Module: RText::Tokenizer

Included in:
ContextBuilder, Instantiator, LinkDetector
Defined in:
lib/rtext/tokenizer.rb

Defined Under Namespace

Classes: Token

Instance Method Summary collapse

Instance Method Details

#tokenize(str, reference_regexp, options = {}) ⇒ Object 



10
11
12
13
14
15
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
49
50
51
52
53
54
55
56
57
58
59
60
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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
 
# File 'lib/rtext/tokenizer.rb', line 10

def tokenize(str, reference_regexp, options={})
  result = []
  on_command_token_proc = options[:on_command_token]
  linebreak = false
  str.split(/\r?\n/).each_with_index do |str, idx|
    idx += 1
    if idx == 1
      # remove UTF-8 BOM if present
      enc = str.encoding
      str.force_encoding("binary")
      str = str[3..-1] if str.index("\xEF\xBB\xBF".force_encoding("binary")) == 0
      str.force_encoding(enc)
    end
    if str =~ /^\s*([\#@])(.*)/
      if $1 == "#"
        result << Token.new(:comment, $2, idx, str.size-$2.size, str.size) 
      else
        result << Token.new(:annotation, $2, idx, str.size-$2.size, str.size) 
      end
    else
      col = 1
      if linebreak
        # do not regard as the first token, if previous line ended in a linebreak
        linebreak = false
      else
        first_token_in_line = true
      end
      until str.empty?
        whitespace = false
        case str
        when reference_regexp
          str = $'
          result << Token.new(:reference, $&, idx, col, col+$&.size-1)
          col += $&.size
        when /\A[-+]?\d+\.\d+(?:e[+-]\d+)?\b/
          str = $'
          val = $&
          # if string size isn't more than 16, Float precision will be sufficient
          # otherwise use BigDecimal even though the value might still fit in a Float
          if val.size <= 16
            val = val.to_f
          else
            val = BigDecimal.new(val)
          end
          result << Token.new(:float, val, idx, col, col+$&.size-1)
          col += $&.size
        when /\A0[xX][0-9a-fA-F]+\b/
          str = $'
          result << Token.new(:integer, $&.to_i(16), idx, col, col+$&.size-1)
          col += $&.size
        when /\A[-+]?\d+\b/
          str = $'
          result << Token.new(:integer, $&.to_i, idx, col, col+$&.size-1)
          col += $&.size
        when /\A"((?:[^"\\]|\\.)*)"/
          str = $'
          match = $&
          result << Token.new(:string, $1.
            gsub('\\\\','\\').
            gsub('\\"','"').
            gsub('\\n',"\n").
            gsub('\\r',"\r").
            gsub('\\t',"\t").
            gsub('\\f',"\f").
            gsub('\\b',"\b"), idx, col, col+match.size-1)
          col += match.size
        when /\A(?:true|false)\b/
          str = $'
          result << Token.new(:boolean, $& == "true", idx, col, col+$&.size-1)
          col += $&.size
        when /\A([a-zA-Z_]\w*)\b:?/
          str = $'
          if $&[-1] == ?: 
            result << Token.new(:label, $1, idx, col, col+$&.size-1)
          else
            result << Token.new(:identifier, $&, idx, col, col+$&.size-1)
            if first_token_in_line && on_command_token_proc
              on_command_token_proc.call
            end
          end
          col += $&.size
        when /\A[\{\}\[\]:,]/
          str = $'
          result << Token.new($&, nil, idx, col, col+$&.size-1)
          col += $&.size
        when /\A#(.*)/
          str = ""
          result << Token.new(:comment, $1, idx, col, col+$&.size-1)
        when /\A\s+/
          str = $'
          col += $&.size
          whitespace = true
          # ignore
        when /\A\\\s*\Z/
          str = $'
          linebreak = true
          # ignore
        when /\A<%((?:(?!%>).)*)%>/, /\A<([^>]*)>/
          str = $'
          result << Token.new(:generic, RText::Generic.new($1), idx, col, col+$&.size-1)
          col += $&.size
        when /\A\S/
          str = $'
          result << Token.new(:error, $&, idx, col, col+$&.size-1)
          col += $&.size
        end
        first_token_in_line = false unless whitespace
      end
    end
    result << Token.new(:newline, nil, idx) \
      unless linebreak || result.empty? || result.last.kind == :newline
  end
  result
end