Class: Gloo::Core::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/gloo/core/parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(engine) ⇒ Parser

Set up the parser.



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# File 'lib/gloo/core/parser.rb', line 15

def initialize( engine )
  @engine = engine
  @engine.log.debug 'parser intialized...'
end

Instance Method Details

#parse_immediate(full_cmd) ⇒ Object

Parse a command from the immediate execution context.



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# File 'lib/gloo/core/parser.rb', line 23

def parse_immediate( full_cmd )
  # Break the full command into verb and params
  cmd, params = split_params full_cmd

  # Params are the parenthetical part of the command at the end
  params = Gloo::Core::Tokens.new( params ) if params
  tokens = Gloo::Core::Tokens.new( cmd )
  dic = Gloo::Core::Dictionary.instance
  verb = dic.find_verb( tokens.verb )
  return verb.new( @engine, tokens, params ) if verb

  @engine.log.error "Verb '#{tokens.verb}' was not found."
  return nil
end

#run(cmd) ⇒ Object

Parse a command and then run it if it parsed correctly.



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# File 'lib/gloo/core/parser.rb', line 56

def run( cmd )
  v = parse_immediate( cmd )
  Gloo::Exec::Runner.go( @engine, v ) if v
end

#split_params(cmd) ⇒ Object

If additional params were provided, split them out from the token list.



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# File 'lib/gloo/core/parser.rb', line 42

def split_params( cmd )
  params = nil
  i = cmd.rindex( '(' )
  if i && cmd.strip.end_with?( ')' )
    pstr = cmd[ i + 1..-1 ]
    params = pstr.strip[ 0..-2 ] if pstr
    cmd = cmd[ 0, i].strip
  end
  return cmd, params
end