/jEdit/tags/jedit-4-2-pre4/bsh/BSHArrayDimensions.java
Java | 148 lines | 68 code | 16 blank | 64 comment | 10 complexity | 94e77b4a05ed88735ff3ece0cbb7818d MD5 | raw file
Possible License(s): BSD-3-Clause, AGPL-1.0, Apache-2.0, LGPL-2.0, LGPL-3.0, GPL-2.0, CC-BY-SA-3.0, LGPL-2.1, GPL-3.0, MPL-2.0-no-copyleft-exception, IPL-1.0
- /*****************************************************************************
- * *
- * This file is part of the BeanShell Java Scripting distribution. *
- * Documentation and updates may be found at http://www.beanshell.org/ *
- * *
- * Sun Public License Notice: *
- * *
- * The contents of this file are subject to the Sun Public License Version *
- * 1.0 (the "License"); you may not use this file except in compliance with *
- * the License. A copy of the License is available at http://www.sun.com *
- * *
- * The Original Code is BeanShell. The Initial Developer of the Original *
- * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
- * (C) 2000. All Rights Reserved. *
- * *
- * GNU Public License Notice: *
- * *
- * Alternatively, the contents of this file may be used under the terms of *
- * the GNU Lesser General Public License (the "LGPL"), in which case the *
- * provisions of LGPL are applicable instead of those above. If you wish to *
- * allow use of your version of this file only under the terms of the LGPL *
- * and not to allow others to use your version of this file under the SPL, *
- * indicate your decision by deleting the provisions above and replace *
- * them with the notice and other provisions required by the LGPL. If you *
- * do not delete the provisions above, a recipient may use your version of *
- * this file under either the SPL or the LGPL. *
- * *
- * Patrick Niemeyer (pat@pat.net) *
- * Author of Learning Java, O'Reilly & Associates *
- * http://www.pat.net/~pat/ *
- * *
- *****************************************************************************/
- 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;
- }
- }