Fix syntax highlighting for emoji et al. #2044

Voodoo magic provided by @Bibiko ;)

Source/SPParserUtils.c

@@ -31,18 +31,36 @@
#include "SPParserUtils.h"
#include <stdint.h>

#define SIZET (sizeof(size_t))
#define SIZET1 (SIZET - 1)
#define SBYTE (SIZET1 * 8)

#define ONEMASK ((size_t)(-1) / 0xFF)
#define ONEMASK8 (ONEMASK * 0x80)
#define FMASK ((size_t)(-1)*(ONEMASK*0xf)-1)

// adapted from http://www.daemonology.net/blog/2008-06-05-faster-utf8-strlen.html
size_t utf8strlen(const char * _s)
{
	
	/* Due to [NSString length] behaviour for chars > 0xFFFF {length = 2}
	 "correct" the variable 'count' by subtraction the number
	 of occurrences of the start byte 0xF0 (4-byte UTF-8 char).
	 Here we assume that only up to 4-byte UTF-8 chars
	 are allowed [latest UTF-8 specification].
	 
	 Marked in the source code by "CORRECT".
	 */
	
	const char * s;
	size_t count = 0;
	size_t u;
	long count = 0;
	size_t u = 0;
	size_t u1 = 0;
	unsigned char b;
	
	
	/* Handle any initial misaligned bytes. */
	for (s = _s; (uintptr_t)(s) & (sizeof(size_t) - 1); s++) {
	for (s = _s; (uintptr_t)(s) & SIZET1; s++) {
		b = *s;
		
		/* Exit if we hit a zero byte. */
@@ -51,23 +69,33 @@ size_t utf8strlen(const char * _s)
		
		/* Is this byte NOT the first byte of a character? */
		count += (b >> 7) & ((~b) >> 6);
		
		/* CORRECT */
		count -= (b & 0xf0) == 0xf0;
	}
	
	/* Handle complete blocks. */
	for (; ; s += sizeof(size_t)) {
	for (; ; s += SIZET) {
		/* Prefetch 256 bytes ahead. */
		__builtin_prefetch(&s[256], 0, 0);
		
		/* Grab 4 or 8 bytes of UTF-8 data. */
		u = *(size_t *)(s);
		
		/* Exit the loop if there are any zero bytes. */
		if ((u - ONEMASK) & (~u) & (ONEMASK * 0x80))
		if ((u - ONEMASK) & (~u) & ONEMASK8)
			break;
		
		/* CORRECT */
		u1 = u & FMASK;
		u1 = (u1 >> 7) & (u1 >> 6) & (u1 >> 5) & (u1 >> 4);
		if (u1) count -= (u1 * ONEMASK) >> SBYTE;
		
		/* Count bytes which are NOT the first byte of a character. */
		u = ((u & (ONEMASK * 0x80)) >> 7) & ((~u) >> 6);
		count += (u * ONEMASK) >> ((sizeof(size_t) - 1) * 8);
		u = ((u & ONEMASK8) >> 7) & ((~u) >> 6);
		
		count += (u * ONEMASK) >> SBYTE;
		
	}
	
	/* Take care of any left-over bytes. */
@@ -80,6 +108,9 @@ size_t utf8strlen(const char * _s)
		
		/* Is this byte NOT the first byte of a character? */
		count += (b >> 7) & ((~b) >> 6);
		
		/* CORRECT */
		count -= (b & 0xf0) == 0xf0;
	}
	
done:

UnitTests/SPParserUtilsTest.m

@@ -44,6 +44,9 @@ - (void)testUtf8strlen;
@implementation SPParserUtilsTest

- (void)testUtf8strlen {
	// NOTE!!: Those test do not verify that the utf8strlen() function works according to spec,
	//         but whether it produces the same results as NSString for the same input.
	
	const char *empty = "";
	NSString *emptyString = [NSString stringWithCString:empty encoding:NSUTF8StringEncoding];
	STAssertEquals(utf8strlen(empty),[emptyString length], @"empty string");
@@ -52,8 +55,8 @@ - (void)testUtf8strlen {
	// If any of those conditions fail, all of the following assumptions are moot.
	const char *charSeq = "\xF0\x9F\x8D\x8F"; //🍏
	NSString *charString = [NSString stringWithCString:charSeq encoding:NSUTF8StringEncoding];
	STAssertEquals(strlen(charSeq),     4, @"assumption about storage for binary C string");
	STAssertEquals([charString length], 2, @"assumption about NSString internal storage of string");
	STAssertEquals(strlen(charSeq),     (size_t)4, @"assumption about storage for binary C string");
	STAssertEquals([charString length], (NSUInteger)2, @"assumption about NSString internal storage of string");
	
	const char *singleByteSeq = "Hello World!";
	NSString *singleByteString = [NSString stringWithCString:singleByteSeq encoding:NSUTF8StringEncoding];

sequel-pro.xcodeproj/xcshareddata/xcschemes/Sequel Pro.xcscheme

@@ -25,7 +25,7 @@
   <TestAction
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
      shouldUseLaunchSchemeArgsEnv = "YES"
      shouldUseLaunchSchemeArgsEnv = "NO"
      buildConfiguration = "Debug">
      <Testables>
         <TestableReference
@@ -48,6 +48,13 @@
            ReferencedContainer = "container:sequel-pro.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <EnvironmentVariables>
         <EnvironmentVariable
            key = "OBJC_DISABLE_GC"
            value = "YES"
            isEnabled = "YES">
         </EnvironmentVariable>
      </EnvironmentVariables>
   </TestAction>
   <LaunchAction
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"