A dart package to help you parse and evaluate infix mathematical expressions into their prefix and postfix notations.

import 'package:infix_expression_parser/infix_expression_converter.dart';

void main() {
  // Provide an infix expression
  const infixExpression = '(a-b+c)*(d+e*f)';

  // Create an instance of InfixExpressionConverter
  final converter = InfixExpressionConverter(expression: infixExpression);

  final postfixExpression = converter.toPostfixNotation();
  final prefixExpression = converter.toPrefixNotation();

  print(postfixExpression); // ab-c+def*+*
  print(prefixExpression); // *+-abc+d*ef
}

import 'package:infix_expression_parser/expression_evaluator.dart';

void main() {
  // Define a context map
  const context = {'a': 2, 'b': 3, 'c': 4, 'd': 5};

  // Provide a postfix expression
  const postfixExpression = 'abc+*d/';

  // Use the static method provided by the ExpressionEvaluator class and pass both the expression and the context
  final value = ExpressionEvaluator.evaluatePostfix(expression: postfixExpression, context: context);

  print(value); // 2.8
}

import 'package:infix_expression_parser/expression_evaluator.dart';

void main() {
  // Define a context map
  const context = {'a': 2, 'b': 3, 'c': 4, 'd': 5, 'e': 6};

  // Provide a postfix expression
  const prefixExpression = '*-a/bc-/ade';

  // Use the static method provided by the ExpressionEvaluator class and pass both the expression and the context
  final value = ExpressionEvaluator.evaluatePrefix(expression: prefixExpression, context: context);

  print(value); // -7.0
}

import 'package:infix_expression_parser/infix_expression_converter.dart';
import 'package:infix_expression_parser/expression_evaluator.dart';

void main() {
  // Provide an infix expression
  const infixExpression = 'a-b+c-d*e';

  // Convert it to either its postfix or prefix notation
  final converter = InfixExpressionConverter(expression: infixExpression);
  final postfixExpression = converter.toPostfixNotation();

  // Define a context map
  const context = {'a': 2, 'b': 3, 'c': 4, 'd': 5, 'e': 6};

  // Use the static method provided by the ExpressionEvaluator class and pass both the expression and the context
  final value = ExpressionEvaluator.evaluatePostfix(expression: postfixExpression, context: context);

  print(value); // -27.0
}