Module: Pray::Substitute

Defined in:
lib/pray/substitute.rb

Constant Summary collapse

PLACEHOLDER_PREFIX = 
"((pray:"
PLACEHOLDER_SUFFIX = 
"))"

Class Method Summary collapse

Class Method Details

.pray_symbol_key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


10
11
12
13
14
 
# File 'lib/pray/substitute.rb', line 10

def pray_symbol_key?(key)
  return false if key.nil? || key.empty?

  key.match?(/\A[A-Za-z0-9._\/-]+\z/)
end

.substitute_pray_symbols(text, symbols) ⇒ Object 



16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/pray/substitute.rb', line 16

def substitute_pray_symbols(text, symbols)
  lookup = symbols.is_a?(Hash) ? symbols : symbols.to_h
  output = +""
  rest = text

  loop do
    start = rest.index(PLACEHOLDER_PREFIX)
    unless start
      output << rest
      return output
    end

    output << rest[0...start]
    after_prefix = rest[(start + PLACEHOLDER_PREFIX.length)..]
    end_index = after_prefix.index(PLACEHOLDER_SUFFIX)
    raise Error.render("unclosed ((pray:...) placeholder") unless end_index

    path = after_prefix[0...end_index]
    unless pray_symbol_key?(path)
      raise Error.render("invalid ((pray:...)) path `#{path}`")
    end

    value = lookup[path]
    unless value
      raise Error.render(
        "unknown pray symbol `#{path}`; declare it in `pray do ... end`"
      )
    end

    output << value
    rest = after_prefix[(end_index + PLACEHOLDER_SUFFIX.length)..]
  end
end