Class: Papercraft::CompilerOld

Inherits:
Object
  • Object
show all
Defined in:
lib/papercraft/compiler_old.rb

Overview

The Compiler class compiles Papercraft templates

Constant Summary collapse

DEFAULT_CODE_BUFFER_CAPACITY = 
8192
DEFAULT_EMIT_BUFFER_CAPACITY = 
4096

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CompilerOld

Returns a new instance of CompilerOld.



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# File 'lib/papercraft/compiler_old.rb', line 32

def initialize
  @level = 0
  @code_buffer = String.new(capacity: DEFAULT_CODE_BUFFER_CAPACITY)
  @sub_templates = []
end

Instance Attribute Details

#code_buffer ⇒ Object (readonly)

Returns the value of attribute code_buffer.



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# File 'lib/papercraft/compiler_old.rb', line 157

def code_buffer
  @code_buffer
end

Class Method Details

.pp_ast(node, level = 0) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 686

def self.pp_ast(node, level = 0)
  case node
  when RubyVM::AbstractSyntaxTree::Node
    puts "#{'  ' * level}#{node.type.inspect}"
    node.children.each { |c| pp_ast(c, level + 1) }
  when Array
    puts "#{'  ' * level}["
    node.each { |c| pp_ast(c, level + 1) }
    puts "#{'  ' * level}]"
  else
    puts "#{'  ' * level}#{node.inspect}"
    return
  end
end

Instance Method Details

#__html_encode__(str) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 106

def __html_encode__(str)
  CGI.escapeHTML(str)
end

#__uri_encode__(str) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 110

def __uri_encode__(str)
  EscapeUtils.escape_uri(str)
end

#compile(template, initial_level = 0) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 145

def compile(template, initial_level = 0)
  @block = template.to_proc
  @level = initial_level
  ast = RubyVM::AbstractSyntaxTree.of(@block)
  Compiler.pp_ast(ast) if ENV['DEBUG'] == '1'
  @level += 1
  parse(ast)
  flush_emit_buffer
  @level -= 1
  self
end

#convert_sub_template(template) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 178

def convert_sub_template(template)
  template.compile(@level + 2).to_code
end

#emit_buffer ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 51

def emit_buffer
  @emit_buffer ||= String.new(capacity: DEFAULT_EMIT_BUFFER_CAPACITY)
end

#emit_code(code) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 132

def emit_code(code)
  if flush_emit_buffer || @line_break
    emit_code_line_break if @line_break
    @code_buffer << "#{'  ' * @level}#{code}"
  else
    if @code_buffer.empty? || (@code_buffer[-1] == "\n")
      @code_buffer << "#{'  ' * @level}#{code}"
    else
      @code_buffer << "#{code}"
    end
  end
end

#emit_code_block(block) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 364

def emit_code_block(block)
  emit_code(" {\n")
  @level += 1
  parse(block.children[2])
  flush_emit_buffer
  @level -= 1
  emit_code("}")
end

#emit_code_line_break ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 44

def emit_code_line_break
  return if @code_buffer.empty?

  @code_buffer << "\n" if @code_buffer[-1] != "\n"
  @line_break = nil
end

#emit_emit(args, block) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 319

def emit_emit(args, block)
  value, *rest = args.children.compact
  case value.type
  when :STR, :LIT, :SYM
    value = value.children.first.to_s
    emit_output { emit_literal(value) }
  when :VCALL
    emit_code("__buffer__ << #{value.children.first}\n")
  when :DVAR
    emit_code("Papercraft.__emit__(#{value.children.first}, __buffer__")
    if !rest.empty?
      emit_code(", ")
      parse_list(args, false, 1..-1)
    end
    emit_code(")\n")
  when :CONST
    name = value.children.first.to_s
    value = get_const(name)
    case value
    when Papercraft::Template, Proc
      value = Papercraft.html(&value) if value.is_a?(Proc)
      @sub_templates << value
      idx = @sub_templates.size - 1
      @line_break = false
      emit_code("__sub_templates__[#{idx}].(__buffer__")
      if !rest.empty?
        emit_code(", ")
        parse_list(args, false, 1..-1)
      end  
      emit_code(")")
      emit_code_block(block) if block
      emit_code("\n")
    else
      emit_output { emit_literal(value) }
    end
  else
    raise NotImplementedError
  end

  # value = fcall_inner_text_from_args(args)
  # emit_output do
  #   emit_literal(value)
  # end
end

#emit_emit_yield ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 373

def emit_emit_yield
  emit_code("__block__.call\n")
end

#emit_expression ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 114

def emit_expression
  if @output_mode
    emit_literal('#{CGI.escapeHTML((')
    yield
    emit_literal(').to_s)}')
  else
    yield
  end
end

#emit_html5(node, block = nil) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 296

def emit_html5(node, block = nil)
  emit_output do
    emit_literal('<!DOCTYPE html>')
  end
  emit_tag(:html, nil) { parse(block) } if block
end

#emit_if_code(cond, then_branch, else_branch) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 594

def emit_if_code(cond, then_branch, else_branch)
  emit_code('if ')
  parse(cond)
  emit_code("\n")
  @level += 1
  parse(then_branch)
  flush_emit_buffer
  @level -= 1
  if else_branch
    emit_code("else\n")
    @level += 1
    parse(else_branch)
    flush_emit_buffer
    @level -= 1
  end
  emit_code("end\n")
end

#emit_if_output(cond, then_branch, else_branch) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 570

def emit_if_output(cond, then_branch, else_branch)
  parse(cond)
  emit_literal(" ? ")
  parse(then_branch)
  emit_literal(" : ")
  if else_branch
    parse(else_branch)
  else
    emit_literal(nil)
  end
end

#emit_literal(lit) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 55

def emit_literal(lit)
  if @output_mode
    emit_code_line_break if @line_break
    emit_buffer << lit
  else
    emit_code(lit)
  end
end

#emit_output ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 38

def emit_output
  @output_mode = true
  yield
  @output_mode = false
end

#emit_tag(tag, atts, &block) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 303

def emit_tag(tag, atts, &block)
  emit_output do
    if atts
      emit_literal("<#{tag}")
      emit_tag_attributes(atts)
      emit_literal(block ? '>' : '/>')
    else
      emit_literal(block ? "<#{tag}>" : "<#{tag}/>")
    end
  end
  if block
    block.call
    emit_output { emit_literal("</#{tag}>") }
  end
end

#emit_tag_attribute_key(key) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 400

def emit_tag_attribute_key(key)
  case key.type
  when :STR
    emit_literal(key.children.first)
  when :LIT, :SYM
    emit_literal(key.children.first.to_s)
  when :NIL
    emit_literal('nil')
  else
    emit_expression { parse(key) }
  end
end

#emit_tag_attribute_value(value, key) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 413

def emit_tag_attribute_value(value, key)
  case value.type
  when :STR
    type = key.type
    is_href_attr = (type == :LIT || type == :SYM) && (key.children.first == :href)
    encoding = is_href_attr ? :uri : :html
    emit_text(value.children.first, encoding: encoding)
  when :LIT, :SYM
    emit_text(value.children.first.to_s)
  else
    parse(value)
  end
end

#emit_tag_attributes(atts) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 377

def emit_tag_attributes(atts)
  list = atts.children.first.children
  while true
    key = list.shift
    break unless key

    value = list.shift
    value_type = value.type
    case value_type
    when :FALSE, :NIL
      next
    end

    emit_literal(' ')
    emit_tag_attribute_key(key)
    next if value_type == :TRUE

    emit_literal('=\"')
    emit_tag_attribute_value(value, key)
    emit_literal('\"')
  end
end

#emit_text(str, encoding: :html) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 64

def emit_text(str, encoding: :html)
  emit_code_line_break if @line_break
  emit_buffer << encode(str, encoding).inspect[1..-2]
end

#emit_text_fcall(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 69

def emit_text_fcall(node)
  case node.type
  when :STR, :LIT, :SYM
    value = node.children.first.to_s
    emit_text(value, encoding: :html)
  when :VCALL
    emit_code("__buffer__ << CGI.escapeHTML((#{node.children.first}).to_s)\n")
  when :CONST
    name = node.children.first.to_s
    value = get_const(name)
    emit_text(value, encoding: :html)
  else
    raise NotImplementedError
  end
end

#emit_unless_code(cond, then_branch, else_branch) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 612

def emit_unless_code(cond, then_branch, else_branch)
  emit_code('unless ')
  parse(cond)
  emit_code("\n")
  @level += 1
  parse(then_branch)
  flush_emit_buffer
  @level -= 1
  if else_branch
    emit_code("else\n")
    @level += 1
    parse(else_branch)
    flush_emit_buffer
    @level -= 1
  end
  emit_code("end\n")
end

#emit_unless_output(cond, then_branch, else_branch) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 582

def emit_unless_output(cond, then_branch, else_branch)
  parse(cond)
  emit_literal(" ? ")
  if else_branch
    parse(else_branch)
  else
    emit_literal(nil)
  end
  emit_literal(" : ")
  parse(then_branch)
end

#emit_when_clause_values(values) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 669

def emit_when_clause_values(values)
  if values.type != :LIST
    raise Papercraft::Error, "Expected LIST node, found #{values.type} node"
  end

  idx = 0
  list_items = values.children
  while idx < list_items.size
    value = list_items[idx]
    break if !value

    emit_code(', ') if idx > 0
    parse(value, idx > 0)
    idx += 1
  end
end

#encode(str, encoding) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 95

def encode(str, encoding)
  case encoding
  when :html
    __html_encode__(str)
  when :uri
    __uri_encode__(str)
  else
    raise "Invalid encoding #{encoding.inspect}"
  end
end

#fcall_attributes_from_args(args) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 289

def fcall_attributes_from_args(args)
  return nil if !args

  last = args.last
  (last.type == :HASH) ? last : nil
end

#fcall_inner_text_from_args(args) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 265

def fcall_inner_text_from_args(args)
  return nil if !args

  first = args.first
  case first.type
  when :STR
    first.children.first
  when :LIT, :SYM
    first.children.first.to_s
  when :HASH
    nil
  when :CONST
    const_name = first.children.first
    value = get_const(const_name)
    if value.is_a?(Papercraft::Template)
      value
    else
      value
    end
  else
    first
  end
end

#flush_emit_buffer ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 124

def flush_emit_buffer
  return if !@emit_buffer

  @code_buffer << "#{'  ' * @level}__buffer__ << \"#{@emit_buffer}\"\n"
  @emit_buffer = nil
  true
end

#get_const(name) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 85

def get_const(name)
  if @block.binding.eval("singleton_class.const_defined?(#{name.inspect})")
    @block.binding.eval("singleton_class.const_get(#{name.inspect})")
  elsif Papercraft.const_defined?(name)
    Papercraft.const_get(name)
  else
    raise NameError, "Constant #{name} not found"
  end
end

#parse(node, line_break = true) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 186

def parse(node, line_break = true)
  @line_break = line_break && @last_node && node.first_lineno != @last_node.first_lineno
  @last_node = node
  method_name = :"parse_#{node.type.downcase}"
  if !respond_to?(method_name)
    raise Papercraft::Error, "Template compiler doesn't know how to convert #{node.type.inspect} node"
  end
  send(method_name, node)
end

#parse_begin(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 548

def parse_begin(node)
  node.children.each { |c| parse(c) if c }
end

#parse_block(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 544

def parse_block(node)
  node.children.each { |c| parse(c) }
end

#parse_call(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 427

def parse_call(node)
  receiver, method, args = node.children
  if receiver.type == :VCALL && receiver.children == [:context]
    emit_literal('__ctx__')
  else
    parse(receiver)
  end
  if method == :[]
    emit_literal('[')
    args = args.children.compact
    while true
      arg = args.shift
      break unless arg

      parse(arg)
      emit_literal(', ') if !args.empty?
    end
    emit_literal(']')
  else
    emit_literal('.')
    emit_literal(method.to_s)
    if args
      emit_literal('(')
      args = args.children.compact
      while true
        arg = args.shift
        break unless arg

        parse(arg)
        emit_literal(', ') if !args.empty?
      end
      emit_literal(')')
    end
  end
end

#parse_case(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 634

def parse_case(node)
  value       = node.children[0]
  when_clause = node.children[1]
  emit_code("case ")
  parse(value)
  emit_code("\n")
  parse_when(when_clause)
  emit_code("end\n")
end

#parse_dvar(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 630

def parse_dvar(node)
  emit_literal(node.children.first.to_s)
end

#parse_false(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 487

def parse_false(node)
  emit_expression { emit_literal('true') }
end

#parse_fcall(node, block = nil) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 226

def parse_fcall(node, block = nil)
  tag, args = node.children
  args = args.children.compact if args

  case tag
  when :html5
    return emit_html5(node, block)
  when :emit
    return emit_emit(node.children[1], block)
  when :emit_yield
    return emit_emit_yield
  when :text
    return emit_text_fcall(args.first)
  end

  text = fcall_inner_text_from_args(args)
  atts = fcall_attributes_from_args(args)
  if block
    emit_tag(tag, atts) { parse(block) }
  elsif text
    emit_tag(tag, atts) do
      case text
      when Papercraft::Template
        @sub_templates << text
        idx = @sub_templates.size - 1
        emit_code("__sub_templates__[#{idx}].(__buffer__)\n")
      when String
        emit_output { emit_text(text) }
      when RubyVM::AbstractSyntaxTree::Node
        emit_output { emit_expression { parse(text) } }
      else
        emit_text(text.to_s)
      end
    end
  else
    emit_tag(tag, atts)
  end
end

#parse_hash(node, emit_container = false) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 508

def parse_hash(node, emit_container = false)
  emit_literal('{') if emit_container
  items = node.children.first.children
  idx = 0
  while idx < items.size
    k = items[idx]
    break if !k

    v = items[idx + 1]
    p k: k, v: v
    emit_literal(', ') if idx > 0
    idx += 2

    parse(k)
    emit_literal(' => ')
    parse(v)
  end
  emit_literal('}') if emit_container
end

#parse_if(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 552

def parse_if(node)
  cond, then_branch, else_branch = node.children
  if @output_mode
    emit_if_output(cond, then_branch, else_branch)
  else
    emit_if_code(cond, then_branch, else_branch)
  end
end

#parse_integer(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 478

def parse_integer(node)
  value = node.children.first
  emit_literal(value.inspect)
end

#parse_iter(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 204

def parse_iter(node)
  call, scope = node.children
  if call.type == :FCALL
    parse_fcall(call, scope)
  else
    parse(call)
    emit_code(" do")
    args = scope.children[0]
    emit_code(" |#{args.join(', ')}|") if args
    emit_code("\n")
    @level += 1
    parse(scope)
    flush_emit_buffer
    @level -= 1
    emit_code("end\n")
  end
end

#parse_ivar(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 222

def parse_ivar(node)
  emit_literal(node.children.first.to_s)
end

#parse_list(node, emit_container = true, range = nil) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 491

def parse_list(node, emit_container = true, range = nil)
  emit_literal('[') if emit_container
  if range
    items = node.children[range].compact
  else
    items = node.children.compact
  end
  while true
    item = items.shift
    break unless item

    parse(item, emit_container)
    emit_literal(', ') if !items.empty?
  end
  emit_literal(']') if emit_container
end

#parse_lit(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 468

def parse_lit(node)
  value = node.children.first
  emit_literal(value.inspect)
end

#parse_opcall(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 537

def parse_opcall(node)
  left, op, right = node.children
  parse(left)
  emit_literal(" #{op} ")
  right.children.compact.each { |c| parse(c) }
end

#parse_scope(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 196

def parse_scope(node)
  args = node.children[0]
  if args && !args.empty?
    @args = args.compact
  end
  parse(node.children[2])
end

#parse_str(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 463

def parse_str(node)
  str = node.children.first
  emit_literal(str.inspect)
end

#parse_sym(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 473

def parse_sym(node)
  value = node.children.first
  emit_literal(value.inspect)
end

#parse_true(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 483

def parse_true(node)
  emit_expression { emit_literal('true') }
end

#parse_unless(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 561

def parse_unless(node)
  cond, then_branch, else_branch = node.children
  if @output_mode
    emit_unless_output(cond, then_branch, else_branch)
  else
    emit_unless_code(cond, then_branch, else_branch)
  end
end

#parse_vcall(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 528

def parse_vcall(node)
  tag = node.children.first
  case tag
  when :emit_yield
    return emit_emit_yield
  end
  emit_tag(tag, nil)
end

#parse_when(node) ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 644

def parse_when(node)
  values      = node.children[0]
  then_clause = node.children[1]
  else_clause = node.children[2]

  emit_code('when ')
  last_value = nil
  emit_when_clause_values(values)
  emit_code("\n")
  @level += 1
  parse(then_clause)
  @level -= 1
  
  return if !else_clause

  if else_clause.type == :WHEN
    parse_when(else_clause)
  else
    emit_code("else\n")
    @level += 1
    @level -= 1
    parse(else_clause)
  end
end

#prelude ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 171

def prelude
  return nil if @sub_templates.empty?

  converted = @sub_templates.map { |t| convert_sub_template(t)}
  "#{'  ' * @level}  __sub_templates__ = [\n#{converted.join(",\n")}\n  ]\n"
end

#proc_args ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 164

def proc_args
  return nil if !@args
  
  # ", #{@args.map { "#{_1}:" }.join(", ")}"
  ", #{@args.join(", ")}"
end

#to_code ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 159

def to_code
  pad = '  ' * @level
  "#{pad}->(__buffer__#{proc_args}, &__block__) do\n#{prelude}#{@code_buffer}#{pad}  __buffer__\n#{pad}end"
end

#to_proc ⇒ Object 



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# File 'lib/papercraft/compiler_old.rb', line 182

def to_proc
  @block.binding.eval(to_code)
end