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/* Copyright (C) 2024 Aryadev Chavali
* You may distribute and modify this code under the terms of the
* GPLv2 license. You should have received a copy of the GPLv2
* license with this file. If not, please write to:
* aryadev@aryadevchavali.com.
* Created: 2024-04-14
* Author: Aryadev Chavali
* Description: Preprocessor which occurs after lexing before parsing.
*/
#include "./preprocesser.hpp"
#include "./base.hpp"
#include <algorithm>
#include <unordered_map>
using std::pair, std::vector, std::make_pair, std::string, std::string_view;
#define ERR(E) std::make_pair(tokens, (E))
#define VAL(E) std::make_pair(E, pp_err_t{pp_err_type_t::OK})
pair<vector<token_t *>, pp_err_t>
preprocess_use_blocks(vector<token_t *> tokens)
{
vector<token_t *> new_tokens;
for (size_t i = 0; i < tokens.size(); ++i)
{
token_t *t = tokens[i];
if (t->type == token_type_t::PP_USE)
{
if (i + 1 >= tokens.size() ||
tokens[i + 1]->type != token_type_t::LITERAL_STRING)
{
new_tokens.clear();
return ERR(pp_err_t(pp_err_type_t::EXPECTED_STRING, t));
}
token_t *name = tokens[i + 1];
auto source = read_file(name->content.c_str());
if (!source)
{
new_tokens.clear();
return ERR(pp_err_t(pp_err_type_t::FILE_NONEXISTENT, name));
}
std::vector<token_t *> ftokens;
lerr_t lerr = tokenise_buffer(source.value(), ftokens);
if (lerr != lerr_t::OK)
{
new_tokens.clear();
return ERR(pp_err_t(pp_err_type_t::FILE_PARSE_ERROR, name, lerr));
}
new_tokens.insert(new_tokens.end(), ftokens.begin(), ftokens.end());
i += 2;
}
else
new_tokens.push_back(new token_t{*t});
}
return VAL(new_tokens);
}
std::ostream &operator<<(std::ostream &os, pp_err_t &err)
{
os << "PREPROCESSING_";
switch (err.type)
{
case OK:
return os << "OK";
case EXPECTED_NAME:
return os << "EXPECTED_NAME";
case EXPECTED_STRING:
return os << "EXPECTED_STRING";
case EXPECTED_END:
return os << "EXPECTED_END";
case FILE_NONEXISTENT:
return os << "FILE_NONEXISTENT";
case FILE_PARSE_ERROR:
return os << "FILE_PARSE_ERROR -> \n\t[" << err.reference->content
<< "]: " << lerr_as_cstr(err.lerr);
case UNKNOWN_NAME:
return os << "UNKNOWN_NAME";
}
return os;
}
pp_err_t::pp_err_t(pp_err_type_t e)
: reference{nullptr}, type{e}, lerr{lerr_t::OK}
{}
pp_err_t::pp_err_t(pp_err_type_t err, const token_t *ref)
: reference{ref}, type{err}
{}
pp_err_t::pp_err_t(pp_err_type_t err, const token_t *ref, lerr_t lerr)
: reference{ref}, type{err}, lerr{lerr}
{}
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