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Support full-width characters (CJK)
+ 3 tests. The goal is to fix: https://github.com/ArthurSonzogni/FTXUI/issues/2#issuecomment-504871456
This commit is contained in:
ArthurSonzogni
parent
9c1913de51
commit
eb6baaceea
@ -14,6 +14,7 @@ add_library(screen
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src/ftxui/screen/screen.cpp
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src/ftxui/screen/string.cpp
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src/ftxui/screen/terminal.cpp
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src/ftxui/screen/wcwidth.cpp
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)
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add_library(dom
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@ -1,3 +1,6 @@
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#ifndef FTXUI_SCREEN_STRING_HPP
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#define FTXUI_SCREEN_STRING_HPP
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#include <string>
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std::string to_string(const std::wstring& s);
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@ -7,3 +10,10 @@ template<typename T>
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std::wstring to_wstring(T s) {
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return to_wstring(std::to_string(s));
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}
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int wchar_width(wchar_t);
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int wchar_width_cjk(wchar_t);
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int wstring_width(const std::wstring&);
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int wstring_width_cjk(const std::wstring&);
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#endif /* end of include guard: FTXUI_SCREEN_STRING_HPP */
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@ -43,16 +43,6 @@ Event ParseUTF8(std::function<char()>& getchar, std::string& input) {
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return Event::Character(input);
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}
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void ParsePs(std::function<char()> getchar, std::string input) {
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while (1) {
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char key = getchar();
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input += key;
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if ('0' <= key && key <= '9')
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continue;
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return;
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}
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}
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Event ParseCSI(std::function<char()> getchar, std::string& input) {
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while (1) {
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char c = getchar();
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@ -1,4 +1,5 @@
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#include "ftxui/dom/node.hpp"
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#include "ftxui/screen/string.hpp"
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namespace ftxui {
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@ -10,7 +11,7 @@ class Text : public Node {
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~Text() {}
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void ComputeRequirement() override {
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requirement_.min.x = text_.size();
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requirement_.min.x = wstring_width(text_);
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requirement_.min.y = 1;
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}
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@ -22,7 +23,8 @@ class Text : public Node {
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for (wchar_t c : text_) {
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if (x > box_.x_max)
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return;
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screen.at(x++, y) = c;
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screen.at(x, y) = c;
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x += wchar_width(c);
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}
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}
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@ -104,9 +104,12 @@ std::string Screen::ToString() {
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for (int y = 0; y < dimy_; ++y) {
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if (y != 0)
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ss << '\n';
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for (int x = 0; x < dimx_; ++x) {
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UpdatePixelStyle(ss, previous_pixel, pixels_[y][x]);
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ss << pixels_[y][x].character;
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for (int x = 0; x < dimx_;) {
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auto& pixel = pixels_[y][x];
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wchar_t c = pixel.character;
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UpdatePixelStyle(ss, previous_pixel, pixel);
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ss << c;
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x += wchar_width(c);
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}
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}
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300
src/ftxui/screen/wcwidth.cpp
Normal file
300
src/ftxui/screen/wcwidth.cpp
Normal file
@ -0,0 +1,300 @@
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/*
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* This is an implementation of wcwidth() and wcswidth() (defined in
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* IEEE Std 1002.1-2001) for Unicode.
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*
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* http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
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* http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
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*
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* In fixed-width output devices, Latin characters all occupy a single
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* "cell" position of equal width, whereas ideographic CJK characters
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* occupy two such cells. Interoperability between terminal-line
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* applications and (teletype-style) character terminals using the
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* UTF-8 encoding requires agreement on which character should advance
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* the cursor by how many cell positions. No established formal
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* standards exist at present on which Unicode character shall occupy
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* how many cell positions on character terminals. These routines are
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* a first attempt of defining such behavior based on simple rules
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* applied to data provided by the Unicode Consortium.
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*
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* For some graphical characters, the Unicode standard explicitly
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* defines a character-cell width via the definition of the East Asian
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* FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
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* In all these cases, there is no ambiguity about which width a
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* terminal shall use. For characters in the East Asian Ambiguous (A)
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* class, the width choice depends purely on a preference of backward
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* compatibility with either historic CJK or Western practice.
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* Choosing single-width for these characters is easy to justify as
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* the appropriate long-term solution, as the CJK practice of
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* displaying these characters as double-width comes from historic
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* implementation simplicity (8-bit encoded characters were displayed
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* single-width and 16-bit ones double-width, even for Greek,
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* Cyrillic, etc.) and not any typographic considerations.
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*
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* Much less clear is the choice of width for the Not East Asian
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* (Neutral) class. Existing practice does not dictate a width for any
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* of these characters. It would nevertheless make sense
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* typographically to allocate two character cells to characters such
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* as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
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* represented adequately with a single-width glyph. The following
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* routines at present merely assign a single-cell width to all
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* neutral characters, in the interest of simplicity. This is not
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* entirely satisfactory and should be reconsidered before
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* establishing a formal standard in this area. At the moment, the
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* decision which Not East Asian (Neutral) characters should be
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* represented by double-width glyphs cannot yet be answered by
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* applying a simple rule from the Unicode database content. Setting
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* up a proper standard for the behavior of UTF-8 character terminals
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* will require a careful analysis not only of each Unicode character,
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* but also of each presentation form, something the author of these
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* routines has avoided to do so far.
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*
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* http://www.unicode.org/unicode/reports/tr11/
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*
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* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
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*
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* Permission to use, copy, modify, and distribute this software
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* for any purpose and without fee is hereby granted. The author
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* disclaims all warranties with regard to this software.
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*
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* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
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*/
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#include "ftxui/screen/string.hpp"
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#include <wchar.h>
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namespace {
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struct interval {
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int first;
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int last;
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};
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/* auxiliary function for binary search in interval table */
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int bisearch(wchar_t ucs, const struct interval* table, int max) {
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int min = 0;
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int mid;
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if (ucs < table[0].first || ucs > table[max].last)
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return 0;
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while (max >= min) {
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mid = (min + max) / 2;
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if (ucs > table[mid].last)
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min = mid + 1;
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else if (ucs < table[mid].first)
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max = mid - 1;
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else
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return 1;
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}
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return 0;
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}
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} // namespace
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/* The following two functions define the column width of an ISO 10646
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* character as follows:
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*
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* - The null character (U+0000) has a column width of 0.
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*
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* - Other C0/C1 control characters and DEL will lead to a return
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* value of -1.
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*
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* - Non-spacing and enclosing combining characters (general
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* category code Mn or Me in the Unicode database) have a
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* column width of 0.
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*
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* - SOFT HYPHEN (U+00AD) has a column width of 1.
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*
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* - Other format characters (general category code Cf in the Unicode
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* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
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*
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* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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* have a column width of 0.
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*
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* - Spacing characters in the East Asian Wide (W) or East Asian
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* Full-width (F) category as defined in Unicode Technical
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* Report #11 have a column width of 2.
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*
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* - All remaining characters (including all printable
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* ISO 8859-1 and WGL4 characters, Unicode control characters,
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* etc.) have a column width of 1.
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*
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* This implementation assumes that wchar_t characters are encoded
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* in ISO 10646.
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*/
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int wchar_width(wchar_t ucs) {
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/* sorted list of non-overlapping intervals of non-spacing characters */
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/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
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static const struct interval combining[] = {
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{0x0300, 0x036F}, {0x0483, 0x0486}, {0x0488, 0x0489},
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{0x0591, 0x05BD}, {0x05BF, 0x05BF}, {0x05C1, 0x05C2},
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{0x05C4, 0x05C5}, {0x05C7, 0x05C7}, {0x0600, 0x0603},
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{0x0610, 0x0615}, {0x064B, 0x065E}, {0x0670, 0x0670},
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{0x06D6, 0x06E4}, {0x06E7, 0x06E8}, {0x06EA, 0x06ED},
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{0x070F, 0x070F}, {0x0711, 0x0711}, {0x0730, 0x074A},
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{0x07A6, 0x07B0}, {0x07EB, 0x07F3}, {0x0901, 0x0902},
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{0x093C, 0x093C}, {0x0941, 0x0948}, {0x094D, 0x094D},
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{0x0951, 0x0954}, {0x0962, 0x0963}, {0x0981, 0x0981},
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{0x09BC, 0x09BC}, {0x09C1, 0x09C4}, {0x09CD, 0x09CD},
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{0x09E2, 0x09E3}, {0x0A01, 0x0A02}, {0x0A3C, 0x0A3C},
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{0x0A41, 0x0A42}, {0x0A47, 0x0A48}, {0x0A4B, 0x0A4D},
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{0x0A70, 0x0A71}, {0x0A81, 0x0A82}, {0x0ABC, 0x0ABC},
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{0x0AC1, 0x0AC5}, {0x0AC7, 0x0AC8}, {0x0ACD, 0x0ACD},
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{0x0AE2, 0x0AE3}, {0x0B01, 0x0B01}, {0x0B3C, 0x0B3C},
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{0x0B3F, 0x0B3F}, {0x0B41, 0x0B43}, {0x0B4D, 0x0B4D},
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{0x0B56, 0x0B56}, {0x0B82, 0x0B82}, {0x0BC0, 0x0BC0},
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{0x0BCD, 0x0BCD}, {0x0C3E, 0x0C40}, {0x0C46, 0x0C48},
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{0x0C4A, 0x0C4D}, {0x0C55, 0x0C56}, {0x0CBC, 0x0CBC},
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{0x0CBF, 0x0CBF}, {0x0CC6, 0x0CC6}, {0x0CCC, 0x0CCD},
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{0x0CE2, 0x0CE3}, {0x0D41, 0x0D43}, {0x0D4D, 0x0D4D},
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{0x0DCA, 0x0DCA}, {0x0DD2, 0x0DD4}, {0x0DD6, 0x0DD6},
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{0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E},
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{0x0EB1, 0x0EB1}, {0x0EB4, 0x0EB9}, {0x0EBB, 0x0EBC},
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{0x0EC8, 0x0ECD}, {0x0F18, 0x0F19}, {0x0F35, 0x0F35},
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{0x0F37, 0x0F37}, {0x0F39, 0x0F39}, {0x0F71, 0x0F7E},
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{0x0F80, 0x0F84}, {0x0F86, 0x0F87}, {0x0F90, 0x0F97},
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{0x0F99, 0x0FBC}, {0x0FC6, 0x0FC6}, {0x102D, 0x1030},
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{0x1032, 0x1032}, {0x1036, 0x1037}, {0x1039, 0x1039},
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{0x1058, 0x1059}, {0x1160, 0x11FF}, {0x135F, 0x135F},
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{0x1712, 0x1714}, {0x1732, 0x1734}, {0x1752, 0x1753},
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{0x1772, 0x1773}, {0x17B4, 0x17B5}, {0x17B7, 0x17BD},
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{0x17C6, 0x17C6}, {0x17C9, 0x17D3}, {0x17DD, 0x17DD},
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{0x180B, 0x180D}, {0x18A9, 0x18A9}, {0x1920, 0x1922},
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{0x1927, 0x1928}, {0x1932, 0x1932}, {0x1939, 0x193B},
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{0x1A17, 0x1A18}, {0x1B00, 0x1B03}, {0x1B34, 0x1B34},
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{0x1B36, 0x1B3A}, {0x1B3C, 0x1B3C}, {0x1B42, 0x1B42},
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{0x1B6B, 0x1B73}, {0x1DC0, 0x1DCA}, {0x1DFE, 0x1DFF},
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{0x200B, 0x200F}, {0x202A, 0x202E}, {0x2060, 0x2063},
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{0x206A, 0x206F}, {0x20D0, 0x20EF}, {0x302A, 0x302F},
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{0x3099, 0x309A}, {0xA806, 0xA806}, {0xA80B, 0xA80B},
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{0xA825, 0xA826}, {0xFB1E, 0xFB1E}, {0xFE00, 0xFE0F},
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{0xFE20, 0xFE23}, {0xFEFF, 0xFEFF}, {0xFFF9, 0xFFFB},
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{0x10A01, 0x10A03}, {0x10A05, 0x10A06}, {0x10A0C, 0x10A0F},
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{0x10A38, 0x10A3A}, {0x10A3F, 0x10A3F}, {0x1D167, 0x1D169},
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{0x1D173, 0x1D182}, {0x1D185, 0x1D18B}, {0x1D1AA, 0x1D1AD},
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{0x1D242, 0x1D244}, {0xE0001, 0xE0001}, {0xE0020, 0xE007F},
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{0xE0100, 0xE01EF}};
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/* test for 8-bit control characters */
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if (ucs == 0)
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return 0;
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
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return -1;
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/* binary search in table of non-spacing characters */
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if (bisearch(ucs, combining, sizeof(combining) / sizeof(struct interval) - 1))
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return 0;
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/* if we arrive here, ucs is not a combining or C0/C1 control character */
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return 1 +
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(ucs >= 0x1100 &&
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(ucs <= 0x115f || /* Hangul Jamo init. consonants */
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ucs == 0x2329 || ucs == 0x232a ||
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(ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) || /* CJK ... Yi */
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(ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
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(ucs >= 0xf900 &&
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ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
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(ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
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(ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
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(ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
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(ucs >= 0xffe0 && ucs <= 0xffe6) ||
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(ucs >= 0x20000 && ucs <= 0x2fffd) ||
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(ucs >= 0x30000 && ucs <= 0x3fffd)));
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}
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/*
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* The following functions are the same as mk_wcwidth() and
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* mk_wcswidth(), except that spacing characters in the East Asian
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* Ambiguous (A) category as defined in Unicode Technical Report #11
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* have a column width of 2. This variant might be useful for users of
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* CJK legacy encodings who want to migrate to UCS without changing
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* the traditional terminal character-width behaviour. It is not
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* otherwise recommended for general use.
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*/
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int wchar_width_cjk(wchar_t ucs) {
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/* sorted list of non-overlapping intervals of East Asian Ambiguous
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* characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
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static const struct interval ambiguous[] = {
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{0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8},
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{0x00AA, 0x00AA}, {0x00AE, 0x00AE}, {0x00B0, 0x00B4},
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{0x00B6, 0x00BA}, {0x00BC, 0x00BF}, {0x00C6, 0x00C6},
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{0x00D0, 0x00D0}, {0x00D7, 0x00D8}, {0x00DE, 0x00E1},
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{0x00E6, 0x00E6}, {0x00E8, 0x00EA}, {0x00EC, 0x00ED},
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{0x00F0, 0x00F0}, {0x00F2, 0x00F3}, {0x00F7, 0x00FA},
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{0x00FC, 0x00FC}, {0x00FE, 0x00FE}, {0x0101, 0x0101},
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{0x0111, 0x0111}, {0x0113, 0x0113}, {0x011B, 0x011B},
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{0x0126, 0x0127}, {0x012B, 0x012B}, {0x0131, 0x0133},
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{0x0138, 0x0138}, {0x013F, 0x0142}, {0x0144, 0x0144},
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{0x0148, 0x014B}, {0x014D, 0x014D}, {0x0152, 0x0153},
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{0x0166, 0x0167}, {0x016B, 0x016B}, {0x01CE, 0x01CE},
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{0x01D0, 0x01D0}, {0x01D2, 0x01D2}, {0x01D4, 0x01D4},
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{0x01D6, 0x01D6}, {0x01D8, 0x01D8}, {0x01DA, 0x01DA},
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{0x01DC, 0x01DC}, {0x0251, 0x0251}, {0x0261, 0x0261},
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{0x02C4, 0x02C4}, {0x02C7, 0x02C7}, {0x02C9, 0x02CB},
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{0x02CD, 0x02CD}, {0x02D0, 0x02D0}, {0x02D8, 0x02DB},
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{0x02DD, 0x02DD}, {0x02DF, 0x02DF}, {0x0391, 0x03A1},
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{0x03A3, 0x03A9}, {0x03B1, 0x03C1}, {0x03C3, 0x03C9},
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{0x0401, 0x0401}, {0x0410, 0x044F}, {0x0451, 0x0451},
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{0x2010, 0x2010}, {0x2013, 0x2016}, {0x2018, 0x2019},
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{0x201C, 0x201D}, {0x2020, 0x2022}, {0x2024, 0x2027},
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{0x2030, 0x2030}, {0x2032, 0x2033}, {0x2035, 0x2035},
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{0x203B, 0x203B}, {0x203E, 0x203E}, {0x2074, 0x2074},
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{0x207F, 0x207F}, {0x2081, 0x2084}, {0x20AC, 0x20AC},
|
||||
{0x2103, 0x2103}, {0x2105, 0x2105}, {0x2109, 0x2109},
|
||||
{0x2113, 0x2113}, {0x2116, 0x2116}, {0x2121, 0x2122},
|
||||
{0x2126, 0x2126}, {0x212B, 0x212B}, {0x2153, 0x2154},
|
||||
{0x215B, 0x215E}, {0x2160, 0x216B}, {0x2170, 0x2179},
|
||||
{0x2190, 0x2199}, {0x21B8, 0x21B9}, {0x21D2, 0x21D2},
|
||||
{0x21D4, 0x21D4}, {0x21E7, 0x21E7}, {0x2200, 0x2200},
|
||||
{0x2202, 0x2203}, {0x2207, 0x2208}, {0x220B, 0x220B},
|
||||
{0x220F, 0x220F}, {0x2211, 0x2211}, {0x2215, 0x2215},
|
||||
{0x221A, 0x221A}, {0x221D, 0x2220}, {0x2223, 0x2223},
|
||||
{0x2225, 0x2225}, {0x2227, 0x222C}, {0x222E, 0x222E},
|
||||
{0x2234, 0x2237}, {0x223C, 0x223D}, {0x2248, 0x2248},
|
||||
{0x224C, 0x224C}, {0x2252, 0x2252}, {0x2260, 0x2261},
|
||||
{0x2264, 0x2267}, {0x226A, 0x226B}, {0x226E, 0x226F},
|
||||
{0x2282, 0x2283}, {0x2286, 0x2287}, {0x2295, 0x2295},
|
||||
{0x2299, 0x2299}, {0x22A5, 0x22A5}, {0x22BF, 0x22BF},
|
||||
{0x2312, 0x2312}, {0x2460, 0x24E9}, {0x24EB, 0x254B},
|
||||
{0x2550, 0x2573}, {0x2580, 0x258F}, {0x2592, 0x2595},
|
||||
{0x25A0, 0x25A1}, {0x25A3, 0x25A9}, {0x25B2, 0x25B3},
|
||||
{0x25B6, 0x25B7}, {0x25BC, 0x25BD}, {0x25C0, 0x25C1},
|
||||
{0x25C6, 0x25C8}, {0x25CB, 0x25CB}, {0x25CE, 0x25D1},
|
||||
{0x25E2, 0x25E5}, {0x25EF, 0x25EF}, {0x2605, 0x2606},
|
||||
{0x2609, 0x2609}, {0x260E, 0x260F}, {0x2614, 0x2615},
|
||||
{0x261C, 0x261C}, {0x261E, 0x261E}, {0x2640, 0x2640},
|
||||
{0x2642, 0x2642}, {0x2660, 0x2661}, {0x2663, 0x2665},
|
||||
{0x2667, 0x266A}, {0x266C, 0x266D}, {0x266F, 0x266F},
|
||||
{0x273D, 0x273D}, {0x2776, 0x277F}, {0xE000, 0xF8FF},
|
||||
{0xFFFD, 0xFFFD}, {0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD}};
|
||||
|
||||
/* binary search in table of non-spacing characters */
|
||||
if (bisearch(ucs, ambiguous, sizeof(ambiguous) / sizeof(struct interval) - 1))
|
||||
return 2;
|
||||
|
||||
return wchar_width(ucs);
|
||||
}
|
||||
|
||||
int wstring_width(const std::wstring& text) {
|
||||
int width = 0;
|
||||
|
||||
for (const wchar_t& it : text) {
|
||||
int w = wchar_width(it);
|
||||
if (w < 0)
|
||||
return -1;
|
||||
width += w;
|
||||
}
|
||||
return width;
|
||||
}
|
||||
|
||||
int wstring_width_cjk(const std::wstring& text) {
|
||||
int width = 0;
|
||||
|
||||
for (const wchar_t& it : text) {
|
||||
int w = wchar_width_cjk(it);
|
||||
if (w < 0)
|
||||
return -1;
|
||||
width += w;
|
||||
}
|
||||
return width;
|
||||
}
|
||||
@ -44,3 +44,39 @@ TEST(TextTest, ScreenBigger2) {
|
||||
|
||||
EXPECT_EQ("test \n ", screen.ToString());
|
||||
}
|
||||
|
||||
// See https://github.com/ArthurSonzogni/FTXUI/issues/2#issuecomment-504871456
|
||||
TEST(TextTest, CJK) {
|
||||
auto element = text(L"测试") | border;
|
||||
Screen screen(6, 3);
|
||||
Render(screen, element.get());
|
||||
EXPECT_EQ(
|
||||
"┌────┐\n"
|
||||
"│测试│\n"
|
||||
"└────┘",
|
||||
screen.ToString());
|
||||
}
|
||||
|
||||
// See https://github.com/ArthurSonzogni/FTXUI/issues/2#issuecomment-504871456
|
||||
TEST(TextTest, CJK_2) {
|
||||
auto element = text(L"测试") | border;
|
||||
Screen screen(5, 3);
|
||||
Render(screen, element.get());
|
||||
EXPECT_EQ(
|
||||
"┌───┐\n"
|
||||
"│测试\n"
|
||||
"└───┘",
|
||||
screen.ToString());
|
||||
}
|
||||
|
||||
// See https://github.com/ArthurSonzogni/FTXUI/issues/2#issuecomment-504871456
|
||||
TEST(TextTest, CJK_3) {
|
||||
auto element = text(L"测试") | border;
|
||||
Screen screen(4, 3);
|
||||
Render(screen, element.get());
|
||||
EXPECT_EQ(
|
||||
"┌──┐\n"
|
||||
"│测│\n"
|
||||
"└──┘",
|
||||
screen.ToString());
|
||||
}
|
||||
|
||||
@ -10,7 +10,7 @@ TEST(VBoxTest, ScreenSmaller1) {
|
||||
Screen screen(6, 1);
|
||||
Render(screen, root.get());
|
||||
|
||||
EXPECT_EQ("text_2", screen.ToString());
|
||||
EXPECT_EQ("text_1", screen.ToString());
|
||||
}
|
||||
|
||||
TEST(VBoxTest, ScreenFit) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user