mirror of https://github.com/apache/jclouds.git
Issue 36: incomplete, but started on the parser
git-svn-id: http://jclouds.googlecode.com/svn/trunk@845 3d8758e0-26b5-11de-8745-db77d3ebf521
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adrian.f.cole
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#!/usr/bin/perl
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####
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#
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# Copyright (C) 2009 Adrian Cole <adrian@jclouds.org>
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#
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# ====================================================================
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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####
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# Parse EC2
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#
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# Builds an object tree used to create a REST service for the current EC2 api.
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#
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# Prerequisites:
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# * download and install http://search.cpan.org/~petek/HTML-Tree/
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# 1. download and extract the archive
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# 2. cd to that location
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# 3. perl MakeFile.PL
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# 4. sudo make install
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#
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# Usage:
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# * execute the script with no arguments. If you've downloaded the content locally, adjust refUrl and parse
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#
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# Tips: use $tree->dump to view the current html tree and print Dumper($object) to see a reference
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#
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# Author: Adrian Cole
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####
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use strict;
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use HTML::TreeBuilder 2.97;
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use LWP::UserAgent;
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use Data::Dumper;
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my $refUrl = "http://docs.amazonwebservices.com/AWSEC2/latest/APIReference";
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#my $refUrl = "/tmp/scrape";
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my $appUrl = "${refUrl}/OperationList-query.html";
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my $global_package = "org.jclouds.aws.ec2";
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my $commands_package = $global_package . ".commands";
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my $response_package = $commands_package . ".response";
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my $options_package = $commands_package . ".options";
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my $xml_package = $global_package . ".xml";
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sub parse_file {
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my $file = $_[0] || die "What File?";
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my $tree = HTML::TreeBuilder->new();
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$tree->parse_file($file);
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$tree->eof;
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return $tree;
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}
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sub parse {
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# return parse_file(shift);
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return parse_url(shift);
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}
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sub parse_url {
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my $url = $_[0] || die "What URL?";
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my $response =
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LWP::UserAgent->new->request( HTTP::Request->new( GET => $url ) );
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unless ( $response->is_success ) {
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warn "Couldn't get $url: ", $response->status_line, "\n";
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return;
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}
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my $tree = HTML::TreeBuilder->new();
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$tree->parse( $response->content );
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$tree->eof;
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return $tree;
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}
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sub build_commands {
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my $tree = parse( $_[0] );
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#$tree->dump;
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my @out;
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foreach my $link (
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( $tree->look_down( '_tag', 'div', 'class', 'itemizedlist' ) ) )
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{
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my $package = $link->look_down( '_tag', 'b' );
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$_ = $package->as_text;
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s/ //g;
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my $packageName = lc();
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my @commands;
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foreach my $class ( $link->look_down( '_tag', 'a' ) ) {
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my $simpleName = $class->attr('title');
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my $command = {
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simpleName => $simpleName,
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className => $commands_package . $simpleName,
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see => ["${refUrl}/ApiReference-query-${simpleName}.html"],
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response => {
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simpleName => $simpleName . "Response",
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className => $response_package . $simpleName . "Response",
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see => [
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"${refUrl}/ApiReference-ItemType-${simpleName}Response.html"
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]
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},
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options => {
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simpleName => $simpleName . "Options",
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className => $options_package . $simpleName . "Options",
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see =>
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["${refUrl}/ApiReference-ItemType-${simpleName}.html"]
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},
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handler => {
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simpleName => $simpleName . "Handler",
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className => $xml_package . $simpleName . "Handler",
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see => [
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"${refUrl}/ApiReference-ItemType-${simpleName}Response.html"
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]
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}
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};
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$command = build_command($command);
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push @commands, $command;
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push @out,
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{
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name => $packageName,
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commands => [@commands],
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};
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}
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}
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$tree->eof;
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$tree->delete;
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return @out;
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}
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sub build_app {
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my $url = shift;
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my @packages = build_commands($url);
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return {
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see => [$url],
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packages => [@packages]
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};
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}
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sub build_command {
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my $command = $_[0];
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print "parsing $$command{see}[0]...\n";
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my $tree = parse( $$command{see}[0] );
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#$tree->dump;
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my ${requestExampleDiv} =
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$tree->look_down( '_tag', 'h3', 'id',
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"ApiReference-query-$$command{simpleName}-Example-Request-1" )
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->look_up( '_tag', 'div', 'class', 'section' );
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$$command{options}->{example} = ${requestExampleDiv}->as_HTML();
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my @{parameterRows} = $tree->look_down(
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'_tag', 'h2',
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'id', "ApiReference-query-$$command{simpleName}-Request"
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)->look_up( '_tag', 'div', 'class', 'section' )
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->look_down( '_tag', 'tbody' )->look_down( '_tag', 'tr' );
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my @optionalParameters;
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my @requiredParameters;
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foreach my $parameterRow ( @{parameterRows} ) {
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my @{row} = $parameterRow->look_down( '_tag', 'td' );
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my %param;
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$param{name} = ${row}[0]->as_text();
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my @{data} = ${row}[1]->look_down( '_tag', 'p' );
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foreach ( @{data} ) {
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$_ = $_->as_text();
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if (s/Default: //) {
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$param{param} = $_;
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}
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elsif (s/Type: //) {
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$param{type} = $_;
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}
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else {
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$param{desc} = $_;
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}
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}
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if ( ${row}[2]->as_text() =~ /No/ ) {
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push @optionalParameters, {%param};
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}
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else {
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push @requiredParameters, {%param};
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}
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}
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$$command{options}->{parameters} = [@optionalParameters];
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$command->{parameters} = [@requiredParameters];
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my ${responseExampleDiv} =
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$tree->look_down( '_tag', 'h3', 'id',
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"ApiReference-query-$$command{simpleName}-Example-Response-1" )
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->look_up( '_tag', 'div', 'class', 'section' );
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$$command{handler}->{example} = ${responseExampleDiv}->as_HTML();
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$command = build_response($command);
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my @{seeAlsoA} =
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$tree->look_down( '_tag', 'div', 'class', 'itemizedlist' )
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->look_down( '_tag', 'a' );
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foreach ( @{seeAlsoA} ) {
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push @{ $command->{see} }, $_->as_text();
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}
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$tree->eof;
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$tree->delete;
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print_command($command);
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return $command;
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}
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sub build_response {
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my $command = $_[0];
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my $tree = parse( $$command{response}->{see}[0] );
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#$tree->dump;
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$tree->eof;
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my @{fields};
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my @{fieldRows} =
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${tree}->look_down( '_tag', 'tbody' )->look_down( '_tag', 'tr' );
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foreach ( @{fieldRows} ) {
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my @row = $_->look_down( '_tag', 'td' );
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my %field;
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$field{name} = ${row}[0]->as_text();
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my @{data} = ${row}[1]->look_down( '_tag', 'p' );
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foreach ( @{data} ) {
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$_ = $_->as_text();
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if (s/Type: //) {
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$field{type} = $_;
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}
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else {
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$field{desc} = $_;
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}
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}
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push @fields, {%field};
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}
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$command->{response}->{fields} = [@fields];
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$tree->delete;
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return $command;
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}
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sub print_command {
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my $classRef = shift;
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print " $$classRef{simpleName}\n";
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print Dumper($_) . "\n" foreach ( @{ $classRef->{parameters} } );
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}
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sub print_app {
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my $app = build_app($appUrl);
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print Dumper($app);
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my @packages = @{ $$app{packages} };
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foreach my $packageRef (@packages) {
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my @commands = @{ $$packageRef{commands} };
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print_command foreach (@commands);
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}
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}
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# start app!
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print_app();
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