Move constant implementation out of generated

pkg/analyzer/lib/context/declared_variables.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library analyzer.context.declared_variables;
+
+import 'dart:collection';
+
+import 'package:analyzer/dart/constant/value.dart';
+import 'package:analyzer/src/dart/constant/value.dart';
+import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
+
+/**
+ * An object used to provide access to the values of variables that have been
+ * defined on the command line using the `-D` option.
+ *
+ * Clients may not extend, implement or mix-in this class.
+ */
+class DeclaredVariables {
+  /**
+   * A table mapping the names of declared variables to their values.
+   */
+  HashMap<String, String> _declaredVariables = new HashMap<String, String>();
+
+  /**
+   * Define a variable with the given [name] to have the given [value].
+   */
+  void define(String name, String value) {
+    _declaredVariables[name] = value;
+  }
+
+  /**
+   * Return the value of the variable with the given [name] interpreted as a
+   * 'boolean' value. If the variable is not defined (or [name] is `null`), a
+   * DartObject representing "unknown" is returned. If the value cannot be
+   * parsed as a boolean, a DartObject representing 'null' is returned. The
+   * [typeProvider] is the type provider used to find the type 'bool'.
+   */
+  DartObject getBool(TypeProvider typeProvider, String name) {
+    String value = _declaredVariables[name];
+    if (value == null) {
+      return new DartObjectImpl(typeProvider.boolType, BoolState.UNKNOWN_VALUE);
+    }
+    if (value == "true") {
+      return new DartObjectImpl(typeProvider.boolType, BoolState.TRUE_STATE);
+    } else if (value == "false") {
+      return new DartObjectImpl(typeProvider.boolType, BoolState.FALSE_STATE);
+    }
+    return new DartObjectImpl(typeProvider.nullType, NullState.NULL_STATE);
+  }
+
+  /**
+   * Return the value of the variable with the given [name] interpreted as an
+   * integer value. If the variable is not defined (or [name] is `null`), a
+   * DartObject representing "unknown" is returned. If the value cannot be
+   * parsed as an integer, a DartObject representing 'null' is returned.
+   */
+  DartObject getInt(TypeProvider typeProvider, String name) {
+    String value = _declaredVariables[name];
+    if (value == null) {
+      return new DartObjectImpl(typeProvider.intType, IntState.UNKNOWN_VALUE);
+    }
+    int bigInteger;
+    try {
+      bigInteger = int.parse(value);
+    } on FormatException {
+      return new DartObjectImpl(typeProvider.nullType, NullState.NULL_STATE);
+    }
+    return new DartObjectImpl(typeProvider.intType, new IntState(bigInteger));
+  }
+
+  /**
+   * Return the value of the variable with the given [name] interpreted as a
+   * String value, or `null` if the variable is not defined. Return the value of
+   * the variable with the given name interpreted as a String value. If the
+   * variable is not defined (or [name] is `null`), a DartObject representing
+   * "unknown" is returned. The [typeProvider] is the type provider used to find
+   * the type 'String'.
+   */
+  DartObject getString(TypeProvider typeProvider, String name) {
+    String value = _declaredVariables[name];
+    if (value == null) {
+      return new DartObjectImpl(
+          typeProvider.stringType, StringState.UNKNOWN_VALUE);
+    }
+    return new DartObjectImpl(typeProvider.stringType, new StringState(value));
+  }
+}