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// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "libaegisub/character_count.h"
#include "libaegisub/ass/dialogue_parser.h"
#include "libaegisub/exception.h"
#include <unicode/uchar.h>
#include <unicode/utf8.h>
#include <mutex>
#include <unicode/brkiter.h>
namespace {
struct utext_deleter {
void operator()(UText *ut) { if (ut) utext_close(ut); }
};
using utext_ptr = std::unique_ptr<UText, utext_deleter>;
icu::BreakIterator& get_break_iterator(const char *ptr, size_t len) {
static std::unique_ptr<icu::BreakIterator> bi;
static std::once_flag token;
std::call_once(token, [&] {
UErrorCode status = U_ZERO_ERROR;
bi.reset(icu::BreakIterator::createCharacterInstance(icu::Locale::getDefault(), status));
if (U_FAILURE(status)) throw agi::InternalError("Failed to create character iterator");
});
UErrorCode err = U_ZERO_ERROR;
utext_ptr ut(utext_openUTF8(nullptr, ptr, len, &err));
if (U_FAILURE(err)) throw agi::InternalError("Failed to open utext");
bi->setText(ut.get(), err);
if (U_FAILURE(err)) throw agi::InternalError("Failed to set break iterator text");
return *bi;
}
template <typename Iterator>
size_t count_in_range(Iterator begin, Iterator end, int mask) {
if (begin == end) return 0;
auto& character_bi = get_break_iterator(&*begin, end - begin);
size_t count = 0;
auto pos = character_bi.first();
for (auto end = character_bi.next(); end != icu::BreakIterator::DONE; pos = end, end = character_bi.next()) {
if (!mask)
++count;
else {
UChar32 c;
int i = 0;
U8_NEXT_UNSAFE(begin + pos, i, c);
if ((U_GET_GC_MASK(c) & mask) == 0)
++count;
}
}
return count;
}
int ignore_mask_to_icu_mask(int mask) {
int ret = 0;
if (mask & agi::IGNORE_PUNCTUATION)
ret |= U_GC_P_MASK;
if (mask & agi::IGNORE_WHITESPACE)
ret |= U_GC_Z_MASK;
return ret;
}
}
namespace agi {
size_t CharacterCount(std::string::const_iterator begin, std::string::const_iterator end, int ignore) {
int mask = ignore_mask_to_icu_mask(ignore);
if ((ignore & agi::IGNORE_BLOCKS) == 0)
return count_in_range(begin, end, mask);
size_t characters = 0;
auto pos = begin;
do {
auto it = std::find(pos, end, '{');
characters += count_in_range(pos, it, mask);
if (it == end) break;
pos = std::find(pos, end, '}');
if (pos == end) {
characters += count_in_range(it, pos, mask);
break;
}
} while (++pos != end);
return characters;
}
size_t CharacterCount(std::string const& str, int mask) {
return CharacterCount(begin(str), end(str), mask);
}
size_t MaxLineLength(std::string const& text, int mask) {
mask = ignore_mask_to_icu_mask(mask);
auto tokens = agi::ass::TokenizeDialogueBody(text);
agi::ass::MarkDrawings(text, tokens);
size_t pos = 0;
size_t max_line_length = 0;
size_t current_line_length = 0;
for (auto token : tokens) {
if (token.type == agi::ass::DialogueTokenType::LINE_BREAK) {
if (text[pos + 1] == 'h') {
if (!(mask & U_GC_Z_MASK))
current_line_length += 1;
}
else { // N or n
max_line_length = std::max(max_line_length, current_line_length);
current_line_length = 0;
}
}
else if (token.type == agi::ass::DialogueTokenType::TEXT)
current_line_length += count_in_range(begin(text) + pos, begin(text) + pos + token.length, mask);
pos += token.length;
}
return std::max(max_line_length, current_line_length);
}
size_t IndexOfCharacter(std::string const& str, size_t n) {
if (str.empty() || n == 0) return 0;
auto& bi = get_break_iterator(&str[0], str.size());
for (auto pos = bi.first(), end = bi.next(); ; --n, pos = end, end = bi.next()) {
if (end == icu::BreakIterator::DONE)
return str.size();
if (n == 0)
return pos;
}
}
}
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