Class: Peggy::Production

Inherits:

Reference

• Object
• Element
• Reference
• Peggy::Production

Defined in:

lib/builder.rb,
lib/Copy of builder.rb

Overview

Matcher of a grammar production. The one and only child defines the production.

Instance Attribute Summary

• #child ⇒ Object

  The production definition.

Attributes inherited from Reference

#name

Instance Method Summary

• #initialize(name = nil, child = nil) ⇒ Production constructor

  Init the name and child.

• #match(parser, index) ⇒ Object

  Match the production one time.

Methods inherited from Reference

#to_s

Methods inherited from Element

build, #report

Constructor Details

#initialize(name = nil, child = nil) ⇒ Production

Init the name and child.

# File 'lib/builder.rb', line 191

def initialize name=nil, child=nil
  super name
  @child = child
end

Instance Attribute Details

#child ⇒ Object

The production definition.

# File 'lib/builder.rb', line 188

def child
  @child
end

Instance Method Details

#match(parser, index) ⇒ Object

Match the production one time. If it matches the end index is returned. If not, NO_MATCH is returned.

# File 'lib/builder.rb', line 201

def match parser, index
  raise "production name not set" unless name
  raise "production child not set" unless child
  report @child.match(parser, index)
end