cst/lib/elements/Token.js

JavaScript CST Implementation

'use strict';

Object.defineProperty(exports, '__esModule', {
    value: true
});

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

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'); } }

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var _Element2 = require('./Element');

var _Element3 = _interopRequireDefault(_Element2);

var _utilsLines = require('../utils/lines');

var Token = (function (_Element) {
    _inherits(Token, _Element);

    _createClass(Token, null, [{
        key: 'create',

        /**
         * Generic token constructor.
         *
         * @param {String} type
         * @param {*} value
         */
        value: function create(type, value) {
            return new Token(type, value, valueToSourceCode(type, value));
        }

        /**
         * Creates new token using babel/acorn parser token.
         *
         * @param {{type: String, value: String, sourceCode: String}} token
         */
    }, {
        key: 'createFromToken',
        value: function createFromToken(token) {
            return new Token(token.type, token.value, token.sourceCode);
        }

        /**
         * @param {String} type
         * @param {String} value
         * @param {String} _sourceCode private source code argument
         */
    }]);

    function Token(type, value, _sourceCode) {
        _classCallCheck(this, Token);

        _get(Object.getPrototypeOf(Token.prototype), 'constructor', this).call(this, type, []);

        if (arguments.length === 2) {
            _sourceCode = valueToSourceCode(type, value);
        }

        var isComment = false;
        var isWhitespace = false;
        var isCode = true;
        switch (type) {
            case 'CommentLine':
                isComment = true;
                isCode = false;
                break;
            case 'CommentBlock':
                isComment = true;
                isCode = false;
                break;
            case 'Whitespace':
                isWhitespace = true;
                isCode = false;
                break;
            case 'AppleInstrumentationDirective':
            case 'GritDirective':
            case 'Hashbang':
                isCode = false;
                break;
        }
        this._value = value;
        this._sourceCode = _sourceCode;
        this._sourceCodeLength = _sourceCode.length;
        this._sourceCodeLines = (0, _utilsLines.getLines)(_sourceCode);
        this._isComment = isComment;
        this._isWhitespace = isWhitespace;
        this._isCode = isCode;
    }

    _createClass(Token, [{
        key: '_setChildren',
        value: function _setChildren(newChildren) {
            if (newChildren.length > 0) {
                throw new Error('Token nodes cannot contain child nodes');
            }

            this._childElements = newChildren;
        }

        /**
         * Clones current Element structure.
         *
         * @returns {Element}
         */
    }, {
        key: 'cloneElement',
        value: function cloneElement() {
            return new Token(this._type, this._value, this._sourceCode);
        }
    }, {
        key: 'firstToken',
        get: function get() {
            return this;
        }
    }, {
        key: 'lastToken',
        get: function get() {
            return this;
        }
    }, {
        key: 'isToken',
        get: function get() {
            return true;
        }
    }, {
        key: 'isComment',
        get: function get() {
            return this._isComment;
        }
    }, {
        key: 'isCode',
        get: function get() {
            return this._isCode;
        }
    }, {
        key: 'isWhitespace',
        get: function get() {
            return this._isWhitespace;
        }
    }, {
        key: 'value',
        get: function get() {
            return this._value;
        }
    }, {
        key: 'sourceCode',
        get: function get() {
            return this._sourceCode;
        }
    }, {
        key: 'sourceCodeLength',
        get: function get() {
            return this._sourceCodeLength;
        }
    }, {
        key: 'sourceCodeLines',
        get: function get() {
            return this._sourceCodeLines.concat();
        }
    }, {
        key: 'newlineCount',
        get: function get() {
            return this._sourceCodeLines.length - 1;
        }
    }]);

    return Token;
})(_Element3['default']);

exports['default'] = Token;

function valueToSourceCode(type, value) {
    switch (type) {
        case 'CommentLine':
            return '//' + value;

        case 'CommentBlock':
            return '/*' + value + '*/';

        case 'RegularExpression':
            return String(value);

        case 'Numeric':
        case 'Boolean':
        case 'Null':
            return String(value);

        default:
            return value;
    }
}
module.exports = exports['default'];