68 lines
1.6 KiB
Ruby
68 lines
1.6 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
class Webhooks::PayloadRenderer
|
|
class DocumentTraverser
|
|
INT_REGEX = /[0-9]+/
|
|
|
|
def initialize(document)
|
|
@document = document.with_indifferent_access
|
|
end
|
|
|
|
def get(path)
|
|
value = @document.dig(*parse_path(path))
|
|
string = Oj.dump(value)
|
|
|
|
# We want to make sure people can use the variable inside
|
|
# other strings, so it can't be wrapped in quotes.
|
|
if value.is_a?(String)
|
|
string[1...-1]
|
|
else
|
|
string
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def parse_path(path)
|
|
path.split('.').filter_map do |segment|
|
|
if segment.match(INT_REGEX)
|
|
segment.to_i
|
|
else
|
|
segment.presence
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
class TemplateParser < Parslet::Parser
|
|
rule(:dot) { str('.') }
|
|
rule(:digit) { match('[0-9]') }
|
|
rule(:property_name) { match('[a-z_]').repeat(1) }
|
|
rule(:array_index) { digit.repeat(1) }
|
|
rule(:segment) { (property_name | array_index) }
|
|
rule(:path) { property_name >> (dot >> segment).repeat }
|
|
rule(:variable) { (str('}}').absent? >> path).repeat.as(:variable) }
|
|
rule(:expression) { str('{{') >> variable >> str('}}') }
|
|
rule(:text) { (str('{{').absent? >> any).repeat(1) }
|
|
rule(:text_with_expressions) { (text.as(:text) | expression).repeat.as(:text) }
|
|
root(:text_with_expressions)
|
|
end
|
|
|
|
EXPRESSION_REGEXP = /
|
|
\{\{
|
|
[a-z_]+
|
|
(\.
|
|
([a-z_]+|[0-9]+)
|
|
)*
|
|
\}\}
|
|
/iox
|
|
|
|
def initialize(json)
|
|
@document = DocumentTraverser.new(Oj.load(json))
|
|
end
|
|
|
|
def render(template)
|
|
template.gsub(EXPRESSION_REGEXP) { |match| @document.get(match[2...-2]) }
|
|
end
|
|
end
|