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