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/*
* Copyright (c) 2008-2012 Martin Hedenfalk <martin@vicoapp.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#import "NSScanner-additions.h"
#include "logging.h"

@implementation NSScanner (additions)

- (unichar)peek
{
if ([self isAtEnd])
return 0;
return [[self string] characterAtIndex:[self scanLocation]];
}

- (void)inc
{
if (![self isAtEnd])
[self setScanLocation:[self scanLocation] + 1];
}

- (BOOL)expectCharacter:(unichar)ch
{
if ([self peek] == ch) {
[self inc];
return YES;
}
return NO;
}

- (BOOL)scanCharacter:(unichar *)ch
{
if ([self isAtEnd])
return NO;
if (ch)
*ch = [[self string] characterAtIndex:[self scanLocation]];
[self inc];
return YES;
}

- (BOOL)scanUpToUnescapedCharacterFromSet:(NSCharacterSet *)toCharSet
appendToString:(NSMutableString *)s
stripEscapes:(BOOL)stripEscapes
{
unichar ch;
BOOL gotChar = NO;

while ([self scanCharacter:&ch]) {
if (ch == '\\') {
if ([self scanCharacter:&ch]) {
if (!stripEscapes)
[s appendString:@"\\"];
[s appendFormat:@"%C", ch];
} else
[s appendString:@"\\"];
} else if ([toCharSet characterIsMember:ch]) {
/* Don't swallow the end character. */
gotChar = YES;
[self setScanLocation:[self scanLocation] - 1];
break;
} else
[s appendFormat:@"%C", ch];
}

DEBUG(@"scanned escaped string [%@]", s);

return gotChar ? YES : NO;
}

- (BOOL)scanUpToUnescapedCharacterFromSet:(NSCharacterSet *)toCharSet
intoString:(NSString **)string
stripEscapes:(BOOL)stripEscapes
{
NSMutableString *s = [NSMutableString string];
BOOL ret = [self scanUpToUnescapedCharacterFromSet:toCharSet appendToString:s stripEscapes:stripEscapes];
if (string)
*string = s;
return ret;
}

- (BOOL)scanUpToUnescapedCharacter:(unichar)toChar
                        intoString:(NSString **)string
                      stripEscapes:(BOOL)stripEscapes
{
return [self scanUpToUnescapedCharacterFromSet:[NSCharacterSet characterSetWithRange:NSMakeRange(toChar, 1)]
intoString:string
stripEscapes:stripEscapes];
}

- (BOOL)scanUpToUnescapedCharacter:(unichar)toChar
                        intoString:(NSString **)string
{
/* TextMate bundle commands want backslash escapes intact. sh unescapes. */
return [self scanUpToUnescapedCharacter:toChar intoString:string stripEscapes:NO];
}

- (BOOL)scanShellVariableIntoString:(NSString **)intoString
{
NSUInteger startLocation = [self scanLocation];

BOOL initial = YES;

NSMutableCharacterSet *shellVariableSet = nil;
if (shellVariableSet == nil) {
shellVariableSet = [[NSMutableCharacterSet alloc] init];
[shellVariableSet formUnionWithCharacterSet:[NSCharacterSet characterSetWithRange:NSMakeRange('a', 'z' - 'a')]];
[shellVariableSet formUnionWithCharacterSet:[NSCharacterSet characterSetWithRange:NSMakeRange('A', 'Z' - 'A')]];
[shellVariableSet formUnionWithCharacterSet:[NSCharacterSet characterSetWithCharactersInString:@"_"]];
}

while (![self isAtEnd]) {
if (![self scanCharactersFromSet:shellVariableSet intoString:nil])
break;

if (initial) {
[shellVariableSet formUnionWithCharacterSet:[NSCharacterSet characterSetWithRange:NSMakeRange('0', '9' - '0')]];
initial = NO;
}
}

[shellVariableSet release];

if ([self scanLocation] == startLocation)
return NO;

if (intoString)
*intoString = [[self string] substringWithRange:NSMakeRange(startLocation, [self scanLocation] - startLocation)];
return YES;
}

- (BOOL)scanString:(NSString *)aString
{
return [self scanString:aString intoString:nil];
}

- (BOOL)scanKeyCode:(NSInteger *)intoKeyCode
{
[self setCharactersToBeSkipped:nil];

unichar ch;
if (![self scanCharacter:&ch])
return NO;

if (ch == '\\') {
/* Escaped character. */
if ([self scanCharacter:&ch]) {
if (intoKeyCode)
*intoKeyCode = ch;
return YES;
} else {
/* trailing backslash? treat as literal */
if (intoKeyCode)
*intoKeyCode = '\\';
return YES;
}
} else if (ch == '<') {
NSUInteger oldLocation = [self scanLocation];
[self setCaseSensitive:NO];

unsigned int modifiers = 0;
BOOL gotModifier;
do {
gotModifier = YES;
if ([self scanString:@"c-"] ||
[self scanString:@"ctrl-"] ||
[self scanString:@"control-"])
modifiers |= NSControlKeyMask;
else if ([self scanString:@"a-"] ||
[self scanString:@"m-"] ||
[self scanString:@"alt-"] ||
[self scanString:@"option-"] ||
[self scanString:@"meta-"])
modifiers |= NSAlternateKeyMask;
else if ([self scanString:@"s-"] ||
[self scanString:@"shift-"])
modifiers |= NSShiftKeyMask;
else if ([self scanString:@"d-"] ||
[self scanString:@"cmd-"] ||
[self scanString:@"command-"])
modifiers |= NSCommandKeyMask;
else
gotModifier = NO;
} while (gotModifier);

unichar key;
if ([self scanString:@"delete"] ||
[self scanString:@"del"])
key = NSDeleteFunctionKey;
else if ([self scanString:@"left"])
key = NSLeftArrowFunctionKey;
else if ([self scanString:@"right"])
key = NSRightArrowFunctionKey;
else if ([self scanString:@"up"])
key = NSUpArrowFunctionKey;
else if ([self scanString:@"down"])
key = NSDownArrowFunctionKey;
else if ([self scanString:@"pagedown"] ||
[self scanString:@"pgdn"])
key = NSPageDownFunctionKey;
else if ([self scanString:@"pageup"] ||
[self scanString:@"pgup"])
key = NSPageUpFunctionKey;
else if ([self scanString:@"home"])
key = NSHomeFunctionKey;
else if ([self scanString:@"end"])
key = NSEndFunctionKey;
else if ([self scanString:@"insert"] ||
[self scanString:@"ins"])
key = NSInsertFunctionKey;
else if ([self scanString:@"help"])
key = NSHelpFunctionKey;
else if ([self scanString:@"bs"] ||
[self scanString:@"backspace"])
key = 0x7F;
else if ([self scanString:@"tab"])
key = 0x09;
else if ([self scanString:@"escape"] ||
[self scanString:@"esc"])
key = 0x1B;
else if ([self scanString:@"cr"] ||
[self scanString:@"enter"] ||
[self scanString:@"return"])
key = 0x0D;
else if ([self scanString:@"space"])
key = ' ';
else if ([self scanString:@"bar"])
key = '|';
else if ([self scanString:@"lt"])
key = '<';
else if ([self scanString:@"bslash"] ||
[self scanString:@"backslash"])
key = '\\';
else if ([self scanString:@"nl"]) /* ctrl-J */
key = 0x0A;
else if ([self scanString:@"ff"]) /* ctrl-L */
key = 0x0C;
else if ([self scanString:@"nul"])
key = 0x0;
else if ([self scanCharacter:&key]) {
int f;
if ((key == 'f' || key == 'F') && [self scanInt:&f]) {
key = NSF1FunctionKey + f - 1;
} else if (modifiers == NSControlKeyMask &&
((key >= 'a' && key <= 'z') ||
key == '@' ||
(key >= '[' && key <= '_'))) {
/* ASCII control character 0x00 - 0x1F. */
key = tolower(toupper(key) - '@');
modifiers = 0;
}
} else
goto failed;

if (![self scanString:@">"])
goto failed;
if (intoKeyCode)
*intoKeyCode = modifiers | key;
return YES;

failed:
[self setScanLocation:oldLocation];
if (intoKeyCode)
*intoKeyCode = '<';
} else if (intoKeyCode)
*intoKeyCode = ch;
return YES;
}

- (void)skipWhitespace
{
[self scanCharactersFromSet:[NSCharacterSet whitespaceCharacterSet] intoString:nil];
}

@end
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