Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl.function.programming;

import java.util.Objects;

import org.apache.commons.lang3.Range;

import org.gvsig.expressionevaluator.Code;

import org.gvsig.expressionevaluator.Codes;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.expressionevaluator.Function;

import org.gvsig.expressionevaluator.Interpreter;

import org.gvsig.expressionevaluator.PrettyFormatter;

import org.gvsig.expressionevaluator.impl.DefaultInterpreter;

import org.gvsig.expressionevaluator.impl.HostExpressionUtils;

import org.gvsig.expressionevaluator.impl.function.programming.BreakFunction.BreakException;

import org.gvsig.expressionevaluator.impl.function.programming.ReturnFunction.ReturnException;

import org.gvsig.expressionevaluator.spi.AbstractFunction;

@SuppressWarnings("UseSpecificCatch")

public class CodeBlockFunction extends AbstractFunction {

    public static final String NAME = "BLOCK";

    public CodeBlockFunction() {

        super(Function.GROUP_PROGRAMMING,

                NAME,

                Range.between(1, Integer.MAX_VALUE),

                "Evaluate each of the arguments sequentially.",

                "BEGIN\n  {{sentence}};\nEXCEPT\n  PASS\nEND\n",

                null,

                "Object",

                false

        );

    }

    @Override

    public boolean isHidden() {

        return true;

    }

    @Override

    public boolean useArgumentsInsteadObjects() {

        return true;

    }

    @Override

    public boolean allowConstantFolding() {

        return false;

    }

    @Override

    public Object call(Interpreter interpreter, Object[] args) throws Exception {

        throw new UnsupportedOperationException("Not supported yet.");

    }

    @Override

    public Object call(Interpreter interpreter, Codes args) throws Exception {

        Object value = null;

        int argn = 0;

        for (Code statement : args) {

            // LLamamos a runCode para que no atrape los returns.

            try {

                statement = HostExpressionUtils.resolveHostExpressions(statement, interpreter);

                value = ((DefaultInterpreter) interpreter).runCode(statement);

            } catch(BreakException|ReturnException ex) {

                throw ex;

            } catch(Exception ex) {

                String stmt = "unknown";

                try {

                    stmt = Objects.toString(statement);

                } catch(Exception ex2) {

                }

                LOGGER.warn("Error in block function calling arg "+ argn + ", "+ stmt, ex);

                throw ex;

            }

            argn++;

        }

        return value;

    }

    @Override

    public String toString(Codes args, Formatter<Code> formatter) {

        PrettyFormatter builder = PrettyFormatter.get(formatter);

        try {

            builder.push();

            builder.append("BEGIN ");

            builder.indent();

            for (Code statement : args) {

                builder.nl();

                builder.append(statement.toString(formatter));

                builder.append("; ");

            }

            builder.unindent();

            builder.nl();

            builder.append("END ");

            return builder.build();

        } finally {

            builder.pop();

        }

    }

}