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#!/usr/bin/env snobol4
# texaccents.sno
# version 1.0.1
# 2022.08.23 -- 2022.09.17
# guido.milanese@unicatt.it
# Transforms LaTeX accents to their UTF8 equivalents
# accepts both LaTeX and Bibtex codes:
# examples: \'a \'{a} {\"a} and even {\'{a}}
# tables of accents imported from:
# https://github.com/hayk314/LaTex-handler -- Author: Hayk Aleksanyan
# with my integrations, including ligatures as \ae{}
# requires snobol4: see http://www.regressive.org/snobol4/csnobol4/curr/
#################################################################
# MIT License - Copyright (c) 2022 Guido Milanese
# See file LICENSE in this package
#################################################################
******************************************************
* FUNCTIONS
******************************************************
*-- Function INITIALISE
*-- opens files, imports functions
define("initialise()")
:(initialise_end)
initialise
initialise_bg
* INCLUDE FILES
-include "delete.inc"
-include "host.inc"
-include "newline.inc"
-include "grepl.inc" ;* essential! calls repl internally
MAX = 8000000 ;* max size of input/output files = 8 megs
NL = newline()
HELP_MSG = "texaccents 1.0.1" NL
+ "Converts legacy (La)TeX accents and ligatures to Unicode" NL
+ "Usage: texaccents.sno INFILE OUTFILE" NL
+ "--help print this help, then exit" NL
+ "--version print version number, then exit" NL
+ "Report bugs to <guido.milanese@unicatt.it>" NL
+ "CTAN page of the package: <https://www.ctan.org/pkg/texaccents>"
VERS_MSG = "texaccents 1.0.1" NL NL
+ "Copyright (c) 2022 Guido Milanese" NL NL
+ "This is free software; see the source for copying conditions. There is NO" NL
+ "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." NL nl
+ "Written by Guido Milanese <guido.milanese@unicatt.it>"
#######################################################
# opens input / output files
#######################################################
* Defines and checks Input & Output
* help request -- exits. Both "--help" and "-help" are valid
((host(2,2) ? "-help") (Terminal = HELP_MSG)) :s(end)
* version request -- exits. Both "--version" and "-version" are valid
((host(2,2) ? "-version") (Terminal = VERS_MSG)) :s(end)
* Normal input-output with error messages.
* Error messages are used by MAIN if necessary
(~(infile = host(2,2)) ((Terminal = HELP_MSG) (ERROR_MSG = "Input error"))) :s(freturn)
(~(outfile = host(2,3)) ((Terminal = HELP_MSG) (ERROR_MSG = "Output error"))) :s(freturn)
INPUT('r_f',1,"B " MAX, Infile) :f(freturn)
Terminal = "Reading text from " Infile
OUTPUT('w_f',2,"B " MAX, Outfile) :f(freturn)
initialise_rt initialise = r_f :(return)
initialise_end
#####################################################################################
*-- Function NORMACC
*-- Changes TeX accents without curly brackets to the standard form
*-- \'a --> \'{a}
*-- and replaces ligatures such as \ae --> æ | \oe --> œ
*-- requires GREPL
#####################################################################################
define("normacc(Pass)")
P_shortacc = notany('{')
+ ((('\' any("'`" '"' "^=~.")) . Pre_shortacc)
+ (any(&ucase &lcase) . Letter_shortacc)) . V_shortacc
:(normacc_end)
normacc
normacc_bg Pass ? P_shortacc :f(normacc_lg)
Pass ? V_shortacc = Pre_shortacc '{' Letter_shortacc '}' :(normacc_bg)
normacc_lg Pass2 = grepl(Pass,
+ "\ae{} \oe{} \AE{} \OE{} \dh{} \DH{} \th{} \TH{} \o{} \O{} \l{} \L{} ",
+ "æ œ Æ Œ ð Ð þ Þ ø Ø ł Ł ")
Terminal = "Ligatures tranformed"
normacc_rt normacc = Pass2 :(return)
normacc_end
*
* The pattern to normalise accents -- as \'a -- is defined as follows:
* 1. there must be no '{' before backslash: otherwise the pattern would trap also
* BibTex codes such as {\'a}
* 2. find a backslash followed by any char of the list. Saved as "Pre_sortacc"
* 3. find the accented letter. Saved as Letter_shortacc
* 4. The whole structure is saved as V_shortacc
* The programme will save the whole structure and substitute it in the text with:
* Pre_shortacc (as \') + '{' + Letter_shortacc + '}'
* in this way the short form -- \'a -- is transformed to the canonical \'{a}
*
* Ligatures and special chars are simply replaced with GREPL.
#####################################################################################
*-- Function CLEANACC
*-- Substitutes plain letters to Unicode accents, using the sets provides by TRANSACC
*-- \'{a} will output á
#####################################################################################
define("cleanacc(Text,Acc1,Acc2)") :(cleanacc_end)
* Acc1 is the original LaTeX code e.g. \"{a}
* Acc2, at the time of calling the function, is e.g. \"{ä}
cleanacc
cleanacc_bg
* removes paretheses: \"{ä} --> \"ä
Acc2 = delete(Acc2,"{}")
* moves 2 chars and saves what remains, i.e. the letter
* \"ä --> ä
Acc2 ? len(2) (rem . Acc2)
* in text replaces e.g. \"{a} with ä
* the substitution is done ONCE for the whole text
Text = repl(Text,Acc1,Acc2)
Terminal = "Working on " Acc2
cleanacc_rt cleanacc = Text :(return)
cleanacc_end
#######################################################
*-- Function TRANSACC
*-- transforms LaTeX/Bibtex accents to Unicode
#######################################################
define("transacc(Pass)")
* Pass is the input text
*
* Accents used by Latex, e.g. \'{a} = acute accent over 'a'
Lat_acc =
+ any('"' "'" "`" 'H' '^' 'v' 'u' 'c' '.' 'd' 'k' '~' '=' 'b' 'r' )
+ . V_lat_acc
*
* The pattern says:
* '\' + Lat_acc OR ('{\' + Lat_acc + '{' OR nothing)
* any letter, saved as C_noacc + '}' + '}' OR nothing
* Lat_acc is already defined above and saved ad V_lat_acc
* Examples \'{a} -- {\'a} -- {\'{a}} (\'a was already "normalised")
P_lat_code =
+ (
+ (('\' Lat_acc '{') | ('{\' Lat_acc ('{' | '') ))
+ (any(&lcase &ucase) . C_noacc) '}' ('}' | '') ) . V_lat_code
:(transacc_end)
transacc
transacc_bg
latcode_bg V_lat_code = ;* cleans previous value
V_lat_code_2 = ;* cleans previous value
* Scans input text to locate the pattern
* if no other LaTeX accents, fails and returns to main
* if yes, goes to the section that transforms this accent.
* e.g. if the accent is umlaut, will jump to TR"
* After each transformation we have:
* 1. the original code, e.g. \"{a} or \"a or {\"a}
* 2. the transformed code, e.g. \"{ä} or \"ä or {\"ä}
* Each section calls CLEANCLODE
* CLEANCODE will remove all the {}\ and the LaTeX accent
* and substitute in the input text e.g. \"{ä} with ä
Pass ? P_lat_code :f(latcode_nd)
:($('TR' V_lat_acc))
TR" ;* umlaut
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c E e H h I i K k M m N n O o P p Q q S s T t U u V v W w X x Y y Z z ",
+ "Ä ä B̈ b̈ C̈ c̈ Ë ë Ḧ ḧ Ï ï K̈ k̈ M̈ m̈ N̈ n̈ Ö ö P̈ p̈ Q̈ q̈ S̈ s̈ T̈ ẗ Ü ü V̈ v̈ Ẅ ẅ Ẍ ẍ Ÿ ÿ Z̈ z̈ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR' ;* acute
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e F f G g H h I i J j K k L l M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z ",
+ "Á á B́ b́ Ć ć D́ d́ É é F́ f́ Ǵ ǵ H́ h́ Í í J́ ȷ́ Ḱ ḱ Ĺ ĺ Ḿ ḿ Ń ń Ó ó Ṕ ṕ Q́ q́ Ŕ ŕ Ś ś T́ t́ Ú ú V́ v́ Ẃ ẃ X́ x́ Ý ý Ź ź ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRH ;* double acute - \H{o} Hungarian
V_lat_code_2 = grepl(V_lat_code,
+ "A a E e I i M m O o U u ",
+ "A̋ a̋ E̋ e̋ I̋ i̋ M̋ m̋ Ő ő Ű ű ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR` ;* grave
V_lat_code_2 = grepl(V_lat_code,
+ "A a Æ æ E e H h I i K k M m N n O o R r S s T t U u V v W w X x Y y Z z ",
+ "À à Æ̀ æ̀ È è H̀ h̀ Ì ì K̀ k̀ M̀ m̀ Ǹ ǹ Ò ò R̀ r̀ S̀ s̀ T̀ t̀ Ù ù V̀ v̀ Ẁ ẁ X̀ x̀ Ỳ ỳ Z̀ z̀ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR^ ;* circumflex \^{o}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e G g H h I i J j K k L l M m N n O o R r S s T t U u V v W w X x Y y Z z ",
+ "Â â B̂ b̂ Ĉ ĉ D̂ d̂ Ê ê Ĝ ĝ Ĥ ĥ Î î Ĵ ĵ K̂ k̂ L̂ l̂ M̂ m̂ N̂ n̂ Ô ô R̂ r̂ Ŝ ŝ T̂ t̂ Û û V̂ v̂ Ŵ ŵ X̂ x̂ Ŷ ŷ Ẑ ẑ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRv ;* caron hraceck \v{s}
* For accents that are also normal letters
* we need to restore the accent to its original value
* This applies to: v u c d k b r
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e F f G g H h I i J j K k L l M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z ",
+ "Ǎ ǎ B̌ b̌ Č č Ď ď Ě ě F̌ f̌ Ǧ ǧ Ȟ ȟ Ǐ ǐ J̌ ǰ Ǩ ǩ Ľ ľ M̌ m̌ Ň ň Ǒ ǒ P̌ p̌ Q̌ q̌ Ř ř Š š Ť ť Ǔ ǔ V̌ v̌ W̌ w̌ X̌ x̌ Y̌ y̌ Ž ž ")
V_lat_code_2 = repl(V_lat_code_2,"\v̌","\v")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRu ;* breve \u{o}
V_lat_code_2 = grepl(V_lat_code,
+ "A a C c E e G g I i K k M m N n O o P p R r T t U u V v X x Y y ",
+ "Ă ă C̆ c̆ Ĕ ĕ Ğ ğ Ĭ ĭ K̆ k̆ M̆ m̆ N̆ n̆ Ŏ ŏ P̆ p̆ R̆ r̆ T̆ t̆ Ŭ ŭ V̆ v̆ X̆ x̆ Y̆ y̆ ")
V_lat_code_2 = repl(V_lat_code_2,"\ŭ","\u")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRc ;* cedilla \c{c}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e G g H h I i K k L l M m N n O o Q q R r S s T t U u X x Z z ",
+ "A̧ a̧ B̧ b̧ Ç ç Ḑ ḑ Ȩ ȩ Ģ ģ Ḩ ḩ I̧ i̧ Ķ ķ Ļ ļ M̧ m̧ Ņ ņ O̧ o̧ Q̧ q̧ Ŗ ŗ Ş ş Ţ ţ U̧ u̧ X̧ x̧ Z̧ z̧ ")
V_lat_code_2 = repl(V_lat_code_2,"\ç","\c")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR. ;* dot \.{o}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e F f G g H h I i K k L l M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z ",
+ "Ȧ ȧ Ḃ ḃ Ċ ċ Ḋ ḋ Ė ė Ḟ ḟ Ġ ġ Ḣ ḣ İ i̇̀ K̇ k̇ L̇ l̇ Ṁ ṁ Ṅ ṅ Ȯ ȯ Ṗ ṗ Q̇ q̇ Ṙ ṙ Ṡ ṡ Ṫ ṫ U̇ u̇ V̇ v̇ Ẇ ẇ Ẋ ẋ Ẏ ẏ Ż ż ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRd ;* dot under the letter \d{u}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e F f G g H h I i J j K k L l M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z ",
+ "Ạ ạ Ḅ ḅ C̣ c̣ Ḍ ḍ Ẹ ẹ F̣ f̣ G̣ g̣ Ḥ ḥ Ị ị J̣ j̣ Ḳ ḳ Ḷ ḷ Ṃ ṃ Ṇ ṇ Ọ ọ P̣ p̣ Q̣ q̣ Ṛ ṛ Ṣ ṣ Ṭ ṭ Ụ ụ Ṿ ṿ Ẉ ẉ X̣ x̣ Ỵ ỵ Ẓ ẓ ")
V_lat_code_2 = repl(V_lat_code_2,"\ḍ","\d")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRk ;* ogonek \k{a}
V_lat_code_2 = grepl(V_lat_code,
+ "A a E e I i O o U u Y y ",
+ "Ą ą Ę ę Į į Ǫ ǫ Ų ų Y̨ y̨ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR~ ;* tilde \~o
V_lat_code_2 = grepl(V_lat_code,
+ "A a E e I i N n O o U u V v Y y ",
+ "Ã ã Ẽ ẽ Ĩ ĩ Ñ ñ Õ õ Ũ ũ Ṽ ṽ Ỹ ỹ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TR= ;* macron \=a \={a}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e G g I i J j K k M m N n O o P p Q q R r S s T t U u V v W w X x Y y Z z ",
+ "Ā ā B̄ b̄ C̄ c̄ D̄ d̄ Ē ē Ḡ ḡ Ī ī J̄ j̄ K̄ k̄ M̄ m̄ N̄ n̄ Ō ō P̄ p̄ Q̄ q̄ R̄ r̄ S̄ s̄ T̄ t̄ Ū ū V̄ v̄ W̄ w̄ X̄ x̄ Ȳ ȳ Z̄ z̄ ")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRb ;* bar under the letter \b{a}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e G g H h I i J j K k L l M m N n O o P p R r S s T t U u X x Y y Z z ",
+ "A̱ a̱ Ḇ ḇ C̱ c̱ Ḏ ḏ E̱ e̱ G̱ g̱ H̱ ẖ I̱ i̱ J̱ j̱ Ḵ ḵ Ḻ ḻ M̱ m̱ Ṉ ṉ O̱ o̱ P̱ p̱ Ṟ ṟ S̱ s̱ Ṯ ṯ U̱ u̱ X̱ x̱ Y̱ y̱ Ẕ ẕ ")
V_lat_code_2 = repl(V_lat_code_2,"\ḇ","\b")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
TRr ;* ring over the letter \r{a}
V_lat_code_2 = grepl(V_lat_code,
+ "A a B b C c D d E e F f G g H h I i J j K k L l M m N n O o P p Q q r R S s U u V v W w X x Y y Z z ",
+ "Å å B̊ b̊ C̊ c̊ D̊ d̊ E̊ e̊ F̊ f̊ G̊ g̊ H̊ h̊ I̊ i̊ J̊ j̊ K̊ k̊ L̊ l̊ M̊ m̊ N̊ n̊ O̊ o̊ P̊ p̊ Q̊ q̊ r̊ R̊ S̊ s̊ Ů ů V̊ v̊ W̊ ẘ X̊ x̊ Y̊ ẙ Z̊ z̊ ")
V_lat_code_2 = repl(V_lat_code_2,"\r̊","\r")
Pass = cleanacc(Pass,V_lat_code,V_lat_code_2) :(latcode_bg)
latcode_nd
transacc = Pass :(return)
transacc_end
#######################################################
# MAIN
#######################################################
(~(texfile = initialise()) (terminal = "Could not start programme - " ERROR_MSG)) :s(end)
Texfile = normacc(Texfile)
(((w_f = transacc(texfile)) (Terminal = "Done. File " Outfile " written")),
+ (Terminal = "Conversion failed"))
end
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