Class: TreeSL

Inherits:
Object
  • Object
show all
Defined in:
lib/treesl.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TreeSL

Returns a new instance of TreeSL.



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# File 'lib/treesl.rb', line 6

def initialize
  @matchers = {}
  @post_procs = {}
  @namespace = TreeSL
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object 



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# File 'lib/treesl.rb', line 71

def method_missing(method, *args)
  rule method, *args
end

Instance Attribute Details

#matchers ⇒ Object

Returns the value of attribute matchers.



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# File 'lib/treesl.rb', line 5

def matchers
  @matchers
end

#namespace ⇒ Object

Returns the value of attribute namespace.



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# File 'lib/treesl.rb', line 5

def namespace
  @namespace
end

#post_procs ⇒ Object

Returns the value of attribute post_procs.



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# File 'lib/treesl.rb', line 5

def post_procs
  @post_procs
end

#root_node ⇒ Object

Returns the value of attribute root_node.



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# File 'lib/treesl.rb', line 5

def root_node
  @root_node
end

Class Method Details

.define(namespace = nil, options = {}, &blk) ⇒ Object 



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# File 'lib/treesl.rb', line 12

def self.define(namespace = nil, options = {}, &blk)
  rdp = TreeSL.new
  rdp.root_node = options[:root] || 'root'
  rdp.namespace = namespace if namespace
  rdp.instance_eval &blk
  rdp
end

Instance Method Details

#match(string, matcher = nil) ⇒ Object 



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# File 'lib/treesl.rb', line 20

def match(string, matcher = nil)
  matcher ||= root_node
  string.strip!
  # p [string,matcher]
  result = if matcher.is_a? Array
    matcher.each do |alternative|
      dup_string = string.dup
      if alternative_match = match(dup_string, alternative)
        string.replace dup_string
        return {alternative => alternative_match} 
      end
    end
    nil
  elsif matcher.is_a? String
    if matcher =~ / /
      matches = matcher.split(' ').inject({}) do |hash, atom|
        hash.merge atom => match(string, atom)
      end
      matches.values.any?{|v| v.nil?} ? nil : matches
    elsif new_matcher = matchers[matcher.to_sym]
      match string, new_matcher
    else
      match string, Regexp.new("^#{matcher}")
    end
  elsif matcher.is_a? Regexp
    if string =~ matcher
      string.gsub!(matcher, '');
      $&
    end
  end
  
  if result && matcher.is_a?(String) && matcher =~ /^[a-z_]+$/ && namespace.const_defined?(matcher.camelcase.to_sym)
    "#{namespace}::#{matcher.to_s.camelcase}".constantize.new(result) rescue result
  else
    result
  end
end

#rule(key, *values) ⇒ Object 



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# File 'lib/treesl.rb', line 58

def rule(key, *values)
  key = key.to_sym
  matchers[key] = if matchers[key].nil?
    if values.length == 1
      values.first
    else
      values
    end
  else
    [matchers[key]].flatten + values
  end
end