lix/src/libutil/error.cc

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#include "error.hh"
#include <iostream>
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#include <optional>
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namespace nix
{
std::optional<string> ErrorInfo::programName = std::nullopt;
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string showErrPos(const ErrPos &errPos)
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{
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if (errPos.column > 0) {
return (format("(%1%:%2%)") % errPos.lineNumber % errPos.column).str();
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} else {
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return (format("(%1%)") % errPos.lineNumber).str();
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};
}
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void printCodeLines(const string &prefix, const NixCode &nixCode)
{
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// previous line of code.
if (nixCode.prevLineOfCode.has_value()) {
std::cout << format("%1% %|2$5d|| %3%")
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% prefix
% (nixCode.errPos.lineNumber - 1)
% *nixCode.prevLineOfCode
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<< std::endl;
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}
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// line of code containing the error.%2$+5d%
std::cout << format("%1% %|2$5d|| %3%")
% prefix
% (nixCode.errPos.lineNumber)
% nixCode.errLineOfCode
<< std::endl;
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// error arrows for the column range.
if (nixCode.errPos.column > 0) {
int start = nixCode.errPos.column;
std::string spaces;
for (int i = 0; i < start; ++i) {
spaces.append(" ");
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}
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std::string arrows("^");
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std::cout << format("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL) % prefix % spaces % arrows << std::endl;
}
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// next line of code.
if (nixCode.nextLineOfCode.has_value()) {
std::cout << format("%1% %|2$5d|| %3%")
% prefix
% (nixCode.errPos.lineNumber + 1)
% *nixCode.nextLineOfCode
<< std::endl;
}
}
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void printErrorInfo(const ErrorInfo &einfo)
{
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int errwidth = 80;
string prefix = " ";
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string levelString;
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switch (einfo.level) {
case ErrLevel::elError: {
levelString = ANSI_RED;
levelString += "error:";
levelString += ANSI_NORMAL;
break;
}
case ErrLevel::elWarning: {
levelString = ANSI_YELLOW;
levelString += "warning:";
levelString += ANSI_NORMAL;
break;
}
default: {
levelString = (format("invalid error level: %1%") % einfo.level).str();
break;
}
}
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int ndl = prefix.length() + levelString.length() + 3 + einfo.name.length() + einfo.programName.value_or("").length();
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int dashwidth = ndl > (errwidth - 3) ? 3 : errwidth - ndl;
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string dashes;
for (int i = 0; i < dashwidth; ++i)
dashes.append("-");
// divider.
std::cout << format("%1%%2%" ANSI_BLUE " %3% %4% %5% %6%" ANSI_NORMAL)
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% prefix
% levelString
% "---"
% einfo.name
% dashes
% einfo.programName.value_or("")
<< std::endl;
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// filename.
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if (einfo.nixCode.has_value()) {
if (einfo.nixCode->errPos.nixFile != "") {
string eline = einfo.nixCode->errLineOfCode != ""
? string(" ") + showErrPos(einfo.nixCode->errPos)
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: "";
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std::cout << format("%1%in file: " ANSI_BLUE "%2%%3%" ANSI_NORMAL)
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% prefix % einfo.nixCode->errPos.nixFile % eline << std::endl;
std::cout << prefix << std::endl;
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} else {
std::cout << format("%1%from command line argument") % prefix << std::endl;
std::cout << prefix << std::endl;
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}
}
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// description
std::cout << prefix << einfo.description << std::endl;
std::cout << prefix << std::endl;
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// lines of code.
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if (einfo.nixCode->errLineOfCode != "") {
printCodeLines(prefix, *einfo.nixCode);
std::cout << prefix << std::endl;
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}
// hint
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if (einfo.hint.has_value()) {
std::cout << prefix << *einfo.hint << std::endl;
std::cout << prefix << std::endl;
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}
}
}