70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
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#include "utils.h"
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namespace humanus {
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const std::filesystem::path PROJECT_ROOT = get_project_root();
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size_t validate_utf8(const std::string& text) {
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size_t len = text.size();
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if (len == 0) return 0;
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// Check the last few bytes to see if a multi-byte character is cut off
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for (size_t i = 1; i <= 4 && i <= len; ++i) {
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unsigned char c = text[len - i];
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// Check for start of a multi-byte sequence from the end
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if ((c & 0xE0) == 0xC0) {
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// 2-byte character start: 110xxxxx
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// Needs at least 2 bytes
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if (i < 2) return len - i;
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} else if ((c & 0xF0) == 0xE0) {
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// 3-byte character start: 1110xxxx
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// Needs at least 3 bytes
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if (i < 3) return len - i;
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} else if ((c & 0xF8) == 0xF0) {
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// 4-byte character start: 11110xxx
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// Needs at least 4 bytes
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if (i < 4) return len - i;
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}
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}
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// If no cut-off multi-byte character is found, return full length
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return len;
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}
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bool readline_utf8(std::string & line, bool multiline_input) {
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#if defined(_WIN32)
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std::wstring wline;
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if (!std::getline(std::wcin, wline)) {
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// Input stream is bad or EOF received
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line.clear();
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GenerateConsoleCtrlEvent(CTRL_C_EVENT, 0);
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return false;
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}
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int size_needed = WideCharToMultiByte(CP_UTF8, 0, &wline[0], (int)wline.size(), NULL, 0, NULL, NULL);
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line.resize(size_needed);
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WideCharToMultiByte(CP_UTF8, 0, &wline[0], (int)wline.size(), &line[0], size_needed, NULL, NULL);
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#else
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if (!std::getline(std::cin, line)) {
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// Input stream is bad or EOF received
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line.clear();
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return false;
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}
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#endif
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if (!line.empty()) {
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char last = line.back();
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if (last == '/') { // Always return control on '/' symbol
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line.pop_back();
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return false;
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}
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if (last == '\\') { // '\\' changes the default action
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line.pop_back();
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multiline_input = !multiline_input;
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}
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}
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// By default, continue input if multiline_input is set
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return multiline_input;
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}
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} // namespace humanus
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