/*
* PDP-8/E Simulator
*
* Copyright © 1994-2015 Bernhard Baehr
*
* MemoryInspectorFPP8AFPFloatingPoint.m - FPP8-A FP Floating Point Memory Inspector
*
* This file is part of PDP-8/E Simulator.
*
* PDP-8/E Simulator is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
#import
#import "MemoryInspectorProtocol.h"
#import "FloatingPointNumber.h"
#define ORDER_IN_MENU 80
#define WORDS_PER_ROW 3
#define CONTENT_WIDTH 16
#define NEEDS_ALIGNMENT YES
#define ALLOWS_EDITING YES
#define MENU_TITLE @"FPP8-A FP Floating Point (3 words)"
#define TOOL_TIP @"This column displays the memory content as FPP8-A FP floating point numbers."
@interface MemoryInspectorFPP8AFPFloatingPoint : NSFormatter
{
}
@end
@implementation MemoryInspectorFPP8AFPFloatingPoint
+ (void) load
{
/* dummy to load the class when zero-linking while development */
}
- (NSNumber *) orderInMemoryInspectorMenu
{
return [NSNumber numberWithInt:ORDER_IN_MENU];
}
- (NSString *) menuTitle
{
return NSLocalizedString(MENU_TITLE, @"");
}
- (unsigned) wordsPerRow
{
return WORDS_PER_ROW;
}
- (unsigned) contentWidthInCharacters
{
return CONTENT_WIDTH;
}
- (BOOL) needsMemoryAlignment
{
return NEEDS_ALIGNMENT;
}
- (BOOL) allowsEditing
{
return ALLOWS_EDITING;
}
- (NSString *) toolTipForContentColumn
{
return NSLocalizedString(TOOL_TIP, @"");
}
- (NSString *) stringForObjectValue:(NSArray *)value
{
if ([[value class] isSubclassOfClass:[NSString class]])
return (NSString *) value;
NSAssert ([value count] == WORDS_PER_ROW, @"Invalid number of words to format");
return [[FloatingPointNumber
floatingPointNumberWithExponent:[[value objectAtIndex:0] intValue]
bias:0
negative:([[value objectAtIndex:1] intValue] & 04000) ? YES : NO
twoComplementMantissa:YES
mantissa:([[value objectAtIndex:1] longLongValue] << 53) |
([[value objectAtIndex:2] longLongValue] << 41)]
stringValueWithPrecision:6];
}
- (BOOL) getObjectValue:(id *)value forString:(NSString *)string errorDescription:(NSString **)error
{
FloatingPointNumber *f = [FloatingPointNumber floatingPointNumberFromString:string
withBias:0 withTwoComplementMantissa:YES error:error];
if (! f)
return FALSE;
*value = [NSArray arrayWithObjects:
[NSNumber numberWithInt:077770000 | [f exponent]],
[NSNumber numberWithInt:
077770000 | ([f negative] ? 04000 : 0) | (unsigned long) ([f mantissa] >> 53)],
[NSNumber numberWithInt:077770000 | (unsigned long) (([f mantissa] >> 41) & 07777)],
nil];
return TRUE;
}
@end