class Sequel::Postgres::PGArray::Parser
PostgreSQL array parser that handles PostgreSQL array output format. Note that does not handle all forms out input that PostgreSQL will accept, and it will not raise an error for all forms of invalid input.
Public Class Methods
new(source, converter=nil)
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Set the source for the input, and any converter callable to call with objects to be created. For nested parsers the source may contain text after the end current parse, which will be ignored.
Calls superclass method
# File lib/sequel/extensions/pg_array.rb 314 def initialize(source, converter=nil) 315 super(source) 316 @converter = converter 317 @stack = [[]] 318 @encoding = string.encoding 319 @recorded = String.new.force_encoding(@encoding) 320 end
Public Instance Methods
new_entry(include_empty=false)
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Take the buffer of recorded characters and add it to the array of entries, and use a new buffer for recorded characters.
# File lib/sequel/extensions/pg_array.rb 324 def new_entry(include_empty=false) 325 if !@recorded.empty? || include_empty 326 entry = @recorded 327 if entry == 'NULL' && !include_empty 328 entry = nil 329 elsif @converter 330 entry = @converter.call(entry) 331 end 332 @stack.last.push(entry) 333 @recorded = String.new.force_encoding(@encoding) 334 end 335 end
parse()
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Parse the input character by character, returning an array of parsed (and potentially converted) objects.
# File lib/sequel/extensions/pg_array.rb 339 def parse 340 raise Sequel::Error, "invalid array, empty string" if eos? 341 raise Sequel::Error, "invalid array, doesn't start with {" unless scan(/((\[\d+:\d+\])+=)?\{/) 342 343 while !eos? 344 char = scan(/[{}",]|[^{}",]+/) 345 if char == ',' 346 # Comma outside quoted string indicates end of current entry 347 new_entry 348 elsif char == '"' 349 raise Sequel::Error, "invalid array, opening quote with existing recorded data" unless @recorded.empty? 350 while true 351 char = scan(/["\\]|[^"\\]+/) 352 if char == '\\' 353 @recorded << getch 354 elsif char == '"' 355 n = peek(1) 356 raise Sequel::Error, "invalid array, closing quote not followed by comma or closing brace" unless n == ',' || n == '}' 357 break 358 else 359 @recorded << char 360 end 361 end 362 new_entry(true) 363 elsif char == '{' 364 raise Sequel::Error, "invalid array, opening brace with existing recorded data" unless @recorded.empty? 365 366 # Start of new array, add it to the stack 367 new = [] 368 @stack.last << new 369 @stack << new 370 elsif char == '}' 371 # End of current array, add current entry to the current array 372 new_entry 373 374 if @stack.length == 1 375 raise Sequel::Error, "array parsing finished without parsing entire string" unless eos? 376 377 # Top level of array, parsing should be over. 378 # Pop current array off stack and return it as result 379 return @stack.pop 380 else 381 # Nested array, pop current array off stack 382 @stack.pop 383 end 384 else 385 # Add the character to the recorded character buffer. 386 @recorded << char 387 end 388 end 389 390 raise Sequel::Error, "array parsing finished with array unclosed" 391 end