Merge pull request #52370 from bruvzg/realloc_paren_stack
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commit
77e8e2f9f5
2 changed files with 20 additions and 2 deletions
modules/text_server_adv
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@ -30,6 +30,8 @@
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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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@ -48,7 +50,8 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
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p_start = 0;
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}
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ParenStackEntry paren_stack[128];
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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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@ -64,13 +67,22 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
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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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paren_stack[++paren_sp].pair_index = ch;
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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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@ -87,11 +99,13 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
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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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@ -109,4 +123,6 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
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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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@ -43,6 +43,8 @@
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#include <hb.h>
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class ScriptIterator {
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static const int PAREN_STACK_DEPTH = 128;
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public:
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struct ScriptRange {
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int start = 0;
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