RAHHH

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

@@ -0,0 +1,83 @@
+var assert = require('./assert');
+var isTypeName = require('./isTypeName');
+var isFunction = require('./isFunction');
+var getTypeName = require('./getTypeName');
+var isIdentity = require('./isIdentity');
+var isArray = require('./isArray');
+var create = require('./create');
+var is = require('./is');
+
+function getDefaultName(types) {
+  return '[' + types.map(getTypeName).join(', ') + ']';
+}
+
+function tuple(types, name) {
+
+  if (process.env.NODE_ENV !== 'production') {
+    assert(isArray(types) && types.every(isFunction), function () { return 'Invalid argument types ' + assert.stringify(types) + ' supplied to tuple(types, [name]) combinator (expected an array of types)'; });
+    assert(isTypeName(name), function () { return 'Invalid argument name ' + assert.stringify(name) + ' supplied to tuple(types, [name]) combinator (expected a string)'; });
+  }
+
+  var displayName = name || getDefaultName(types);
+  var identity = types.every(isIdentity);
+
+  function Tuple(value, path) {
+
+    if (process.env.NODE_ENV === 'production') {
+      if (identity) {
+        return value;
+      }
+    }
+
+    if (process.env.NODE_ENV !== 'production') {
+      path = path || [displayName];
+      assert(isArray(value) && value.length === types.length, function () { return 'Invalid value ' + assert.stringify(value) + ' supplied to ' + path.join('/') + ' (expected an array of length ' + types.length + ')'; });
+    }
+
+    var idempotent = true;
+    var ret = [];
+    for (var i = 0, len = types.length; i < len; i++) {
+      var expected = types[i];
+      var actual = value[i];
+      var instance = create(expected, actual, ( process.env.NODE_ENV !== 'production' ? path.concat(i + ': ' + getTypeName(expected)) : null ));
+      idempotent = idempotent && ( actual === instance );
+      ret.push(instance);
+    }
+
+    if (idempotent) { // implements idempotency
+      ret = value;
+    }
+
+    if (process.env.NODE_ENV !== 'production') {
+      Object.freeze(ret);
+    }
+
+    return ret;
+  }
+
+  Tuple.meta = {
+    kind: 'tuple',
+    types: types,
+    name: name,
+    identity: identity
+  };
+
+  Tuple.displayName = displayName;
+
+  Tuple.is = function (x) {
+    return isArray(x) &&
+      x.length === types.length &&
+      types.every(function (type, i) {
+        return is(x[i], type);
+      });
+  };
+
+  Tuple.update = function (instance, patch) {
+    return Tuple(assert.update(instance, patch));
+  };
+
+  return Tuple;
+}
+
+tuple.getDefaultName = getDefaultName;
+module.exports = tuple;