Class: ComponentEmbeddedRuby::Parser::TagParser

Inherits:
Base
  • Object
show all
Defined in:
lib/component_embedded_ruby/parser/tag_parser.rb

Overview

Internal: Parses an HTML tag into a Node object

This class is responsible for parsing an HTML element into a node instance. There are three variations of tags:

  • A self-closing tag e.g. <hr/>

  • A tag with no children <img src=“/favicon.png”></img>

  • A tag with children e.g. bold text!

A tag with children will delegate back to the ‘RootParser` since child elements can be any combination of adjacent tags, strings, and ruby code.

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from ComponentEmbeddedRuby::Parser::Base

Instance Method Details

#call ⇒ Object 



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# File 'lib/component_embedded_ruby/parser/tag_parser.rb', line 18

def call
  # Expect opening carrot, e.g. < in <h1>
  expect(:open_carrot)

  # Expects an identifier, e.g. "h1"
  tag = expect(:identifier).value

  # Expects 0 or more attributes
  # e.g. id="hello" in <h1 id="hello">
  attributes = AttributeParser.new(token_reader).call

  # Is this a self-closing element?
  if current_token.type == :slash
    expect(:slash)
    expect(:close_carrot)

    Node.new(tag, attributes, [])
  else
    expect(:close_carrot)

    children = parse_children

    expect(:open_carrot)
    expect(:slash)
    close_tag = expect(:identifier).value

    raise "Mismatched tags. expected #{tag}, got #{current_token.value}" if close_tag != tag

    expect(:close_carrot)

    Node.new(tag, attributes, children)
  end
end