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annotate src/arabic.c @ 18478:94223687df0e

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Added tag v8.1.2233 for changeset e93cab5d0f0f27fad7882f1f412927df055b090d
author Bram Moolenaar <Bram@vim.org>
date Tue, 29 Oct 2019 04:30:05 +0100
parents 061cf939f7ce
children 7334bf933510
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1 /* vi:set ts=8 sts=4 sw=4 noet:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 * See README.txt for an overview of the Vim source code.
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8 */
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9
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10 /*
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11 * arabic.c: functions for Arabic language
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12 *
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13 * Author: Nadim Shaikli & Isam Bayazidi
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14 * Farsi support and restructuring to make adding new letters easier by Ali
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15 * Gholami Rudi. Further work by Ameretat Reith.
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16 */
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17
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18 /*
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19 * Sorted list of unicode Arabic characters. Each entry holds the
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20 * presentation forms of a letter.
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21 *
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22 * Arabic characters are categorized into following types:
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23 *
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24 * Isolated - iso-8859-6 form
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25 * Initial - unicode form-B start
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26 * Medial - unicode form-B middle
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27 * Final - unicode form-B final
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28 * Stand-Alone - unicode form-B isolated
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29 */
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30
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31 #include "vim.h"
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9b048dced116 commit https://github.com/vim/vim/commit/75464dc434c43efac60e8bfd9bec2a8b736407e9
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33 #if defined(FEAT_ARABIC) || defined(PROTO)
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34
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35 // Unicode values for Arabic characters.
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36 #define a_HAMZA 0x0621
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37 #define a_ALEF_MADDA 0x0622
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38 #define a_ALEF_HAMZA_ABOVE 0x0623
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39 #define a_WAW_HAMZA 0x0624
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40 #define a_ALEF_HAMZA_BELOW 0x0625
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41 #define a_YEH_HAMZA 0x0626
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42 #define a_ALEF 0x0627
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43 #define a_BEH 0x0628
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44 #define a_TEH_MARBUTA 0x0629
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45 #define a_TEH 0x062a
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46 #define a_THEH 0x062b
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47 #define a_JEEM 0x062c
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48 #define a_HAH 0x062d
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49 #define a_KHAH 0x062e
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50 #define a_DAL 0x062f
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51 #define a_THAL 0x0630
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52 #define a_REH 0x0631
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53 #define a_ZAIN 0x0632
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54 #define a_SEEN 0x0633
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55 #define a_SHEEN 0x0634
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56 #define a_SAD 0x0635
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57 #define a_DAD 0x0636
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58 #define a_TAH 0x0637
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59 #define a_ZAH 0x0638
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60 #define a_AIN 0x0639
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61 #define a_GHAIN 0x063a
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62 #define a_TATWEEL 0x0640
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63 #define a_FEH 0x0641
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64 #define a_QAF 0x0642
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65 #define a_KAF 0x0643
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66 #define a_LAM 0x0644
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67 #define a_MEEM 0x0645
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68 #define a_NOON 0x0646
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69 #define a_HEH 0x0647
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70 #define a_WAW 0x0648
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71 #define a_ALEF_MAKSURA 0x0649
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72 #define a_YEH 0x064a
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73 #define a_FATHATAN 0x064b
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74 #define a_DAMMATAN 0x064c
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75 #define a_KASRATAN 0x064d
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76 #define a_FATHA 0x064e
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77 #define a_DAMMA 0x064f
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78 #define a_KASRA 0x0650
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79 #define a_SHADDA 0x0651
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80 #define a_SUKUN 0x0652
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81 #define a_MADDA_ABOVE 0x0653
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82 #define a_HAMZA_ABOVE 0x0654
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83 #define a_HAMZA_BELOW 0x0655
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84
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85 #define a_PEH 0x067e
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86 #define a_TCHEH 0x0686
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87 #define a_JEH 0x0698
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88 #define a_FKAF 0x06a9
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89 #define a_GAF 0x06af
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90 #define a_FYEH 0x06cc
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91
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92 #define a_s_LAM_ALEF_MADDA_ABOVE 0xfef5
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93 #define a_f_LAM_ALEF_MADDA_ABOVE 0xfef6
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94 #define a_s_LAM_ALEF_HAMZA_ABOVE 0xfef7
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95 #define a_f_LAM_ALEF_HAMZA_ABOVE 0xfef8
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96 #define a_s_LAM_ALEF_HAMZA_BELOW 0xfef9
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97 #define a_f_LAM_ALEF_HAMZA_BELOW 0xfefa
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98 #define a_s_LAM_ALEF 0xfefb
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99 #define a_f_LAM_ALEF 0xfefc
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100
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101 static struct achar {
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102 unsigned c;
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103 unsigned isolated;
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104 unsigned initial;
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105 unsigned medial;
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106 unsigned final;
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107 } achars[] = {
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108 {a_HAMZA, 0xfe80, 0, 0, 0},
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109 {a_ALEF_MADDA, 0xfe81, 0, 0, 0xfe82},
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110 {a_ALEF_HAMZA_ABOVE, 0xfe83, 0, 0, 0xfe84},
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111 {a_WAW_HAMZA, 0xfe85, 0, 0, 0xfe86},
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112 {a_ALEF_HAMZA_BELOW, 0xfe87, 0, 0, 0xfe88},
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113 {a_YEH_HAMZA, 0xfe89, 0xfe8b, 0xfe8c, 0xfe8a},
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114 {a_ALEF, 0xfe8d, 0, 0, 0xfe8e},
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115 {a_BEH, 0xfe8f, 0xfe91, 0xfe92, 0xfe90},
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116 {a_TEH_MARBUTA, 0xfe93, 0, 0, 0xfe94},
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117 {a_TEH, 0xfe95, 0xfe97, 0xfe98, 0xfe96},
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118 {a_THEH, 0xfe99, 0xfe9b, 0xfe9c, 0xfe9a},
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119 {a_JEEM, 0xfe9d, 0xfe9f, 0xfea0, 0xfe9e},
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120 {a_HAH, 0xfea1, 0xfea3, 0xfea4, 0xfea2},
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121 {a_KHAH, 0xfea5, 0xfea7, 0xfea8, 0xfea6},
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122 {a_DAL, 0xfea9, 0, 0, 0xfeaa},
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123 {a_THAL, 0xfeab, 0, 0, 0xfeac},
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124 {a_REH, 0xfead, 0, 0, 0xfeae},
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125 {a_ZAIN, 0xfeaf, 0, 0, 0xfeb0},
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126 {a_SEEN, 0xfeb1, 0xfeb3, 0xfeb4, 0xfeb2},
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127 {a_SHEEN, 0xfeb5, 0xfeb7, 0xfeb8, 0xfeb6},
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128 {a_SAD, 0xfeb9, 0xfebb, 0xfebc, 0xfeba},
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129 {a_DAD, 0xfebd, 0xfebf, 0xfec0, 0xfebe},
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130 {a_TAH, 0xfec1, 0xfec3, 0xfec4, 0xfec2},
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diff changeset
131 {a_ZAH, 0xfec5, 0xfec7, 0xfec8, 0xfec6},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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132 {a_AIN, 0xfec9, 0xfecb, 0xfecc, 0xfeca},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
133 {a_GHAIN, 0xfecd, 0xfecf, 0xfed0, 0xfece},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
134 {a_TATWEEL, 0, 0x0640, 0x0640, 0x0640},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
135 {a_FEH, 0xfed1, 0xfed3, 0xfed4, 0xfed2},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
136 {a_QAF, 0xfed5, 0xfed7, 0xfed8, 0xfed6},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
137 {a_KAF, 0xfed9, 0xfedb, 0xfedc, 0xfeda},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
138 {a_LAM, 0xfedd, 0xfedf, 0xfee0, 0xfede},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
139 {a_MEEM, 0xfee1, 0xfee3, 0xfee4, 0xfee2},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
140 {a_NOON, 0xfee5, 0xfee7, 0xfee8, 0xfee6},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
141 {a_HEH, 0xfee9, 0xfeeb, 0xfeec, 0xfeea},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
142 {a_WAW, 0xfeed, 0, 0, 0xfeee},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
143 {a_ALEF_MAKSURA, 0xfeef, 0, 0, 0xfef0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
144 {a_YEH, 0xfef1, 0xfef3, 0xfef4, 0xfef2},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
145 {a_FATHATAN, 0xfe70, 0, 0, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
146 {a_DAMMATAN, 0xfe72, 0, 0, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
147 {a_KASRATAN, 0xfe74, 0, 0, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
148 {a_FATHA, 0xfe76, 0, 0xfe77, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
149 {a_DAMMA, 0xfe78, 0, 0xfe79, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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150 {a_KASRA, 0xfe7a, 0, 0xfe7b, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
151 {a_SHADDA, 0xfe7c, 0, 0xfe7c, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
152 {a_SUKUN, 0xfe7e, 0, 0xfe7f, 0},
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diff changeset
153 {a_MADDA_ABOVE, 0, 0, 0, 0},
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154 {a_HAMZA_ABOVE, 0, 0, 0, 0},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
155 {a_HAMZA_BELOW, 0, 0, 0, 0},
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diff changeset
156 {a_PEH, 0xfb56, 0xfb58, 0xfb59, 0xfb57},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
157 {a_TCHEH, 0xfb7a, 0xfb7c, 0xfb7d, 0xfb7b},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
158 {a_JEH, 0xfb8a, 0, 0, 0xfb8b},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
159 {a_FKAF, 0xfb8e, 0xfb90, 0xfb91, 0xfb8f},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
160 {a_GAF, 0xfb92, 0xfb94, 0xfb95, 0xfb93},
473fbdb2717c patch 8.1.1038: Arabic support excludes Farsi
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diff changeset
161 {a_FYEH, 0xfbfc, 0xfbfe, 0xfbff, 0xfbfd},
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162 };
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163
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164 #define a_BYTE_ORDER_MARK 0xfeff
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165
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166 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
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167
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168 /*
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169 * Find the struct achar pointer to the given Arabic char.
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170 * Returns NULL if not found.
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171 */
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172 static struct achar *
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173 find_achar(int c)
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174 {
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175 int h, m, l;
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176
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177 // using binary search to find c
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178 h = ARRAY_SIZE(achars);
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179 l = 0;
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180 while (l < h)
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181 {
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182 m = (h + l) / 2;
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183 if (achars[m].c == (unsigned)c)
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184 return &achars[m];
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185 if ((unsigned)c < achars[m].c)
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186 h = m;
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187 else
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188 l = m + 1;
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189 }
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190 return NULL;
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191 }
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192
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193 /*
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194 * Change shape - from Combination (2 char) to an Isolated
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195 */
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196 static int
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197 chg_c_laa2i(int hid_c)
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198 {
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199 int tempc;
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200
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201 switch (hid_c)
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202 {
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203 case a_ALEF_MADDA:
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204 tempc = a_s_LAM_ALEF_MADDA_ABOVE;
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205 break;
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206 case a_ALEF_HAMZA_ABOVE:
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207 tempc = a_s_LAM_ALEF_HAMZA_ABOVE;
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208 break;
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209 case a_ALEF_HAMZA_BELOW:
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210 tempc = a_s_LAM_ALEF_HAMZA_BELOW;
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211 break;
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212 case a_ALEF:
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213 tempc = a_s_LAM_ALEF;
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214 break;
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215 default:
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216 tempc = 0;
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217 }
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218
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219 return tempc;
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220 }
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221
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222 /*
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223 * Change shape - from Combination-Isolated to Final
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224 */
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225 static int
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226 chg_c_laa2f(int hid_c)
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227 {
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228 int tempc;
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229
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230 switch (hid_c)
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231 {
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232 case a_ALEF_MADDA:
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233 tempc = a_f_LAM_ALEF_MADDA_ABOVE;
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234 break;
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235 case a_ALEF_HAMZA_ABOVE:
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236 tempc = a_f_LAM_ALEF_HAMZA_ABOVE;
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237 break;
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238 case a_ALEF_HAMZA_BELOW:
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239 tempc = a_f_LAM_ALEF_HAMZA_BELOW;
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240 break;
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241 case a_ALEF:
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242 tempc = a_f_LAM_ALEF;
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243 break;
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244 default:
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245 tempc = 0;
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246 }
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247
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248 return tempc;
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249 }
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250
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251 /*
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252 * Returns whether it is possible to join the given letters
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253 */
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254 static int
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255 can_join(int c1, int c2)
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diff changeset
256 {
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257 struct achar *a1 = find_achar(c1);
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258 struct achar *a2 = find_achar(c2);
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259
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260 return a1 && a2 && (a1->initial || a1->medial) && (a2->final || a2->medial);
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261 }
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262
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263 /*
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264 * Check whether we are dealing with a character that could be regarded as an
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265 * Arabic combining character, need to check the character before this.
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266 */
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267 int
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268 arabic_maycombine(int two)
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269 {
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270 if (p_arshape && !p_tbidi)
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271 return (two == a_ALEF_MADDA
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272 || two == a_ALEF_HAMZA_ABOVE
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273 || two == a_ALEF_HAMZA_BELOW
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274 || two == a_ALEF);
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275 return FALSE;
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276 }
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277
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278 /*
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279 * Check whether we are dealing with Arabic combining characters.
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280 * Note: these are NOT really composing characters!
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281 */
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282 int
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283 arabic_combine(
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284 int one, // first character
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285 int two) // character just after "one"
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286 {
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287 if (one == a_LAM)
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288 return arabic_maycombine(two);
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289 return FALSE;
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290 }
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291
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292 /*
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293 * A_is_iso returns true if 'c' is an Arabic ISO-8859-6 character
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294 * (alphabet/number/punctuation)
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295 */
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296 static int
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297 A_is_iso(int c)
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298 {
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299 return find_achar(c) != NULL;
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300 }
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301
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302 /*
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303 * A_is_ok returns true if 'c' is an Arabic 10646 (8859-6 or Form-B)
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304 */
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305 static int
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306 A_is_ok(int c)
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307 {
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308 return (A_is_iso(c) || c == a_BYTE_ORDER_MARK);
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309 }
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310
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311 /*
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312 * A_is_valid returns true if 'c' is an Arabic 10646 (8859-6 or Form-B)
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313 * with some exceptions/exclusions
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314 */
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315 static int
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316 A_is_valid(int c)
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317 {
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318 return (A_is_ok(c) && c != a_HAMZA);
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319 }
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320
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321 /*
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322 * Do Arabic shaping on character "c". Returns the shaped character.
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323 * out: "ccp" points to the first byte of the character to be shaped.
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324 * in/out: "c1p" points to the first composing char for "c".
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325 * in: "prev_c" is the previous character (not shaped)
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326 * in: "prev_c1" is the first composing char for the previous char
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327 * (not shaped)
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328 * in: "next_c" is the next character (not shaped).
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329 */
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330 int
7817
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331 arabic_shape(
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332 int c,
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333 int *ccp,
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334 int *c1p,
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335 int prev_c,
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336 int prev_c1,
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337 int next_c)
7
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338 {
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339 int curr_c;
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340 int curr_laa;
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341 int prev_laa;
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342
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343 // Deal only with Arabic characters, pass back all others
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344 if (!A_is_ok(c))
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345 return c;
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346
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347 curr_laa = arabic_combine(c, *c1p);
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348 prev_laa = arabic_combine(prev_c, prev_c1);
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349
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350 if (curr_laa)
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351 {
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352 if (A_is_valid(prev_c) && can_join(prev_c, a_LAM) && !prev_laa)
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353 curr_c = chg_c_laa2f(*c1p);
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354 else
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355 curr_c = chg_c_laa2i(*c1p);
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356
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357 // Remove the composing character
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358 *c1p = 0;
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359 }
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360 else
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361 {
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362 struct achar *curr_a = find_achar(c);
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363 int backward_combine = !prev_laa && can_join(prev_c, c);
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364 int forward_combine = can_join(c, next_c);
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365
16160
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366 if (backward_combine)
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367 {
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368 if (forward_combine)
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369 curr_c = curr_a->medial;
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370 else
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371 curr_c = curr_a->final;
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372 }
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373 else
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374 {
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375 if (forward_combine)
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376 curr_c = curr_a->initial;
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377 else
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378 curr_c = curr_a->isolated;
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379 }
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380 }
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diff changeset
381
16160
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382 // Character missing from the table means using original character.
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383 if (curr_c == NUL)
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384 curr_c = c;
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385
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386 if (curr_c != c && ccp != NULL)
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diff changeset
387 {
3549
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diff changeset
388 char_u buf[MB_MAXBYTES + 1];
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389
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390 // Update the first byte of the character.
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391 (*mb_char2bytes)(curr_c, buf);
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392 *ccp = buf[0];
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393 }
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394
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395 // Return the shaped character
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396 return curr_c;
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397 }
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398 #endif // FEAT_ARABIC