| 1 | COMPILER GPDefSyntaxAnalyzer
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| 2 |
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| 3 | CHARACTER SETS
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| 4 | letter = 'A'..'Z' + 'a'..'z'.
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| 5 | digit = '0'..'9'.
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| 6 | whiteSpace = CHR(9) + EOL IGNORE. /* ' ' ignored by default */
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| 7 |
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| 8 | COMMENTS
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| 9 | FROM '/*' TO '*/' NESTED.
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| 10 |
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| 11 | KEYWORDS
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| 12 | 'PROBLEM'. 'END'. 'EPS'.
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| 13 | 'LOCAL'. 'NONTERMINALS'. 'RULES'.
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| 14 | 'SEM'. 'MAXIMIZE'. 'MINIMIZE'. 'TERMINALS'. 'CONSTRAINTS'. 'INIT'. 'CODE'.
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| 15 | 'IN'. 'SET'. 'RANGE'.
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| 16 |
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| 17 | TOKENS
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| 18 | '='. '|'. '.'. '('. ')'. '['. ']'. '{'. '}'. '>>'. '..'.
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| 19 |
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| 20 | TOKEN CLASSES
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| 21 | ident = letter {letter | digit}.
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| 22 |
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| 23 | PRAGMAS
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| 24 | source = '<<' SEM <<for (; ; ) {
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| 25 | switch (GPDefSyntaxAnalyzerLex.curCh) {
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| 26 | case Utils.EF:
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| 27 | Errors.SemError(GPDefSyntaxAnalyzerLex.curLine, GPDefSyntaxAnalyzerLex.curCol, "end of file in source text");
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| 28 | return;
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| 29 | case '<':
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| 30 | GPDefSyntaxAnalyzerLex.NextCh();
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| 31 | if (GPDefSyntaxAnalyzerLex.curCh == '<') {
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| 32 | Errors.Warning(GPDefSyntaxAnalyzerLex.curLine, GPDefSyntaxAnalyzerLex.curCol, "non closed source text before?");
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| 33 | GPDefSyntaxAnalyzerLex.NextCh();
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| 34 | }
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| 35 | break;
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| 36 | case '>':
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| 37 | GPDefSyntaxAnalyzerLex.NextCh();
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| 38 | if (GPDefSyntaxAnalyzerLex.curCh == '>') {
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| 39 | GPDefSyntaxAnalyzerLex.curCh = ' '; // force GPDefSyntaxAnalyzerLex to get next character
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| 40 | return;
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| 41 | }
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| 42 | break;
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| 43 | default:
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| 44 | GPDefSyntaxAnalyzerLex.NextCh();
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| 45 | break;
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| 46 | }
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| 47 | }>>
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| 48 | .
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| 49 | NONTERMINALS
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| 50 | GPDefSyntaxAnalyzer.
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| 51 | SemDecl. SemAction. NonterminalDecl.
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| 52 | RuleDef. SynExpr. SynTerm. SynFact. TerminalDecl.
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| 53 | ConstraintDef. ConstraintRule. SetDefinition.
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| 54 |
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| 55 | RULES
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| 56 | GPDefSyntaxAnalyzer =
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| 57 | 'PROBLEM' ident
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| 58 | ['CODE' /* SourceText */]
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| 59 | ['INIT' /* SourceText */]
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| 60 | 'NONTERMINALS' { NonterminalDecl }
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| 61 | 'TERMINALS' { TerminalDecl }
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| 62 | 'RULES' { RuleDef }
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| 63 | ('MAXIMIZE' | 'MINIMIZE') /* SourceText */
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| 64 | 'END' ident '.'.
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| 65 |
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| 66 |
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| 67 | SemDecl = 'LOCAL' /* SourceText */
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| 68 | .
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| 69 |
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| 70 | SemAction = 'SEM' /* SourceText */
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| 71 | .
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| 72 |
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| 73 | NonterminalDecl = ident /* FormalAttrList */ '.'
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| 74 |
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| 75 |
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| 76 |
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| 77 | .
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| 78 |
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| 79 | TerminalDecl = ident /* FormalAttrList */
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| 80 | [ 'CONSTRAINTS' ConstraintDef ]
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| 81 | '.'
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| 82 | .
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| 83 |
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| 84 | ConstraintDef = { ConstraintRule }.
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| 85 | ConstraintRule = ident 'IN' SetDefinition .
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| 86 | SetDefinition =
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| 87 | 'SET' /* SourceText */
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| 88 | | 'RANGE' /* SourceText */ '..' /* SourceText */
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| 89 | .
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| 90 |
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| 91 | RuleDef = ident /* FormalAttrList */ '=' [SemDecl] SynExpr '.'
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| 92 | .
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| 93 |
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| 94 | SynExpr = SynTerm {'|' SynTerm}
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| 95 | .
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| 96 |
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| 97 | SynTerm = SynFact {SynFact}
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| 98 | .
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| 99 |
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| 100 | SynFact =
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| 101 | ident /* ActualAttrList */
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| 102 | | 'EPS'
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| 103 | | '(' SynExpr ')'
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| 104 | | '[' SynExpr ']'
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| 105 | | '{' SynExpr '}'
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| 106 | | SemAction
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| 107 | .
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| 108 |
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| 109 | END GPDefSyntaxAnalyzer. |
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