Add a new Int node to parse intBE, intLE, uIntBE and uIntLE values.

src/builder.ts

@@ -38,6 +38,22 @@ export class Builder {
     return new node.Match(name);
   }
 
+  public intBE(name: string, bytes: number): node.Int {
+    return new node.Int(name, bytes, true, false);
+  }
+
+  public intLE(name: string, bytes: number): node.Int {
+    return new node.Int(name, bytes, true, true);
+  }
+
+  public uIntBE(name: string, bytes: number): node.Int {
+    return new node.Int(name, bytes, false, false);
+  }
+
+  public uIntLE(name: string, bytes: number): node.Int {
+    return new node.Int(name, bytes, false, true);
+  }
+
   /**
    * Create terminal error node. Returns error code to user, and sets reason
    * in the parser's state object.

src/node/index.ts

@@ -6,3 +6,4 @@ export { Match } from './match';
 export { Pause } from './pause';
 export { SpanStart } from './span-start';
 export { SpanEnd } from './span-end';
+export { Int } from './int';

src/node/int.ts

@@ -0,0 +1,28 @@
+import * as assert from 'assert';
+
+import { Node } from './base';
+
+function buildName(field: string, bytes: number, signed: boolean, littleEndian: boolean) {
+  const type = signed ? 'int' : 'uint';
+  const bits = bytes * 8;
+  const endianness = littleEndian ? 'le' : 'be';
+
+  if (bytes > 1) {
+    return `${field}_${type}_${bits}_${endianness}`;
+  } else {
+    return `${field}_${type}_${bits}`;
+  }
+}
+
+export class Int extends Node {
+  /**
+   * @param field  State's property name
+   */
+  constructor(public readonly field: string, public readonly bytes: number, public readonly signed: boolean, public readonly littleEndian: boolean) {
+    super(buildName(field, bytes, signed, littleEndian));
+
+    if (/^_/.test(field)) {
+      throw new Error(`Can't use internal field in \`Int\`: "${field}"`);
+    }
+  }
+}