Mercurial > projects > dang
annotate sema/Visitor.d @ 5:2c5a8f4c254a
Added very simple if support.
* No else
* Still no logical operators, always tests != 0
| author | Anders Halager <halager@gmail.com> |
|---|---|
| date | Fri, 18 Apr 2008 11:46:00 +0200 |
| parents | 2168f4cb73f1 |
| children | 642c6a998fd9 |
| rev | line source |
|---|---|
| 1 | 1 module sema.Visitor; |
| 2 | |
| 3 import tango.io.Stdout; | |
| 4 | |
| 5 public | |
| 6 import ast.Decl, | |
| 7 ast.Stmt, | |
| 8 ast.Exp; | |
| 9 | |
| 10 import lexer.Token; | |
| 11 | |
| 12 class Visitor(FinalT = int, DeclT = FinalT, StmtT = DeclT, ExpT = StmtT) | |
| 13 { | |
| 14 public: | |
| 15 FinalT visit(Decl[] decls) | |
| 16 { | |
| 17 foreach (decl; decls) | |
| 18 visitDecl(decl); | |
| 19 static if (is(FinalT == void)) | |
| 20 return; | |
| 21 else | |
| 22 return FinalT.init; | |
| 23 } | |
| 24 | |
| 25 DeclT visitDecl(Decl decl) | |
| 26 { | |
| 27 switch(decl.declType) | |
| 28 { | |
| 29 case DeclType.FuncDecl: | |
| 30 return visitFuncDecl(cast(FuncDecl)decl); | |
| 31 case DeclType.VarDecl: | |
| 32 return visitVarDecl(cast(VarDecl)decl); | |
| 33 default: | |
| 34 throw new Exception("Unknown declaration type"); | |
| 35 } | |
| 36 } | |
| 37 | |
| 38 StmtT visitStmt(Stmt stmt) | |
| 39 { | |
| 40 switch(stmt.stmtType) | |
| 41 { | |
| 42 case StmtType.Return: | |
| 43 return visitReturnStmt(cast(ReturnStmt)stmt); | |
| 44 case StmtType.Decl: | |
| 45 return visitDeclStmt(cast(DeclStmt)stmt); | |
| 46 case StmtType.Exp: | |
| 47 return visitExpStmt(cast(ExpStmt)stmt); | |
|
5
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
48 case StmtType.If: |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
49 return visitIfStmt(cast(IfStmt)stmt); |
| 1 | 50 default: |
| 51 throw new Exception("Unknown statement type"); | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 ExpT visitExp(Exp exp) | |
| 56 { | |
| 57 switch(exp.expType) | |
| 58 { | |
| 59 case ExpType.Binary: | |
| 60 return visitBinaryExp(cast(BinaryExp)exp); | |
| 61 case ExpType.IntegerLit: | |
| 62 return visitIntegerLit(cast(IntegerLit)exp); | |
| 63 case ExpType.Negate: | |
| 64 return visitNegateExp(cast(NegateExp)exp); | |
| 65 case ExpType.AssignExp: | |
| 66 return visitAssignExp(cast(AssignExp)exp); | |
| 67 case ExpType.CallExp: | |
| 68 return visitCallExp(cast(CallExp)exp); | |
| 69 case ExpType.Identifier: | |
| 70 return visitIdentifier(cast(Identifier)exp); | |
| 71 default: | |
| 72 throw new Exception("Unknown expression type"); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 // Declarations: | |
| 77 DeclT visitVarDecl(VarDecl d) | |
| 78 { | |
| 79 visitExp(d.type); | |
| 80 visitExp(d.identifier); | |
| 81 if (d.init) | |
| 82 visitExp(d.init); | |
| 83 | |
| 84 static if (is(DeclT == void)) | |
| 85 return; | |
| 86 else | |
| 87 return DeclT.init; | |
| 88 } | |
| 89 | |
| 90 DeclT visitFuncDecl(FuncDecl f) | |
| 91 { | |
| 92 visitExp(f.type); | |
| 93 visitExp(f.identifier); | |
| 94 foreach (arg; f.funcArgs) | |
| 95 visitDecl(arg); | |
| 96 foreach (stmt; f.statements) | |
| 97 visitStmt(stmt); | |
| 98 | |
| 99 static if (is(DeclT == void)) | |
| 100 return; | |
| 101 else | |
| 102 return DeclT.init; | |
| 103 } | |
| 104 | |
| 105 // Statements: | |
| 106 StmtT visitReturnStmt(ReturnStmt s) | |
| 107 { | |
| 108 visitExp(s.exp); | |
| 109 static if (is(StmtT == void)) | |
| 110 return; | |
| 111 else | |
| 112 return StmtT.init; | |
| 113 } | |
| 114 | |
| 115 StmtT visitDeclStmt(DeclStmt d) | |
| 116 { | |
| 117 visitDecl(d.decl); | |
| 118 static if (is(StmtT == void)) | |
| 119 return; | |
| 120 else | |
| 121 return StmtT.init; | |
| 122 } | |
| 123 | |
|
5
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
124 StmtT visitIfStmt(IfStmt s) |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
125 { |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
126 visitExp(s.cond); |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
127 foreach (stmt; s.then) |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
128 visitStmt(stmt); |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
129 static if (is(StmtT == void)) |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
130 return; |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
131 else |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
132 return StmtT.init; |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
133 } |
|
2c5a8f4c254a
Added very simple if support.
Anders Halager <halager@gmail.com>
parents:
1
diff
changeset
|
134 |
| 1 | 135 StmtT visitExpStmt(ExpStmt s) |
| 136 { | |
| 137 visitExp(s.exp); | |
| 138 static if (is(StmtT == void)) | |
| 139 return; | |
| 140 else | |
| 141 return StmtT.init; | |
| 142 } | |
| 143 | |
| 144 // Expressions: | |
| 145 ExpT visitAssignExp(AssignExp exp) | |
| 146 { | |
| 147 visitExp(exp.identifier); | |
| 148 visitExp(exp.exp); | |
| 149 static if (is(ExpT == void)) | |
| 150 return; | |
| 151 else | |
| 152 return ExpT.init; | |
| 153 } | |
| 154 | |
| 155 ExpT visitBinaryExp(BinaryExp exp) | |
| 156 { | |
| 157 visitExp(exp.left); | |
| 158 visitExp(exp.right); | |
| 159 static if (is(ExpT == void)) | |
| 160 return; | |
| 161 else | |
| 162 return ExpT.init; | |
| 163 } | |
| 164 | |
| 165 ExpT visitCallExp(CallExp exp) | |
| 166 { | |
| 167 visitExp(exp.exp); | |
| 168 foreach (arg; exp.args) | |
| 169 visitExp(arg); | |
| 170 static if (is(ExpT == void)) | |
| 171 return; | |
| 172 else | |
| 173 return ExpT.init; | |
| 174 } | |
| 175 | |
| 176 ExpT visitNegateExp(NegateExp exp) | |
| 177 { | |
| 178 visitExp(exp.exp); | |
| 179 static if (is(ExpT == void)) | |
| 180 return; | |
| 181 else | |
| 182 return ExpT.init; | |
| 183 } | |
| 184 | |
| 185 ExpT visitIntegerLit(IntegerLit exp) | |
| 186 { | |
| 187 static if (is(ExpT == void)) | |
| 188 return; | |
| 189 else | |
| 190 return ExpT.init; | |
| 191 } | |
| 192 | |
| 193 ExpT visitIdentifier(Identifier exp) | |
| 194 { | |
| 195 static if (is(ExpT == void)) | |
| 196 return; | |
| 197 else | |
| 198 return ExpT.init; | |
| 199 } | |
| 200 } | |
| 201 |