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POANTLR3 common values in 2 different domain values
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  1. POANTLR3 common values in 2 different domain values
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    copied!<p>I need to define a language-parser for the following search criteria:</p> <pre><code>CRITERIA_1=&lt;values-set-#1&gt; AND/OR CRITERIA_2=&lt;values-set-#2&gt;; </code></pre> <p>Where <code>&lt;values-set-#1&gt;</code> can have values from 1-50 and <code>&lt;values-set-#2&gt;</code> can be from the following set (5, A, B, C) - case is not important here.</p> <p>I have decided to use ANTLR3 (v3.4) with output in C# (CSharp3) and it used to work pretty smooth until now. The problem is that it fails to parse the string when I provide values from both data-sets (I.e. in this case '5'). For example, if I provide the following string</p> <pre><code>CRITERIA_1=5; </code></pre> <p>It returns the following error where the value node was supposed to be:</p> <pre><code>&lt;unexpected: [@1,11:11='5',&lt;27&gt;,1:11], resync=5&gt; </code></pre> <p>The grammar definition file is the following:</p> <pre><code>grammar ZeGrammar; options { language=CSharp3; TokenLabelType=CommonToken; output=AST; ASTLabelType=CommonTree; k=3; } tokens { ROOT; CRITERIA_1; CRITERIA_2; OR = 'OR'; AND = 'AND'; EOF = ';'; LPAREN = '('; RPAREN = ')'; } public start : expr EOF -&gt; ^(ROOT expr) ; expr : subexpr ((AND|OR)^ subexpr)* ; subexpr : grouppedsubexpr | 'CRITERIA_1=' rangeval1_expr -&gt; ^(CRITERIA_1 rangeval1_expr) | 'CRITERIA_2=' rangeval2_expr -&gt; ^(CRITERIA_2 rangeval2_expr) ; grouppedsubexpr : LPAREN! expr RPAREN! ; rangeval1_expr : rangeval1_subexpr | RANGE1_VALUES ; rangeval1_subexpr : LPAREN! rangeval1_expr (OR^ rangeval1_expr)* RPAREN! ; RANGE1_VALUES : (('0'..'4')? ('0'..'9') | '5''0') ; rangeval2_expr : rangeval2_subexpr | RANGE2_VALUES ; rangeval2_subexpr : LPAREN! rangeval2_expr (OR^ rangeval2_expr)* RPAREN! ; RANGE2_VALUES : '5' | ('a'|'A') | ('b'|'B') | ('c'|'C') ; </code></pre> <p>And if I remove the value '5' from <code>RANGE2_VALUES</code> it works fine. Can anyone hint me on what I am doing wrong?</p>
 

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