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package bsh;
import java.lang.reflect.Array;
/**
* The name of this class is somewhat misleading. This covers both the case
* where there is an array initializer and
*/
class BSHArrayDimensions extends SimpleNode {
public Class baseType;
public int numDefinedDims;
public int numUndefinedDims;
/**
* The Length in each defined dimension. This value set by the eval()
* Since the values can come from Expressions we should be re-eval()d
* each time.
*/
public int[] definedDimensions;
BSHArrayDimensions(int id) {
super(id);
}
public void addDefinedDimension() {
numDefinedDims++;
}
public void addUndefinedDimension() {
numUndefinedDims++;
}
public Object eval(Class type, CallStack callstack, Interpreter interpreter) throws EvalError {
if (Interpreter.DEBUG)
Interpreter.debug("array base type = " + type);
baseType = type;
return eval(callstack, interpreter);
}
/**
* Evaluate the structure of the array in one of two ways:
*
* a) an initializer exists, evaluate it and return the fully
* constructed array object, also record the dimensions of that array
*
* b) evaluate and record the lengths in each dimension and return void.
*
* The structure of the array dims is maintained in dimensions.
*/
public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
SimpleNode child = (SimpleNode) jjtGetChild(0);
/*
* Child is array initializer. Evaluate it and fill in the
* dimensions it returns. Initialized arrays are always fully
* defined (no undefined dimensions to worry about). The syntax
* uses the undefinedDimension count. e.g. int [][] { 1, 2 };
*/
if (child instanceof BSHArrayInitializer) {
if (baseType == null)
throw new EvalError("Internal Array Eval err: unknown base type", this, callstack);
Object initValue = ((BSHArrayInitializer) child).eval(baseType, numUndefinedDims, callstack, interpreter);
Class arrayClass = initValue.getClass();
int actualDimensions = Reflect.getArrayDimensions(arrayClass);
definedDimensions = new int[actualDimensions];
// Compare with number of dimensions actually created
// with the
// number specified (syntax uses the undefined ones
// here)
if (definedDimensions.length != numUndefinedDims)
throw new EvalError("Incompatible initializer. Allocation calls for a " + numUndefinedDims + " dimensional array, but initializer is a " + actualDimensions + " dimensional array", this, callstack);
// fill in definedDimensions [] lengths
Object arraySlice = initValue;
for (int i = 0; i < definedDimensions.length; i++) {
definedDimensions[i] = Array.getLength(arraySlice);
if (definedDimensions[i] > 0)
arraySlice = Array.get(arraySlice, 0);
}
return initValue;
} else
// Evaluate the defined dimensions of the array
{
definedDimensions = new int[numDefinedDims];
for (int i = 0; i < numDefinedDims; i++) {
try {
Object length = ((SimpleNode) jjtGetChild(i)).eval(callstack, interpreter);
definedDimensions[i] = ((Primitive) length).intValue();
} catch (Exception e) {
throw new EvalError("Array index: " + i + " does not evaluate to an integer", this, callstack);
}
}
}
return Primitive.VOID;
}
}
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