forked from lix-project/lix
313 lines
8.3 KiB
C++
313 lines
8.3 KiB
C++
#include "error.hh"
|
|
|
|
#include <iostream>
|
|
#include <optional>
|
|
#include "serialise.hh"
|
|
#include <sstream>
|
|
|
|
namespace nix {
|
|
|
|
const std::string nativeSystem = SYSTEM;
|
|
|
|
void BaseError::addTrace(std::optional<ErrPos> e, hintformat hint)
|
|
{
|
|
err.traces.push_front(Trace { .pos = e, .hint = hint });
|
|
}
|
|
|
|
// c++ std::exception descendants must have a 'const char* what()' function.
|
|
// This stringifies the error and caches it for use by what(), or similarly by msg().
|
|
const std::string & BaseError::calcWhat() const
|
|
{
|
|
if (what_.has_value())
|
|
return *what_;
|
|
else {
|
|
std::ostringstream oss;
|
|
showErrorInfo(oss, err, loggerSettings.showTrace);
|
|
what_ = oss.str();
|
|
return *what_;
|
|
}
|
|
}
|
|
|
|
std::optional<std::string> ErrorInfo::programName = std::nullopt;
|
|
|
|
std::ostream & operator<<(std::ostream & os, const hintformat & hf)
|
|
{
|
|
return os << hf.str();
|
|
}
|
|
|
|
std::string showErrPos(const ErrPos & errPos)
|
|
{
|
|
if (errPos.line > 0) {
|
|
if (errPos.column > 0) {
|
|
return fmt("%d:%d", errPos.line, errPos.column);
|
|
} else {
|
|
return fmt("%d", errPos.line);
|
|
}
|
|
}
|
|
else {
|
|
return "";
|
|
}
|
|
}
|
|
|
|
std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
|
|
{
|
|
if (errPos.line <= 0)
|
|
return std::nullopt;
|
|
|
|
if (errPos.origin == foFile) {
|
|
LinesOfCode loc;
|
|
try {
|
|
// FIXME: when running as the daemon, make sure we don't
|
|
// open a file to which the client doesn't have access.
|
|
AutoCloseFD fd = open(errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
|
|
if (!fd) return {};
|
|
|
|
// count the newlines.
|
|
int count = 0;
|
|
std::string line;
|
|
int pl = errPos.line - 1;
|
|
do
|
|
{
|
|
line = readLine(fd.get());
|
|
++count;
|
|
if (count < pl)
|
|
;
|
|
else if (count == pl)
|
|
loc.prevLineOfCode = line;
|
|
else if (count == pl + 1)
|
|
loc.errLineOfCode = line;
|
|
else if (count == pl + 2) {
|
|
loc.nextLineOfCode = line;
|
|
break;
|
|
}
|
|
} while (true);
|
|
return loc;
|
|
}
|
|
catch (EndOfFile & eof) {
|
|
if (loc.errLineOfCode.has_value())
|
|
return loc;
|
|
else
|
|
return std::nullopt;
|
|
}
|
|
catch (std::exception & e) {
|
|
return std::nullopt;
|
|
}
|
|
} else {
|
|
std::istringstream iss(errPos.file);
|
|
// count the newlines.
|
|
int count = 0;
|
|
std::string line;
|
|
int pl = errPos.line - 1;
|
|
|
|
LinesOfCode loc;
|
|
|
|
do
|
|
{
|
|
std::getline(iss, line);
|
|
++count;
|
|
if (count < pl)
|
|
{
|
|
;
|
|
}
|
|
else if (count == pl) {
|
|
loc.prevLineOfCode = line;
|
|
} else if (count == pl + 1) {
|
|
loc.errLineOfCode = line;
|
|
} else if (count == pl + 2) {
|
|
loc.nextLineOfCode = line;
|
|
break;
|
|
}
|
|
|
|
if (!iss.good())
|
|
break;
|
|
} while (true);
|
|
|
|
return loc;
|
|
}
|
|
}
|
|
|
|
// print lines of code to the ostream, indicating the error column.
|
|
void printCodeLines(std::ostream & out,
|
|
const std::string & prefix,
|
|
const ErrPos & errPos,
|
|
const LinesOfCode & loc)
|
|
{
|
|
// previous line of code.
|
|
if (loc.prevLineOfCode.has_value()) {
|
|
out << std::endl
|
|
<< fmt("%1% %|2$5d|| %3%",
|
|
prefix,
|
|
(errPos.line - 1),
|
|
*loc.prevLineOfCode);
|
|
}
|
|
|
|
if (loc.errLineOfCode.has_value()) {
|
|
// line of code containing the error.
|
|
out << std::endl
|
|
<< fmt("%1% %|2$5d|| %3%",
|
|
prefix,
|
|
(errPos.line),
|
|
*loc.errLineOfCode);
|
|
// error arrows for the column range.
|
|
if (errPos.column > 0) {
|
|
int start = errPos.column;
|
|
std::string spaces;
|
|
for (int i = 0; i < start; ++i) {
|
|
spaces.append(" ");
|
|
}
|
|
|
|
std::string arrows("^");
|
|
|
|
out << std::endl
|
|
<< fmt("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL,
|
|
prefix,
|
|
spaces,
|
|
arrows);
|
|
}
|
|
}
|
|
|
|
// next line of code.
|
|
if (loc.nextLineOfCode.has_value()) {
|
|
out << std::endl
|
|
<< fmt("%1% %|2$5d|| %3%",
|
|
prefix,
|
|
(errPos.line + 1),
|
|
*loc.nextLineOfCode);
|
|
}
|
|
}
|
|
|
|
void printAtPos(const ErrPos & pos, std::ostream & out)
|
|
{
|
|
if (pos) {
|
|
switch (pos.origin) {
|
|
case foFile: {
|
|
out << fmt(ANSI_BLUE "at " ANSI_WARNING "%s:%s" ANSI_NORMAL ":", pos.file, showErrPos(pos));
|
|
break;
|
|
}
|
|
case foString: {
|
|
out << fmt(ANSI_BLUE "at " ANSI_WARNING "«string»:%s" ANSI_NORMAL ":", showErrPos(pos));
|
|
break;
|
|
}
|
|
case foStdin: {
|
|
out << fmt(ANSI_BLUE "at " ANSI_WARNING "«stdin»:%s" ANSI_NORMAL ":", showErrPos(pos));
|
|
break;
|
|
}
|
|
default:
|
|
throw Error("invalid FileOrigin in errPos");
|
|
}
|
|
}
|
|
}
|
|
|
|
static std::string indent(std::string_view indentFirst, std::string_view indentRest, std::string_view s)
|
|
{
|
|
std::string res;
|
|
bool first = true;
|
|
|
|
while (!s.empty()) {
|
|
auto end = s.find('\n');
|
|
if (!first) res += "\n";
|
|
res += chomp(std::string(first ? indentFirst : indentRest) + std::string(s.substr(0, end)));
|
|
first = false;
|
|
if (end == s.npos) break;
|
|
s = s.substr(end + 1);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool showTrace)
|
|
{
|
|
std::string prefix;
|
|
switch (einfo.level) {
|
|
case Verbosity::lvlError: {
|
|
prefix = ANSI_RED "error";
|
|
break;
|
|
}
|
|
case Verbosity::lvlNotice: {
|
|
prefix = ANSI_RED "note";
|
|
break;
|
|
}
|
|
case Verbosity::lvlWarn: {
|
|
prefix = ANSI_WARNING "warning";
|
|
break;
|
|
}
|
|
case Verbosity::lvlInfo: {
|
|
prefix = ANSI_GREEN "info";
|
|
break;
|
|
}
|
|
case Verbosity::lvlTalkative: {
|
|
prefix = ANSI_GREEN "talk";
|
|
break;
|
|
}
|
|
case Verbosity::lvlChatty: {
|
|
prefix = ANSI_GREEN "chat";
|
|
break;
|
|
}
|
|
case Verbosity::lvlVomit: {
|
|
prefix = ANSI_GREEN "vomit";
|
|
break;
|
|
}
|
|
case Verbosity::lvlDebug: {
|
|
prefix = ANSI_WARNING "debug";
|
|
break;
|
|
}
|
|
default:
|
|
assert(false);
|
|
}
|
|
|
|
// FIXME: show the program name as part of the trace?
|
|
if (einfo.programName && einfo.programName != ErrorInfo::programName)
|
|
prefix += fmt(" [%s]:" ANSI_NORMAL " ", einfo.programName.value_or(""));
|
|
else
|
|
prefix += ":" ANSI_NORMAL " ";
|
|
|
|
std::ostringstream oss;
|
|
oss << einfo.msg << "\n";
|
|
|
|
if (einfo.errPos.has_value() && *einfo.errPos) {
|
|
oss << "\n";
|
|
printAtPos(*einfo.errPos, oss);
|
|
|
|
auto loc = getCodeLines(*einfo.errPos);
|
|
|
|
// lines of code.
|
|
if (loc.has_value()) {
|
|
oss << "\n";
|
|
printCodeLines(oss, "", *einfo.errPos, *loc);
|
|
oss << "\n";
|
|
}
|
|
}
|
|
|
|
auto suggestions = einfo.suggestions.trim();
|
|
if (! suggestions.suggestions.empty()){
|
|
oss << "Did you mean " <<
|
|
suggestions.trim() <<
|
|
"?" << std::endl;
|
|
}
|
|
|
|
// traces
|
|
if (showTrace && !einfo.traces.empty()) {
|
|
for (auto iter = einfo.traces.rbegin(); iter != einfo.traces.rend(); ++iter) {
|
|
oss << "\n" << "… " << iter->hint.str() << "\n";
|
|
|
|
if (iter->pos.has_value() && (*iter->pos)) {
|
|
auto pos = iter->pos.value();
|
|
oss << "\n";
|
|
printAtPos(pos, oss);
|
|
|
|
auto loc = getCodeLines(pos);
|
|
if (loc.has_value()) {
|
|
oss << "\n";
|
|
printCodeLines(oss, "", pos, *loc);
|
|
oss << "\n";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
out << indent(prefix, std::string(filterANSIEscapes(prefix, true).size(), ' '), chomp(oss.str()));
|
|
|
|
return out;
|
|
}
|
|
}
|