source: imaps-frontend/node_modules/espree/lib/espree.js@ d565449

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Last change on this file since d565449 was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago

Update repo after prototype presentation
  • Property mode set to 100644
File size: 11.9 KB
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1/* eslint no-param-reassign: 0 -- stylistic choice */
2
3import TokenTranslator from "./token-translator.js";
4import { normalizeOptions } from "./options.js";
5
6
7const STATE = Symbol("espree's internal state");
8const ESPRIMA_FINISH_NODE = Symbol("espree's esprimaFinishNode");
9
10
11/**
12 * Converts an Acorn comment to a Esprima comment.
13 * @param {boolean} block True if it's a block comment, false if not.
14 * @param {string} text The text of the comment.
15 * @param {int} start The index at which the comment starts.
16 * @param {int} end The index at which the comment ends.
17 * @param {Location} startLoc The location at which the comment starts.
18 * @param {Location} endLoc The location at which the comment ends.
19 * @param {string} code The source code being parsed.
20 * @returns {Object} The comment object.
21 * @private
22 */
23function convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code) {
24 let type;
25
26 if (block) {
27 type = "Block";
28 } else if (code.slice(start, start + 2) === "#!") {
29 type = "Hashbang";
30 } else {
31 type = "Line";
32 }
33
34 const comment = {
35 type,
36 value: text
37 };
38
39 if (typeof start === "number") {
40 comment.start = start;
41 comment.end = end;
42 comment.range = [start, end];
43 }
44
45 if (typeof startLoc === "object") {
46 comment.loc = {
47 start: startLoc,
48 end: endLoc
49 };
50 }
51
52 return comment;
53}
54
55export default () => Parser => {
56 const tokTypes = Object.assign({}, Parser.acorn.tokTypes);
57
58 if (Parser.acornJsx) {
59 Object.assign(tokTypes, Parser.acornJsx.tokTypes);
60 }
61
62 return class Espree extends Parser {
63 constructor(opts, code) {
64 if (typeof opts !== "object" || opts === null) {
65 opts = {};
66 }
67 if (typeof code !== "string" && !(code instanceof String)) {
68 code = String(code);
69 }
70
71 // save original source type in case of commonjs
72 const originalSourceType = opts.sourceType;
73 const options = normalizeOptions(opts);
74 const ecmaFeatures = options.ecmaFeatures || {};
75 const tokenTranslator =
76 options.tokens === true
77 ? new TokenTranslator(tokTypes, code)
78 : null;
79
80 /*
81 * Data that is unique to Espree and is not represented internally
82 * in Acorn.
83 *
84 * For ES2023 hashbangs, Espree will call `onComment()` during the
85 * constructor, so we must define state before having access to
86 * `this`.
87 */
88 const state = {
89 originalSourceType: originalSourceType || options.sourceType,
90 tokens: tokenTranslator ? [] : null,
91 comments: options.comment === true ? [] : null,
92 impliedStrict: ecmaFeatures.impliedStrict === true && options.ecmaVersion >= 5,
93 ecmaVersion: options.ecmaVersion,
94 jsxAttrValueToken: false,
95 lastToken: null,
96 templateElements: []
97 };
98
99 // Initialize acorn parser.
100 super({
101
102 // do not use spread, because we don't want to pass any unknown options to acorn
103 ecmaVersion: options.ecmaVersion,
104 sourceType: options.sourceType,
105 ranges: options.ranges,
106 locations: options.locations,
107 allowReserved: options.allowReserved,
108
109 // Truthy value is true for backward compatibility.
110 allowReturnOutsideFunction: options.allowReturnOutsideFunction,
111
112 // Collect tokens
113 onToken(token) {
114 if (tokenTranslator) {
115
116 // Use `tokens`, `ecmaVersion`, and `jsxAttrValueToken` in the state.
117 tokenTranslator.onToken(token, state);
118 }
119 if (token.type !== tokTypes.eof) {
120 state.lastToken = token;
121 }
122 },
123
124 // Collect comments
125 onComment(block, text, start, end, startLoc, endLoc) {
126 if (state.comments) {
127 const comment = convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code);
128
129 state.comments.push(comment);
130 }
131 }
132 }, code);
133
134 /*
135 * We put all of this data into a symbol property as a way to avoid
136 * potential naming conflicts with future versions of Acorn.
137 */
138 this[STATE] = state;
139 }
140
141 tokenize() {
142 do {
143 this.next();
144 } while (this.type !== tokTypes.eof);
145
146 // Consume the final eof token
147 this.next();
148
149 const extra = this[STATE];
150 const tokens = extra.tokens;
151
152 if (extra.comments) {
153 tokens.comments = extra.comments;
154 }
155
156 return tokens;
157 }
158
159 finishNode(...args) {
160 const result = super.finishNode(...args);
161
162 return this[ESPRIMA_FINISH_NODE](result);
163 }
164
165 finishNodeAt(...args) {
166 const result = super.finishNodeAt(...args);
167
168 return this[ESPRIMA_FINISH_NODE](result);
169 }
170
171 parse() {
172 const extra = this[STATE];
173 const program = super.parse();
174
175 program.sourceType = extra.originalSourceType;
176
177 if (extra.comments) {
178 program.comments = extra.comments;
179 }
180 if (extra.tokens) {
181 program.tokens = extra.tokens;
182 }
183
184 /*
185 * Adjust opening and closing position of program to match Esprima.
186 * Acorn always starts programs at range 0 whereas Esprima starts at the
187 * first AST node's start (the only real difference is when there's leading
188 * whitespace or leading comments). Acorn also counts trailing whitespace
189 * as part of the program whereas Esprima only counts up to the last token.
190 */
191 if (program.body.length) {
192 const [firstNode] = program.body;
193
194 if (program.range) {
195 program.range[0] = firstNode.range[0];
196 }
197 if (program.loc) {
198 program.loc.start = firstNode.loc.start;
199 }
200 program.start = firstNode.start;
201 }
202 if (extra.lastToken) {
203 if (program.range) {
204 program.range[1] = extra.lastToken.range[1];
205 }
206 if (program.loc) {
207 program.loc.end = extra.lastToken.loc.end;
208 }
209 program.end = extra.lastToken.end;
210 }
211
212
213 /*
214 * https://github.com/eslint/espree/issues/349
215 * Ensure that template elements have correct range information.
216 * This is one location where Acorn produces a different value
217 * for its start and end properties vs. the values present in the
218 * range property. In order to avoid confusion, we set the start
219 * and end properties to the values that are present in range.
220 * This is done here, instead of in finishNode(), because Acorn
221 * uses the values of start and end internally while parsing, making
222 * it dangerous to change those values while parsing is ongoing.
223 * By waiting until the end of parsing, we can safely change these
224 * values without affect any other part of the process.
225 */
226 this[STATE].templateElements.forEach(templateElement => {
227 const startOffset = -1;
228 const endOffset = templateElement.tail ? 1 : 2;
229
230 templateElement.start += startOffset;
231 templateElement.end += endOffset;
232
233 if (templateElement.range) {
234 templateElement.range[0] += startOffset;
235 templateElement.range[1] += endOffset;
236 }
237
238 if (templateElement.loc) {
239 templateElement.loc.start.column += startOffset;
240 templateElement.loc.end.column += endOffset;
241 }
242 });
243
244 return program;
245 }
246
247 parseTopLevel(node) {
248 if (this[STATE].impliedStrict) {
249 this.strict = true;
250 }
251 return super.parseTopLevel(node);
252 }
253
254 /**
255 * Overwrites the default raise method to throw Esprima-style errors.
256 * @param {int} pos The position of the error.
257 * @param {string} message The error message.
258 * @throws {SyntaxError} A syntax error.
259 * @returns {void}
260 */
261 raise(pos, message) {
262 const loc = Parser.acorn.getLineInfo(this.input, pos);
263 const err = new SyntaxError(message);
264
265 err.index = pos;
266 err.lineNumber = loc.line;
267 err.column = loc.column + 1; // acorn uses 0-based columns
268 throw err;
269 }
270
271 /**
272 * Overwrites the default raise method to throw Esprima-style errors.
273 * @param {int} pos The position of the error.
274 * @param {string} message The error message.
275 * @throws {SyntaxError} A syntax error.
276 * @returns {void}
277 */
278 raiseRecoverable(pos, message) {
279 this.raise(pos, message);
280 }
281
282 /**
283 * Overwrites the default unexpected method to throw Esprima-style errors.
284 * @param {int} pos The position of the error.
285 * @throws {SyntaxError} A syntax error.
286 * @returns {void}
287 */
288 unexpected(pos) {
289 let message = "Unexpected token";
290
291 if (pos !== null && pos !== void 0) {
292 this.pos = pos;
293
294 if (this.options.locations) {
295 while (this.pos < this.lineStart) {
296 this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
297 --this.curLine;
298 }
299 }
300
301 this.nextToken();
302 }
303
304 if (this.end > this.start) {
305 message += ` ${this.input.slice(this.start, this.end)}`;
306 }
307
308 this.raise(this.start, message);
309 }
310
311 /*
312 * Esprima-FB represents JSX strings as tokens called "JSXText", but Acorn-JSX
313 * uses regular tt.string without any distinction between this and regular JS
314 * strings. As such, we intercept an attempt to read a JSX string and set a flag
315 * on extra so that when tokens are converted, the next token will be switched
316 * to JSXText via onToken.
317 */
318 jsx_readString(quote) { // eslint-disable-line camelcase -- required by API
319 const result = super.jsx_readString(quote);
320
321 if (this.type === tokTypes.string) {
322 this[STATE].jsxAttrValueToken = true;
323 }
324 return result;
325 }
326
327 /**
328 * Performs last-minute Esprima-specific compatibility checks and fixes.
329 * @param {ASTNode} result The node to check.
330 * @returns {ASTNode} The finished node.
331 */
332 [ESPRIMA_FINISH_NODE](result) {
333
334 // Acorn doesn't count the opening and closing backticks as part of templates
335 // so we have to adjust ranges/locations appropriately.
336 if (result.type === "TemplateElement") {
337
338 // save template element references to fix start/end later
339 this[STATE].templateElements.push(result);
340 }
341
342 if (result.type.includes("Function") && !result.generator) {
343 result.generator = false;
344 }
345
346 return result;
347 }
348 };
349};
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