Class: Parby::Parser

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

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Parser

{ |input, index| } -> result or { |input| } -> result

Raises:

  • (ArgumentError) 


4
5
6
7
8
 
# File 'lib/parby/parser.rb', line 4

def initialize(&block)
  raise(ArgumentError, 'A bare parser must be initialized with a 1 or 2 argument block') unless block_given?

  @block = block
end

Instance Method Details

#>>(other) ⇒ Object 



46
47
48
 
# File 'lib/parby/parser.rb', line 46

def >>(other)
  self.and other
end

#and(another_parser) ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
 
# File 'lib/parby/parser.rb', line 34

def and(another_parser)
  Parser.new do |input, index|
    first = parse(input, index)

    if first.failed?
      first
    else
      another_parser.parse(first.remaining, first.index)
    end
  end
end

#consuming ⇒ Object 



66
67
68
 
# File 'lib/parby/parser.rb', line 66

def consuming
  self >> Parby.all
end

#fmap(&block) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/parby/parser.rb', line 50

def fmap(&block)
  Parser.new do |input, index|
    result = parse(input, index)

    if result.succeed?
      result.value = yield(result.value)
    end

    result
  end
end

#map(&block) ⇒ Object 



62
63
64
 
# File 'lib/parby/parser.rb', line 62

def map(&block)
  fmap(&block)
end

#or(another_parser) ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
 
# File 'lib/parby/parser.rb', line 18

def or(another_parser)
  Parser.new do |input, index|
    first = parse(input, index)

    if first.failed?
      another_parser.parse(input, index)
    else
      first
    end
  end
end

#parse(*args) ⇒ Object 



10
11
12
13
14
15
16
 
# File 'lib/parby/parser.rb', line 10

def parse(*args)
  if args.length == 1
    @block.call(args[0], 0)
  else
    @block.call(args[0], args[1])
  end
end

#|(other) ⇒ Object 



30
31
32
 
# File 'lib/parby/parser.rb', line 30

def |(other)
  self.or other
end