... return function $parse(exp, interceptorFn, expensiveChecks) { var parsedExpression, oneTime, cacheKey; switch (typeof exp) { case 'string': cacheKey = exp = exp.trim(); var cache = (expensiveChecks ? cacheExpensive : cacheDefault); parsedExpression = cache[cacheKey]; if (!parsedExpression) { if (exp.charAt(0) === ':' && exp.charAt(1) === ':') { oneTime = true; exp = exp.substring(2); } var parseOptions = expensiveChecks ? $parseOptionsExpensive : $parseOptions; //调用lexer和parser var lexer = new Lexer(parseOptions); var parser = new Parser(lexer, $filter, parseOptions); parsedExpression = parser.parse(exp); //添加$$watchDelegate,为scope部分提供支持 if (parsedExpression.constant) { parsedExpression.$$watchDelegate = constantWatchDelegate; } else if (oneTime) { //oneTime is not part of the exp passed to the Parser so we may have to //wrap the parsedExpression before adding a $$watchDelegate parsedExpression = wrapSharedExpression(parsedExpression); parsedExpression.$$watchDelegate = parsedExpression.literal ? oneTimeLiteralWatchDelegate : oneTimeWatchDelegate; } else if (parsedExpression.inputs) { parsedExpression.$$watchDelegate = inputsWatchDelegate; } //做相关缓存 cache[cacheKey] = parsedExpression; } return addInterceptor(parsedExpression, interceptorFn); case 'function': return addInterceptor(exp, interceptorFn); default: return addInterceptor(noop, interceptorFn); } };
总结：Lexer和Parser的实现确实让我大开眼界。通过这两个函数，实现了angular自己的语法解析器。逻辑部分还是相对复杂
以上所述是小编给大家介绍的Angularjs 1.3 中的$parse实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！
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