Examples with INodeStack buildcraft.lib.expression.api.INodeStack used on opensource projects

Example 1 with INodeStack

use of buildcraft.lib.expression.api.INodeStack in project BuildCraft by BuildCraft.

the class NodeCasting method castToObject.

public static <T> INodeFuncObject<T> castToObject(INodeFunc func, Class<T> to) throws InvalidExpressionException {
    Class<?> from = NodeTypes.getType(func);
    if (from == to) {
        return (INodeFuncObject<T>) func;
    }
    FunctionContext castingContext = new FunctionContext(NodeTypes.getContext(from), NodeTypes.getContext(to));
    INodeFunc caster = castingContext.getFunction("(" + NodeTypes.getName(to) + ")", Collections.singletonList(from));
    if (caster == null) {
        if (to == String.class) {
            return (INodeFuncObject<T>) castToString(func);
        }
        throw new InvalidExpressionException("Cannot cast from " + NodeTypes.getName(from) + " to " + NodeTypes.getName(to));
    }
    return new INodeFuncObject<T>() {

        @Override
        public INodeObject<T> getNode(INodeStack stack) throws InvalidExpressionException {
            return (INodeObject<T>) caster.getNode(new NodeStack(func.getNode(stack)));
        }

        @Override
        public Class<T> getType() {
            return to;
        }
    };
}

Example 2 with INodeStack

use of buildcraft.lib.expression.api.INodeStack in project BuildCraft by BuildCraft.

the class InternalCompiler method pushFunctionNode.

private static void pushFunctionNode(NodeStack stack, String function, FunctionContext context) throws InvalidExpressionException {
    String name = function.substring(0, function.indexOf(FUNCTION_ARGS));
    String argCount = function.substring(function.indexOf(FUNCTION_ARGS) + 1);
    int count = Integer.parseInt(argCount);
    if (name.startsWith(".")) {
        /*
             * Allow object style function calling by making the called node be the first argument to the function,
             * pushing all other nodes back
             */
        name = name.substring(1);
        count++;
    }
    List<IExpressionNode> popOrder = stack.peek(count);
    List<Class<?>> functionOrder = new ArrayList<>(popOrder.size());
    Map<List<Class<?>>, INodeFunc> functions = new HashMap<>();
    if (name.contains(".")) {
        int index = name.indexOf('.');
        String type = name.substring(0, index);
        FunctionContext ctx = getContext(type);
        if (ctx != null) {
            functions.putAll(ctx.getFunctions(name.substring(index + 1)));
        }
    }
    FunctionContext[] ctxs = new FunctionContext[count + 1];
    ctxs[0] = context;
    int n = 1;
    for (IExpressionNode node : popOrder) {
        Class<?> nodeType = NodeTypes.getType(node);
        functionOrder.add(0, nodeType);
        ctxs[n++] = NodeTypes.getContext(nodeType);
    }
    functions.putAll(new FunctionContext(ctxs).getFunctions(name));
    INodeFunc bestFunction = null;
    int bestCastCount = Integer.MAX_VALUE;
    List<INodeFunc> bestCasters = null;
    List<Class<?>> bestClassesTo = null;
    List<String> fnOrderNames = functionOrder.stream().map(NodeTypes::getName).collect(Collectors.toList());
    ExpressionDebugManager.debugStart("Finding best function called '" + name + "' for " + fnOrderNames);
    for (Map.Entry<List<Class<?>>, INodeFunc> func : functions.entrySet()) {
        List<Class<?>> functionClasses = func.getKey();
        List<String> fnClassNames = functionClasses.stream().map(NodeTypes::getName).collect(Collectors.toList());
        ExpressionDebugManager.debugPrintln("Found " + fnClassNames);
        if (functionClasses.size() != functionOrder.size()) {
            continue;
        }
        int casts = 0;
        boolean canCast = true;
        List<INodeFunc> casters = new ArrayList<>();
        ExpressionDebugManager.debugStart("Finding casters...");
        for (int i = 0; i < functionClasses.size(); i++) {
            Class<?> from = functionOrder.get(i);
            Class<?> to = functionClasses.get(i);
            ExpressionDebugManager.debugPrintln("  - " + NodeTypes.getName(from) + " -> " + NodeTypes.getName(to));
            if (from == to) {
                casters.add(a -> a.pop(from));
                ExpressionDebugManager.debugPrintln("    - Equal types, no cast needed.");
                continue;
            }
            INodeFunc caster;
            if (from == long.class && to == INodeLong.class) {
                caster = new NodeFuncWrapper() {

                    @Override
                    public IExpressionNode getNode(INodeStack s) throws InvalidExpressionException {
                        return new NodeConstantObject<>(INodeLong.class, s.popLong());
                    }
                };
            } else if (from == double.class && to == INodeDouble.class) {
                caster = new NodeFuncWrapper() {

                    @Override
                    public IExpressionNode getNode(INodeStack s) throws InvalidExpressionException {
                        return new NodeConstantObject<>(INodeDouble.class, s.popDouble());
                    }
                };
            } else if (from == long.class && to == INodeDouble.class) {
                caster = new NodeFuncWrapper() {

                    @Override
                    public IExpressionNode getNode(INodeStack s) throws InvalidExpressionException {
                        INodeLong node = s.popLong();
                        INodeDouble nodeD = new NodeCastLongToDouble(node);
                        return new NodeConstantObject<>(INodeDouble.class, nodeD.inline());
                    }
                };
            } else if (from == boolean.class && to == INodeBoolean.class) {
                caster = new NodeFuncWrapper() {

                    @Override
                    public IExpressionNode getNode(INodeStack s) throws InvalidExpressionException {
                        return new NodeConstantObject<>(INodeBoolean.class, s.popBoolean());
                    }
                };
            } else {
                FunctionContext castingCtx = new FunctionContext(NodeTypes.getContext(from), NodeTypes.getContext(to));
                caster = castingCtx.getFunction("(" + NodeTypes.getName(to) + ")", Collections.singletonList(from));
                if (caster == null) {
                    ExpressionDebugManager.debugPrintln("    - No cast found!");
                    canCast = false;
                    break;
                }
            }
            casts++;
            casters.add(caster);
            ExpressionDebugManager.debugPrintln("    - Caster = " + caster);
        }
        ExpressionDebugManager.debugEnd("");
        if (!canCast) {
            continue;
        }
        if (casts < bestCastCount) {
            bestCastCount = casts;
            bestFunction = func.getValue();
            bestCasters = casters;
            bestClassesTo = functionClasses;
        }
    }
    ExpressionDebugManager.debugEnd("Best = " + bestFunction);
    if (bestFunction == null || bestCasters == null) {
        // Allow any object to be compared to itself with == and !=
        boolean isEq = "==".equals(name);
        boolean isNE = "!=".equals(name);
        if (count == 2 && (isEq | isNE) && functionOrder.get(0) == functionOrder.get(1)) {
            Class<?> cls = functionOrder.get(0);
            NodeFuncObjectObjectToBoolean.IFuncObjectObjectToBoolean<?, ?> func = isEq ? Objects::equals : (a, b) -> !Objects.equals(a, b);
            bestFunction = new NodeFuncObjectObjectToBoolean(name, cls, cls, func);
            bestCastCount = 0;
            bestCasters = Collections.emptyList();
            bestClassesTo = new ArrayList<>(functionOrder);
            ExpressionDebugManager.debugPrintln("Using implicit object equality comparison.");
        } else {
            throw new InvalidExpressionException("No viable function called '" + name + "' found for " + fnOrderNames + getValidFunctionsErrorString(context));
        }
    }
    NodeStack realStack;
    if (bestCastCount == 0) {
        realStack = stack;
    } else {
        IExpressionNode[] nodes = new IExpressionNode[count];
        for (int i = count - 1; i >= 0; i--) {
            INodeFunc caster = bestCasters.get(i);
            Class<?> from = functionOrder.get(i);
            Class<?> to = bestClassesTo.get(i);
            stack.setRecorder(Collections.singletonList(from), caster);
            IExpressionNode node = caster.getNode(stack);
            stack.checkAndRemoveRecorder();
            Class<?> actual = NodeTypes.getType(node);
            if (actual != to) {
                throw new IllegalStateException("The caster " + caster + " didn't produce the correct result! (Expected " + to + ", but got " + actual + ")");
            }
            nodes[i] = node;
        }
        ExpressionDebugManager.debugPrintln("Nodes = " + nodes);
        realStack = new NodeStack(nodes);
    }
    INodeFunc func = bestFunction;
    bestClassesTo = new ArrayList<>(bestClassesTo);
    Collections.reverse(bestClassesTo);
    realStack.setRecorder(bestClassesTo, func);
    IExpressionNode node = func.getNode(realStack);
    realStack.checkAndRemoveRecorder();
    stack.push(node);
}