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我最近將我的SQL解析器代碼從paraboiled移動到ANTLR,並且它非常平滑的遷移,但是當我的SQL包含AND或OR條件運算符時,我收到了此錯誤消息。我分享樣本語法,將不勝感激任何幫助。不承認令牌
如果我嘗試解析這個樣本SQL "SELECT Name,Age,Salary FROM Employee WHERE Age=12 AND Dept=15"
我得到的線不匹配1:50輸入「與」期待{,OPAND,OPOR}
但是,如果我下面的規則,然後它的作品取代,我試圖執行不區分大小寫的解析
binaryConditionalExp:binaryExp | binaryConditionalExp CONDOPERATOR =('AND'|'OR')binaryConditionalExp | binaryparenExp;
/**
* Define a grammar called Hello
*/
grammar SQLParser;
@header
{
package somu.parsers;
}
prog : sqlsyntax; // match keyword hello followed by an identifier
sqlsyntax : (selectclause fromclause whereclause) | (selectclause fromclause) ;
selectclause : 'SELECT' columnclause;
columnclause : columnName (',' columnName)*;
columnName : columnLiteral;
columnLiteral : ID | sqlsyntax;
fromclause : 'FROM' tableclause;
tableclause : (tableclausealiaswithas | tableclauseplainalias | tableclausenoalias);
tableclausenoalias : ID | ;
tableclausealiaswithas : ID 'as' ID;
tableclauseplainalias : ID ID;
whereclause : 'WHERE' binarystmt;
binarystmt : binaryConditionalExp;
binaryExp: columnName OPERATOR columnName;
binaryparenExp: '(' binaryConditionalExp ')';
binaryConditionalExp: binaryExp |
binaryConditionalExp CONDOPERATOR=(OPAND | OPOR) binaryConditionalExp |
binaryparenExp;
ID : [a-zA-Z0-9]+ ; // match identifiers
WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
OPERATOR: [=><]+ ;
OPAND : A N D ;
OPOR : O R;
fragment DIGIT : [0-9];
fragment A : [aA];
fragment B : [bB];
fragment C : [cC];
fragment D : [dD];
fragment E : [eE];
fragment F : [fF];
fragment G : [gG];
fragment H : [hH];
fragment I : [iI];
fragment J : [jJ];
fragment K : [kK];
fragment L : [lL];
fragment M : [mM];
fragment N : [nN];
fragment O : [oO];
fragment P : [pP];
fragment Q : [qQ];
fragment R : [rR];
fragment S : [sS];
fragment T : [tT];
fragment U : [uU];
fragment V : [vV];
fragment W : [wW];
fragment X : [xX];
fragment Y : [yY];
fragment Z : [zZ];