Examples of com.sk89q.worldedit.internal.expression.Expression

Package com.sk89q.worldedit.internal.expression

Examples of com.sk89q.worldedit.internal.expression.Expression

com.sk89q.worldedit.internal.expression.Expression
Compiles and evaluates expressions.
Supported operators:
- Logical: &&, ||, ! (unary)
- Bitwise: ~ (unary), >>, <<
- Arithmetic: +, -, *, /, % (modulo), ^ (power), - (unary), --, ++ (prefix only)
- Comparison: <=, >=, >, <, ==, !=, ~= (near)
Supported functions: abs, acos, asin, atan, atan2, cbrt, ceil, cos, cosh, exp, floor, ln, log, log10, max, max, min, min, rint, round, sin, sinh, sqrt, tan, tanh and more. (See the Functions class or the wiki)

Constants: e, pi

To compile an equation, run {@code Expression.compile("expression here", "var1", "var2"...)}. If you wish to run the equation multiple times, you can then optimize it, by calling {@link #optimize()}. You can then run the equation as many times as you want by calling {@link #evaluate(double)}. You do not need to pass values for all variables specified while compiling. To query variables after evaluation, you can use {@link #getVariable(String,boolean)}. To get a value out of these, use {@link Variable#getValue()}.

Variables are also supported and can be set either by passing values to {@link #evaluate(double)}.


        return distribution;
    }


    public int makeShape(final Region region, final Vector zero, final Vector unit, final Pattern pattern, final String expressionString, final boolean hollow) throws ExpressionException, MaxChangedBlocksException {
        final Expression expression = Expression.compile(expressionString, "x", "y", "z", "type", "data");
        expression.optimize();


        final RValue typeVariable = expression.getVariable("type", false);
        final RValue dataVariable = expression.getVariable("data", false);


        final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(this, unit, zero);
        expression.setEnvironment(environment);


        final ArbitraryShape shape = new ArbitraryShape(region) {
            @Override
            protected BaseBlock getMaterial(int x, int y, int z, BaseBlock defaultMaterial) {
                final Vector current = new Vector(x, y, z);
                environment.setCurrentBlock(current);
                final Vector scaled = current.subtract(zero).divide(unit);


                try {
                    if (expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ(), defaultMaterial.getType(), defaultMaterial.getData()) <= 0) {
                        return null;
                    }


                    return new BaseBlock((int) typeVariable.getValue(), (int) dataVariable.getValue());
                } catch (Exception e) {

View Full Code Here


        return shape.generate(this, pattern, hollow);
    }


    public int deformRegion(final Region region, final Vector zero, final Vector unit, final String expressionString) throws ExpressionException, MaxChangedBlocksException {
        final Expression expression = Expression.compile(expressionString, "x", "y", "z");
        expression.optimize();


        final RValue x = expression.getVariable("x", false);
        final RValue y = expression.getVariable("y", false);
        final RValue z = expression.getVariable("z", false);


        final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(this, unit, zero);
        expression.setEnvironment(environment);


        final DoubleArrayList<BlockVector, BaseBlock> queue = new DoubleArrayList<BlockVector, BaseBlock>(false);


        for (BlockVector position : region) {
            // offset, scale
            final Vector scaled = position.subtract(zero).divide(unit);


            // transform
            expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ());


            final BlockVector sourcePosition = environment.toWorld(x.getValue(), y.getValue(), z.getValue());


            // read block from world
            // TODO: use getBlock here once the reflection is out of the way

View Full Code Here


    public int makeBiomeShape(final Region region, final Vector zero, final Vector unit, final BaseBiome biomeType, final String expressionString, final boolean hollow) throws ExpressionException, MaxChangedBlocksException {
        final Vector2D zero2D = zero.toVector2D();
        final Vector2D unit2D = unit.toVector2D();


        final Expression expression = Expression.compile(expressionString, "x", "z");
        expression.optimize();


        final EditSession editSession = this;
        final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(editSession, unit, zero);
        expression.setEnvironment(environment);


        final ArbitraryBiomeShape shape = new ArbitraryBiomeShape(region) {
            @Override
            protected BaseBiome getBiome(int x, int z, BaseBiome defaultBiomeType) {
                final Vector2D current = new Vector2D(x, z);
                environment.setCurrentBlock(current.toVector(0));
                final Vector2D scaled = current.subtract(zero2D).divide(unit2D);


                try {
                    if (expression.evaluate(scaled.getX(), scaled.getZ()) <= 0) {
                        return null;
                    }


                    // TODO: Allow biome setting via a script variable (needs BiomeType<->int mapping)
                    return defaultBiomeType;

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        try {
            return Double.parseDouble(input);
        } catch (NumberFormatException e1) {
            try {
                Expression expression = Expression.compile(input);
                return expression.evaluate();
            } catch (EvaluationException e) {
                throw new ParameterException(String.format(
                        "Expected '%s' to be a valid number (or a valid mathematical expression)", input));
            } catch (ExpressionException e) {
                throw new ParameterException(String.format(

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        usage = "<expression>",
        desc = "Evaluate a mathematical expression"
    )
    public void calc(Actor actor, @Text String input) throws CommandException {
        try {
            Expression expression = Expression.compile(input);
            actor.print("= " + expression.evaluate());
        } catch (EvaluationException e) {
            actor.printError(String.format(
                    "'%s' could not be parsed as a valid expression", input));
        } catch (ExpressionException e) {
            actor.printError(String.format(

View Full Code Here

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Related Classes of com.sk89q.worldedit.internal.expression.Expression

com.sk89q.worldedit.command.UtilityCommands

com.sk89q.worldedit.EditSession

com.sk89q.worldedit.internal.expression.runtime.Constant

com.sk89q.worldedit.internal.expression.runtime.RValue

com.sk89q.worldedit.internal.expression.runtime.Variable

com.sk89q.worldedit.util.command.binding.PrimitiveBindings

com.sk89q.worldedit.internal.expression.runtime.EvaluationException

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