Class: Ruby2html::Render

Inherits:
Object
  • Object
show all
Defined in:
lib/gem/ruby2html/render.rb,
ext/ruby2html/ruby2html.c

Constant Summary collapse

HTML5_TAGS = 
%w[
  a abbr address area article aside audio b base bdi bdo blockquote body br button canvas caption
  cite code col colgroup data datalist dd del details dfn dialog div dl dt em embed fieldset
  figcaption figure footer form h1 h2 h3 h4 h5 h6 head header hr html i iframe img input ins
  kbd label legend li link main map mark meta meter nav noscript object ol optgroup option
  output p param picture pre progress q rp rt ruby s samp script section select small source
  span strong style sub summary sup table tbody td template textarea tfoot th thead time title
  tr track u ul var video wbr turbo-frame turbo-stream
].freeze
VOID_ELEMENTS = 
%w[area base br col embed hr img input link meta param source track wbr].freeze
COMMON_RAILS_METHOD_HELPERS = 
%w[link_to image_tag form_with button_to].freeze
METHOD_DEFINITIONS =

Pre-generate all HTML tag methods as a single string

HTML5_TAGS.map do |tag|
  method_name = tag.tr('-', '_')
  is_void = VOID_ELEMENTS.include?(tag)
  <<-RUBY
    def #{method_name}(*args, **options, &block)
      content = args.first.is_a?(String) ? args.shift : nil
      estimated_size = #{tag.length * 2 + 5}
      estimated_size += 32 if options.any?
      estimated_size += content.length if content
      tag_content = String.new(capacity: estimated_size)
      tag_content << '<#{tag}'
      fast_buffer_append(tag_content, fast_attributes_to_s(options))
      #{if is_void
          'tag_content << \' />\''
        else
          <<-TAG_LOGIC
            tag_content << '>'
            if block
              prev_output = @current_output
              nested_content = String.new(capacity: 1024)
              @current_output = nested_content
              block_result = block.call
              @current_output = prev_output
              if block_result.is_a?(String)
                fast_buffer_append(tag_content, fast_escape_html(block_result))
              else
                fast_buffer_append(tag_content, nested_content)
              end
            elsif content
              fast_buffer_append(tag_content, fast_escape_html(content))
            end
            tag_content << '</#{tag}>'
          TAG_LOGIC
        end}
      fast_buffer_append(@current_output, tag_content)
    end
  RUBY
end.join("\n")

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(context = nil, &root) ⇒ Render 



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# File 'lib/gem/ruby2html/render.rb', line 70

def initialize(context = nil, &root)
  @context = context
  @root = root
  @output = String.new(capacity: 4096)
  @current_output = @output
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, **options, &block) ⇒ Object (private) 



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# File 'lib/gem/ruby2html/render.rb', line 120

def method_missing(method_name, *args, **options, &block)
  if @context.respond_to?(method_name)
    @context.send(method_name, *args, **options, &block)
  else
    super
  end
end

Instance Attribute Details

#current_output ⇒ Object

Returns the value of attribute current_output.



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# File 'lib/gem/ruby2html/render.rb', line 68

def current_output
  @current_output
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/gem/ruby2html/render.rb', line 67

def output
  @output
end

Instance Method Details

#__render_from_rails(template_path) ⇒ Object 



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# File 'lib/gem/ruby2html/render.rb', line 77

def __render_from_rails(template_path)
  result = render
  return result unless annotate_rendered_view_with_filenames?

  template_path = template_path.sub("#{Rails.root}/", '')
  comment_start = "<!-- BEGIN #{template_path} -->"
  comment_end = "<!-- END #{template_path} -->"

  final_result = String.new(capacity: result.length + comment_start.length + comment_end.length)
  final_result << comment_start
  final_result << result
  final_result << comment_end
  final_result.html_safe
end

#component(component_output) ⇒ Object 



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# File 'lib/gem/ruby2html/render.rb', line 115

def component(component_output)
  fast_buffer_append(@current_output, component_output)
end

#fast_attributes_to_s(hash) ⇒ Object

Fast attribute string builder



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# File 'ext/ruby2html/ruby2html.c', line 69

static VALUE fast_attributes_to_s(VALUE self, VALUE hash) {
    if (NIL_P(hash) || RHASH_EMPTY_P(hash)) return rb_str_new2("");

    VALUE result = rb_str_buf_new(64); // Pre-allocate with reasonable size
    VALUE keys = rb_funcall(hash, rb_intern("keys"), 0);
    long len = RARRAY_LEN(keys);

    for (long i = 0; i < len; i++) {
        VALUE key = rb_ary_entry(keys, i);
        VALUE value = rb_hash_aref(hash, key);

        if (!NIL_P(value)) {
            rb_str_cat2(result, " ");
            rb_str_append(result, rb_String(key));
            rb_str_cat2(result, "=\"");
            rb_str_append(result, fast_escape_html(self, rb_String(value)));
            rb_str_cat2(result, "\"");
        }
    }

    return result;
}

#fast_buffer_append(buffer, str) ⇒ Object

Fast string buffer concatenation



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# File 'ext/ruby2html/ruby2html.c', line 93

static VALUE fast_buffer_append(VALUE self, VALUE buffer, VALUE str) {
    if (!NIL_P(str)) {
        rb_funcall(buffer, rb_intern("<<"), 1, rb_String(str));
    }
    return Qnil;
}

#fast_escape_html(str) ⇒ Object

Fast HTML escaping



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# File 'ext/ruby2html/ruby2html.c', line 10

static VALUE fast_escape_html(VALUE self, VALUE str) {
    if (NIL_P(str)) return Qnil;

    str = rb_String(str);
    long len = RSTRING_LEN(str);
    const char *ptr = RSTRING_PTR(str);

    // First pass: calculate required buffer size
    long new_len = len;
    for (long i = 0; i < len; i++) {
        switch (ptr[i]) {
            case '&': new_len += 4; break; // &amp;
            case '<': new_len += 3; break; // &lt;
            case '>': new_len += 3; break; // &gt;
            case '"': new_len += 5; break; // &quot;
            case '\'': new_len += 5; break; // &#39;
        }
    }

    if (new_len == len) return str;

    VALUE result = rb_str_new(NULL, new_len);
    char *out = RSTRING_PTR(result);
    long pos = 0;

    // Second pass: actual escaping
    for (long i = 0; i < len; i++) {
        switch (ptr[i]) {
            case '&':
                memcpy(out + pos, "&amp;", 5);
                pos += 5;
                break;
            case '<':
                memcpy(out + pos, "&lt;", 4);
                pos += 4;
                break;
            case '>':
                memcpy(out + pos, "&gt;", 4);
                pos += 4;
                break;
            case '"':
                memcpy(out + pos, "&quot;", 6);
                pos += 6;
                break;
            case '\'':
                memcpy(out + pos, "&#39;", 5);
                pos += 5;
                break;
            default:
                out[pos++] = ptr[i];
        }
    }

    rb_str_set_len(result, pos);
    rb_enc_associate(result, rb_enc_get(str));
    return result;
}

#plain(text) ⇒ Object 



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# File 'lib/gem/ruby2html/render.rb', line 107

def plain(text)
  if defined?(ActiveSupport) && (text.is_a?(ActiveSupport::SafeBuffer) || text.html_safe?)
    fast_buffer_append(@current_output, text)
  else
    fast_buffer_append(@current_output, fast_escape_html(text.to_s))
  end
end

#render(*args, **options, &block) ⇒ Object 



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# File 'lib/gem/ruby2html/render.rb', line 92

def render(*args, **options, &block)
  set_instance_variables

  return plain @context.render(*args, **options, &block) if !args.empty? || !options.empty? || block_given?

  instance_exec(&@root)
  result = @output
  result = ActiveSupport::SafeBuffer.new(result) if defined?(ActiveSupport)
  result
end

#respond_to?(method_name, include_private = false) ⇒ Boolean 



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# File 'lib/gem/ruby2html/render.rb', line 103

def respond_to?(method_name, include_private = false)
  HTML5_TAGS.include?(method_name.to_s.tr('_', '-')) || super
end