examples/7guis/cells/src/Formula.cpp

Note

This Source File belongs to 7GUIs Cells Example. Please follow the link for example explanation.

//
// Created by alex2772 on 3/7/25.
//
 
#include "Formula.h"
#include "AUI/Common/AVector.h"
#include "AUI/Util/ATokenizer.h"
#include "Tokens.h"
#include "AUI/Logging/ALogger.h"
#include "AST.h"
#include "AUI/Util/AEvaluationLoopException.h"
 
formula::Value formula::evaluate(const Spreadsheet& spreadsheet, const AString& expression) {
   return precompile(expression)(spreadsheet);
}
 
formula::Precompiled formula::precompile(const AString& expression) {
   if (expression.empty()) {
       return [](const Spreadsheet&) { return std::nullopt; };
   }
   if (auto d = expression.toDouble()) {
       return [d = *d](const Spreadsheet&) { return d; };
   }
   if (!expression.startsWith('=')) {
       return [stringConstant = expression](const Spreadsheet&) { return stringConstant; };
   }
   try {
       auto tokens = token::parse(ATokenizer(expression));
       auto p = ast::parseExpression(tokens);
 
       return [p = std::shared_ptr(std::move(p))](const Spreadsheet& ctx) -> formula::Value {
           try {
               return p->evaluate(ctx);
           } catch (const AEvaluationLoopException& e) {
               return "#LOOP!";
           } catch (const AException& e) {
               return "#{}!"_format(e.getMessage());
           }
       };
   } catch (const AException& e) {
       ALogger::err("Formula") << "Can't parse expression " << expression << "\n" << e;
       return [msg = e.getMessage()](const Spreadsheet&) { return "#{}!"_format(msg); };
   }
}

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