/*****************************************************************************
* *
* 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;
class
BSHLiteral extends
SimpleNode
{
public
Object value;
BSHLiteral(int
id) { super(
id); }
public
Object eval(
CallStack callstack,
Interpreter interpreter )
throws
EvalError
{
if (
value == null )
throw new
InterpreterError("Null in bsh literal: "+
value);
return
value;
}
private char
getEscapeChar(char
ch)
{
switch(
ch)
{
case 'b':
ch = '\b';
break;
case 't':
ch = '\t';
break;
case 'n':
ch = '\n';
break;
case 'f':
ch = '\f';
break;
case 'r':
ch = '\r';
break;
// do nothing - ch already contains correct character
case '"':
case '\'':
case '\\':
break;
}
return
ch;
}
public void
charSetup(
String str)
{
char
ch =
str.
charAt(0);
if(
ch == '\\')
{
// get next character
ch =
str.
charAt(1);
if(
Character.
isDigit(
ch))
ch = (char)
Integer.
parseInt(
str.
substring(1), 8);
else
ch =
getEscapeChar(
ch);
}
value = new
Primitive(new
Character(
ch).
charValue());
}
void
stringSetup(
String str)
{
StringBuffer buffer = new
StringBuffer();
for(int
i = 0;
i <
str.
length();
i++)
{
char
ch =
str.
charAt(
i);
if(
ch == '\\')
{
// get next character
ch =
str.
charAt(++
i);
if(
Character.
isDigit(
ch))
{
int
endPos =
i;
// check the next two characters
while(
endPos <
i + 2)
{
if(
Character.
isDigit(
str.
charAt(
endPos + 1)))
endPos++;
else
break;
}
ch = (char)
Integer.
parseInt(
str.
substring(
i,
endPos + 1), 8);
i =
endPos;
}
else
ch =
getEscapeChar(
ch);
}
buffer.
append(
ch);
}
value =
buffer.
toString().
intern();
}
}