Class: Mutant::Expression::Parser

Inherits:

Object

• Object
• Mutant::Expression::Parser

Defined in:

lib/mutant/expression/parser.rb

Defined Under Namespace

Classes: AmbiguousExpressionError, InvalidExpressionError, ParserError

Instance Method Summary

• #call(input) ⇒ Expression private

  Parse input into expression or raise.

• #try_parse(input) ⇒ Expression^? private

  Try to parse input into expression.

Instance Method Details

#call(input) ⇒ Expression

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parse input into expression or raise

Parameters:

• syntax (String)

Returns:

• (Expression) —

  if expression is valid

Raises:

• (ParserError) —

  otherwise

# File 'lib/mutant/expression/parser.rb', line 27

def call(input)
  try_parse(input) or fail InvalidExpressionError, "Expression: #{input.inspect} is not valid"
end

#try_parse(input) ⇒ Expression^?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Try to parse input into expression

Parameters:

• input (String)

Returns:

• (Expression) —

  if expression is valid

• (nil) —

  otherwise

# File 'lib/mutant/expression/parser.rb', line 42

def try_parse(input)
  expressions = expressions(input)
  case expressions.length
  when 0, 1
    expressions.first
  else
    fail AmbiguousExpressionError, "Ambiguous expression: #{input.inspect}"
  end
end