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/*
** Copyright (C) 2017 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public License
** as published by the Free Software Foundation; either version 2.1
** of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free
** Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*/
#include "tokenizer.hh"
#include "utils.hh"
#include <cctype>
#include <iostream>
#include <algorithm>
using namespace Mux;
static bool
is_separator (char c)
{
if (isblank(c))
return true;
const auto seps = std::string ("()");
return seps.find(c) != std::string::npos;
}
static Mux::Token
op_or_value (size_t pos, const std::string& val)
{
auto s = val;
std::transform(s.begin(), s.end(), s.begin(), ::tolower);
if (s == "and")
return Token{pos, Token::Type::And, val};
else if (s == "or")
return Token{pos, Token::Type::Or, val};
else if (s == "xor")
return Token{pos, Token::Type::Xor, val};
else if (s == "not")
return Token{pos, Token::Type::Not, val};
else
return Token{pos, Token::Type::Data, val};
}
static void
unread_char (std::string& food, char kar, size_t& pos)
{
food = kar + food;
--pos;
}
static Mux::Token
eat_token (std::string& food, size_t& pos)
{
bool quoted{};
bool escaped{};
std::string value {};
while (!food.empty()) {
const auto kar = food[0];
food.erase(0, 1);
++pos;
if (kar == '\\') {
escaped = !escaped;
if (escaped)
continue;
}
if (kar == '"') {
if (!escaped && quoted)
return Token{pos, Token::Type::Data, value};
else {
quoted = true;
continue;
}
}
if (!quoted && !escaped && is_separator(kar)) {
if (!value.empty() && kar != ':') {
unread_char (food, kar, pos);
return op_or_value(pos, value);
}
if (quoted || isblank(kar))
continue;
switch (kar) {
case '(': return {pos, Token::Type::Open, "("};
case ')': return {pos, Token::Type::Close,")"};
default: break;
}
}
value += kar;
escaped = false;
}
return {pos, Token::Type::Data, value};
}
Mux::Tokens
Mux::tokenize (const std::string& s)
{
Tokens tokens{};
std::string food = utf8_clean(s);
size_t pos{0};
if (s.empty())
return {};
while (!food.empty())
tokens.emplace_back(eat_token (food, pos));
return tokens;
}
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