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Rewrite FormatParagraph to handle newlines within input strings correctly

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This commit is contained in:
Luke Dashjr
2016-02-03 05:16:49 +00:00
parent cddffaf5e6
commit cc2095ecae
2 changed files with 49 additions and 28 deletions
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56
src/utilstrencodings.cpp
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@@ -478,34 +478,40 @@ bool ParseDouble(const std::string& str, double *out)
std::string FormatParagraph(const std::string& in, size_t width, size_t indent)
{
std::stringstream out;
size_t col = 0;
size_t ptr = 0;
while(ptr < in.size())
size_t indented = 0;
while (ptr < in.size())
{
// Find beginning of next word
ptr = in.find_first_not_of(' ', ptr);
if (ptr == std::string::npos)
break;
// Find end of next word
size_t endword = in.find_first_of(' ', ptr);
if (endword == std::string::npos)
endword = in.size();
// Add newline and indentation if this wraps over the allowed width
if (col > 0)
{
if ((col + endword - ptr) > width)
{
out << '\n';
for(size_t i=0; i<indent; ++i)
out << ' ';
col = 0;
} else
out << ' ';
size_t lineend = in.find_first_of('\n', ptr);
if (lineend == std::string::npos) {
lineend = in.size();
}
const size_t linelen = lineend - ptr;
const size_t rem_width = width - indented;
if (linelen <= rem_width) {
out << in.substr(ptr, linelen + 1);
ptr = lineend + 1;
indented = 0;
} else {
size_t finalspace = in.find_last_of(" \n", ptr + rem_width);
if (finalspace == std::string::npos || finalspace < ptr) {
// No place to break; just include the entire word and move on
finalspace = in.find_first_of("\n ", ptr);
if (finalspace == std::string::npos) {
// End of the string, just add it and break
out << in.substr(ptr);
break;
}
}
out << in.substr(ptr, finalspace - ptr) << "\n";
if (in[finalspace] == '\n') {
indented = 0;
} else if (indent) {
out << std::string(indent, ' ');
indented = indent;
}
ptr = finalspace + 1;
}
// Append word
out << in.substr(ptr, endword - ptr);
col += endword - ptr + 1;
ptr = endword;
}
return out.str();
}