1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
{-------------------------------------------------------------------------------
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
the specific language governing rights and limitations under the License.
Alternatively, the contents of this file may be used under the terms of the
GNU General Public License Version 2 or later (the "GPL"), in which case
the provisions of the GPL are applicable instead of those above.
If you wish to allow use of your version of this file only under the terms
of the GPL and not to allow others to use your version of this file
under the MPL, indicate your decision by deleting the provisions above and
replace them with the notice and other provisions required by the GPL.
If you do not delete the provisions above, a recipient may use your version
of this file under either the MPL or the GPL.
-------------------------------------------------------------------------------}
(*
visit the following URL for more information
http://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt
http://unicode.org/reports/tr11/
*)
unit SynEditTextBidiChars;
{$I synedit.inc}
interface
uses
Classes, SysUtils, LazSynEditText;
type
{ TSynEditStringBidiChars }
TSynEditStringBidiChars = class(TSynEditStringsLinked)
protected
procedure DoGetPhysicalCharWidths(Line: PChar; LineLen, Index: Integer; PWidths: PPhysicalCharWidth); override;
end;
implementation
{ TSynEditStringBidiChars }
procedure TSynEditStringBidiChars.DoGetPhysicalCharWidths(Line: PChar;
LineLen, Index: Integer; PWidths: PPhysicalCharWidth);
var
i: Integer;
lbidi, bidi: (bLtr, bRtl, bWeak);
WeakStart: PPhysicalCharWidth;
begin
inherited DoGetPhysicalCharWidths(Line, LineLen, Index, PWidths);
if not IsUtf8 then
exit;
dec(Line);
dec(PWidths);
lbidi := bLtr;
WeakStart := nil;
for i := 0 to LineLen - 1 do begin
inc(Line);
inc(PWidths);
if PWidths^ = 0 then continue;
bidi := bLtr;
case Line^ of
#$09, //Segment_Separator
#$20, // White_Space
#$21..#$22, #$26..#$2A, // Other_Neutral
#$2B, #$2D, // EN (European Seperator)
#$23..#$25, // European Terminator
#$2C, #$2E, #$3A, // Common Separator
#$3B..#$40, #$5B..#$60, #$7B..#$7E // Other_Neutral
:
bidi := bWeak;
#$30..#$39:
bidi := bWeak; // EN (European Number)
#$C2: case Line[1] of
#$B2..#$B3, #$B9:
bidi := bWeak; // EN (European Seperator)
end;
#$D6:
if (Line[1] >= #$90) then bidi := bRtl;
#$D7..#$DA, #$DC..#$df:
bidi := bRtl;
#$DB: case Line[1] of
#$B0..#$B9:
bidi := bWeak; // EN (European Seperator)
else
bidi := bRtl;
end;
#$E0:
if (Line[1] <= #$A2) then bidi := bRtl
else
if (Line[1] = #$A3) and (Line[2] <= #$BF) then bidi := bRtl;
#$E2: case Line[1] of
#$81: if (Line[2] in [#$B0, #$B4..#$B9]) then bidi := bWeak; // EN (European Seperator)
#$82: if (Line[2] in [#$80..#$89]) then bidi := bWeak; // EN (European Seperator)
#$92: if (Line[2] in [#$88..#$9B]) then bidi := bWeak; // EN (European Seperator)
end;
#$EF: case Line[1] of
#$AC: if (Line[2] >= #$9D) then bidi := bRtl;
#$AD..#$B6: bidi := bRtl;
#$B7: if (Line[2] in [#$80..#$8F, #$B0..#$bF]) then bidi := bRtl;
#$B9: if (Line[2] >= #$B0) then bidi := bRtl;
#$BA: bidi := bRtl;
#$BB: if (Line[2] <= #$BF) then bidi := bRtl;
#$BC: if (Line[2] in [#$90..#$99]) then bidi := bWeak; // EN (European Seperator)
end;
#$F0: case Line[1] of
#$90: if (Line[2] >= #$A0) then bidi := bRtl;
#$91..#$9C, #$9E: bidi := bRtl;
#$9D: if (Line[2] = #$9F) and (Line[3] >= #$8E)
then bidi := bWeak // EN (European Seperator)
else bidi := bRtl;
#$9F: if (Line[2] = #$84) and (Line[3] <= #$8A) then bidi := bWeak; // EN (European Seperator)
end;
end;
case bidi of
bRtl: begin
PWidths^ := PWidths^ or PCWFlagRTL;
lbidi := bRtl;
WeakStart := nil;
end;
bLtr: begin
if (WeakStart <> nil) and (lbidi = bRtl) then begin
while WeakStart < PWidths do begin
WeakStart^ := WeakStart^ and (not PCWFlagRTL);
inc(WeakStart);
end;
end;
lbidi := bLtr;
WeakStart := nil;
end;
bWeak: begin
if WeakStart = nil then WeakStart := PWidths;
if lbidi = bRtl then
PWidths^ := PWidths^ or PCWFlagRTL;
end;
end;
end;
if (WeakStart <> nil) and (lbidi = bRtl) then begin
while WeakStart <= PWidths do begin
WeakStart^ := WeakStart^ and (not PCWFlagRTL);
inc(WeakStart);
end;
end;
end;
(*
RTL strong
200F (e2808f) ; R # Cf (c38f) RIGHT-TO-LEFT MARK
0590 (d690) - 08FF (e0a3bf)
FB1D (efac9d) - FDCF (efb78f)
FDF0 (efb7b0) - FDFF (efb7bf)
FE70 (efb9b0) - FEFF (efbbbf)
00010800 (f090a080) - 0001EFFF (f09ebfbf)
TODO WEAK
EN (European Seperator)
European Terminator
*)
end.
|
