# -*- coding: utf-8 -*- #
# frozen_string_literal: true

module Rouge
  module Lexers
    class HTML < RegexLexer
      title "HTML"
      desc "HTML, the markup language of the web"
      tag 'html'
      filenames '*.htm', '*.html', '*.xhtml'
      mimetypes 'text/html', 'application/xhtml+xml'

      def self.detect?(text)
        return true if text.doctype?(/\bhtml\b/i)
        return true if text =~ /<\s*html\b/
      end

      start do
        @javascript = Javascript.new(options)
        @css = CSS.new(options)
      end

      state :root do
        rule /[^<&]+/m, Text
        rule /&\S*?;/, Name::Entity
        rule /<!DOCTYPE .*?>/im, Comment::Preproc
        rule /<!\[CDATA\[.*?\]\]>/m, Comment::Preproc
        rule /<!--/, Comment, :comment
        rule /<\?.*?\?>/m, Comment::Preproc # php? really?

        rule /<\s*script\s*/m do
          token Name::Tag
          @javascript.reset!
          push :script_content
          push :tag
        end

        rule /<\s*style\s*/m do
          token Name::Tag
          @css.reset!
          @lang = @css
          push :style_content
          push :tag
        end

        rule /<\//, Name::Tag, :tag_end
        rule /</, Name::Tag, :tag_start

        rule %r(<\s*[a-zA-Z0-9:-]+), Name::Tag, :tag # opening tags
        rule %r(<\s*/\s*[a-zA-Z0-9:-]+\s*>), Name::Tag # closing tags
      end

      state :tag_end do
        mixin :tag_end_end
        rule /[a-zA-Z0-9:-]+/ do
          token Name::Tag
          goto :tag_end_end
        end
      end

      state :tag_end_end do
        rule /\s+/, Text
        rule />/, Name::Tag, :pop!
      end

      state :tag_start do
        rule /\s+/, Text

        rule /[a-zA-Z0-9:-]+/ do
          token Name::Tag
          goto :tag
        end

        rule(//) { goto :tag }
      end

      state :comment do
        rule /[^-]+/, Comment
        rule /-->/, Comment, :pop!
        rule /-/, Comment
      end

      state :tag do
        rule /\s+/m, Text
        rule /[a-zA-Z0-9_:-]+\s*=\s*/m, Name::Attribute, :attr
        rule /[a-zA-Z0-9_:-]+/, Name::Attribute
        rule %r(/?\s*>)m, Name::Tag, :pop!
      end

      state :attr do
        # TODO: are backslash escapes valid here?
        rule /"/ do
          token Str
          goto :dq
        end

        rule /'/ do
          token Str
          goto :sq
        end

        rule /[^\s>]+/, Str, :pop!
      end

      state :dq do
        rule /"/, Str, :pop!
        rule /[^"]+/, Str
      end

      state :sq do
        rule /'/, Str, :pop!
        rule /[^']+/, Str
      end

      state :script_content do
        rule %r([^<]+) do
          delegate @javascript
        end

        rule %r(<\s*/\s*script\s*>)m, Name::Tag, :pop!

        rule %r(<) do
          delegate @javascript
        end
      end

      state :style_content do
        rule /[^<]+/ do
          delegate @lang
        end

        rule %r(<\s*/\s*style\s*>)m, Name::Tag, :pop!

        rule /</ do
          delegate @lang
        end
      end
    end
  end
end
