{- |

Module : $Header$

Description : auxiliary functions for LaTeX printing

Copyright : (c) Klaus Luettich, Uni Bremen 2002-2006

License : GPLv2 or higher, see LICENSE.txt

Maintainer : Christian.Maeder@dfki.de

Stability : provisional

Portability : portable

Auxiliary functions for LaTeX printing

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

-}

module Common.LaTeX_funs

( calcLineLen

, axiom_width

, latex_macro

, flushright

, casl_comment_latex

, casl_normal_latex

, hc_sty_small_keyword

, hc_sty_plain_keyword

, hc_sty_casl_keyword

, hc_sty_axiom

, hc_sty_structid

, hc_sty_structid_indexed

, hc_sty_id

, startTab, endTab, setTab

, setTabWSp

, startAnno

, endAnno

, escapeSpecial

, escapeLatex

) where

import qualified Data.Map as Map

import Data.Char

import Data.List (isPrefixOf)

import Common.LaTeX_maps

import Common.Lib.Pretty as Pretty

import Common.Parsec

import Text.ParserCombinators.Parsec as Parsec

-- | a constant String for starting a LaTeX indentation with tab stop

startTab :: String

startTab = "\\@begT@"

-- | a constant String for releasing a LaTeX indentation with tab stop

endTab :: String

endTab = "\\@endT@"

-- | a constant String to set a tab stop and enable it

setTab :: String

setTab = "\\="

-- | a constant String indicating the start of a space based indentation

setTabWSp :: String

setTabWSp = "\\@setTS@{"

{- | functions for calculating an integer value according to a given

length in LaTeX points.

-}

calcLineLen :: Int -> Int

calcLineLen len = scaleDown $ len * 351

-- Units per mm found in: Karsten Guenther, "Einfuehrung in LaTeX2e" (p.376)

scaleDown :: Int -> Int

scaleDown = (`div` 44) . (+ 15)

{- 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 = scaleDown $ calc_word_widthAux wt s

calc_word_widthAux :: Word_type -> String -> Int

calc_word_widthAux wt s = Map.findWithDefault

(sum_char_width_deb (showString "In map \"" . shows wt . showString "\" \'")

wFM k_wFM s - correction) s wFM

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 || head s == '\\' = 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 str = Map.findWithDefault def_cor str

italiccorrection_map

def_cor = 610

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

-> Map.Map String Int

-> Map.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 = r + case c of

'}' -> 0

'{' -> 0

' ' -> lookupWithDefault_cFM "~"

_ -> lookupWithDefault_cFM [c]

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

| isLigature [c1, c2] = case Map.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 + (cFM Map.! key)

Nothing -> if c1 == '\\' then

sum_char_width'

(dropWhile isAlpha rest)

$ r + lookupWithDefault_cFM "~"

else sum_char_width' rest nl

where nl = r + lookupWithDefault_cFM [c1]

lookupWithDefault_cFM s' = Map.findWithDefault 2200 s' cFM

-- 2200 may not be optimal

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

prefixIsKey [] _ = Nothing

prefixIsKey ls@(c : _) key_cFM = case filter (`isPrefixOf` ls)

$ Map.findWithDefault [] c key_cFM of

[] -> Nothing

s : _ -> Just s

isLigature :: String -> Bool

isLigature s = case s of

[_, _] -> Map.findWithDefault False s ligatures

_ -> False

keyword_width, structid_width, axiom_width, annotationbf_width,

comment_width, normal_width :: String -> Int

annotationbf_width = calc_word_width AnnotationBold

keyword_width = calc_word_width Keyword

structid_width = calc_word_width StructId

comment_width = calc_word_width Comment

normal_width = calc_word_width Normal

axiom_width = sum . map (calc_word_width Axiom) . parseAxiomString

{- |

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 = sizedText 0

casl_keyword_latex, casl_annotationbf_latex,

casl_axiom_latex,

casl_comment_latex, casl_structid_latex,

casl_normal_latex :: String -> Doc

casl_annotationbf_latex s = sizedText (annotationbf_width s) s

casl_structid_latex s = sizedText (structid_width s) s

casl_comment_latex s = sizedText (comment_width s) s

casl_keyword_latex s = sizedText (keyword_width s) s

casl_normal_latex s = sizedText (normal_width s) s

casl_axiom_latex s = sizedText (axiom_width s) s

-- | sort, op, pred, type and its plurals

hc_sty_casl_keyword :: String -> Doc

hc_sty_casl_keyword str =

sizedText (keyword_width "preds") $ '\\' : map toUpper str

hc_sty_plain_keyword :: String -> Doc

hc_sty_plain_keyword kw =

latex_macro "\\KW{" <> casl_keyword_latex (escapeSpecial kw)

<> latex_macro "}"

hc_sty_small_keyword :: String -> Doc

hc_sty_small_keyword kw =

latex_macro "\\KW{" <> casl_annotationbf_latex (escapeSpecial kw)

<> latex_macro "}"

hc_sty_axiom, hc_sty_structid, hc_sty_id, hc_sty_structid_indexed

:: String -> Doc

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

where sid_doc = casl_structid_latex (escapeSpecial sid)

hc_sty_structid_indexed sid =

latex_macro "\\SIdIndex{" <> sid_doc <> latex_macro "}"

where sid_doc = casl_structid_latex (escapeSpecial 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

-- | flush argument doc to the right

flushright :: Doc -> Doc

flushright = (latex_macro "\\`" <>)

-- | a constant String for the start of annotations

startAnno :: String

startAnno = "{\\small{}"

-- | a constant string ending an annotation

endAnno :: String

endAnno = "%@%small@}"

escapeSpecial :: String -> String

escapeSpecial = concatMap $ \ c -> if elem c "_%$&{}#" then '\\' : [c] else

Map.findWithDefault [c] c escapeMap

{- http://dhelta.net/hprojects/HaTeX/code/HaTeX-3.1.0/Text/LaTeX/Base/Syntax.hs

changes _ to \_{} -}

escapeLatex :: String -> String

escapeLatex = concatMap $ \ c -> case () of

()

| elem c "_%$&{}#" -> "\\Ax{\\" ++ c : "}"

| elem c "<|>=-!()[]?:;,./*+@" -> "\\Ax{" ++ c : "}"

| otherwise -> Map.findWithDefault [c] c escapeMap

parseAxiomString :: String -> [String]

parseAxiomString s = case parse axiomString "" s of

Left _ -> [s]

Right l -> l

axiomString :: CharParser st [String]

axiomString = do

l <- many parseAtom

eof

return $ concat l

parseAtom :: CharParser st [String]

parseAtom = fmap concat

((tryString "\\Ax{" <|> tryString "\\Id{" <|> string "{")

>> many parseAtom << Parsec.char '}')

<|> do

b <- Parsec.char '\\'

s <- fmap (: []) (satisfy (\ c -> isSpace c

|| elem c "_~^|\'\",;:.`\\{}[]%$&#()"))

<|> many1 letter

return [b : s]

<|> do

s <- many1 letter

return [s]

<|> do

c <- satisfy (/= '}')

return [[c]]

-- | a character map for special latex characters

escapeMap :: Map.Map Char String

escapeMap = Map.fromList

[('\\', "\\Ax{\\setminus}"),

('^', "\\Ax{\\hat{\\ }}"),

('"', "''"),

('~', "\\Ax{\\sim}"),

('\160', "\\ "),

('\162', "\\Id{\\textcent}"),

('\164', "\\Id{\\textcurrency}"),

('\165', "\\Id{\\textyen}"),

('\166', "\\Id{\\textbrokenbar}"),

('\170', "\\Id{\\textordfeminine}"),

('\171', "\\Id{\\guillemotleft}"),

('\172', "\\Ax{\\neg}"),

('\173', "-"),

('\174', "\\Id{\\textregistered}"),

('\175', "\\Ax{\\bar{\\ }}"),

('\176', "\\Id{\\textdegree}"),

('\177', "\\Ax{\\pm}"),

('\178', "\\Ax{^2}"),

('\179', "\\Ax{^3}"),

('\180', "\\Ax{\\acute{\\ }}"),

('\181', "\\Ax{\\mu}"),

('\185', "\\Ax{^1}"),

('\186', "\\Id{\\textordmasculine}"),

('\187', "\\Id{\\guillemotright}"),

('\192', "\\Ax{\\grave{A}}"),

('\193', "\\Ax{\\acute{A}}"),

('\200', "\\Ax{\\grave{E}}"),

('\201', "\\Ax{\\acute{E}}"),

('\204', "\\Ax{\\grave{I}}"),

('\205', "\\Ax{\\acute{I}}"),

('\208', "\\Id{\\DH}"),

('\210', "\\Ax{\\grave{O}}"),

('\211', "\\Ax{\\acute{O}}"),

('\215', "\\Ax{\\times}"),

('\217', "\\Ax{\\grave{U}}"),

('\218', "\\Ax{\\acute{U}}"),

('\221', "\\Ax{\\acute{Y}}"),

('\222', "\\Id{\\TH}"),

('\224', "\\Ax{\\grave{a}}"),

('\225', "\\Ax{\\acute{a}}"),

('\232', "\\Ax{\\grave{e}}"),

('\233', "\\Ax{\\acute{e}}"),

('\236', "\\Ax{\\grave{\\Id{\\i}}}"),

('\237', "\\Ax{\\acute{\\Id{\\i}}}"),

('\240', "\\Id{\\dh}"),

('\242', "\\Ax{\\grave{o}}"),

('\243', "\\Ax{\\acute{o}}"),

('\247', "\\Ax{\\div}"),

('\249', "\\Ax{\\grave{u}}"),

('\250', "\\Ax{\\acute{u}}"),

('\253', "\\Ax{\\acute{y}}"),

('\254', "\\Id{\\th}")]

{- acute and grave characters don't work in a tabbing environment

\textcent upto textbrokenbar requires \usepackage{textcomp}

whereas \guillemot, eth, and thorn \usepackage[T1]{fontenc}

-}