Module: DL::CParser

Included in:
Importer
Defined in:
lib/dl/cparser.rb

Overview

Methods for parsing C struct and C prototype signatures.

Instance Method Summary collapse

Instance Method Details

#parse_ctype(ty, tymap = nil) ⇒ Object

Given a String of C type ty, return the corresponding DL constant.

ty can also accept an Array of C type Strings, and will 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:

parse_ctype('int')
=> DL::TYPE_INT

parse_ctype('double')
=> DL::TYPE_DOUBLE

parse_ctype('unsigned char')
=> -DL::TYPE_CHAR


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# File 'lib/dl/cparser.rb', line 96

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 "char"
    return TYPE_CHAR
  when "unsigned char"
    return  -TYPE_CHAR
  when "short"
    return TYPE_SHORT
  when "unsigned short"
    return -TYPE_SHORT
  when "int"
    return TYPE_INT
  when "unsigned int", 'uint'
    return -TYPE_INT
  when "long"
    return TYPE_LONG
  when "unsigned long"
    return -TYPE_LONG
  when "long long"
    if( defined?(TYPE_LONG_LONG) )
      return TYPE_LONG_LONG
    else
      raise(RuntimeError, "unsupported type: #{ty}")
    end
  when "unsigned long long"
    if( defined?(TYPE_LONG_LONG) )
      return -TYPE_LONG_LONG
    else
      raise(RuntimeError, "unsupported type: #{ty}")
    end
  when "float"
    return TYPE_FLOAT
  when "double"
    return TYPE_DOUBLE
  when "size_t"
    return TYPE_SIZE_T
  when "ssize_t"
    return TYPE_SSIZE_T
  when "ptrdiff_t"
    return TYPE_PTRDIFF_T
  when "intptr_t"
    return TYPE_INTPTR_T
  when "uintptr_t"
    return TYPE_UINTPTR_T
  when /\*/, /\[\s*\]/
    return TYPE_VOIDP
  else
    if( tymap[ty] )
      return parse_ctype(tymap[ty], tymap)
    else
      raise(DLError, "unknown type: #{ty}")
    end
  end
end

#parse_signature(signature, tymap = nil) ⇒ Object

Parses a C prototype signature

Example:

include DL::CParser
=> Object

parse_signature('double sum(double, double)')
=> ["sum", DL::TYPE_DOUBLE, [DL::TYPE_DOUBLE, DL::TYPE_DOUBLE]]


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# File 'lib/dl/cparser.rb', line 56

def parse_signature(signature, tymap=nil)
  tymap ||= {}
  signature = signature.gsub(/\s+/, " ").strip
  case signature
  when /^([\w@\*\s]+)\(([\w\*\s\,\[\]]*)\)$/
    ret = $1
    (args = $2).strip!
    ret = ret.split(/\s+/)
    args = args.split(/\s*,\s*/)
    func = ret.pop
    if( func =~ /^\*/ )
      func.gsub!(/^\*+/,"")
      ret.push("*")
    end
    ret  = ret.join(" ")
    return [func, parse_ctype(ret, tymap), args.collect{|arg| parse_ctype(arg, tymap)}]
  else
    raise(RuntimeError,"can't parse the function prototype: #{signature}")
  end
end

#parse_struct_signature(signature, tymap = nil) ⇒ Object

Parses a C struct's members

Example:

parse_struct_signature(['int i', 'char c'])
=> [[DL::TYPE_INT, DL::TYPE_CHAR], ["i", "c"]]


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# File 'lib/dl/cparser.rb', line 11

def parse_struct_signature(signature, tymap=nil)
  if( signature.is_a?(String) )
    signature = signature.split(/\s*,\s*/)
  end
  mems = []
  tys  = []
  signature.each{|msig|
    tks = msig.split(/\s+(\*)?/)
    ty = tks[0..-2].join(" ")
    member = tks[-1]

    case ty
    when /\[(\d+)\]/
      n = $1.to_i
      ty.gsub!(/\s*\[\d+\]/,"")
      ty = [ty, n]
    when /\[\]/
      ty.gsub!(/\s*\[\]/, "*")
    end

    case member
    when /\[(\d+)\]/
      ty = [ty, $1.to_i]
      member.gsub!(/\s*\[\d+\]/,"")
    when /\[\]/
      ty = ty + "*"
      member.gsub!(/\s*\[\]/, "")
    end

    mems.push(member)
    tys.push(parse_ctype(ty,tymap))
  }
  return tys, mems
end