79 lines
2.7 KiB
JavaScript
79 lines
2.7 KiB
JavaScript
'use strict';
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var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();
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var _require = require('./utils'),
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evaluate = _require.evaluate,
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splitlines = _require.splitlines;
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var PATTERN = /^\s*\/\/\s*#(if(?:def|ndef)?|elif|else|endif)\s*(.*)$/;
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var COMMENT = '// # ';
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var COMMENT_RE = /\/\/\s?#\s/;
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var STATES = {
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if: { elif: 1, else: 1, endif: 1 },
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elif: { elif: 1, else: 1, endif: 1 },
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else: { endif: 1 },
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endif: { if: 1, ifdef: 1, ifndef: 1 }
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};
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STATES.ifdef = STATES.ifndef = STATES.if;
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module.exports = Parser;
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function Parser(macros) {
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this._eval = evaluate(macros);
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this._state = 'endif';
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this._comment = this._if = false;
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}
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Parser.prototype = {
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parse: function parse() {
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var _this = this;
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var data = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';
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return splitlines(data).map(function (line) {
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var _ref = PATTERN.exec(line) || [],
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_ref2 = _slicedToArray(_ref, 3),
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l = _ref2[0],
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cmd = _ref2[1],
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expr = _ref2[2]; // eslint-disable-line no-unused-vars
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line = line.replace(COMMENT_RE, '');
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if (_this._isCmd(cmd)) {
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_this._expr(cmd, expr);
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} else if (_this._comment) {
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line = COMMENT + line;
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}
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return line;
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});
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},
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_isCmd: function _isCmd(cmd) {
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if (!cmd) return;
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if (!STATES[this._state][cmd]) {
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var exp = '#' + Object.keys(STATES[this._state]).join(', #');
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throw new Error('got #' + cmd + ' expected ' + exp);
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}
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this._state = cmd;
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return true;
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},
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_expr: function _expr(cmd, expr) {
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if (/^(?:el)?if/.test(cmd)) {
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if (!expr) {
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throw new Error('macro is missing');
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}
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if (cmd === 'ifdef') {
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expr = 'typeof ' + expr + ' !== \'undefined\'';
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} else if (cmd === 'ifndef') {
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expr = 'typeof ' + expr + ' === \'undefined\'';
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}
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var res = this._eval(expr);
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this._if = this._if || res;
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this._comment = !res;
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} else if (cmd === 'else') {
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this._comment = this._if;
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} else if (cmd === 'endif') {
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this._comment = this._if = false;
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}
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}
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}; |