forked from lix-project/lix
63 lines
2 KiB
C++
63 lines
2 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 constructor functions:
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//
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// ProgramError, ProgramWarning, NixLangError, NixLangWarning.
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//
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// ProgramError takes name, description, and an optional hint.
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printErrorInfo(
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ErrorInfo::ProgramError("name",
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"error description",
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std::nullopt));
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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(
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ErrorInfo::ProgramWarning("name",
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"warning description",
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std::optional(
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hintfmt("there was a %1%", "warning"))));
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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(
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ErrorInfo::NixLangWarning(
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"warning name",
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"warning description",
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Pos(problem_symbol, 40, 13),
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std::nullopt,
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"this is the problem line of code",
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std::nullopt,
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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(
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ErrorInfo::NixLangError(
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"error name",
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"error description",
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Pos(problem_symbol, 40, 13),
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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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hintfmt("this hint has %1% templated %2%!!", "yellow", "values")));
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return 0;
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}
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