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#ifndef _AST__PATTERN_HPP_INCLUDED_
#define _AST__PATTERN_HPP_INCLUDED_
#include <vector>
#include <memory>
#include <string>
#include <tagged_union.hpp>
namespace AST {
using ::std::unique_ptr;
using ::std::move;
class ExprNode;
class Pattern:
public Serialisable
{
public:
TAGGED_UNION(Data, Any,
(Any, () ),
(MaybeBind, () ),
(Ref, (bool mut; unique_ptr<Pattern> sub;) ),
(Value, (unique_ptr<ExprNode> start; unique_ptr<ExprNode> end;) ),
(Tuple, (::std::vector<Pattern> sub_patterns;) ),
(StructTuple, (Path path; ::std::vector<Pattern> sub_patterns;) ),
(Struct, (Path path; ::std::vector< ::std::pair< ::std::string,Pattern> > sub_patterns;) )
);
private:
::std::string m_binding;
Data m_data;
public:
Pattern()
{}
// Wildcard = '..', distinct from '_'
// TODO: Store wildcard as a different pattern type
struct TagWildcard {};
Pattern(TagWildcard)
{}
struct TagBind {};
Pattern(TagBind, ::std::string name):
m_binding(name)
{}
struct TagMaybeBind {};
Pattern(TagMaybeBind, ::std::string name):
m_binding(name),
m_data( Data::make_MaybeBind({}) )
{}
struct TagValue {};
Pattern(TagValue, unique_ptr<ExprNode> node, unique_ptr<ExprNode> node2 = 0):
m_data( Data::make_Value({ ::std::move(node), ::std::move(node2) }) )
{}
struct TagReference {};
Pattern(TagReference, Pattern sub_pattern):
m_data( Data::make_Ref( /*Data::Data_Ref */ {
false, unique_ptr<Pattern>(new Pattern(::std::move(sub_pattern)))
}) )
{
}
struct TagTuple {};
Pattern(TagTuple, ::std::vector<Pattern> sub_patterns):
m_data( Data::make_Tuple( { ::std::move(sub_patterns) } ) )
{}
struct TagEnumVariant {};
Pattern(TagEnumVariant, Path path, ::std::vector<Pattern> sub_patterns):
m_data( Data::make_StructTuple( { ::std::move(path), ::std::move(sub_patterns) } ) )
{}
struct TagStruct {};
Pattern(TagStruct, Path path, ::std::vector< ::std::pair< ::std::string,Pattern> > sub_patterns):
m_data( Data::make_Struct( { ::std::move(path), ::std::move(sub_patterns) } ) )
{}
// Mutators
void set_bind(::std::string name, bool is_ref, bool is_mut) {
m_binding = name;
}
::std::unique_ptr<ExprNode> take_node() {
assert(m_data.is_Value());
return ::std::move(m_data.unwrap_Value().start);
}
// Accessors
const ::std::string& binding() const { return m_binding; }
Data& data() { return m_data; }
const Data& data() const { return m_data; }
ExprNode& node() {
return *m_data.as_Value().start;
}
const ExprNode& node() const {
return *m_data.as_Value().start;
}
Path& path() { return m_data.as_StructTuple().path; }
const Path& path() const { return m_data.as_StructTuple().path; }
friend ::std::ostream& operator<<(::std::ostream& os, const Pattern& pat);
SERIALISABLE_PROTOTYPES();
static ::std::unique_ptr<Pattern> from_deserialiser(Deserialiser& s) {
::std::unique_ptr<Pattern> ret(new Pattern);
s.item(*ret);
return ::std::move(ret);
}
};
};
#endif
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