forked from lix-project/lix
add some explanatory comments
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9e7b89bf10
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@ -152,12 +152,14 @@ void printErrorInfo(ErrorInfo &einfo)
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// lines of code.
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// lines of code.
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if (einfo.nixCode.has_value())
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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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printCodeLines(prefix, *einfo.nixCode);
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cout << prefix << endl;
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}
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// hint
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// hint
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if (einfo.hint.has_value())
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if (einfo.hint.has_value())
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{
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{
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cout << prefix << endl;
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cout << prefix << *einfo.hint << endl;
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cout << prefix << *einfo.hint << endl;
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cout << prefix << endl;
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cout << prefix << endl;
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}
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}
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@ -257,6 +257,7 @@ typedef AddName<
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AddDescription<
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AddDescription<
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AddHint<
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AddHint<
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EIError>>> ProgramError;
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EIError>>> ProgramError;
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typedef AddName<
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typedef AddName<
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AddDescription<
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AddDescription<
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AddHint<
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AddHint<
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@ -270,6 +271,7 @@ typedef AddName<
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AddLOC<
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AddLOC<
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AddHint<
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AddHint<
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EIError>>>>>>> NixLangError;
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EIError>>>>>>> NixLangError;
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typedef AddName<
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typedef AddName<
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AddDescription<
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AddDescription<
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AddNixFile<
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AddNixFile<
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@ -8,48 +8,67 @@ using std::nullopt;
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using std::cout;
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using std::cout;
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using std::endl;
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using std::endl;
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int main()
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int main()
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{
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{
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using namespace nix;
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using namespace nix;
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// In each program where errors occur, this has to be set.
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ErrorInfo::programName = optional("error-test");
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ErrorInfo::programName = optional("error-test");
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printErrorInfo(ProgramError()
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// There are currently four error types -
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.name("name")
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// ProgramError, ProgramWarning, NixLangError, NixLangWarning.
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.description("error description")
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// Each error type is created with a specific sequence of builder functions.
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.nohint()
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// Unlike with a constructor, each parameter is clearly named.
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);
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// If the sequence of function calls isn't followed, then there's a type error.
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// This should make for a consistent look in the code when errors are created.
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printErrorInfo(ProgramWarning()
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// ProgramError takes name, description, and an optional hint.
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.name("warning name")
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printErrorInfo(
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.description("warning description")
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ProgramError()
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.nohint()
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.name("name")
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);
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.description("error description")
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.nohint()
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);
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// ProgramWarning takes name, description, and an optional hint.
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// The hint is in the form of a hintfmt class, which wraps boost::format(), and
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// makes all the substituted text yellow.
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printErrorInfo(
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ProgramWarning()
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.name("warning name")
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.description("warning description")
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.hint(hintfmt("there was a %1%") % "warning") // 'warning' will be yellow.
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);
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printErrorInfo(NixLangWarning()
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// NixLangWarning adds nix file, line number, column range, and the lines of code
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.name("warning name")
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// where a warning occurred.
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.description("warning description")
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printErrorInfo(
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.nixFile("myfile.nix")
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NixLangWarning()
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.lineNumber(40)
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.name("warning name")
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.columnRange(13,7)
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.description("warning description")
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.linesOfCode(nullopt
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.nixFile("myfile.nix")
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,"this is the problem line of code"
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.lineNumber(40)
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,nullopt)
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.columnRange(13,7)
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.hint(hintfmt("this hint has %1% templated %2%!!") % "yellow" % "values")
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.linesOfCode(nullopt
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);
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,"this is the problem line of code"
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,nullopt)
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.hint(hintfmt("this hint has %1% templated %2%!!") % "yellow" % "values")
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);
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printErrorInfo(NixLangError()
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// NixLangError is just the same as NixLangWarning, except for the Error flag.
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.name("error name")
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printErrorInfo(
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.description("error description")
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NixLangError()
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.nixFile("myfile.nix")
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.name("error name")
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.lineNumber(40)
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.description("error description")
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.columnRange(13,7)
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.nixFile("myfile.nix")
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.linesOfCode(optional("previous line of code")
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.lineNumber(40)
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,"this is the problem line of code"
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.columnRange(13,7)
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,optional("next line of code"))
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.linesOfCode(optional("previous line of code")
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.hint(hintfmt("this hint has %1% templated %2%!!") % "yellow" % "values")
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,"this is the problem line of code"
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);
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,optional("next line of code"))
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.hint(hintfmt("this hint has %1% templated %2%!!") % "yellow" % "values")
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);
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return 0;
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return 0;
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}
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}
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