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Introduce AbstractPos

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This makes the position object used in exceptions abstract, with a
method getSource() to get the source code of the file in which the
error originated. This is needed for lazy trees because source files
don't necessarily exist in the filesystem, and we don't want to make
libutil depend on the InputAccessor type in libfetcher.
This commit is contained in:
Eelco Dolstra 2022-12-13 00:48:04 +01:00
parent edb54c62e6
commit b3fdab28a2
16 changed files with 231 additions and 279 deletions
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142
src/libutil/error.cc
View file

@ -9,9 +9,9 @@ namespace nix {
const std::string nativeSystem = SYSTEM;
void BaseError::addTrace(std::optional<ErrPos> e, hintformat hint)
void BaseError::addTrace(std::shared_ptr<AbstractPos> && e, hintformat hint)
{
err.traces.push_front(Trace { .pos = e, .hint = hint });
err.traces.push_front(Trace { .pos = std::move(e), .hint = hint });
}
// c++ std::exception descendants must have a 'const char* what()' function.
@ -30,91 +30,46 @@ const std::string & BaseError::calcWhat() const
std::optional<std::string> ErrorInfo::programName = std::nullopt;
std::ostream & operator<<(std::ostream & os, const hintformat & hf)
std::ostream & operator <<(std::ostream & os, const hintformat & hf)
{
return os << hf.str();
}
std::string showErrPos(const ErrPos & errPos)
std::ostream & operator <<(std::ostream & str, const AbstractPos & pos)
{
if (errPos.line > 0) {
if (errPos.column > 0) {
return fmt("%d:%d", errPos.line, errPos.column);
} else {
return fmt("%d", errPos.line);
}
}
else {
return "";
}
pos.print(str);
str << ":" << pos.line;
if (pos.column > 0)
str << ":" << pos.column;
return str;
}
std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
std::optional<LinesOfCode> AbstractPos::getCodeLines() const
{
if (errPos.line <= 0)
if (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 {};
if (auto source = getSource()) {
// 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);
std::istringstream iss(*source);
// count the newlines.
int count = 0;
std::string line;
int pl = errPos.line - 1;
std::string curLine;
int pl = line - 1;
LinesOfCode loc;
do
{
std::getline(iss, line);
do {
std::getline(iss, curLine);
++count;
if (count < pl)
{
;
}
else if (count == pl) {
loc.prevLineOfCode = line;
loc.prevLineOfCode = curLine;
} else if (count == pl + 1) {
loc.errLineOfCode = line;
loc.errLineOfCode = curLine;
} else if (count == pl + 2) {
loc.nextLineOfCode = line;
loc.nextLineOfCode = curLine;
break;
}
@ -124,12 +79,14 @@ std::optional<LinesOfCode> getCodeLines(const ErrPos & errPos)
return loc;
}
return std::nullopt;
}
// print lines of code to the ostream, indicating the error column.
void printCodeLines(std::ostream & out,
const std::string & prefix,
const ErrPos & errPos,
const AbstractPos & errPos,
const LinesOfCode & loc)
{
// previous line of code.
@ -176,28 +133,6 @@ void printCodeLines(std::ostream & out,
}
}
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;
@ -263,22 +198,22 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
std::ostringstream oss;
auto noSource = ANSI_ITALIC " (source not available)" ANSI_NORMAL "\n";
// traces
if (showTrace && !einfo.traces.empty()) {
for (const auto & trace : einfo.traces) {
oss << "\n" << "… " << trace.hint.str() << "\n";
if (trace.pos.has_value() && (*trace.pos)) {
auto pos = trace.pos.value();
oss << "\n";
printAtPos(pos, oss);
if (trace.pos) {
oss << "\n" << ANSI_BLUE << "at " ANSI_WARNING << *trace.pos << ANSI_NORMAL << ":";
auto loc = getCodeLines(pos);
if (loc.has_value()) {
if (auto loc = trace.pos->getCodeLines()) {
oss << "\n";
printCodeLines(oss, "", pos, *loc);
printCodeLines(oss, "", *trace.pos, *loc);
oss << "\n";
}
} else
oss << noSource;
}
}
oss << "\n" << prefix;
@ -286,22 +221,19 @@ std::ostream & showErrorInfo(std::ostream & out, const ErrorInfo & einfo, bool s
oss << einfo.msg << "\n";
if (einfo.errPos.has_value() && *einfo.errPos) {
oss << "\n";
printAtPos(*einfo.errPos, oss);
if (einfo.errPos) {
oss << "\n" << ANSI_BLUE << "at " ANSI_WARNING << *einfo.errPos << ANSI_NORMAL << ":";
auto loc = getCodeLines(*einfo.errPos);
// lines of code.
if (loc.has_value()) {
if (auto loc = einfo.errPos->getCodeLines()) {
oss << "\n";
printCodeLines(oss, "", *einfo.errPos, *loc);
oss << "\n";
}
} else
oss << noSource;
}
auto suggestions = einfo.suggestions.trim();
if (! suggestions.suggestions.empty()){
if (!suggestions.suggestions.empty()) {
oss << "Did you mean " <<
suggestions.trim() <<
"?" << std::endl;