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neovim/src/nvim/arabic.c
zeertzjq 711635872d vim-patch:8.1.1085: compiler warning for possibly uninitialized variable 
Problem:    Compiler warning for possibly uninitialized variable. (Tony
            Mechelynck)
Solution:   Make conditions more logical.
bd9bf266fc
2022-08-25 12:53:34 +08:00

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C
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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
/// @file arabic.c
///
/// Functions for Arabic language.
///
/// Author: Nadim Shaikli & Isam Bayazidi
/// Farsi support and restructuring to make adding new letters easier by Ali
/// Gholami Rudi. Further work by Ameretat Reith.
/// Sorted list of unicode Arabic characters. Each entry holds the
/// presentation forms of a letter.
///
/// Arabic characters are categorized into following types:
///
/// Isolated - iso-8859-6 form char denoted with a_*
/// Initial - unicode form-B start char denoted with a_i_*
/// Medial - unicode form-B middle char denoted with a_m_*
/// Final - unicode form-B final char denoted with a_f_*
/// Stand-Alone - unicode form-B isolated char denoted with a_s_* (NOT USED)
#include <stdbool.h>
#include "nvim/arabic.h"
#include "nvim/ascii.h"
#include "nvim/vim.h"
// Unicode values for Arabic characters.
#define a_HAMZA 0x0621
#define a_ALEF_MADDA 0x0622
#define a_ALEF_HAMZA_ABOVE 0x0623
#define a_WAW_HAMZA 0x0624
#define a_ALEF_HAMZA_BELOW 0x0625
#define a_YEH_HAMZA 0x0626
#define a_ALEF 0x0627
#define a_BEH 0x0628
#define a_TEH_MARBUTA 0x0629
#define a_TEH 0x062a
#define a_THEH 0x062b
#define a_JEEM 0x062c
#define a_HAH 0x062d
#define a_KHAH 0x062e
#define a_DAL 0x062f
#define a_THAL 0x0630
#define a_REH 0x0631
#define a_ZAIN 0x0632
#define a_SEEN 0x0633
#define a_SHEEN 0x0634
#define a_SAD 0x0635
#define a_DAD 0x0636
#define a_TAH 0x0637
#define a_ZAH 0x0638
#define a_AIN 0x0639
#define a_GHAIN 0x063a
#define a_TATWEEL 0x0640
#define a_FEH 0x0641
#define a_QAF 0x0642
#define a_KAF 0x0643
#define a_LAM 0x0644
#define a_MEEM 0x0645
#define a_NOON 0x0646
#define a_HEH 0x0647
#define a_WAW 0x0648
#define a_ALEF_MAKSURA 0x0649
#define a_YEH 0x064a
#define a_FATHATAN 0x064b
#define a_DAMMATAN 0x064c
#define a_KASRATAN 0x064d
#define a_FATHA 0x064e
#define a_DAMMA 0x064f
#define a_KASRA 0x0650
#define a_SHADDA 0x0651
#define a_SUKUN 0x0652
#define a_MADDA_ABOVE 0x0653
#define a_HAMZA_ABOVE 0x0654
#define a_HAMZA_BELOW 0x0655
#define a_PEH 0x067e
#define a_TCHEH 0x0686
#define a_JEH 0x0698
#define a_FKAF 0x06a9
#define a_GAF 0x06af
#define a_FYEH 0x06cc
#define a_s_LAM_ALEF_MADDA_ABOVE 0xfef5
#define a_f_LAM_ALEF_MADDA_ABOVE 0xfef6
#define a_s_LAM_ALEF_HAMZA_ABOVE 0xfef7
#define a_f_LAM_ALEF_HAMZA_ABOVE 0xfef8
#define a_s_LAM_ALEF_HAMZA_BELOW 0xfef9
#define a_f_LAM_ALEF_HAMZA_BELOW 0xfefa
#define a_s_LAM_ALEF 0xfefb
#define a_f_LAM_ALEF 0xfefc
static struct achar {
unsigned c;
unsigned isolated;
unsigned initial;
unsigned medial;
unsigned final;
} achars[] = {
{ a_HAMZA, 0xfe80, 0, 0, 0 },
{ a_ALEF_MADDA, 0xfe81, 0, 0, 0xfe82 },
{ a_ALEF_HAMZA_ABOVE, 0xfe83, 0, 0, 0xfe84 },
{ a_WAW_HAMZA, 0xfe85, 0, 0, 0xfe86 },
{ a_ALEF_HAMZA_BELOW, 0xfe87, 0, 0, 0xfe88 },
{ a_YEH_HAMZA, 0xfe89, 0xfe8b, 0xfe8c, 0xfe8a },
{ a_ALEF, 0xfe8d, 0, 0, 0xfe8e },
{ a_BEH, 0xfe8f, 0xfe91, 0xfe92, 0xfe90 },
{ a_TEH_MARBUTA, 0xfe93, 0, 0, 0xfe94 },
{ a_TEH, 0xfe95, 0xfe97, 0xfe98, 0xfe96 },
{ a_THEH, 0xfe99, 0xfe9b, 0xfe9c, 0xfe9a },
{ a_JEEM, 0xfe9d, 0xfe9f, 0xfea0, 0xfe9e },
{ a_HAH, 0xfea1, 0xfea3, 0xfea4, 0xfea2 },
{ a_KHAH, 0xfea5, 0xfea7, 0xfea8, 0xfea6 },
{ a_DAL, 0xfea9, 0, 0, 0xfeaa },
{ a_THAL, 0xfeab, 0, 0, 0xfeac },
{ a_REH, 0xfead, 0, 0, 0xfeae },
{ a_ZAIN, 0xfeaf, 0, 0, 0xfeb0 },
{ a_SEEN, 0xfeb1, 0xfeb3, 0xfeb4, 0xfeb2 },
{ a_SHEEN, 0xfeb5, 0xfeb7, 0xfeb8, 0xfeb6 },
{ a_SAD, 0xfeb9, 0xfebb, 0xfebc, 0xfeba },
{ a_DAD, 0xfebd, 0xfebf, 0xfec0, 0xfebe },
{ a_TAH, 0xfec1, 0xfec3, 0xfec4, 0xfec2 },
{ a_ZAH, 0xfec5, 0xfec7, 0xfec8, 0xfec6 },
{ a_AIN, 0xfec9, 0xfecb, 0xfecc, 0xfeca },
{ a_GHAIN, 0xfecd, 0xfecf, 0xfed0, 0xfece },
{ a_TATWEEL, 0, 0x0640, 0x0640, 0x0640 },
{ a_FEH, 0xfed1, 0xfed3, 0xfed4, 0xfed2 },
{ a_QAF, 0xfed5, 0xfed7, 0xfed8, 0xfed6 },
{ a_KAF, 0xfed9, 0xfedb, 0xfedc, 0xfeda },
{ a_LAM, 0xfedd, 0xfedf, 0xfee0, 0xfede },
{ a_MEEM, 0xfee1, 0xfee3, 0xfee4, 0xfee2 },
{ a_NOON, 0xfee5, 0xfee7, 0xfee8, 0xfee6 },
{ a_HEH, 0xfee9, 0xfeeb, 0xfeec, 0xfeea },
{ a_WAW, 0xfeed, 0, 0, 0xfeee },
{ a_ALEF_MAKSURA, 0xfeef, 0, 0, 0xfef0 },
{ a_YEH, 0xfef1, 0xfef3, 0xfef4, 0xfef2 },
{ a_FATHATAN, 0xfe70, 0, 0, 0 },
{ a_DAMMATAN, 0xfe72, 0, 0, 0 },
{ a_KASRATAN, 0xfe74, 0, 0, 0 },
{ a_FATHA, 0xfe76, 0, 0xfe77, 0 },
{ a_DAMMA, 0xfe78, 0, 0xfe79, 0 },
{ a_KASRA, 0xfe7a, 0, 0xfe7b, 0 },
{ a_SHADDA, 0xfe7c, 0, 0xfe7c, 0 },
{ a_SUKUN, 0xfe7e, 0, 0xfe7f, 0 },
{ a_MADDA_ABOVE, 0, 0, 0, 0 },
{ a_HAMZA_ABOVE, 0, 0, 0, 0 },
{ a_HAMZA_BELOW, 0, 0, 0, 0 },
{ a_PEH, 0xfb56, 0xfb58, 0xfb59, 0xfb57 },
{ a_TCHEH, 0xfb7a, 0xfb7c, 0xfb7d, 0xfb7b },
{ a_JEH, 0xfb8a, 0, 0, 0xfb8b },
{ a_FKAF, 0xfb8e, 0xfb90, 0xfb91, 0xfb8f },
{ a_GAF, 0xfb92, 0xfb94, 0xfb95, 0xfb93 },
{ a_FYEH, 0xfbfc, 0xfbfe, 0xfbff, 0xfbfd },
};
#define a_BYTE_ORDER_MARK 0xfeff
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "arabic.c.generated.h"
#endif
/// Find the struct achar pointer to the given Arabic char.
/// Returns NULL if not found.
static struct achar *find_achar(int c)
{
// using binary search to find c
int h = ARRAY_SIZE(achars);
int l = 0;
while (l < h) {
int m = (h + l) / 2;
if (achars[m].c == (unsigned)c) {
return &achars[m];
}
if ((unsigned)c < achars[m].c) {
h = m;
} else {
l = m + 1;
}
}
return NULL;
}
/// Change shape - from Combination (2 char) to an Isolated
static int chg_c_laa2i(int hid_c)
{
int tempc;
switch (hid_c) {
case a_ALEF_MADDA:
tempc = a_s_LAM_ALEF_MADDA_ABOVE;
break;
case a_ALEF_HAMZA_ABOVE:
tempc = a_s_LAM_ALEF_HAMZA_ABOVE;
break;
case a_ALEF_HAMZA_BELOW:
tempc = a_s_LAM_ALEF_HAMZA_BELOW;
break;
case a_ALEF:
tempc = a_s_LAM_ALEF;
break;
default:
tempc = 0;
}
return tempc;
}
/// Change shape - from Combination-Isolated to Final
static int chg_c_laa2f(int hid_c)
{
int tempc;
switch (hid_c) {
case a_ALEF_MADDA:
tempc = a_f_LAM_ALEF_MADDA_ABOVE;
break;
case a_ALEF_HAMZA_ABOVE:
tempc = a_f_LAM_ALEF_HAMZA_ABOVE;
break;
case a_ALEF_HAMZA_BELOW:
tempc = a_f_LAM_ALEF_HAMZA_BELOW;
break;
case a_ALEF:
tempc = a_f_LAM_ALEF;
break;
default:
tempc = 0;
}
return tempc;
}
/// Returns whether it is possible to join the given letters
static int can_join(int c1, int c2)
{
struct achar *a1 = find_achar(c1);
struct achar *a2 = find_achar(c2);
return a1 && a2 && (a1->initial || a1->medial) && (a2->final || a2->medial);
}
/// Check whether we are dealing with a character that could be regarded as an
/// Arabic combining character, need to check the character before this.
bool arabic_maycombine(int two)
FUNC_ATTR_PURE
{
if (p_arshape && !p_tbidi) {
return two == a_ALEF_MADDA
|| two == a_ALEF_HAMZA_ABOVE
|| two == a_ALEF_HAMZA_BELOW
|| two == a_ALEF;
}
return false;
}
/// Check whether we are dealing with Arabic combining characters.
/// Note: these are NOT really composing characters!
///
/// @param one First character.
/// @param two Character just after "one".
bool arabic_combine(int one, int two)
FUNC_ATTR_PURE
{
if (one == a_LAM) {
return arabic_maycombine(two);
}
return false;
}
/// A_is_iso returns true if 'c' is an Arabic ISO-8859-6 character
/// (alphabet/number/punctuation)
static int A_is_iso(int c)
{
return find_achar(c) != NULL;
}
/// A_is_ok returns true if 'c' is an Arabic 10646 (8859-6 or Form-B)
static int A_is_ok(int c)
{
return (A_is_iso(c) || c == a_BYTE_ORDER_MARK);
}
/// A_is_valid returns true if 'c' is an Arabic 10646 (8859-6 or Form-B)
/// with some exceptions/exclusions
static int A_is_valid(int c)
{
return (A_is_ok(c) && c != a_HAMZA);
}
// Do Arabic shaping on character "c". Returns the shaped character.
// out: "ccp" points to the first byte of the character to be shaped.
// in/out: "c1p" points to the first composing char for "c".
// in: "prev_c" is the previous character (not shaped)
// in: "prev_c1" is the first composing char for the previous char
// (not shaped)
// in: "next_c" is the next character (not shaped).
int arabic_shape(int c, int *ccp, int *c1p, int prev_c, int prev_c1, int next_c)
{
// Deal only with Arabic character, pass back all others
if (!A_is_ok(c)) {
return c;
}
int curr_c;
int curr_laa = arabic_combine(c, *c1p);
int prev_laa = arabic_combine(prev_c, prev_c1);
if (curr_laa) {
if (A_is_valid(prev_c) && can_join(prev_c, a_LAM) && !prev_laa) {
curr_c = chg_c_laa2f(*c1p);
} else {
curr_c = chg_c_laa2i(*c1p);
}
// Remove the composing character
*c1p = 0;
} else {
struct achar *curr_a = find_achar(c);
int backward_combine = !prev_laa && can_join(prev_c, c);
int forward_combine = can_join(c, next_c);
if (backward_combine) {
if (forward_combine) {
curr_c = (int)curr_a->medial;
} else {
curr_c = (int)curr_a->final;
}
} else {
if (forward_combine) {
curr_c = (int)curr_a->initial;
} else {
curr_c = (int)curr_a->isolated;
}
}
}
// Character missing from the table means using original character.
if (curr_c == NUL) {
curr_c = c;
}
if ((curr_c != c) && (ccp != NULL)) {
char buf[MB_MAXBYTES + 1];
// Update the first byte of the character
utf_char2bytes(curr_c, buf);
*ccp = (uint8_t)buf[0];
}
// Return the shaped character
return curr_c;
}
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