = hScriptCtx;
LogFlowFunc(("hScriptCtx=%p pszScript=%p\n", pThis, pszScript));
AssertPtrReturn(pThis, VERR_INVALID_POINTER);
AssertPtrReturn(pszScript, VERR_INVALID_POINTER);
PVDTOKENIZER pTokenizer = vdScriptTokenizerCreate(pszScript);
if (pTokenizer)
{
pThis->pTokenizer = pTokenizer;
rc = vdScriptParseFromTokenizer(pThis);
pThis->pTokenizer = NULL;
RTMemFree(pTokenizer);
}
LogFlowFunc(("returns rc=%Rrc\n", rc));
return rc;
}
DECLHIDDEN(int) VDScriptCtxCallFn(VDSCRIPTCTX hScriptCtx, const char *pszFnCall,
PVDSCRIPTARG paArgs, unsigned cArgs)
{
PVDSCRIPTCTXINT pThis = hScriptCtx;
VDSCRIPTARG Ret;
return vdScriptCtxInterprete(pThis, pszFnCall, paArgs, cArgs, &Ret);
}