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