Last change
on this file since 1 was
1,
checked in by lnalod, 15 years ago
|
Initial import of YAO sources
|
File size:
2.1 KB
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Rev | Line | |
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[1] | 1 | // This file is part of PyANTLR. See LICENSE.txt for license |
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| 2 | // details..........Copyright (C) Wolfgang Haefelinger, 2004. |
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| 3 | // |
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| 4 | // $Id$ |
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| 5 | |
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| 6 | options { |
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| 7 | language=Python; |
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| 8 | } |
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| 9 | |
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| 10 | class treewalk_p extends Parser; |
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| 11 | |
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| 12 | options { |
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| 13 | codeGenMakeSwitchThreshold = 3; |
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| 14 | codeGenBitsetTestThreshold = 4; |
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| 15 | buildAST=true; |
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| 16 | } |
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| 17 | |
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| 18 | block |
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| 19 | : LCURLY^ ( statement )* RCURLY! |
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| 20 | ; |
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| 21 | |
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| 22 | statement |
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| 23 | : expr SEMI! |
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| 24 | | "if"^ LPAREN! expr RPAREN! statement |
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| 25 | ( "else"! statement )? |
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| 26 | | "while"^ LPAREN! expr RPAREN! statement |
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| 27 | |! b:block { statement_AST = b_AST; } |
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| 28 | // do some manual tree returning |
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| 29 | ; |
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| 30 | |
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| 31 | expr: assignExpr |
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| 32 | ; |
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| 33 | |
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| 34 | assignExpr |
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| 35 | : aexpr (ASSIGN^ assignExpr)? |
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| 36 | ; |
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| 37 | |
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| 38 | aexpr |
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| 39 | : mexpr (PLUS^ mexpr)* |
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| 40 | ; |
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| 41 | |
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| 42 | mexpr |
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| 43 | : atom (STAR^ atom)* |
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| 44 | ; |
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| 45 | |
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| 46 | atom: ID |
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| 47 | | INT |
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| 48 | ; |
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| 49 | |
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| 50 | class treewalk_w extends TreeParser; |
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| 51 | |
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| 52 | block |
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| 53 | : #( LCURLY ( stat )+ ) |
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| 54 | ; |
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| 55 | |
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| 56 | stat: #("if" expr stat (stat)?) |
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| 57 | | #("while" expr stat) |
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| 58 | | expr |
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| 59 | | block |
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| 60 | ; |
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| 61 | |
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| 62 | expr: #(ASSIGN expr expr) {print "found assign" } |
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| 63 | | #(PLUS expr expr) {print "found +" } |
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| 64 | | #(STAR expr expr) {print "found *" } |
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| 65 | | a:ID {print "found ID " ,a.getText() } |
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| 66 | | b:INT {print "found INT ",b.getText() } |
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| 67 | ; |
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| 68 | |
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| 69 | class treewalk_l extends Lexer; |
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| 70 | |
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| 71 | WS : (' ' |
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| 72 | | '\t' |
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| 73 | | '\n' |
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| 74 | | '\r') |
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| 75 | { _ttype = SKIP; } |
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| 76 | ; |
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| 77 | |
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| 78 | LPAREN: '(' |
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| 79 | ; |
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| 80 | |
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| 81 | RPAREN: ')' |
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| 82 | ; |
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| 83 | |
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| 84 | LCURLY: '{' |
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| 85 | ; |
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| 86 | |
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| 87 | RCURLY: '}' |
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| 88 | ; |
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| 89 | |
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| 90 | STAR: '*' |
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| 91 | ; |
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| 92 | |
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| 93 | PLUS: '+' |
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| 94 | ; |
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| 95 | |
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| 96 | ASSIGN |
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| 97 | : '=' |
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| 98 | ; |
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| 99 | |
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| 100 | SEMI: ';' |
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| 101 | ; |
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| 102 | |
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| 103 | COMMA |
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| 104 | : ',' |
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| 105 | ; |
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| 106 | |
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| 107 | protected |
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| 108 | ESC : '\\' |
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| 109 | ( 'n' |
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| 110 | | 'r' |
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| 111 | | 't' |
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| 112 | | 'b' |
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| 113 | | 'f' |
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| 114 | | '"' |
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| 115 | | '\'' |
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| 116 | | '\\' |
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| 117 | | ('0'..'3') ( DIGIT (DIGIT)? )? |
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| 118 | | ('4'..'7') (DIGIT)? |
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| 119 | ) |
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| 120 | ; |
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| 121 | |
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| 122 | protected |
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| 123 | DIGIT |
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| 124 | : '0'..'9' |
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| 125 | ; |
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| 126 | |
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| 127 | INT : (DIGIT)+ |
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| 128 | ; |
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| 129 | |
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| 130 | ID : ('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')* |
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| 131 | { |
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| 132 | try: |
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| 133 | i = literals[self.getText()] |
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| 134 | _ttype = i; |
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| 135 | except: |
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| 136 | pass |
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| 137 | } |
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| 138 | ; |
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