the code

1 files changed, 82 insertions, 0 deletions

diff --git a/src/utility.js b/src/utility.js
new file mode 100644
index 00000000..447c52a6
--- /dev/null
+++ b/src/utility.js
@@ -0,0 +1,82 @@
+
+function dump(item) {
+  try {
+    return JSON.stringify(item);
+  } catch(e) {
+    var ret = [];
+    for (var i in item) {
+      var j = item[i];
+      if (typeof j === 'string' || typeof j === 'number') {
+        ret.push(i + ': ' + j);
+      } else {
+        ret.push(i + ': [?]');
+      }
+    }
+    return ret.join(', ');
+  }
+}
+
+function dumpKeys(item) {
+  var ret = [];
+  for (var i in item) {
+    var j = item[i];
+    if (typeof j === 'string' || typeof j === 'number') {
+      ret.push(i + ': ' + j);
+    } else {
+      ret.push(i + ': [?]');
+    }
+  }
+  return ret.join(', ');
+}
+
+function assertEq(a, b) {
+  if (a !== b) {
+    print("Stack: " + new Error().stack);
+    throw "Should have been equal: " + a + " : " + b;
+  }
+}
+
+function assertTrue(a) {
+  assertEq(!!a, true);
+}
+
+function dedup(items, ident) {
+  var seen = {};
+  if (ident) {
+    return items.filter(function(item) {
+      if (seen[item[ident]]) return false;
+      seen[item[ident]] = true;
+      return true;
+    });
+  } else {
+    return items.filter(function(item) {
+      if (seen[item]) return false;
+      seen[item] = true;
+      return true;
+    });
+  }
+}
+
+function range(size) {
+  var ret = [];
+  for (var i = 0; i < size; i++) ret.push(i);
+  return ret;
+}
+
+function searchable() {
+  var ret = {};
+  for (var i = 0; i < arguments.length; i++) {
+    ret[arguments[i]] = 0;
+  }
+  return ret;
+}
+
+function walkJSON(item, func) {
+  func(item);
+  for (x in item) {
+    if (typeof item[x] === 'object') {
+      walkJSON(item[x], func);
+    }
+  }
+}
+