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extract-css-names

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extract-css-names

Extract class names and ids from css files.

  • 1.0.0
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Extract Css Names

Extract all CSS class and id names to generate (replace with) random names (a-z0-9). This module returns all matches. You can use it, to replace matches inside different files.

How it works

Read data from the provided key "data". Extract all names and generate minified class names. The result (for each file) are stored inside 2 files:

outputCss
outputJs

For each file the output are written to the provided file ouput path, in the next iteration the current files output/content readed to avoid dupplicate names.

Example how to use it with gulp

const ExtractCssNames = require('extract-css-names');
const through = require('through2');
const fs = require("fs");

gulp.task('extract:css', (done) => 
{
    /**
     * Storage
     */
    const outputCss = `${__dirname}/extracted-names-for-css`;
    const outputJs = `${__dirname}/extracted-names-for-js`;
    /**
     * Remove old matches
     */
    if (fs.existsSync(outputCss)) { fs.unlinkSync(outputCss); }
    if (fs.existsSync(outputJs)) { fs.unlinkSync(outputJs); }

    return gulp
        .src(
            [
                `public/css/packages.css`,
                `public/css/packages.less.css`,
                `public/css/app.css`,
            ]
        )
        .pipe(
            /**
            * Loop trought each file and extract names
            */
            through.obj(async (cssFileBuffer, enc, cb) => 
            {
                await new ExtractCssNames(
                    {
                        path: cssFileBuffer.path,
                        outputCss,
                        outputJs,
                        data: cssFileBuffer.contents.toString(),
                        restModulo: 10000, 
                        restTime: 200,
                        logger: {
                            logging: true,
                            prefix: 'Extract',
                            displayFilename: true,
                            displayPercentage: true,
                            type: 'bar', // spinner | bar | dots | dots2 | arc | line
                            barBg: 'bgCyan'
                        },
                        displayResult: true,
                        ignore: [
                            '.ContainerCompact',
                        ],
                    }
                );

                cb(null, cssFileBuffer);
            })
        );
});

gulp.task('obfuscate:css',
    gulp.series(
        [
            'extract:css'
        ]
    )
);

Example how to use it with node js

const ExtractCssNames = require('extract-css-names');
const fs = require("fs");

/**
* Matches storage
*/
const outputCss = `${__dirname}/extracted-names-for-css`;
const outputJs = `${__dirname}/extracted-names-for-js`;
/**
* Remove old matches
*/
if (fs.existsSync(outputCss)) { fs.unlinkSync(outputCss); }
if (fs.existsSync(outputJs)) { fs.unlinkSync(outputJs); }

const files = [
    `public/css/packages.css`,
    `public/css/packages.less.css`,
    `public/css/app.css`,
];

const extract = async (c = 0) =>
{
    const data = fs.readFileSync(files[c], 'UTF-8');

    await new ExtractCssNames(
        {
            path: files[c],
            outputCss,
            outputJs,
            data,
            restModulo: 10000,
            restTime: 200,
            logger: {
                logging: true,
                prefix: 'Extract',
                displayFilename: true,
                displayPercentage: true,
                type: 'bar', // spinner | bar | dots | dots2 | arc | line
                barBg: 'bgCyan'
            },
            displayResult: true,
            ignore: [
                '.ContainerCompact'
            ],
        }
    );

    c++;

    if(undefined !== files[c])
    {
        await extract(c);
    }
}

extract();

Example file content of outputCss

[
    {
        "find": ".rc-select-selection__choice-zoom-appear-active",
        "replace": ".a",
        "type": "class"
    },
    {
        "find": ".rc-select-selection__choice-zoom-leave-active",
        "replace": ".b",
        "type": "class"
    },
    {
        "find": ".rc-calendar-year-panel-decade-select-arrow",
        "replace": ".c",
        "type": "class"
    },
    {
        "find": ".rc-calendar-decade-panel-last-century-cell",
        "replace": ".d",
        "type": "class"
    },
    {
        "find": ".rc-calendar-decade-panel-next-century-cell",
        "replace": ".e",
        "type": "class"
    },
    {
        "find": ".rc-calendar-picker-slide-up-appear-active",
        "replace": ".f",
        "type": "class"
    }
]

Example file content of outputJs

[
    {
        "find":"rc-select-selection__choice-zoom-appear-active",
        "replace":"a",
        "type":"class"
    },
    {
        "find":"rc-select-selection__choice-zoom-leave-active",
        "replace":"b",
        "type":"class"
    },
    {
        "find":"rc-calendar-year-panel-decade-select-arrow",
        "replace":"c",
        "type":"class"
    },
    {
        "find":"rc-calendar-decade-panel-last-century-cell",
        "replace":"d",
        "type":"class"
    },
    {
        "find":"rc-calendar-decade-panel-next-century-cell",
        "replace":"e",
        "type":"class"
    },
    {
        "find":"rc-calendar-picker-slide-up-appear-active",
        "replace":"f",
        "type":"class"
    }
]

ExtractCssNames options

OptiontypeDescription
pathstringPath of the current file
outputCssstringPath to store/write current matches for replacement in CSS files
outputJsstringPath to store/write current matches for replacement in JS files
datastringPath to file or (css) data as string
restModulonumberEach number of lines should be made a break
restTimenumberDuration of the break in ms
displayResultbooleanDisplay the match result in the terminal
ignorearrayIgnore names to extract (with provided type: '.' for class and '#' for id), [ '.classNameToIgnore', '#idToIgnore' ]
loggerobjectLogger options

ExtractCssNames logger options

OptiontypeDescription
loggingbooleanDisplay current process
prefixstringPrefix on the logging line
displayFilenamebooleanDisplay current processed filename (filename extracted from path)
displayPercentagebooleanDisplay current percentage value
typestringProcess animation type. Available types: 'spinner', 'bar', 'dots', 'dots2', 'arc', 'line'
barBgstringIf the animation type is bar, then set the bar's background-color. Background colors are based on the chalk module

Maintainer

David Janitzek

Keywords

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Package last updated on 13 Oct 2021

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