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|
%{
#include <BALL/KERNEL/expressionParser.h>
#include <BALL/KERNEL/expressionTree.h>
using namespace BALL;
using namespace std;
extern int ExpressionParserlex();
extern void ExpressionParsererror(char const* s)
throw(Exception::ParseError);
%}
%union {
char* text;
ExpressionParser::SyntaxTree* node;
}
%left <text> TK_OR
%left <text> TK_AND
%left <text> TK_NOT
%left <text> TK_WHITESPACE;
%left <text> TK_SOMETHING
%token <text> TK_PREDICATE_NAME
%token <text> TK_OPEN_BRACKET
%token <text> TK_CLOSE_BRACKET
%type <node> kernel_expression
%type <node> expression
%type <node> predicate
%type <text> balanced_brackets
%type <text> outer_brackets
%type <text> inside_brackets
%type <text> something
%start kernel_expression
%%
kernel_expression: expression
{
ExpressionParser::state.tree = $1;
}
;
expression:
predicate {
$$ = $1;
}
| TK_WHITESPACE expression {
$$ = $2;
}
| expression TK_WHITESPACE {
$$ = $1;
}
| TK_NOT expression {
$$ = $2;
$2->negate = !$2->negate;
}
| TK_OPEN_BRACKET expression TK_CLOSE_BRACKET {
$$ = $2;
}
| expression TK_AND expression {
$$ = new ExpressionParser::SyntaxTree($1, $3, ExpressionTree::AND);
}
| expression TK_OR expression {
$$ = new ExpressionParser::SyntaxTree($1, $3, ExpressionTree::OR);
}
;
predicate:
TK_PREDICATE_NAME outer_brackets {
*$2 = '\0';
$$ = new ExpressionParser::SyntaxTree($1, $2 + 1);
}
;
outer_brackets:
balanced_brackets {
$$ = $1;
*($1 + strlen($1) - 1) = '\0';
}
;
balanced_brackets:
TK_OPEN_BRACKET inside_brackets TK_CLOSE_BRACKET {
$$ = $1;
}
;
inside_brackets:
something balanced_brackets inside_brackets {
$$ = $1;
}
| something {
$$ = $1;
}
;
something:
{
$$ = 0;
}
| TK_SOMETHING something {
$$ = $1;
}
| TK_WHITESPACE something {
$$ = $1;
}
| TK_PREDICATE_NAME something {
$$ = $1;
}
| TK_AND something {
$$ = $1;
}
| TK_OR something {
$$ = $1;
}
| TK_NOT something {
$$ = $1;
}
;
%%
void ExpressionParsererror(char const* s)
throw(Exception::ParseError)
{
throw Exception::ParseError(__FILE__, 0,
ExpressionParser::state.buffer,
String(s) + String(" (at position ")
+ String(ExpressionParser::state.char_count) + String(")"));
}
|
