Public Access
twislaandClaude Opus 5.5
879cb0d0b6
Steps 5 and 6 of M0. - lib/ui (host-tested): ListModel, LineEditor (UTF-8, byte-limited), wrapText, ToastQueue, DialogModel - lib/input (host-tested): KeyMapper turns keyboard state into logical keys (Fn arrows, ` Back, Fn+` Home) and composes accents with opt - src/ui: off-screen 16-bit frame pushed in one transfer (fixes the flicker), Status Bar, list, text, line editor, dialog, Toast widgets, Notifier (Toast + beep + LED), vendored public-domain Latin-1 fonts - Apps: minimal Launcher, Widget demo, Diagnostics (SD erase now behind a confirmation dialog) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
#pragma once
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#include <cstdint>
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#include <string>
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namespace roro::utf8 {
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inline bool isContinuation(unsigned char c) { return (c & 0xC0) == 0x80; }
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inline std::string encode(uint32_t cp) {
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std::string out;
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if (cp < 0x80) {
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out += static_cast<char>(cp);
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} else if (cp < 0x800) {
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out += static_cast<char>(0xC0 | (cp >> 6));
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out += static_cast<char>(0x80 | (cp & 0x3F));
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} else if (cp < 0x10000) {
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out += static_cast<char>(0xE0 | (cp >> 12));
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out += static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
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out += static_cast<char>(0x80 | (cp & 0x3F));
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} else {
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out += static_cast<char>(0xF0 | (cp >> 18));
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out += static_cast<char>(0x80 | ((cp >> 12) & 0x3F));
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out += static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
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out += static_cast<char>(0x80 | (cp & 0x3F));
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}
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return out;
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}
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// Byte index of the character start before / after `pos`.
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inline size_t previous(const std::string& s, size_t pos) {
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if (pos == 0) return 0;
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do pos--;
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while (pos > 0 && isContinuation(static_cast<unsigned char>(s[pos])));
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return pos;
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}
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inline size_t next(const std::string& s, size_t pos) {
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if (pos >= s.size()) return s.size();
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do pos++;
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while (pos < s.size() && isContinuation(static_cast<unsigned char>(s[pos])));
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return pos;
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}
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// Longest prefix of at most `maxBytes` that doesn't cut a character.
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inline size_t clampToBoundary(const std::string& s, size_t maxBytes) {
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if (s.size() <= maxBytes) return s.size();
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size_t pos = maxBytes;
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while (pos > 0 && isContinuation(static_cast<unsigned char>(s[pos]))) pos--;
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return pos;
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}
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} // namespace roro::utf8
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