{- |

> HetCATS/Common/LaTeX_funs.hs

> $Id$

> Author: Klaus L�ttich

> Year: 2002

Functions to calculate the length of a given word as it would be

printed with LaTeX according to one of four categories of words

useful for CASL:

* keywords -- all the things that were printed in boldface

* structid -- all the names used in the structured context of CASL

* annotation -- all the comments and annotations of CASL in a smaller font

* axiom -- identifiers in math mode for CASL Basic specs

TODO:

- itCorrection should be based on a map of character pairs to

corrections and not on one fixed value for every pair

-}

module Common.LaTeX_funs (

space_latex_width,

calc_line_length,

-- calc_word_width,

-- Word_type(..),

keyword_width, structid_width, axiom_width,

annotation_width, annotationbf_width, comment_width,

normal_width,

escape_latex,

(<\+>),

(<~>),

latex_macro,

comma_latex,

semi_latex,

colon_latex,

equals_latex,

space_latex,

braces_latex,

parens_latex,

brackets_latex,

quotes_latex,

nest_latex,

hang_latex,

sep_latex,

fsep_latex,

initial_keyword_latex,

casl_keyword_latex,

casl_annotation_latex,

casl_annotationbf_latex,

casl_axiom_latex,

casl_comment_latex,

casl_structid_latex,

casl_normal_latex,

hc_sty_keyword,

hc_sty_small_keyword,

hc_sty_plain_keyword,

hc_sty_hetcasl_keyword,

hc_sty_comment,

hc_sty_annotation,

hc_sty_axiom,

hc_sty_structid,

hc_sty_id

) where

import Common.Lib.Map hiding (isEmpty, empty, map)

import Data.Char

import Data.Maybe (isJust,fromJust)

import Data.List (isPrefixOf)

import Prelude hiding (lookup)

-- for the debug hack

import Debug.Trace

import Common.LaTeX_maps

import Common.Lib.Pretty

infixl 6 <\+>, <~>

space_latex_width :: Int

space_latex_width = normal_width " "

{- functions for calculating an interger value according to a given

length in LaTeX units

Units per mm found in: Karsten G�nther, "Einf�hrung in LaTeX2e" (p.376)

-}

calc_line_length :: String -> Int

calc_line_length s =

let (r_unit,r_number) =

(\(x,y) -> (reverse x,reverse y)) $ span isAlpha $ reverse s

unit = case r_unit of

"mm" -> 1

"cm" -> 10

"pt" -> 0.351

"in" -> 25.4

u -> error ( "unknown or unsupported LaTeX unit: " ++ u )

len :: Double

len = read $ map (\c -> case c of ',' -> '.';_ -> c) r_number

in truncate (len * unit * 1000)

-- a hack to have some debug prints

condTrace :: String -> a -> a

condTrace s v = if debugFlag then trace s v else v

where debugFlag = True

{- functions to calculate a word-width in integer with a given word

type or purpose

-}

data Word_type = Keyword | StructId | Normal

| Comment | Annotation | AnnotationBold

| Axiom

deriving (Show,Eq)

calc_word_width :: Word_type -> String -> Int

calc_word_width wt s =

case lookup s wFM of

Just l -> l

Nothing -> sum_char_width_deb ( showString "In map \""

. showsPrec 0 wt

. showString "\" \'") wFM k_wFM s

- correction

where (wFM,k_wFM) = case wt of

Keyword -> (keyword_map,key_keyword_map)

StructId -> (structid_map,key_structid_map)

Comment -> (comment_map,key_comment_map)

Annotation -> (annotation_map,key_annotation_map)

AnnotationBold -> (annotationbf_map,

key_annotationbf_map)

Axiom -> (axiom_map,key_axiom_map)

Normal -> (normal_map,key_normal_map)

correction = case wt of

Axiom -> itCorrection s

_ -> 0

itCorrection :: String -> Int

itCorrection [] = 0

itCorrection s

| length s < 2 = 0

| otherwise = itCorrection' 0 s

where itCorrection' :: Int -> String -> Int

itCorrection' _ [] = error "itCorrection' applied to empty List"

itCorrection' r ys@(y1:[y2])

| not (isAlphaNum y1) = r

| not (isAlphaNum y2) = r

| otherwise = r + lookupCorrection ys

itCorrection' r (y1:(ys@(y2:_)))

| not (isAlphaNum y1) = itCorrection' r ys

| otherwise =

itCorrection'

(r + lookupCorrection (y1:y2:[]))

ys

itCorrection' _ _ = error ("itCorrection' doesn't work with " ++ s)

lookupCorrection _pc = def_cor

-- lookupWithDefaultFM correction_map def_cor pc

-- TODO: Build a nice correction map

def_cor = 610

sum_char_width_deb :: (String -> String) -- only used for an hackie debug thing

-> Map String Int

-> Map Char [String] -> String -> Int

sum_char_width_deb pref_fun cFM key_cFM s = sum_char_width' s 0

where sum_char_width' [] r = r

sum_char_width' [c] r

| c == ' ' = r + lookupWithDefault_cFM "~"

| otherwise = r + lookupWithDefault_cFM (c:[])

sum_char_width' full@(c1:rest@(c2:cs)) r

| isLigature (c1:c2:[]) = case lookup (c1:c2:[]) cFM of

Just l -> sum_char_width' cs (r+l)

Nothing -> sum_char_width' rest nl

| (c1:c2:[]) == "\\ " =

sum_char_width' cs (r + lookupWithDefault_cFM "~")

| c1 == ' ' =

sum_char_width' rest (r + lookupWithDefault_cFM "~")

| otherwise = case prefixIsKey full key_cFM of

Just key -> sum_char_width'

(drop (length key) full)

(r + (fromJust $ lookup key cFM))

Nothing -> sum_char_width' rest nl

where nl = r + lookupWithDefault_cFM (c1:[])

lookupWithDefault_cFM s' = case lookup s' cFM of

Nothing -> condTrace

((pref_fun

. showString s'

. showString "\' of \""

. showString s)

"\" not found!")

2200

Just w -> w

prefixIsKey :: String -> Map Char [String] -> Maybe String

prefixIsKey [] _ = Nothing

prefixIsKey ls@(c:_) key_cFM = case lookup c key_cFM of

Just ws -> firstJust $ map testPrefix ws

Nothing -> Nothing

where testPrefix s = if ((flip isPrefixOf) ls) s

then Just s

else Nothing

firstJust [] = Nothing

firstJust (ms:mss) = if isJust ms then ms else firstJust mss

isLigature :: String -> Bool

isLigature s

| (length s) /= 2 = False

| otherwise = findWithDefault False s ligatures

keyword_width, structid_width, axiom_width, annotationbf_width,

annotation_width, comment_width, normal_width

:: String -> Int

annotation_width = calc_word_width Annotation

annotationbf_width = calc_word_width AnnotationBold

keyword_width = calc_word_width Keyword

structid_width = calc_word_width StructId

axiom_width = calc_word_width Axiom

comment_width = calc_word_width Comment

normal_width = calc_word_width Normal

-- |

-- LaTeX version of <+> with enough space counted. It's choosen the

-- space between keywords which is nearly the average width of a

-- space.

(<\+>) :: Doc -> Doc -> Doc

-- TODO: did not work correctly !!!

d1 <\+> d2 = if isEmpty d1

then (if isEmpty d2

then empty

else d2)

else (if isEmpty d2

then d1

else

d1 <> casl_normal_latex " " <> d2)

(<~>) :: Doc -> Doc -> Doc

d1 <~> d2 = d1 <> casl_normal_latex "~" <> d2

-- |

-- latex_macro creates a document ('Doc') containing String

-- that has a zero width.

-- So it can be used for LaTeX-macros not needing any space, i.e.

-- @\textit{@ or @}@

latex_macro :: String -> Doc

latex_macro = sp_text 0

{- an alternative implementation of

latex_text with bad counts for letters etc. :

case sp_length s 0 of {sl -> sp_text sl s}

where

sp_length :: String -> Int -> Int

sp_length "" a = a

sp_length (x:xs) a

| x == '\\' = let (c,rest) = spanLaMacro xs

in sp_length rest (a+c)

| x == '{' = sp_length xs a

| x == '}' = sp_length xs a

| otherwise = sp_length xs (a+1)

where spanLaMacro :: String -> (Int, String)

spanLaMacro "" = (1,"") -- lambda

spanLaMacro (x:xs)

| x == ' ' = (1,xs) -- an explicit space

| x == '{' = (1,xs)

| x == '}' = (1,xs)

| x == '_' = (1,xs)

| isAlpha x = let (makro,rest) =

span isAlpha xs

in (0,rest)

| otherwise = (0,x:xs)

-- error $ "spanLaMacro: strange " ++

-- take 5 (x:xs)

-}

comma_latex, semi_latex, space_latex,equals_latex,colon_latex :: Doc

comma_latex = let s = "," in sp_text (normal_width s) s

semi_latex = let s = ";" in sp_text (normal_width s) s

colon_latex = let s = ":" in sp_text (normal_width s) s

space_latex = let s = " " in sp_text (normal_width s) s

equals_latex = hc_sty_axiom "="

braces_latex, parens_latex, brackets_latex, quotes_latex :: Doc -> Doc

braces_latex d = casl_normal_latex "\\{"<>d<>casl_normal_latex "\\}"

parens_latex d = casl_normal_latex "("<>d<>casl_normal_latex ")"

brackets_latex d = casl_normal_latex "["<>d<>casl_normal_latex "]"

quotes_latex d = q <> d <> q

where q = casl_normal_latex "{\\tt{}\\textquotedblright}"

-- nest and hang that do the obvious thing except that they use

-- multiple spaces for indentation

nest_latex :: Int -> Doc -> Doc

nest_latex k = nest (k * space_latex_width)

hang_latex :: Doc -> Int -> Doc -> Doc

hang_latex d1 n d2 = sep_latex [d1, nest_latex n d2]

sep_latex :: [Doc] -> Doc

sep_latex = cat . (cond_punctuate (casl_normal_latex " "))

fsep_latex :: [Doc] -> Doc

fsep_latex = fcat . (cond_punctuate (casl_normal_latex " "))

initial_keyword_latex :: String -> String -> Doc

initial_keyword_latex fs kw =

let fs_w = keyword_width fs

kw_w = keyword_width kw

in if kw_w <= fs_w then

sp_text fs_w kw

else

sp_text kw_w kw

casl_keyword_latex, casl_annotation_latex, casl_annotationbf_latex,

casl_axiom_latex,

casl_comment_latex, casl_structid_latex,

casl_normal_latex :: String -> Doc

casl_keyword_latex s = sp_text (keyword_width s) s

casl_annotation_latex s = sp_text (annotation_width s) s

casl_annotationbf_latex s = sp_text (annotationbf_width s) s

casl_comment_latex s = sp_text (comment_width s) s

casl_structid_latex s = sp_text (structid_width s) s

casl_axiom_latex s = sp_text (axiom_width s) s

casl_normal_latex s = sp_text (normal_width s) s

hc_sty_keyword :: Maybe String -> String -> Doc

hc_sty_keyword mfkw kw =

latex_macro "\\KW"<>fkw_doc<>latex_macro "{"<>kw_doc<> latex_macro "}"

where (fkw_doc,kw_doc) =

case mfkw of

Just fkw -> (latex_macro "["<>latex_macro fkw<>latex_macro "]",

initial_keyword_latex fkw kw)

Nothing -> (empty,casl_keyword_latex kw)

hc_sty_plain_keyword :: String -> Doc

hc_sty_plain_keyword = hc_sty_keyword Nothing

hc_sty_hetcasl_keyword :: String -> Doc

hc_sty_hetcasl_keyword = hc_sty_keyword (Just "view")

hc_sty_small_keyword :: String -> Doc

hc_sty_small_keyword kw =

latex_macro "\\KW{" <> casl_annotationbf_latex kw <> latex_macro "}"

hc_sty_comment, hc_sty_annotation :: Doc -> Doc

hc_sty_comment cm = latex_macro "{\\small{}" <> cm <> latex_macro "}"

hc_sty_annotation = hc_sty_comment

hc_sty_axiom, hc_sty_structid, hc_sty_id :: String -> Doc

hc_sty_structid sid = latex_macro "\\SId{"<>sid_doc<>latex_macro "}"

where sid_doc = casl_structid_latex (escape_latex sid)

hc_sty_id i = latex_macro "\\Id{"<>id_doc<>latex_macro "}"

where id_doc = casl_axiom_latex i

hc_sty_axiom ax = latex_macro "\\Ax{"<>ax_doc<>latex_macro "}"

where ax_doc = casl_axiom_latex ax

cond_punctuate :: Doc -> [Doc] -> [Doc]

cond_punctuate _p [] = []

cond_punctuate p (doc:docs) = go doc docs

where go d [] = [d]

go d (e:es) = cond_predicate : go e es

where cond_predicate = if isEmpty d then d else d<>p

-- moved from PPUtils (used for String instance of PrettyPrint and

-- various other functions that print Strings with special stuff

-- inside)

escape_latex :: String -> String

escape_latex "" = ""

escape_latex (x:xs)

| x == '\\' = "\\textbackslash" ++ '{':'}':escape_latex xs

| x == '"' = -- something to prevent german.sty from interpreting '"'

case xs of

[] -> default_quotes []

y:ys | isAlphaNum y -> '`':'`':y:escape_latex ys

| isSpace y -> default_quotes (y:escape_latex ys)

| otherwise -> default_quotes (escape_latex xs)

| x `elem` "_%$&{}#" = '\\':x:escape_latex xs

| x `elem` "~^" = '\\':x:("{}"++escape_latex xs)

| otherwise = x:escape_latex xs

where default_quotes = ('\'':) . ('\'':)