Examples with ArrayType kalang.core.ArrayType used on opensource projects

Example 6 with ArrayType

use of kalang.core.ArrayType in project kalang by kasonyang.

the class AstBuilder method visitForEachStat.

@Override
public Object visitForEachStat(KalangParser.ForEachStatContext ctx) {
    BlockStmt block = newBlock();
    ExprNode expr = this.visitExpression(ctx.expression());
    Type exprType = expr.getType();
    List<TerminalNode> idsCtx = ctx.Identifier();
    VarExpr indexVarExpr = null;
    TerminalNode varId;
    if (idsCtx.size() == 1) {
        varId = idsCtx.get(0);
    } else {
        TerminalNode indexId = idsCtx.get(0);
        LocalVarNode indexVar = this.declareLocalVar(indexId.getText(), Types.INT_TYPE, Modifier.FINAL, ctx);
        if (indexVar == null)
            return null;
        block.statements.add(new VarDeclStmt(indexVar));
        indexVarExpr = new VarExpr(indexVar);
        varId = idsCtx.get(1);
    }
    LoopStmt loopStmt;
    if (exprType instanceof ArrayType) {
        LocalVarNode localVarNode = this.declareLocalVar(varId.getText(), ((ArrayType) exprType).getComponentType(), Modifier.FINAL, ctx);
        if (localVarNode == null)
            return null;
        VarExpr localVariable = new VarExpr(localVarNode);
        block.statements.add(new VarDeclStmt(localVarNode));
        LocalVarNode lenVar = this.declareTempLocalVar(Types.INT_TYPE);
        LocalVarNode counterVar = this.declareTempLocalVar(Types.INT_TYPE);
        // var len
        block.statements.add(new VarDeclStmt(lenVar));
        // var i
        block.statements.add(new VarDeclStmt(counterVar));
        VarExpr counterVarExpr = new VarExpr(counterVar);
        VarExpr lenVarExpr = new VarExpr(lenVar);
        block.statements.add(new ExprStmt(new AssignExpr(lenVarExpr, new ArrayLengthExpr(expr))));
        // l = array.length
        block.statements.add(new ExprStmt(new AssignExpr(counterVarExpr, new ConstExpr(0))));
        // i=0
        ExprNode cnd = new CompareExpr(counterVarExpr, lenVarExpr, CompareExpr.OP_LT);
        BlockStmt loopBody = this.newBlock();
        loopBody.statements.add(new ExprStmt(new AssignExpr(localVariable, new ElementExpr(expr, counterVarExpr))));
        if (indexVarExpr != null) {
            loopBody.statements.add(new ExprStmt(new AssignExpr(indexVarExpr, counterVarExpr)));
        }
        loopBody.statements.add(visitStat(ctx.stat()));
        popBlock();
        BlockStmt updateBs = newBlock();
        // increment counter
        updateBs.statements.add(new ExprStmt(new AssignExpr(counterVarExpr, new MathExpr(counterVarExpr, new ConstExpr(1), MathExpr.OP_ADD))));
        popBlock();
        loopStmt = new LoopStmt(cnd, null, loopBody, updateBs);
    } else {
        ObjectType iterType = Types.getIterableClassType();
        if (iterType.isAssignableFrom(exprType)) {
            ObjectInvokeExpr getIterableExpr;
            try {
                getIterableExpr = ObjectInvokeExpr.create(expr, "iterator", null);
            } catch (MethodNotFoundException | AmbiguousMethodException ex) {
                throw Exceptions.unexceptedException(ex);
            }
            LocalVarNode iterableVarNode = this.declareTempLocalVar(getIterableExpr.getType());
            block.statements.add(new VarDeclStmt(iterableVarNode));
            VarExpr iterableVarExpr = new VarExpr(iterableVarNode);
            block.statements.add(new ExprStmt(new AssignExpr(iterableVarExpr, getIterableExpr)));
            // set index = 0
            if (indexVarExpr != null) {
                block.statements.add(new ExprStmt(new AssignExpr(indexVarExpr, new ConstExpr(0))));
            }
            ObjectInvokeExpr cnd;
            try {
                cnd = ObjectInvokeExpr.create(iterableVarExpr, "hasNext", null);
            } catch (MethodNotFoundException | AmbiguousMethodException ex) {
                throw Exceptions.unexceptedException(ex);
            }
            BlockStmt loopBody = this.newBlock();
            ObjectInvokeExpr nextInvokeExpr;
            try {
                nextInvokeExpr = ObjectInvokeExpr.create(iterableVarExpr, "next", null);
            } catch (MethodNotFoundException | AmbiguousMethodException ex) {
                throw Exceptions.unexceptedException(ex);
            }
            LocalVarNode localVarNode = this.declareLocalVar(varId.getText(), nextInvokeExpr.getType(), Modifier.FINAL, ctx);
            if (localVarNode == null)
                return null;
            VarExpr localVariable = new VarExpr(localVarNode);
            loopBody.statements.add(new VarDeclStmt(localVarNode));
            loopBody.statements.add(new ExprStmt(new AssignExpr(localVariable, new CastExpr(localVariable.getType(), nextInvokeExpr))));
            loopBody.statements.add(visitStat(ctx.stat()));
            popBlock();
            BlockStmt updateBs = newBlock();
            if (indexVarExpr != null) {
                // do index++
                updateBs.statements.add(new ExprStmt(new AssignExpr(indexVarExpr, new MathExpr(indexVarExpr, new ConstExpr(1), BinaryExpr.OP_ADD))));
            }
            popBlock();
            loopStmt = new LoopStmt(cnd, null, loopBody, updateBs);
        } else {
            this.handleSyntaxError("require array type or iterable type", ctx.expression());
            loopStmt = null;
        }
    }
    popBlock();
    if (loopStmt != null)
        block.statements.add(loopStmt);
    return block;
}