strip-comments-strings

Description

Strip or extract comments, strings or both from source code.

Install

npm install strip-comments-strings

Usage

const {parseString, stripStrings, stripComments} = require("strip-comments-strings");

or

import {parseString, stripStrings, stripComments} from "strip-comments-strings"

Examples

Example file

📝 example.js ↴

/** // **/
/** 1 **/
//aaaa
/** 2 **/
//bbbbb
//ccccc
///////////
/** 3 **/
/** 4 **/
/** 5 **/
""
aa
"attenti\"on"
bb
ccc
'warni\\'
'ng\''
ddd
eeee`info`
eeee
fffff
"silence"
fffff
gggggg
'noise'
gggggg
hhhhhhh`visibility`
hhhhhhh
"aaa"
"aaa"
"aaa"

Strip comments from source

let str = fs.readFileSync(path.join(__dirname, "./example.js"), "utf-8");

const stripMyComments = (str) =>
{
    let counter = 0
    str = stripComments(str, function (info)
    {
        return `(${counter++})`
    }, {includeDelimiter: false});

    return str
}

console.log(str)

The code above replaces all comments with ({index})

(9)
(8)
(7)(6)
(5)(4)(3)(2)
(1)
(0)
""
aa
"attenti\"on"
bb
ccc
'warni\\'
'ng\''
ddd
eeee`info`
eeee
fffff
"silence"
fffff
gggggg
'noise'
gggggg
hhhhhhh`visibility`
hhhhhhh
"aaa"
"aaa"
"aaa"

Strip strings from source

    let str = fs.readFileSync(path.join(__dirname, "./example-6.js"), "utf-8");

str = stripStrings(str, function (info)
{
    return "**"
}, {includeDelimiter: true});

The code above replaces all strings with two "!!"

/** // **/
/** 1 **/
//aaaa
/** 2 **/
//bbbbb
//ccccc
///////////
/** 3 **/
/** 4 **/
/** 5 **/
!!
aa
!!
bb
ccc
!!
!!
ddd
eeee!!
eeee
fffff
!!
fffff
gggggg
!!
gggggg
hhhhhhh!!
hhhhhhh
!!
!!
!!

Strip comments and strings

// ...
str = stripMyComments(str)
str = stripMyStrings(str)
// ...

It is best to always start by removing comments then strings.

Parse source

const found = parseString(str);
console.log( found );

{
  text: '',
  strings: [
    { content: '', index: 107, indexEnd: 107, item: [Object] },
    {
      content: 'attenti\\"on',
      index: 115,
      indexEnd: 126,
      item: [Object]
    },
    { content: 'warni\\\\', index: 139, indexEnd: 146, item: [Object] },
    { content: "ng\\'", index: 150, indexEnd: 154, item: [Object] },
    { content: 'info', index: 167, indexEnd: 171, item: [Object] },
    { content: 'silence', index: 188, indexEnd: 195, item: [Object] },
    { content: 'noise', index: 214, indexEnd: 219, item: [Object] },
    {
      content: 'visibility',
      index: 238,
      indexEnd: 248,
      item: [Object]
    },
    { content: 'aaa', index: 261, indexEnd: 264, item: [Object] },
    { content: 'aaa', index: 268, indexEnd: 271, item: [Object] },
    { content: 'aaa', index: 275, indexEnd: 278, item: [Object] }
  ],
  comments: [
    {
      type: 'commentBlock',
      content: '/** // **/',
      index: 0,
      indexEnd: 10
    },
    {
      type: 'commentBlock',
      content: '/** 1 **/',
      index: 12,
      indexEnd: 21
    },
    {
      type: 'commentLine',
      content: '//aaaa\r\n',
      index: 23,
      indexEnd: 31
    },
    {
      type: 'commentBlock',
      content: '/** 2 **/',
      index: 31,
      indexEnd: 40
    },
    {
      type: 'commentLine',
      content: '//bbbbb\r\n',
      index: 42,
      indexEnd: 51
    },
    {
      type: 'commentLine',
      content: '//ccccc\r\n',
      index: 51,
      indexEnd: 60
    },
    {
      type: 'commentLine',
      content: '///////////\r\n',
      index: 60,
      indexEnd: 73
    },
    {
      type: 'commentBlock',
      content: '/** 3 **/',
      index: 73,
      indexEnd: 82
    },
    {
      type: 'commentBlock',
      content: '/** 4 **/',
      index: 84,
      indexEnd: 93
    },
    {
      type: 'commentBlock',
      content: '/** 5 **/',
      index: 95,
      indexEnd: 104
    }
  ]
}