notes/node_modules/postcss/lib/previous-map.js

'use strict';

exports.__esModule = true;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _jsBase = require('js-base64');

var _sourceMap = require('source-map');

var _sourceMap2 = _interopRequireDefault(_sourceMap);

var _path = require('path');

var _path2 = _interopRequireDefault(_path);

var _fs = require('fs');

var _fs2 = _interopRequireDefault(_fs);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * Source map information from input CSS.
 * For example, source map after Sass compiler.
 *
 * This class will automatically find source map in input CSS or in file system
 * near input file (according `from` option).
 *
 * @example
 * const root = postcss.parse(css, { from: 'a.sass.css' });
 * root.input.map //=> PreviousMap
 */
var PreviousMap = function () {

    /**
     * @param {string}         css    - input CSS source
     * @param {processOptions} [opts] - {@link Processor#process} options
     */
    function PreviousMap(css, opts) {
        _classCallCheck(this, PreviousMap);

        this.loadAnnotation(css);
        /**
         * @member {boolean} - Was source map inlined by data-uri to input CSS.
         */
        this.inline = this.startWith(this.annotation, 'data:');

        var prev = opts.map ? opts.map.prev : undefined;
        var text = this.loadMap(opts.from, prev);
        if (text) this.text = text;
    }

    /**
     * Create a instance of `SourceMapGenerator` class
     * from the `source-map` library to work with source map information.
     *
     * It is lazy method, so it will create object only on first call
     * and then it will use cache.
     *
     * @return {SourceMapGenerator} object with source map information
     */


    PreviousMap.prototype.consumer = function consumer() {
        if (!this.consumerCache) {
            this.consumerCache = new _sourceMap2.default.SourceMapConsumer(this.text);
        }
        return this.consumerCache;
    };

    /**
     * Does source map contains `sourcesContent` with input source text.
     *
     * @return {boolean} Is `sourcesContent` present
     */


    PreviousMap.prototype.withContent = function withContent() {
        return !!(this.consumer().sourcesContent && this.consumer().sourcesContent.length > 0);
    };

    PreviousMap.prototype.startWith = function startWith(string, start) {
        if (!string) return false;
        return string.substr(0, start.length) === start;
    };

    PreviousMap.prototype.loadAnnotation = function loadAnnotation(css) {
        var match = css.match(/\/\*\s*# sourceMappingURL=(.*)\s*\*\//);
        if (match) this.annotation = match[1].trim();
    };

    PreviousMap.prototype.decodeInline = function decodeInline(text) {
        var utfd64 = 'data:application/json;charset=utf-8;base64,';
        var utf64 = 'data:application/json;charset=utf8;base64,';
        var b64 = 'data:application/json;base64,';
        var uri = 'data:application/json,';

        if (this.startWith(text, uri)) {
            return decodeURIComponent(text.substr(uri.length));
        } else if (this.startWith(text, b64)) {
            return _jsBase.Base64.decode(text.substr(b64.length));
        } else if (this.startWith(text, utf64)) {
            return _jsBase.Base64.decode(text.substr(utf64.length));
        } else if (this.startWith(text, utfd64)) {
            return _jsBase.Base64.decode(text.substr(utfd64.length));
        } else {
            var encoding = text.match(/data:application\/json;([^,]+),/)[1];
            throw new Error('Unsupported source map encoding ' + encoding);
        }
    };

    PreviousMap.prototype.loadMap = function loadMap(file, prev) {
        if (prev === false) return false;

        if (prev) {
            if (typeof prev === 'string') {
                return prev;
            } else if (typeof prev === 'function') {
                var prevPath = prev(file);
                if (prevPath && _fs2.default.existsSync && _fs2.default.existsSync(prevPath)) {
                    return _fs2.default.readFileSync(prevPath, 'utf-8').toString().trim();
                } else {
                    throw new Error('Unable to load previous source map: ' + prevPath.toString());
                }
            } else if (prev instanceof _sourceMap2.default.SourceMapConsumer) {
                return _sourceMap2.default.SourceMapGenerator.fromSourceMap(prev).toString();
            } else if (prev instanceof _sourceMap2.default.SourceMapGenerator) {
                return prev.toString();
            } else if (this.isMap(prev)) {
                return JSON.stringify(prev);
            } else {
                throw new Error('Unsupported previous source map format: ' + prev.toString());
            }
        } else if (this.inline) {
            return this.decodeInline(this.annotation);
        } else if (this.annotation) {
            var map = this.annotation;
            if (file) map = _path2.default.join(_path2.default.dirname(file), map);

            this.root = _path2.default.dirname(map);
            if (_fs2.default.existsSync && _fs2.default.existsSync(map)) {
                return _fs2.default.readFileSync(map, 'utf-8').toString().trim();
            } else {
                return false;
            }
        }
    };

    PreviousMap.prototype.isMap = function isMap(map) {
        if ((typeof map === 'undefined' ? 'undefined' : _typeof(map)) !== 'object') return false;
        return typeof map.mappings === 'string' || typeof map._mappings === 'string';
    };

    return PreviousMap;
}();

exports.default = PreviousMap;
module.exports = exports['default'];
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opts.map.prev : undefined;\n        let text = this.loadMap(opts.from, prev);\n        if ( text ) this.text = text;\n    }\n\n    /**\n     * Create a instance of `SourceMapGenerator` class\n     * from the `source-map` library to work with source map information.\n     *\n     * It is lazy method, so it will create object only on first call\n     * and then it will use cache.\n     *\n     * @return {SourceMapGenerator} object with source map information\n     */\n    consumer() {\n        if ( !this.consumerCache ) {\n            this.consumerCache = new mozilla.SourceMapConsumer(this.text);\n        }\n        return this.consumerCache;\n    }\n\n    /**\n     * Does source map contains `sourcesContent` with input source text.\n     *\n     * @return {boolean} Is `sourcesContent` present\n     */\n    withContent() {\n        return !!(this.consumer().sourcesContent &&\n                  this.consumer().sourcesContent.length > 0);\n    }\n\n    startWith(string, start) {\n        if ( !string ) return false;\n        return string.substr(0, start.length) === start;\n    }\n\n    loadAnnotation(css) {\n        let match = css.match(/\\/\\*\\s*# sourceMappingURL=(.*)\\s*\\*\\//);\n        if ( match ) this.annotation = match[1].trim();\n    }\n\n    decodeInline(text) {\n        let utfd64 = 'data:application/json;charset=utf-8;base64,';\n        let utf64  = 'data:application/json;charset=utf8;base64,';\n        let b64    = 'data:application/json;base64,';\n        let uri    = 'data:application/json,';\n\n        if ( this.startWith(text, uri) ) {\n            return decodeURIComponent( text.substr(uri.length) );\n\n        } else if ( this.startWith(text, b64) ) {\n            return Base64.decode( text.substr(b64.length) );\n\n        } else if ( this.startWith(text, utf64) ) {\n            return Base64.decode( text.substr(utf64.length) );\n\n        } else if ( this.startWith(text, utfd64) ) {\n            return Base64.decode( text.substr(utfd64.length) );\n\n        } else {\n            let encoding = text.match(/data:application\\/json;([^,]+),/)[1];\n            throw new Error('Unsupported source map encoding ' + encoding);\n        }\n    }\n\n    loadMap(file, prev) {\n        if ( prev === false ) return false;\n\n        if ( prev ) {\n            if ( typeof prev === 'string' ) {\n                return prev;\n            } else if ( typeof prev === 'function' ) {\n                let prevPath = prev(file);\n                if ( prevPath && fs.existsSync && fs.existsSync(prevPath) ) {\n                    return fs.readFileSync(prevPath, 'utf-8').toString().trim();\n                } else {\n                    throw new Error('Unable to load previous source map: ' +\n                    prevPath.toString());\n                }\n            } else if ( prev instanceof mozilla.SourceMapConsumer ) {\n                return mozilla.SourceMapGenerator\n                    .fromSourceMap(prev).toString();\n            } else if ( prev instanceof mozilla.SourceMapGenerator ) {\n                return prev.toString();\n            } else if ( this.isMap(prev) ) {\n                return JSON.stringify(prev);\n            } else {\n                throw new Error('Unsupported previous source map format: ' +\n                    prev.toString());\n            }\n\n        } else if ( this.inline ) {\n            return this.decodeInline(this.annotation);\n\n        } else if ( this.annotation ) {\n            let map = this.annotation;\n            if ( file ) map = path.join(path.dirname(file), map);\n\n            this.root = path.dirname(map);\n            if ( fs.existsSync && fs.existsSync(map) ) {\n                return fs.readFileSync(map, 'utf-8').toString().trim();\n            } else {\n                return false;\n            }\n        }\n    }\n\n    isMap(map) {\n        if ( typeof map !== 'object' ) return false;\n        return typeof map.mappings === 'string' ||\n               typeof map._mappings === 'string';\n    }\n}\n\nexport default PreviousMap;\n"]}