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#!/usr/bin/perl -w
# Copyright (C) 2008 Julien Chaffraix <jchaffraix@webkit.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
use strict;
package InFilesParser;
my $isParsingCommonParameters;
my $hasStartedParsing;
# Helper functions
sub trimComment
{
my $string = shift;
$string =~ s/#.+$//;
chomp($string);
return $string;
}
sub trimWS
{
my $string = shift;
$string =~ s/^\s+//;
$string =~ s/\s+$//;
chomp($string);
return $string;
}
sub trimQuoteAndWS
{
my $string = shift;
$string =~ s/\"([^\"]+)\"/$1/;
return trimWS($string);
}
# Default constructor
sub new
{
my $object = shift;
my $reference = { };
# Initialize the parser.
$isParsingCommonParameters = 1;
$hasStartedParsing = 0;
bless($reference, $object);
return $reference;
}
# parse take 3 attributes:
# - the filestream to read from (the caller has to open / close it).
# - the commonParameterHandler called when parsing the first part of the file with the parameter and the value.
# - the perTagHandler called for each optional parameter with the element name, the parameter and its value.
# If no parameter were provided, it is called once with an empty parameter and value.
sub parse($)
{
my $object = shift;
my $fileStream = shift; # IO::File only
my $commonParameterHandler = shift;
my $perTagHandler = shift;
foreach (<$fileStream>) {
# Empty line, change from common parameter part
# to per tag part if we have started parsing.
if (/^$/) {
if ($hasStartedParsing) {
$isParsingCommonParameters = 0;
}
next;
}
# There may be a few empty lines at the beginning of the file
# so detect the first non empty line which starts the common
# parameters part.
$hasStartedParsing = 1;
if (/^#/) {
next;
}
$_ = trimComment($_);
if ($isParsingCommonParameters) {
my ($name, $value) = split '=', $_;
$name = trimWS($name);
if (defined($value)) {
$value = trimQuoteAndWS($value);
} else {
# We default to 1 as it eases the syntax.
$value = "1";
}
&$commonParameterHandler($name, $value);
} else {
# Parsing per-tag parameters.
# Split the tag name ($1) from the optionnal parameter(s) ($2)
/^(\S+)\s*(.*)$/;
my $elementName = $1;
if ($2) {
my @options = split "," , $2;
my ($option, $value);
for (my $i = 0; $i < @options; ++$i) {
($option, $value) = split "=", $options[$i];
$option = trimWS($option);
if (defined($value)) {
$value = trimQuoteAndWS($value);
} else {
# We default to 1 as it eases the syntax.
$value = "1";
}
&$perTagHandler($elementName, $option, $value);
}
} else {
# No parameter was given so call it with empty strings.
&$perTagHandler($elementName, "", "");
}
}
}
}
1;
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