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authorMichael Lutz <michi@icosahedron.de>2018-10-21 18:40:39 +0200
committerMichael Lutz <michi@icosahedron.de>2018-12-08 20:13:27 +0100
commit4bf216993a1df7a29922bf34e2d8191460842452 (patch)
treea8de9ee762949c1cb0fb07f0d14d6ebdeb1e5510 /src/os
parent8d7cd6a5262ae151e30fe6db18d04648ebe9d8d7 (diff)
downloadopenttd-4bf216993a1df7a29922bf34e2d8191460842452.tar.xz
Add: [OSX] Native text caret handling.
Diffstat (limited to 'src/os')
-rw-r--r--src/os/macosx/string_osx.cpp122
-rw-r--r--src/os/macosx/string_osx.h26
2 files changed, 148 insertions, 0 deletions
diff --git a/src/os/macosx/string_osx.cpp b/src/os/macosx/string_osx.cpp
index 93c50722b..4698f601b 100644
--- a/src/os/macosx/string_osx.cpp
+++ b/src/os/macosx/string_osx.cpp
@@ -11,6 +11,7 @@
#include "../../stdafx.h"
#include "string_osx.h"
+#include "../../string_func.h"
#include "macos.h"
#include <CoreFoundation/CoreFoundation.h>
@@ -56,6 +57,122 @@ int MacOSStringCompare(const char *s1, const char *s2)
return (int)res + 2;
}
+
+/* virtual */ void OSXStringIterator::SetString(const char *s)
+{
+ const char *string_base = s;
+
+ this->utf16_to_utf8.clear();
+ this->str_info.clear();
+ this->cur_pos = 0;
+
+ /* CoreText operates on UTF-16, thus we have to convert the input string.
+ * To be able to return proper offsets, we have to create a mapping at the same time. */
+ std::vector<UniChar> utf16_str; ///< UTF-16 copy of the string.
+ while (*s != '\0') {
+ size_t idx = s - string_base;
+
+ WChar c = Utf8Consume(&s);
+ if (c < 0x10000) {
+ utf16_str.push_back((UniChar)c);
+ } else {
+ /* Make a surrogate pair. */
+ utf16_str.push_back((UniChar)(0xD800 + ((c - 0x10000) >> 10)));
+ utf16_str.push_back((UniChar)(0xDC00 + ((c - 0x10000) & 0x3FF)));
+ this->utf16_to_utf8.push_back(idx);
+ }
+ this->utf16_to_utf8.push_back(idx);
+ }
+ this->utf16_to_utf8.push_back(s - string_base);
+
+ /* Query CoreText for word and cluster break information. */
+ this->str_info.resize(utf16_to_utf8.size());
+
+ if (utf16_str.size() > 0) {
+ CFStringRef str = CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, &utf16_str[0], utf16_str.size(), kCFAllocatorNull);
+
+ /* Get cluster breaks. */
+ for (CFIndex i = 0; i < CFStringGetLength(str); ) {
+ CFRange r = CFStringGetRangeOfComposedCharactersAtIndex(str, i);
+ this->str_info[r.location].char_stop = true;
+
+ i += r.length;
+ }
+
+ /* Get word breaks. */
+ CFStringTokenizerRef tokenizer = CFStringTokenizerCreate(kCFAllocatorDefault, str, CFRangeMake(0, CFStringGetLength(str)), kCFStringTokenizerUnitWordBoundary, _osx_locale);
+
+ CFStringTokenizerTokenType tokenType = kCFStringTokenizerTokenNone;
+ while ((tokenType = CFStringTokenizerAdvanceToNextToken(tokenizer)) != kCFStringTokenizerTokenNone) {
+ /* Skip tokens that are white-space or punctuation tokens. */
+ if ((tokenType & kCFStringTokenizerTokenHasNonLettersMask) != kCFStringTokenizerTokenHasNonLettersMask) {
+ CFRange r = CFStringTokenizerGetCurrentTokenRange(tokenizer);
+ this->str_info[r.location].word_stop = true;
+ }
+ }
+
+ CFRelease(tokenizer);
+ CFRelease(str);
+ }
+
+ /* End-of-string is always a valid stopping point. */
+ this->str_info.back().char_stop = true;
+ this->str_info.back().word_stop = true;
+}
+
+/* virtual */ size_t OSXStringIterator::SetCurPosition(size_t pos)
+{
+ /* Convert incoming position to an UTF-16 string index. */
+ size_t utf16_pos = 0;
+ for (size_t i = 0; i < this->utf16_to_utf8.size(); i++) {
+ if (this->utf16_to_utf8[i] == pos) {
+ utf16_pos = i;
+ break;
+ }
+ }
+
+ /* Sanitize in case we get a position inside a grapheme cluster. */
+ while (utf16_pos > 0 && !this->str_info[utf16_pos].char_stop) utf16_pos--;
+ this->cur_pos = utf16_pos;
+
+ return this->utf16_to_utf8[this->cur_pos];
+}
+
+/* virtual */ size_t OSXStringIterator::Next(IterType what)
+{
+ assert(this->cur_pos <= this->utf16_to_utf8.size());
+ assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);
+
+ if (this->cur_pos == this->utf16_to_utf8.size()) return END;
+
+ do {
+ this->cur_pos++;
+ } while (this->cur_pos < this->utf16_to_utf8.size() && (what == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));
+
+ return this->cur_pos == this->utf16_to_utf8.size() ? END : this->utf16_to_utf8[this->cur_pos];
+}
+
+/* virtual */ size_t OSXStringIterator::Prev(IterType what)
+{
+ assert(this->cur_pos <= this->utf16_to_utf8.size());
+ assert(what == StringIterator::ITER_CHARACTER || what == StringIterator::ITER_WORD);
+
+ if (this->cur_pos == 0) return END;
+
+ do {
+ this->cur_pos--;
+ } while (this->cur_pos > 0 && (what == ITER_WORD ? !this->str_info[this->cur_pos].word_stop : !this->str_info[this->cur_pos].char_stop));
+
+ return this->utf16_to_utf8[this->cur_pos];
+}
+
+/* static */ StringIterator *OSXStringIterator::Create()
+{
+ if (!MacOSVersionIsAtLeast(10, 5, 0)) return NULL;
+
+ return new OSXStringIterator();
+}
+
#else
void MacOSSetCurrentLocaleName(const char *iso_code) {}
@@ -63,4 +180,9 @@ int MacOSStringCompare(const char *s1, const char *s2)
{
return 0;
}
+
+/* static */ StringIterator *OSXStringIterator::Create()
+{
+ return NULL;
+}
#endif /* (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) */
diff --git a/src/os/macosx/string_osx.h b/src/os/macosx/string_osx.h
index 90bac48d2..ea7904f54 100644
--- a/src/os/macosx/string_osx.h
+++ b/src/os/macosx/string_osx.h
@@ -12,6 +12,32 @@
#ifndef STRING_OSX_H
#define STRING_OSX_H
+#include "../../gfx_layout.h"
+#include "../../string_base.h"
+#include <vector>
+
+/** String iterator using CoreText as a backend. */
+class OSXStringIterator : public StringIterator {
+ /** Break info for a character. */
+ struct CharInfo {
+ bool word_stop : 1; ///< Code point is suitable as a word break.
+ bool char_stop : 1; ///< Code point is the start of a grapheme cluster, i.e. a "character".
+ };
+
+ std::vector<CharInfo> str_info; ///< Break information for each code point.
+ std::vector<size_t> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
+
+ size_t cur_pos; ///< Current iteration position.
+
+public:
+ virtual void SetString(const char *s);
+ virtual size_t SetCurPosition(size_t pos);
+ virtual size_t Next(IterType what);
+ virtual size_t Prev(IterType what);
+
+ static StringIterator *Create();
+};
+
void MacOSSetCurrentLocaleName(const char *iso_code);
int MacOSStringCompare(const char *s1, const char *s2);