Instrument blocks.js with getters for fields and inputs

src/engine/blocks.js

@@ -22,6 +22,13 @@ function Blocks () {
     this._stacks = [];
 }
 
+/**
+ * Blockly inputs that represent statements/substacks
+ * are prefixed with this string.
+ * @const{string}
+ */
+Blocks.SUBSTACK_INPUT_PREFIX = 'SUBSTACK';
+
 /**
  * Provide an object with metadata for the requested block ID.
  * @param {!string} blockId ID of block we have stored.
@@ -60,7 +67,7 @@ Blocks.prototype.getSubstack = function (id, substackNum) {
     if (typeof block === 'undefined') return null;
     if (!substackNum) substackNum = 1;
 
-    var inputName = 'SUBSTACK';
+    var inputName = Blocks.SUBSTACK_INPUT_PREFIX;
     if (substackNum > 1) {
         inputName += substackNum;
     }
@@ -80,6 +87,34 @@ Blocks.prototype.getOpcode = function (id) {
     return this._blocks[id].opcode;
 };
 
+/**
+ * Get all fields and their values for a block.
+ * @param {?string} id ID of block to query.
+ * @return {!Object} All fields and their values.
+ */
+Blocks.prototype.getFields = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    return this._blocks[id].fields;
+};
+
+/**
+ * Get all non-substack inputs for a block.
+ * @param {?string} id ID of block to query.
+ * @return {!Object} All non-substack inputs and their associated blocks.
+ */
+Blocks.prototype.getInputs = function (id) {
+    if (typeof this._blocks[id] === 'undefined') return null;
+    var inputs = {};
+    for (var input in this._blocks[id].inputs) {
+        // Ignore blocks prefixed with substack prefix.
+        if (input.substring(0, Blocks.SUBSTACK_INPUT_PREFIX.length)
+            != Blocks.SUBSTACK_INPUT_PREFIX) {
+            inputs[input] = this._blocks[id].inputs[input];
+        }
+    }
+    return inputs;
+};
+
 // ---------------------------------------------------------------------
 
 /**