Class: Mutant::Expression

Inherits:
Object
  • Object
show all
Includes:
AbstractType, Adamantium
Defined in:
lib/mutant/expression.rb,
lib/mutant/expression/method.rb,
lib/mutant/expression/methods.rb,
lib/mutant/expression/namespace.rb

Overview

Abstract base class for match expression

Direct Known Subclasses

Method, Methods, Namespace

Defined Under Namespace

Classes: AmbigousExpressionError, InvalidExpressionError, Method, Methods, Namespace

Constant Summary collapse

SCOPE_NAME_PATTERN = 
/[A-Za-z][A-Za-z\d_]*/.freeze
METHOD_NAME_PATTERN = 
Regexp.union(
  /[A-Za-z_][A-Za-z\d_]*[!?=]?/,
  *AST::Types::OPERATOR_METHODS.map(&:to_s)
).freeze
SCOPE_PATTERN = 
/#{SCOPE_NAME_PATTERN}(?:#{SCOPE_OPERATOR}#{SCOPE_NAME_PATTERN})*/.freeze
REGISTRY = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ 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.

Initialize expression

Parameters:

  • match (MatchData) 


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# File 'lib/mutant/expression.rb', line 32

def initialize(*)
  super
  @syntax = match.to_s
end

Instance Attribute Details

#syntax ⇒ String (readonly)

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.

Return syntax

Returns:

  • (String) 


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# File 'lib/mutant/expression.rb', line 43

def syntax
  @syntax
end

Class Method Details

.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.

Parse input into expression or raise

Parameters:

  • syntax (String)

Returns:

Raises:

  • (RuntimeError) —

    otherwise



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# File 'lib/mutant/expression.rb', line 96

def self.parse(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.

Parse input into expression

Parameters:

  • input (String)

Returns:

  • (Expression) —

    if expression is valid

  • (nil) —

    otherwise



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# File 'lib/mutant/expression.rb', line 112

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

Instance Method Details

#match_length(other) ⇒ Fixnum

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.

Return match length for expression

Parameters:

Returns:

  • (Fixnum) 


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# File 'lib/mutant/expression.rb', line 53

def match_length(other)
  if eql?(other)
    syntax.length
  else
    0
  end
end

#prefix?(other) ⇒ Boolean

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.

Test if expression is prefix

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/mutant/expression.rb', line 69

def prefix?(other)
  !match_length(other).zero?
end