Class: Semlogr::Templates::Parser
- Inherits:
-
Object
- Object
- Semlogr::Templates::Parser
- Defined in:
- lib/semlogr/templates/parser.rb
Constant Summary collapse
- PROPERTY_TOKEN_START =
'{'
- PROPERTY_TOKEN_END =
'}'
- FILTER_TOKEN_START =
':'
Class Method Summary collapse
- .parse(template) ⇒ Object
- .parse_property_token(template, start) ⇒ Object
- .parse_text_token(template, start) ⇒ Object
Class Method Details
.parse(template) ⇒ Object
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# File 'lib/semlogr/templates/parser.rb', line 17 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 55 def self.parse_property_token(template, start) return [nil, start] unless template[start] == PROPERTY_TOKEN_START token = nil pos = start filter_start = nil while pos < template.size case template[pos] when PROPERTY_TOKEN_END raw_text = template[start..pos] filter = nil if filter_start.nil? property_name = template[start + 1..pos - 1] else property_name = template[start + 1..filter_start - 1] filter = template[filter_start + 1..pos - 1] end token = PropertyToken.new(raw_text, property_name.to_sym, filter) return [token, pos + 1] when FILTER_TOKEN_START filter_start ||= pos 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 37 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 |