eslint
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An AST-based pattern checker for JavaScript.
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JavaScript
/**
* @fileoverview Define the cursor which iterates tokens and comments.
* @author Toru Nagashima
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const Cursor = require("./cursor");
const { getFirstIndex, search } = require("./utils");
//------------------------------------------------------------------------------
// Exports
//------------------------------------------------------------------------------
/**
* The cursor which iterates tokens and comments.
*/
module.exports = class ForwardTokenCommentCursor 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 = getFirstIndex(tokens, indexMap, startLoc);
this.commentIndex = search(comments, startLoc);
this.border = endLoc;
}
/** @inheritdoc */
moveNext() {
const token =
this.tokenIndex < this.tokens.length
? this.tokens[this.tokenIndex]
: null;
const comment =
this.commentIndex < this.comments.length
? this.comments[this.commentIndex]
: null;
if (token && (!comment || token.range[0] < comment.range[0])) {
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[1] <= this.border)
);
}
};