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codeql-action/node_modules/eslint/lib/source-code/token-store/backward-token-comment-cursor.js
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/** | |
* @fileoverview Define the cursor which iterates tokens and comments in reverse. | |
* @author Toru Nagashima | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Requirements | |
//------------------------------------------------------------------------------ | |
const Cursor = require("./cursor"); | |
const utils = require("./utils"); | |
//------------------------------------------------------------------------------ | |
// Exports | |
//------------------------------------------------------------------------------ | |
/** | |
* The cursor which iterates tokens and comments in reverse. | |
*/ | |
module.exports = class BackwardTokenCommentCursor extends Cursor { | |
/** | |
* Initializes this 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. | |
*/ | |
constructor(tokens, comments, indexMap, startLoc, endLoc) { | |
super(); | |
this.tokens = tokens; | |
this.comments = comments; | |
this.tokenIndex = utils.getLastIndex(tokens, indexMap, endLoc); | |
this.commentIndex = utils.search(comments, endLoc) - 1; | |
this.border = startLoc; | |
} | |
/** @inheritdoc */ | |
moveNext() { | |
const token = (this.tokenIndex >= 0) ? this.tokens[this.tokenIndex] : null; | |
const comment = (this.commentIndex >= 0) ? this.comments[this.commentIndex] : null; | |
if (token && (!comment || token.range[1] > comment.range[1])) { | |
this.current = token; | |
this.tokenIndex -= 1; | |
} else if (comment) { | |
this.current = comment; | |
this.commentIndex -= 1; | |
} else { | |
this.current = null; | |
} | |
return Boolean(this.current) && (this.border === -1 || this.current.range[0] >= this.border); | |
} | |
}; |