mirror of
https://github.com/mozilla/gecko-dev.git
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433 lines
11 KiB
Perl
Executable File
433 lines
11 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# -*- Mode: perl; tab-width: 4; indent-tabs-mode: nil; -*-
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#
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# Preprocessor
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# Version 1.0
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#
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# Copyright (c) 2002, 2003 by Ian Hickson
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Thanks to bryner and bsmedberg for suggestions.
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use strict;
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# takes as arguments the files to process
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# defaults to stdin
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# output to stdout
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my $stack = new stack;
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# command line arguments
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my @includes;
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while ($_ = $ARGV[0], defined($_) && /^-./) {
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shift;
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last if /^--$/os;
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if (/^-D(.*)$/os) {
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for ($1) {
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if (/^(\w+)=(.*)$/os) {
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$stack->define($1, $2);
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} elsif (/^(\w+)$/os) {
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$stack->define($1, 1);
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} else {
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die "$0: invalid argument to -D: $_\n";
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}
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}
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} elsif (/^-F(.*)$/os) {
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for ($1) {
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if (/^(\w+)$/os) {
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$stack->filter($1, 1);
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} else {
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die "$0: invalid argument to -F: $_\n";
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}
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}
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} elsif (/^-I(.*)$/os) {
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push(@includes, $1);
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} elsif (/^-E$/os) {
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foreach (keys %ENV) {
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$stack->define($_, $ENV{$_});
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}
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} else {
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die "$0: invalid argument: $_\n";
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}
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}
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unshift(@ARGV, '-') unless @ARGV;
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unshift(@ARGV, @includes);
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# do the work
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foreach (@ARGV) { include($stack, $_); }
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exit(0);
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########################################################################
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package main;
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use File::Spec 0.8;
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use File::Spec::Unix; # on all platforms, because the #include syntax is unix-based
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sub include {
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my($stack, $filename) = @_;
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my $directory = $stack->{'variables'}->{'DIRECTORY'};
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if ($filename ne '-') {
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$filename = File::Spec->rel2abs($filename, $directory);
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my($volume, $path) = File::Spec->splitpath($filename);
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$directory = File::Spec->catpath($volume, $path, '');
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}
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local $stack->{'variables'}->{'DIRECTORY'} = $directory;
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local $stack->{'variables'}->{'FILE'} = $filename;
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local $stack->{'variables'}->{'LINE'} = 0;
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local *FILE;
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open(FILE, $filename) or die "Couldn't open $filename: $!\n";
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while (<FILE>) {
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# on cygwin, line endings are screwed up, so normalise them.
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s/[\x0D\x0A]+$/\n/os if $^O eq 'cygwin';
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$stack->newline;
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if (/^\#([a-z]+)\n?$/os) { # argumentless processing instruction
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process($stack, $1);
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} elsif (/^\#([a-z]+)\s(.*?)\n?$/os) { # processing instruction with arguments
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process($stack, $1, $2);
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} elsif (/^\#\n?/os) { # comment
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# ignore it
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} elsif ($stack->enabled) {
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# print it, including any newlines
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print filtered($stack, $_);
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}
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}
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close(FILE);
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}
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sub process {
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my($stack, $instruction, @arguments) = @_;
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my $method = 'preprocessor'->can($instruction);
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if (not defined($method)) {
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fatal($stack, 'unknown instruction', $instruction);
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}
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eval { &$method($stack, @arguments) };
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if ($@) {
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fatal($stack, "error evaluating $instruction:", $@);
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}
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}
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sub filtered {
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my($stack, $text) = @_;
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foreach my $filter (sort keys %{$stack->{'filters'}}) {
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next unless $stack->{'filters'}->{$filter};
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my $method = 'filter'->can($filter);
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if (not defined($method)) {
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fatal($stack, 'unknown filter', $filter);
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}
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$text = eval { &$method($stack, $text) };
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if ($@) {
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fatal($stack, "error using $filter:", $@);
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}
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}
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return $text;
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}
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sub fatal {
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my $stack = shift;
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my $filename = $stack->{'variables'}->{'FILE'};
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local $" = ' ';
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print STDERR "$0:$filename:$.: @_\n";
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exit(1);
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}
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########################################################################
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package stack;
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sub new {
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return bless {
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'variables' => {
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# %ENV,
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'LINE' => 0, # the line number in the source file
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'DIRECTORY' => '', # current directory
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'FILE' => '', # source filename
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'1' => 1, # for convenience
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},
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'filters' => {
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# filters
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},
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'values' => [], # the value of the last condition evaluated at the nth lewel
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'lastPrinting' => [], # whether we were printing at the n-1th level
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'printing' => 1, # whether we are currently printing at the Nth level
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};
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}
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sub newline {
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my $self = shift;
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$self->{'variables'}->{'LINE'}++;
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}
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sub define {
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my $self = shift;
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my($variable, $value) = @_;
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die "not a valid variable name: '$variable'\n" if $variable =~ m/\W/;
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$self->{'variables'}->{$variable} = $value;
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}
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sub defined {
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my $self = shift;
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my($variable) = @_;
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die "not a valid variable name: '$variable'\n" if $variable =~ m/\W/;
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return defined($self->{'variables'}->{$variable});
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}
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sub undefine {
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my $self = shift;
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my($variable) = @_;
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die "not a valid variable name: '$variable'\n" if $variable =~ m/\W/;
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delete($self->{'variables'}->{$variable});
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}
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sub get {
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my $self = shift;
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my($variable, $required) = @_;
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die "not a valid variable name: '$variable'\n" if $variable =~ m/\W/;
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my $value = $self->{'variables'}->{$variable};
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if (defined($value)) {
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return $value;
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} else {
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die "variable '$variable' is not defined\n" if $required;
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return '';
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}
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}
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sub push {
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my $self = shift;
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my($value) = @_;
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push(@{$self->{'values'}}, $value);
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push(@{$self->{'lastPrinting'}}, $self->{'printing'});
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$self->{'printing'} = $value && $self->{'printing'};
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}
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sub pop {
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my $self = shift;
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$self->{'printing'} = pop(@{$self->{'lastPrinting'}});
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return pop(@{$self->{'values'}});
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}
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sub enabled {
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my $self = shift;
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return $self->{'printing'};
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}
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sub disabled {
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my $self = shift;
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return not $self->{'printing'};
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}
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sub filter {
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my $self = shift;
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my($filter, $value) = @_;
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die "not a valid filter name: '$filter'\n" if $filter =~ m/\W/;
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$self->{'filters'}->{$filter} = $value;
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}
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sub expand {
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my $self = shift;
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my($line) = @_;
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$line =~ s/__(\w+)__/$self->get($1)/gose;
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return $line;
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}
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########################################################################
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package preprocessor;
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sub define {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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my $argument = shift;
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for ($argument) {
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/^(\w+)\s(.*)$/os && do {
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return $stack->define($1, $2);
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};
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/^(\w+)$/os && do {
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return $stack->define($1, 1);
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};
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die "invalid argument: '$_'\n";
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}
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}
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sub undef {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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$stack->undefine(@_);
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}
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sub ifdef {
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my $stack = shift;
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die "argument expected\n" unless @_;
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$stack->push($stack->defined(@_));
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}
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sub ifndef {
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my $stack = shift;
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die "argument expected\n" unless @_;
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$stack->push(not $stack->defined(@_));
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}
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sub if {
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my $stack = shift;
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die "argument expected\n" unless @_;
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my $argument = shift;
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for ($argument) {
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/^(\w+)==(.*)$/os && do {
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# equality
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return $stack->push($stack->get($1) eq $2);
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};
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/^(\w+)!=(.*)$/os && do {
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# inequality
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return $stack->push($stack->get($1) ne $2);
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};
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/^(\w+)$/os && do {
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# true value
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return $stack->push($stack->get($1));
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};
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/^!(\w+)$/os && do {
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# false value
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return $stack->push(not $stack->get($1));
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};
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die "invalid argument: '$_'\n";
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}
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}
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sub else {
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my $stack = shift;
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die "argument unexpected\n" if @_;
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$stack->push(not $stack->pop);
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}
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sub elif {
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my $stack = shift;
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die "argument expected\n" unless @_;
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if ($stack->pop) {
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$stack->push(0);
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} else {
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&if($stack, @_);
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}
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}
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sub elifdef {
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my $stack = shift;
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die "argument expected\n" unless @_;
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if ($stack->pop) {
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$stack->push(0);
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} else {
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&ifdef($stack, @_);
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}
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}
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sub elifndef {
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my $stack = shift;
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die "argument expected\n" unless @_;
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if ($stack->pop) {
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$stack->push(0);
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} else {
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&ifndef($stack, @_);
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}
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}
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sub endif {
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my $stack = shift;
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die "argument unexpected\n" if @_;
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$stack->pop;
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}
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sub error {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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my $line = $stack->expand(@_);
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die "$line\n";
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}
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sub expand {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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my $line = $stack->expand(@_);
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print "$line\n";
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}
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sub literal {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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my $line = shift;
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print "$line\n";
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}
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sub include {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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main::include($stack, File::Spec->catpath(File::Spec::Unix->splitpath(@_)));
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}
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sub filter {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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foreach (split(/\s/os, shift)) {
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$stack->filter($_, 1);
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}
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}
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sub unfilter {
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my $stack = shift;
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return if $stack->disabled;
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die "argument expected\n" unless @_;
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foreach (split(/\s/os, shift)) {
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$stack->filter($_, 0);
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}
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}
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########################################################################
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package filter;
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sub spaces {
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my($stack, $text) = @_;
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$text =~ s/ +/ /gos; # middle spaces
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$text =~ s/^ //gos; # start spaces
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$text =~ s/ (\n?)$/$1/gos; # end spaces
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return $text;
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}
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sub slashslash {
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my($stack, $text) = @_;
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$text =~ s|//.*?(\n?)$|$1|gos;
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return $text;
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}
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sub substitution {
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my($stack, $text) = @_;
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$text =~ s/@(\w+)@/$stack->get($1, 1)/gose;
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return $text;
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}
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sub attemptSubstitution {
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my($stack, $text) = @_;
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$text =~ s/@(\w+)@/$stack->get($1, 0)/gose;
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return $text;
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}
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########################################################################
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