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#pragma once
#include "repr.h"
#include "typeInfo.h"
#include <functional>
#include <optional>
template<typename T>
using opt = std::optional<T>;
template<typename ... Ts>
using tup = std::tuple<Ts ...>;
// find an item in a vector by predicate
template<typename T>
opt<T> find(const std::vector<T> & ts, std::function<bool(T)> f)
{
for (auto t : ts)
if (f(t))
return t;
return nullopt;
}
// same as above but return pointer into raw array held by vector
template<typename T>
opt<T *> findPtr(const std::vector<T> & ts, std::function<bool(T)> f)
{
for (int i = 0; i < ts.size(); i++)
if (f(ts[i]))
return &((T *)ts.data())[i];
return nullopt;
}
opt<tup<
std::shared_ptr<Context>,
std::vector<std::string>>>
getContext(std::shared_ptr<Context> ctx, const std::vector<std::string> & namespacePrefix)
{
// try finding a continuos series of namespaces in a given context
auto result = ctx;
for (auto name : namespacePrefix)
{
auto newResult = find<Namespace>(result->namespaces, [&](Namespace n) { return n.name == name; });
if (newResult.has_value())
{
result = newResult->ctx;
}
else
{
return nullopt;
}
}
// if the found context is the end of a series of namespaces, also return
// a vector of namespace names
std::vector<std::string> namespaces;
for (auto it = result; it != nullptr; it = it->parent)
{
if (it->name.has_value())
{
namespaces.insert(namespaces.begin(), it->name.value());
}
else if (it->parent != nullptr)
{
namespaces.clear();
break;
}
}
return std::make_tuple(result, namespaces);
}
// all of the following functions work the same way,
// walking up the context hierarchy until the global context.
// return the first found instance that matches provided criteria
// theres also a variant to get a pointer instead for functions and
// structs used for generic instantiation
opt<tup<Function, std::vector<std::string>>> findFunction(
const std::string & name,
const std::vector<std::string> & namespacePrefix,
std::shared_ptr<Context> ctx)
{
for (auto it = ctx; it != nullptr; it = it->parent)
{
auto n = getContext(it, namespacePrefix);
if (n.has_value())
{
auto x = find<Function>(std::get<0>(*n)->functions, [&](Function _) { return _.name == name; });
if (x.has_value())
return std::make_tuple(x.value(), std::get<1>(*n));
}
}
return nullopt;
}
opt<tup<Function *, std::vector<std::string>>> findFunctionPtr(
const std::string & name,
const std::vector<std::string> & namespacePrefix,
std::shared_ptr<Context> ctx)
{
for (auto it = ctx; it != nullptr; it = it->parent)
{
auto n = getContext(it, namespacePrefix);
if (n.has_value())
{
auto x = findPtr<Function>(std::get<0>(*n)->functions, [&](Function _) { return _.name == name; });
if (x.has_value())
return std::make_tuple(x.value(), std::get<1>(*n));
}
}
return nullopt;
}
opt<tup<Struct, std::vector<std::string>>> findStruct(
const std::string & name,
const std::vector<std::string> & namespacePrefix,
std::shared_ptr<Context> ctx)
{
for (auto it = ctx; it != nullptr; it = it->parent)
{
auto n = getContext(it, namespacePrefix);
if (n.has_value())
{
auto x = find<Struct>(std::get<0>(*n)->structs, [&](Struct _) { return _.name == name; });
if (x.has_value())
return std::make_tuple(x.value(), std::get<1>(*n));
}
}
return nullopt;
}
opt<tup<Struct *, std::vector<std::string>>> findStructPtr(
const std::string & name,
const std::vector<std::string> & namespacePrefix,
std::shared_ptr<Context> ctx)
{
for (auto it = ctx; it != nullptr; it = it->parent)
{
auto n = getContext(it, namespacePrefix);
if (n.has_value())
{
auto x = findPtr<Struct>(std::get<0>(*n)->structs, [&](Struct _) { return _.name == name; });
if (x.has_value())
return std::make_tuple(x.value(), std::get<1>(*n));
}
}
return nullopt;
}
opt<tup<Variable, std::vector<std::string>>> findVariable(
const std::string & name,
const std::vector<std::string> & namespacePrefix,
std::shared_ptr<Context> ctx)
{
for (auto it = ctx; it != nullptr; it = it->parent)
{
auto n = getContext(it, namespacePrefix);
if (n.has_value())
{
auto x = find<Variable>(std::get<0>(*n)->variables, [&](Variable _) { return _.name == name; });
if (x.has_value())
return std::make_tuple(x.value(), std::get<1>(*n));
}
}
return nullopt;
}
// find struct members and pointer variants
opt<StructMember<Function>> findStructMethod(
const std::string & name,
const Struct & s)
{
return find<StructMember<Function>>(s.methods, [&](Function f) { return f.name == name; });
}
opt<StructMember<Function> *> findStructMethodPtr(
const std::string & name,
const Struct & s)
{
return findPtr<StructMember<Function>>(s.methods, [&](Function f) { return f.name == name; });
}
opt<StructMember<Variable>> findStructMember(
const std::string & name,
const Struct & s)
{
return find<StructMember<Variable>>(s.members, [&](Variable v) { return v.name == name; });
}
opt<StructMember<Variable> *> findStructMemberPtr(
const std::string & name,
const Struct & s)
{
return findPtr<StructMember<Variable>>(s.members, [&](Variable v) { return v.name == name; });
}
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