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27de1486ca
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@140 a592a061-630c-0410-9148-cb99ea01b6c8
122 lines
4.8 KiB
Perl
122 lines
4.8 KiB
Perl
####################### VERBATIM COPYING SUBROUTINES ########################
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# This file is part of reLyX.
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# Copyright (c) 1998-9 Amir Karger karger@post.harvard.edu
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# You are free to use and modify this code under the terms of
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# the GNU General Public Licence version 2 or later.
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#
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# Subs for copying stuff verbatim from a TeX file instead of parsing it.
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# These subs use the rather low-level TT:OpenFile::paragraph method, because
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# the higher level methods assume you've parsed, and verbatim stuff might be
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# parsed normally.
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package Verbatim;
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use strict;
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sub copy_verb {
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# This subroutine handles a \verb token. Text is guaranteed to be on one line.
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# \verb must be followed by a non-letter, then copy anything until the next
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# occurrence of that character.
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my ($fileobject, $token) = @_;
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my $verb = $token->exact_print; # "\verb" or "\verb*"
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my $textref = $fileobject->paragraph;
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# eat e.g., !text $\% text!
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if ($$textref =~ s/^([^A-Za-z*]).*?\1//) {
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$verb .= $&;
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} else { warn "unable to parse \\verb"; $verb .="||" }
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return $verb;
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}
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sub copy_verbatim {
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# This subroutine eats text verbatim until a certain text is reached
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# The end text itself is not eaten; this is necessary so that
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# environments are properly nested (otherwise, TeX.pm complains)
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# It returns a string containing the text
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#
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# Arg 0 is the Text::TeX::OpenFile file object, arg 1 is the beginning token
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my $fileobject = shift;
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my $begin_token = shift;
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my %endtokentbl = ( '\(' => '\)' , '\[' => '\]' );
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my $type = ref($begin_token);
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$type =~ s/^Text::TeX:://o or die "unknown token type $type?!";
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# Figure out beginning & end text of this token or environment
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# Beginning text so we know if you have an environment nested within itself
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# End text so we know when to finish copying OR when to 'pop' a level
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# if an environment is nested within itself
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# Because the searches will generally be matching expressions with backslashes
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# and other meta-characters, we put \Q\E around (pieces of) the expressions
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my ($begin_text, $end_text);
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if ($type =~ /^Token$/) { # \( or \[
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$begin_text = $begin_token->print; # e.g., '\('
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die "unknown begin_text" unless exists $endtokentbl{$begin_text};
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$end_text = "\Q$endtokentbl{$begin_text}\E";
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# actually, begin_text shouldn't be nec. since you can't nest math
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$begin_text = "\Q$begin_text\E"; # quote slashes, etc.
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} elsif (/^Begin::Group::Args$/) { # \begin{foo}
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# \s* to allow, e.g., '\begin {foo}'
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$begin_text = $begin_token->print;
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$begin_text = "\Q$begin_text\E";
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$begin_text =~ s/begin/begin\\s*/;
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($end_text = $begin_text) =~ s/begin/end/;
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} else {
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die "copy_verbatim called with unknown token type $type!";
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}
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#print "\nsub copy_verbatim going to copy until $end_text\n" if $debug_on;
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# Actual copying
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my $textref; # reference to stuff we read in to print
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my $to_print = ""; #text to print
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# we're automatically "nested" once since we had the original \begin
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my $nest_count = 1;
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# (Eat and) Print out paragraphs until you find $end_text
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# paragraph returns "" if it's time to get a new paragraph -- if that
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# happens, we want to continue, but we can't dereference $textref
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# Call paragraph with an argument so that it gets a new paragraph if
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# it gets to the end of a paragraph
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# Allow nesting of this environment!
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while (defined ($textref = $fileobject->paragraph(1))) {
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next unless $textref; # new paragraph; keep going
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# If we match begin or end text, eat everything up to it
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# Make sure to handle (nested) begin & end texts in order, so we can
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# differentiate \begin \begin \end \end from \begin \end \begin \end
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if ($$textref =~ /$end_text/ && $` !~ /$begin_text/) {
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# Note that $` will be from the last *successful* match,
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# namely the end_text match
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--$nest_count;
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$to_print .= $`; # print until the \end command
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if ($nest_count) {
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$to_print .= $&; # print the end text too
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$$textref = $'; # leave the rest in the paragraph
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} else {
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# Leave end text (and anything after it) for TeX.pm
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$$textref = $& . $';
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last; # done copying since there's no more nesting
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}
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# If we match beginning text, we have a nested environment
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} elsif ($$textref =~ /$begin_text/ && $` !~ /$end_text/) {
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$to_print .= $`; # print up to and
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$to_print .= $&; # INCLUDING the begin text
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$$textref = $'; # leave the rest in the paragraph
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++$nest_count;
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# If we didn't match begin OR end text, just eat the whole paragraph
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} else {
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$to_print .= $$textref;
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$$textref = "";
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} # end if $$textref
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} #end while
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die "eof without finding matching text $end_text" if (!defined $textref);
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# return the string
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#print "Exiting sub copy_verbatim\n" if $debug_on;
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return $to_print;
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} # end copy_verbatim
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1; # return true to calling routine
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