89 lines
2.7 KiB
JavaScript
Executable File
89 lines
2.7 KiB
JavaScript
Executable File
import {reservedWords, keywords} from "./identifier";
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import {types as tt} from "./tokentype";
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import {lineBreak} from "./whitespace";
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export function Parser(options, input, startPos) {
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this.options = options;
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this.sourceFile = this.options.sourceFile || null;
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this.isKeyword = keywords[this.options.ecmaVersion >= 6 ? 6 : 5];
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this.isReservedWord = reservedWords[this.options.ecmaVersion];
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this.input = input;
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this.loadPlugins(this.options.plugins);
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// Set up token state
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// The current position of the tokenizer in the input.
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if (startPos) {
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this.pos = startPos;
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this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos));
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this.curLine = this.input.slice(0, this.lineStart).split(lineBreak).length;
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} else {
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this.pos = this.lineStart = 0;
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this.curLine = 1;
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}
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// Properties of the current token:
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// Its type
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this.type = tt.eof;
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// For tokens that include more information than their type, the value
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this.value = null;
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// Its start and end offset
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this.start = this.end = this.pos;
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// And, if locations are used, the {line, column} object
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// corresponding to those offsets
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this.startLoc = this.endLoc = this.curPosition();
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// Position information for the previous token
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this.lastTokEndLoc = this.lastTokStartLoc = null;
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this.lastTokStart = this.lastTokEnd = this.pos;
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// The context stack is used to superficially track syntactic
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// context to predict whether a regular expression is allowed in a
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// given position.
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this.context = this.initialContext();
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this.exprAllowed = true;
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// Figure out if it's a module code.
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this.inModule = this.options.sourceType === "module";
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this.strict = this.options.strictMode === false ? false : this.inModule;
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// Used to signify the start of a potential arrow function
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this.potentialArrowAt = -1;
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// Flags to track whether we are in a function, a generator.
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this.inFunction = this.inGenerator = false;
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// Labels in scope.
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this.labels = [];
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this.decorators = [];
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// If enabled, skip leading hashbang line.
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if (this.pos === 0 && this.options.allowHashBang && this.input.slice(0, 2) === "#!") {
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this.skipLineComment(2);
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}
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}
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Parser.prototype.extend = function (name, f) {
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this[name] = f(this[name]);
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};
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// Registered plugins
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export const plugins = {};
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Parser.prototype.loadPlugins = function (plugins) {
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for (let name in plugins) {
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let plugin = exports.plugins[name];
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if (!plugin) throw new Error(`Plugin '${name}' not found`);
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plugin(this, plugins[name]);
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}
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};
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Parser.prototype.parse = function () {
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return new Promise((resolve) => {
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let node = this.options.program || this.startNode();
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this.nextToken();
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resolve(this.parseTopLevel(node));
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});
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};
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