RAHHH

backend/frontend/node_modules/tcomb/lib/match.js

@@ -0,0 +1,34 @@
+var assert = require('./assert');
+var isFunction = require('./isFunction');
+var isType = require('./isType');
+var Any = require('./Any');
+
+module.exports = function match(x) {
+  var type, guard, f, count;
+  for (var i = 1, len = arguments.length; i < len; ) {
+    type = arguments[i];
+    guard = arguments[i + 1];
+    f = arguments[i + 2];
+
+    if (isFunction(f) && !isType(f)) {
+      i = i + 3;
+    }
+    else {
+      f = guard;
+      guard = Any.is;
+      i = i + 2;
+    }
+
+    if (process.env.NODE_ENV !== 'production') {
+      count = (count || 0) + 1;
+      assert(isType(type), function () { return 'Invalid type in clause #' + count; });
+      assert(isFunction(guard), function () { return 'Invalid guard in clause #' + count; });
+      assert(isFunction(f), function () { return 'Invalid block in clause #' + count; });
+    }
+
+    if (type.is(x) && guard(x)) {
+      return f(x);
+    }
+  }
+  assert.fail('Match error');
+};