PEG.js Require Extension

A simple require extension for PEG.js that supports importing syntax

If you're using webpack, it's recommended to use pegjs-import-loader

Install

npm install --save-dev pegjs-require-import

Usage

Importing Syntax

parser.pegjs:

{
    const str = 'This is just an example string';
    function concat(a, b) {
        return a.concat(b);
    }
}
Expression
  = head:Term tail:(_ ("+" / "-") _ Term)* {
      return tail.reduce(function(result, element) {
        if (element[1] === "+") { return result + element[3]; }
        if (element[1] === "-") { return result - element[3]; }
      }, head);
    }
    
Factor
  = "(" _ expr:Expression _ ")" { return expr; }
  / Integer
 
@import './base-rules.pegjs'
@import './keywords.pegjs'

Import syntax is the same as in pegjs-import-loader

Generate a parser in JS code using require

const pegjs_require = require('pegjs-require-import');
const parser = pegjs_require('./parser.pegjs', {
  format: 'commonjs',
  dependencies: {
    _: 'lodash'
  }
});
const result = parser.parse(content);

API

pegjs_require(file_path, options)

options

Type: object
See more about PEG.js options