Type Members

1.  abstract class AbstractEvaluator [R] extends Evaluator[R]

   A skeletal implementation of the Evaluator class to avoid duplication of common logic.

   A skeletal implementation of the Evaluator class to avoid duplication of common logic.

   This class is applicable if, and only if, for each character it is unambiguous whether it is part of a word or special character. That is, every character can be either a special character, or part of a word, but not both. Furthermore, neither special characters not words can contain whitespace.

   A 'special character' here is a standalone character that has a special meaning. Special characters cannot be part of values or words. For example, + would be a special character.

   A 'word' here is a meaningful string of characters that do not contain any whitespace or special characters. For example, the constant pi is a word, as are functions such as sin. Words cannot contain special characters or they could be mistaken for two words - the word a+b would be split into a, +, and b.

   R

   What the string should be evaluated to

2.  sealed trait Associativity extends AnyRef

   This represents the associativity of an operator.

   This represents the associativity of an operator.

   Operators can be either left associative or right associative. This indicated the order in which operators of the same precedence are evaluated in the absence of parentheses - from left to right or from right to left.

   For example, the / operator is left associative, so

   2 / 2 / 2 = (2 / 2) / 2

   However, the ^ operator is right associative, so

   2 ^ 2 ^ 2 = 2 ^ (2 ^ 2)

3.  case class EvaluationException (message: String = "Syntax error", cause: Throwable = null) extends Exception with Product with Serializable

   This is thrown by an Evaluator when it is parsing an expression with a syntax error.

   This is thrown by an Evaluator when it is parsing an expression with a syntax error.

   message

   The detailed message

   cause

   The cause

4.  abstract class Evaluator [R] extends AnyRef

   An Evaluator is a string parser and evaluator.

   An Evaluator is a string parser and evaluator.

   This class is flexible, allowing a user to define their own syntax. An example use might be to parse maths expressions, such as (1 + 2) ^ 3.

   R

   What the string should be evaluated to

   See also

   ComplexEvaluator

5.  sealed trait Token [R] extends AnyRef

   Represents one of the base parts of an expression parsed by an Evaluator.

   Represents one of the base parts of an expression parsed by an Evaluator.

   R

   The type that the evaluator should return after evaluating the tokens