/*

     File: LinePanelController.m

 Abstract: "Select Line" panel controller for TextEdit.

 Enables selecting a single line, range of lines, from start or relative to current selected range.

  Version: 1.9

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#import "LinePanelController.h"

#import "TextEditErrors.h"

#import "TextEditMisc.h"

#import "Controller.h"

@implementation LinePanelController

- (id)init {

    return [super initWithWindowNibName:@"SelectLinePanel"];

}

- (void)windowDidLoad {

    NSWindow *window = [self window];

    [window setIdentifier:@"Line"];

    [window setRestorationClass:[self class]];

    [super windowDidLoad];  // It's documented to do nothing, but still a good idea to invoke...

}

/* Reopen the line panel when the app's persistent state is restored. 

*/

+ (void)restoreWindowWithIdentifier:(NSString *)identifier state:(NSCoder *)state completionHandler:(void (^)(NSWindow *, NSError *))completionHandler {

    completionHandler([[(Controller *)[NSApp delegate] lineController] window], NULL);

}

/* A short and sweet example of use of NSScanner. Parses user's line specification, in the form of N, or N-M, or +N-M, or -N-M. Returns NO on error. Assumes none of the out parameters are NULL!

*/

- (BOOL)parseLineDescription:(NSString *)desc fromLineSpec:(NSInteger *)fromLine toLineSpec:(NSInteger *)toLine relative:(NSInteger *)relative {

    NSScanner *scanner = [NSScanner localizedScannerWithString:desc];

    *relative = [scanner scanString:@"+" intoString:NULL] ? 1 : ([scanner scanString:@"-" intoString:NULL] ? -1 : 0);       // Look for "+" or "-"; set relative to 1 or -1, or 0 if neither found

    if (![scanner scanInteger:fromLine]) return NO; // Get the "from" spec

    if ([scanner scanString:@"-" intoString:NULL]) {    // If "-" seen, look for the "to" spec

    if (![scanner scanInteger:toLine] || (*toLine < *fromLine)) return NO;      // There needs to be a number that is not less than the "from" spec

    } else {

    *toLine = *fromLine;                // If not a range, set the "to" spec to be the same as "from"

    }

    return [scanner isAtEnd] ? YES : NO;        // If more stuff, error. Note that the scanner skips over white space

}

/* getRange:... gets the range to be selected in the specified textView using the indicated start, end, and relative values

    If relative = 0, then select from start of fromLine to end of toLine. The first line of the text is line 1.

    If relative != 0 then select from start of fromLine lines from current selected range to toLine lines from current selected range.

      toLine == fromLine means a one-line selection

*/

- (BOOL)getRange:(NSRange *)rangePtr inTextView:(NSTextView *)textView fromLineSpec:(NSInteger)fromLine toLineSpec:(NSInteger)toLine relative:(NSInteger)relative {

    NSRange newSelection = {0, 0};  // Character locations for the new selection

    NSString *textString = [textView string];

    if (relative != 0) {        // Depending on relative direction, set the starting point to beginning of line at the start or end of the existing selected range

    NSRange curSel = [textView selectedRange];

    if (relative > 0) curSel.location = NSMaxRange(curSel) - ((curSel.length > 0) ? 1 : 0);

    [textString getLineStart:&newSelection.location end:NULL contentsEnd:NULL forRange:NSMakeRange(curSel.location, 0)];

    } else {

    if (fromLine == 0) return NO;   // "0" is not a valid absolute line spec

    }

    // At this point, newSelection.location points at the beginning of the line we want to start from

    if (relative < 0) {     // Backwards relative from that spot

    for (NSInteger cnt = 1; cnt < fromLine; cnt++) {

        if (newSelection.location == 0) return NO;  // Invalid specification

        NSRange lineRange = [textString lineRangeForRange:NSMakeRange(newSelection.location - 1, 0)];

        newSelection.location = lineRange.location;

    }

    NSInteger end = newSelection.location;  // This now marks the end of the range to be selected

    for (NSInteger cnt = fromLine; cnt <= toLine; cnt++) {

        if (newSelection.location == 0) return NO;  // Invalid specification

        NSRange lineRange = [textString lineRangeForRange:NSMakeRange(newSelection.location - 1, 0)];

        newSelection.location = lineRange.location;

    }

    newSelection.length = end - newSelection.location;

    } else {            // Forwards

    NSInteger textLength = [textString length];

    for (NSInteger cnt = (relative == 0) ? 1 : 0; cnt < fromLine; cnt++) {  // If not a relative selection, we start counting from 1, since the first line is "line 1" to the user

        if (newSelection.location == textLength) return NO;     // Invalid specification

        NSRange lineRange = [textString lineRangeForRange:NSMakeRange(newSelection.location, 0)];

        newSelection.location = NSMaxRange(lineRange);

    }

    NSInteger end = newSelection.location;

    for (NSInteger cnt = fromLine; cnt <= toLine; cnt++) {  // If not relative, the end of the range is an absolute line number; otherwise it's relative

        if (end == textLength) return NO;    // Invalid specification

        NSRange lineRange = [textString lineRangeForRange:NSMakeRange(end, 0)];

        end = NSMaxRange(lineRange);

    }

    newSelection.length = end - newSelection.location;

    }

    if (rangePtr) *rangePtr = newSelection;

    return YES;

}

/* selectLinesUsingDescription:error: selects the specified lines. On error it returns NO and sets *error if not NULL.

*/

- (BOOL)selectLinesUsingDescription:(NSString *)desc error:(NSError **)error {

    id firstResponder = [[NSApp mainWindow] firstResponder];

    if ([firstResponder isKindOfClass:[NSTextView class]]) {

    NSInteger fromLine, toLine, relative;

    if (![self parseLineDescription:desc fromLineSpec:&fromLine toLineSpec:&toLine relative:&relative]) {

        if (error) *error = [NSError errorWithDomain:TextEditErrorDomain code:TextEditInvalidLineSpecification userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:NSLocalizedStringFromTable(@"Invalid line specification \\U201c%@\\U201d.", @"LinePanel", @"Error message indicating invalid line specification for 'Select Line'"), truncatedString(desc, 100)], NSLocalizedDescriptionKey, NSLocalizedStringFromTable(@"Enter a line number or a range of line numbers to select.", @"LinePanel", @"Suggestion for correcting invalid line specification"), NSLocalizedRecoverySuggestionErrorKey, nil]];

        return NO;

    }

    NSRange range;

        if (![self getRange:&range inTextView:firstResponder fromLineSpec:fromLine toLineSpec:toLine relative:relative]) {

        if (error) *error = [NSError errorWithDomain:TextEditErrorDomain code:TextEditOutOfRangeLineSpecification userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:NSLocalizedStringFromTable(@"Invalid line specification \\U201c%@\\U201d.", @"LinePanel", @"Error message indicating invalid line specification for 'Select Line'"), truncatedString(desc, 100)], NSLocalizedDescriptionKey, NSLocalizedStringFromTable(@"Enter a line number or a range of line numbers to select.", @"LinePanel", @"Suggestion for correcting invalid line specification"), NSLocalizedRecoverySuggestionErrorKey, nil]];

        return NO;

    }

    [firstResponder setSelectedRange:range];

    [firstResponder scrollRangeToVisible:range];

    }

    return YES;

}

/* If the user enters a line specification and hits return, we want to order the panel out if successful.  Hence this extra action method.

*/

- (IBAction)lineFieldChanged:(id)sender {

    NSError *error;

    if ([@"" isEqual:[sender stringValue]]) return; // Don't do anything on empty string

    if ([self selectLinesUsingDescription:[sender stringValue] error:&error]) {

    [[self window] orderOut:nil];

    } else {

    [[self window] presentError:error];

    [[self window] makeKeyAndOrderFront:nil];

    }

}

/* Default action for the "Select" button.

*/

- (IBAction)selectClicked:(id)sender {

    NSError *error;

    if ([@"" isEqual:[lineField stringValue]]) return;  // Don't do anything on empty string

    if (![self selectLinesUsingDescription:[lineField stringValue] error:&error]) {

    [[self window] presentError:error];

    [[self window] makeKeyAndOrderFront:nil];

    }

}

@end