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polymer_expressions/lib/expression.dart

Index: polymer_expressions/lib/expression.dart
diff --git a/polymer_expressions/lib/expression.dart b/polymer_expressions/lib/expression.dart
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-// Copyright (c) 2013, 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 polymer_expressions.expression;
-
-import 'visitor.dart';
-
-// Helper functions for building expression trees programmatically
-
-EmptyExpression empty() => const EmptyExpression();
-Literal literal(v) => new Literal(v);
-ListLiteral listLiteral(List<Expression> items) => new ListLiteral(items);
-MapLiteral mapLiteral(List<MapLiteralEntry> entries) => new MapLiteral(entries);
-MapLiteralEntry mapLiteralEntry(Literal key, Expression value) =>
-    new MapLiteralEntry(key, value);
-Identifier ident(String v) => new Identifier(v);
-ParenthesizedExpression paren(Expression e) => new ParenthesizedExpression(e);
-UnaryOperator unary(String op, Expression e) => new UnaryOperator(op, e);
-BinaryOperator binary(Expression l, String op, Expression r) =>
-    new BinaryOperator(l, op, r);
-Getter getter(Expression e, String m) => new Getter(e, m);
-Index index(Expression e, Expression a) => new Index(e, a);
-Invoke invoke(Expression e, String m, List<Expression> a) =>
-    new Invoke(e, m, a);
-InExpression inExpr(Expression l, Expression r) => new InExpression(l, r);
-AsExpression asExpr(Expression l, Expression r) => new AsExpression(l, r);
-TernaryOperator ternary(Expression c, Expression t, Expression f) =>
-    new TernaryOperator(c, t, f);
-
-class AstFactory {
-  EmptyExpression empty() => const EmptyExpression();
-
-  Literal literal(v) => new Literal(v);
-
-  MapLiteral mapLiteral(List<MapLiteralEntry> entries) =>
-      new MapLiteral(entries);
-
-  MapLiteralEntry mapLiteralEntry(Literal key, Expression value) =>
-      new MapLiteralEntry(key, value);
-
-  Identifier identifier(String v) => new Identifier(v);
-
-  ParenthesizedExpression parenthesized(Expression e) =>
-      new ParenthesizedExpression(e);
-
-  UnaryOperator unary(String op, Expression e) => new UnaryOperator(op, e);
-
-  BinaryOperator binary(Expression l, String op, Expression r) =>
-      new BinaryOperator(l, op, r);
-
-  TernaryOperator ternary(Expression c, Expression t, Expression f) =>
-      new TernaryOperator(c, t, f);
-
-  Getter getter(Expression g, String n) => new Getter(g, n);
-
-  Index index(Expression e, Expression a) => new Index(e, a);
-
-  Invoke invoke(Expression e, String m, List<Expression> a) =>
-      new Invoke(e, m, a);
-
-  InExpression inExpr(Expression l, Expression r) => new InExpression(l, r);
-
-  AsExpression asExpr(Expression l, Expression r) => new AsExpression(l, r);
-}
-
-/// Base class for all expressions
-abstract class Expression {
-  const Expression();
-  accept(Visitor v);
-}
-
-abstract class HasIdentifier {
-  String get identifier;
-  Expression get expr;
-}
-
-class EmptyExpression extends Expression {
-  const EmptyExpression();
-  accept(Visitor v) => v.visitEmptyExpression(this);
-}
-
-class Literal<T> extends Expression {
-  final T value;
-
-  Literal(this.value);
-
-  accept(Visitor v) => v.visitLiteral(this);
-
-  String toString() => (value is String) ? '"$value"' : '$value';
-
-  bool operator ==(o) => o is Literal<T> && o.value == value;
-
-  int get hashCode => value.hashCode;
-}
-
-class ListLiteral extends Expression {
-  final List<Expression> items;
-
-  ListLiteral(this.items);
-
-  accept(Visitor v) => v.visitListLiteral(this);
-
-  String toString() => "$items";
-
-  bool operator ==(o) => o is ListLiteral && _listEquals(o.items, items);
-
-  int get hashCode => _hashList(items);
-}
-
-class MapLiteral extends Expression {
-  final List<MapLiteralEntry> entries;
-
-  MapLiteral(this.entries);
-
-  accept(Visitor v) => v.visitMapLiteral(this);
-
-  String toString() => "{$entries}";
-
-  bool operator ==(o) => o is MapLiteral && _listEquals(o.entries, entries);
-
-  int get hashCode => _hashList(entries);
-}
-
-class MapLiteralEntry extends Expression {
-  final Literal key;
-  final Expression entryValue;
-
-  MapLiteralEntry(this.key, this.entryValue);
-
-  accept(Visitor v) => v.visitMapLiteralEntry(this);
-
-  String toString() => "$key: $entryValue";
-
-  bool operator ==(o) => o is MapLiteralEntry && o.key == key
-      && o.entryValue == entryValue;
-
-  int get hashCode => _JenkinsSmiHash.hash2(key.hashCode, entryValue.hashCode);
-}
-
-class ParenthesizedExpression extends Expression {
-  final Expression child;
-
-  ParenthesizedExpression(this.child);
-
-  accept(Visitor v) => v.visitParenthesizedExpression(this);
-
-  String toString() => '($child)';
-
-  bool operator ==(o) => o is ParenthesizedExpression && o.child == child;
-
-  int get hashCode => child.hashCode;
-}
-
-class Identifier extends Expression {
-  final String value;
-
-  Identifier(this.value);
-
-  accept(Visitor v) => v.visitIdentifier(this);
-
-  String toString() => value;
-
-  bool operator ==(o) => o is Identifier && o.value == value;
-
-  int get hashCode => value.hashCode;
-}
-
-class UnaryOperator extends Expression {
-  final String operator;
-  final Expression child;
-
-  UnaryOperator(this.operator, this.child);
-
-  accept(Visitor v) => v.visitUnaryOperator(this);
-
-  String toString() => '$operator $child';
-
-  bool operator ==(o) => o is UnaryOperator && o.operator == operator
-      && o.child == child;
-
-  int get hashCode => _JenkinsSmiHash.hash2(operator.hashCode, child.hashCode);
-}
-
-class BinaryOperator extends Expression {
-  final String operator;
-  final Expression left;
-  final Expression right;
-
-  BinaryOperator(this.left, this.operator, this.right);
-
-  accept(Visitor v) => v.visitBinaryOperator(this);
-
-  String toString() => '($left $operator $right)';
-
-  bool operator ==(o) => o is BinaryOperator && o.operator == operator
-      && o.left == left && o.right == right;
-
-  int get hashCode => _JenkinsSmiHash.hash3(operator.hashCode, left.hashCode,
-      right.hashCode);
-}
-
-class TernaryOperator extends Expression {
-  final Expression condition;
-  final Expression trueExpr;
-  final Expression falseExpr;
-
-  TernaryOperator(this.condition, this.trueExpr, this.falseExpr);
-
-  accept(Visitor v) => v.visitTernaryOperator(this);
-
-  String toString() => '($condition ? $trueExpr : $falseExpr)';
-
-  bool operator ==(o) => o is TernaryOperator
-      && o.condition == condition
-      && o.trueExpr == trueExpr
-      && o.falseExpr == falseExpr;
-
-  int get hashCode => _JenkinsSmiHash.hash3(condition.hashCode,
-      trueExpr.hashCode, falseExpr.hashCode);
-}
-
-class InExpression extends Expression implements HasIdentifier {
-  final Identifier left;
-  final Expression right;
-
-  InExpression(this.left, this.right);
-
-  accept(Visitor v) => v.visitInExpression(this);
-
-  String get identifier => left.value;
-
-  Expression get expr => right;
-
-  String toString() => '($left in $right)';
-
-  bool operator ==(o) => o is InExpression && o.left == left
-      && o.right == right;
-
-  int get hashCode => _JenkinsSmiHash.hash2(left.hashCode, right.hashCode);
-}
-
-class AsExpression extends Expression implements HasIdentifier {
-  final Expression left;
-  final Identifier right;
-
-  AsExpression(this.left, this.right);
-
-  accept(Visitor v) => v.visitAsExpression(this);
-
-  String get identifier => right.value;
-
-  Expression get expr => left;
-
-  String toString() => '($left as $right)';
-
-  bool operator ==(o) => o is AsExpression && o.left == left
-      && o.right == right;
-
-  int get hashCode => _JenkinsSmiHash.hash2(left.hashCode, right.hashCode);
-}
-
-class Index extends Expression {
-  final Expression receiver;
-  final Expression argument;
-
-  Index(this.receiver, this.argument);
-
-  accept(Visitor v) => v.visitIndex(this);
-
-  String toString() => '$receiver[$argument]';
-
-  bool operator ==(o) =>
-      o is Index
-      && o.receiver == receiver
-      && o.argument == argument;
-
-  int get hashCode =>
-      _JenkinsSmiHash.hash2(receiver.hashCode, argument.hashCode);
-}
-
-class Getter extends Expression {
-  final Expression receiver;
-  final String name;
-
-  Getter(this.receiver, this.name);
-
-  accept(Visitor v) => v.visitGetter(this);
-
-  String toString() => '$receiver.$name';
-
-  bool operator ==(o) =>
-      o is Getter
-      && o.receiver == receiver
-      && o.name == name;
-
-  int get hashCode => _JenkinsSmiHash.hash2(receiver.hashCode, name.hashCode);
-
-}
-
-/**
- * Represents a function or method invocation. If [method] is null, then
- * [receiver] is an expression that should evaluate to a function. If [method]
- * is not null, then [receiver] is an expression that should evaluate to an
- * object that has an appropriate method.
- */
-class Invoke extends Expression {
-  final Expression receiver;
-  final String method;
-  final List<Expression> arguments;
-
-  Invoke(this.receiver, this.method, this.arguments) {
-    assert(arguments != null);
-  }
-
-  accept(Visitor v) => v.visitInvoke(this);
-
-  String toString() => '$receiver.$method($arguments)';
-
-  bool operator ==(o) =>
-      o is Invoke
-      && o.receiver == receiver
-      && o.method == method
-      && _listEquals(o.arguments, arguments);
-
-  int get hashCode => _JenkinsSmiHash.hash3(receiver.hashCode, method.hashCode,
-      _hashList(arguments));
-}
-
-bool _listEquals(List a, List b) {
-  if (a == b) return true;
-  if (a == null || b == null) return false;
-  if (a.length != b.length) return false;
-  for (int i = 0; i < a.length; i++) {
-    if (a[i] != b[i]) return false;
-  }
-  return true;
-}
-
-int _hashList(List l) {
-  var hash = l.fold(0,
-      (h, item) => _JenkinsSmiHash.combine(h, item.hashCode));
-  return _JenkinsSmiHash.finish(hash);
-}
-
-class _JenkinsSmiHash {
-  // TODO: Bug 11617- This class should be optimized and standardized elsewhere.
-
-  static int combine(int hash, int value) {
-    hash = 0x1fffffff & (hash + value);
-    hash = 0x1fffffff & (hash + ((0x0007ffff & hash) << 10));
-    return hash ^ (hash >> 6);
-  }
-
-  static int finish(int hash) {
-    hash = 0x1fffffff & (hash + ((0x03ffffff & hash) <<  3));
-    hash = hash ^ (hash >> 11);
-    return 0x1fffffff & (hash + ((0x00003fff & hash) << 15));
-  }
-
-  static int hash2(int a, int b) => finish(combine(combine(0, a), b));
-
-  static int hash3(int a, int b, int c) =>
-      finish(combine(combine(combine(0, a), b), c));
-
-  static int hash4(int a, int b, int c, int d) =>
-      finish(combine(combine(combine(combine(0, a), b), c), d));
-}