ruby/template/prelude.c.tmpl

<%
# This file is interpreted by $(BASERUBY) and miniruby.
# $(BASERUBY) is used for miniprelude.c.
# miniruby is used for prelude.c.
# Since $(BASERUBY) may be older than Ruby 1.9,
# Ruby 1.9 feature should not be used.

class Prelude
  C_ESC = {
    "\\" => "\\\\",
    '"' => '\"',
    "\n" => '\n',
  }

  0x00.upto(0x1f) {|ch| C_ESC[[ch].pack("C")] ||= "\\%03o" % ch }
  0x7f.upto(0xff) {|ch| C_ESC[[ch].pack("C")] = "\\%03o" % ch }
  C_ESC_PAT = Regexp.union(*C_ESC.keys)

  def c_esc(str)
    '"' + str.gsub(C_ESC_PAT) { C_ESC[$&] } + '"'
  end
  def prelude_base(filename)
    filename.chomp(".rb")
  end
  def prelude_name(filename)
    "<internal:" + prelude_base(filename) + ">"
  end

  def initialize(init_name, preludes, vpath)
    @init_name = init_name
    @have_sublib = false
    @vpath = vpath
    @preludes = {}
    @mains = preludes.map {|filename| translate(filename)[0]}
    @preludes.delete_if {|_, (_, _, lines, sub)| sub && lines.empty?}
  end

  def translate(filename, sub = false)
    idx = @preludes[filename]
    return idx if idx
    lines = []
    result = [@preludes.size, @vpath.strip(filename), lines, sub]
    @vpath.foreach(filename) do |line|
      @preludes[filename] ||= result
      line.sub!(/(?:^|\s+)\#(?:$|[#\s].*)/, '')
      line.sub!(/require(_relative)?\s*\(?\s*(["'])(.*?)(?:\.rb)?\2\)?/) do
        orig, rel, path = $&, $2, $3
        if rel
          path = File.join(File.dirname(filename), path)
          nil while path.gsub!(%r'(\A|/)(?!\.\.?/)[^/]+/\.\.(?:/|\z)', '')
        end
        path = translate("#{path}.rb", true) rescue nil
        if path
          @have_sublib = true
          "TMP_RUBY_PREFIX.require(#{path[0]})"
        else
          orig
        end
      end
      lines << c_esc(line)
    end
    result
  end
end
Prelude.new(output && output[/\w+(?=_prelude.c\b)/] || 'prelude', ARGV, vpath).instance_eval do
-%>
/* -*-c-*-
 THIS FILE WAS AUTOGENERATED BY template/prelude.c.tmpl. DO NOT EDIT.

 sources: <%= @preludes.map {|n,*| prelude_base(n)}.join(', ') %>
*/
%unless @preludes.empty?
#include "ruby/ruby.h"
#include "internal.h"
#include "vm_core.h"

% preludes = @preludes.values.sort
% preludes.each {|i, prelude, lines, sub|

static const char prelude_name<%=i%>[] = <%=c_esc(prelude_name(*prelude))%>;
static const char prelude_code<%=i%>[] =
%   lines.each {|line|
<%=line%>
%   }
;
% }

% if @have_sublib
#define PRELUDE_COUNT <%=preludes.size%>

struct prelude_env {
    volatile VALUE prefix_path;
#if PRELUDE_COUNT > 0
    char loaded[PRELUDE_COUNT];
#endif
};

static VALUE
prelude_prefix_path(VALUE self)
{
    struct prelude_env *ptr = DATA_PTR(self);
    return ptr->prefix_path;
}
% end

% unless preludes.empty?
static void
prelude_eval(VALUE code, VALUE name, VALUE line)
{
    rb_iseq_eval(rb_iseq_compile_with_option(code, name, Qnil, line, 0, Qtrue));
}
% end

% if @have_sublib
static VALUE
prelude_require(VALUE self, VALUE nth)
{
    struct prelude_env *ptr = DATA_PTR(self);
    VALUE code, name;
    int n = FIX2INT(nth);

    if (n > PRELUDE_COUNT) return Qfalse;
    if (ptr->loaded[n]) return Qfalse;
    ptr->loaded[n] = 1;
    switch (n) {
%   @preludes.each_value do |i, prelude, lines, sub|
%     if sub
      case <%=i%>:
	code = rb_usascii_str_new(prelude_code<%=i%>, sizeof(prelude_code<%=i%>) - 1);
        name = rb_usascii_str_new(prelude_name<%=i%>, sizeof(prelude_name<%=i%>) - 1);
	break;
%     end
%   end
      default:
	return Qfalse;
    }
    prelude_eval(code, name, INT2FIX(1));
    return Qtrue;
}

% end
%end
void
Init_<%=@init_name%>(void)
{
%unless @preludes.empty?
% if @have_sublib
    struct prelude_env memo;
    ID name = rb_intern("TMP_RUBY_PREFIX");
    VALUE prelude = Data_Wrap_Struct(rb_cData, 0, 0, &memo);

    memo.prefix_path = rb_const_remove(rb_cObject, name);
    rb_const_set(rb_cObject, name, prelude);
    rb_define_singleton_method(prelude, "to_s", prelude_prefix_path, 0);
% end
% if @have_sublib
    memset(memo.loaded, 0, sizeof(memo.loaded));
    rb_define_singleton_method(prelude, "require", prelude_require, 1);
% end
% preludes.each do |i, prelude, lines, sub|
%   next if sub
    prelude_eval(
      rb_usascii_str_new(prelude_code<%=i%>, sizeof(prelude_code<%=i%>) - 1),
      rb_usascii_str_new(prelude_name<%=i%>, sizeof(prelude_name<%=i%>) - 1),
      INT2FIX(1));
% end
% if @have_sublib
    rb_gc_force_recycle(prelude);
% end

#if 0
% preludes.length.times {|i|
    puts(prelude_code<%=i%>);
% }
#endif
%end
}
<%end -%>