use of org.mvel2.ast.Instance in project drools by kiegroup.
the class MVELExprAnalyzer method analyzeExpression.
// ------------------------------------------------------------
// Instance methods
// ------------------------------------------------------------
/**
* Analyze an expression.
*
* @param expr
* The expression to analyze.
* @param availableIdentifiers
* Total set of declarations available.
*
* @return The <code>Set</code> of declarations used by the expression.
* @throws RecognitionException
* If an error occurs in the parser.
*/
@SuppressWarnings("unchecked")
public static MVELAnalysisResult analyzeExpression(final PackageBuildContext context, final String expr, final BoundIdentifiers availableIdentifiers, final Map<String, Class<?>> localTypes, String contextIdentifier, Class kcontextClass) {
if (expr.trim().length() <= 0) {
MVELAnalysisResult result = analyze((Set<String>) Collections.EMPTY_SET, availableIdentifiers);
result.setMvelVariables(new HashMap<String, Class<?>>());
result.setTypesafe(true);
return result;
}
MVEL.COMPILER_OPT_ALLOW_NAKED_METH_CALL = true;
MVEL.COMPILER_OPT_ALLOW_OVERRIDE_ALL_PROPHANDLING = true;
MVEL.COMPILER_OPT_ALLOW_RESOLVE_INNERCLASSES_WITH_DOTNOTATION = true;
MVEL.COMPILER_OPT_SUPPORT_JAVA_STYLE_CLASS_LITERALS = true;
MVELDialect dialect = (MVELDialect) context.getDialect("mvel");
ParserConfiguration conf = context.getMVELDialectRuntimeData().getParserConfiguration();
conf.setClassLoader(context.getKnowledgeBuilder().getRootClassLoader());
// first compilation is for verification only
// @todo proper source file name
final ParserContext parserContext1 = new ParserContext(conf);
if (localTypes != null) {
for (Entry entry : localTypes.entrySet()) {
parserContext1.addInput((String) entry.getKey(), (Class) entry.getValue());
}
}
if (availableIdentifiers.getThisClass() != null) {
parserContext1.addInput("this", availableIdentifiers.getThisClass());
}
if (availableIdentifiers.getOperators() != null) {
for (Entry<String, EvaluatorWrapper> opEntry : availableIdentifiers.getOperators().entrySet()) {
parserContext1.addInput(opEntry.getKey(), opEntry.getValue().getClass());
}
}
parserContext1.setStrictTypeEnforcement(false);
parserContext1.setStrongTyping(false);
parserContext1.setInterceptors(dialect.getInterceptors());
Class<?> returnType;
try {
returnType = MVEL.analyze(expr, parserContext1);
} catch (Exception e) {
BaseDescr base = (context instanceof RuleBuildContext) ? ((RuleBuildContext) context).getRuleDescr() : context.getParentDescr();
if (e instanceof CompileException && e.getCause() != null && e.getMessage().startsWith("[Error: null]")) {
// rewrite error message in cause original message is null
e = new CompileException(e.getCause().toString(), ((CompileException) e).getExpr(), ((CompileException) e).getCursor(), e.getCause());
}
DialectUtil.copyErrorLocation(e, context.getParentDescr());
context.addError(new DescrBuildError(base, context.getParentDescr(), null, "Unable to Analyse Expression " + expr + ":\n" + e.getMessage()));
return null;
}
Set<String> requiredInputs = new HashSet<String>();
requiredInputs.addAll(parserContext1.getInputs().keySet());
HashMap<String, Class<?>> variables = (HashMap<String, Class<?>>) ((Map) parserContext1.getVariables());
if (localTypes != null) {
for (String str : localTypes.keySet()) {
// we have to do this due to mvel regressions on detecting true local vars
variables.remove(str);
}
}
// MVEL includes direct fields of context object in non-strict mode. so we need to strip those
if (availableIdentifiers.getThisClass() != null) {
requiredInputs.removeIf(s -> PropertyTools.getFieldOrAccessor(availableIdentifiers.getThisClass(), s) != null);
}
// now, set the required input types and compile again
final ParserContext parserContext2 = new ParserContext(conf);
parserContext2.setStrictTypeEnforcement(true);
parserContext2.setStrongTyping(true);
parserContext2.setInterceptors(dialect.getInterceptors());
for (String input : requiredInputs) {
if ("this".equals(input)) {
continue;
}
Class<?> cls = availableIdentifiers.resolveType(input);
if (cls == null) {
if (input.equals(contextIdentifier) || input.equals("kcontext")) {
cls = kcontextClass;
} else if (input.equals("rule")) {
cls = Rule.class;
} else if (localTypes != null) {
cls = localTypes.get(input);
}
}
if (cls != null) {
parserContext2.addInput(input, cls);
}
}
if (availableIdentifiers.getThisClass() != null) {
parserContext2.addInput("this", availableIdentifiers.getThisClass());
}
boolean typesafe = context.isTypesafe();
try {
returnType = MVEL.analyze(expr, parserContext2);
typesafe = true;
} catch (Exception e) {
// is this an error, or can we fall back to non-typesafe mode?
if (typesafe) {
BaseDescr base = (context instanceof RuleBuildContext) ? ((RuleBuildContext) context).getRuleDescr() : context.getParentDescr();
DialectUtil.copyErrorLocation(e, context.getParentDescr());
context.addError(new DescrBuildError(base, context.getParentDescr(), null, "Unable to Analyse Expression " + expr + ":\n" + e.getMessage()));
return null;
}
}
if (typesafe) {
requiredInputs = new HashSet<String>();
requiredInputs.addAll(parserContext2.getInputs().keySet());
requiredInputs.addAll(variables.keySet());
variables = (HashMap<String, Class<?>>) ((Map) parserContext2.getVariables());
if (localTypes != null) {
for (String str : localTypes.keySet()) {
// we have to do this due to mvel regressions on detecting true local vars
variables.remove(str);
}
}
}
MVELAnalysisResult result = analyze(requiredInputs, availableIdentifiers);
result.setReturnType(returnType);
result.setMvelVariables(variables);
result.setTypesafe(typesafe);
return result;
}
use of org.mvel2.ast.Instance in project drools by kiegroup.
the class ConditionAnalyzer method analyzeSingleCondition.
private SingleCondition analyzeSingleCondition(ASTNode node, boolean isNegated) {
SingleCondition condition = new SingleCondition(isNegated);
if (node instanceof BinaryOperation) {
BinaryOperation binaryOperation = (BinaryOperation) node;
condition.left = analyzeNode(binaryOperation.getLeft());
condition.operation = BooleanOperator.fromMvelOpCode(binaryOperation.getOperation());
condition.right = analyzeNode(binaryOperation.getRight());
} else if (node instanceof RegExMatch) {
condition.left = analyzeNode(node);
condition.operation = BooleanOperator.MATCHES;
RegExMatch regExNode = (RegExMatch) node;
Pattern pattern = regExNode.getPattern();
if (pattern != null) {
condition.right = new FixedExpression(String.class, pattern.pattern());
} else {
condition.right = analyzeNode(((ExecutableAccessor) regExNode.getPatternStatement()).getNode());
}
} else if (node instanceof Contains) {
condition.left = analyzeNode(((Contains) node).getFirstStatement());
condition.operation = BooleanOperator.CONTAINS;
condition.right = analyzeNode(((Contains) node).getSecondStatement());
} else if (node instanceof Soundslike) {
condition.left = analyzeNode(((Soundslike) node).getStatement());
condition.operation = BooleanOperator.SOUNDSLIKE;
condition.right = analyzeNode(((Soundslike) node).getSoundslike());
} else if (node instanceof Instance) {
condition.left = analyzeNode(((Instance) node).getStatement());
condition.operation = BooleanOperator.INSTANCEOF;
condition.right = analyzeNode(((Instance) node).getClassStatement());
} else {
condition.left = analyzeNode(node);
}
return condition;
}
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