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#include "Expression.hpp"
#include "muParser.h"
#include "../../debug/log/Logger.hpp"
#include <cctype>
#include <format>
using namespace Math;
static std::string_view trimExprView(std::string_view s) {
while (!s.empty() && std::isspace(static_cast<unsigned char>(s.front())))
s.remove_prefix(1);
while (!s.empty() && std::isspace(static_cast<unsigned char>(s.back())))
s.remove_suffix(1);
return s;
}
bool SExpressionVec2::empty() const {
return x.empty() || y.empty();
}
std::string SExpressionVec2::toString() const {
if (empty())
return "";
return std::format("{} {}", x, y);
}
std::expected<SExpressionVec2, std::string> Math::parseExpressionVec2(std::string_view raw) {
raw = trimExprView(raw);
if (raw.empty())
return SExpressionVec2{};
const auto spacePos = raw.find_first_of(" \t\n\r\f\v");
if (spacePos == std::string_view::npos)
return std::unexpected("expression vec2 requires two expressions separated by whitespace");
auto lhs = trimExprView(raw.substr(0, spacePos));
auto rhs = trimExprView(raw.substr(spacePos + 1));
if (lhs.empty() || rhs.empty())
return std::unexpected("expression vec2 requires two non-empty expressions");
return SExpressionVec2{std::string{lhs}, std::string{rhs}};
}
CExpression::CExpression() : m_parser(makeUnique<mu::Parser>()) {
;
}
void CExpression::addVariable(const std::string& name, double val) {
m_parser->DefineConst(name, val);
}
std::optional<double> CExpression::compute(const std::string& expr) {
try {
m_parser->SetExpr(expr);
return m_parser->Eval();
} catch (mu::Parser::exception_type& e) { Log::logger->log(Log::ERR, "CExpression::compute: mu threw: {}", e.GetMsg()); }
return std::nullopt;
}
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