129 lines
5.3 KiB
C++
129 lines
5.3 KiB
C++
/*************************************************************************/
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/* script_iterator.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "script_iterator.h"
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// This implementation is derived from ICU: icu4c/source/extra/scrptrun/scrptrun.cpp
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bool ScriptIterator::same_script(int32_t p_script_one, int32_t p_script_two) {
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return p_script_one <= USCRIPT_INHERITED || p_script_two <= USCRIPT_INHERITED || p_script_one == p_script_two;
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}
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ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length) {
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struct ParenStackEntry {
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int pair_index;
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UScriptCode script_code;
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};
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if (p_start >= p_length) {
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p_start = p_length - 1;
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}
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if (p_start < 0) {
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p_start = 0;
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}
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int paren_size = PAREN_STACK_DEPTH;
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ParenStackEntry *paren_stack = (ParenStackEntry *)memalloc(paren_size * sizeof(ParenStackEntry));
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int script_start;
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int script_end = p_start;
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UScriptCode script_code;
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int paren_sp = -1;
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int start_sp = paren_sp;
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UErrorCode err = U_ZERO_ERROR;
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const char32_t *str = p_string.ptr();
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do {
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script_code = USCRIPT_COMMON;
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for (script_start = script_end; script_end < p_length; script_end++) {
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UChar32 ch = str[script_end];
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UScriptCode sc = uscript_getScript(ch, &err);
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if (U_FAILURE(err)) {
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memfree(paren_stack);
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ERR_FAIL_MSG(u_errorName(err));
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}
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if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) != U_BPT_NONE) {
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if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_OPEN) {
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// If it's an open character, push it onto the stack.
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paren_sp++;
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if (unlikely(paren_sp >= paren_size)) {
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// If the stack is full, allocate more space to handle deeply nested parentheses. This is unlikely to happen with any real text.
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paren_size += PAREN_STACK_DEPTH;
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paren_stack = (ParenStackEntry *)memrealloc(paren_stack, paren_size * sizeof(ParenStackEntry));
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}
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paren_stack[paren_sp].pair_index = ch;
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paren_stack[paren_sp].script_code = script_code;
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} else if (paren_sp >= 0) {
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// If it's a close character, find the matching open on the stack, and use that script code. Any non-matching open characters above it on the stack will be poped.
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UChar32 paired_ch = u_getBidiPairedBracket(ch);
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while (paren_sp >= 0 && paren_stack[paren_sp].pair_index != paired_ch) {
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paren_sp -= 1;
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}
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if (paren_sp < start_sp) {
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start_sp = paren_sp;
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}
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if (paren_sp >= 0) {
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sc = paren_stack[paren_sp].script_code;
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}
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}
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}
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if (same_script(script_code, sc)) {
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if (script_code <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
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script_code = sc;
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// Now that we have a final script code, fix any open characters we pushed before we knew the script code.
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while (start_sp < paren_sp) {
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paren_stack[++start_sp].script_code = script_code;
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}
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}
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if ((u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_CLOSE) && paren_sp >= 0) {
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// If this character is a close paired character pop the matching open character from the stack.
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paren_sp -= 1;
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if (start_sp >= 0) {
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start_sp -= 1;
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}
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}
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} else {
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break;
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}
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}
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ScriptRange rng;
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rng.script = hb_icu_script_to_script(script_code);
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rng.start = script_start;
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rng.end = script_end;
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script_ranges.push_back(rng);
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} while (script_end < p_length);
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memfree(paren_stack);
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}
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