Added query{,Abs,Rel}(x,y,z,typevar,datavar) to the expression parser.

src/main/java/com/sk89q/worldedit/EditSession.java

@@ -2808,10 +2808,15 @@ public class EditSession {
         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 scaled = new Vector(x, y, z).subtract(zero).divide(unit);
+                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) {
@@ -2837,7 +2842,8 @@ public class EditSession {
         final RValue y = expression.getVariable("y", false);
         final RValue z = expression.getVariable("z", false);
 
-        Vector zero2 = zero.add(0.5, 0.5, 0.5);
+        final WorldEditExpressionEnvironment environment = new WorldEditExpressionEnvironment(this, unit, zero);
+        expression.setEnvironment(environment);
 
         final DoubleArrayList<BlockVector, BaseBlock> queue = new DoubleArrayList<BlockVector, BaseBlock>(false);
 
@@ -2848,13 +2854,11 @@ public class EditSession {
             // transform
             expression.evaluate(scaled.getX(), scaled.getY(), scaled.getZ());
 
-            final Vector sourceScaled = new Vector(x.getValue(), y.getValue(), z.getValue());
-
-            // unscale, unoffset, round-nearest
-            final BlockVector sourcePosition = sourceScaled.multiply(unit).add(zero2).toBlockPoint();
+            final BlockVector sourcePosition = environment.toWorld(scaled.getX(), scaled.getY(), scaled.getZ());
 
             // read block from world
-            BaseBlock material = new BaseBlock(world.getBlockType(sourcePosition), world.getBlockData(sourcePosition));
+            // TODO: use getBlock here once the reflection is out of the way
+            final BaseBlock material = new BaseBlock(world.getBlockType(sourcePosition), world.getBlockData(sourcePosition));
 
             // queue operation
             queue.put(position, material);

src/main/java/com/sk89q/worldedit/WorldEditExpressionEnvironment.java

@@ -0,0 +1,59 @@
+package com.sk89q.worldedit;
+
+import com.sk89q.worldedit.expression.runtime.ExpressionEnvironment;
+
+class WorldEditExpressionEnvironment implements ExpressionEnvironment {
+    private final Vector unit;
+    private final Vector zero2;
+    private Vector current = new Vector();
+    private EditSession editSession;
+
+    public WorldEditExpressionEnvironment(EditSession editSession, Vector unit, Vector zero) {
+        this.editSession = editSession;
+        this.unit = unit;
+        this.zero2 = zero.add(0.5, 0.5, 0.5);
+    }
+
+    public BlockVector toWorld(double x, double y, double z) {
+        // unscale, unoffset, round-nearest
+        return new Vector(x, y, z).multiply(unit).add(zero2).toBlockPoint();
+    }
+
+    public Vector toWorldRel(double x, double y, double z) {
+        return current.add(x, y, z);
+    }
+
+    @Override
+    public int getBlockType(double x, double y, double z) {
+        return editSession.getBlockType(toWorld(x, y, z));
+    }
+
+    @Override
+    public int getBlockData(double x, double y, double z) {
+        return editSession.getBlockData(toWorld(x, y, z));
+    }
+
+    @Override
+    public int getBlockTypeAbs(double x, double y, double z) {
+        return editSession.getBlockType(new Vector(x, y, z));
+    }
+
+    @Override
+    public int getBlockDataAbs(double x, double y, double z) {
+        return editSession.getBlockData(new Vector(x, y, z));
+    }
+
+    @Override
+    public int getBlockTypeRel(double x, double y, double z) {
+        return editSession.getBlockType(toWorldRel(x, y, z));
+    }
+
+    @Override
+    public int getBlockDataRel(double x, double y, double z) {
+        return editSession.getBlockData(toWorldRel(x, y, z));
+    }
+
+    public void setCurrentBlock(Vector current) {
+        this.current = current;
+    }
+}

src/main/java/com/sk89q/worldedit/expression/Expression.java

@@ -24,9 +24,12 @@ import java.util.List;
 import java.util.Map;
 import java.util.Stack;
 
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.Vector;
 import com.sk89q.worldedit.expression.lexer.Lexer;
 import com.sk89q.worldedit.expression.lexer.tokens.Token;
 import com.sk89q.worldedit.expression.parser.Parser;
+import com.sk89q.worldedit.expression.runtime.ExpressionEnvironment;
 import com.sk89q.worldedit.expression.runtime.Constant;
 import com.sk89q.worldedit.expression.runtime.EvaluationException;
 import com.sk89q.worldedit.expression.runtime.Functions;
@@ -43,7 +46,7 @@ import com.sk89q.worldedit.expression.runtime.Variable;
  * 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
+ * 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
  *
@@ -65,6 +68,7 @@ public class Expression {
     private final String[] variableNames;
     private RValue root;
     private final Functions functions = new Functions();
+    private ExpressionEnvironment environment;
 
     public static Expression compile(String expression, String... variableNames) throws ExpressionException {
         return new Expression(expression, variableNames);
@@ -157,4 +161,12 @@ public class Expression {
     public Functions getFunctions() {
         return functions;
     }
+
+    public ExpressionEnvironment getEnvironment() {
+        return environment;
+    }
+
+    public void setEnvironment(ExpressionEnvironment environment) {
+        this.environment = environment;
+    }
 }

src/main/java/com/sk89q/worldedit/expression/runtime/ExpressionEnvironment.java

@@ -0,0 +1,16 @@
+package com.sk89q.worldedit.expression.runtime;
+
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.Vector;
+
+/**
+ * Represents a way to access blocks in a world. Has to accept non-rounded coordinates.
+ */
+public interface ExpressionEnvironment {
+    int getBlockType(double x, double y, double z);
+    int getBlockData(double x, double y, double z);
+    int getBlockTypeAbs(double x, double y, double z);
+    int getBlockDataAbs(double x, double y, double z);
+    int getBlockTypeRel(double x, double y, double z);
+    int getBlockDataRel(double x, double y, double z);
+}

src/main/java/com/sk89q/worldedit/expression/runtime/Functions.java

@@ -375,4 +375,60 @@ public final class Functions {
     public static double randint(RValue max) throws EvaluationException {
         return random.nextInt((int) Math.floor(max.getValue()));
     }
+
+
+    private static double queryInternal(LValue type, LValue data, double typeId, double dataValue) throws EvaluationException {
+        // Compare to input values and determine return value
+        final double ret = typeId == type.getValue() && typeId == type.getValue() ? 1.0 : 0.0;
+
+        type.assign(typeId);
+        data.assign(dataValue);
+
+        return ret;
+    }
+
+    @Dynamic
+    public static double query(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
+        final double xp = x.getValue();
+        final double yp = y.getValue();
+        final double zp = z.getValue();
+
+        final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
+
+        // Read values from world
+        final double typeId = environment.getBlockType(xp, yp, zp);
+        final double dataValue = environment.getBlockData(xp, yp, zp);
+
+        return queryInternal(type, data, typeId, dataValue);
+    }
+
+    @Dynamic
+    public static double queryAbs(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
+        final double xp = x.getValue();
+        final double yp = y.getValue();
+        final double zp = z.getValue();
+
+        final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
+
+        // Read values from world
+        final double typeId = environment.getBlockTypeAbs(xp, yp, zp);
+        final double dataValue = environment.getBlockDataAbs(xp, yp, zp);
+
+        return queryInternal(type, data, typeId, dataValue);
+    }
+
+    @Dynamic
+    public static double queryRel(RValue x, RValue y, RValue z, LValue type, LValue data) throws EvaluationException {
+        final double xp = x.getValue();
+        final double yp = y.getValue();
+        final double zp = z.getValue();
+
+        final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
+
+        // Read values from world
+        final double typeId = environment.getBlockTypeRel(xp, yp, zp);
+        final double dataValue = environment.getBlockDataRel(xp, yp, zp);
+
+        return queryInternal(type, data, typeId, dataValue);
+    }
 }