method

parse_ctype

v2_5_5 - Show latest stable - 0 notes - Class: CParser

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What's this?

parse_ctype(ty, tymap=nil) public

Given a String of C type ty, returns the corresponding Fiddle constant.

ty can also accept an Array of C type Strings, and will be returned in a corresponding Array.

If Hash tymap is provided, ty is expected to be the key, and the value will be the C type to be looked up.

Example:

require 'fiddle/import'

include Fiddle::CParser
  #=> Object

parse_ctype('int')
  #=> Fiddle::TYPE_INT

parse_ctype('double diff')
  #=> Fiddle::TYPE_DOUBLE

parse_ctype('unsigned char byte')
  #=> -Fiddle::TYPE_CHAR

parse_ctype('const char* const argv[]')
  #=> -Fiddle::TYPE_VOIDP

Show source

# File ext/fiddle/lib/fiddle/cparser.rb, line 124
    def parse_ctype(ty, tymap=nil)
      tymap ||= {}
      case ty
      when Array
        return [parse_ctype(ty[0], tymap), ty[1]]
      when 'void'
        return TYPE_VOID
      when /^(?:(?:signed\s+)?long\s+long(?:\s+int\s+)?|int64_t)(?:\s+\w+)?$/
        if( defined?(TYPE_LONG_LONG) )
          return TYPE_LONG_LONG
        else
          raise(RuntimeError, "unsupported type: #{ty}")
        end
      when /^(?:unsigned\s+long\s+long(?:\s+int\s+)?|uint64_t)(?:\s+\w+)?$/
        if( defined?(TYPE_LONG_LONG) )
          return -TYPE_LONG_LONG
        else
          raise(RuntimeError, "unsupported type: #{ty}")
        end
      when /^(?:signed\s+)?long(?:\s+int\s+)?(?:\s+\w+)?$/
        return TYPE_LONG
      when /^unsigned\s+long(?:\s+int\s+)?(?:\s+\w+)?$/
        return -TYPE_LONG
      when /^(?:signed\s+)?int(?:\s+\w+)?$/
        return TYPE_INT
      when /^(?:unsigned\s+int|uint)(?:\s+\w+)?$/
        return -TYPE_INT
      when /^(?:signed\s+)?short(?:\s+int\s+)?(?:\s+\w+)?$/
        return TYPE_SHORT
      when /^unsigned\s+short(?:\s+int\s+)?(?:\s+\w+)?$/
        return -TYPE_SHORT
      when /^(?:signed\s+)?char(?:\s+\w+)?$/
        return TYPE_CHAR
      when /^unsigned\s+char(?:\s+\w+)?$/
        return  -TYPE_CHAR
      when /^float(?:\s+\w+)?$/
        return TYPE_FLOAT
      when /^double(?:\s+\w+)?$/
        return TYPE_DOUBLE
      when /^size_t(?:\s+\w+)?$/
        return TYPE_SIZE_T
      when /^ssize_t(?:\s+\w+)?$/
        return TYPE_SSIZE_T
      when /^ptrdiff_t(?:\s+\w+)?$/
        return TYPE_PTRDIFF_T
      when /^intptr_t(?:\s+\w+)?$/
        return TYPE_INTPTR_T
      when /^uintptr_t(?:\s+\w+)?$/
        return TYPE_UINTPTR_T
      when /\*/, /\[[\s\d]*\]/
        return TYPE_VOIDP
      else
        ty = ty.split(' ', 2)[0]
        if( tymap[ty] )
          return parse_ctype(tymap[ty], tymap)
        else
          raise(DLError, "unknown type: #{ty}")
        end
      end
    end

parse_ctype

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