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何かJavaScriptのソースコードを機械的にチェックするためのツールを作りたいという場合に、JavaScriptのASTというものを触る必要が出てくると思います。 この記事では、その取っ掛かりとなる案内を簡単にまとめたものです。 ASTとは AST(Abstract Syntax Tree)はコードをパースした抽象構文木のこと。 JavaScriptの場合はJavaScriptオブジェクト(JSON)として表現されます。 コード: { "range": [ 0, 10 ], "type": "Program", "body": [ { "range": [ 0, 10 ], "type": "VariableDeclaration", "declarations": [ { "range": [ 4, 9 ], "type": "VariableDeclarator", "id": {
Thanks to two awesome people (Nick and Andy), for introducing me to Esprima. If you have never heard about Esprima, here is a quick intro. Esprima is a high performance, standard-compliant ECMAScript parser written in ECMAScript In simple words, Esprima is a Javascript parser. It reads a string that consists of Javascript code and makes sense of it. So where and why exactly you need a Javascript p
A couple of weeks ago, I wrote about how to do some basic static analysis of Javascript source code using Esprima. This post is a follow up where I demonstrate how to write a program to transforms Javascript source code using an Esprima-based library - falafel. Hello, Falafel Falafel is an AST traversal library like estraverse. If you've read my previous article, this is familiar territory. Instea
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