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#ifndef _AST__PATTERN_HPP_INCLUDED_
#define _AST__PATTERN_HPP_INCLUDED_
#include <vector>
#include <memory>
#include <string>
#include <tagged_enum.hpp>
namespace AST {
using ::std::unique_ptr;
using ::std::move;
class ExprNode;
class Pattern:
public Serialisable
{
public:
enum BindType {
MAYBE_BIND,
ANY,
REF,
VALUE,
TUPLE,
TUPLE_STRUCT,
};
private:
BindType m_class;
::std::string m_binding;
Path m_path;
unique_ptr<ExprNode> m_node;
unique_ptr<ExprNode> m_node2; // ONLY used for range values
::std::vector<Pattern> m_sub_patterns;
TAGGED_ENUM(Data, Any,
(Any, () ),
(Ref, (bool mut; unique_ptr<ExprNode> 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;) )
);
public:
Pattern(Pattern&& o) noexcept:
m_class(o.m_class),
m_binding( move(o.m_binding) ),
m_path( move(o.m_path) ),
m_node( move(o.m_node) ),
m_sub_patterns( move(o.m_sub_patterns) )
{ }
Pattern(const Pattern& o):
m_class(o.m_class),
m_binding(o.m_binding),
m_path(o.m_path),
m_node(nullptr),
m_sub_patterns(o.m_sub_patterns)
{
if( o.m_node.get() ) {
DEBUG("Cloning " << o);
throw ::std::runtime_error(FMT("Cloning pattern with node : " << o));
}
}
Pattern& operator=(Pattern o)
{
m_class = o.m_class,
m_binding = move(o.m_binding);
m_path = move(o.m_path);
m_node = move(o.m_node);
m_sub_patterns = move(o.m_sub_patterns);
return *this;
}
Pattern():
m_class(ANY)
{}
// Wildcard = '..', distinct from '_'
// TODO: Store wildcard as a different pattern type
struct TagWildcard {};
Pattern(TagWildcard):
m_class(ANY)
{}
struct TagBind {};
Pattern(TagBind, ::std::string name):
m_class(ANY),
m_binding(name)
{}
struct TagMaybeBind {};
Pattern(TagMaybeBind, ::std::string name):
m_class(MAYBE_BIND),
m_binding(name)
{}
struct TagValue {};
Pattern(TagValue, unique_ptr<ExprNode> node, unique_ptr<ExprNode> node2 = 0):
m_class(VALUE),
m_node( ::std::move(node) ),
m_node2( ::std::move(node2) )
{}
struct TagReference {};
Pattern(TagReference, Pattern sub_pattern):
m_class(REF),
m_sub_patterns()
{
m_sub_patterns.push_back( ::std::move(sub_pattern) );
}
struct TagTuple {};
Pattern(TagTuple, ::std::vector<Pattern> sub_patterns):
m_class(TUPLE),
m_sub_patterns( ::std::move(sub_patterns) )
{}
struct TagEnumVariant {};
Pattern(TagEnumVariant, Path path, ::std::vector<Pattern> sub_patterns):
m_class(TUPLE_STRUCT),
m_path( ::std::move(path) ),
m_sub_patterns( ::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_class == VALUE); m_class = ANY; return ::std::move(m_node); }
// Accessors
const ::std::string& binding() const { return m_binding; }
BindType type() const { return m_class; }
ExprNode& node() { return *m_node; }
const ExprNode& node() const { return *m_node; }
Path& path() { return m_path; }
const Path& path() const { return m_path; }
::std::vector<Pattern>& sub_patterns() { return m_sub_patterns; }
const ::std::vector<Pattern>& sub_patterns() const { return m_sub_patterns; }
friend ::std::ostream& operator<<(::std::ostream& os, const Pattern& pat);
SERIALISABLE_PROTOTYPES();
};
};
#endif
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