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node_modules/eslint/lib/source-code/token-store/backward-token-cursor.js

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+/**
+ * @fileoverview Define the cursor which iterates tokens only in reverse.
+ * @author Toru Nagashima
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const Cursor = require("./cursor");
+const utils = require("./utils");
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * The cursor which iterates tokens only in reverse.
+ */
+module.exports = class BackwardTokenCursor 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.index = utils.getLastIndex(tokens, indexMap, endLoc);
+        this.indexEnd = utils.getFirstIndex(tokens, indexMap, startLoc);
+    }
+
+    /** @inheritdoc */
+    moveNext() {
+        if (this.index >= this.indexEnd) {
+            this.current = this.tokens[this.index];
+            this.index -= 1;
+            return true;
+        }
+        return false;
+    }
+
+    /*
+     *
+     * Shorthand for performance.
+     *
+     */
+
+    /** @inheritdoc */
+    getOneToken() {
+        return (this.index >= this.indexEnd) ? this.tokens[this.index] : null;
+    }
+};