osb/source/core/StarText.cpp
2023-07-22 22:31:04 +10:00

89 lines
2.4 KiB
C++

#include "StarText.hpp"
#include <regex>
namespace Star {
namespace Text {
static auto stripEscapeRegex = std::regex(strf("\\{:c}[^;]*{:c}", CmdEsc, EndEsc));
String stripEscapeCodes(String const& s) {
return std::regex_replace(s.utf8(), stripEscapeRegex, "");
}
static std::string escapeChars = strf("{:c}{:c}", CmdEsc, StartEsc);
bool processText(StringView text, TextCallback textFunc, CommandsCallback commandsFunc, bool includeCommandSides) {
std::string_view escChars(escapeChars);
std::string_view str = text.utf8();
while (true) {
size_t escape = str.find_first_of(escChars);
if (escape != NPos) {
escape = str.find_first_not_of(escChars, escape) - 1; // jump to the last ^
size_t end = str.find_first_of(EndEsc, escape);
if (end != NPos) {
if (escape && !textFunc(str.substr(0, escape)))
return false;
if (commandsFunc) {
StringView commands = includeCommandSides
? str.substr(escape, end - escape + 1)
: str.substr(escape + 1, end - escape - 1);
if (!commands.empty() && !commandsFunc(commands))
return false;
}
str = str.substr(end + 1);
continue;
}
}
if (!str.empty())
return textFunc(str);
return true;
}
}
// The below two functions aren't used anymore, not bothering with StringView for them
String preprocessEscapeCodes(String const& s) {
bool escape = false;
std::string result = s.utf8();
size_t escapeStartIdx = 0;
for (size_t i = 0; i < result.size(); i++) {
auto& c = result[i];
if (isEscapeCode(c)) {
escape = true;
escapeStartIdx = i;
}
if ((c <= SpecialCharLimit) && !(c == StartEsc))
escape = false;
if ((c == EndEsc) && escape)
result[escapeStartIdx] = StartEsc;
}
return {result};
}
String extractCodes(String const& s) {
bool escape = false;
StringList result;
String escapeCode;
for (auto c : preprocessEscapeCodes(s)) {
if (c == StartEsc)
escape = true;
if (c == EndEsc) {
escape = false;
for (auto command : escapeCode.split(','))
result.append(command);
escapeCode = "";
}
if (escape && (c != StartEsc))
escapeCode.append(c);
}
if (!result.size())
return "";
return "^" + result.join(",") + ";";
}
}
}