Module: POECSS::Preprocessor

Defined in:
lib/poe-css/preprocessor.rb

Defined Under Namespace

Classes: ArgumentList, ConstantDefinition, DefinitionParser, DefinitionTransformer, MacroDefinition, UsageParser

Constant Summary collapse

IDENTIFIER_CHAR_REGEX = 
'[0-9a-zA-Z\-_]'

Class Method Summary collapse

Class Method Details

.compile(input) ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
 
# File 'lib/poe-css/preprocessor.rb', line 61

def compile(input)
  stripped_input = input.strip
  return '' if stripped_input.empty?

  r = parse_definition(stripped_input)
  tree = DefinitionTransformer.new.apply(r)

  constants = tree.select { |n| n.is_a?(ConstantDefinition) }
  macros = tree.select { |n| n.is_a?(MacroDefinition) }
  strings = tree.select { |n| n.is_a?(String) }

  constants_by_id =
    begin
      grouping = constants.group_by(&:identifier)
      if (id, = grouping.find { |_, defs| defs.length > 1 })
        raise ArgumentError, "Multiple definitions of #{id} found."
      end

      grouping.transform_values(&:first).to_h
    end

  macros_by_id =
    begin
      grouping = macros.group_by(&:identifier)
      if (id, = grouping.find { |_, defs| defs.length > 1 })
        raise ArgumentError, "Multiple definitions of #{id} found."
      end

      grouping.transform_values(&:first).to_h
    end

  interpolate_macros(constants_by_id, macros_by_id, strings.join(''))
end