belka/elna
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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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64
source/parser.cpp
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@ -262,6 +262,24 @@ namespace elna::source
case '/':
this->m_operator = binary_operator::division;
break;
case '=':
this->m_operator = binary_operator::equals;
break;
case 'n':
this->m_operator = binary_operator::not_equals;
break;
case '<':
this->m_operator = binary_operator::less;
break;
case 'l':
this->m_operator = binary_operator::less_equal;
break;
case '>':
this->m_operator = binary_operator::greater;
break;
case 'g':
this->m_operator = binary_operator::greater_equal;
break;
default:
throw std::logic_error("Invalid binary operator");
}
@ -442,7 +460,7 @@ namespace elna::source
{
++iterator;
auto expression = parse_expression();
auto expression = parse_condition();
++iterator;
@ -489,6 +507,38 @@ namespace elna::source
return term;
}
std::unique_ptr<expression> parser::parse_condition()
{
std::unique_ptr<expression> lhs;
if ((lhs = parse_expression()) == nullptr)
{
return lhs;
}
unsigned char _operator{ 0 };
if (iterator.current().of() == source::token::type::equals)
{
_operator = '=';
}
else if (iterator.current().of() == source::token::type::comparison_operator)
{
_operator = iterator->identifier()[0];
}
else
{
return lhs;
}
++iterator;
auto rhs = parse_expression();
if (rhs == nullptr)
{
return nullptr;
}
return std::make_unique<binary_expression>(std::move(lhs), std::move(rhs), _operator);
}
std::unique_ptr<constant_definition> parser::parse_constant_definition()
{
auto definition_identifier = iterator.advance(token::type::identifier);
@ -595,7 +645,7 @@ namespace elna::source
{
return parse_if_statement();
}
else if (iterator.current(token::type::_while))
else if (iterator.current(token::type::loop))
{
return parse_while_statement();
}
@ -618,7 +668,7 @@ namespace elna::source
++iterator;
return call;
}
while ((argument_expression = parse_expression()) != nullptr)
while ((argument_expression = parse_condition()) != nullptr)
{
call->arguments().push_back(std::move(argument_expression));
@ -674,7 +724,7 @@ namespace elna::source
{
return nullptr;
}
auto rvalue = parse_expression();
auto rvalue = parse_condition();
if (rvalue == nullptr)
{
@ -689,7 +739,7 @@ namespace elna::source
{
return nullptr;
}
auto condition = parse_expression();
auto condition = parse_condition();
if (condition == nullptr || !iterator.skip(token::type::then))
{
@ -706,11 +756,11 @@ namespace elna::source
std::unique_ptr<while_statement> parser::parse_while_statement()
{
if (!iterator.skip(token::type::_while))
if (!iterator.skip(token::type::loop))
{
return nullptr;
}
auto condition = parse_expression();
auto condition = parse_condition();
if (condition == nullptr || !iterator.skip(token::type::_do))
{