Class: FuzzBert::Template::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/fuzzbert/template.rb

Instance Method Summary collapse

Constructor Details

#initialize(template) ⇒ Parser

Returns a new instance of Parser.



25
26
27
28
 
# File 'lib/fuzzbert/template.rb', line 25

def initialize(template)
  @io = StringIO.new(template)
  @template = []
end

Instance Method Details

#determine_state ⇒ Object 



49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/fuzzbert/template.rb', line 49

def determine_state
  begin
    @buf = @io.readchar

    case @buf
    when '$'
      c = @io.readchar
      if c == "{"
        @buf = ""
        :IDENTIFIER
      else
        @buf << c
        :TEXT
      end
    when '\\'
      @buf = ""
      :TEXT
    else
      :TEXT
    end
  rescue EOFError
    :EOF
  end
end

#parse ⇒ Object 



30
31
32
33
34
35
36
 
# File 'lib/fuzzbert/template.rb', line 30

def parse
  @state = determine_state 
  while token = parse_token
    @template << token
  end
  @template
end

#parse_escape ⇒ Object 



119
120
121
122
123
124
125
 
# File 'lib/fuzzbert/template.rb', line 119

def parse_escape
  begin
    @io.readchar
  rescue EOFError
    '\\'
  end
end

#parse_identifier ⇒ Object 



74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/fuzzbert/template.rb', line 74

def parse_identifier
  name = ""
  begin
    until (c = @io.readchar) == '}'
      name << c
    end

    if name.empty?
      raise RuntimeError.new("No identifier name given")
    end

    @state = determine_state
    Identifier.new(name)
  rescue EOFError
    raise RuntimeError.new("Unclosed identifier")
  end
end

#parse_text ⇒ Object 



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
 
# File 'lib/fuzzbert/template.rb', line 92

def parse_text
  text = @buf
  begin
    loop do
      until (c = @io.readchar) == '$'
        if c == '\\'
          text << parse_escape
        else
          text << c
        end
      end

      d = @io.readchar
      if d == "{"
        @state = :IDENTIFIER
        return Text.new(text)
      else
        text << c
        text << d
      end
    end
  rescue EOFError
    @state = :EOF
    Text.new(text)
  end
end

#parse_token ⇒ Object 



38
39
40
41
42
43
44
45
46
47
 
# File 'lib/fuzzbert/template.rb', line 38

def parse_token
  case @state
  when :TEXT
    parse_text
  when :IDENTIFIER
    parse_identifier
  else
    nil
  end
end