Parser.js
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// Singleton
Parser = new(Ext.extend(Object, {
params: {},
parse: function(filename) {
var stream = new Stream(filename),
ret;
Loader.require('Parser.Statement');
ret = (new Parser.Statement()).parse(stream);
stream.close();
return ret;
},
evaluate: function(name, value) {
var modifier = null,
param = (this.params.hasOwnProperty(name)) ? this.params[name] : false,
match;
if (value === undefined) {
value = true;
}
if (Ext.isString(value)) {
match = value.match(/^(\!|<=|>=|<|>)/);
if (match) {
modifier = match[0];
value = value.slice(modifier.length);
}
// Boolean
if (value === 'true') {
value = true;
}
else if (value === 'false') {
value = false;
}
// Numeric
else if (!isNaN(value)) {
value = parseFloat(value);
}
}
switch (modifier) {
case '!':
return (param !== value);
case '>':
return (param > value);
case '<':
return (param < value);
case '<=':
return (param <= value);
case '>=':
return (param >= value);
default:
return (param === value);
}
},
setParams: function(params) {
this.params = params || {};
},
isCloseOf: function(str, statement) {
if (!statement.type) {
return false;
}
return str.trim().match(new RegExp("^\\/\\/(?:\\t|\\s)*<\\/" + ((statement.isInverted) ? "!" : "") + statement.type + ">$")) !== null;
},
isStatement: function(str) {
return this.parseStatementParts(str) !== null;
},
parseStatementParts: function(str) {
return str.trim().match(/^\/\/(?:\t|\s)*<([^\/]+)>$/);
},
parseStatementProperties: function(str) {
var properties = {},
expect = function(regexp) {
var result = str.match(regexp);
if (result !== null) {
str = str.slice(result[0].length);
return result[0];
}
return null;
},
name, equalSign, valueWrapper, valueCheck, value;
while (str.length > 0) {
expect(/^[^\w]+/i);
name = expect(/^[\w]+/i);
if (name === null) {
break;
}
equalSign = expect(/^=/);
if (equalSign === null) {
properties[name] = true;
continue;
}
valueWrapper = expect(/^('|")/i);
valueCheck = valueWrapper || "\\s";
value = expect(new RegExp('^[^' + valueCheck + ']+'));
if (valueWrapper !== null) {
expect(new RegExp(valueWrapper));
}
properties[name] = value;
}
return properties;
},
parseStatement: function(string) {
var str = string.trim(),
parts = this.parseStatementParts(str),
typeMatch, statement;
// Check if it's actually a valid statement
if (parts === null) {
return false;
}
str = parts[1];
typeMatch = str.match(/^(\!)?([\w]+)/i);
if (typeMatch === null) {
return false;
}
statement = {
properties: {}
};
statement.type = typeMatch[2];
statement.isInverted = (typeMatch[1] !== undefined);
str = str.substr(typeMatch[0].length, str.length).trim();
statement.properties = this.parseStatementProperties(str);
return statement;
}
}));