PageRenderTime 70ms CodeModel.GetById 58ms app.highlight 9ms RepoModel.GetById 1ms app.codeStats 0ms

/jEdit/tags/jedit-4-5-pre1/org/gjt/sp/jedit/bsh/BSHArrayDimensions.java

#
Java | 148 lines | 68 code | 16 blank | 64 comment | 10 complexity | 4e78ab806894eaee07208a9d47889a72 MD5 | raw file
  1/*****************************************************************************
  2 *                                                                           *
  3 *  This file is part of the BeanShell Java Scripting distribution.          *
  4 *  Documentation and updates may be found at http://www.beanshell.org/      *
  5 *                                                                           *
  6 *  Sun Public License Notice:                                               *
  7 *                                                                           *
  8 *  The contents of this file are subject to the Sun Public License Version  *
  9 *  1.0 (the "License"); you may not use this file except in compliance with *
 10 *  the License. A copy of the License is available at http://www.sun.com    * 
 11 *                                                                           *
 12 *  The Original Code is BeanShell. The Initial Developer of the Original    *
 13 *  Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright     *
 14 *  (C) 2000.  All Rights Reserved.                                          *
 15 *                                                                           *
 16 *  GNU Public License Notice:                                               *
 17 *                                                                           *
 18 *  Alternatively, the contents of this file may be used under the terms of  *
 19 *  the GNU Lesser General Public License (the "LGPL"), in which case the    *
 20 *  provisions of LGPL are applicable instead of those above. If you wish to *
 21 *  allow use of your version of this file only under the  terms of the LGPL *
 22 *  and not to allow others to use your version of this file under the SPL,  *
 23 *  indicate your decision by deleting the provisions above and replace      *
 24 *  them with the notice and other provisions required by the LGPL.  If you  *
 25 *  do not delete the provisions above, a recipient may use your version of  *
 26 *  this file under either the SPL or the LGPL.                              *
 27 *                                                                           *
 28 *  Patrick Niemeyer (pat@pat.net)                                           *
 29 *  Author of Learning Java, O'Reilly & Associates                           *
 30 *  http://www.pat.net/~pat/                                                 *
 31 *                                                                           *
 32 *****************************************************************************/
 33
 34
 35package org.gjt.sp.jedit.bsh;
 36
 37import java.lang.reflect.Array;
 38
 39/**
 40	The name of this class is somewhat misleading.  This covers both the case
 41	where there is an array initializer and 
 42*/
 43class BSHArrayDimensions extends SimpleNode
 44{
 45	public Class baseType;
 46    public int numDefinedDims;
 47    public int numUndefinedDims;
 48	/** 
 49		The Length in each defined dimension.  This value set by the eval() 
 50		Since the values can come from Expressions we should be re-eval()d each
 51		time.
 52	*/
 53	public int [] definedDimensions;  
 54
 55    BSHArrayDimensions(int id) { super(id); }
 56
 57    public void addDefinedDimension() { numDefinedDims++; }
 58    public void addUndefinedDimension() { numUndefinedDims++; }
 59
 60    public Object eval( 
 61			Class type, CallStack callstack, Interpreter interpreter ) 
 62		throws EvalError 
 63	{
 64		if ( Interpreter.DEBUG ) Interpreter.debug("array base type = "+type);
 65		baseType = type;
 66		return eval( callstack, interpreter );
 67	}
 68
 69	/**
 70		Evaluate the structure of the array in one of two ways:
 71
 72			a) an initializer exists, evaluate it and return
 73			the fully constructed array object, also record the dimensions
 74			of that array
 75			
 76			b) evaluate and record the lengths in each dimension and 
 77			return void.
 78
 79		The structure of the array dims is maintained in dimensions.
 80	*/
 81    public Object eval( CallStack callstack, Interpreter interpreter )  
 82		throws EvalError
 83    {
 84		SimpleNode child = (SimpleNode)jjtGetChild(0);
 85
 86		/*
 87			Child is array initializer.  Evaluate it and fill in the 
 88			dimensions it returns.  Initialized arrays are always fully defined
 89			(no undefined dimensions to worry about).  
 90			The syntax uses the undefinedDimension count.
 91			e.g. int [][] { 1, 2 };
 92		*/
 93		if (child instanceof BSHArrayInitializer)
 94		{
 95			if ( baseType == null )
 96				throw new EvalError( 
 97					"Internal Array Eval err:  unknown base type", 
 98					this, callstack );
 99
100			Object initValue = ((BSHArrayInitializer)child).eval(
101				baseType, numUndefinedDims, callstack, interpreter);
102
103			Class arrayClass = initValue.getClass();
104			int actualDimensions = Reflect.getArrayDimensions(arrayClass);
105			definedDimensions = new int[ actualDimensions ];
106
107			// Compare with number of dimensions actually created with the
108			// number specified (syntax uses the undefined ones here)
109			if ( definedDimensions.length != numUndefinedDims )
110				throw new EvalError(
111				"Incompatible initializer. Allocation calls for a " + 
112				numUndefinedDims+ " dimensional array, but initializer is a " +
113					actualDimensions + " dimensional array", this, callstack );
114
115			// fill in definedDimensions [] lengths
116			Object arraySlice = initValue;
117			for ( int i = 0; i < definedDimensions.length; i++ ) {
118				definedDimensions[i] = Array.getLength( arraySlice );
119				if ( definedDimensions[i] > 0 )
120					arraySlice = Array.get(arraySlice, 0);
121			}
122
123			return initValue;
124		}
125		else 
126		// Evaluate the defined dimensions of the array
127		{
128			definedDimensions = new int[ numDefinedDims ];
129
130			for(int i = 0; i < numDefinedDims; i++)
131			{
132				try {
133					Object length = ((SimpleNode)jjtGetChild(i)).eval(
134						callstack, interpreter);
135					definedDimensions[i] = ((Primitive)length).intValue();
136				}
137				catch(Exception e)
138				{
139					throw new EvalError(
140						"Array index: " + i + 
141						" does not evaluate to an integer", this, callstack );
142				}
143			}
144		}
145
146        return Primitive.VOID;
147    }
148}