3) statement.js 调用 parseBlockBody,开始解析。这个阶段会构造File根节点和program节点,并在parse完成之后闭合 4) 执行parseStatement, 将已经合法的节点插入到body中。这个阶段会产生各种*Statement type的节点 5)分解statement, parseExpression。这个阶段除了产生各种expression的节点以外,还将将产生type为Identifier的节...
a tiny JavaScript expression parser Downloadv1.4.01kb minified & gzipped Source on GitHubAnnotated Source About jsepis a JavaScript parser for JavaScript expressions. jsep is able to parse expressions likex * (1 + 2)orfoo(bar.baz[0])and convert them into an AST. jsep works in both server...
jsep: A Tiny JavaScript Expression Parser jsepis a simple expression parser written in JavaScript. It can parse JavaScript expressions but not operations. The difference between expressions and operations is akin to the difference between a cell in an Excel spreadsheet vs. a proper JavaScript program...
split(/\s+/); } // Recursive function to parse tokens into an S-expression function parse(tokens) { if (tokens.length === 0) { throw new Error("Unexpected end of input"); } // Get the next token let token = tokens.shift(); // Start a new list if (token === '(') { ...
function parseExpression(expression) { var operators = expression.match(/[+\-*/]/g); var operands = expression.split(/[+\-*/]/); for (var i = 0; i < operands.length; i++) { if (operands[i].includes("[")) { operands[i] = operands[i].replace("[", "").replace(...
else return parse_expression(); } 当然,这样的分发模式,也是只限定于我们在最开始划定的规则范围,得益于规则范围小的优势,parse_statement函数的逻辑得以简化,另外,虽然语句(statements)是由表达式(expressions)组成的,但是,表达式(expression)依然能单独存在于代码块中,所以,在parse_statement的最后,不符合所有语句条件...
parseExpression(); } tokenize(expression) { const regex = /\s*(=>|&&|\|\||!|\(|\)|\w+)\s*/g; return expression.match(regex).map(token => token.trim()); } parseExpression() { let left = this.parseTerm(); while (this.peek() === 'OR') { this.consume('OR'); const ...
functionparse_toplevel(){varprog=[];while(!input.eof()){prog.push(parse_expression());if(!input.eof())skip_punc(";");}return{type:"prog",prog:prog};} 由于不支持语句,所以我们就简单通过不停地调用parse_expression()函数来读取输入流中的表达式。使用skip_punc(";")因为表达式要求由分号分隔。
expression [expression] 第一种写法是一个表达式后跟随一个句点和标识符。表达式指定对象,标识符则指定要访问的属性明川。 第二章写法是使用方括号,方括号内是一个表达式(这种方法适用于对象和数组)。第二个表达式指定要访问的属性的明川或者代表要访问数组元素的索引。这里有一些具体的例子 ...
parse({expression: string}) Convert a mathematical expression into an Expression object. evaluate({expression: string} [, {variables: object}]) Parse and immediately evaluate an expression using the values/functions from the {variables} object. ...