#! /usr/bin/env perl

# Convert fdsymbol.sty to a faked version that does not require
# the definition of any additional math alphabets
#
# By Scott Pakin <scott.clsl@pakin.org>

use POSIX;
use warnings;
use strict;

# Define a subroutine to construct text and display delimiters.
sub output_delimiter ($$$$$$$)
{
    my ($name, $smclass, $small, $top, $mid, $bot, $rep) = @_;
    if ($smclass eq "fake") {
	printf '\DeclareRobustCommand{\FDSYMt%s}{{\usefont{U}{FdSymbolF}{m}{n}\raisebox{0pt}{\CLSLfaketdelim{%d}{%d}{%d}}}}%s', $name, $top, $mid, $bot, "\n";
    }
    else {
	printf '\DeclareRobustCommand{\FDSYMt%s}{{\usefont{U}{FdSymbol%s}{m}{n}\char%d}}%s', $name, $smclass, $small, "\n";
    }
    printf '\DeclareRobustCommand{\FDSYMd%s}{{\usefont{U}{FdSymbolF}{m}{n}\raisebox{20pt}{\CLSLfakeddelim{%d}{%d}{%d}{%d}}}}%s', $name, $top, $mid, $bot, $rep, "\n";
}

# Define a subroutine to construct an extensible accent.
sub output_accent ($$$$$)
{
    my ($name, $smraise, $smchar, $lgraise, $lgchar) = @_;
    printf '\DeclareRobustCommand{\FDSYM%s}[1]{\CLSLfakewidetopaccent{#1}{%dpt}{%d}{%dpt}{%d}{{U}{FdSymbolE}{m}{n}}}%s', $name, $smraise, $smchar, $lgraise, $lgchar, "\n";
}

# Output some header boilerplate.
print "\%" x 43, "\n";
print "\% This is a generated file.  DO NOT EDIT. \%\n";
print "\%" x 43, "\n";
print "\n";

# Read and process fdsymbol.sty.
my $seen_symfont = 0;          # 1=we've seen a \DeclareSymbolFont; 1=we haven't
my $slot = 0;                  # Current character slot
my $lastsym;                   # Name of last symbol declared
my $ignored_conditional = 0;   # 1=on false branch of conditional; 0=true branch or not in conditional
while (my $oneline = <>) {
    chomp $oneline;

    # Output some package header information.
    if ($oneline =~ /NeedsTeXFormat/o) {
        print $oneline, "\n";
        next;
    }
    if ($oneline =~ /ProvidesPackage/o) {
        $oneline =~ s/fdsymbol/fakefdsymbol/;
        $oneline =~ s/FdSymbol/faked FdSymbol/;
        print $oneline, "\n\n";
        next;
    }

    # Handle conditionals.
    if ($oneline =~ /^\\fi\s*$/) {
        $ignored_conditional = 0;
        next;
    }
    if ($oneline =~ /^\\else\s*$/) {
        $ignored_conditional = 1 - $ignored_conditional;
        next;
    }
    if ($oneline =~ /^\\iffdsy\@sfop/o) {
        $ignored_conditional = 1;    # Ignore sans-serif operators.
        next;
    }
    if ($oneline =~ /^\\iffdsy\@largedelims/o) {
        $ignored_conditional = 1;    # Don't use large delimiters.
        next;
    }
    next if $ignored_conditional;

    # Declare fonts.
    if ($oneline =~ /DeclareFontFamily\{U\}\{(FdSymbol\w+)\}\{\}/o) {
        print $oneline, "\n";
        print "\\DeclareFontShape{U}{$1}{m}{n}{<-> $1-Book}{}\n";
        print "\\DeclareFontShape{U}{$1}{b}{n}{<-> $1-Medium}{}\n";
        next;
    }
    if ($oneline =~ /DeclareSymbolFont\{(.*?)s\}\{U\}(\{FdSymbol\w+\}\{m\}\{n\})/o) {
        if (!$seen_symfont) {
            print "\n";
            $seen_symfont = 1;
        }
        print "\\newcommand*{\\FDSYM$1char}[1]{{\\usefont{U}$2\\char#1}}\n";
        next;
    }

    # Define all basic symbol characters.
    if ($oneline =~ /\\fdsy\@setslot\{(\d+)\}/o) {
        $slot = $1;
        print "\n";
        next;
    }
    if ($oneline =~ /\\fdsy\@DeclareSymbol\{\\([A-Za-z\@]+)\}\{(\w+)s\}/o) {
        $lastsym = $1;
        print "\\DeclareRobustCommand{\\FDSYM$lastsym}{\\FDSYM$2char{$slot}}\n";
        $slot++;
        next;
    }
    if ($oneline =~ /\\fdsy\@DeclareAlias\{\\([A-Za-z\@]+)\}\{\w+s\}/o) {
        print "\\let\\FDSYM$1=\\FDSYM$lastsym\n";
        next;
    }
    if ($oneline =~ /\\let\\([A-Za-z\@]+)=?\\([A-Za-z\@]+)/o && $2 ne "undefined") {
        print "\\let\\FDSYM$1=\\FDSYM$2\n";
        next;
    }

    # Define most delimiters.
    if ($oneline =~ /\\fdsy\@Declare(?:Open|Close|Delimiter)\{\\([A-Za-z\@]+)\}.*\{delimiters\}\{\"(.*?)\}/o) {
        my $sym = $1;
        my $smallchar = hex($2);
        my $bigchar = $smallchar + 5;

	# Include a special case for vertical-line delimiters.
	if ($sym =~ /^[rl]?(V?v?)ert$/) {
	    my $segchar = $1 eq "Vv" ? $smallchar + 2 : $smallchar - 1;
	    output_delimiter $sym, "F", $smallchar, $segchar, $segchar, $segchar, $segchar;
	    next;
	}

	# Include a special case for left and right groups.
	if ($sym =~ /^[rl]group$/) {
	    output_delimiter $sym, "fake", -1, $smallchar, 132, $smallchar+2, 132;
	    next;
	}

	# Ignore moustaches for now (handled below).
	next if $sym =~ /^[lr]moustache$/;

	# Handle all of the normal delimiters.
        print "\\DeclareRobustCommand{\\FDSYMt$sym}{{\\usefont{U}{FdSymbolF}{m}{n}\\char$smallchar}}\n";
        print "\\DeclareRobustCommand{\\FDSYMd$sym}{{\\usefont{U}{FdSymbolF}{m}{n}\\char$bigchar}}\n";
        next;
    }

    # Define various math symbols.
    if ($oneline =~ /\\DeclareMathSymbol\{\\([A-Za-z\@]+)\}.*\{(\w+)s\}\{\"(\w+)\}/o) {
	my $sym = $1;
	my $cat = $2;
        my $char = hex $3;
	print "\\DeclareRobustCommand{\\FDSYM$sym}{\\FDSYM${cat}char{$char}}\n";
    }

    # Define all of our accents.
    if ($oneline =~ /\\DeclareMathAccent\{\\([A-Za-z\@]+)\}.*\{\"(\w+)\}/o) {
	my $sym = $1;
        my $smallacc = hex($2);
	my $bigacc = $smallacc;
	$bigacc += 2 if substr($sym, 0, 4) eq "wide";
	output_accent $sym, 0, $smallacc, 2, $bigacc;
    }
}

# Output a few special-case delimiters.
output_delimiter "uparrow",     "C",  1, 198, 200, 200, 200;
output_delimiter "downarrow",   "C",  3, 200, 200, 199, 200;
output_delimiter "Uparrow",     "C",  9, 201, 203, 203, 203;
output_delimiter "Downarrow",   "C", 11, 203, 203, 202, 203;
output_delimiter "updownarrow", "C", 17, 198, 200, 199, 200;
output_delimiter "Updownarrow", "C", 21, 201, 203, 202, 203;
output_delimiter "lmoustache",  "fake", -1, 126, 132, 129, 132;
output_delimiter "rmoustache",  "fake", -1, 127, 132, 128, 132;

# Output various other symbol definitions.
print <<'FDSYM_COMPOSITIONS'
\DeclareRobustCommand{\FDSYMdotcong}{\mathrel{\dot{\text{\FDSYMcong}}}}
\DeclareRobustCommand{\FDSYMthicksim}{{\usefont{U}{FdSymbolB}{b}{n}\char2}}
\DeclareRobustCommand{\FDSYMthickapprox}{{\usefont{U}{FdSymbolB}{b}{n}\char4}}
\DeclareRobustCommand{\FDSYMhbar}{\CLSLfakewidetopaccent{h}{1.8pt}{133}{2pt}{133}{{U}{FdSymbolE}{m}{n}}}
\DeclareRobustCommand{\FDSYMhslash}{\CLSLfakewidetopaccent{h}{1.8pt}{134}{2pt}{134}{{U}{FdSymbolE}{m}{n}}}
\DeclareRobustCommand{\FDSYMcenterdot}{\mathbin{\rule{0.15em}{0.15em}}}
\let\FDSYMvdots=\FDSYM@vdots

\DeclareRobustCommand{\FDSYMrelbar}{\mathrel{\smash{\text{\FDSYMminus}}}}
\DeclareRobustCommand{\FDSYMRelbar}{\mathrel{\smash{\text{\FDSYMequal}}}}
\makeatletter
  \def\FDSYMlinesegmentfill@{\arrowfill@{\text{\FDSYMleftfootline}}\FDSYMrelbar{\text{\FDSYMrightfootline}}}
  \def\FDSYMleftharpoonfill@{\arrowfill@{\text{\FDSYMleftharpoondown}}\FDSYMrelbar\FDSYMrelbar}
  \def\FDSYMrightharpoonfill@{\arrowfill@\FDSYMrelbar\FDSYMrelbar{\text{\FDSYMrightharpoonup}}}
  \DeclareRobustCommand{\FDSYMoverlinesegment}{\mathpalette{\overarrow@\FDSYMlinesegmentfill@}}
  \DeclareRobustCommand{\FDSYMoverleftharpoon}{\mathpalette{\overarrow@\FDSYMleftharpoonfill@}}
  \DeclareRobustCommand{\FDSYMoverrightharpoon}{\mathpalette{\overarrow@\FDSYMrightharpoonfill@}}
  \DeclareRobustCommand{\FDSYMunderlinesegment}{\mathpalette{\underarrow@\FDSYMlinesegmentfill@}}
  \DeclareRobustCommand{\FDSYMovergroup}{\mathpalette{\overarrow@\FDSYMdowngroupfill@}}
  \DeclareRobustCommand{\FDSYMundergroup}{\mathpalette{\underarrow@\FDSYMupgroupfill@}}
  \def\FDSYMbracefill@#1#2#3#4#5{%
    $\m@th#5\hbox{#1}\leaders\hbox{#4}\hfill\hbox{#2}\leaders\hbox{#4}\hfill\hbox{#3}$%
  }
  \def\FDSYMdownbracefill@{\FDSYMbracefill@\FDSYMbraceld\FDSYMbracemd\FDSYMbracerd\FDSYMbracemid}
  \def\FDSYMupbracefill@{\FDSYMbracefill@\FDSYMbracelu\FDSYMbracemu\FDSYMbraceru\FDSYMbracemid}
  \def\FDSYMdowngroupfill@{\FDSYMbracefill@\FDSYMbraceld{}\FDSYMbracerd\FDSYMbracemid}
  \def\FDSYMupgroupfill@{\FDSYMbracefill@\FDSYMbracelu{}\FDSYMbraceru\FDSYMbracemid}
  \DeclareRobustCommand{\FDSYMoverbrace}[1]{%
    \mathop{\mathpalette{\overarrow@\FDSYMdownbracefill@}{#1}}\limits
  }
  \DeclareRobustCommand{\FDSYMunderbrace}[1]{%
    \mathop{\mathpalette{\underarrow@\FDSYMupbracefill@}{#1}}\limits%
  }
\makeatother
FDSYM_COMPOSITIONS
    ;

# Write some trailer boilerplate.
print "\n";
print "\\endinput\n";