/esprima-pegjs-jsconfeu-talk

Source code from talks by Patrick Dubois, Yonatan Mevorach and others about Compilers

Primary LanguageCoffeeScript

About

This repository contains code samples from the talks:

  1. Parsing, Compiling, and Static Metaprogramming at JSConfEU 2013 by Patrick Dubroy.
  2. Master the Art of the AST and Take Control of Your JS by Yonatan Mevorach.
  3. Talk on the same topic at Javascript Israel by Yonatan Mevorach

Talk Master the Art of the AST and Take Control of Your JS by Yonatan Mevorach

ASTExplorer

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jscodeshift example

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Talk Parsing, Compiling, and Static Metaprogramming at JSConfEU 2013 by Patrick Dubroy.

Esprima Examples

  • checkstyle.coffee and logging.coffee contain the original source code for the style checker and logging examples presented in the talk.
  • checkstyle.js and logging.js are the slightly simplified JS versions that were shown in the talk.
  • syntax-highlight.js is taken from the Esprima tutorial Chapter 3. Lexical Analysis (Tokenization)¶

PEG.js Example

altjs.coffee is the code for the "AltJS language in 5 minutes" section presented in the second half of the talk.

Extra Special Bonus!

idgrep.coffee (and idgrep.js) is another example of using Esprima to do static analysis on JavaScript code.

REPL example

> esprima = require('esprima')
{ parse: [Function: parse],
  parseModule: [Function: parseModule],
  parseScript: [Function: parseScript],
  tokenize: [Function: tokenize],
  Syntax: 
   { ... },
  version: '4.0.1' }

> esprima.tokenize('answer = 42', { range: true })
[ { type: 'Identifier', value: 'answer', range: [ 0, 6 ] },
  { type: 'Punctuator', value: '=', range: [ 7, 8 ] },
  { type: 'Numeric', value: '42', range: [ 9, 11 ] } ]

> esprima.parseScript('const answer = 42', { tokens: true })
Script {
  type: 'Program',
  body: 
   [ VariableDeclaration {
       type: 'VariableDeclaration',
       declarations: [Array],
       kind: 'const' } ],
  sourceType: 'script',
  tokens: 
   [ { type: 'Keyword', value: 'const' },
     { type: 'Identifier', value: 'answer' },
     { type: 'Punctuator', value: '=' },
     { type: 'Numeric', value: '42' } ] }

> inspect = require('util')
{ ... }

> console.log(util.inspect(esprima.parseScript('answer = 42'), {depth: null}))
Script {
  type: 'Program',
  body: 
   [ ExpressionStatement {
       type: 'ExpressionStatement',
       expression: 
        AssignmentExpression {
          type: 'AssignmentExpression',
          operator: '=',
          left: Identifier { type: 'Identifier', name: 'answer' },
          right: Literal { type: 'Literal', value: 42, raw: '42' } } } ],
  sourceType: 'script' }
undefined
>