use of org.drools.drl.ast.dsl.PatternContainerDescrBuilder in project drools by kiegroup.
the class DRL6Parser method lhsAccumulate.
/**
* lhsAccumulate := (ACCUMULATE|ACC) LEFT_PAREN lhsAnd (COMMA|SEMICOLON)
* accumulateFunctionBinding (COMMA accumulateFunctionBinding)*
* (SEMICOLON constraints)?
* RIGHT_PAREN SEMICOLON?
*
* @param ce
* @return
* @throws org.antlr.runtime.RecognitionException
*/
private BaseDescr lhsAccumulate(PatternContainerDescrBuilder<?, ?> ce) throws RecognitionException {
PatternDescrBuilder<?> pattern = null;
BaseDescr result = null;
pattern = helper.start((DescrBuilder<?, ?>) ce, PatternDescrBuilder.class, null);
if (pattern != null) {
result = pattern.getDescr();
}
try {
if (state.backtracking == 0) {
pattern.type("Object");
pattern.isQuery(false);
// might have to add the implicit bindings as well
}
AccumulateDescrBuilder<?> accumulate = helper.start(pattern, AccumulateDescrBuilder.class, null);
try {
if (helper.validateIdentifierKey(DroolsSoftKeywords.ACCUMULATE)) {
match(input, DRL6Lexer.ID, DroolsSoftKeywords.ACCUMULATE, null, DroolsEditorType.KEYWORD);
} else {
// might be using the short mnemonic
match(input, DRL6Lexer.ID, DroolsSoftKeywords.ACC, null, DroolsEditorType.KEYWORD);
}
if (state.failed)
return null;
if (state.backtracking == 0 && input.LA(1) != DRL6Lexer.EOF) {
helper.emit(Location.LOCATION_LHS_FROM_ACCUMULATE);
}
match(input, DRL6Lexer.LEFT_PAREN, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
CEDescrBuilder<?, AndDescr> source = accumulate.source();
try {
helper.start(source, CEDescrBuilder.class, null);
lhsAnd(source, true);
if (state.failed)
return null;
if (source.getDescr() != null && source.getDescr() instanceof ConditionalElementDescr) {
ConditionalElementDescr root = (ConditionalElementDescr) source.getDescr();
BaseDescr[] descrs = root.getDescrs().toArray(new BaseDescr[root.getDescrs().size()]);
root.getDescrs().clear();
for (int i = 0; i < descrs.length; i++) {
root.addOrMerge(descrs[i]);
}
}
} finally {
helper.end(CEDescrBuilder.class, source);
}
if (input.LA(1) == DRL6Lexer.COMMA) {
match(input, DRL6Lexer.COMMA, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
} else if (input.LA(-1) != DRL6Lexer.SEMICOLON) {
// lhsUnary will consume an optional SEMICOLON, so we need to check if it was consumed already
// or if we must fail consuming it now
match(input, DRL6Lexer.SEMICOLON, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
}
// accumulate functions
accumulateFunctionBinding(accumulate);
if (state.failed)
return null;
while (input.LA(1) == DRL6Lexer.COMMA) {
match(input, DRL6Lexer.COMMA, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
accumulateFunctionBinding(accumulate);
if (state.failed)
return null;
}
if (input.LA(1) == DRL6Lexer.SEMICOLON) {
match(input, DRL6Lexer.SEMICOLON, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
constraints(pattern);
}
match(input, DRL6Lexer.RIGHT_PAREN, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
} finally {
helper.end(AccumulateDescrBuilder.class, accumulate);
if (state.backtracking == 0 && input.LA(1) != DRL6Lexer.EOF) {
helper.emit(Location.LOCATION_LHS_BEGIN_OF_CONDITION);
}
}
} finally {
helper.end(PatternDescrBuilder.class, pattern);
}
if (input.LA(1) == DRL6Lexer.SEMICOLON) {
match(input, DRL6Lexer.SEMICOLON, null, null, DroolsEditorType.SYMBOL);
if (state.failed)
return null;
}
return result;
}
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