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