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344 lines
5.2 KiB
344 lines
5.2 KiB
//.CommonJS
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var CSSOM = {
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CSSValue: require('./CSSValue').CSSValue
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};
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///CommonJS
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/**
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* @constructor
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* @see http://msdn.microsoft.com/en-us/library/ms537634(v=vs.85).aspx
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*
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*/
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CSSOM.CSSValueExpression = function CSSValueExpression(token, idx) {
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this._token = token;
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this._idx = idx;
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};
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CSSOM.CSSValueExpression.prototype = new CSSOM.CSSValue();
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CSSOM.CSSValueExpression.prototype.constructor = CSSOM.CSSValueExpression;
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/**
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* parse css expression() value
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*
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* @return {Object}
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* - error:
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* or
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* - idx:
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* - expression:
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*
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* Example:
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*
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* .selector {
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* zoom: expression(documentElement.clientWidth > 1000 ? '1000px' : 'auto');
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* }
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*/
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CSSOM.CSSValueExpression.prototype.parse = function() {
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var token = this._token,
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idx = this._idx;
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var character = '',
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expression = '',
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error = '',
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info,
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paren = [];
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for (; ; ++idx) {
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character = token.charAt(idx);
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// end of token
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if (character === '') {
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error = 'css expression error: unfinished expression!';
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break;
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}
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switch(character) {
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case '(':
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paren.push(character);
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expression += character;
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break;
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case ')':
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paren.pop(character);
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expression += character;
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break;
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case '/':
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if ((info = this._parseJSComment(token, idx))) { // comment?
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if (info.error) {
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error = 'css expression error: unfinished comment in expression!';
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} else {
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idx = info.idx;
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// ignore the comment
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}
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} else if ((info = this._parseJSRexExp(token, idx))) { // regexp
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idx = info.idx;
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expression += info.text;
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} else { // other
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expression += character;
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}
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break;
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case "'":
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case '"':
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info = this._parseJSString(token, idx, character);
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if (info) { // string
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idx = info.idx;
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expression += info.text;
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} else {
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expression += character;
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}
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break;
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default:
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expression += character;
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break;
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}
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if (error) {
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break;
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}
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// end of expression
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if (paren.length === 0) {
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break;
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}
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}
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var ret;
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if (error) {
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ret = {
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error: error
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};
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} else {
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ret = {
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idx: idx,
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expression: expression
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};
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}
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return ret;
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};
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/**
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*
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* @return {Object|false}
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* - idx:
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* - text:
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* or
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* - error:
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* or
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* false
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*
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*/
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CSSOM.CSSValueExpression.prototype._parseJSComment = function(token, idx) {
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var nextChar = token.charAt(idx + 1),
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text;
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if (nextChar === '/' || nextChar === '*') {
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var startIdx = idx,
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endIdx,
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commentEndChar;
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if (nextChar === '/') { // line comment
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commentEndChar = '\n';
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} else if (nextChar === '*') { // block comment
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commentEndChar = '*/';
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}
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endIdx = token.indexOf(commentEndChar, startIdx + 1 + 1);
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if (endIdx !== -1) {
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endIdx = endIdx + commentEndChar.length - 1;
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text = token.substring(idx, endIdx + 1);
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return {
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idx: endIdx,
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text: text
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};
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} else {
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var error = 'css expression error: unfinished comment in expression!';
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return {
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error: error
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};
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}
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} else {
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return false;
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}
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};
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/**
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*
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* @return {Object|false}
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* - idx:
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* - text:
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* or
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* false
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*
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*/
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CSSOM.CSSValueExpression.prototype._parseJSString = function(token, idx, sep) {
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var endIdx = this._findMatchedIdx(token, idx, sep),
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text;
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if (endIdx === -1) {
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return false;
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} else {
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text = token.substring(idx, endIdx + sep.length);
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return {
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idx: endIdx,
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text: text
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};
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}
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};
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/**
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* parse regexp in css expression
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*
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* @return {Object|false}
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* - idx:
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* - regExp:
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* or
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* false
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*/
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/*
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all legal RegExp
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/a/
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(/a/)
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[/a/]
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[12, /a/]
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!/a/
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+/a/
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-/a/
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* /a/
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/ /a/
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%/a/
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===/a/
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!==/a/
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==/a/
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!=/a/
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>/a/
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>=/a/
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</a/
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<=/a/
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&/a/
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|/a/
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^/a/
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~/a/
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<</a/
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>>/a/
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>>>/a/
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&&/a/
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||/a/
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?/a/
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=/a/
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,/a/
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delete /a/
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in /a/
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instanceof /a/
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new /a/
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typeof /a/
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void /a/
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*/
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CSSOM.CSSValueExpression.prototype._parseJSRexExp = function(token, idx) {
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var before = token.substring(0, idx).replace(/\s+$/, ""),
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legalRegx = [
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/^$/,
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/\($/,
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/\[$/,
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/\!$/,
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/\+$/,
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/\-$/,
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/\*$/,
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/\/\s+/,
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/\%$/,
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/\=$/,
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/\>$/,
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/<$/,
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/\&$/,
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/\|$/,
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/\^$/,
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/\~$/,
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/\?$/,
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/\,$/,
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/delete$/,
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/in$/,
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/instanceof$/,
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/new$/,
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/typeof$/,
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/void$/
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];
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var isLegal = legalRegx.some(function(reg) {
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return reg.test(before);
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});
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if (!isLegal) {
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return false;
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} else {
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var sep = '/';
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// same logic as string
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return this._parseJSString(token, idx, sep);
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}
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};
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/**
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*
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* find next sep(same line) index in `token`
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*
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* @return {Number}
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*
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*/
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CSSOM.CSSValueExpression.prototype._findMatchedIdx = function(token, idx, sep) {
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var startIdx = idx,
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endIdx;
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var NOT_FOUND = -1;
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while(true) {
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endIdx = token.indexOf(sep, startIdx + 1);
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if (endIdx === -1) { // not found
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endIdx = NOT_FOUND;
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break;
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} else {
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var text = token.substring(idx + 1, endIdx),
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matched = text.match(/\\+$/);
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if (!matched || matched[0] % 2 === 0) { // not escaped
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break;
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} else {
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startIdx = endIdx;
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}
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}
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}
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// boundary must be in the same line(js sting or regexp)
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var nextNewLineIdx = token.indexOf('\n', idx + 1);
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if (nextNewLineIdx < endIdx) {
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endIdx = NOT_FOUND;
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}
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return endIdx;
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};
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//.CommonJS
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exports.CSSValueExpression = CSSOM.CSSValueExpression;
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///CommonJS
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