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// Copyright Ferdinand Majerech 2011.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
///Exceptions thrown by D:YAML and _exception related code.
module dyaml.exception;
import std.algorithm;
import std.array;
import std.conv;
import std.exception;
import std.format;
import std.range;
import std.string;
import std.typecons;
/// Base class for all exceptions thrown by D:YAML.
class YAMLException : Exception
{
mixin basicExceptionCtors;
}
/// Position in a YAML stream, used for error messages.
struct Mark
{
/// File name.
string name = "<unknown>";
/// Line number.
ushort line;
/// Column number.
ushort column;
public:
/// Construct a Mark with specified line and column in the file.
this(string name, const uint line, const uint column) @safe pure nothrow @nogc
{
this.name = name;
this.line = cast(ushort)min(ushort.max, line);
// This *will* overflow on extremely wide files but saves CPU time
// (mark ctor takes ~5% of time)
this.column = cast(ushort)column;
}
/// Get a string representation of the mark.
void toString(W)(ref W writer) const scope
{
// Line/column numbers start at zero internally, make them start at 1.
void writeClamped(ushort v)
{
writer.formattedWrite!"%s"(v + 1);
if (v == ushort.max)
{
put(writer, "or higher");
}
}
put(writer, name);
put(writer, ":");
writeClamped(line);
put(writer, ",");
writeClamped(column);
}
}
/// Base class of YAML exceptions with marked positions of the problem.
abstract class MarkedYAMLException : YAMLException
{
/// Position of the error.
Mark mark;
/// Additional position information, usually the start of a token or scalar
Nullable!Mark mark2;
/// A label for the extra information
string mark2Label;
// Construct a MarkedYAMLException with two marks
this(string context, const Mark mark, string mark2Label, const Nullable!Mark mark2,
string file = __FILE__, size_t line = __LINE__) @safe pure nothrow
{
super(context, file, line);
this.mark = mark;
this.mark2 = mark2;
this.mark2Label = mark2Label;
}
// Construct a MarkedYAMLException with specified problem.
this(string msg, const Mark mark,
string file = __FILE__, size_t line = __LINE__)
@safe pure nothrow
{
super(msg, file, line);
this.mark = mark;
}
/// Custom toString to add context without requiring allocation up-front
void toString(W)(ref W sink) const
{
sink.formattedWrite!"%s@%s(%s): "(typeid(this).name, file, line);
put(sink, msg);
put(sink, "\n");
mark.toString(sink);
if (!mark2.isNull)
{
put(sink, "\n");
put(sink, mark2Label);
put(sink, ":");
mark2.get.toString(sink);
}
put(sink, "\n");
put(sink, info.toString());
}
/// Ditto
override void toString(scope void delegate(in char[]) sink) const
{
toString!(typeof(sink))(sink);
}
/// An override of message
override const(char)[] message() const @safe nothrow
{
if (mark2.isNull)
{
return assertNotThrown(text(msg, "\n", mark));
}
else
{
return assertNotThrown(text(msg, "\n", mark, "\n", mark2Label, ": ", mark2.get));
}
}
}
/// Exception thrown on composer errors.
class ComposerException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on constructor errors.
class ConstructorException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on loader errors.
class LoaderException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on node related errors.
class NodeException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on parser errors.
class ParserException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on Reader errors.
class ReaderException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
/// Exception thrown on Representer errors.
class RepresenterException : YAMLException
{
mixin basicExceptionCtors;
}
/// Exception thrown on scanner errors.
class ScannerException : MarkedYAMLException
{
mixin MarkedExceptionCtors;
}
private:
/// Constructors of marked YAML exceptions are identical, so we use a mixin.
///
/// See_Also: MarkedYAMLException
template MarkedExceptionCtors()
{
public:
this(string msg, const Mark mark1, string mark2Label,
const Mark mark2, string file = __FILE__, size_t line = __LINE__)
@safe pure nothrow
{
super(msg, mark1, mark2Label, Nullable!Mark(mark2), file, line);
}
this(string msg, const Mark mark,
string file = __FILE__, size_t line = __LINE__)
@safe pure nothrow
{
super(msg, mark, file, line);
}
this(string msg, const Mark mark1, string mark2Label,
const Nullable!Mark mark2, string file = __FILE__, size_t line = __LINE__)
@safe pure nothrow
{
super(msg, mark1, mark2Label, mark2, file, line);
}
}
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