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87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
#include "error.hh"
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#include "nixexpr.hh"
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#include <iostream>
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#include <optional>
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int main()
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{
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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 = std::optional("error-demo");
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// There are currently four error types:
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//
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// ProgramError, ProgramWarning, NixLangError, NixLangWarning.
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//
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// Each error type is created with a specific sequence of builder functions.
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// Unlike with a constructor, each parameter is clearly named.
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// If the sequence of function calls isn't followed, then there's a type
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// error. This should make for a consistent look in the code when errors are
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// created.
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// ProgramError takes name, description, and an optional hint.
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printErrorInfo( ProgramError()
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.name("name")
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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(),
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// and makes all the substituted text yellow.
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printErrorInfo( ProgramWarning()
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.name("warning name")
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.description("warning description")
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// the templated value, 'warning', is automatically colored yellow.
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.hint(hintfmt("there was a %1%", "warning"))
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);
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/*
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// some invalid errors:
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// type error: no hint function.
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ProgramError()
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.name("name")
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.description("error description");
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// type error: description before name.
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ProgramError()
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.description("error description")
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.name("name")
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.nohint();
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// type error: hint function with regular boost format, not special
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hintfmt. ProgramError() .description("error description") .name("name")
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.hint(format("there was a %1%") % "warning");
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*/
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// NixLangWarning adds nix file, line number, column range, and the lines of
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// code where a warning occurred.
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SymbolTable testTable;
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auto problem_symbol = testTable.create("problem");
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printErrorInfo(NixLangWarning()
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.name("warning name")
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.description("warning description")
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.pos(Pos(problem_symbol, 40, 13))
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.linesOfCode(std::nullopt,
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"this is the problem line of code",
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std::nullopt)
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.hint(hintfmt("this hint has %1% templated %2%!!", "yellow" , "values")));
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// NixLangError is just the same as NixLangWarning, except for the Error
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// flag.
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printErrorInfo(NixLangError()
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.name("error name")
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.description("error description")
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.pos(Pos(problem_symbol, 40, 13))
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.linesOfCode(std::optional("previous line of code"),
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"this is the problem line of code",
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std::optional("next line of code"))
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.hint(hintfmt("this hint has %1% templated %2%!!", "yellow", "values")));
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return 0;
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}
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