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/*
*/
#ifndef AST_PATH_HPP_INCLUDED
#define AST_PATH_HPP_INCLUDED
#include "../common.hpp"
#include <string>
#include <stdexcept>
#include <vector>
#include <initializer_list>
#include <cassert>
#include <serialise.hpp>
class TypeRef;
namespace AST {
class Crate;
class Module;
class TypeAlias;
class Enum;
class Struct;
class Trait;
class Static;
class Function;
class PathNode:
public ::Serialisable
{
::std::string m_name;
::std::vector<TypeRef> m_params;
public:
PathNode() {}
PathNode(::std::string name, ::std::vector<TypeRef> args = {});
const ::std::string& name() const;
::std::vector<TypeRef>& args() { return m_params; }
const ::std::vector<TypeRef>& args() const;
bool operator==(const PathNode& x) const;
void print_pretty(::std::ostream& os) const;
friend ::std::ostream& operator<<(::std::ostream& os, const PathNode& pn);
SERIALISABLE_PROTOTYPES();
};
class Path:
public ::Serialisable
{
public:
enum BindingType {
UNBOUND,
MODULE,
ALIAS,
ENUM,
STRUCT,
TRAIT,
STRUCT_METHOD,
ENUM_VAR,
FUNCTION,
STATIC,
};
private:
enum Class {
RELATIVE,
ABSOLUTE,
LOCAL,
};
/// The crate defining the root of this path (used for path resolution)
::std::string m_crate;
/// Path class (absolute, relative, local)
/// - Absolute is "relative" to the crate root
/// - Relative doesn't have a set crate (and can't be resolved)
/// - Local is a special case to handle possible use of local varaibles
Class m_class;
::std::vector<PathNode> m_nodes;
BindingType m_binding_type = UNBOUND;
union {
const Module* module_;
const Enum* enum_;
const Struct* struct_;
const Trait* trait_;
const Static* static_;
const Function* func_;
struct {
const Enum* enum_;
unsigned int idx;
} enumvar;
const TypeAlias* alias_;
} m_binding;
public:
Path():
m_class(RELATIVE)
{}
struct TagAbsolute {};
Path(TagAbsolute):
m_class(ABSOLUTE)
{}
struct TagLocal {};
Path(TagLocal, ::std::string name):
m_class(LOCAL),
m_nodes({PathNode(name, {})})
{}
Path(::std::initializer_list<PathNode> l):
m_class(ABSOLUTE),
m_nodes(l)
{}
Path(::std::string crate, ::std::vector<PathNode> nodes):
m_crate( ::std::move(crate) ),
m_class(ABSOLUTE),
m_nodes( ::std::move(nodes) )
{}
void set_crate(::std::string crate) {
if( m_crate == "" ) {
m_crate = crate;
DEBUG("crate set to " << m_crate);
}
}
static Path add_tailing(const Path& a, const Path& b) {
Path ret(a);
ret[ret.size()-1].args() = b[0].args();
for(unsigned int i = 1; i < b.m_nodes.size(); i ++)
ret.m_nodes.push_back(b.m_nodes[i]);
return ret;
}
Path operator+(PathNode&& pn) const {
Path tmp;
tmp.append( ::std::move(pn) );
return Path(*this) += tmp;
}
Path operator+(const ::std::string& s) const {
Path tmp;
tmp.append(PathNode(s, {}));
return Path(*this) += tmp;
}
Path operator+(const Path& x) const {
return Path(*this) += x;
}
Path& operator+=(const Path& x);
void append(PathNode node) {
m_nodes.push_back(node);
}
void resolve(const Crate& crate);
bool is_absolute() const { return m_class == ABSOLUTE; }
bool is_relative() const { return m_class == RELATIVE; }
size_t size() const { return m_nodes.size(); }
bool is_bound() const { return m_binding_type != UNBOUND; }
BindingType binding_type() const { return m_binding_type; }
#define _(t, n, v) const t& bound_##n() const { assert(m_binding_type == v); return *m_binding.n##_; }
_(Module, module, MODULE)
_(Trait, trait, TRAIT)
_(Struct, struct, STRUCT)
//_(Enum, enum, ENUM)
_(Function, func, FUNCTION)
_(Static, static, STATIC)
_(TypeAlias, alias, ALIAS)
#undef _
const Enum& bound_enum() const {
assert(m_binding_type == ENUM || m_binding_type == ENUM_VAR); // Kinda evil, given that it has its own union entry
return *m_binding.enum_;
}
const unsigned int bound_idx() const {
assert(m_binding_type == ENUM_VAR);
return m_binding.enumvar.idx;
}
::std::vector<PathNode>& nodes() { return m_nodes; }
const ::std::vector<PathNode>& nodes() const { return m_nodes; }
PathNode& operator[](int idx) { if(idx>=0) return m_nodes[idx]; else return m_nodes[size()+idx]; }
const PathNode& operator[](int idx) const { if(idx>=0) return m_nodes[idx]; else return m_nodes[size()+idx]; }
bool operator==(const Path& x) const;
SERIALISABLE_PROTOTYPES();
void print_pretty(::std::ostream& os) const;
friend ::std::ostream& operator<<(::std::ostream& os, const Path& path);
friend ::Serialiser& operator<<(Serialiser& s, Path::Class pc);
friend void operator>>(Deserialiser& s, Path::Class& pc);
private:
void bind_module(const Module& mod);
void bind_enum(const Enum& ent, const ::std::vector<TypeRef>& args);
void bind_enum_var(const Enum& ent, const ::std::string& name, const ::std::vector<TypeRef>& args);
void bind_struct(const Struct& ent, const ::std::vector<TypeRef>& args);
void bind_static(const Static& ent);
};
} // namespace AST
#endif
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