165 lines
3.7 KiB
Objective-C
165 lines
3.7 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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* MemoryInspector6BitASCII.m - 6-Bit ASCII 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 "Unicode.h"
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#define ORDER_IN_MENU 10
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#define WORDS_PER_ROW 4
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#define CONTENT_WIDTH 8
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#define NEEDS_ALIGNMENT NO
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#define ALLOWS_EDITING YES
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#define MENU_TITLE @"6-Bit ASCII"
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#define TOOL_TIP @"This column displays the memory content as 6-bit ASCII. " \
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"When editing a cell, use " UNICODE_MIDDLE_DOT_UTF8 " (option-shift-9) " \
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"to keep the current value and " UNICODE_BULLET_UTF8 \
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" (option-8 on an English keyboard or option-ü on a German keyboard) to force zero."
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@interface MemoryInspector6BitASCII : NSFormatter <MemoryInspector>
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{
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}
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@end
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@implementation MemoryInspector6BitASCII
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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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NSMutableString *string = [NSMutableString stringWithCapacity:8];
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int i;
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for (i = 0; i < WORDS_PER_ROW; i++) {
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unsigned short c1 = [[value objectAtIndex:i] intValue];
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unsigned short c0 = c1 >> 6;
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if (c0 == 0)
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c0 = UNICODE_MIDDLE_DOT;
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else if (c0 < 040)
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c0 |= 0100;
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c1 &= 077;
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if (c1 == 0)
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c1 = UNICODE_MIDDLE_DOT;
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else if (c1 < 040)
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c1 |= 0100;
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[string appendFormat:@"%C%C", c0, c1];
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}
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return string;
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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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int i, c0, c1, m0, m1;
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if ([string length] != CONTENT_WIDTH) {
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if (error)
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*error = NSLocalizedString(@"Exactly eight characters required.", @"");
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return FALSE;
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}
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m1 = c1 = 0; // only to avoid "used uninitialized" compiler warning
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NSMutableArray *val = [NSMutableArray arrayWithCapacity:WORDS_PER_ROW];
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for (i = 0; i < CONTENT_WIDTH; i++) {
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c0 = [string characterAtIndex:i];
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m0 = 0770000;
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if (c0 == UNICODE_MIDDLE_DOT) // don't care, save old value
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c0 = m0 = 0;
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else if (c0 == UNICODE_BULLET) // force zero
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c0 = 0;
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else if (040 <= c0 && c0 < 0140)
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c0 &= 077;
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else {
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if (error)
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*error = [NSString stringWithFormat:NSLocalizedString(
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@"Invalid 6-bit ASCII character %C%C%C.", @""),
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UNICODE_LEFT_DOUBLEQUOTE, c0, UNICODE_RIGHT_DOUBLEQUOTE];
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return FALSE;
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}
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if (i & 1)
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[val addObject:[NSNumber numberWithInt:m1 | m0 | c1 | c0]];
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else {
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c1 = c0 << 6;
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m1 = m0 << 6;
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}
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}
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*value = val;
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return TRUE;
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}
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@end
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