Class: FormatLine

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

Constant Summary collapse

SimpleFormats = 
{}
Null = 
""
Space = 
" "
Alpha = 
/[A-Za-z]/
AlNum = 
/[A-Za-z0-9_]/
LF = 
"\n"
LBrack = 
"["
Blank = 
[" ", nil, "\n"]
Punc = 
[")", ",", ".", " ", "\n"]
NoAlpha = 
/[^A-Za-z0-9_]/
NoAlphaDot = 
/[^.A-Za-z0-9_]/
Param = 
["]", "\n", nil]
Escape =

not an ESC char

"\\"
Syms = 
{ "*" => :b, "_" => :i, "`" => :t, "~" => :s }

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(line) ⇒ FormatLine

Returns a new instance of FormatLine.



35
36
37
38
39
40
 
# File 'lib/formatline.rb', line 35

def initialize(line)
  @line = line
  @i = -1
  @token = Null.dup
  @tokenlist = []
end

Instance Attribute Details

#out ⇒ Object (readonly)

Returns the value of attribute out.



32
33
34
 
# File 'lib/formatline.rb', line 32

def out
  @out
end

#tokenlist ⇒ Object (readonly)

Returns the value of attribute tokenlist.



33
34
35
 
# File 'lib/formatline.rb', line 33

def tokenlist
  @tokenlist
end

Class Method Details

.parse!(line) ⇒ Object 



42
43
44
45
46
47
 
# File 'lib/formatline.rb', line 42

def self.parse!(line)
  return nil if line.nil?
  x = self.new(line.chomp)
  t = x.tokenize(line)
  x.evaluate
end

.var_func_parse(str) ⇒ Object 



74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
 
# File 'lib/formatline.rb', line 74

def self.var_func_parse(str)
  return nil if str.nil?
  x = self.new(str.chomp)
  x.grab
  loop do 
    case x.curr
      when Escape; x.grab; x.add x.curr; x.grab
      when "$"
        x.dollar
      when LF, nil
        break
      else
        x.add x.curr
    end
    x.grab
  end
  x.add_token(:str)
  x.evaluate
end

Instance Method Details

#add(str) ⇒ Object 



190
191
192
 
# File 'lib/formatline.rb', line 190

def add(str)
  @token << str unless str.nil?
end

#add_token(kind, token = @token) ⇒ Object 



194
195
196
197
 
# File 'lib/formatline.rb', line 194

def add_token(kind, token = @token)
  @tokenlist << [kind, token] unless token.empty?
  @token = Null.dup
end

#collect!(sym, terminators, param = false) ⇒ Object 



312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
 
# File 'lib/formatline.rb', line 312

def collect!(sym, terminators, param=false)
  str = Null.dup   # next is not " ","*","["
  grab
  loop do
    if curr == Escape
      str << grab # ch = escaped char
      grab
      next
    end
    break if terminate?(terminators, curr)
    str << curr    # not a terminator
    grab
  end
  grab if param && curr == "]" # skip right bracket
  add str
end

#curr ⇒ Object 



132
133
134
 
# File 'lib/formatline.rb', line 132

def curr
  @line[@i]
end

#dollar ⇒ Object 



223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
 
# File 'lib/formatline.rb', line 223

def dollar
  grab
  case curr
    when LF;  add "$";  add_token :str
    when " "; add "$ "; add_token :str
    when nil; add "$";  add_token :str
    when "$"; double_dollar
#     when "."; dollar_dot
    when /[A-Za-z]/
     add_token :str
      var = curr + grab_alpha_dot
      add_token(:var, var)
  else 
    add "$" + curr
    add_token(:string)
  end
end

#double_dollar ⇒ Object 



241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
 
# File 'lib/formatline.rb', line 241

def double_dollar
  case next!
    when Space; add_token :string, "$$ "; grab; return
    when LF, nil; add "$$"; add_token :str
    when Alpha
      add_token(:str, @token)
      func = grab_alpha
      add_token(:func, func)
      case next!
        when ":"; param = grab_colon_param; add_token(:colon, param)
        when "["; param = grab_func_param; add_token(:brackets, param)
        else  # do nothing
      end
    else
      grab; add_token :str, "$$" + curr; return
  end
end

#double_marker(char) ⇒ Object 



289
290
291
292
293
294
295
296
297
298
299
300
301
302
 
# File 'lib/formatline.rb', line 289

def double_marker(char)
  sym = Syms[char]
  grab
  kind = sym   # "string_#{char}".to_sym
  case next!   # first char after **
    when Space, LF, nil
      pre, post = SimpleFormats[sym]
      add_token kind
    else
      str = collect!(sym, Punc)
      grab unless next!.nil?
      add_token kind, str
  end
end

#embed(sym, str) ⇒ Object 



94
95
96
97
 
# File 'lib/formatline.rb', line 94

def embed(sym, str)
  pre, post = SimpleFormats[sym]
  pre + str + post
end

#embedded? ⇒ Boolean

Returns:

  • (Boolean) 


356
357
358
 
# File 'lib/formatline.rb', line 356

def embedded?
  ! (['"', "'", " ", nil].include? prev)
end

#evaluate(tokens = @tokenlist) ⇒ Object 



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
124
125
126
127
128
129
130
 
# File 'lib/formatline.rb', line 99

def evaluate(tokens = @tokenlist)
  @out = ""
  return "" if tokens.empty?
  gen = tokens.each
  token = gen.next
  loop do 
    break if token.nil? 
    sym, val = *token
    case sym
      when :str
        @out << val unless val == "\n"   # BUG
      when :var
        @out << varsub(val)
      when :func 
        param = nil
        arg = gen.peek
        if [:colon, :brackets].include? arg[0] 
          arg = gen.next  # for real
          param = arg[1]
          param = FormatLine.var_func_parse(param)
        end
        @out << funcall(val, param)
      when :b, :i, :t, :s
        val = FormatLine.var_func_parse(val)
        @out << embed(sym, val)
    else
      add_token :str
    end
    token = gen.next
  end
  @out
end

#funcall(name, param) ⇒ Object

From FormatLine:



333
334
335
336
337
338
339
340
341
342
 
# File 'lib/formatline.rb', line 333

def funcall(name, param)
  result = 
    if self.respond_to?("func_" + name.to_s)
      self.send("func_" + name.to_s, param)
    else
      fobj = ::Livetext::Functions.new
      fobj.send(name, param)
    end
  result
end

#grab ⇒ Object 



144
145
146
 
# File 'lib/formatline.rb', line 144

def grab
  @line[@i+=1]
end

#grab_alpha ⇒ Object 



199
200
201
202
203
204
205
206
207
208
209
 
# File 'lib/formatline.rb', line 199

def grab_alpha
  str = Null.dup
  grab
  loop do
    break if curr.nil?
    str << curr
    break if terminate?(NoAlpha, next!)
    grab
  end
  str
end

#grab_alpha_dot ⇒ Object 



211
212
213
214
215
216
217
218
219
220
221
 
# File 'lib/formatline.rb', line 211

def grab_alpha_dot
  str = Null.dup
  grab
  loop do
    break if curr.nil?
    str << curr
    break if terminate?(NoAlphaDot, next!)
    grab
  end
  str
end

#grab_colon_param ⇒ Object 



148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
 
# File 'lib/formatline.rb', line 148

def grab_colon_param
  grab  # grab :
  param = ""
  loop do 
    case next!
      when Escape
        grab
        param << next!
        grab
      when Space, LF, nil; break
    else
      param << next!
      grab
    end
  end

  param = nil if param.empty?
  param
end

#grab_func_param ⇒ Object 



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
 
# File 'lib/formatline.rb', line 168

def grab_func_param
  grab # [
  param = ""
  loop do 
    case next!
      when Escape
        grab
        param << next!
        grab
      when "]", LF, nil; break
    else
      param << next!
      grab
    end
  end

  add curr
  grab
  param = nil if param.empty?
  param
end

#long_marker(char) ⇒ Object 



304
305
306
307
308
309
310
 
# File 'lib/formatline.rb', line 304

def long_marker(char)
  sym = Syms[char]
  # grab  # skip left bracket
  kind = sym  # "param_#{sym}".to_sym
  arg = collect!(sym, Param, true)
  add_token kind, arg
end

#marker(char) ⇒ Object

def dollar_dot

add_token :ddot, @line[@i..-1]

end



263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
 
# File 'lib/formatline.rb', line 263

def marker(char)
  add_token :str
  sym = Syms[char]
  if embedded?
#     add char    # ??? add_token "*", :string
    return 
  end
  grab
  case curr
    when Space
      add char + " "
      add_token :str
      grab
    when LF, nil
      add char
      add_token :str
    when char;   double_marker(char)
    when LBrack; long_marker(char)
  else
    add curr
    str = collect!(sym, Blank)
    add_token sym, str
    add curr  # next char onto next token... 
  end
end

#next! ⇒ Object 



140
141
142
 
# File 'lib/formatline.rb', line 140

def next!
  @line[@i+1]
end

#prev ⇒ Object 



136
137
138
 
# File 'lib/formatline.rb', line 136

def prev
  @line[@i-1]
end

#showme(tag) ⇒ Object 



351
352
353
354
 
# File 'lib/formatline.rb', line 351

def showme(tag)
  char = @line[@cc]
  puts "--- #{tag}: ch=#{@ch.inspect} next=#{@next.inspect} (cc=#@cc:#{char.inspect})   out=#{@out.inspect}"
end

#terminate?(terminators, ch) ⇒ Boolean

Returns:

  • (Boolean) 


24
25
26
27
28
29
30
 
# File 'lib/formatline.rb', line 24

def terminate?(terminators, ch)
  if terminators.is_a? Regexp
    terminators === ch
  else
    terminators.include?(ch)
  end
end

#tokenize(line) ⇒ 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/formatline.rb', line 49

def tokenize(line)
  grab
  loop do 
    case curr
      when Escape; grab; add curr; grab; add curr
# puts "Found #{curr.inspect}"
      when "$"
        dollar
      when "*", "_", "`", "~"
        marker curr
        add curr
#         grab
      when LF
        break if @i >= line.size - 1
      when nil
        break
      else
        add curr
    end
    grab
  end
  add_token(:str)
  @tokenlist
end

#varsub(name) ⇒ Object 



344
345
346
347
 
# File 'lib/formatline.rb', line 344

def varsub(name)
  result = Livetext::Vars[name] || "[#{name} is undefined]"
  result
end