Examples with ParserContext org.mvel2.ParserContext used on opensource projects

Example 91 with ParserContext

use of org.mvel2.ParserContext in project mvel by mikebrock.

the class MVELInterpretedRuntime method parse.

public Object parse() {
    try {
        stk = new ExecutionStack();
        dStack = new ExecutionStack();
        variableFactory.setTiltFlag(false);
        cursor = start;
        return parseAndExecuteInterpreted();
    } catch (ArrayIndexOutOfBoundsException e) {
        e.printStackTrace();
        throw new CompileException("unexpected end of statement", expr, length);
    } catch (NullPointerException e) {
        e.printStackTrace();
        if (cursor >= length) {
            throw new CompileException("unexpected end of statement", expr, length);
        } else {
            throw e;
        }
    } catch (CompileException e) {
        throw ErrorUtil.rewriteIfNeeded(e, expr, cursor);
    } finally {
        if (parserContext != null)
            contextControl(REMOVE, null, null);
    }
}

Example 92 with ParserContext

use of org.mvel2.ParserContext in project stargate-core by tuplejump.

the class AggregateFunction method init.

@Override
public void init(Options options) {
    this.options = options;
    int k = 0;
    positions = new HashMap<>();
    aggregateFields = new String[aggregates.length];
    for (AggregateFactory aggregateFactory : aggregates) {
        String field = aggregateFactory.getField();
        if (field != null) {
            aggregateFields[k] = field;
            positions.put(field, k++);
        }
    }
    ParserConfiguration parserConfig = getParserConfiguration();
    if (groupBy != null) {
        this.groupByExpressions = new ExecutableStatement[groupBy.length];
        this.simpleExpressions = new boolean[groupBy.length];
        groupByFields = new ArrayList<>();
        for (int i = 0; i < groupBy.length; i++) {
            String groupByField = groupBy[i];
            String groupByCol = getGroupBy(groupByField);
            boolean isSimpleExpression = options.types.containsKey(getColumnName(groupByCol));
            ParserContext parserContext = new ParserContext(parserConfig);
            groupByExpressions[i] = (ExecutableStatement) MVEL.compileExpression(groupByField, parserContext);
            if (isSimpleExpression) {
                simpleExpressions[i] = true;
                int pos = k++;
                positions.put(groupByCol, pos);
                groupByFields.add(groupByCol);
            } else {
                simpleExpressions[i] = false;
                Set<String> keys = parserContext.getInputs().keySet();
                for (String key : keys) {
                    int pos = k++;
                    boolean canResolve = options.types.containsKey(getColumnName(key));
                    if (canResolve) {
                        String groupByColField = getGroupBy(key);
                        positions.put(key, pos);
                        groupByFields.add(groupByColField);
                    }
                }
            }
        }
    }
    group = new Group(options, aggregates, groupBy, groupByExpressions);
}

Example 93 with ParserContext

use of org.mvel2.ParserContext 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 = getMVELDialectRuntimeData(context).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);
    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());
        }
        AsmUtil.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);
    for (String input : requiredInputs) {
        if ("this".equals(input)) {
            continue;
        }
        if (WM_ARGUMENT.equals(input)) {
            parserContext2.addInput(input, InternalWorkingMemory.class);
            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();
            AsmUtil.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;
}

Example 94 with ParserContext

use of org.mvel2.ParserContext in project drools by kiegroup.

the class MVELExprAnalyzer method getExpressionType.

public static Class<?> getExpressionType(PackageBuildContext context, Map<String, Class<?>> declCls, RuleConditionElement source, String expression) {
    MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData("mvel");
    ParserConfiguration conf = data.getParserConfiguration();
    conf.setClassLoader(context.getKnowledgeBuilder().getRootClassLoader());
    ParserContext pctx = new ParserContext(conf);
    pctx.setStrongTyping(true);
    pctx.setStrictTypeEnforcement(true);
    for (Map.Entry<String, Class<?>> entry : declCls.entrySet()) {
        pctx.addInput(entry.getKey(), entry.getValue());
    }
    for (Declaration decl : source.getOuterDeclarations().values()) {
        pctx.addInput(decl.getBindingName(), decl.getDeclarationClass());
    }
    try {
        return MVEL.analyze(expression, pctx);
    } catch (Exception e) {
        log.warn("Unable to parse expression: " + expression, e);
    }
    return null;
}

Example 95 with ParserContext

use of org.mvel2.ParserContext in project drools by kiegroup.

the class MVELBeanCreator method createBean.

@Override
public <T> T createBean(ClassLoader cl, String type, QualifierModel qualifier) throws Exception {
    if (qualifier != null) {
        throw new IllegalArgumentException("Cannot use a qualifier without a CDI container");
    }
    ParserConfiguration config = new ParserConfiguration();
    config.setClassLoader(cl);
    ParserContext ctx = new ParserContext(config);
    if (parameters != null) {
        for (Map.Entry<String, Object> entry : parameters.entrySet()) {
            ctx.addVariable(entry.getKey(), entry.getValue().getClass());
        }
    }
    Object compiledExpression = MVEL.compileExpression(type, ctx);
    return (T) CoreComponentsBuilder.get().getMVELExecutor().executeExpression(compiledExpression, parameters);
}