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#! /your/favourite/path/to/ruby
# -*- mode: ruby; coding: utf-8; indent-tabs-mode: nil; ruby-indent-level: 2 -*-
# -*- frozen_string_literal: true; -*-
# -*- warn_indent: true; -*-
#
# Copyright (c) 2017 Urabe, Shyouhei. All rights reserved.
#
# This file is a part of the programming language Ruby. Permission is hereby
# granted, to either redistribute and/or modify this file, provided that the
# conditions mentioned in the file COPYING are met. Consult the file for
# details.
require 'pathname'
require 'erb'
require_relative 'c_escape'
class RubyVM::Dumper
include RubyVM::CEscape
# I learned this handy "super-private" maneuver from @a_matsuda
# cf: https://github.com/rails/rails/pull/27363/files
using Module.new {
refine RubyVM::Dumper do
private
def new_binding
# This `eval 'binding'` does not return the current binding
# but creates one on top of it.
return eval 'binding'
end
def new_erb spec
path = Pathname.new __dir__
path += '../views'
path += spec
src = path.read mode: 'rt:utf-8:utf-8'
rescue Errno::ENOENT
raise "don't know how to generate #{path}"
else
erb = ERB.new src, nil, '%-'
erb.filename = path.realpath.to_path
return erb
end
def finderb spec
return @erb.fetch spec do |k|
erb = new_erb k
@erb[k] = erb
end
end
def replace_pragma_line str, lineno
if str == "#pragma RubyVM reset source\n" then
return "#line #{lineno + 2} #{@file}\n"
else
return str
end
end
public
def do_render source, locals
erb = finderb source
bnd = @empty.dup
locals.each_pair do |k, v|
bnd.local_variable_set k, v
end
return erb.result bnd
end
def replace_pragma str
return str \
. each_line \
. with_index \
. map {|i, j| replace_pragma_line i, j } \
. join
end
end
}
def initialize path
@erb = {}
@empty = new_binding
dst = Pathname.new Dir.getwd
dst += path
@file = cstr dst.realdirpath.to_path
end
def render partial, locals: {}
return do_render "_#{partial}.erb", locals
end
def generate template
str = do_render "#{template}.erb", {}
return replace_pragma str
end
private
# view helpers
alias cstr rstring2cstr
alias comm commentify
def render_c_expr expr
render 'c_expr', locals: { expr: expr, }
end
end
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