forked from lix-project/lix
386 lines
10 KiB
C++
386 lines
10 KiB
C++
#include "error.hh"
|
|
|
|
#include <iostream>
|
|
#include <optional>
|
|
#include "serialise.hh"
|
|
#include <sstream>
|
|
|
|
namespace nix {
|
|
|
|
|
|
const std::string nativeSystem = SYSTEM;
|
|
|
|
BaseError & BaseError::addTrace(std::optional<ErrPos> e, hintformat hint)
|
|
{
|
|
err.traces.push_front(Trace { .pos = e, .hint = hint});
|
|
return *this;
|
|
}
|
|
|
|
// 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 string& BaseError::calcWhat() const
|
|
{
|
|
if (what_.has_value())
|
|
return *what_;
|
|
else {
|
|
err.name = sname();
|
|
|
|
std::ostringstream oss;
|
|
showErrorInfo(oss, err, false);
|
|
what_ = oss.str();
|
|
|
|
return *what_;
|
|
}
|
|
}
|
|
|
|
std::optional<string> ErrorInfo::programName = std::nullopt;
|
|
|
|
std::ostream& operator<<(std::ostream &os, const hintformat &hf)
|
|
{
|
|
return os << hf.str();
|
|
}
|
|
|
|
string showErrPos(const ErrPos &errPos)
|
|
{
|
|
if (errPos.line > 0) {
|
|
if (errPos.column > 0) {
|
|
return fmt("(%1%:%2%)", errPos.line, errPos.column);
|
|
} else {
|
|
return fmt("(%1%)", 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 {
|
|
AutoCloseFD fd = open(errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
|
|
if (!fd) {
|
|
logError(SysError("opening file '%1%'", errPos.file).info());
|
|
return std::nullopt;
|
|
}
|
|
else
|
|
{
|
|
// count the newlines.
|
|
int count = 0;
|
|
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) {
|
|
printError("error reading nix file: %s\n%s", errPos.file, e.what());
|
|
return std::nullopt;
|
|
}
|
|
} else {
|
|
std::istringstream iss(errPos.file);
|
|
// count the newlines.
|
|
int count = 0;
|
|
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 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 string &prefix, const ErrPos &pos, std::ostream &out)
|
|
{
|
|
if (pos)
|
|
{
|
|
switch (pos.origin) {
|
|
case foFile: {
|
|
out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
|
|
ANSI_BLUE << " in file: " << ANSI_NORMAL << pos.file;
|
|
break;
|
|
}
|
|
case foString: {
|
|
out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
|
|
ANSI_BLUE << " from string" << ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case foStdin: {
|
|
out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
|
|
ANSI_BLUE << " from stdin" << ANSI_NORMAL;
|
|
break;
|
|
}
|
|
default:
|
|
throw Error("invalid FileOrigin in errPos");
|
|
}
|
|
}
|
|
}
|
|
|
|
std::ostream& showErrorInfo(std::ostream &out, const ErrorInfo &einfo, bool showTrace)
|
|
{
|
|
auto errwidth = std::max<size_t>(getWindowSize().second, 20);
|
|
string prefix = "";
|
|
|
|
string levelString;
|
|
switch (einfo.level) {
|
|
case Verbosity::lvlError: {
|
|
levelString = ANSI_RED;
|
|
levelString += "error:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlWarn: {
|
|
levelString = ANSI_YELLOW;
|
|
levelString += "warning:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlInfo: {
|
|
levelString = ANSI_GREEN;
|
|
levelString += "info:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlTalkative: {
|
|
levelString = ANSI_GREEN;
|
|
levelString += "talk:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlChatty: {
|
|
levelString = ANSI_GREEN;
|
|
levelString += "chat:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlVomit: {
|
|
levelString = ANSI_GREEN;
|
|
levelString += "vomit:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
case Verbosity::lvlDebug: {
|
|
levelString = ANSI_YELLOW;
|
|
levelString += "debug:";
|
|
levelString += ANSI_NORMAL;
|
|
break;
|
|
}
|
|
default: {
|
|
levelString = fmt("invalid error level: %1%", einfo.level);
|
|
break;
|
|
}
|
|
}
|
|
|
|
auto ndl = prefix.length()
|
|
+ filterANSIEscapes(levelString, true).length()
|
|
+ 7
|
|
+ einfo.name.length()
|
|
+ einfo.programName.value_or("").length();
|
|
auto dashwidth = std::max<int>(errwidth - ndl, 3);
|
|
|
|
std::string dashes(dashwidth, '-');
|
|
|
|
// divider.
|
|
if (einfo.name != "")
|
|
out << fmt("%1%%2%" ANSI_BLUE " --- %3% %4% %5%" ANSI_NORMAL,
|
|
prefix,
|
|
levelString,
|
|
einfo.name,
|
|
dashes,
|
|
einfo.programName.value_or(""));
|
|
else
|
|
out << fmt("%1%%2%" ANSI_BLUE " -----%3% %4%" ANSI_NORMAL,
|
|
prefix,
|
|
levelString,
|
|
dashes,
|
|
einfo.programName.value_or(""));
|
|
|
|
bool nl = false; // intersperse newline between sections.
|
|
if (einfo.errPos.has_value() && (*einfo.errPos)) {
|
|
out << prefix << std::endl;
|
|
printAtPos(prefix, *einfo.errPos, out);
|
|
nl = true;
|
|
}
|
|
|
|
// description
|
|
if (einfo.description != "") {
|
|
if (nl)
|
|
out << std::endl << prefix;
|
|
out << std::endl << prefix << einfo.description;
|
|
nl = true;
|
|
}
|
|
|
|
if (einfo.errPos.has_value() && (*einfo.errPos)) {
|
|
auto loc = getCodeLines(*einfo.errPos);
|
|
|
|
// lines of code.
|
|
if (loc.has_value()) {
|
|
if (nl)
|
|
out << std::endl << prefix;
|
|
printCodeLines(out, prefix, *einfo.errPos, *loc);
|
|
nl = true;
|
|
}
|
|
}
|
|
|
|
// hint
|
|
if (einfo.hint.has_value()) {
|
|
if (nl)
|
|
out << std::endl << prefix;
|
|
out << std::endl << prefix << *einfo.hint;
|
|
nl = true;
|
|
}
|
|
|
|
// traces
|
|
if (showTrace && !einfo.traces.empty())
|
|
{
|
|
const string tracetitle(" show-trace ");
|
|
|
|
int fill = errwidth - tracetitle.length();
|
|
int lw = 0;
|
|
int rw = 0;
|
|
const int min_dashes = 3;
|
|
if (fill > min_dashes * 2) {
|
|
if (fill % 2 != 0) {
|
|
lw = fill / 2;
|
|
rw = lw + 1;
|
|
}
|
|
else
|
|
{
|
|
lw = rw = fill / 2;
|
|
}
|
|
}
|
|
else
|
|
lw = rw = min_dashes;
|
|
|
|
if (nl)
|
|
out << std::endl << prefix;
|
|
|
|
out << ANSI_BLUE << std::string(lw, '-') << tracetitle << std::string(rw, '-') << ANSI_NORMAL;
|
|
|
|
for (auto iter = einfo.traces.rbegin(); iter != einfo.traces.rend(); ++iter)
|
|
{
|
|
try {
|
|
out << std::endl << prefix;
|
|
out << ANSI_BLUE << "trace: " << ANSI_NORMAL << iter->hint.str();
|
|
|
|
nl = true;
|
|
if (*iter->pos) {
|
|
auto pos = iter->pos.value();
|
|
out << std::endl << prefix;
|
|
|
|
printAtPos(prefix, pos, out);
|
|
auto loc = getCodeLines(pos);
|
|
if (loc.has_value())
|
|
{
|
|
out << std::endl << prefix;
|
|
printCodeLines(out, prefix, pos, *loc);
|
|
out << std::endl << prefix;
|
|
}
|
|
}
|
|
} catch(const std::bad_optional_access& e) {
|
|
out << iter->hint.str() << std::endl;
|
|
}
|
|
}
|
|
}
|
|
|
|
return out;
|
|
}
|
|
}
|