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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)
/**
* YAML events.
* Code based on PyYAML: http://www.pyyaml.org
*/
module dyaml.event;
import std.array;
import std.conv;
import dyaml.exception;
import dyaml.reader;
import dyaml.tagdirective;
import dyaml.style;
package:
///Event types.
enum EventID : ubyte
{
invalid = 0, /// Invalid (uninitialized) event.
streamStart, /// Stream start
streamEnd, /// Stream end
documentStart, /// Document start
documentEnd, /// Document end
alias_, /// Alias
scalar, /// Scalar
sequenceStart, /// Sequence start
sequenceEnd, /// Sequence end
mappingStart, /// Mapping start
mappingEnd /// Mapping end
}
/**
* YAML event produced by parser.
*
* 48 bytes on 64bit.
*/
struct Event
{
@disable int opCmp(ref Event);
///Value of the event, if any.
string value;
///Start position of the event in file/stream.
Mark startMark;
///End position of the event in file/stream.
Mark endMark;
union
{
struct
{
///Anchor of the event, if any.
string _anchor;
///Tag of the event, if any.
string _tag;
}
///Tag directives, if this is a DocumentStart.
//TagDirectives tagDirectives;
TagDirective[] _tagDirectives;
}
///Event type.
EventID id = EventID.invalid;
///Style of scalar event, if this is a scalar event.
ScalarStyle scalarStyle = ScalarStyle.invalid;
union
{
///Should the tag be implicitly resolved?
bool implicit;
/**
* Is this document event explicit?
*
* Used if this is a DocumentStart or DocumentEnd.
*/
bool explicitDocument;
}
///Collection style, if this is a SequenceStart or MappingStart.
CollectionStyle collectionStyle = CollectionStyle.invalid;
///Is this a null (uninitialized) event?
@property bool isNull() const pure @safe nothrow {return id == EventID.invalid;}
///Get string representation of the token ID.
@property string idString() const @safe {return to!string(id);}
auto ref anchor() inout @trusted pure {
assert(id != EventID.documentStart, "DocumentStart events cannot have anchors.");
return _anchor;
}
auto ref tag() inout @trusted pure {
assert(id != EventID.documentStart, "DocumentStart events cannot have tags.");
return _tag;
}
auto ref tagDirectives() inout @trusted pure {
assert(id == EventID.documentStart, "Only DocumentStart events have tag directives.");
return _tagDirectives;
}
}
/**
* Construct a simple event.
*
* Params: start = Start position of the event in the file/stream.
* end = End position of the event in the file/stream.
* anchor = Anchor, if this is an alias event.
*/
Event event(EventID id)(const Mark start, const Mark end, const string anchor = null)
@safe
in(!(id == EventID.alias_ && anchor == ""), "Missing anchor for alias event")
{
Event result;
result.startMark = start;
result.endMark = end;
result.anchor = anchor;
result.id = id;
return result;
}
/**
* Construct a collection (mapping or sequence) start event.
*
* Params: start = Start position of the event in the file/stream.
* end = End position of the event in the file/stream.
* anchor = Anchor of the sequence, if any.
* tag = Tag of the sequence, if specified.
* implicit = Should the tag be implicitly resolved?
* style = Style to use when outputting document.
*/
Event collectionStartEvent(EventID id)
(const Mark start, const Mark end, const string anchor, const string tag,
const bool implicit, const CollectionStyle style) pure @safe nothrow
{
static assert(id == EventID.sequenceStart || id == EventID.sequenceEnd ||
id == EventID.mappingStart || id == EventID.mappingEnd);
Event result;
result.startMark = start;
result.endMark = end;
result.anchor = anchor;
result.tag = tag;
result.id = id;
result.implicit = implicit;
result.collectionStyle = style;
return result;
}
/**
* Construct a stream start event.
*
* Params: start = Start position of the event in the file/stream.
* end = End position of the event in the file/stream.
*/
Event streamStartEvent(const Mark start, const Mark end)
pure @safe nothrow
{
Event result;
result.startMark = start;
result.endMark = end;
result.id = EventID.streamStart;
return result;
}
///Aliases for simple events.
alias streamEndEvent = event!(EventID.streamEnd);
alias aliasEvent = event!(EventID.alias_);
alias sequenceEndEvent = event!(EventID.sequenceEnd);
alias mappingEndEvent = event!(EventID.mappingEnd);
///Aliases for collection start events.
alias sequenceStartEvent = collectionStartEvent!(EventID.sequenceStart);
alias mappingStartEvent = collectionStartEvent!(EventID.mappingStart);
/**
* Construct a document start event.
*
* Params: start = Start position of the event in the file/stream.
* end = End position of the event in the file/stream.
* explicit = Is this an explicit document start?
* YAMLVersion = YAML version string of the document.
* tagDirectives = Tag directives of the document.
*/
Event documentStartEvent(const Mark start, const Mark end, const bool explicit, string YAMLVersion,
TagDirective[] tagDirectives) pure @safe nothrow
{
Event result;
result.value = YAMLVersion;
result.startMark = start;
result.endMark = end;
result.id = EventID.documentStart;
result.explicitDocument = explicit;
result.tagDirectives = tagDirectives;
return result;
}
/**
* Construct a document end event.
*
* Params: start = Start position of the event in the file/stream.
* end = End position of the event in the file/stream.
* explicit = Is this an explicit document end?
*/
Event documentEndEvent(const Mark start, const Mark end, const bool explicit) pure @safe nothrow
{
Event result;
result.startMark = start;
result.endMark = end;
result.id = EventID.documentEnd;
result.explicitDocument = explicit;
return result;
}
/// Construct a scalar event.
///
/// Params: start = Start position of the event in the file/stream.
/// end = End position of the event in the file/stream.
/// anchor = Anchor of the scalar, if any.
/// tag = Tag of the scalar, if specified.
/// implicit = Should the tag be implicitly resolved?
/// value = String value of the scalar.
/// style = Scalar style.
Event scalarEvent(const Mark start, const Mark end, const string anchor, const string tag,
const bool implicit, const string value,
const ScalarStyle style = ScalarStyle.invalid) @safe pure nothrow @nogc
{
Event result;
result.value = value;
result.startMark = start;
result.endMark = end;
result.anchor = anchor;
result.tag = tag;
result.id = EventID.scalar;
result.scalarStyle = style;
result.implicit = implicit;
return result;
}
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