Class: Semlogr::Templates::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/semlogr/templates/parser.rb

Constant Summary collapse

PROPERTY_TOKEN_START = 
'{'.freeze
PROPERTY_TOKEN_END = 
'}'.freeze

Class Method Summary collapse

Class Method Details

.parse(template) ⇒ Object 



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# File 'lib/semlogr/templates/parser.rb', line 14

def self.parse(template)
  return Template::EMPTY unless template && !template.empty?

  cached_template = @template_cache[template]
  return cached_template if cached_template

  tokens = []
  pos = 0

  while pos < template.size
    text_token, pos = parse_text_token(template, pos)
    tokens.push(text_token) if text_token

    property_token, pos = parse_property_token(template, pos)
    tokens.push(property_token) if property_token
  end

  @template_cache[template] = Template.new(template, tokens)
end

.parse_property_token(template, start) ⇒ Object 



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# File 'lib/semlogr/templates/parser.rb', line 52

def self.parse_property_token(template, start)
  return [nil, start] unless template[start] == PROPERTY_TOKEN_START

  token = nil
  pos = start

  while pos < template.size
    if template[pos] == PROPERTY_TOKEN_END
      raw_text = template[start..pos]
      property_name = raw_text[1..-2]
      token = PropertyToken.new(raw_text, property_name.to_sym)

      return [token, pos + 1]
    end

    pos += 1
  end

  if pos > start
    text = template[start..pos - 1]
    token = TextToken.new(text)
  end

  [token, pos]
end

.parse_text_token(template, start) ⇒ Object 



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# File 'lib/semlogr/templates/parser.rb', line 34

def self.parse_text_token(template, start)
  token = nil
  pos = start

  while pos < template.size
    break if template[pos] == PROPERTY_TOKEN_START

    pos += 1
  end

  if pos > start
    text = template[start..pos - 1]
    token = TextToken.new(text)
  end

  [token, pos]
end