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#include "cru/common/Format.h"
namespace cru {
namespace details {
FormatToken ParsePlaceHolder(String place_holder_string) {
if (place_holder_string.empty()) {
return FormatToken::NonePlaceHolder({});
}
if (place_holder_string.StartWith(u":")) {
if (place_holder_string.Find(u':', 1) != -1) {
throw Exception(u"Two ':' inside placeholder.");
}
return FormatToken::NonePlaceHolder(place_holder_string.substr(1));
}
if (IsDigit(place_holder_string[0])) {
int position = 0;
int index = 0;
while (index < place_holder_string.size() &&
IsDigit(place_holder_string[index])) {
position = position * 10 + place_holder_string[index] - '0';
index++;
}
String option;
if (index != place_holder_string.size()) {
if (place_holder_string[index] != ':') {
throw Exception(u"Invalid placeholder in format.");
}
option = place_holder_string.substr(index + 1);
}
return FormatToken::PositionedPlaceHolder(position, std::move(option));
}
auto separator_index = place_holder_string.Find(':');
if (separator_index == -1) {
return FormatToken::NamedPlaceHolder(place_holder_string, {});
} else {
return FormatToken::NamedPlaceHolder(
place_holder_string.substr(0, separator_index),
place_holder_string.substr(separator_index + 1));
}
}
std::vector<FormatToken> ParseToFormatTokenList(StringView str) {
std::vector<FormatToken> result;
auto push_char = [&result](char16_t c) {
if (result.empty() || result.back().type == FormatTokenType::PlaceHolder) {
result.push_back(FormatToken::Text());
}
result.back().data.append(c);
};
bool try_to_escape = false;
bool is_in_place_holder = false;
String place_holder_string;
for (auto c : str) {
if (c == u'{') {
if (try_to_escape) {
push_char(u'{');
try_to_escape = false;
is_in_place_holder = false;
} else {
if (is_in_place_holder) {
throw Exception(u"Invalid format string: '{' inside placeholder.");
}
try_to_escape = true;
is_in_place_holder = true;
}
} else if (c == u'}') {
if (is_in_place_holder) {
is_in_place_holder = false;
result.push_back(ParsePlaceHolder(std::move(place_holder_string)));
place_holder_string.clear();
} else {
push_char(u'}');
}
try_to_escape = false;
} else {
if (is_in_place_holder) {
place_holder_string.push_back(c);
} else {
push_char(c);
}
try_to_escape = false;
}
}
return result;
}
void FormatAppendFromFormatTokenList(
String& current, const std::vector<FormatToken>& format_token_list,
Index index) {
for (Index i = index; i < static_cast<Index>(format_token_list.size()); i++) {
const auto& token = format_token_list[i];
if (token.type == FormatTokenType::PlaceHolder) {
throw Exception(u"More placeholder than args.");
} else {
current += token.data;
}
}
}
} // namespace details
} // namespace cru
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