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##
## $Release: 2.7.0 $
## copyright(c) 2006-2011 kuwata-lab.com all rights reserved.
##
require 'erubis/engine'
require 'erubis/enhancer'
module Erubis
module SchemeGenerator
include Generator
def self.supported_properties() # :nodoc:
return [
[:func, '_add', "function name (ex. 'display')"],
]
end
def init_generator(properties={})
super
@escapefunc ||= 'escape'
@func = properties[:func] || '_add' # or 'display'
end
def add_preamble(src)
return unless @func == '_add'
src << "(let ((_buf '())) " + \
"(define (_add x) (set! _buf (cons x _buf))) "
#src << "(let* ((_buf '())" + \
# " (_add (lambda (x) (set! _buf (cons x _buf))))) "
end
def escape_text(text)
@table_ ||= { '"'=>'\\"', '\\'=>'\\\\' }
text.gsub!(/["\\]/) { |m| @table_[m] }
return text
end
def escaped_expr(code)
code.strip!
return "(#{@escapefunc} #{code})"
end
def add_text(src, text)
return if text.empty?
t = escape_text(text)
if t[-1] == ?\n
t[-1, 1] = ''
src << "(#{@func} \"" << t << "\\n\")\n"
else
src << "(#{@func} \"" << t << '")'
end
end
def add_stmt(src, code)
src << code
end
def add_expr_literal(src, code)
code.strip!
src << "(#{@func} #{code})"
end
def add_expr_escaped(src, code)
add_expr_literal(src, escaped_expr(code))
end
def add_expr_debug(src, code)
s = (code.strip! || code).gsub(/\"/, '\\"')
src << "(display \"*** debug: #{s}=\")(display #{code.strip})(display \"\\n\")"
end
def add_postamble(src)
return unless @func == '_add'
src << "\n" unless src[-1] == ?\n
src << " (reverse _buf))\n"
end
end
##
## engine for Scheme
##
class Escheme < Basic::Engine
include SchemeGenerator
end
class EscapedEscheme < Escheme
include EscapeEnhancer
end
#class XmlEscheme < Escheme
# include EscapeEnhancer
#end
class PI::Escheme < PI::Engine
include SchemeGenerator
def init_converter(properties={})
@pi = 'scheme'
super(properties)
end
end
end
|
