Class: DBus::Type::Parser

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

Overview

D-Bus type parser class

Helper class to parse a type signature in the protocol.

Instance Method Summary collapse

Constructor Details

#initialize(signature) ⇒ Parser

Create a new parser for the given signature.



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# File 'lib/dbus/type.rb', line 126

def initialize(signature)
  @signature = signature
  @idx = 0
end

Instance Method Details

#nextchar ⇒ Object

Returns the next character from the signature.



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# File 'lib/dbus/type.rb', line 132

def nextchar
  c = @signature[@idx]
  @idx += 1
  c
end

#parse ⇒ Object

Parse the entire signature, return a DBus::Type object.



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# File 'lib/dbus/type.rb', line 167

def parse
  @idx = 0
  ret = []
  while (c = nextchar)
    ret << parse_one(c)
  end
  ret
end

#parse_one(c) ⇒ Object

Parse one character c of the signature.



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# File 'lib/dbus/type.rb', line 139

def parse_one(c)
  res = nil
  case c
  when "a"
    res = Type.new(ARRAY)
    c = nextchar
    raise SignatureException, "Parse error in #{@signature}" if c.nil?
    child = parse_one(c)
    res << child
  when "("
    res = Type.new(STRUCT)
    while (c = nextchar) && c != ")"
      res << parse_one(c)
    end
    raise SignatureException, "Parse error in #{@signature}" if c.nil?
  when "{"
    res = Type.new(DICT_ENTRY)
    while (c = nextchar) && c != "}"
      res << parse_one(c)
    end
    raise SignatureException, "Parse error in #{@signature}" if c.nil?
  else
    res = Type.new(c)
  end
  res
end