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Implement comparison operators

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This commit is contained in:
Eugen Wissner
2024-04-02 09:07:13 +02:00
parent 33a951687b
commit 0cad759415
9 changed files with 205 additions and 42 deletions
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92
source/lexer.cpp
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@ -204,7 +204,8 @@ namespace elna::source
{
return of() == type::identifier
|| of() == type::term_operator
|| of() == type::factor_operator;
|| of() == type::factor_operator
|| of() == type::comparison_operator;
}
bool token::is_numeric() const noexcept
@ -218,51 +219,53 @@ namespace elna::source
switch (this->m_type)
{
case type::number:
return "«number»";
return "«number»";
case type::boolean:
return "«boolean»";
return "«boolean»";
case type::term_operator:
return "«term_operator»";
return "«term_operator»";
case type::let:
return "«const»";
return "«const»";
case type::identifier:
return "«identifier»";
return "«identifier»";
case type::equals:
return "«=»";
return "«=»";
case type::var:
return "«var»";
return "«var»";
case type::semicolon:
return "«;»";
return "«;»";
case type::left_paren:
return "«(»";
return "«(»";
case type::right_paren:
return "«)»";
return "«)»";
case type::dot:
return "«)»";
return "«)»";
case type::comma:
return "«,»";
return "«,»";
case type::factor_operator:
return "«*»";
return "«*»";
case type::eof:
return "«EOF»";
return "«EOF»";
case type::begin:
return "«begin»";
return "«begin»";
case type::end:
return "«end»";
return "«end»";
case type::assignment:
return "«:=»";
return "«:=»";
case type::colon:
return "«:»";
return "«:»";
case type::when:
return "«if»";
return "«if»";
case type::then:
return "«then»";
case type::_while:
return "«while»";
return "«then»";
case type::loop:
return "«while»";
case type::_do:
return "«do»";
return "«do»";
case type::procedure:
return "«proc»";
return "«proc»";
case type::comparison_operator:
return "«comparison_operator»";
};
assert(false);
}
@ -446,7 +449,7 @@ namespace elna::source
}
else if (word == "while")
{
tokens.emplace_back(token::type::_while, iterator.position());
tokens.emplace_back(token::type::loop, iterator.position());
}
else if (word == "do")
{
@ -477,12 +480,49 @@ namespace elna::source
tokens.emplace_back(token::type::term_operator, _operator.c_str(), iterator.position());
}
else if (*iterator == '/' && iterator + 1 != text_end && *(iterator + 1) == '=')
{
tokens.emplace_back(token::type::comparison_operator, "n", iterator.position());
++iterator;
}
else if (*iterator == '*' || *iterator == '/')
{
std::string _operator{ *iterator };
tokens.emplace_back(token::type::factor_operator, _operator.c_str(), iterator.position());
}
else if (*iterator == '<')
{
std::string _operator;
auto operator_position = iterator.position();
if (iterator + 1 == text_end || *(iterator + 1) != '=')
{
_operator.push_back(*iterator);
}
else
{
++iterator;
_operator.push_back('l');
}
tokens.emplace_back(token::type::comparison_operator, _operator.c_str(), operator_position);
}
else if (*iterator == '>')
{
std::string _operator;
auto operator_position = iterator.position();
if (iterator + 1 == text_end || *(iterator + 1) != '=')
{
_operator.push_back(*iterator);
}
else
{
++iterator;
_operator.push_back('g');
}
tokens.emplace_back(token::type::comparison_operator, _operator.c_str(), operator_position);
}
else if (*iterator == ':' && iterator + 1 != text_end && *(iterator + 1) == '=')
{
tokens.emplace_back(token::type::assignment, iterator.position());