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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: Lexer for assembly language
*/
#include <lib/inst.h>
#include <algorithm>
#include <tuple>
#include "./lexer.hpp"
using std::string, std::string_view, std::pair, std::make_pair;
constexpr auto VALID_SYMBOL = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUV"
"WXYZ0123456789-_.:()%#$",
VALID_DIGIT = "0123456789";
bool is_char_in_s(char c, const char *s)
{
return string_view(s).find(c) != string::npos;
}
bool initial_match(string_view src, string_view match)
{
return (src.size() > match.size() && src.substr(0, match.size()) == match);
}
pair<token_t, lerr_t> tokenise_symbol(string_view &source, size_t &column)
{
auto end = source.find_first_not_of(VALID_SYMBOL);
if (end == string::npos)
end = source.size() - 1;
string sym{source.substr(0, end)};
source.remove_prefix(end);
std::transform(sym.begin(), sym.end(), sym.begin(), ::toupper);
token_t t{};
if (initial_match(sym, "%CONST"))
{
t = token_t(token_type_t::PP_CONST, sym.substr(6));
}
else if (sym == "%USE")
{
t.type = token_type_t::PP_USE;
}
else if (sym == "%END")
{
t.type = token_type_t::PP_END;
}
else if (sym[0] == '%')
{
return make_pair(t, lerr_t::INVALID_PREPROCESSOR_DIRECTIVE);
}
else if (sym.size() > 1 && sym[0] == '$')
{
t = token_t(token_type_t::PP_REFERENCE, sym.substr(1));
}
else if (sym == "NOOP")
{
t.type = token_type_t::NOOP;
}
else if (sym == "HALT")
{
t.type = token_type_t::HALT;
}
else if (initial_match(sym, "PUSH.REG."))
{
t = token_t(token_type_t::PUSH_REG, sym.substr(9));
}
else if (initial_match(sym, "PUSH."))
{
t = token_t(token_type_t::PUSH, sym.substr(5));
}
else if (initial_match(sym, "POP."))
{
t = token_t(token_type_t::POP, sym.substr(4));
}
else if (initial_match(sym, "MOV."))
{
t = token_t(token_type_t::MOV, sym.substr(4));
}
else if (initial_match(sym, "DUP."))
{
t = token_t(token_type_t::DUP, sym.substr(4));
}
else if (initial_match(sym, "MALLOC.STACK."))
{
t = token_t(token_type_t::MALLOC_STACK, sym.substr(13));
}
else if (initial_match(sym, "MALLOC."))
{
t = token_t(token_type_t::MALLOC, sym.substr(7));
}
else if (initial_match(sym, "MSET.STACK."))
{
t = token_t(token_type_t::MSET_STACK, sym.substr(11));
}
else if (initial_match(sym, "MSET."))
{
t = token_t(token_type_t::MSET, sym.substr(5));
}
else if (initial_match(sym, "MGET.STACK."))
{
t = token_t(token_type_t::MGET_STACK, sym.substr(11));
}
else if (initial_match(sym, "MGET."))
{
t = token_t(token_type_t::MGET, sym.substr(5));
}
else if (sym == "MDELETE")
{
t.type = token_type_t::MDELETE;
}
else if (sym == "MSIZE")
{
t.type = token_type_t::MSIZE;
}
else if (initial_match(sym, "NOT."))
{
t = token_t(token_type_t::NOT, sym.substr(4));
}
else if (initial_match(sym, "OR."))
{
t = token_t(token_type_t::OR, sym.substr(3));
}
else if (initial_match(sym, "AND."))
{
t = token_t(token_type_t::AND, sym.substr(4));
}
else if (initial_match(sym, "XOR."))
{
t = token_t(token_type_t::XOR, sym.substr(4));
}
else if (initial_match(sym, "EQ."))
{
t = token_t(token_type_t::EQ, sym.substr(3));
}
else if (initial_match(sym, "LTE."))
{
t = token_t(token_type_t::LTE, sym.substr(4));
}
else if (initial_match(sym, "LT."))
{
t = token_t(token_type_t::LT, sym.substr(3));
}
else if (initial_match(sym, "GTE."))
{
t = token_t(token_type_t::GTE, sym.substr(4));
}
else if (initial_match(sym, "GT."))
{
t = token_t(token_type_t::GT, sym.substr(3));
}
else if (initial_match(sym, "SUB."))
{
t = token_t(token_type_t::SUB, sym.substr(4));
}
else if (initial_match(sym, "PLUS."))
{
t = token_t(token_type_t::PLUS, sym.substr(5));
}
else if (initial_match(sym, "MULT."))
{
t = token_t(token_type_t::MULT, sym.substr(5));
}
else if (initial_match(sym, "PRINT."))
{
t = token_t(token_type_t::PRINT, sym.substr(6));
}
else if (sym == "JUMP.ABS")
{
t.type = token_type_t::JUMP_ABS;
}
else if (sym == "JUMP.STACK")
{
t.type = token_type_t::JUMP_STACK;
}
else if (initial_match(sym, "JUMP.IF."))
{
t = token_t(token_type_t::JUMP_IF, sym.substr(8));
}
else if (sym == "CALL.STACK")
{
t.type = token_type_t::CALL_STACK;
}
else if (sym == "CALL")
{
t.type = token_type_t::CALL;
}
else if (sym == "RET")
{
t.type = token_type_t::RET;
}
else if (sym == "GLOBAL")
{
t.type = token_type_t::GLOBAL;
}
else
{
t.type = token_type_t::SYMBOL;
}
if (t.content == "")
t.content = sym;
t.column = column;
column += sym.size();
return make_pair(t, lerr_t::OK);
}
token_t tokenise_literal_number(string_view &source, size_t &column)
{
bool is_negative = false;
if (source[0] == '-')
{
is_negative = true;
source.remove_prefix(1);
}
auto end = source.find_first_not_of(VALID_DIGIT);
if (end == string::npos)
end = source.size() - 1;
string digits{source.substr(0, end)};
source.remove_prefix(end);
token_t t{token_type_t::LITERAL_NUMBER, (is_negative ? "-" : "") + digits,
column};
column += digits.size() + (is_negative ? 1 : 0);
return t;
}
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