Class: Stupidedi::Reader::TokenReader
- Inherits:
-
Object
- Object
- Stupidedi::Reader::TokenReader
- Includes:
- Inspect
- Defined in:
- lib/stupidedi/reader/token_reader.rb
Instance Attribute Summary collapse
- #input ⇒ String, Input readonly
- #segment_dict ⇒ SegmentDict
- #separators ⇒ Separators readonly
Instance Method Summary collapse
-
#consume(s) ⇒ Either<TokenReader>
If
s
occurs within #input, then the input up to and includings
is skipped and the remaining input is returned as a newTokenReader
wrapped byEither.success
. - #consume_control_chars
-
#consume_prefix(s) ⇒ Either<TokenReader>
If
s
is a prefix of #input, thens
is skipped and the remaining input is returned as a newTokenReader
wrapped byEither.success
. - #copy(changes = {}) ⇒ TokenReader
- #empty? ⇒ Boolean
-
#initialize(input, separators, segment_dict = SegmentDict.empty) ⇒ TokenReader
constructor
A new instance of TokenReader.
- #pretty_print(q)
-
#read_character ⇒ Either<Result<String>>
Returns a single character and the remaining input as a Result with a
value
of the character and aremainder
of the reamining input as a new instance of TokenReader. - #read_component_element(repeatable = false) ⇒ Either<Result<ComponentElementTok, TokenReader>>
- #read_component_elements(repeatable = false) ⇒ Either<Result<Array<ComponentElementTok, TokenReader>>>
- #read_composite_element(repeatable = false) ⇒ Either<Result<CompositeElementTok, TokenReader>>
- #read_delimiter ⇒ Either<Result<Character, TokenReader>>
- #read_elements(segment_id, element_uses) ⇒ Either<Result<Array<SimpleElementTok, CompositeElementTok>, TokenReader>>
- #read_segment ⇒ Either<Result<SegmentTok, TokenReader>>
- #read_segment_id ⇒ Either<Result<Symbol, TokenReader>>
- #read_simple_element(repeatable = false) ⇒ Either<Result<SimpleElementToken, TokenReader>>
- #stream ⇒ StreamReader
-
#stream? ⇒ Boolean
False.
Methods included from Inspect
Constructor Details
#initialize(input, separators, segment_dict = SegmentDict.empty) ⇒ TokenReader
Returns a new instance of TokenReader.
21 22 23 24 |
# File 'lib/stupidedi/reader/token_reader.rb', line 21 def initialize(input, separators, segment_dict = SegmentDict.empty) @input, @separators, @segment_dict = input, separators, segment_dict end |
Instance Attribute Details
#input ⇒ String, Input (readonly)
13 14 15 |
# File 'lib/stupidedi/reader/token_reader.rb', line 13 def input @input end |
#segment_dict ⇒ SegmentDict
19 20 21 |
# File 'lib/stupidedi/reader/token_reader.rb', line 19 def segment_dict @segment_dict end |
#separators ⇒ Separators (readonly)
16 17 18 |
# File 'lib/stupidedi/reader/token_reader.rb', line 16 def separators @separators end |
Instance Method Details
#consume(s) ⇒ Either<TokenReader>
If s
occurs within #input, then the input up to and including s
is skipped and the remaining input is returned as a new TokenReader
wrapped by Either.success
. Otherwise, Either::Failure is returned.
98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 |
# File 'lib/stupidedi/reader/token_reader.rb', line 98 def consume(s) return success(self) if s.empty? position = 0 buffer = " " * s.length while @input.defined_at?(position) character = @input.at(position) unless is_control?(character) # Slide the "window" forward one character buffer = buffer.slice(1..-1) + character end position += 1 if s == buffer return success(advance(position)) end end failure("reached end of input without finding #{s.inspect}") end |
#consume_control_chars
79 80 81 82 83 84 85 86 87 88 89 90 91 |
# File 'lib/stupidedi/reader/token_reader.rb', line 79 def consume_control_chars position = 0 while @input.defined_at?(position) and is_control?(@input.at(position)) position += 1 end if position.zero? success(self) else success(advance(position)) end end |
#consume_prefix(s) ⇒ Either<TokenReader>
If s
is a prefix of #input, then s
is skipped and the remaining
input is returned as a new TokenReader
wrapped by Either.success
.
Otherwise, an Either::Failure is returned.
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 |
# File 'lib/stupidedi/reader/token_reader.rb', line 53 def consume_prefix(s) return success(self) if s.empty? position = 0 buffer = "" while @input.defined_at?(position) character = @input.at(position) position += 1 unless is_control?(character) buffer = buffer + character if s.length == buffer.length if s == buffer return success(advance(position)) else return failure("found #{buffer.inspect} instead of #{s.inspect}") end end end end failure("reached end of input without finding #{s.inspect}") end |
#copy(changes = {}) ⇒ TokenReader
27 28 29 30 31 32 |
# File 'lib/stupidedi/reader/token_reader.rb', line 27 def copy(changes = {}) TokenReader.new \ changes.fetch(:input, @input), changes.fetch(:separators, @separators), changes.fetch(:segment_dict, @segment_dict) end |
#empty? ⇒ Boolean
44 45 46 |
# File 'lib/stupidedi/reader/token_reader.rb', line 44 def empty? @input.empty? end |
#pretty_print(q)
This method returns an undefined value.
397 398 399 400 401 402 403 404 405 406 407 408 |
# File 'lib/stupidedi/reader/token_reader.rb', line 397 def pretty_print(q) q.text("TokenReader") q.group(2, "(", ")") do q.breakable "" q.pp @input q.text "," q.breakable q.pp @separators end end |
#read_character ⇒ Either<Result<String>>
Returns a single character and the remaining input as a Result with
a value
of the character and a remainder
of the reamining input as
a new instance of Stupidedi::Reader::TokenReader. If #input has less than a single
character, returns an Either::Failure
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 |
# File 'lib/stupidedi/reader/token_reader.rb', line 128 def read_character position = 0 while @input.defined_at?(position) character = @input.at(position) position += 1 if is_control?(character) next end return result(character, advance(position)) end failure("less than one character available") end |
#read_component_element(repeatable = false) ⇒ Either<Result<ComponentElementTok, TokenReader>>
341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 |
# File 'lib/stupidedi/reader/token_reader.rb', line 341 def read_component_element(repeatable = false) position = 0 buffer = "" while @input.defined_at?(position) character = @input.at(position) position += 1 if is_control?(character) next end case character when @separators.element, @separators.segment, @separators.component # Don't consume the separator/terminator token = component(buffer, @input, @input.drop(position)) return result(token, advance(position - 1)) when @separators.repetition if repeatable # Don't consume the repetition separator token = component(buffer, @input, @input.drop(position)) return result(token, advance(position - 1)) # else # # @todo: Read this as data but sound the alarms end end buffer = buffer + character end failure("reached end of input without finding a component data element") end |
#read_component_elements(repeatable = false) ⇒ Either<Result<Array<ComponentElementTok, TokenReader>>>
216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 |
# File 'lib/stupidedi/reader/token_reader.rb', line 216 def read_component_elements(repeatable = false) read_component_element(repeatable).flatmap do |component, aR| aR.read_delimiter.flatmap do |delim, bR| case delim when @separators.segment, @separators.element, @separators.repetition # This is the last component element within the composite element, # so make it into a singleton list and don't consume the delimiter result(component.cons, aR) when @separators.component rest = bR.read_component_elements(repeatable) rest.map{|es, _| component.cons(es) } end end end end |
#read_composite_element(repeatable = false) ⇒ Either<Result<CompositeElementTok, TokenReader>>
377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 |
# File 'lib/stupidedi/reader/token_reader.rb', line 377 def read_composite_element(repeatable = false) read_component_elements(repeatable).flatmap do |components, aR| token = composite(components, @input, aR.input) aR.read_delimiter.flatmap do |delim, bR| case delim when @separators.segment, @separators.element token = token.repeated if repeatable result(token, aR) when @separators.repetition bR.read_composite_element(repeatable).map do |c, cR| c.repeated(token) end end end end end |
#read_delimiter ⇒ Either<Result<Character, TokenReader>>
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 |
# File 'lib/stupidedi/reader/token_reader.rb', line 279 def read_delimiter position = 0 while @input.defined_at?(position) character = @input.at(position) position += 1 if is_control?(character) next end if is_delimiter?(character) return result(character, advance(position)) else return failure("found #{character.inspect} instead of a delimiter") end end failure("reached end of input without finding a delimiter") end |
#read_elements(segment_id, element_uses) ⇒ Either<Result<Array<SimpleElementTok, CompositeElementTok>, TokenReader>>
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 |
# File 'lib/stupidedi/reader/token_reader.rb', line 180 def read_elements(segment_id, element_uses) if element_uses.empty? read_simple_element else element_use = element_uses.head repeatable = element_use.repeatable? if element_use.composite? read_composite_element(repeatable) else read_simple_element(repeatable) end end.flatmap do |element, aR| aR.read_delimiter.flatmap do |delim, bR| case delim when @separators.segment remainder = if segment_id == :IEA bR.stream else bR end # This is the last element before the segment terminator, make # it into a singleton list and _do_ consume the delimiter result(element.cons, remainder) when @separators.element # There is another element following the delimiter rest = bR.read_elements(segment_id, element_uses.tail) rest.map{|es, _| element.cons(es) } end end end end |
#read_segment ⇒ Either<Result<SegmentTok, TokenReader>>
146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 |
# File 'lib/stupidedi/reader/token_reader.rb', line 146 def read_segment consume_control_chars.flatmap do |start| # We might start reading a segment at "\nNM1...", where the "\n" is on # line 5, but "NM1" is on line 6. So to ensure the segment position is # line 6, we start with consume_control_characters. start.read_segment_id.flatmap do |segment_id, aR| if @segment_dict.defined_at?(segment_id) element_uses = @segment_dict.at(segment_id).element_uses else element_uses = [] end aR.read_delimiter.flatmap do |delim, bR| case delim when @separators.element rest = bR.read_elements(segment_id, element_uses) rest.map{|es, cR| segment(segment_id, start.input, cR.input, es) } when @separators.segment remainder = if segment_id == :IEA bR.stream else bR end # Consume the segment terminator result(segment(segment_id, start.input, bR.input), remainder) end end end end end |
#read_segment_id ⇒ Either<Result<Symbol, TokenReader>>
235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 |
# File 'lib/stupidedi/reader/token_reader.rb', line 235 def read_segment_id position = 0 buffer = "" while true unless @input.defined_at?(position) return eof("reached end of input without finding a segment identifier") end character = @input.at(position) position += 1 if is_delimiter?(character) break end unless is_control?(character) if buffer.length == 3 break end buffer = buffer + character end end # We only arrive here if {character} is a delimiter, or if we read # three characters into {buffer} and an additional into {character} if buffer =~ SEGMENT_ID remainder = advance(position - 1) case character when @separators.segment, @separators.element # Don't consume the delimiter result(buffer.upcase.to_sym, remainder) else failure("found #{character.inspect} following segment identifier") end else failure("found #{(buffer + character).inspect} instead of segment identifier") end end |
#read_simple_element(repeatable = false) ⇒ Either<Result<SimpleElementToken, TokenReader>>
301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 |
# File 'lib/stupidedi/reader/token_reader.rb', line 301 def read_simple_element(repeatable = false) position = 0 buffer = "" while @input.defined_at?(position) character = @input.at(position) position += 1 if is_control?(character) next end case character when @separators.segment, @separators.element # These delimiters mark the end of the element. We don't consume # the delimiter because the next reader can use the delimiter to # know which token to next expect. token = simple(buffer, @input, @input.drop(position)) token = token.repeated if repeatable return result(token, advance(position - 1)) when @separators.repetition if repeatable token = simple(buffer, @input, @input.drop(position)) rest = advance(position).read_simple_element(repeatable) return rest.map{|e, _| e.repeated(token) } # else # # @todo: Read this as data but sound the alarms end # when @separators.component # # @todo: Read this as data but sound the alarms end buffer = buffer + character end failure("reached end of input without finding a simple data element") end |
#stream ⇒ StreamReader
40 41 42 |
# File 'lib/stupidedi/reader/token_reader.rb', line 40 def stream StreamReader.new(@input) end |
#stream? ⇒ Boolean
Returns false.
35 36 37 |
# File 'lib/stupidedi/reader/token_reader.rb', line 35 def stream? false end |