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qwen/nodejs/node_modules/espree/lib/espree.js

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+/* eslint no-param-reassign: 0 -- stylistic choice */
+
+import TokenTranslator from "./token-translator.js";
+import { normalizeOptions } from "./options.js";
+
+
+const STATE = Symbol("espree's internal state");
+const ESPRIMA_FINISH_NODE = Symbol("espree's esprimaFinishNode");
+
+
+/**
+ * Converts an Acorn comment to a Esprima comment.
+ * @param {boolean} block True if it's a block comment, false if not.
+ * @param {string} text The text of the comment.
+ * @param {int} start The index at which the comment starts.
+ * @param {int} end The index at which the comment ends.
+ * @param {Location} startLoc The location at which the comment starts.
+ * @param {Location} endLoc The location at which the comment ends.
+ * @param {string} code The source code being parsed.
+ * @returns {Object} The comment object.
+ * @private
+ */
+function convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code) {
+    let type;
+
+    if (block) {
+        type = "Block";
+    } else if (code.slice(start, start + 2) === "#!") {
+        type = "Hashbang";
+    } else {
+        type = "Line";
+    }
+
+    const comment = {
+        type,
+        value: text
+    };
+
+    if (typeof start === "number") {
+        comment.start = start;
+        comment.end = end;
+        comment.range = [start, end];
+    }
+
+    if (typeof startLoc === "object") {
+        comment.loc = {
+            start: startLoc,
+            end: endLoc
+        };
+    }
+
+    return comment;
+}
+
+export default () => Parser => {
+    const tokTypes = Object.assign({}, Parser.acorn.tokTypes);
+
+    if (Parser.acornJsx) {
+        Object.assign(tokTypes, Parser.acornJsx.tokTypes);
+    }
+
+    return class Espree extends Parser {
+        constructor(opts, code) {
+            if (typeof opts !== "object" || opts === null) {
+                opts = {};
+            }
+            if (typeof code !== "string" && !(code instanceof String)) {
+                code = String(code);
+            }
+
+            // save original source type in case of commonjs
+            const originalSourceType = opts.sourceType;
+            const options = normalizeOptions(opts);
+            const ecmaFeatures = options.ecmaFeatures || {};
+            const tokenTranslator =
+                options.tokens === true
+                    ? new TokenTranslator(tokTypes, code)
+                    : null;
+
+            /*
+             * Data that is unique to Espree and is not represented internally
+             * in Acorn.
+             *
+             * For ES2023 hashbangs, Espree will call `onComment()` during the
+             * constructor, so we must define state before having access to
+             * `this`.
+             */
+            const state = {
+                originalSourceType: originalSourceType || options.sourceType,
+                tokens: tokenTranslator ? [] : null,
+                comments: options.comment === true ? [] : null,
+                impliedStrict: ecmaFeatures.impliedStrict === true && options.ecmaVersion >= 5,
+                ecmaVersion: options.ecmaVersion,
+                jsxAttrValueToken: false,
+                lastToken: null,
+                templateElements: []
+            };
+
+            // Initialize acorn parser.
+            super({
+
+                // do not use spread, because we don't want to pass any unknown options to acorn
+                ecmaVersion: options.ecmaVersion,
+                sourceType: options.sourceType,
+                ranges: options.ranges,
+                locations: options.locations,
+                allowReserved: options.allowReserved,
+
+                // Truthy value is true for backward compatibility.
+                allowReturnOutsideFunction: options.allowReturnOutsideFunction,
+
+                // Collect tokens
+                onToken(token) {
+                    if (tokenTranslator) {
+
+                        // Use `tokens`, `ecmaVersion`, and `jsxAttrValueToken` in the state.
+                        tokenTranslator.onToken(token, state);
+                    }
+                    if (token.type !== tokTypes.eof) {
+                        state.lastToken = token;
+                    }
+                },
+
+                // Collect comments
+                onComment(block, text, start, end, startLoc, endLoc) {
+                    if (state.comments) {
+                        const comment = convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code);
+
+                        state.comments.push(comment);
+                    }
+                }
+            }, code);
+
+            /*
+             * We put all of this data into a symbol property as a way to avoid
+             * potential naming conflicts with future versions of Acorn.
+             */
+            this[STATE] = state;
+        }
+
+        tokenize() {
+            do {
+                this.next();
+            } while (this.type !== tokTypes.eof);
+
+            // Consume the final eof token
+            this.next();
+
+            const extra = this[STATE];
+            const tokens = extra.tokens;
+
+            if (extra.comments) {
+                tokens.comments = extra.comments;
+            }
+
+            return tokens;
+        }
+
+        finishNode(...args) {
+            const result = super.finishNode(...args);
+
+            return this[ESPRIMA_FINISH_NODE](result);
+        }
+
+        finishNodeAt(...args) {
+            const result = super.finishNodeAt(...args);
+
+            return this[ESPRIMA_FINISH_NODE](result);
+        }
+
+        parse() {
+            const extra = this[STATE];
+            const program = super.parse();
+
+            program.sourceType = extra.originalSourceType;
+
+            if (extra.comments) {
+                program.comments = extra.comments;
+            }
+            if (extra.tokens) {
+                program.tokens = extra.tokens;
+            }
+
+            /*
+             * Adjust opening and closing position of program to match Esprima.
+             * Acorn always starts programs at range 0 whereas Esprima starts at the
+             * first AST node's start (the only real difference is when there's leading
+             * whitespace or leading comments). Acorn also counts trailing whitespace
+             * as part of the program whereas Esprima only counts up to the last token.
+             */
+            if (program.body.length) {
+                const [firstNode] = program.body;
+
+                if (program.range) {
+                    program.range[0] = firstNode.range[0];
+                }
+                if (program.loc) {
+                    program.loc.start = firstNode.loc.start;
+                }
+                program.start = firstNode.start;
+            }
+            if (extra.lastToken) {
+                if (program.range) {
+                    program.range[1] = extra.lastToken.range[1];
+                }
+                if (program.loc) {
+                    program.loc.end = extra.lastToken.loc.end;
+                }
+                program.end = extra.lastToken.end;
+            }
+
+
+            /*
+             * https://github.com/eslint/espree/issues/349
+             * Ensure that template elements have correct range information.
+             * This is one location where Acorn produces a different value
+             * for its start and end properties vs. the values present in the
+             * range property. In order to avoid confusion, we set the start
+             * and end properties to the values that are present in range.
+             * This is done here, instead of in finishNode(), because Acorn
+             * uses the values of start and end internally while parsing, making
+             * it dangerous to change those values while parsing is ongoing.
+             * By waiting until the end of parsing, we can safely change these
+             * values without affect any other part of the process.
+             */
+            this[STATE].templateElements.forEach(templateElement => {
+                const startOffset = -1;
+                const endOffset = templateElement.tail ? 1 : 2;
+
+                templateElement.start += startOffset;
+                templateElement.end += endOffset;
+
+                if (templateElement.range) {
+                    templateElement.range[0] += startOffset;
+                    templateElement.range[1] += endOffset;
+                }
+
+                if (templateElement.loc) {
+                    templateElement.loc.start.column += startOffset;
+                    templateElement.loc.end.column += endOffset;
+                }
+            });
+
+            return program;
+        }
+
+        parseTopLevel(node) {
+            if (this[STATE].impliedStrict) {
+                this.strict = true;
+            }
+            return super.parseTopLevel(node);
+        }
+
+        /**
+         * Overwrites the default raise method to throw Esprima-style errors.
+         * @param {int} pos The position of the error.
+         * @param {string} message The error message.
+         * @throws {SyntaxError} A syntax error.
+         * @returns {void}
+         */
+        raise(pos, message) {
+            const loc = Parser.acorn.getLineInfo(this.input, pos);
+            const err = new SyntaxError(message);
+
+            err.index = pos;
+            err.lineNumber = loc.line;
+            err.column = loc.column + 1; // acorn uses 0-based columns
+            throw err;
+        }
+
+        /**
+         * Overwrites the default raise method to throw Esprima-style errors.
+         * @param {int} pos The position of the error.
+         * @param {string} message The error message.
+         * @throws {SyntaxError} A syntax error.
+         * @returns {void}
+         */
+        raiseRecoverable(pos, message) {
+            this.raise(pos, message);
+        }
+
+        /**
+         * Overwrites the default unexpected method to throw Esprima-style errors.
+         * @param {int} pos The position of the error.
+         * @throws {SyntaxError} A syntax error.
+         * @returns {void}
+         */
+        unexpected(pos) {
+            let message = "Unexpected token";
+
+            if (pos !== null && pos !== void 0) {
+                this.pos = pos;
+
+                if (this.options.locations) {
+                    while (this.pos < this.lineStart) {
+                        this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
+                        --this.curLine;
+                    }
+                }
+
+                this.nextToken();
+            }
+
+            if (this.end > this.start) {
+                message += ` ${this.input.slice(this.start, this.end)}`;
+            }
+
+            this.raise(this.start, message);
+        }
+
+        /*
+        * Esprima-FB represents JSX strings as tokens called "JSXText", but Acorn-JSX
+        * uses regular tt.string without any distinction between this and regular JS
+        * strings. As such, we intercept an attempt to read a JSX string and set a flag
+        * on extra so that when tokens are converted, the next token will be switched
+        * to JSXText via onToken.
+        */
+        jsx_readString(quote) { // eslint-disable-line camelcase -- required by API
+            const result = super.jsx_readString(quote);
+
+            if (this.type === tokTypes.string) {
+                this[STATE].jsxAttrValueToken = true;
+            }
+            return result;
+        }
+
+        /**
+         * Performs last-minute Esprima-specific compatibility checks and fixes.
+         * @param {ASTNode} result The node to check.
+         * @returns {ASTNode} The finished node.
+         */
+        [ESPRIMA_FINISH_NODE](result) {
+
+            // Acorn doesn't count the opening and closing backticks as part of templates
+            // so we have to adjust ranges/locations appropriately.
+            if (result.type === "TemplateElement") {
+
+                // save template element references to fix start/end later
+                this[STATE].templateElements.push(result);
+            }
+
+            if (result.type.includes("Function") && !result.generator) {
+                result.generator = false;
+            }
+
+            return result;
+        }
+    };
+};