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...
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...
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...
index.js//程序入口 引用了 ./state.js 的Parser类state.js//构造Parser类parseutil.js//向Parser类 添加有关 UtilParser 的方法statement.js//向Parser类 添加有关 StatementParser 的方法lval.js//向Parser类 添加有关 LValParser 的方法expression.js//向Parser类 添加有关 ExpressionParser 的方法location.js...
基于上一篇中介绍的JavaScript语言由词组(token)组成表达式(expression),由表达式组成语句(statement)的模式,我们将parser划分为——负责解析词法的TokenSteam模块,负责解析表达式和语句的Parser,另外,负责记录读取代码位置的InputSteam模块。 这里,有两点需要进行说明: ...
个表达式: { type: "assign", operator: "=", left: { type: "var", value: "sum" }, right: { type: "lambda", vars: [ "a", "b" ], body: { // the body should be a "prog", but because // it contains a single expression, our parser // reduces it to the expression ...
index++; return token; } } // 示例用法 const expression = "NOT (apple AND orange) OR banana"; const parser = new SearchExpressionParser(expression); const ast = parser.parse(); console.log(JSON.stringify(ast, null, 2)); 3. 解释解析器 tokenize 方法:将输入的表达式字符串分割成标记(...
简单的说,parser的工作即是将代码片段转换成计算机可读的数据结构的过程。这个“计算机可读的数据结构”更专业的说法是“抽象语法树(abstract syntax tree)”...
}//对if条件里内容的解析Parser.prototype.parseParenExpression =function(){if(this.lookahead() !=Token.tokens.LEFTPAREN_TOKEN){ Errors.push({ type: Errors.SYNTAX_ERROR, msg:"Expecting \"(\"", line:this.scanner.currLine }); }else{this.nextToken(); ...
Here are the steps you need to follow for s-expression parser −Tokenize the Input: First, divide the input string into tokens, which can be parenthesis (,) or symbols. Recursive parsing: Tokens are processed recursively to create the structure. When it finds an opening parenthesis, it ...