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fix: check it is empty before calling back

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ToruNiina
2020-11-04 23:24:59 +09:00
parent 1ead14589e
commit 9b472a6c72
1 changed files with 7 additions and 4 deletions
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11
toml/serializer.hpp
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@@ -122,7 +122,7 @@ struct serializer
std::snprintf(buf.data(), buf.size(), fmt, this->float_prec_, f); std::snprintf(buf.data(), buf.size(), fmt, this->float_prec_, f);
std::string token(buf.begin(), std::prev(buf.end())); std::string token(buf.begin(), std::prev(buf.end()));
if(token.back() == '.') // 1. => 1.0 if(!token.empty() && token.back() == '.') // 1. => 1.0
{ {
token += '0'; token += '0';
} }
@@ -304,7 +304,7 @@ struct serializer
token += '\n'; token += '\n';
} }
token += toml::visit(*this, item); token += toml::visit(*this, item);
if(token.back() == '\n') {token.pop_back();} if(!token.empty() && token.back() == '\n') {token.pop_back();}
token += ",\n"; token += ",\n";
continue; continue;
} }
@@ -312,7 +312,7 @@ struct serializer
next_elem += toml::visit(*this, item); next_elem += toml::visit(*this, item);
// comma before newline. // comma before newline.
if(next_elem.back() == '\n') {next_elem.pop_back();} if(!next_elem.empty() && next_elem.back() == '\n') {next_elem.pop_back();}
// if current line does not exceeds the width limit, continue. // if current line does not exceeds the width limit, continue.
if(current_line.size() + next_elem.size() + 1 < this->width_) if(current_line.size() + next_elem.size() + 1 < this->width_)
@@ -339,7 +339,10 @@ struct serializer
} }
if(!current_line.empty()) if(!current_line.empty())
{ {
if(current_line.back() != '\n') {current_line += '\n';} if(!current_line.empty() && current_line.back() != '\n')
{
current_line += '\n';
}
token += current_line; token += current_line;
} }
token += "]\n"; token += "]\n";