--- /dev/null
+/**
+ * @fileoverview Define the cursor which iterates tokens only.
+ * @author Toru Nagashima
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const Cursor = require("./cursor");
+const utils = require("./utils");
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * The cursor which iterates tokens only.
+ */
+module.exports = class ForwardTokenCursor 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.getFirstIndex(tokens, indexMap, startLoc);
+ this.indexEnd = utils.getLastIndex(tokens, indexMap, endLoc);
+ }
+
+ /** @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;
+ }
+
+ /** @inheritdoc */
+ getAllTokens() {
+ return this.tokens.slice(this.index, this.indexEnd + 1);
+ }
+};