137 lines
3.5 KiB
Objective-C
137 lines
3.5 KiB
Objective-C
/*
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* PDP-8/E Simulator
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*
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* Copyright © 1994-2015 Bernhard Baehr
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*
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* MemoryInspectorFPP8AEPFloatingPoint.m - FPP8-A EP Floating Point Memory Inspector
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*
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* This file is part of PDP-8/E Simulator.
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*
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* PDP-8/E Simulator is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#import <Cocoa/Cocoa.h>
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#import "MemoryInspectorProtocol.h"
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#import "FloatingPointNumber.h"
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#define ORDER_IN_MENU 90
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#define WORDS_PER_ROW 6
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#define CONTENT_WIDTH 22
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#define NEEDS_ALIGNMENT YES
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#define ALLOWS_EDITING YES
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#define MENU_TITLE @"FPP8-A EP Floating Point (6 words)"
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#define TOOL_TIP @"This column displays the memory content as FPP8-A EP floating point numbers."
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@interface MemoryInspectorFPP8AEPFloatingPoint : NSFormatter <MemoryInspector>
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{
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}
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@end
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@implementation MemoryInspectorFPP8AEPFloatingPoint
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+ (void) load
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{
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/* dummy to load the class when zero-linking while development */
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}
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- (NSNumber *) orderInMemoryInspectorMenu
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{
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return [NSNumber numberWithInt:ORDER_IN_MENU];
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}
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- (NSString *) menuTitle
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{
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return NSLocalizedString(MENU_TITLE, @"");
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}
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- (unsigned) wordsPerRow
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{
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return WORDS_PER_ROW;
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}
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- (unsigned) contentWidthInCharacters
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{
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return CONTENT_WIDTH;
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}
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- (BOOL) needsMemoryAlignment
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{
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return NEEDS_ALIGNMENT;
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}
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- (BOOL) allowsEditing
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{
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return ALLOWS_EDITING;
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}
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- (NSString *) toolTipForContentColumn
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{
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return NSLocalizedString(TOOL_TIP, @"");
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}
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- (NSString *) stringForObjectValue:(NSArray *)value
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{
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if ([[value class] isSubclassOfClass:[NSString class]])
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return (NSString *) value;
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NSAssert ([value count] == WORDS_PER_ROW, @"Invalid number of words to format");
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return [[FloatingPointNumber
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floatingPointNumberWithExponent:[[value objectAtIndex:0] intValue]
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bias:0
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negative:([[value objectAtIndex:1] intValue] & 04000) ? YES : NO
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twoComplementMantissa:YES
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mantissa:([[value objectAtIndex:1] longLongValue] << 53) |
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([[value objectAtIndex:2] longLongValue] << 41) |
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([[value objectAtIndex:3] longLongValue] << 29) |
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([[value objectAtIndex:4] longLongValue] << 17) |
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([[value objectAtIndex:5] longLongValue] << 5)]
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stringValueWithPrecision:15];
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}
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- (BOOL) getObjectValue:(id *)value forString:(NSString *)string errorDescription:(NSString **)error
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{
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FloatingPointNumber *f = [FloatingPointNumber floatingPointNumberFromString:string
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withBias:0 withTwoComplementMantissa:YES error:error];
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if (! f)
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return FALSE;
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unsigned long long mantissa = [f mantissa];
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*value = [NSArray arrayWithObjects:
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[NSNumber numberWithInt:077770000 | [f exponent]],
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[NSNumber numberWithInt:
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077770000 | ([f negative] ? 04000 : 0) | (unsigned long) (mantissa >> 53)],
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[NSNumber numberWithInt:077770000 | (unsigned long) ((mantissa >> 41) & 07777)],
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[NSNumber numberWithInt:077770000 | (unsigned long) ((mantissa >> 29) & 07777)],
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[NSNumber numberWithInt:077770000 | (unsigned long) ((mantissa >> 17) & 07777)],
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[NSNumber numberWithInt:077770000 | (unsigned long) ((mantissa >> 5) & 07777)],
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nil];
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return TRUE;
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}
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@end
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