[vte/wip/egmont/bidi: 6/6] unsorted

From: Egmont Koblinger <egmontkob src gnome org>
To: commits-list gnome org
Cc:
Subject: [vte/wip/egmont/bidi: 6/6] unsorted
Date: Sat, 1 Jun 2019 14:05:05 +0000 (UTC)
commit 0bd35bc0e21bf510c673b5095dc2df3f1b8d8408
Author: Egmont Koblinger <egmont gmail com>
Date:   Fri Aug 17 18:43:19 2018 +0200

    unsorted

 BIDI-STATUS           |  63 +++++++++++++
 doc/bidi.txt          | 257 ++++++++++++++++++++++++++++++++++++++++++++++++++
 src/vte/vteterminal.h |   2 +-
 3 files changed, 321 insertions(+), 1 deletion(-)
---
diff --git a/BIDI-STATUS b/BIDI-STATUS
new file mode 100644
index 00000000..4f9b665a
--- /dev/null
+++ b/BIDI-STATUS
@@ -0,0 +1,63 @@
+Done:
+- Implicit (level 1) and Explicit (a small subset only) modes (SM / RM 8).
+- Overall LTR or RTL direction (SCP 1 / 2 or SPD 0 / 3).
+- Possibility to autodetect paragraph direction (DECSET / DECRST 2501).
+- Possibility to make box drawing characters mirrorable (DECSET / DECRST 2500).
+- I-Beam cursor shows the character's resolved directionality when the
+  paragraph has a foreign directionality character.
+- Mouse highlighting, text copying (logical in normal modes, visual in
+  rectangle mode).
+- Mouse reporting.
+- Regex match and explicit hyperlink underlining on hover.
+- VTE_DEBUG=bidi highlights characters with resolved RTL directionality.
+- Arabic shaping using Unicode presentation forms.
+- Test file.
+- Configure flag.
+- Keyboard arrow swapping.
+
+Bugs:
+- The way the modes apply to paragraphs, and what happens when a paragraph
+  is split or two paragraphs are joined is just a first hack, needs to be
+  reviewed, adjusted, fixed properly.
+- SPD should also update all the onscreen lines – really?
+- Or should we drop SPD?
+
+Missing from first release:
+- The entire screen is always invalidated. Have some more fine grained
+  solution (see also vte #26).
+- Probably we'd need to make Erase in Display (Below or All) sequences turn
+  the previous line to hard wrapped, requiring to keep one more line in the
+  ring's writable area.
+- Code cleanup and review, of course.
+
+Planned future improvements:
+- Real shaping (harfbuzz?).
+- Right-align RTL glyphs.
+- Implicit mode level 2 (handling BiDi control characters).
+- Mirror the glyphs that don't have mirrored counterpart.
+- Play with other possibilities for placing the cursor (especially when it's
+  at the end of the logical line).
+- Play with better placement of the preedit box.
+- Remember some lines that are no longer user-accessible as they scroll out,
+  to properly BiDi the still remaining part of that paragraph.
+- Possibility for default RTL directionality?
+- API (for what exactly)?
+
+Not planned at all:
+- Operating on the presentation component (DCSM reset).
+- BiDi in explicit mode by transferring the embedding levels (SDS, SRS...).
+- Escape sequences that modify the emulation behavior (SIMD...).
+
+Useful aliases:
+  alias ltr='echo -ne "\e[1 k"'
+  alias rtl='echo -ne "\e[2 k"'
+  alias implicit='echo -ne "\e[8h"'
+  alias explicit='echo -ne "\e[8l"'
+  alias bidi='echo -ne "\e[8h"'    # same as implicit
+  alias nobidi='echo -ne "\e[8l"'  # same as explicit
+  alias box-mirror='echo -ne "\e[?2500h"'
+  alias box-normal='echo -ne "\e[?2500l"'
+  alias auto='echo -ne "\e[?2501h"'
+  alias noauto='echo -ne "\e[?2501l"'
+  alias kbdswap='echo -ne "\e[?1243h"'
+  alias nokbdswap='echo -ne "\e[?1243l"'
diff --git a/doc/bidi.txt b/doc/bidi.txt
new file mode 100644
index 00000000..a7c86cbc
--- /dev/null
+++ b/doc/bidi.txt
@@ -0,0 +1,257 @@
+                         ╔════════════════════════════╗
+═════════════════════════╣ BiDi test – for 80 columns ╠═════════════════════════
+                         ╚════════════════════════════╝
+
+Test cases are structured like this:
+
+[01mTitle (bold)[m
+Optional LTR explanation of the logical order (normal)
+[32mReference rendering using similarly looking LTR glyphs (green)[m
+[36mActual rendering, needs to match the reference rendering (cyan)[m
+
+All words, except for the explanation of the logical order wherever it’s
+deliberately reversed, should show up in human readable order.
+
+Some test cases are marked as “should look broken”. This means that the
+overall look is not what humans are looking for; still, the actual rendering
+needs to match the reference rendering.
+
+At Arabic shaping tests, runs of connected letters are denoted.
+
+At box tests the reference rendering is upside down, so you should get nice
+squares everywhere.
+
+                                ┌──────────────┐
+────────────────────────────────┤ Implicit LTR ├────────────────────────────────
+                                └──────────────┘
+[01mLTR + RTL[m
+[00mHello1 ⸤Hello23⸣ Hello456 Shlm1 ⸤Shlm23⸣ Shlm456[m
+[32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36mHello1 ⸤Hello23⸣ Hello456 שָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456[m
+
+[01mRTL + LTR[m
+[00mShlm1 ⸤Shlm23⸣ Shlm456 Hello1 ⸤Hello23⸣ Hello456[m
+[32m456oi7w ⸢23oi7w⸥ 1oi7w Hello1 ⸤Hello23⸣ Hello456[m
+[36mשָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456 Hello1 ⸤Hello23⸣ Hello456[m
+
+[01mParagraph wrapping at foreign word[m
+[32mLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor w[m
+[32moi7 incididunt ut labore et dolore magna aliqua.[m
+[36mLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor שָׁלוֹם incididunt ut 
labore et dolore magna aliqua.[m
+
+[01mDouble wide[m
+[32ma＜z  n＞x[m
+[36ma＜z  א＜ת[m
+
+[01mArabic shaping[m
+[32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36mالطرفية – استعمل سطر الأوامر[m
+
+[01mBox[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m
+[36m┗━┛   a╚═╝z  א┘─└ת   ╰─╯[m
+
+[01mBox in mirrored mode[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m[?2500h
+[36m┗━┛   a╚═╝z  א└─┘ת   ╰─╯[m[?2500l
+
+                                ┌──────────────┐
+────────────────────────────────┤ Implicit RTL ├────────────────────────────────
+                                └──────────────┘
+[01mLTR + RTL[m
+[00mHello1 ⸤Hello23⸣ Hello456 Shlm1 ⸤Shlm23⸣ Shlm456[m
+                                [32m456oi7w ⸢23oi7w⸥ 1oi7w Hello1 ⸤Hello23⸣ Hello456[m
+[36m[2 kHello1 ⸤Hello23⸣ Hello456 שָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456[1 k[m
+
+[01mRTL + LTR[m
+[00mShlm1 ⸤Shlm23⸣ Shlm456 Hello1 ⸤Hello23⸣ Hello456[m
+                                [32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36m[2 kשָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456 Hello1 ⸤Hello23⸣ Hello456[1 k[m
+
+[01mParagraph with wrong direction (should look broken)[m
+[32mw Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor[m
+                                [32m.incididunt ut labore et dolore magna aliqua oi7[m
+[36m[2 kLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor שָׁלוֹם incididunt 
ut labore et dolore magna aliqua.[1 k[m
+
+[01mDouble wide[m
+                                                                      [32ma＜z  n＞x[m
+[36m[2 kא＜ת  a＜z[1 k[m
+
+[01mArabic shaping[m
+                                                    [32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36m[2 kالطرفية – استعمل سطر الأوامر[1 k[m
+
+[01mOld Hungarian Rovásírás[m
+[00m(font at https://github.com/OldHungarian/old-hungarian-font)[m
+                                                         [32mΛᛩHTΛᛩMↄH ↄ4TH4Λↄ¤ᛝ +ΛↃ[m
+[36m[2 k𐲛𐳖𐳇 𐲏𐳪𐳙𐳍𐳀𐳢𐳐𐳀𐳙 𐲢𐳛𐳮𐳁𐳤𐳑𐳢𐳁𐳤[1 k[m
+
+[01mBox[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[2 k
+[36m┛━┗   א╝═╚ת  a└─┘z   ╯─╰[m[1 k
+
+[01mBox in mirrored mode[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[2 k[?2500h
+[36m┗━┛   א╚═╝ת  a└─┘z   ╰─╯[m[?2500l[1 k
+
+                        ┌──────────────────────────────┐
+────────────────────────┤ Implicit auto (LTR fallback) ├────────────────────────
+                        └──────────────────────────────┘
+[01mLTR + RTL[m
+[00mHello1 ⸤Hello23⸣ Hello456 Shlm1 ⸤Shlm23⸣ Shlm456[m
+[32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36m[?2501hHello1 ⸤Hello23⸣ Hello456 שָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456[?2501l[m
+
+[01mRTL + LTR[m
+[00mShlm1 ⸤Shlm23⸣ Shlm456 Hello1 ⸤Hello23⸣ Hello456[m
+                                [32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36m[?2501hשָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456 Hello1 ⸤Hello23⸣ Hello456[?2501l[m
+
+[01mParagraph wrapping at foreign word[m
+[32mLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor w[m
+[32moi7 incididunt ut labore et dolore magna aliqua.[m
+[36m[?2501hLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor שָׁלוֹם 
incididunt ut labore et dolore magna aliqua.[?2501l[m
+
+[01mArabic shaping[m
+                                                    [32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36m[?2501hالطرفية – استعمل سطر الأوامر[?2501l[m
+
+[01mBox[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m[?2501h
+[36m┗━┛   a╚═╝z  א┘─└ת   ╰─╯[m[?2501l
+
+[01mBox in mirrored mode[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m[?2501h[?2500h
+[36m┗━┛   a╚═╝z  א└─┘ת   ╰─╯[m[?2500l[?2501l
+
+                        ┌──────────────────────────────┐
+────────────────────────┤ Implicit auto (RTL fallback) ├────────────────────────
+                        └──────────────────────────────┘
+[01mLTR + RTL[m
+[00mHello1 ⸤Hello23⸣ Hello456 Shlm1 ⸤Shlm23⸣ Shlm456[m
+[32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36m[2 k[?2501hHello1 ⸤Hello23⸣ Hello456 שָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456[?2501l[1 k[m
+
+[01mRTL + LTR[m
+[00mShlm1 ⸤Shlm23⸣ Shlm456 Hello1 ⸤Hello23⸣ Hello456[m
+                                [32mHello1 ⸤Hello23⸣ Hello456 456oi7w ⸢23oi7w⸥ 1oi7w[m
+[36m[2 k[?2501hשָׁלוֹם1 ⸤שָׁלוֹם23⸣ שָׁלוֹם456 Hello1 ⸤Hello23⸣ Hello456[?2501l[1 k[m
+
+[01mParagraph wrapping at foreign word[m
+[32mLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor w[m
+[32moi7 incididunt ut labore et dolore magna aliqua.[m
+[36m[2 k[?2501hLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor שָׁלוֹם 
incididunt ut labore et dolore magna aliqua.[?2501l[1 k[m
+
+[01mArabic shaping[m
+                                                    [32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36m[2 k[?2501hالطرفية – استعمل سطر الأوامر[?2501l[1 k[m
+
+[01mBox[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[2 k[?2501h
+[36m┛━┗   א╝═╚ת  a└─┘z   ╯─╰[m[?2501l[1 k
+
+[01mBox in mirrored mode[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[2 k[?2501h[?2500h
+[36m┗━┛   א╚═╝ת  a└─┘z   ╰─╯[m[?2500l[?2501l[1 k
+
+                                ┌──────────────┐
+────────────────────────────────┤ Explicit LTR ├────────────────────────────────
+                                └──────────────┘
+[01mLTR + fake RTL[m
+[00m⸤Hello⸣ ⸤mlhS⸣[m
+[32m⸤Hello⸣ ⸤oi7w⸣[m
+[36m[8l⸤Hello⸣ ⸤םוֹלשָׁ⸣[8h[m
+
+[01mFake RTL + RTL[m
+[00m⸤mlhS⸣ ⸤Hello⸣[m
+[32m⸤oi7w⸣ ⸤Hello⸣[m
+[36m[8l⸤םוֹלשָׁ⸣ ⸤Hello⸣[8h[m
+
+[01mArabic shaping[m
+[32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36m[8lرماوألا رطس لمعتسا – ةيفرطلا[8h[m
+
+[01mBox[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m[8l
+[36m┗━┛   a╚═╝z  ת└─┘א   ╰─╯[m[8h
+
+[01mBox in mirrored mode[m
+[32m┏━┓   a╔═╗z  n┌─┐x   ╭─╮[m[8l[?2500h
+[36m┗━┛   a╚═╝z  ת└─┘א   ╰─╯[m[?2500l[8h
+
+                                ┌──────────────┐
+────────────────────────────────┤ Explicit RTL ├────────────────────────────────
+                                └──────────────┘
+[01mFake LTR + RTL[m
+[00m⸤olleH⸣ ⸤Shlm⸣[m
+                                                                  [32m⸢oi7w⸥ ⸢Hello⸥[m
+[36m[8l[2 k⸤olleH⸣ ⸤שָׁלוֹם⸣[1 k[8h[m
+
+[01mRTL + fake LTR[m
+[00m⸤Shlm⸣ ⸤olleH⸣[m
+                                                                  [32m⸢Hello⸥ ⸢oi7w⸥[m
+[36m[8l[2 k⸤שָׁלוֹם⸣ ⸤olleH⸣[1 k[8h[m
+
+[01mFullwidth characters with underlines[m
+                        [32m［Ｌｏｒｅｍ  [4mｉｐｓｕｍ[24m  ｄｏｌｏｒ  [21mｓｉｔ[24m  ａｍｅｔ）[m
+[36m[8l[2 k（ｔｅｍａ  [21mｔｉｓ[24m  ｒｏｌｏｄ  [4mｍｕｓｐｉ[24m  ｍｅｒｏＬ］[1 k[8h[m
+
+[01mArabic shaping[m
+                                                    [32m╶─╶╶╶─╶ ╶── ╶────╶ ╶ ╶──╶──╶[m
+[36m[8l[2 kالطرفية – استعمل سطر الأوامر[1 k[8h[m
+
+[01mBox[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[8l[2 k
+[36m┛━┗   א╝═╚ת  z┘─└a   ╯─╰[m[1 k[8h
+
+[01mBox in mirrored mode[m
+                                                        [32m╭─╮   a┌─┐z  n╔═╗x   ┏━┓[m[8l[2 k[?2500h
+[36m┗━┛   א╚═╝ת  z└─┘a   ╰─╯[m[?2500l[1 k[8h
+
+                                 ┌────────────┐
+─────────────────────────────────┤ Misc tests ├─────────────────────────────────
+                                 └────────────┘
+[01mNumbers inside RTL, across linebreak[m
+[00mjumps Shalom 123 456 789 Shalom![m
+[32mThe quick brown fox jumps over the lazy dog The quick brown fox jumps 4 123 oi7w[m
+[32moi7w 789 56![m
+[36mThe quick brown fox jumps over the lazy dog The quick brown fox jumps שָׁלוֹם 123 456 789 שָׁלוֹם![m
+
+[01mMirroring across linebreak[m
+[00mjumps Shalom <[<[<[<[ Shalom![m
+[32mThe quick brown fox jumps over the lazy dog The quick brown fox jumps >]>]> oi7w[m
+[32moi7w ]>]![m
+[36mThe quick brown fox jumps over the lazy dog The quick brown fox jumps שָׁלוֹם <[<[<[<[ שָׁלוֹם![m
+
+[01mAttributes[m
+[00mHel[4mlo1 Shlm2[24m3 Shl[21mm456 H[24mello7890[m
+[32mHel[4mlo1 [24m[21m456o[24mi7w [4m2[24m3[4moi7w[24m[21m H[24mello7890[m
+[36mHel[4mlo1 שָׁלוֹם2[24m3 שָׁלוֹ[21mם456 H[24mello7890[m
+
+[01mLink autodetection, overall LTR[m
+[00mhttps!//he.wikipedia.org/wiki/Front_page[m
+[32m[4mhttps!//he.wikipedia.org/wiki/'wxᒣ_tiny[24m[m
+[36mhttps://he.wikipedia.org/wiki/עמוד_ראשי[m
+
+[01mLink autodetection, overall LTR (should look broken)[m
+[00mhttps!//he.wikipedia.org/wiki/Front_page Shalom[m
+[32m[4mhttps!//he.wikipedia.org/wiki/[24moi7w [4m'wxᒣ_tiny[24m[m
+[36mhttps://he.wikipedia.org/wiki/עמוד_ראשי שָׁלוֹם[m
+
+[01mLink autodetection, overall RTL[m
+[00mShalom1 http!//example.com/test Shalom23[m
+[32m                                            23oi7w [4mhttp!//example.com/test[24m 1oi7w[m
+[36m[2 kשָׁלוֹם1 http://example.com/test שָׁלוֹם23[1 k[m
+
+[01mLink autodetection, overall RTL (should look broken)[m
+[00mShalom1 http!//example.com/test/ Shalom23[m
+[32m                                           23oi7w [4m/http!//example.com/test[24m 1oi7w[m
+[36m[2 kשָׁלוֹם1 http://example.com/test/ שָׁלוֹם23[1 k[m
+
+[01mExplicit hyperlinks[m
+[00m[4mHello1 Shlm23[24m [4mShlm456 Hello7890[24m[m
+[32m[4mHello1 [24m456oi7w [4m23oi7w[24m Hello7890[m
+[32mHello1 [4m456oi7w[24m 23oi7w[4m Hello7890[24m[m
+[36m]8;;http://example.com/hello123\Hello1 שָׁלוֹם23]8;;\ 
]8;;http://example.com/hello4567890\שָׁלוֹם456 Hello7890]8;;\[m
+
+────────────────────────────────────────────────────────────────────────────────
diff --git a/src/vte/vteterminal.h b/src/vte/vteterminal.h
index 26ac236e..5c7e721e 100644
--- a/src/vte/vteterminal.h
+++ b/src/vte/vteterminal.h
@@ -113,7 +113,7 @@ struct _VteTerminalClass {
 /* The structure we return as the supplemental attributes for strings. */
 struct _VteCharAttributes {
         /*< private >*/
-       long row, column;
+        long row, column;  // FIXME clarify if column is logical or visual
        PangoColor fore, back;
        guint underline:1, strikethrough:1, columns:4;
 };
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