mirror of
https://github.com/neoStudiosLCE/neoLegacy.git
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e786604228
This commit introduces Arabic text shaping in the chat application by adding `ArabicShaping.cpp` and `ArabicShaping.h` for handling contextual forms and visual reordering. The rendering logic in `ChatScreen.cpp` is updated to utilize this new functionality, adjusting cursor positions accordingly. Other UI components, including `UIControl_Base.cpp`, `UIControl_Label.cpp`, and `UIControl_SaveList.cpp`, are modified to ensure proper display of Arabic text. Additionally, `Font.cpp` is enhanced with methods for efficient rendering of pre-shaped text.
557 lines
18 KiB
C++
557 lines
18 KiB
C++
#include "stdafx.h"
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#include "ArabicShaping.h"
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#include <vector>
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#include <unordered_map>
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// Arabic text shaping - contextual form selection and RTL visual reordering.
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// Ported from "Arabic Writer" JS reference by Omar Muhammad (GPL).
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// Each entry: base char, isolated, initial, medial, final forms
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struct ArabicCharEntry
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{
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wchar_t base;
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wchar_t isolated;
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wchar_t initial;
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wchar_t medial;
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wchar_t final_;
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bool connectsLeft;
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bool connectsRight;
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};
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// Core Arabic + extended (Farsi/Urdu) characters with presentation forms
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static const ArabicCharEntry arabicChars[] =
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{
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// base isolated initial medial final cL cR
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{ 0x0621, 0xFE80, 0xFE80, 0xFE80, 0xFE80, false, false }, // hamza
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{ 0x0622, 0xFE81, 0xFE81, 0xFE82, 0xFE82, false, true }, // alef madda
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{ 0x0623, 0xFE83, 0xFE83, 0xFE84, 0xFE84, false, true }, // alef hamza above
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{ 0x0624, 0xFE85, 0xFE85, 0xFE86, 0xFE86, false, true }, // waw hamza
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{ 0x0625, 0xFE87, 0xFE87, 0xFE88, 0xFE88, false, true }, // alef hamza below
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{ 0x0626, 0xFE89, 0xFE8B, 0xFE8C, 0xFE8A, true, true }, // yeh hamza
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{ 0x0627, 0xFE8D, 0xFE8D, 0xFE8E, 0xFE8E, false, true }, // alef
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{ 0x0628, 0xFE8F, 0xFE91, 0xFE92, 0xFE90, true, true }, // beh
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{ 0x0629, 0xFE93, 0xFE93, 0xFE94, 0xFE94, false, true }, // teh marbuta
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{ 0x062A, 0xFE95, 0xFE97, 0xFE98, 0xFE96, true, true }, // teh
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{ 0x062B, 0xFE99, 0xFE9B, 0xFE9C, 0xFE9A, true, true }, // theh
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{ 0x062C, 0xFE9D, 0xFE9F, 0xFEA0, 0xFE9E, true, true }, // jeem
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{ 0x062D, 0xFEA1, 0xFEA3, 0xFEA4, 0xFEA2, true, true }, // hah
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{ 0x062E, 0xFEA5, 0xFEA7, 0xFEA8, 0xFEA6, true, true }, // khah
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{ 0x062F, 0xFEA9, 0xFEA9, 0xFEAA, 0xFEAA, false, true }, // dal
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{ 0x0630, 0xFEAB, 0xFEAB, 0xFEAC, 0xFEAC, false, true }, // thal
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{ 0x0631, 0xFEAD, 0xFEAD, 0xFEAE, 0xFEAE, false, true }, // reh
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{ 0x0632, 0xFEAF, 0xFEAF, 0xFEB0, 0xFEB0, false, true }, // zain
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{ 0x0633, 0xFEB1, 0xFEB3, 0xFEB4, 0xFEB2, true, true }, // seen
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{ 0x0634, 0xFEB5, 0xFEB7, 0xFEB8, 0xFEB6, true, true }, // sheen
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{ 0x0635, 0xFEB9, 0xFEBB, 0xFEBC, 0xFEBA, true, true }, // sad
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{ 0x0636, 0xFEBD, 0xFEBF, 0xFEC0, 0xFEBE, true, true }, // dad
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{ 0x0637, 0xFEC1, 0xFEC3, 0xFEC4, 0xFEC2, true, true }, // tah
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{ 0x0638, 0xFEC5, 0xFEC7, 0xFEC8, 0xFEC6, true, true }, // zah
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{ 0x0639, 0xFEC9, 0xFECB, 0xFECC, 0xFECA, true, true }, // ain
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{ 0x063A, 0xFECD, 0xFECF, 0xFED0, 0xFECE, true, true }, // ghain
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{ 0x0640, 0x0640, 0x0640, 0x0640, 0x0640, true, true }, // tatweel
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{ 0x0641, 0xFED1, 0xFED3, 0xFED4, 0xFED2, true, true }, // feh
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{ 0x0642, 0xFED5, 0xFED7, 0xFED8, 0xFED6, true, true }, // qaf
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{ 0x0643, 0xFED9, 0xFEDB, 0xFEDC, 0xFEDA, true, true }, // kaf
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{ 0x0644, 0xFEDD, 0xFEDF, 0xFEE0, 0xFEDE, true, true }, // lam
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{ 0x0645, 0xFEE1, 0xFEE3, 0xFEE4, 0xFEE2, true, true }, // meem
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{ 0x0646, 0xFEE5, 0xFEE7, 0xFEE8, 0xFEE6, true, true }, // noon
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{ 0x0647, 0xFEE9, 0xFEEB, 0xFEEC, 0xFEEA, true, true }, // heh
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{ 0x0648, 0xFEED, 0xFEED, 0xFEEE, 0xFEEE, false, true }, // waw
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{ 0x0649, 0xFEEF, 0xFEEF, 0xFEF0, 0xFEF0, false, true }, // alef maksura
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{ 0x064A, 0xFEF1, 0xFEF3, 0xFEF4, 0xFEF2, true, true }, // yeh
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// Extended - Farsi/Urdu
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{ 0x067E, 0xFB56, 0xFB58, 0xFB59, 0xFB57, true, true }, // peh
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{ 0x0686, 0xFB7A, 0xFB7C, 0xFB7D, 0xFB7B, true, true }, // tcheh
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{ 0x0698, 0xFB8A, 0xFB8A, 0xFB8B, 0xFB8B, false, true }, // jeh
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{ 0x06A9, 0xFB8E, 0xFB90, 0xFB91, 0xFB8F, true, true }, // keheh (Farsi kaf)
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{ 0x06AF, 0xFB92, 0xFB94, 0xFB95, 0xFB93, true, true }, // gaf
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{ 0x06CC, 0xFBFC, 0xFBFE, 0xFBFF, 0xFBFD, true, true }, // Farsi yeh
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// Urdu
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{ 0x0679, 0xFB66, 0xFB68, 0xFB69, 0xFB67, true, true }, // tteh
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{ 0x0688, 0xFB88, 0xFB88, 0xFB89, 0xFB89, false, true }, // ddal
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{ 0x0691, 0xFB8C, 0xFB8C, 0xFB8D, 0xFB8D, false, true }, // rreh
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{ 0x06C1, 0xFBA6, 0xFBA8, 0xFBA9, 0xFBA7, true, true }, // heh goal
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{ 0x06D2, 0xFBAE, 0xFBAE, 0xFBAF, 0xFBAF, false, true }, // yeh barree
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};
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static const int ARABIC_CHAR_COUNT = sizeof(arabicChars) / sizeof(arabicChars[0]);
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// Laam-Alef ligatures: when lam (0x0644) is followed by certain alef forms
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struct LaamAlefEntry
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{
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wchar_t alef; // the alef variant
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wchar_t isolated; // ligature isolated form
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wchar_t final_; // ligature final form
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};
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static const LaamAlefEntry laamAlefTable[] =
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{
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{ 0x0622, 0xFEF5, 0xFEF6 }, // lam + alef madda
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{ 0x0623, 0xFEF7, 0xFEF8 }, // lam + alef hamza above
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{ 0x0625, 0xFEF9, 0xFEFA }, // lam + alef hamza below
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{ 0x0627, 0xFEFB, 0xFEFC }, // lam + alef
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};
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// Build lookup map on first use
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static std::unordered_map<wchar_t, const ArabicCharEntry*> charMap;
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static bool tablesInitialized = false;
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static void initTables()
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{
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if (tablesInitialized) return;
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for (int i = 0; i < ARABIC_CHAR_COUNT; i++)
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{
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charMap[arabicChars[i].base] = &arabicChars[i];
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}
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tablesInitialized = true;
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}
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static bool isArabicChar(wchar_t c)
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{
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return (c >= 0x0600 && c <= 0x06FF) || (c >= 0xFB50 && c <= 0xFDFF) || (c >= 0xFE70 && c <= 0xFEFF);
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}
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static bool isHaraka(wchar_t c)
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{
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// Arabic diacritics (tashkeel/harakat): U+0610-U+061A, U+064B-U+065F, U+0670
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return (c >= 0x064B && c <= 0x065F) || (c >= 0x0610 && c <= 0x061A) || c == 0x0670;
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}
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static bool isLaamAlefLigature(wchar_t c)
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{
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// Laam-Alef presentation forms: U+FEF5-U+FEFC
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return c >= 0xFEF5 && c <= 0xFEFC;
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}
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static bool isDigit(wchar_t c)
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{
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// Western digits and Arabic-Indic digits
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return (c >= L'0' && c <= L'9') || (c >= 0x0660 && c <= 0x0669);
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}
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// Neutral characters that inherit direction from surrounding context
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static bool isNeutralChar(wchar_t c)
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{
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return c == L' '
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|| c == L'.' || c == L',' || c == L'!' || c == L'?'
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|| c == L':' || c == L';' || c == L'-' || c == L'('
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|| c == L')' || c == L'[' || c == L']'
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|| c == 0x060C // Arabic comma
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|| c == 0x061B // Arabic semicolon
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|| c == 0x061F; // Arabic question mark
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}
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static const ArabicCharEntry* findEntry(wchar_t c)
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{
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auto it = charMap.find(c);
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if (it != charMap.end()) return it->second;
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return nullptr;
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}
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static const LaamAlefEntry* findLaamAlef(wchar_t alef)
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{
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for (int i = 0; i < 4; i++)
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{
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if (laamAlefTable[i].alef == alef) return &laamAlefTable[i];
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}
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return nullptr;
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}
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// -------------------------------------------------------------------------
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// Core shaping logic, shared by both public overloads.
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//
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// logicalToVisual: if non-null, maps input[i] -> position in output string.
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// Must be pre-sized to input.size()+1.
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// -------------------------------------------------------------------------
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static std::wstring shapeArabicTextInternal(const std::wstring& input,
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std::vector<int>* logicalToVisual)
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{
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if (input.empty()) return input;
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initTables();
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// Fast path: check if any base Arabic characters exist
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bool hasArabic = false;
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for (size_t i = 0; i < input.size(); i++)
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{
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if (input[i] >= 0x0600 && input[i] <= 0x06FF)
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{
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hasArabic = true;
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break;
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}
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}
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if (!hasArabic)
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{
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// Identity mapping
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if (logicalToVisual)
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{
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for (size_t i = 0; i <= input.size(); i++)
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(*logicalToVisual)[i] = (int)i;
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}
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return input;
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}
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// -----------------------------------------------------------------------
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// Split into runs: Arabic vs non-Arabic.
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// Track the starting logical index of each run.
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// -----------------------------------------------------------------------
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struct Run
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{
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std::wstring text;
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bool arabic;
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int logicalStart; // index into input[] where this run begins
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};
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std::vector<Run> runs;
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size_t i = 0;
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while (i < input.size())
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{
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bool curArabic = isArabicChar(input[i]) || isHaraka(input[i]);
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Run run;
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run.arabic = curArabic;
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run.logicalStart = (int)i;
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while (i < input.size())
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{
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bool charArabic = isArabicChar(input[i]) || isHaraka(input[i]);
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if (charArabic == curArabic)
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{
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run.text += input[i];
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i++;
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}
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else
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{
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break;
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}
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}
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runs.push_back(run);
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}
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// -----------------------------------------------------------------------
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// Merge neutral runs that sit between two Arabic runs into the preceding
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// Arabic run (with the following Arabic run appended too). This keeps
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// inter-word spaces inside the Arabic run so the whole phrase reverses
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// together, producing correct RTL word order.
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// -----------------------------------------------------------------------
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for (size_t r = 1; r + 1 < runs.size(); r++)
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{
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if (!runs[r].arabic && runs[r - 1].arabic && runs[r + 1].arabic)
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{
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bool allNeutral = true;
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for (wchar_t c : runs[r].text)
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{
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if (!isNeutralChar(c)) { allNeutral = false; break; }
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}
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if (allNeutral)
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{
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// Absorb runs[r] and runs[r+1] into runs[r-1]
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runs[r - 1].text += runs[r].text + runs[r + 1].text;
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runs.erase(runs.begin() + r, runs.begin() + r + 2);
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r--; // re-check from same position
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}
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}
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}
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// Recompute logical starts after merging (run text lengths may have grown)
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{
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int pos = 0;
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for (size_t r = 0; r < runs.size(); r++)
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{
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runs[r].logicalStart = pos;
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pos += (int)runs[r].text.size();
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}
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}
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// -----------------------------------------------------------------------
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// Shape each Arabic run.
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// For each run we also build a posMap: posMap[localLogical] = localVisual
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// (local means within the run's text, before run offsets are added).
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// -----------------------------------------------------------------------
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std::vector<std::vector<int>> runPosMap(runs.size()); // per-run local maps
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for (size_t r = 0; r < runs.size(); r++)
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{
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if (!runs[r].arabic)
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{
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// Non-Arabic: identity mapping
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runPosMap[r].resize(runs[r].text.size() + 1);
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for (size_t j = 0; j <= runs[r].text.size(); j++)
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runPosMap[r][j] = (int)j;
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continue;
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}
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std::wstring& text = runs[r].text;
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const int textLen = (int)text.size();
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// Collect base character indices (skip harakat)
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std::vector<size_t> baseIndices;
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for (size_t j = 0; j < text.size(); j++)
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{
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if (!isHaraka(text[j]))
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baseIndices.push_back(j);
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}
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// ------------------------------------------------------------------
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// Laam-Alef ligatures
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// ------------------------------------------------------------------
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std::vector<bool> consumed(text.size(), false);
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std::vector<std::pair<size_t, wchar_t>> ligatures; // lam idx -> ligature char
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for (size_t bi = 0; bi + 1 < baseIndices.size(); bi++)
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{
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size_t idx = baseIndices[bi];
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size_t nextIdx = baseIndices[bi + 1];
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if (text[idx] == 0x0644) // lam
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{
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const LaamAlefEntry* la = findLaamAlef(text[nextIdx]);
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if (la)
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{
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bool connectsToPrev = false;
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if (bi > 0)
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{
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size_t prevIdx = baseIndices[bi - 1];
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const ArabicCharEntry* prevEntry = findEntry(text[prevIdx]);
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if (prevEntry && prevEntry->connectsLeft)
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connectsToPrev = true;
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}
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wchar_t ligChar = connectsToPrev ? la->final_ : la->isolated;
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ligatures.push_back({ idx, ligChar });
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consumed[nextIdx] = true;
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bi++; // skip the alef
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}
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}
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}
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// Apply ligature characters
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for (size_t li = 0; li < ligatures.size(); li++)
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text[ligatures[li].first] = ligatures[li].second;
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// Rebuild base indices after ligature consumption
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baseIndices.clear();
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for (size_t j = 0; j < text.size(); j++)
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{
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if (!isHaraka(text[j]) && !consumed[j])
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baseIndices.push_back(j);
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}
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// ------------------------------------------------------------------
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// Contextual form selection
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// ------------------------------------------------------------------
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for (size_t bi = 0; bi < baseIndices.size(); bi++)
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{
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size_t idx = baseIndices[bi];
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const ArabicCharEntry* entry = findEntry(text[idx]);
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if (!entry) continue;
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bool prevConnects = false;
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if (bi > 0)
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{
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size_t prevIdx = baseIndices[bi - 1];
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const ArabicCharEntry* prevEntry = findEntry(text[prevIdx]);
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if (prevEntry && prevEntry->connectsLeft)
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prevConnects = true;
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else if (!prevEntry && text[prevIdx] >= 0xFE70)
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prevConnects = false; // lam-alef ligature doesn't connect left
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}
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bool nextConnects = false;
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if (bi + 1 < baseIndices.size())
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{
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size_t nextIdx = baseIndices[bi + 1];
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const ArabicCharEntry* nextEntry = findEntry(text[nextIdx]);
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if (nextEntry && nextEntry->connectsRight)
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nextConnects = true;
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else if (!nextEntry && isLaamAlefLigature(text[nextIdx]))
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nextConnects = true; // lam-alef ligatures always connect to the right
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}
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bool canConnectPrev = prevConnects && entry->connectsRight;
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bool canConnectNext = nextConnects && entry->connectsLeft;
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if (canConnectPrev && canConnectNext) text[idx] = entry->medial;
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else if (canConnectPrev) text[idx] = entry->final_;
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else if (canConnectNext) text[idx] = entry->initial;
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else text[idx] = entry->isolated;
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}
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// ------------------------------------------------------------------
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// Build shaped string (drop consumed ligature partners)
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// and a forward mapping: shapedIdx[logicalPos] = position in shaped
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// (for consumed chars, map to the ligature position)
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// ------------------------------------------------------------------
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std::vector<int> logToShaped(textLen + 1, 0);
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std::wstring shaped;
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// Track where each position of text[] lands in shaped[]
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// consumed chars map to the position of their ligature replacement
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{
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int shapedPos = 0;
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// First record the ligature lam positions so consumed alefs can map there
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// We need to process in order
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for (int j = 0; j < textLen; j++)
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{
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logToShaped[j] = shapedPos;
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if (!consumed[j])
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{
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shaped += text[j];
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shapedPos++;
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}
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// consumed chars: logToShaped[j] stays pointing to the lam position
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// (shapedPos is not incremented, so it already equals lam's slot)
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}
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logToShaped[textLen] = shapedPos; // end-of-run cursor
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}
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// ------------------------------------------------------------------
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// Reverse for RTL visual order, preserving LTR digit sequences.
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// Also build reversedPos[posInShaped] -> posInReversed.
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// ------------------------------------------------------------------
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const int shapedLen = (int)shaped.size();
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std::wstring reversed;
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reversed.reserve(shapedLen);
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// reversedOf[i] = where shaped[i] ended up in reversed[]
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std::vector<int> reversedOf(shapedLen, 0);
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// We'll do a two-pass approach:
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// 1. Walk shaped backwards, collecting digit runs and individual chars
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// 2. For each element we emit, record reversedOf[]
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// Collect output segments: each segment is (isDigitSeq, startInShaped, len)
|
|
struct Seg { int start; int len; bool isDigit; };
|
|
std::vector<Seg> segs;
|
|
{
|
|
int j = shapedLen - 1;
|
|
while (j >= 0)
|
|
{
|
|
if (isDigit(shaped[j]))
|
|
{
|
|
// Find the full digit run (going left from j)
|
|
int end = j;
|
|
while (j >= 0 && isDigit(shaped[j])) j--;
|
|
int start = j + 1;
|
|
segs.push_back({ start, end - start + 1, true });
|
|
}
|
|
else
|
|
{
|
|
segs.push_back({ j, 1, false });
|
|
j--;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Emit segments in order, recording reversedOf[]
|
|
{
|
|
int outPos = 0;
|
|
for (size_t s = 0; s < segs.size(); s++)
|
|
{
|
|
const Seg& seg = segs[s];
|
|
if (seg.isDigit)
|
|
{
|
|
// Digit sequence: output in LTR order (start..start+len-1)
|
|
for (int k = seg.start; k < seg.start + seg.len; k++)
|
|
{
|
|
reversedOf[k] = outPos;
|
|
reversed += shaped[k];
|
|
outPos++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Single non-digit char
|
|
reversedOf[seg.start] = outPos;
|
|
reversed += shaped[seg.start];
|
|
outPos++;
|
|
}
|
|
}
|
|
}
|
|
|
|
runs[r].text = reversed;
|
|
|
|
// ------------------------------------------------------------------
|
|
// Build the local logical->visual position map for this run.
|
|
// Cursor positions are between characters: for RTL text, cursor
|
|
// at shaped position p maps to visual position (shapedLen - p).
|
|
// ------------------------------------------------------------------
|
|
if (logicalToVisual)
|
|
{
|
|
runPosMap[r].resize(textLen + 1);
|
|
for (int j = 0; j <= textLen; j++)
|
|
{
|
|
int sp = logToShaped[j];
|
|
runPosMap[r][j] = shapedLen - sp;
|
|
}
|
|
}
|
|
}
|
|
|
|
// -----------------------------------------------------------------------
|
|
// Concatenate runs and compute absolute visual positions
|
|
// -----------------------------------------------------------------------
|
|
std::wstring result;
|
|
result.reserve(input.size());
|
|
|
|
// Compute the visual start offset for each run
|
|
std::vector<int> runVisualStart(runs.size(), 0);
|
|
{
|
|
int voff = 0;
|
|
for (size_t r = 0; r < runs.size(); r++)
|
|
{
|
|
runVisualStart[r] = voff;
|
|
voff += (int)runs[r].text.size();
|
|
}
|
|
}
|
|
|
|
for (size_t r = 0; r < runs.size(); r++)
|
|
result += runs[r].text;
|
|
|
|
// -----------------------------------------------------------------------
|
|
// Fill the caller's logicalToVisual[] array
|
|
// -----------------------------------------------------------------------
|
|
if (logicalToVisual)
|
|
{
|
|
// For each input position, find which run it belongs to and map it
|
|
for (size_t r = 0; r < runs.size(); r++)
|
|
{
|
|
int logStart = runs[r].logicalStart;
|
|
|
|
if (r < runPosMap.size() && !runPosMap[r].empty())
|
|
{
|
|
int localLen = (int)runPosMap[r].size() - 1; // number of logical chars
|
|
for (int j = 0; j <= localLen; j++)
|
|
{
|
|
int logIdx = logStart + j;
|
|
if (logIdx <= (int)input.size())
|
|
(*logicalToVisual)[logIdx] = runVisualStart[r] + runPosMap[r][j];
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
// -------------------------------------------------------------------------
|
|
// Public API
|
|
// -------------------------------------------------------------------------
|
|
|
|
std::wstring shapeArabicText(const std::wstring& input)
|
|
{
|
|
return shapeArabicTextInternal(input, nullptr);
|
|
}
|
|
|
|
std::wstring shapeArabicText(const std::wstring& input, int logicalCursorPos, int* visualCursorPos)
|
|
{
|
|
std::vector<int> ltv(input.size() + 1, 0);
|
|
std::wstring result = shapeArabicTextInternal(input, <v);
|
|
|
|
if (visualCursorPos)
|
|
{
|
|
int clamped = logicalCursorPos;
|
|
if (clamped < 0) clamped = 0;
|
|
if (clamped > (int)input.size()) clamped = (int)input.size();
|
|
*visualCursorPos = ltv[clamped];
|
|
}
|
|
|
|
return result;
|
|
}
|