forked from lix-project/lix
143 lines
3.9 KiB
C++
143 lines
3.9 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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{
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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) {
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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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}
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void printCodeLines(const string &prefix, const ErrorInfo &einfo)
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{
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if (einfo.errPos.has_value()) {
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// previous line of code.
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if (einfo.prevLineOfCode.has_value()) {
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std::cout << format("%1% %|2$5d|| %3%")
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% prefix
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% (einfo.errPos->lineNumber - 1)
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% *einfo.prevLineOfCode
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<< std::endl;
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}
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// line of code containing the error.%2$+5d%
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std::cout << format("%1% %|2$5d|| %3%")
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% prefix
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% (einfo.errPos->lineNumber)
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% einfo.errLineOfCode
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<< std::endl;
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// error arrows for the column range.
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if (einfo.errPos->column > 0) {
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int start = einfo.errPos->column;
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std::string spaces;
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for (int i = 0; i < start; ++i) {
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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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}
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// next line of code.
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if (einfo.nextLineOfCode.has_value()) {
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std::cout << format("%1% %|2$5d|| %3%")
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% prefix
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% (einfo.errPos->lineNumber + 1)
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% *einfo.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(const 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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case ErrLevel::elError: {
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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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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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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.errPos.has_value()) {
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if (einfo.errPos->nixFile != "") {
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string eline = einfo.errLineOfCode != ""
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? string(" ") + showErrPos(*einfo.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.errPos->nixFile % eline << std::endl;
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std::cout << prefix << std::endl;
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} else {
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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.errLineOfCode != "") {
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printCodeLines(prefix, einfo);
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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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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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