1 files changed, 19 insertions, 0 deletions
diff --git a/llparse-builder/src/node/consume.ts b/llparse-builder/src/node/consume.ts
new file mode 100644
index 0000000..eff4037
--- /dev/null
+++ b/llparse-builder/src/node/consume.ts
@@ -0,0 +1,19 @@
+import * as assert from 'assert';
+import { Node } from './base';
+
+/**
+ * This node consumes number of characters specified by state's property with
+ * name `field` from the input, and forwards execution to `otherwise` node.
+ */
+export class Consume extends Node {
+  /**
+   * @param field  State's property name
+   */
+  constructor(public readonly field: string) {
+    super('consume_' + field);
+
+    if (/^_/.test(field)) {
+      throw new Error(`Can't use internal field in \`consume()\`: "${field}"`);
+    }
+  }
+}