ref: 688c1f15cdaa5fcad19d9fddb30e1c555bfc59e0
dir: /sys/src/cmd/python/Doc/tools/html2texi.pl/
#! /usr/bin/env perl
# html2texi.pl -- Convert HTML documentation to Texinfo format
# Michael Ernst <[email protected]>
# Time-stamp: <1999-01-12 21:34:27 mernst>
# This program converts HTML documentation trees into Texinfo format.
# Given the name of a main (or contents) HTML file, it processes that file,
# and other files (transitively) referenced by it, into a Texinfo file
# (whose name is chosen from the file or directory name of the argument).
# For instance:
# html2texi.pl api/index.html
# produces file "api.texi".
# Texinfo format can be easily converted to Info format (for browsing in
# Emacs or the standalone Info browser), to a printed manual, or to HTML.
# Thus, html2texi.pl permits conversion of HTML files to Info format, and
# secondarily enables producing printed versions of Web page hierarchies.
# Unlike HTML, Info format is searchable. Since Info is integrated into
# Emacs, one can read documentation without starting a separate Web
# browser. Additionally, Info browsers (including Emacs) contain
# convenient features missing from Web browsers, such as easy index lookup
# and mouse-free browsing.
# Limitations:
# html2texi.pl is currently tuned to latex2html output (and it corrects
# several latex2html bugs), but should be extensible to arbitrary HTML
# documents. It will be most useful for HTML with a hierarchical structure
# and an index, and it recognizes those features as created by latex2html
# (and possibly by some other tools). The HTML tree to be traversed must
# be on local disk, rather than being accessed via HTTP.
# This script requires the use of "checkargs.pm". To eliminate that
# dependence, replace calls to check_args* by @_ (which is always the last
# argument to those functions).
# Also see the "to do" section, below.
# Comments, suggestions, bug fixes, and enhancements are welcome.
# Troubleshooting:
# Malformed HTML can cause this program to abort, so
# you should check your HTML files to make sure they are legal.
###
### Typical usage for the Python documentation:
###
# (Actually, most of this is in a Makefile instead.)
# The resulting Info format Python documentation is currently available at
# ftp://ftp.cs.washington.edu/homes/mernst/python-info.tar.gz
# Fix up HTML problems, eg <DT><DL COMPACT><DD> should be <DT><DL COMPACT><DD>.
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/api/index.html
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/ext/index.html
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/lib/index.html
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/mac/index.html
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/ref/index.html
# html2texi.pl /homes/fish/mernst/tmp/python-doc/html/tut/index.html
# Edit the generated .texi files:
# * change @setfilename to prefix "python-"
# * fix up any sectioning, such as for Abstract
# * make Texinfo menus
# * perhaps remove the @detailmenu ... @end detailmenu
# In Emacs, to do all this:
# (progn (goto-char (point-min)) (replace-regexp "\\(@setfilename \\)\\([-a-z]*\\)$" "\\1python-\\2.info") (replace-string "@node Front Matter\n@chapter Abstract\n" "@node Abstract\n@section Abstract\n") (progn (mark-whole-buffer) (texinfo-master-menu 'update-all-nodes)) (save-buffer))
# makeinfo api.texi
# makeinfo ext.texi
# makeinfo lib.texi
# makeinfo mac.texi
# makeinfo ref.texi
# makeinfo tut.texi
###
### Structure of the code
###
# To be written...
###
### Design decisions
###
# Source and destination languages
# --------------------------------
#
# The goal is Info files; I create Texinfo, so I don't have to worry about
# the finer details of Info file creation. (I'm not even sure of its exact
# format.)
#
# Why not start from LaTeX rather than HTML?
# I could hack latex2html itself to produce Texinfo instead, or fix up
# partparse.py (which already translates LaTeX to Teinfo).
# Pros:
# * has high-level information such as index entries, original formatting
# Cons:
# * those programs are complicated to read and understand
# * those programs try to handle arbitrary LaTeX input, track catcodes,
# and more: I don't want to go to that effort. HTML isn't as powerful
# as LaTeX, so there are fewer subtleties.
# * the result wouldn't work for arbitrary HTML documents; it would be
# nice to eventually extend this program to HTML produced from Docbook,
# Frame, and more.
# Parsing
# -------
#
# I don't want to view the text as a linear stream; I'd rather parse the
# whole thing and then do pattern matching over the parsed representation (to
# find idioms such as indices, lists of child nodes, etc.).
# * Perl provides HTML::TreeBuilder, which does just what I want.
# * libwww-perl: http://www.linpro.no/lwp/
# * TreeBuilder: HTML-Tree-0.51.tar.gz
# * Python Parsers, Formatters, and Writers don't really provide the right
# interface (and the version in Grail doesn't correspond to another
# distributed version, so I'm confused about which to be using). I could
# write something in Python that creates a parse tree, but why bother?
# Other implementation language issues:
# * Python lacks variable declarations, reasonable scoping, and static
# checking tools. I've written some of the latter for myself that make
# my Perl programming a lot safer than my Python programming will be until
# I have a similar suite for that language.
###########################################################################
### To do
###
# Section names:
# Fix the problem with multiple sections in a single file (eg, Abstract in
# Front Matter section).
# Deal with cross-references, as in /homes/fish/mernst/tmp/python-doc/html/ref/types.html:310
# Index:
# Perhaps double-check that every tag mentioned in the index is found
# in the text.
# Python: email to [email protected], to get their feedback.
# Compare to existing lib/ Info manual
# Write the hooks into info-look; replace pyliblookup1-1.tar.gz.
# Postpass to remove extra quotation marks around typography already in
# a different font (to avoid double delimiters as in "`code'"); or
# perhaps consider using only font-based markup so that we don't get
# the extra *bold* and `code' markup in Info.
## Perhaps don't rely on automatic means for adding up, next, prev; I have
## all that info available to me already, so it's not so much trouble to
## add it. (Right?) But it is *so* easy to use Emacs instead...
###########################################################################
### Strictures
###
# man HTML::TreeBuilder
# man HTML::Parser
# man HTML::Element
# require HTML::ParserWComment;
require HTML::Parser;
require HTML::TreeBuilder;
require HTML::Element;
use File::Basename;
use strict;
# use Carp;
use checkargs;
###########################################################################
### Variables
###
my @section_stack = (); # elements are chapter/section/subsec nodetitles (I think)
my $current_ref_tdf; # for the file currently being processed;
# used in error messages
my $html_directory;
my %footnotes;
# First element should not be used.
my @sectionmarker = ("manual", "chapter", "section", "subsection", "subsubsection");
my %inline_markup = ("b" => "strong",
"code" => "code",
"i" => "emph",
"kbd" => "kbd",
"samp" => "samp",
"strong" => "strong",
"tt" => "code",
"var" => "var");
my @deferred_index_entries = ();
my @index_titles = (); # list of (filename, type) lists
my %index_info = ("Index" => ["\@blindex", "bl"],
"Concept Index" => ["\@cindex", "cp"],
"Module Index" => ["\@mdindex", "md"]);
###########################################################################
### Main/contents page
###
# Process first-level page on its own, or just a contents page? Well, I do
# want the title, author, etc., and the front matter... For now, just add
# that by hand at the end.
# data structure possibilities:
# * tree-like (need some kind of stack when processing (or parent pointers))
# * list of name and depth; remember old and new depths.
# Each element is a reference to a list of (nodetitle, depth, filename).
my @contents_list = ();
# The problem with doing fixups on the fly is that some sections may have
# already been processed (and no longer available) by the time we notice
# others with the same name. It's probably better to fully construct the
# contents list (reading in all files of interest) upfront; that will also
# let me do a better job with cross-references, because again, all files
# will already be read in.
my %contents_hash = ();
my %contents_fixups = ();
my @current_contents_list = ();
# Merge @current_contents_list into @contents_list,
# and set @current_contents_list to be empty.
sub merge_contents_lists ( )
{ check_args(0, @_);
# Three possibilities:
# * @contents_list is empty: replace it by @current_contents_list.
# * prefixes of the two lists are identical: do nothing
# * @current_contents_list is all at lower level than $contents_list[0];
# prefix @contents_list by @current_contents_list
if (scalar(@current_contents_list) == 0)
{ die "empty current_contents_list"; }
# if (scalar(@contents_list) == 0)
# { @contents_list = @current_contents_list;
# @current_contents_list = ();
# return; }
# if (($ {$contents_list[0]}[1]) < ($ {$current_contents_list[0]}[1]))
# { unshift @contents_list, @current_contents_list;
# @current_contents_list = ();
# return; }
for (my $i=0; $i<scalar(@current_contents_list); $i++)
{ my $ref_c_tdf = $current_contents_list[$i];
if ($i >= scalar(@contents_list))
{ push @contents_list, $ref_c_tdf;
my $title = $ {$ref_c_tdf}[0];
if (defined $contents_hash{$title})
{ $contents_fixups{$title} = 1; }
else
{ $contents_hash{$title} = 1; }
next; }
my $ref_tdf = $contents_list[$i];
my ($title, $depth, $file) = @{$ref_tdf};
my ($c_title, $c_depth, $c_file) = @{$ref_c_tdf};
if (($title ne $c_title)
&& ($depth < $c_depth)
&& ($file ne $c_file))
{ splice @contents_list, $i, 0, $ref_c_tdf;
if (defined $contents_hash{$c_title})
{ $contents_fixups{$c_title} = 1; }
else
{ $contents_hash{$c_title} = 1; }
next; }
if (($title ne $c_title)
|| ($depth != $c_depth)
|| ($file ne $c_file))
{ die ("while processing $ {$current_ref_tdf}[2] at depth $ {$current_ref_tdf}[1], mismatch at index $i:",
"\n main: <<<$title>>> $depth $file",
"\n curr: <<<$c_title>>> $c_depth $c_file"); }
}
@current_contents_list = ();
}
# Set @current_contents_list to a list of (title, href, sectionlevel);
# then merge that list into @contents_list.
# Maybe this function should also produce a map
# from title (or href) to sectionlevel (eg "chapter"?).
sub process_child_links ( $ )
{ my ($he) = check_args(1, @_);
# $he->dump();
if (scalar(@current_contents_list) != 0)
{ die "current_contents_list nonempty: @current_contents_list"; }
$he->traverse(\&increment_current_contents_list, 'ignore text');
# Normalize the depths; for instance, convert 1,3,5 into 0,1,2.
my %depths = ();
for my $ref_tdf (@current_contents_list)
{ $depths{$ {$ref_tdf}[1]} = 1; }
my @sorted_depths = sort keys %depths;
my $current_depth = scalar(@section_stack)-1;
my $current_depth_2 = $ {$current_ref_tdf}[1];
if ($current_depth != $current_depth_2)
{ die "mismatch in current depths: $current_depth $current_depth_2; ", join(", ", @section_stack); }
for (my $i=0; $i<scalar(@sorted_depths); $i++)
{ $depths{$sorted_depths[$i]} = $i + $current_depth+1; }
for my $ref_tdf (@current_contents_list)
{ $ {$ref_tdf}[1] = $depths{$ {$ref_tdf}[1]}; }
# Eliminate uninteresting sections. Hard-coded hack for now.
if ($ {$current_contents_list[-1]}[0] eq "About this document ...")
{ pop @current_contents_list; }
if ((scalar(@current_contents_list) > 1)
&& ($ {$current_contents_list[1]}[0] eq "Contents"))
{ my $ref_first_tdf = shift @current_contents_list;
$current_contents_list[0] = $ref_first_tdf; }
for (my $i=0; $i<scalar(@current_contents_list); $i++)
{ my $ref_tdf = $current_contents_list[$i];
my $title = $ {$ref_tdf}[0];
if (exists $index_info{$title})
{ my $index_file = $ {$ref_tdf}[2];
my ($indexing_command, $suffix) = @{$index_info{$title}};
process_index_file($index_file, $indexing_command);
print TEXI "\n\@defindex $suffix\n";
push @index_titles, $title;
splice @current_contents_list, $i, 1;
$i--; }
elsif ($title =~ /\bIndex$/)
{ print STDERR "Warning: \"$title\" might be an index; if so, edit \%index_info.\n"; } }
merge_contents_lists();
# print_contents_list();
# print_index_info();
}
sub increment_current_contents_list ( $$$ )
{ my ($he, $startflag, $depth) = check_args(3, @_);
if (!$startflag)
{ return; }
if ($he->tag eq "li")
{ my @li_content = @{$he->content};
if ($li_content[0]->tag ne "a")
{ die "first element of <LI> should be <A>"; }
my ($name, $href, @content) = anchor_info($li_content[0]);
# unused $name
my $title = join("", collect_texts($li_content[0]));
$title = texi_remove_punctuation($title);
# The problem with these is that they are formatted differently in
# @menu and @node!
$title =~ s/``/\"/g;
$title =~ s/''/\"/g;
$title =~ s/ -- / /g;
push @current_contents_list, [ $title, $depth, $href ]; }
return 1;
}
# Simple version for section titles
sub html_to_texi ( $ )
{ my ($he) = check_args(1, @_);
if (!ref $he)
{ return $he; }
my $tag = $he->tag;
if (exists $inline_markup{$tag})
{ my $result = "\@$inline_markup{$tag}\{";
for my $elt (@{$he->content})
{ $result .= html_to_texi($elt); }
$result .= "\}";
return $result; }
else
{ $he->dump();
die "html_to_texi confused by <$tag>"; }
}
sub print_contents_list ()
{ check_args(0, @_);
print STDERR "Contents list:\n";
for my $ref_tdf (@contents_list)
{ my ($title, $depth, $file) = @{$ref_tdf};
print STDERR "$title $depth $file\n"; }
}
###########################################################################
### Index
###
my $l2h_broken_link_name = "l2h-";
# map from file to (map from anchor name to (list of index texts))
# (The list is needed when a single LaTeX command like \envvar
# expands to multiple \index commands.)
my %file_index_entries = ();
my %this_index_entries; # map from anchor name to (list of index texts)
my %file_index_entries_broken = (); # map from file to (list of index texts)
my @this_index_entries_broken;
my $index_prefix = "";
my @index_prefixes = ();
my $this_indexing_command;
sub print_index_info ()
{ check_args(0, @_);
my ($key, $val);
for my $file (sort keys %file_index_entries)
{ my %index_entries = %{$file_index_entries{$file}};
print STDERR "file: $file\n";
for my $aname (sort keys %index_entries)
{ my @entries = @{$index_entries{$aname}};
if (scalar(@entries) == 1)
{ print STDERR " $aname : $entries[0]\n"; }
else
{ print STDERR " $aname : ", join("\n " . (" " x length($aname)), @entries), "\n"; } } }
for my $file (sort keys %file_index_entries_broken)
{ my @entries = @{$file_index_entries_broken{$file}};
print STDERR "file: $file\n";
for my $entry (@entries)
{ print STDERR " $entry\n"; }
}
}
sub process_index_file ( $$ )
{ my ($file, $indexing_command) = check_args(2, @_);
# print "process_index_file $file $indexing_command\n";
my $he = file_to_tree($html_directory . $file);
# $he->dump();
$this_indexing_command = $indexing_command;
$he->traverse(\&process_if_index_dl_compact, 'ignore text');
undef $this_indexing_command;
# print "process_index_file done\n";
}
sub process_if_index_dl_compact ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
if (($he->tag() eq "dl") && (defined $he->attr('compact')))
{ process_index_dl_compact($he);
return 0; }
else
{ return 1; }
}
# The elements of a <DL COMPACT> list from a LaTeX2HTML index:
# * a single space: text to be ignored
# * <DT> elements with an optional <DD> element following each one
# Two types of <DT> elements:
# * Followed by a <DD> element: the <DT> contains a single
# string, and the <DD> contains a whitespace string to be ignored, a
# <DL COMPACT> to be recursively processed (with the <DT> string as a
# prefix), and a whitespace string to be ignored.
# * Not followed by a <DD> element: contains a list of anchors
# and texts (ignore the texts, which are only whitespace and commas).
# Optionally contains a <DL COMPACT> to be recursively processed (with
# the <DT> string as a prefix)
sub process_index_dl_compact ( $ )
{ my ($h) = check_args(1, @_);
my @content = @{$h->content()};
for (my $i = 0; $i < scalar(@content); $i++)
{ my $this_he = $content[$i];
if ($this_he->tag ne "dt")
{ $this_he->dump();
die "Expected <DT> tag: " . $this_he->tag; }
if (($i < scalar(@content) - 1) && ($content[$i+1]->tag eq "dd"))
{ process_index_dt_and_dd($this_he, $content[$i+1]);
$i++; }
else
{ process_index_lone_dt($this_he); } } }
# Argument is a <DT> element. If it contains more than one anchor, then
# the texts of all subsequent ones are "[Link]". Example:
# <DT>
# <A HREF="embedding.html#l2h-201">
# "$PATH"
# ", "
# <A HREF="embedding.html#l2h-205">
# "[Link]"
# Optionally contains a <DL COMPACT> as well. Example:
# <DT>
# <A HREF="types.html#l2h-616">
# "attribute"
# <DL COMPACT>
# <DT>
# <A HREF="assignment.html#l2h-3074">
# "assignment"
# ", "
# <A HREF="assignment.html#l2h-3099">
# "[Link]"
# <DT>
# <A HREF="types.html#l2h-">
# "assignment, class"
sub process_index_lone_dt ( $ )
{ my ($dt) = check_args(1, @_);
my @dtcontent = @{$dt->content()};
my $acontent;
my $acontent_suffix;
for my $a (@dtcontent)
{ if ($a eq ", ")
{ next; }
if (!ref $a)
{ $dt->dump;
die "Unexpected <DT> string element: $a"; }
if ($a->tag eq "dl")
{ push @index_prefixes, $index_prefix;
if (!defined $acontent_suffix)
{ die "acontent_suffix not yet defined"; }
$index_prefix .= $acontent_suffix . ", ";
process_index_dl_compact($a);
$index_prefix = pop(@index_prefixes);
return; }
if ($a->tag ne "a")
{ $dt->dump;
$a->dump;
die "Expected anchor in lone <DT>"; }
my ($aname, $ahref, @acontent) = anchor_info($a);
# unused $aname
if (scalar(@acontent) != 1)
{ die "Expected just one content of <A> in <DT>: @acontent"; }
if (ref $acontent[0])
{ $acontent[0]->dump;
die "Expected string content of <A> in <DT>: $acontent[0]"; }
if (!defined($acontent))
{ $acontent = $index_prefix . $acontent[0];
$acontent_suffix = $acontent[0]; }
elsif (($acontent[0] ne "[Link]") && ($acontent ne ($index_prefix . $acontent[0])))
{ die "Differing content: <<<$acontent>>>, <<<$acontent[0]>>>"; }
if (!defined $ahref)
{ $dt->dump;
die "no HREF in nachor in <DT>"; }
my ($ahref_file, $ahref_name) = split(/\#/, $ahref);
if (!defined $ahref_name)
{ # Reference to entire file
$ahref_name = ""; }
if ($ahref_name eq $l2h_broken_link_name)
{ if (!exists $file_index_entries_broken{$ahref_file})
{ $file_index_entries_broken{$ahref_file} = []; }
push @{$file_index_entries_broken{$ahref_file}}, "$this_indexing_command $acontent";
next; }
if (!exists $file_index_entries{$ahref_file})
{ $file_index_entries{$ahref_file} = {}; }
# Don't do this! It appears to make a copy, which is not desired.
# my %index_entries = %{$file_index_entries{$ahref_file}};
if (!exists $ {$file_index_entries{$ahref_file}}{$ahref_name})
{ $ {$file_index_entries{$ahref_file}}{$ahref_name} = []; }
# { my $oldcontent = $ {$file_index_entries{$ahref_file}}{$ahref_name};
# if ($acontent eq $oldcontent)
# { die "Multiple identical index entries?"; }
# die "Trying to add $acontent, but already have index entry pointing at $ahref_file\#$ahref_name: ${$file_index_entries{$ahref_file}}{$ahref_name}"; }
push @{$ {$file_index_entries{$ahref_file}}{$ahref_name}}, "$this_indexing_command $acontent";
# print STDERR "keys: ", keys %{$file_index_entries{$ahref_file}}, "\n";
}
}
sub process_index_dt_and_dd ( $$ )
{ my ($dt, $dd) = check_args(2, @_);
my $dtcontent;
{ my @dtcontent = @{$dt->content()};
if ((scalar(@dtcontent) != 1) || (ref $dtcontent[0]))
{ $dd->dump;
$dt->dump;
die "Expected single string (actual size = " . scalar(@dtcontent) . ") in content of <DT>: @dtcontent"; }
$dtcontent = $dtcontent[0];
$dtcontent =~ s/ +$//; }
my $ddcontent;
{ my @ddcontent = @{$dd->content()};
if (scalar(@ddcontent) != 1)
{ die "Expected single <DD> content, got ", scalar(@ddcontent), " elements:\n", join("\n", @ddcontent), "\n "; }
$ddcontent = $ddcontent[0]; }
if ($ddcontent->tag ne "dl")
{ die "Expected <DL> as content of <DD>, but saw: $ddcontent"; }
push @index_prefixes, $index_prefix;
$index_prefix .= $dtcontent . ", ";
process_index_dl_compact($ddcontent);
$index_prefix = pop(@index_prefixes);
}
###########################################################################
### Ordinary sections
###
sub process_section_file ( $$$ )
{ my ($file, $depth, $nodetitle) = check_args(3, @_);
my $he = file_to_tree(($file =~ /^\//) ? $file : $html_directory . $file);
# print STDERR "process_section_file: $file $depth $nodetitle\n";
# Equivalently:
# while ($depth >= scalar(@section_stack)) { pop(@section_stack); }
@section_stack = @section_stack[0..$depth-1];
# Not a great nodename fixup scheme; need a more global view
if ((defined $contents_fixups{$nodetitle})
&& (scalar(@section_stack) > 0))
{ my $up_title = $section_stack[$#section_stack];
# hack for Python Standard Library
$up_title =~ s/^(Built-in|Standard) Module //g;
my ($up_first_word) = split(/ /, $up_title);
$nodetitle = "$up_first_word $nodetitle";
}
push @section_stack, $nodetitle;
# print STDERR "new section_stack: ", join(", ", @section_stack), "\n";
$he->traverse(\&process_if_child_links, 'ignore text');
%footnotes = ();
# $he->dump;
$he->traverse(\&process_if_footnotes, 'ignore text');
# $he->dump;
if (exists $file_index_entries{$file})
{ %this_index_entries = %{$file_index_entries{$file}};
# print STDERR "this_index_entries:\n ", join("\n ", keys %this_index_entries), "\n";
}
else
{ # print STDERR "Warning: no index entries for file $file\n";
%this_index_entries = (); }
if (exists $file_index_entries_broken{$file})
{ @this_index_entries_broken = @{$file_index_entries_broken{$file}}; }
else
{ # print STDERR "Warning: no index entries for file $file\n";
@this_index_entries_broken = (); }
if ($he->tag() ne "html")
{ die "Expected <HTML> at top level"; }
my @content = @{$he->content()};
if ((!ref $content[0]) or ($content[0]->tag ne "head"))
{ $he->dump;
die "<HEAD> not first element of <HTML>"; }
if ((!ref $content[1]) or ($content[1]->tag ne "body"))
{ $he->dump;
die "<BODY> not second element of <HTML>"; }
$content[1]->traverse(\&output_body);
}
# stack of things we're inside that are preventing indexing from occurring now.
# These are "h1", "h2", "h3", "h4", "h5", "h6", "dt" (and possibly others?)
my @index_deferrers = ();
sub push_or_pop_index_deferrers ( $$ )
{ my ($tag, $startflag) = check_args(2, @_);
if ($startflag)
{ push @index_deferrers, $tag; }
else
{ my $old_deferrer = pop @index_deferrers;
if ($tag ne $old_deferrer)
{ die "Expected $tag at top of index_deferrers but saw $old_deferrer; remainder = ", join(" ", @index_deferrers); }
do_deferred_index_entries(); }
}
sub label_add_index_entries ( $;$ )
{ my ($label, $he) = check_args_range(1, 2, @_);
# print ((exists $this_index_entries{$label}) ? "*" : " "), " label_add_index_entries $label\n";
# $he is the anchor element
if (exists $this_index_entries{$label})
{ push @deferred_index_entries, @{$this_index_entries{$label}};
return; }
if ($label eq $l2h_broken_link_name)
{ # Try to find some text to use in guessing which links should point here
# I should probably only look at the previous element, or if that is
# all punctuation, the one before it; collecting all the previous texts
# is a bit of overkill.
my @anchor_texts = collect_texts($he);
my @previous_texts = collect_texts($he->parent, $he);
# 4 elements is arbitrary; ought to filter out punctuation and small words
# first, then perhaps keep fewer. Perhaps also filter out formatting so
# that we can see a larger chunk of text? (Probably not.)
# Also perhaps should do further chunking into words, in case the
# index term isn't a chunk of its own (eg, was in <tt>...</tt>.
my @candidate_texts = (@anchor_texts, (reverse(@previous_texts))[0..min(3,$#previous_texts)]);
my $guessed = 0;
for my $text (@candidate_texts)
{ # my $orig_text = $text;
if ($text =~ /^[\"\`\'().?! ]*$/)
{ next; }
if (length($text) <= 2)
{ next; }
# hack for Python manual; maybe defer until failure first time around?
$text =~ s/^sys\.//g;
for my $iterm (@this_index_entries_broken)
{ # I could test for zero: LaTeX2HTML's failures in the Python
# documentation are only for items of the form "... (built-in...)"
if (index($iterm, $text) != -1)
{ push @deferred_index_entries, $iterm;
# print STDERR "Guessing index term `$iterm' for text `$orig_text'\n";
$guessed = 1;
} } }
if (!$guessed)
{ # print STDERR "No guess in `", join("'; `", @this_index_entries_broken), "' for texts:\n `", join("'\n `", @candidate_texts), "'\n";
}
}
}
# Need to add calls to this at various places.
# Perhaps add HTML::Element argument and do the check for appropriateness
# here (ie, no action if inside <H1>, etc.).
sub do_deferred_index_entries ()
{ check_args(0, @_);
if ((scalar(@deferred_index_entries) > 0)
&& (scalar(@index_deferrers) == 0))
{ print TEXI "\n", join("\n", @deferred_index_entries), "\n";
@deferred_index_entries = (); }
}
my $table_columns; # undefined if not in a table
my $table_first_column; # boolean
sub output_body ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!ref $he)
{ my $space_index = index($he, " ");
if ($space_index != -1)
{ # Why does
# print TEXI texi_quote(substr($he, 0, $space_index+1));
# give: Can't locate object method "TEXI" via package "texi_quote"
# (Because the definition texi_quote hasn't been seen yet.)
print TEXI &texi_quote(substr($he, 0, $space_index+1));
do_deferred_index_entries();
print TEXI &texi_quote(substr($he, $space_index+1)); }
else
{ print TEXI &texi_quote($he); }
return; }
my $tag = $he->tag();
# Ordinary text markup first
if (exists $inline_markup{$tag})
{ if ($startflag)
{ print TEXI "\@$inline_markup{$tag}\{"; }
else
{ print TEXI "\}"; } }
elsif ($tag eq "a")
{ my ($name, $href, @content) = anchor_info($he);
if (!$href)
{ # This anchor is only here for indexing/cross referencing purposes.
if ($startflag)
{ label_add_index_entries($name, $he); }
}
elsif ($href =~ "^(ftp|http|news):")
{ if ($startflag)
{ # Should avoid second argument if it's identical to the URL.
print TEXI "\@uref\{$href, "; }
else
{ print TEXI "\}"; }
}
elsif ($href =~ /^\#(foot[0-9]+)$/)
{ # Footnote
if ($startflag)
{ # Could double-check name and content, but I'm not
# currently storing that information.
print TEXI "\@footnote\{";
$footnotes{$1}->traverse(\&output_body);
print TEXI "\}";
return 0; } }
else
{ if ($startflag)
{ # cross-references are not active Info links, but no text is lost
print STDERR "Can't deal with internal HREF anchors yet:\n";
$he->dump; }
}
}
elsif ($tag eq "br")
{ print TEXI "\@\n"; }
elsif ($tag eq "body")
{ }
elsif ($tag eq "center")
{ if (has_single_content_string($he)
&& ($ {$he->content}[0] =~ /^ *$/))
{ return 0; }
if ($startflag)
{ print TEXI "\n\@center\n"; }
else
{ print TEXI "\n\@end center\n"; }
}
elsif ($tag eq "div")
{ my $align = $he->attr('align');
if (defined($align) && ($align eq "center"))
{ if (has_single_content_string($he)
&& ($ {$he->content}[0] =~ /^ *$/))
{ return 0; }
if ($startflag)
{ print TEXI "\n\@center\n"; }
else
{ print TEXI "\n\@end center\n"; } }
}
elsif ($tag eq "dl")
{ # Recognize "<dl><dd><pre> ... </pre></dl>" paradigm for "@example"
if (has_single_content_with_tag($he, "dd"))
{ my $he_dd = $ {$he->content}[0];
if (has_single_content_with_tag($he_dd, "pre"))
{ my $he_pre = $ {$he_dd->content}[0];
print_pre($he_pre);
return 0; } }
if ($startflag)
{ # Could examine the elements, to be cleverer about formatting.
# (Also to use ftable, vtable...)
print TEXI "\n\@table \@asis\n"; }
else
{ print TEXI "\n\@end table\n"; }
}
elsif ($tag eq "dt")
{ push_or_pop_index_deferrers($tag, $startflag);
if ($startflag)
{ print TEXI "\n\@item "; }
else
{ } }
elsif ($tag eq "dd")
{ if ($startflag)
{ print TEXI "\n"; }
else
{ }
if (scalar(@index_deferrers) != 0)
{ $he->dump;
die "Unexpected <$tag> while inside: (" . join(" ", @index_deferrers) . "); bad HTML?"; }
do_deferred_index_entries();
}
elsif ($tag =~ /^(font|big|small)$/)
{ # Do nothing for now.
}
elsif ($tag =~ /^h[1-6]$/)
{ # We don't need this because we never recursively enter the heading content.
# push_or_pop_index_deferrers($tag, $startflag);
my $secname = "";
my @seclabels = ();
for my $elt (@{$he->content})
{ if (!ref $elt)
{ $secname .= $elt; }
elsif ($elt->tag eq "br")
{ }
elsif ($elt->tag eq "a")
{ my ($name, $href, @acontent) = anchor_info($elt);
if ($href)
{ $he->dump;
$elt->dump;
die "Nonsimple anchor in <$tag>"; }
if (!defined $name)
{ die "No NAME for anchor in $tag"; }
push @seclabels, $name;
for my $subelt (@acontent)
{ $secname .= html_to_texi($subelt); } }
else
{ $secname .= html_to_texi($elt); } }
if ($secname eq "")
{ die "No section name in <$tag>"; }
if (scalar(@section_stack) == 1)
{ if ($section_stack[-1] ne "Top")
{ die "Not top? $section_stack[-1]"; }
print TEXI "\@settitle $secname\n";
print TEXI "\@c %**end of header\n";
print TEXI "\n";
print TEXI "\@node Top\n";
print TEXI "\n"; }
else
{ print TEXI "\n\@node $section_stack[-1]\n";
print TEXI "\@$sectionmarker[scalar(@section_stack)-1] ", texi_remove_punctuation($secname), "\n"; }
for my $seclabel (@seclabels)
{ label_add_index_entries($seclabel); }
# This should only happen once per file.
label_add_index_entries("");
if (scalar(@index_deferrers) != 0)
{ $he->dump;
die "Unexpected <$tag> while inside: (" . join(" ", @index_deferrers) . "); bad HTML?"; }
do_deferred_index_entries();
return 0;
}
elsif ($tag eq "hr")
{ }
elsif ($tag eq "ignore")
{ # Hack for ignored elements
return 0;
}
elsif ($tag eq "li")
{ if ($startflag)
{ print TEXI "\n\n\@item\n";
do_deferred_index_entries(); } }
elsif ($tag eq "ol")
{ if ($startflag)
{ print TEXI "\n\@enumerate \@bullet\n"; }
else
{ print TEXI "\n\@end enumerate\n"; } }
elsif ($tag eq "p")
{ if ($startflag)
{ print TEXI "\n\n"; }
if (scalar(@index_deferrers) != 0)
{ $he->dump;
die "Unexpected <$tag> while inside: (" . join(" ", @index_deferrers) . "); bad HTML?"; }
do_deferred_index_entries(); }
elsif ($tag eq "pre")
{ print_pre($he);
return 0; }
elsif ($tag eq "table")
{ # Could also indicate common formatting for first column, or
# determine relative widths for columns (or determine a prototype row)
if ($startflag)
{ if (defined $table_columns)
{ $he->dump;
die "Can't deal with table nested inside $table_columns-column table"; }
$table_columns = table_columns($he);
if ($table_columns < 2)
{ $he->dump;
die "Column with $table_columns columns?"; }
elsif ($table_columns == 2)
{ print TEXI "\n\@table \@asis\n"; }
else
{ print TEXI "\n\@multitable \@columnfractions";
for (my $i=0; $i<$table_columns; $i++)
{ print TEXI " ", 1.0/$table_columns; }
print TEXI "\n"; } }
else
{ if ($table_columns == 2)
{ print TEXI "\n\@end table\n"; }
else
{ print TEXI "\n\@end multitable\n"; }
undef $table_columns; } }
elsif (($tag eq "td") || ($tag eq "th"))
{ if ($startflag)
{ if ($table_first_column)
{ print TEXI "\n\@item ";
$table_first_column = 0; }
elsif ($table_columns > 2)
{ print TEXI "\n\@tab "; } }
else
{ print TEXI "\n"; } }
elsif ($tag eq "tr")
{ if ($startflag)
{ $table_first_column = 1; } }
elsif ($tag eq "ul")
{ if ($startflag)
{ print TEXI "\n\@itemize \@bullet\n"; }
else
{ print TEXI "\n\@end itemize\n"; } }
else
{ # I used to have a newline before "output_body" here.
print STDERR "output_body: ignoring <$tag> tag\n";
$he->dump;
return 0; }
return 1;
}
sub print_pre ( $ )
{ my ($he_pre) = check_args(1, @_);
if (!has_single_content_string($he_pre))
{ die "Multiple or non-string content for <PRE>: ", @{$he_pre->content}; }
my $pre_content = $ {$he_pre->content}[0];
print TEXI "\n\@example";
print TEXI &texi_quote($pre_content);
print TEXI "\@end example\n";
}
sub table_columns ( $ )
{ my ($table) = check_args(1, @_);
my $result = 0;
for my $row (@{$table->content})
{ if ($row->tag ne "tr")
{ $table->dump;
$row->dump;
die "Expected <TR> as table row."; }
$result = max($result, scalar(@{$row->content})); }
return $result;
}
###########################################################################
### Utilities
###
sub min ( $$ )
{ my ($x, $y) = check_args(2, @_);
return ($x < $y) ? $x : $y;
}
sub max ( $$ )
{ my ($x, $y) = check_args(2, @_);
return ($x > $y) ? $x : $y;
}
sub file_to_tree ( $ )
{ my ($file) = check_args(1, @_);
my $tree = new HTML::TreeBuilder;
$tree->ignore_unknown(1);
# $tree->warn(1);
$tree->parse_file($file);
cleanup_parse_tree($tree);
return $tree
}
sub has_single_content ( $ )
{ my ($he) = check_args(1, @_);
if (!ref $he)
{ # return 0;
die "Non-reference argument: $he"; }
my $ref_content = $he->content;
if (!defined $ref_content)
{ return 0; }
my @content = @{$ref_content};
if (scalar(@content) != 1)
{ return 0; }
return 1;
}
# Return true if the content of the element contains only one element itself,
# and that inner element has the specified tag.
sub has_single_content_with_tag ( $$ )
{ my ($he, $tag) = check_args(2, @_);
if (!has_single_content($he))
{ return 0; }
my $content = $ {$he->content}[0];
if (!ref $content)
{ return 0; }
my $content_tag = $content->tag;
if (!defined $content_tag)
{ return 0; }
return $content_tag eq $tag;
}
sub has_single_content_string ( $ )
{ my ($he) = check_args(1, @_);
if (!has_single_content($he))
{ return 0; }
my $content = $ {$he->content}[0];
if (ref $content)
{ return 0; }
return 1;
}
# Return name, href, content. First two may be undefined; third is an array.
# I don't see how to determine if there are more attributes.
sub anchor_info ( $ )
{ my ($he) = check_args(1, @_);
if ($he->tag ne "a")
{ $he->dump;
die "passed non-anchor to anchor_info"; }
my $name = $he->attr('name');
my $href = $he->attr('href');
my @content = ();
{ my $ref_content = $he->content;
if (defined $ref_content)
{ @content = @{$ref_content}; } }
return ($name, $href, @content);
}
sub texi_quote ( $ )
{ my ($text) = check_args(1, @_);
$text =~ s/([\@\{\}])/\@$1/g;
$text =~ s/ -- / --- /g;
return $text;
}
# Eliminate bad punctuation (that confuses Makeinfo or Info) for section titles.
sub texi_remove_punctuation ( $ )
{ my ($text) = check_args(1, @_);
$text =~ s/^ +//g;
$text =~ s/[ :]+$//g;
$text =~ s/^[1-9][0-9.]* +//g;
$text =~ s/,//g;
# Both embedded colons and " -- " confuse makeinfo. (Perhaps " -- "
# gets converted into " - ", just as "---" would be converted into " -- ",
# so the names end up differing.)
# $text =~ s/:/ -- /g;
$text =~ s/://g;
return $text;
}
## Do not use this inside `traverse': it throws off the traversal. Use
## html_replace_by_ignore or html_replace_by_meta instead.
# Returns 1 if success, 0 if failure.
sub html_remove ( $;$ )
{ my ($he, $parent) = check_args_range(1, 2, @_);
if (!defined $parent)
{ $parent = $he->parent; }
my $ref_pcontent = $parent->content;
my @pcontent = @{$ref_pcontent};
for (my $i=0; $i<scalar(@pcontent); $i++)
{ if ($pcontent[$i] eq $he)
{ splice @{$ref_pcontent}, $i, 1;
$he->parent(undef);
return 1; } }
die "Didn't find $he in $parent";
}
sub html_replace ( $$;$ )
{ my ($orig, $new, $parent) = check_args_range(2, 3, @_);
if (!defined $parent)
{ $parent = $orig->parent; }
my $ref_pcontent = $parent->content;
my @pcontent = @{$ref_pcontent};
for (my $i=0; $i<scalar(@pcontent); $i++)
{ if ($pcontent[$i] eq $orig)
{ $ {$ref_pcontent}[$i] = $new;
$new->parent($parent);
$orig->parent(undef);
return 1; } }
die "Didn't find $orig in $parent";
}
sub html_replace_by_meta ( $;$ )
{ my ($orig, $parent) = check_args_range(1, 2, @_);
my $meta = new HTML::Element "meta";
if (!defined $parent)
{ $parent = $orig->parent; }
return html_replace($orig, $meta, $parent);
}
sub html_replace_by_ignore ( $;$ )
{ my ($orig, $parent) = check_args_range(1, 2, @_);
my $ignore = new HTML::Element "ignore";
if (!defined $parent)
{ $parent = $orig->parent; }
return html_replace($orig, $ignore, $parent);
}
###
### Collect text elements
###
my @collected_texts;
my $collect_texts_stoppoint;
my $done_collecting;
sub collect_texts ( $;$ )
{ my ($root, $stop) = check_args_range(1, 2, @_);
# print STDERR "collect_texts: $root $stop\n";
$collect_texts_stoppoint = $stop;
$done_collecting = 0;
@collected_texts = ();
$root->traverse(\&collect_if_text); # process texts
# print STDERR "collect_texts => ", join(";;;", @collected_texts), "\n";
return @collected_texts;
}
sub collect_if_text ( $$$ )
{ my $he = (check_args(3, @_))[0]; # ignore depth and startflag arguments
if ($done_collecting)
{ return 0; }
if (!defined $he)
{ return 0; }
if (!ref $he)
{ push @collected_texts, $he;
return 0; }
if ((defined $collect_texts_stoppoint) && ($he eq $collect_texts_stoppoint))
{ $done_collecting = 1;
return 0; }
return 1;
}
###########################################################################
### Clean up parse tree
###
sub cleanup_parse_tree ( $ )
{ my ($he) = check_args(1, @_);
$he->traverse(\&delete_if_navigation, 'ignore text');
$he->traverse(\&delete_extra_spaces, 'ignore text');
$he->traverse(\&merge_dl, 'ignore text');
$he->traverse(\&reorder_dt_and_dl, 'ignore text');
return $he;
}
## Simpler version that deletes contents but not the element itself.
# sub delete_if_navigation ( $$$ )
# { my $he = (check_args(3, @_))[0]; # ignore startflag and depth
# if (($he->tag() eq "div") && ($he->attr('class') eq 'navigation'))
# { $he->delete();
# return 0; }
# else
# { return 1; }
# }
sub delete_if_navigation ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
if (($he->tag() eq "div") && (defined $he->attr('class')) && ($he->attr('class') eq 'navigation'))
{ my $ref_pcontent = $he->parent()->content();
# Don't try to modify @pcontent, which appears to be a COPY.
# my @pcontent = @{$ref_pcontent};
for (my $i = 0; $i<scalar(@{$ref_pcontent}); $i++)
{ if (${$ref_pcontent}[$i] eq $he)
{ splice(@{$ref_pcontent}, $i, 1);
last; } }
$he->delete();
return 0; }
else
{ return 1; }
}
sub delete_extra_spaces ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
my $tag = $he->tag;
if ($tag =~ /^(head|html|table|tr|ul)$/)
{ delete_child_spaces($he); }
delete_trailing_spaces($he);
return 1;
}
sub delete_child_spaces ( $ )
{ my ($he) = check_args(1, @_);
my $ref_content = $he->content();
for (my $i = 0; $i<scalar(@{$ref_content}); $i++)
{ if ($ {$ref_content}[$i] =~ /^ *$/)
{ splice(@{$ref_content}, $i, 1);
$i--; } }
}
sub delete_trailing_spaces ( $ )
{ my ($he) = check_args(1, @_);
my $ref_content = $he->content();
if (! defined $ref_content)
{ return; }
# Could also check for previous element = /^h[1-6]$/.
for (my $i = 0; $i<scalar(@{$ref_content})-1; $i++)
{ if ($ {$ref_content}[$i] =~ /^ *$/)
{ my $next_elt = $ {$ref_content}[$i+1];
if ((ref $next_elt) && ($next_elt->tag =~ /^(br|dd|dl|dt|hr|p|ul)$/))
{ splice(@{$ref_content}, $i, 1);
$i--; } } }
if ($he->tag =~ /^(dd|dt|^h[1-6]|li|p)$/)
{ my $last_elt = $ {$ref_content}[$#{$ref_content}];
if ((defined $last_elt) && ($last_elt =~ /^ *$/))
{ pop @{$ref_content}; } }
}
# LaTeX2HTML sometimes creates
# <DT>text
# <DL COMPACT><DD>text
# which should actually be:
# <DL COMPACT>
# <DT>text
# <DD>text
# Since a <DL> gets added, this ends up looking like
# <P>
# <DL>
# <DT>
# text1...
# <DL COMPACT>
# <DD>
# text2...
# dt_or_dd1...
# dt_or_dd2...
# which should become
# <P>
# <DL COMPACT>
# <DT>
# text1...
# <DD>
# text2...
# dt_or_dd1...
# dt_or_dd2...
sub reorder_dt_and_dl ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
if ($he->tag() eq "p")
{ my $ref_pcontent = $he->content();
if (defined $ref_pcontent)
{ my @pcontent = @{$ref_pcontent};
# print "reorder_dt_and_dl found a <p>\n"; $he->dump();
if ((scalar(@pcontent) >= 1)
&& (ref $pcontent[0]) && ($pcontent[0]->tag() eq "dl")
&& $pcontent[0]->implicit())
{ my $ref_dlcontent = $pcontent[0]->content();
# print "reorder_dt_and_dl found a <p> and implicit <dl>\n";
if (defined $ref_dlcontent)
{ my @dlcontent = @{$ref_dlcontent};
if ((scalar(@dlcontent) >= 1)
&& (ref $dlcontent[0]) && ($dlcontent[0]->tag() eq "dt"))
{ my $ref_dtcontent = $dlcontent[0]->content();
# print "reorder_dt_and_dl found a <p>, implicit <dl>, and <dt>\n";
if (defined $ref_dtcontent)
{ my @dtcontent = @{$ref_dtcontent};
if ((scalar(@dtcontent) > 0)
&& (ref $dtcontent[$#dtcontent])
&& ($dtcontent[$#dtcontent]->tag() eq "dl"))
{ my $ref_dl2content = $dtcontent[$#dtcontent]->content();
# print "reorder_dt_and_dl found a <p>, implicit <dl>, <dt>, and <dl>\n";
if (defined $ref_dl2content)
{ my @dl2content = @{$ref_dl2content};
if ((scalar(@dl2content) > 0)
&& (ref ($dl2content[0]))
&& ($dl2content[0]->tag() eq "dd"))
{
# print "reorder_dt_and_dl found a <p>, implicit <dl>, <dt>, <dl>, and <dd>\n";
# print STDERR "CHANGING\n"; $he->dump();
html_replace_by_ignore($dtcontent[$#dtcontent]);
splice(@{$ref_dlcontent}, 1, 0, @dl2content);
# print STDERR "CHANGED TO:\n"; $he->dump();
return 0; # don't traverse children
} } } } } } } } }
return 1;
}
# If we find a paragraph that looks like
# <P>
# <HR>
# <UL>
# then accumulate its links into a contents_list and delete the paragraph.
sub process_if_child_links ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
if ($he->tag() eq "p")
{ my $ref_content = $he->content();
if (defined $ref_content)
{ my @content = @{$ref_content};
if ((scalar(@content) == 2)
&& (ref $content[0]) && $content[0]->tag() eq "hr"
&& (ref $content[1]) && $content[1]->tag() eq "ul")
{ process_child_links($he);
$he->delete();
return 0; } } }
return 1;
}
# If we find
# <H4>
# "Footnotes"
# <DL>
# <DT>
# <A NAME="foot560">
# "...borrow"
# <A HREF="refcountsInPython.html#tex2html2" NAME="foot560">
# "1.2"
# <DD>
# "The metaphor of ``borrowing'' a reference is not completely correct: the owner still has a copy of the reference. "
# ...
# then record the footnote information and delete the section and list.
my $process_if_footnotes_expect_dl_next = 0;
sub process_if_footnotes ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
if (($he->tag() eq "h4")
&& has_single_content_string($he)
&& ($ {$he->content}[0] eq "Footnotes"))
{ html_replace_by_ignore($he);
$process_if_footnotes_expect_dl_next = 1;
return 0; }
if ($process_if_footnotes_expect_dl_next && ($he->tag() eq "dl"))
{ my $ref_content = $he->content();
if (defined $ref_content)
{ $process_if_footnotes_expect_dl_next = 0;
my @content = @{$ref_content};
for (my $i=0; $i<$#content; $i+=2)
{ my $he_dt = $content[$i];
my $he_dd = $content[$i+1];
if (($he_dt->tag ne "dt") || ($he_dd->tag ne "dd"))
{ $he->dump;
die "expected <DT> and <DD> at positions $i and ", $i+1; }
my @dt_content = @{$he_dt->content()};
if ((scalar(@dt_content) != 2)
|| ($dt_content[0]->tag ne "a")
|| ($dt_content[1]->tag ne "a"))
{ $he_dt->dump;
die "Expected 2 anchors as content of <DT>"; }
my ($dt1_name, $dt1_href, $dt1_content) = anchor_info($dt_content[0]);
my ($dt2_name, $dt2_href, $dt2_content) = anchor_info($dt_content[0]);
# unused: $dt1_href, $dt1_content, $dt2_href, $dt2_content
if ($dt1_name ne $dt2_name)
{ $he_dt->dump;
die "Expected identical names for anchors"; }
html_replace_by_ignore($he_dd);
$he_dd->tag("div"); # has no effect
$footnotes{$dt1_name} = $he_dd; }
html_replace_by_ignore($he);
return 0; } }
if ($process_if_footnotes_expect_dl_next)
{ $he->dump;
die "Expected <DL> for footnotes next"; }
return 1;
}
## Merge two adjacent paragraphs containing <DL> items, such as:
# <P>
# <DL>
# <DT>
# ...
# <DD>
# ...
# <P>
# <DL>
# <DT>
# ...
# <DD>
# ...
sub merge_dl ( $$$ )
{ my ($he, $startflag) = (check_args(3, @_))[0,1]; # ignore depth argument
if (!$startflag)
{ return; }
my $ref_content = $he->content;
if (!defined $ref_content)
{ return; }
my $i = 0;
while ($i < scalar(@{$ref_content})-1)
{ my $p1 = $ {$ref_content}[$i];
if ((ref $p1) && ($p1->tag eq "p")
&& has_single_content_with_tag($p1, "dl"))
{ my $dl1 = $ {$p1->content}[0];
# In this loop, rhs, not lhs, of < comparison changes,
# because we are removing elements from the content of $he.
while ($i < scalar(@{$ref_content})-1)
{ my $p2 = $ {$ref_content}[$i+1];
if (!((ref $p2) && ($p2->tag eq "p")
&& has_single_content_with_tag($p2, "dl")))
{ last; }
# Merge these two elements.
splice(@{$ref_content}, $i+1, 1); # remove $p2
my $dl2 = $ {$p2->content}[0];
$dl1->push_content(@{$dl2->content}); # put $dl2's content in $dl1
}
# extra increment because next element isn't a candidate for $p1
$i++; }
$i++; }
return 1;
}
###########################################################################
### Testing
###
sub test ( $$ )
{ my ($action, $file) = check_args(2, @_);
# General testing
if (($action eq "view") || ($action eq ""))
{ # # $file = "/homes/gws/mernst/www/links.html";
# # $file = "/homes/gws/mernst/www/index.html";
# # $file = "/homes/fish/mernst/java/gud/doc/manual.html";
# # $file = "/projects/cecil/cecil/doc/manuals/stdlib-man/stdlib/stdlib.html";
# # $file = "/homes/fish/mernst/tmp/python-doc/html/index.html";
# $file = "/homes/fish/mernst/tmp/python-doc/html/api/complexObjects.html";
my $tree = file_to_tree($file);
## Testing
# print STDERR $tree->as_HTML;
$tree->dump();
# print STDERR $tree->tag(), "\n";
# print STDERR @{$tree->content()}, "\n";
#
# for (@{ $tree->extract_links(qw(a img)) }) {
# my ($link, $linkelem) = @$_;
# print STDERR "$link ", $linkelem->as_HTML;
# }
#
# print STDERR @{$tree->extract_links()}, "\n";
# my @top_level_elts = @{$tree->content()};
# if scalar(@{$tree->content()})
return;
}
elsif ($action eq "raw")
{ my $tree = new HTML::TreeBuilder;
$tree->ignore_unknown(1);
# $tree->warn(1);
$tree->parse_file($file);
$tree->dump();
# cleanup_parse_tree($tree);
# $tree->dump();
return;
}
# Test dealing with a section.
elsif ($action eq "section")
{ # my $file;
# $file = "/homes/fish/mernst/tmp/python-doc/html/api/intro.html";
# $file = "/homes/fish/mernst/tmp/python-doc/html/api/includes.html";
# $file = "/homes/fish/mernst/tmp/python-doc/html/api/complexObjects.html";
process_section_file($file, 0, "Title");
}
# Test dealing with many sections
elsif (0)
{ my @files = ("/homes/fish/mernst/tmp/python-doc/html/api/about.html",
"/homes/fish/mernst/tmp/python-doc/html/api/abstract.html",
"/homes/fish/mernst/tmp/python-doc/html/api/api.html",
"/homes/fish/mernst/tmp/python-doc/html/api/cObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/complexObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/concrete.html",
# "/homes/fish/mernst/tmp/python-doc/html/api/contents.html",
"/homes/fish/mernst/tmp/python-doc/html/api/countingRefs.html",
"/homes/fish/mernst/tmp/python-doc/html/api/debugging.html",
"/homes/fish/mernst/tmp/python-doc/html/api/dictObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/embedding.html",
"/homes/fish/mernst/tmp/python-doc/html/api/exceptionHandling.html",
"/homes/fish/mernst/tmp/python-doc/html/api/exceptions.html",
"/homes/fish/mernst/tmp/python-doc/html/api/fileObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/floatObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/front.html",
"/homes/fish/mernst/tmp/python-doc/html/api/fundamental.html",
# "/homes/fish/mernst/tmp/python-doc/html/api/genindex.html",
"/homes/fish/mernst/tmp/python-doc/html/api/importing.html",
"/homes/fish/mernst/tmp/python-doc/html/api/includes.html",
"/homes/fish/mernst/tmp/python-doc/html/api/index.html",
"/homes/fish/mernst/tmp/python-doc/html/api/initialization.html",
"/homes/fish/mernst/tmp/python-doc/html/api/intObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/intro.html",
"/homes/fish/mernst/tmp/python-doc/html/api/listObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/longObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/mapObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/mapping.html",
"/homes/fish/mernst/tmp/python-doc/html/api/newTypes.html",
"/homes/fish/mernst/tmp/python-doc/html/api/node24.html",
"/homes/fish/mernst/tmp/python-doc/html/api/noneObject.html",
"/homes/fish/mernst/tmp/python-doc/html/api/number.html",
"/homes/fish/mernst/tmp/python-doc/html/api/numericObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/object.html",
"/homes/fish/mernst/tmp/python-doc/html/api/objects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/os.html",
"/homes/fish/mernst/tmp/python-doc/html/api/otherObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/processControl.html",
"/homes/fish/mernst/tmp/python-doc/html/api/refcountDetails.html",
"/homes/fish/mernst/tmp/python-doc/html/api/refcounts.html",
"/homes/fish/mernst/tmp/python-doc/html/api/sequence.html",
"/homes/fish/mernst/tmp/python-doc/html/api/sequenceObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/standardExceptions.html",
"/homes/fish/mernst/tmp/python-doc/html/api/stringObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/threads.html",
"/homes/fish/mernst/tmp/python-doc/html/api/tupleObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/typeObjects.html",
"/homes/fish/mernst/tmp/python-doc/html/api/types.html",
"/homes/fish/mernst/tmp/python-doc/html/api/utilities.html",
"/homes/fish/mernst/tmp/python-doc/html/api/veryhigh.html");
for my $file (@files)
{ print STDERR "\n", "=" x 75, "\n", "$file:\n";
process_section_file($file, 0, "Title");
}
}
# Test dealing with index.
elsif ($action eq "index")
{ # my $file;
# $file = "/homes/fish/mernst/tmp/python-doc/html/api/genindex.html";
process_index_file($file, "\@cindex");
print_index_info();
}
else
{ die "Unrecognized action `$action'"; }
}
###########################################################################
### Main loop
###
sub process_contents_file ( $ )
{ my ($file) = check_args(1, @_);
# could also use File::Basename
my $info_file = $file;
$info_file =~ s/(\/?index)?\.html$//;
if ($info_file eq "")
{ chomp($info_file = `pwd`); }
$info_file =~ s/^.*\///; # not the most efficient way to remove dirs
$html_directory = $file;
$html_directory =~ s/(\/|^)[^\/]+$/$1/;
my $texi_file = "$info_file.texi";
open(TEXI, ">$texi_file");
print TEXI "\\input texinfo \@c -*-texinfo-*-\n";
print TEXI "\@c %**start of header\n";
print TEXI "\@setfilename $info_file\n";
# 2. Summary Description and Copyright
# The "Summary Description and Copyright" segment describes the
# document and contains the copyright notice and copying permissions
# for the Info file. The segment must be enclosed between `@ifinfo'
# and `@end ifinfo' commands so that the formatters place it only in
# the Info file.
#
# The summary description and copyright segment does not appear in the
# printed document.
#
# @ifinfo
# This is a short example of a complete Texinfo file.
#
# Copyright @copyright{} 1990 Free Software Foundation, Inc.
# @end ifinfo
# 3. Title and Copyright
# The "Title and Copyright" segment contains the title and copyright
# pages and copying permissions for the printed manual. The segment
# must be enclosed between `@titlepage' and `@end titlepage'
# commands. The title and copyright page appear only in the printed
# manual.
#
# The titlepage segment does not appear in the Info file.
#
# @titlepage
# @sp 10
# @comment The title is printed in a large font.
# @center @titlefont{Sample Title}
#
# @c The following two commands start the copyright page.
# @page
# @vskip 0pt plus 1filll
# Copyright @copyright{} 1990 Free Software Foundation, Inc.
# @end titlepage
# 4. `Top' Node and Master Menu
# The "Master Menu" contains a complete menu of all the nodes in the
# whole Info file. It appears only in the Info file, in the `Top'
# node.
#
# The `Top' node contains the master menu for the Info file. Since a
# printed manual uses a table of contents rather than a menu, the master
# menu appears only in the Info file.
#
# @node Top, First Chapter, , (dir)
# @comment node-name, next, previous, up
#
# @menu
# * First Chapter:: The first chapter is the
# only chapter in this sample.
# * Concept Index:: This index has two entries.
# @end menu
$current_ref_tdf = [ "Top", 0, $ARGV[0] ];
process_section_file($file, 0, "Top");
while (scalar(@contents_list))
{ $current_ref_tdf = shift @contents_list;
process_section_file($ {$current_ref_tdf}[2], $ {$current_ref_tdf}[1], $ {$current_ref_tdf}[0]);
}
print TEXI "\n";
for my $indextitle (@index_titles)
{ print TEXI "\@node $indextitle\n";
print TEXI "\@unnumbered $indextitle\n";
print TEXI "\@printindex $ {$index_info{$indextitle}}[1]\n";
print TEXI "\n"; }
print TEXI "\@contents\n";
print TEXI "\@bye\n";
close(TEXI);
}
# This needs to be last so global variable initializations are reached.
if (scalar(@ARGV) == 0)
{ die "No arguments supplied to html2texi.pl"; }
if ($ARGV[0] eq "-test")
{ my @test_args = @ARGV[1..$#ARGV];
if (scalar(@test_args) == 0)
{ test("", "index.html"); }
elsif (scalar(@test_args) == 1)
{ test("", $test_args[0]); }
elsif (scalar(@test_args) == 2)
{ test($test_args[0], $test_args[1]); }
else
{ die "Too many test arguments passed to html2texi: ", join(" ", @ARGV); }
exit();
}
if (scalar(@ARGV) != 1)
{ die "Pass one argument, the main/contents page"; }
process_contents_file($ARGV[0]);
# end of html2texi.pl