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jquery.i18n.parser.js
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jquery.i18n.parser.js
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/*!
* jQuery Internationalization library
*
* Copyright (C) 2011-2013 Santhosh Thottingal, Neil Kandalgaonkar
*
* jquery.i18n is dual licensed GPLv2 or later and MIT. You don't have to do
* anything special to choose one license or the other and you don't have to
* notify anyone which license you are using. You are free to use
* UniversalLanguageSelector in commercial projects as long as the copyright
* header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
*
* @licence GNU General Public Licence 2.0 or later
* @licence MIT License
*/
( function ( $ ) {
'use strict';
var MessageParser = function ( options ) {
this.options = $.extend( {}, $.i18n.parser.defaults, options );
this.language = $.i18n.languages[ String.locale ] || $.i18n.languages[ 'default' ];
this.emitter = $.i18n.parser.emitter;
};
MessageParser.prototype = {
constructor: MessageParser,
simpleParse: function ( message, parameters ) {
return message.replace( /\$(\d+)/g, function ( str, match ) {
var index = parseInt( match, 10 ) - 1;
return parameters[ index ] !== undefined ? parameters[ index ] : '$' + match;
} );
},
parse: function ( message, replacements ) {
if ( message.indexOf( '{{' ) < 0 ) {
return this.simpleParse( message, replacements );
}
this.emitter.language = $.i18n.languages[ $.i18n().locale ] ||
$.i18n.languages[ 'default' ];
return this.emitter.emit( this.ast( message ), replacements );
},
ast: function ( message ) {
var pipe, colon, backslash, anyCharacter, dollar, digits, regularLiteral,
regularLiteralWithoutBar, regularLiteralWithoutSpace, escapedOrLiteralWithoutBar,
escapedOrRegularLiteral, templateContents, templateName, openTemplate,
closeTemplate, expression, paramExpression, result,
pos = 0;
// Try parsers until one works, if none work return null
function choice( parserSyntax ) {
return function () {
var i, result;
for ( i = 0; i < parserSyntax.length; i++ ) {
result = parserSyntax[ i ]();
if ( result !== null ) {
return result;
}
}
return null;
};
}
// Try several parserSyntax-es in a row.
// All must succeed; otherwise, return null.
// This is the only eager one.
function sequence( parserSyntax ) {
var i, res,
originalPos = pos,
result = [];
for ( i = 0; i < parserSyntax.length; i++ ) {
res = parserSyntax[ i ]();
if ( res === null ) {
pos = originalPos;
return null;
}
result.push( res );
}
return result;
}
// Run the same parser over and over until it fails.
// Must succeed a minimum of n times; otherwise, return null.
function nOrMore( n, p ) {
return function () {
var originalPos = pos,
result = [],
parsed = p();
while ( parsed !== null ) {
result.push( parsed );
parsed = p();
}
if ( result.length < n ) {
pos = originalPos;
return null;
}
return result;
};
}
// Helpers -- just make parserSyntax out of simpler JS builtin types
function makeStringParser( s ) {
var len = s.length;
return function () {
var result = null;
if ( message.slice( pos, pos + len ) === s ) {
result = s;
pos += len;
}
return result;
};
}
function makeRegexParser( regex ) {
return function () {
var matches = message.slice( pos ).match( regex );
if ( matches === null ) {
return null;
}
pos += matches[ 0 ].length;
return matches[ 0 ];
};
}
pipe = makeStringParser( '|' );
colon = makeStringParser( ':' );
backslash = makeStringParser( '\\' );
anyCharacter = makeRegexParser( /^./ );
dollar = makeStringParser( '$' );
digits = makeRegexParser( /^\d+/ );
regularLiteral = makeRegexParser( /^[^{}[\]$\\]/ );
regularLiteralWithoutBar = makeRegexParser( /^[^{}[\]$\\|]/ );
regularLiteralWithoutSpace = makeRegexParser( /^[^{}[\]$\s]/ );
// There is a general pattern:
// parse a thing;
// if it worked, apply transform,
// otherwise return null.
// But using this as a combinator seems to cause problems
// when combined with nOrMore().
// May be some scoping issue.
function transform( p, fn ) {
return function () {
var result = p();
return result === null ? null : fn( result );
};
}
// Used to define "literals" within template parameters. The pipe
// character is the parameter delimeter, so by default
// it is not a literal in the parameter
function literalWithoutBar() {
var result = nOrMore( 1, escapedOrLiteralWithoutBar )();
return result === null ? null : result.join( '' );
}
function literal() {
var result = nOrMore( 1, escapedOrRegularLiteral )();
return result === null ? null : result.join( '' );
}
function escapedLiteral() {
var result = sequence( [ backslash, anyCharacter ] );
return result === null ? null : result[ 1 ];
}
choice( [ escapedLiteral, regularLiteralWithoutSpace ] );
escapedOrLiteralWithoutBar = choice( [ escapedLiteral, regularLiteralWithoutBar ] );
escapedOrRegularLiteral = choice( [ escapedLiteral, regularLiteral ] );
function replacement() {
var result = sequence( [ dollar, digits ] );
if ( result === null ) {
return null;
}
return [ 'REPLACE', parseInt( result[ 1 ], 10 ) - 1 ];
}
templateName = transform(
// see $wgLegalTitleChars
// not allowing : due to the need to catch "PLURAL:$1"
makeRegexParser( /^[ !"$&'()*,./0-9;=?@A-Z^_`a-z~\x80-\xFF+-]+/ ),
function ( result ) {
return result.toString();
}
);
function templateParam() {
var expr,
result = sequence( [ pipe, nOrMore( 0, paramExpression ) ] );
if ( result === null ) {
return null;
}
expr = result[ 1 ];
// use a "CONCAT" operator if there are multiple nodes,
// otherwise return the first node, raw.
return expr.length > 1 ? [ 'CONCAT' ].concat( expr ) : expr[ 0 ];
}
function templateWithReplacement() {
var result = sequence( [ templateName, colon, replacement ] );
return result === null ? null : [ result[ 0 ], result[ 2 ] ];
}
function templateWithOutReplacement() {
var result = sequence( [ templateName, colon, paramExpression ] );
return result === null ? null : [ result[ 0 ], result[ 2 ] ];
}
templateContents = choice( [
function () {
var res = sequence( [
// templates can have placeholders for dynamic
// replacement eg: {{PLURAL:$1|one car|$1 cars}}
// or no placeholders eg:
// {{GRAMMAR:genitive|{{SITENAME}}}
choice( [ templateWithReplacement, templateWithOutReplacement ] ),
nOrMore( 0, templateParam )
] );
return res === null ? null : res[ 0 ].concat( res[ 1 ] );
},
function () {
var res = sequence( [ templateName, nOrMore( 0, templateParam ) ] );
if ( res === null ) {
return null;
}
return [ res[ 0 ] ].concat( res[ 1 ] );
}
] );
openTemplate = makeStringParser( '{{' );
closeTemplate = makeStringParser( '}}' );
function template() {
var result = sequence( [ openTemplate, templateContents, closeTemplate ] );
return result === null ? null : result[ 1 ];
}
expression = choice( [ template, replacement, literal ] );
paramExpression = choice( [ template, replacement, literalWithoutBar ] );
function start() {
var result = nOrMore( 0, expression )();
if ( result === null ) {
return null;
}
return [ 'CONCAT' ].concat( result );
}
result = start();
/*
* For success, the pos must have gotten to the end of the input
* and returned a non-null.
* n.b. This is part of language infrastructure, so we do not throw an
* internationalizable message.
*/
if ( result === null || pos !== message.length ) {
throw new Error( 'Parse error at position ' + pos.toString() + ' in input: ' + message );
}
return result;
}
};
$.extend( $.i18n.parser, new MessageParser() );
}( jQuery ) );

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