634 lines
24 KiB
JavaScript
634 lines
24 KiB
JavaScript
/**
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* @fileoverview Object to handle access and retrieval of tokens.
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* @author Brandon Mills
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const assert = require("assert");
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const cursors = require("./cursors");
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const ForwardTokenCursor = require("./forward-token-cursor");
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const PaddedTokenCursor = require("./padded-token-cursor");
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const utils = require("./utils");
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const astUtils = require("../ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const TOKENS = Symbol("tokens");
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const COMMENTS = Symbol("comments");
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const INDEX_MAP = Symbol("indexMap");
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/**
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* Creates the map from locations to indices in `tokens`.
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*
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* The first/last location of tokens is mapped to the index of the token.
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* The first/last location of comments is mapped to the index of the next token of each comment.
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*
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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* @returns {Object} The map from locations to indices in `tokens`.
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* @private
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*/
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function createIndexMap(tokens, comments) {
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const map = Object.create(null);
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let tokenIndex = 0;
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let commentIndex = 0;
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let nextStart = 0;
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let range = null;
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while (tokenIndex < tokens.length || commentIndex < comments.length) {
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nextStart = (commentIndex < comments.length) ? comments[commentIndex].range[0] : Number.MAX_SAFE_INTEGER;
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while (tokenIndex < tokens.length && (range = tokens[tokenIndex].range)[0] < nextStart) {
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map[range[0]] = tokenIndex;
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map[range[1] - 1] = tokenIndex;
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tokenIndex += 1;
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}
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nextStart = (tokenIndex < tokens.length) ? tokens[tokenIndex].range[0] : Number.MAX_SAFE_INTEGER;
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while (commentIndex < comments.length && (range = comments[commentIndex].range)[0] < nextStart) {
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map[range[0]] = tokenIndex;
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map[range[1] - 1] = tokenIndex;
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commentIndex += 1;
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}
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}
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return map;
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}
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/**
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* Creates the cursor iterates tokens with options.
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*
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* @param {CursorFactory} factory - The cursor factory to initialize cursor.
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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* @param {Object} indexMap - The map from locations to indices in `tokens`.
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* @param {number} startLoc - The start location of the iteration range.
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* @param {number} endLoc - The end location of the iteration range.
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* @param {number|Function|Object} [opts=0] - The option object. If this is a number then it's `opts.skip`. If this is a function then it's `opts.filter`.
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* @param {boolean} [opts.includeComments=false] - The flag to iterate comments as well.
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* @param {Function|null} [opts.filter=null] - The predicate function to choose tokens.
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* @param {number} [opts.skip=0] - The count of tokens the cursor skips.
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* @returns {Cursor} The created cursor.
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* @private
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*/
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function createCursorWithSkip(factory, tokens, comments, indexMap, startLoc, endLoc, opts) {
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let includeComments = false;
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let skip = 0;
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let filter = null;
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if (typeof opts === "number") {
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skip = opts | 0;
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} else if (typeof opts === "function") {
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filter = opts;
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} else if (opts) {
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includeComments = !!opts.includeComments;
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skip = opts.skip | 0;
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filter = opts.filter || null;
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}
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assert(skip >= 0, "options.skip should be zero or a positive integer.");
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assert(!filter || typeof filter === "function", "options.filter should be a function.");
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return factory.createCursor(tokens, comments, indexMap, startLoc, endLoc, includeComments, filter, skip, -1);
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}
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/**
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* Creates the cursor iterates tokens with options.
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*
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* @param {CursorFactory} factory - The cursor factory to initialize cursor.
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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* @param {Object} indexMap - The map from locations to indices in `tokens`.
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* @param {number} startLoc - The start location of the iteration range.
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* @param {number} endLoc - The end location of the iteration range.
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* @param {number|Function|Object} [opts=0] - The option object. If this is a number then it's `opts.count`. If this is a function then it's `opts.filter`.
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* @param {boolean} [opts.includeComments] - The flag to iterate comments as well.
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* @param {Function|null} [opts.filter=null] - The predicate function to choose tokens.
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* @param {number} [opts.count=0] - The maximum count of tokens the cursor iterates. Zero is no iteration for backward compatibility.
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* @returns {Cursor} The created cursor.
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* @private
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*/
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function createCursorWithCount(factory, tokens, comments, indexMap, startLoc, endLoc, opts) {
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let includeComments = false;
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let count = 0;
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let countExists = false;
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let filter = null;
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if (typeof opts === "number") {
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count = opts | 0;
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countExists = true;
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} else if (typeof opts === "function") {
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filter = opts;
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} else if (opts) {
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includeComments = !!opts.includeComments;
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count = opts.count | 0;
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countExists = typeof opts.count === "number";
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filter = opts.filter || null;
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}
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assert(count >= 0, "options.count should be zero or a positive integer.");
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assert(!filter || typeof filter === "function", "options.filter should be a function.");
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return factory.createCursor(tokens, comments, indexMap, startLoc, endLoc, includeComments, filter, 0, countExists ? count : -1);
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}
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/**
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* Creates the cursor iterates tokens with options.
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* This is overload function of the below.
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*
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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* @param {Object} indexMap - The map from locations to indices in `tokens`.
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* @param {number} startLoc - The start location of the iteration range.
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* @param {number} endLoc - The end location of the iteration range.
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* @param {Function|Object} opts - The option object. If this is a function then it's `opts.filter`.
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* @param {boolean} [opts.includeComments] - The flag to iterate comments as well.
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* @param {Function|null} [opts.filter=null] - The predicate function to choose tokens.
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* @param {number} [opts.count=0] - The maximum count of tokens the cursor iterates. Zero is no iteration for backward compatibility.
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* @returns {Cursor} The created cursor.
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* @private
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*/
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/**
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* Creates the cursor iterates tokens with options.
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*
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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* @param {Object} indexMap - The map from locations to indices in `tokens`.
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* @param {number} startLoc - The start location of the iteration range.
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* @param {number} endLoc - The end location of the iteration range.
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* @param {number} [beforeCount=0] - The number of tokens before the node to retrieve.
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* @param {boolean} [afterCount=0] - The number of tokens after the node to retrieve.
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* @returns {Cursor} The created cursor.
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* @private
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*/
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function createCursorWithPadding(tokens, comments, indexMap, startLoc, endLoc, beforeCount, afterCount) {
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if (typeof beforeCount === "undefined" && typeof afterCount === "undefined") {
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return new ForwardTokenCursor(tokens, comments, indexMap, startLoc, endLoc);
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}
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if (typeof beforeCount === "number" || typeof beforeCount === "undefined") {
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return new PaddedTokenCursor(tokens, comments, indexMap, startLoc, endLoc, beforeCount | 0, afterCount | 0);
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}
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return createCursorWithCount(cursors.forward, tokens, comments, indexMap, startLoc, endLoc, beforeCount);
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}
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/**
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* Gets comment tokens that are adjacent to the current cursor position.
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* @param {Cursor} cursor - A cursor instance.
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* @returns {Array} An array of comment tokens adjacent to the current cursor position.
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* @private
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*/
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function getAdjacentCommentTokensFromCursor(cursor) {
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const tokens = [];
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let currentToken = cursor.getOneToken();
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while (currentToken && astUtils.isCommentToken(currentToken)) {
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tokens.push(currentToken);
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currentToken = cursor.getOneToken();
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}
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return tokens;
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}
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//------------------------------------------------------------------------------
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// Exports
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//------------------------------------------------------------------------------
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/**
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* The token store.
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*
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* This class provides methods to get tokens by locations as fast as possible.
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* The methods are a part of public API, so we should be careful if it changes this class.
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*
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* People can get tokens in O(1) by the hash map which is mapping from the location of tokens/comments to tokens.
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* Also people can get a mix of tokens and comments in O(log k), the k is the number of comments.
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* Assuming that comments to be much fewer than tokens, this does not make hash map from token's locations to comments to reduce memory cost.
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* This uses binary-searching instead for comments.
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*/
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module.exports = class TokenStore {
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/**
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* Initializes this token store.
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* @param {Token[]} tokens - The array of tokens.
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* @param {Comment[]} comments - The array of comments.
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*/
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constructor(tokens, comments) {
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this[TOKENS] = tokens;
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this[COMMENTS] = comments;
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this[INDEX_MAP] = createIndexMap(tokens, comments);
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}
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//--------------------------------------------------------------------------
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// Gets single token.
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//--------------------------------------------------------------------------
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/**
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* Gets the token starting at the specified index.
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* @param {number} offset - Index of the start of the token's range.
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* @param {Object} [options=0] - The option object.
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* @param {boolean} [options.includeComments=false] - The flag to iterate comments as well.
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* @returns {Token|null} The token starting at index, or null if no such token.
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*/
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getTokenByRangeStart(offset, options) {
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const includeComments = options && options.includeComments;
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const token = cursors.forward.createBaseCursor(
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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offset,
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-1,
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includeComments
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).getOneToken();
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if (token && token.range[0] === offset) {
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return token;
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}
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return null;
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}
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/**
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* Gets the first token of the given node.
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* @param {ASTNode} node - The AST node.
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* @param {number|Function|Object} [options=0] - The option object. If this is a number then it's `options.skip`. If this is a function then it's `options.filter`.
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* @param {boolean} [options.includeComments=false] - The flag to iterate comments as well.
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* @param {Function|null} [options.filter=null] - The predicate function to choose tokens.
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* @param {number} [options.skip=0] - The count of tokens the cursor skips.
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* @returns {Token|null} An object representing the token.
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*/
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getFirstToken(node, options) {
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return createCursorWithSkip(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[0],
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node.range[1],
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options
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).getOneToken();
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}
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/**
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* Gets the last token of the given node.
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* @param {ASTNode} node - The AST node.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstToken()
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* @returns {Token|null} An object representing the token.
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*/
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getLastToken(node, options) {
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return createCursorWithSkip(
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cursors.backward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[0],
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node.range[1],
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options
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).getOneToken();
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}
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/**
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* Gets the token that precedes a given node or token.
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* @param {ASTNode|Token|Comment} node - The AST node or token.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstToken()
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* @returns {Token|null} An object representing the token.
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*/
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getTokenBefore(node, options) {
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return createCursorWithSkip(
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cursors.backward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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-1,
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node.range[0],
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options
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).getOneToken();
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}
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/**
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* Gets the token that follows a given node or token.
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* @param {ASTNode|Token|Comment} node - The AST node or token.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstToken()
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* @returns {Token|null} An object representing the token.
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*/
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getTokenAfter(node, options) {
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return createCursorWithSkip(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[1],
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-1,
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options
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).getOneToken();
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}
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/**
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* Gets the first token between two non-overlapping nodes.
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* @param {ASTNode|Token|Comment} left - Node before the desired token range.
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* @param {ASTNode|Token|Comment} right - Node after the desired token range.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstToken()
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* @returns {Token|null} An object representing the token.
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*/
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getFirstTokenBetween(left, right, options) {
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return createCursorWithSkip(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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left.range[1],
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right.range[0],
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options
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).getOneToken();
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}
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/**
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* Gets the last token between two non-overlapping nodes.
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* @param {ASTNode|Token|Comment} left Node before the desired token range.
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* @param {ASTNode|Token|Comment} right Node after the desired token range.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstToken()
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* @returns {Token|null} An object representing the token.
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*/
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getLastTokenBetween(left, right, options) {
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return createCursorWithSkip(
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cursors.backward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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left.range[1],
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right.range[0],
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options
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).getOneToken();
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}
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/**
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* Gets the token that precedes a given node or token in the token stream.
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* This is defined for backward compatibility. Use `includeComments` option instead.
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* TODO: We have a plan to remove this in a future major version.
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* @param {ASTNode|Token|Comment} node The AST node or token.
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* @param {number} [skip=0] A number of tokens to skip.
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* @returns {Token|null} An object representing the token.
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* @deprecated
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*/
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getTokenOrCommentBefore(node, skip) {
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return this.getTokenBefore(node, { includeComments: true, skip });
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}
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/**
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* Gets the token that follows a given node or token in the token stream.
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* This is defined for backward compatibility. Use `includeComments` option instead.
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* TODO: We have a plan to remove this in a future major version.
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* @param {ASTNode|Token|Comment} node The AST node or token.
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* @param {number} [skip=0] A number of tokens to skip.
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* @returns {Token|null} An object representing the token.
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* @deprecated
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*/
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getTokenOrCommentAfter(node, skip) {
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return this.getTokenAfter(node, { includeComments: true, skip });
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}
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//--------------------------------------------------------------------------
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// Gets multiple tokens.
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//--------------------------------------------------------------------------
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/**
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* Gets the first `count` tokens of the given node.
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* @param {ASTNode} node - The AST node.
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* @param {number|Function|Object} [options=0] - The option object. If this is a number then it's `options.count`. If this is a function then it's `options.filter`.
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* @param {boolean} [options.includeComments=false] - The flag to iterate comments as well.
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* @param {Function|null} [options.filter=null] - The predicate function to choose tokens.
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* @param {number} [options.count=0] - The maximum count of tokens the cursor iterates.
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* @returns {Token[]} Tokens.
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*/
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getFirstTokens(node, options) {
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return createCursorWithCount(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[0],
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node.range[1],
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options
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).getAllTokens();
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}
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/**
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* Gets the last `count` tokens of the given node.
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* @param {ASTNode} node - The AST node.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstTokens()
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* @returns {Token[]} Tokens.
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*/
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getLastTokens(node, options) {
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return createCursorWithCount(
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cursors.backward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[0],
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node.range[1],
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options
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).getAllTokens().reverse();
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}
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/**
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* Gets the `count` tokens that precedes a given node or token.
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* @param {ASTNode|Token|Comment} node - The AST node or token.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstTokens()
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* @returns {Token[]} Tokens.
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*/
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getTokensBefore(node, options) {
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return createCursorWithCount(
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cursors.backward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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-1,
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node.range[0],
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options
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).getAllTokens().reverse();
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}
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|
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/**
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* Gets the `count` tokens that follows a given node or token.
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* @param {ASTNode|Token|Comment} node - The AST node or token.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstTokens()
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* @returns {Token[]} Tokens.
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*/
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getTokensAfter(node, options) {
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return createCursorWithCount(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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node.range[1],
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-1,
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options
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).getAllTokens();
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}
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|
|
/**
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* Gets the first `count` tokens between two non-overlapping nodes.
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* @param {ASTNode|Token|Comment} left - Node before the desired token range.
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* @param {ASTNode|Token|Comment} right - Node after the desired token range.
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* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstTokens()
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* @returns {Token[]} Tokens between left and right.
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*/
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getFirstTokensBetween(left, right, options) {
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return createCursorWithCount(
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cursors.forward,
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this[TOKENS],
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this[COMMENTS],
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this[INDEX_MAP],
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left.range[1],
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right.range[0],
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options
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).getAllTokens();
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}
|
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|
|
/**
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* Gets the last `count` tokens between two non-overlapping nodes.
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* @param {ASTNode|Token|Comment} left Node before the desired token range.
|
|
* @param {ASTNode|Token|Comment} right Node after the desired token range.
|
|
* @param {number|Function|Object} [options=0] - The option object. Same options as getFirstTokens()
|
|
* @returns {Token[]} Tokens between left and right.
|
|
*/
|
|
getLastTokensBetween(left, right, options) {
|
|
return createCursorWithCount(
|
|
cursors.backward,
|
|
this[TOKENS],
|
|
this[COMMENTS],
|
|
this[INDEX_MAP],
|
|
left.range[1],
|
|
right.range[0],
|
|
options
|
|
).getAllTokens().reverse();
|
|
}
|
|
|
|
/**
|
|
* Gets all tokens that are related to the given node.
|
|
* @param {ASTNode} node - The AST node.
|
|
* @param {Function|Object} options The option object. If this is a function then it's `options.filter`.
|
|
* @param {boolean} [options.includeComments=false] - The flag to iterate comments as well.
|
|
* @param {Function|null} [options.filter=null] - The predicate function to choose tokens.
|
|
* @param {number} [options.count=0] - The maximum count of tokens the cursor iterates.
|
|
* @returns {Token[]} Array of objects representing tokens.
|
|
*/
|
|
/**
|
|
* Gets all tokens that are related to the given node.
|
|
* @param {ASTNode} node - The AST node.
|
|
* @param {int} [beforeCount=0] - The number of tokens before the node to retrieve.
|
|
* @param {int} [afterCount=0] - The number of tokens after the node to retrieve.
|
|
* @returns {Token[]} Array of objects representing tokens.
|
|
*/
|
|
getTokens(node, beforeCount, afterCount) {
|
|
return createCursorWithPadding(
|
|
this[TOKENS],
|
|
this[COMMENTS],
|
|
this[INDEX_MAP],
|
|
node.range[0],
|
|
node.range[1],
|
|
beforeCount,
|
|
afterCount
|
|
).getAllTokens();
|
|
}
|
|
|
|
/**
|
|
* Gets all of the tokens between two non-overlapping nodes.
|
|
* @param {ASTNode|Token|Comment} left Node before the desired token range.
|
|
* @param {ASTNode|Token|Comment} right Node after the desired token range.
|
|
* @param {Function|Object} options The option object. If this is a function then it's `options.filter`.
|
|
* @param {boolean} [options.includeComments=false] - The flag to iterate comments as well.
|
|
* @param {Function|null} [options.filter=null] - The predicate function to choose tokens.
|
|
* @param {number} [options.count=0] - The maximum count of tokens the cursor iterates.
|
|
* @returns {Token[]} Tokens between left and right.
|
|
*/
|
|
/**
|
|
* Gets all of the tokens between two non-overlapping nodes.
|
|
* @param {ASTNode|Token|Comment} left Node before the desired token range.
|
|
* @param {ASTNode|Token|Comment} right Node after the desired token range.
|
|
* @param {int} [padding=0] Number of extra tokens on either side of center.
|
|
* @returns {Token[]} Tokens between left and right.
|
|
*/
|
|
getTokensBetween(left, right, padding) {
|
|
return createCursorWithPadding(
|
|
this[TOKENS],
|
|
this[COMMENTS],
|
|
this[INDEX_MAP],
|
|
left.range[1],
|
|
right.range[0],
|
|
padding,
|
|
padding
|
|
).getAllTokens();
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Others.
|
|
//--------------------------------------------------------------------------
|
|
|
|
/**
|
|
* Checks whether any comments exist or not between the given 2 nodes.
|
|
*
|
|
* @param {ASTNode} left - The node to check.
|
|
* @param {ASTNode} right - The node to check.
|
|
* @returns {boolean} `true` if one or more comments exist.
|
|
*/
|
|
commentsExistBetween(left, right) {
|
|
const index = utils.search(this[COMMENTS], left.range[1]);
|
|
|
|
return (
|
|
index < this[COMMENTS].length &&
|
|
this[COMMENTS][index].range[1] <= right.range[0]
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Gets all comment tokens directly before the given node or token.
|
|
* @param {ASTNode|token} nodeOrToken The AST node or token to check for adjacent comment tokens.
|
|
* @returns {Array} An array of comments in occurrence order.
|
|
*/
|
|
getCommentsBefore(nodeOrToken) {
|
|
const cursor = createCursorWithCount(
|
|
cursors.backward,
|
|
this[TOKENS],
|
|
this[COMMENTS],
|
|
this[INDEX_MAP],
|
|
-1,
|
|
nodeOrToken.range[0],
|
|
{ includeComments: true }
|
|
);
|
|
|
|
return getAdjacentCommentTokensFromCursor(cursor).reverse();
|
|
}
|
|
|
|
/**
|
|
* Gets all comment tokens directly after the given node or token.
|
|
* @param {ASTNode|token} nodeOrToken The AST node or token to check for adjacent comment tokens.
|
|
* @returns {Array} An array of comments in occurrence order.
|
|
*/
|
|
getCommentsAfter(nodeOrToken) {
|
|
const cursor = createCursorWithCount(
|
|
cursors.forward,
|
|
this[TOKENS],
|
|
this[COMMENTS],
|
|
this[INDEX_MAP],
|
|
nodeOrToken.range[1],
|
|
-1,
|
|
{ includeComments: true }
|
|
);
|
|
|
|
return getAdjacentCommentTokensFromCursor(cursor);
|
|
}
|
|
|
|
/**
|
|
* Gets all comment tokens inside the given node.
|
|
* @param {ASTNode} node The AST node to get the comments for.
|
|
* @returns {Array} An array of comments in occurrence order.
|
|
*/
|
|
getCommentsInside(node) {
|
|
return this.getTokens(node, {
|
|
includeComments: true,
|
|
filter: astUtils.isCommentToken
|
|
});
|
|
}
|
|
};
|