compiler/java/com/google/dart/compiler/backend/js/JsRequiresSemiVisitor.java - Issue 9479013: Remove backends.

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Issue 9479013: Remove backends. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart

Patch Set: More clean up Created 8 years, 9 months ago

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« compiler/java/com/google/dart/compiler/CommandLineOptions.java ('K') | « compiler/java/com/google/dart/compiler/backend/js/JsPrettyNamer.java ('k') | compiler/java/com/google/dart/compiler/backend/js/JsReservedIdentifiers.java » ('j') | compiler/java/com/google/dart/compiler/type/TypeAnalyzer.java » ('J')
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file

2 // for details. All rights reserved. Use of this source code is governed by a

3 // BSD-style license that can be found in the LICENSE file.

4

5 package com.google.dart.compiler.backend.js;

6

7 import com.google.dart.compiler.backend.js.ast.JsBlock;

8 import com.google.dart.compiler.backend.js.ast.JsBreak;

9 import com.google.dart.compiler.backend.js.ast.JsContext;

10 import com.google.dart.compiler.backend.js.ast.JsDebugger;

11 import com.google.dart.compiler.backend.js.ast.JsDoWhile;

12 import com.google.dart.compiler.backend.js.ast.JsEmpty;

13 import com.google.dart.compiler.backend.js.ast.JsExprStmt;

14 import com.google.dart.compiler.backend.js.ast.JsFor;

15 import com.google.dart.compiler.backend.js.ast.JsForIn;

16 import com.google.dart.compiler.backend.js.ast.JsIf;

17 import com.google.dart.compiler.backend.js.ast.JsLabel;

18 import com.google.dart.compiler.backend.js.ast.JsReturn;

19 import com.google.dart.compiler.backend.js.ast.JsStatement;

20 import com.google.dart.compiler.backend.js.ast.JsSwitch;

21 import com.google.dart.compiler.backend.js.ast.JsThrow;

22 import com.google.dart.compiler.backend.js.ast.JsTry;

23 import com.google.dart.compiler.backend.js.ast.JsVars;

24 import com.google.dart.compiler.backend.js.ast.JsVisitor;

25 import com.google.dart.compiler.backend.js.ast.JsWhile;

26

27 /**

28 * Determines if a statement at the end of a block requires a semicolon.

29 *

30 * For example, the following statements require semicolons:<br>

31 * <ul>

32 * <li>if (cond);</li>

33 * <li>while (cond);</li>

34 * </ul>

35 *

36 * The following do not require semicolons:<br>

37 * <ul>

38 * <li>return 1</li>

39 * <li>do {} while(true)</li>

40 * </ul>

41 */

42 public class JsRequiresSemiVisitor extends JsVisitor {

43

44 public static boolean exec(JsStatement lastStatement) {

45 JsRequiresSemiVisitor visitor = new JsRequiresSemiVisitor();

46 visitor.accept(lastStatement);

47 return visitor.needsSemicolon;

48 }

49

50 private boolean needsSemicolon = false;

51

52 private JsRequiresSemiVisitor() {

53 }

54

55 @Override

56 public boolean visit(JsBlock x, JsContext ctx) {

57 return false;

58 }

59

60 @Override

61 public boolean visit(JsBreak x, JsContext ctx) {

62 return false;

63 }

64

65 @Override

66 public boolean visit(JsDebugger x, JsContext ctx) {

67 return false;

68 }

69

70 @Override

71 public boolean visit(JsDoWhile x, JsContext ctx) {

72 return false;

73 }

74

75 @Override

76 public boolean visit(JsEmpty x, JsContext ctx) {

77 return false;

78 }

79

80 @Override

81 public boolean visit(JsExprStmt x, JsContext ctx) {

82 return false;

83 }

84

85 @Override

86 public boolean visit(JsFor x, JsContext ctx) {

87 if (x.getBody() instanceof JsEmpty) {

88 needsSemicolon = true;

89 }

90 return false;

91 }

92

93 @Override

94 public boolean visit(JsForIn x, JsContext ctx) {

95 if (x.getBody() instanceof JsEmpty) {

96 needsSemicolon = true;

97 }

98 return false;

99 }

100

101 @Override

102 public boolean visit(JsIf x, JsContext ctx) {

103 JsStatement thenStmt = x.getThenStmt();

104 JsStatement elseStmt = x.getElseStmt();

105 JsStatement toCheck = thenStmt;

106 if (elseStmt != null) {

107 toCheck = elseStmt;

108 }

109 if (toCheck instanceof JsEmpty) {

110 needsSemicolon = true;

111 } else {

112 // Must recurse to determine last statement (possible if-else chain).

113 accept(toCheck);

114 }

115 return false;

116 }

117

118 @Override

119 public boolean visit(JsLabel x, JsContext ctx) {

120 if (x.getStmt() instanceof JsEmpty) {

121 needsSemicolon = true;

122 }

123 return false;

124 }

125

126 @Override

127 public boolean visit(JsReturn x, JsContext ctx) {

128 return false;

129 }

130

131 @Override

132 public boolean visit(JsSwitch x, JsContext ctx) {

133 return false;

134 }

135

136 @Override

137 public boolean visit(JsThrow x, JsContext ctx) {

138 return false;

139 }

140

141 @Override

142 public boolean visit(JsTry x, JsContext ctx) {

143 return false;

144 }

145

146 @Override

147 public boolean visit(JsVars x, JsContext ctx) {

148 return false;

149 }

150

151 @Override

152 public boolean visit(JsWhile x, JsContext ctx) {

153 if (x.getBody() instanceof JsEmpty) {

154 needsSemicolon = true;

155 }

156 return false;

157 }

158 }

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