Class: Versionomy::Format::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/versionomy/format/base.rb

Overview

The base format.

This format doesn't actually do anything useful. It causes all strings to parse to the schema's default value, and unparses all values to the empty string. Instead, the purpose here is to define the API for a format.

All formats must define the methods schema, parse, and unparse. It is also recommended that formats define the === method, though this is not strictly required. Finally, formats may optionally implement uparse_for_serialize.

Formats need not extend this base class, as long as they duck-type these methods.

Direct Known Subclasses

Delimiter

Instance Method Summary collapse

Constructor Details

#initialize(schema_) ⇒ Base

Create an instance of this base format, with the given schema.



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# File 'lib/versionomy/format/base.rb', line 62

def initialize(schema_)
  @_schema = schema_
end

Instance Method Details

#===(obj_) ⇒ Object

Determine whether the given value uses this format.



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# File 'lib/versionomy/format/base.rb', line 131

def ===(obj_)
  if obj_.kind_of?(Value)
    obj_.format == self
  else
    obj_ == self
  end
end

#inspectObject

:nodoc:



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# File 'lib/versionomy/format/base.rb', line 67

def inspect   # :nodoc:
  "#<#{self.class}:0x#{object_id.to_s(16)} schema=#{@_schema.inspect}>"
end

#parse(string_, params_ = nil) ⇒ Object

Parse the given string and return a value.

The optional parameter hash can be used to pass parameters to the parser to affect its behavior. The exact parameters supported are defined by the format.



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# File 'lib/versionomy/format/base.rb', line 89

def parse(string_, params_=nil)
  Value.new([], self)
end

#schemaObject

Returns the schema understood by this format.



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# File 'lib/versionomy/format/base.rb', line 78

def schema
  @_schema
end

#to_sObject

:nodoc:



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# File 'lib/versionomy/format/base.rb', line 71

def to_s   # :nodoc:
  inspect
end

#unparse(value_, params_ = nil) ⇒ Object

Unparse the given value and return a string.

The optional parameter hash can be used to pass parameters to the unparser to affect its behavior. The exact parameters supported are defined by the format.



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# File 'lib/versionomy/format/base.rb', line 100

def unparse(value_, params_=nil)
  ''
end

#unparse_for_serialization(value_) ⇒ Object

An optional method that does unparsing especially for serialization. Implement this if normal unparsing is “lossy” and doesn't guarantee reconstruction of the version number. This method should attempt to unparse in such a way that the entire version value can be reconstructed from the unparsed string. Serialization routines will first attempt to call this method to unparse for serialization. If this method is not present, the normal unparse method will be used.

Return either the unparsed string, or an array consisting of the unparsed string and a hash of parse params to pass to the parser when the string is to be reconstructed. You may also either return nil or raise Versionomy::Errors::UnparseError if the unparsing cannot be done satisfactorily for serialization. In this case, serialization will be done using the raw value data rather than an unparsed string.

This default implementation just turns around and calls unparse. Thus it is equivalent to the method not being present at all.



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# File 'lib/versionomy/format/base.rb', line 124

def unparse_for_serialization(value_)
  unparse(value_)
end