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# frozen_string_literal: true
module Fiddle
# A mixin that provides methods for parsing C struct and prototype signatures.
#
# == Example
# require 'fiddle/import'
#
# include Fiddle::CParser
# #=> Object
#
# parse_ctype('int')
# #=> Fiddle::TYPE_INT
#
# parse_struct_signature(['int i', 'char c'])
# #=> [[Fiddle::TYPE_INT, Fiddle::TYPE_CHAR], ["i", "c"]]
#
# parse_signature('double sum(double, double)')
# #=> ["sum", Fiddle::TYPE_DOUBLE, [Fiddle::TYPE_DOUBLE, Fiddle::TYPE_DOUBLE]]
#
module CParser
# Parses a C struct's members
#
# Example:
# require 'fiddle/import'
#
# include Fiddle::CParser
# #=> Object
#
# parse_struct_signature(['int i', 'char c'])
# #=> [[Fiddle::TYPE_INT, Fiddle::TYPE_CHAR], ["i", "c"]]
#
# parse_struct_signature(['char buffer[80]'])
# #=> [[[Fiddle::TYPE_CHAR, 80]], ["buffer"]]
#
def parse_struct_signature(signature, tymap=nil)
if signature.is_a?(String)
signature = split_arguments(signature, /[,;]/)
end
mems = []
tys = []
signature.each{|msig|
msig = compact(msig)
case msig
when /^[\w\*\s]+[\*\s](\w+)$/
mems.push($1)
tys.push(parse_ctype(msig, tymap))
when /^[\w\*\s]+\(\*(\w+)\)\(.*?\)$/
mems.push($1)
tys.push(parse_ctype(msig, tymap))
when /^([\w\*\s]+[\*\s])(\w+)\[(\d+)\]$/
mems.push($2)
tys.push([parse_ctype($1.strip, tymap), $3.to_i])
when /^([\w\*\s]+)\[(\d+)\](\w+)$/
mems.push($3)
tys.push([parse_ctype($1.strip, tymap), $2.to_i])
else
raise(RuntimeError,"can't parse the struct member: #{msig}")
end
}
return tys, mems
end
# Parses a C prototype signature
#
# If Hash +tymap+ is provided, the return value and the arguments from the
# +signature+ are expected to be keys, and the value will be the C type to
# be looked up.
#
# Example:
# require 'fiddle/import'
#
# include Fiddle::CParser
# #=> Object
#
# parse_signature('double sum(double, double)')
# #=> ["sum", Fiddle::TYPE_DOUBLE, [Fiddle::TYPE_DOUBLE, Fiddle::TYPE_DOUBLE]]
#
# parse_signature('void update(void (*cb)(int code))')
# #=> ["update", Fiddle::TYPE_VOID, [Fiddle::TYPE_VOIDP]]
#
# parse_signature('char (*getbuffer(void))[80]')
# #=> ["getbuffer", Fiddle::TYPE_VOIDP, []]
#
def parse_signature(signature, tymap=nil)
tymap ||= {}
case compact(signature)
when /^(?:[\w\*\s]+)\(\*(\w+)\((.*?)\)\)(?:\[\w*\]|\(.*?\));?$/
func, args = $1, $2
return [func, TYPE_VOIDP, split_arguments(args).collect {|arg| parse_ctype(arg, tymap)}]
when /^([\w\*\s]+[\*\s])(\w+)\((.*?)\);?$/
ret, func, args = $1.strip, $2, $3
return [func, parse_ctype(ret, tymap), split_arguments(args).collect {|arg| parse_ctype(arg, tymap)}]
else
raise(RuntimeError,"can't parse the function prototype: #{signature}")
end
end
# Given a String of C type +ty+, returns the corresponding Fiddle constant.
#
# +ty+ can also accept an Array of C type Strings, and will be returned in
# a corresponding Array.
#
# If Hash +tymap+ is provided, +ty+ is expected to be the key, and the
# value will be the C type to be looked up.
#
# Example:
# require 'fiddle/import'
#
# include Fiddle::CParser
# #=> Object
#
# parse_ctype('int')
# #=> Fiddle::TYPE_INT
#
# parse_ctype('double diff')
# #=> Fiddle::TYPE_DOUBLE
#
# parse_ctype('unsigned char byte')
# #=> -Fiddle::TYPE_CHAR
#
# parse_ctype('const char* const argv[]')
# #=> -Fiddle::TYPE_VOIDP
#
def parse_ctype(ty, tymap=nil)
tymap ||= {}
case ty
when Array
return [parse_ctype(ty[0], tymap), ty[1]]
when 'void'
return TYPE_VOID
when /^(?:(?:signed\s+)?long\s+long(?:\s+int\s+)?|int64_t)(?:\s+\w+)?$/
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
private
def split_arguments(arguments, sep=',')
return [] if arguments.strip == 'void'
arguments.scan(/([\w\*\s]+\(\*\w*\)\(.*?\)|[\w\*\s\[\]]+)(?:#{sep}\s*|$)/).collect {|m| m[0]}
end
def compact(signature)
signature.gsub(/\s+/, ' ').gsub(/\s*([\(\)\[\]\*,;])\s*/, '\1').strip
end
end
end
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