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Add TextServer parentheses stack dynamic reallocation support.

This commit is contained in:
bruvzg 2021-09-03 09:03:24 +03:00
parent 18c0f0b3ba
commit 49e316f41e
2 changed files with 20 additions and 2 deletions
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20
modules/text_server_adv/script_iterator.cpp
View File

@ -30,6 +30,8 @@
#include "script_iterator.h"
// This implementation is derived from ICU: icu4c/source/extra/scrptrun/scrptrun.cpp
bool ScriptIterator::same_script(int32_t p_script_one, int32_t p_script_two) {
return p_script_one <= USCRIPT_INHERITED || p_script_two <= USCRIPT_INHERITED || p_script_one == p_script_two;
}
@ -48,7 +50,8 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
p_start = 0;
}
ParenStackEntry paren_stack[128];
int paren_size = PAREN_STACK_DEPTH;
ParenStackEntry *paren_stack = (ParenStackEntry *)memalloc(paren_size * sizeof(ParenStackEntry));
int script_start;
int script_end = p_start;
@ -64,13 +67,22 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
UChar32 ch = str[script_end];
UScriptCode sc = uscript_getScript(ch, &err);
if (U_FAILURE(err)) {
memfree(paren_stack);
ERR_FAIL_MSG(u_errorName(err));
}
if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) != U_BPT_NONE) {
if (u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_OPEN) {
paren_stack[++paren_sp].pair_index = ch;
// If it's an open character, push it onto the stack.
paren_sp++;
if (unlikely(paren_sp >= paren_size)) {
// If the stack is full, allocate more space to handle deeply nested parentheses. This is unlikely to happen with any real text.
paren_size += PAREN_STACK_DEPTH;
paren_stack = (ParenStackEntry *)memrealloc(paren_stack, paren_size * sizeof(ParenStackEntry));
}
paren_stack[paren_sp].pair_index = ch;
paren_stack[paren_sp].script_code = script_code;
} else if (paren_sp >= 0) {
// 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.
UChar32 paired_ch = u_getBidiPairedBracket(ch);
while (paren_sp >= 0 && paren_stack[paren_sp].pair_index != paired_ch) {
paren_sp -= 1;
@ -87,11 +99,13 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
if (same_script(script_code, sc)) {
if (script_code <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
script_code = sc;
// Now that we have a final script code, fix any open characters we pushed before we knew the script code.
while (start_sp < paren_sp) {
paren_stack[++start_sp].script_code = script_code;
}
}
if ((u_getIntPropertyValue(ch, UCHAR_BIDI_PAIRED_BRACKET_TYPE) == U_BPT_CLOSE) && paren_sp >= 0) {
// If this character is a close paired character pop the matching open character from the stack.
paren_sp -= 1;
if (start_sp >= 0) {
start_sp -= 1;
@ -109,4 +123,6 @@ ScriptIterator::ScriptIterator(const String &p_string, int p_start, int p_length
script_ranges.push_back(rng);
} while (script_end < p_length);
memfree(paren_stack);
}

2
modules/text_server_adv/script_iterator.h
View File

@ -43,6 +43,8 @@
#include <hb.h>
class ScriptIterator {
static const int PAREN_STACK_DEPTH = 128;
public:
struct ScriptRange {
int start = 0;