Class: Take::Unit::Scanner

Inherits:
Object
  • Object
show all
Defined in:
lib/take/unit/scanner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Scanner

Returns a new instance of Scanner.



9
10
11
12
 
# File 'lib/take/unit/scanner.rb', line 9

def initialize(input)
  @input = "\n" << input
  @scanner = StringScanner.new(input)
end

Instance Attribute Details

#tokens ⇒ Object (readonly)

Returns the value of attribute tokens.



7
8
9
 
# File 'lib/take/unit/scanner.rb', line 7

def tokens
  @tokens
end

Instance Method Details

#scan ⇒ Object 



14
15
16
17
18
19
20
21
22
 
# File 'lib/take/unit/scanner.rb', line 14

def scan
  @tokens ||= begin
    @tokens = []
    until @scanner.eos?
      scan_group_body { error! }
    end
    @tokens
  end
end

#scan_body ⇒ Object 



64
65
66
67
68
 
# File 'lib/take/unit/scanner.rb', line 64

def scan_body
  if @scanner.check(/\s*\{/)
    emit :block, _scan_block
  end
end

#scan_group(scan = /macro|test|before|after|prefix/) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/take/unit/scanner.rb', line 50

def scan_group(scan = /macro|test|before|after|prefix/)
  if @scanner.scan(scan)
    group_type = @scanner[0]
    @scanner.scan(/ ([A-Za-z0-9_.-]+)\(/) or error!
    group_name = @scanner[1]

    @scanner.scan(/\s*\;/)

    emit group_type.intern,
         group_name,
         _scan_arguments(/\s*\)/, /,\s+/)
  end
end

#scan_group_body ⇒ Object 



24
25
26
27
28
29
30
31
 
# File 'lib/take/unit/scanner.rb', line 24

def scan_group_body
  pre_scan
  scan_nested or
  scan_group or
  scan_body or
  scan_whitespace or
  yield
end

#scan_nested ⇒ Object 



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/take/unit/scanner.rb', line 33

def scan_nested
  if scan_group(/group/)
    scan_whitespace
    @scanner.scan(/\{/) or error!
    loop do
      scan_group_body do
        if @scanner.scan(/\}/)
          pre_scan
          return emit(:group_end)
        else
          error!
        end
      end
    end
  end
end

#scan_whitespace(newlines = true) ⇒ Object 



70
71
72
73
74
75
76
 
# File 'lib/take/unit/scanner.rb', line 70

def scan_whitespace(newlines = true)
  if newlines
    @scanner.scan(/\s+/)
  else
    @scanner.scan(/[ \t]+/)
  end
end