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# frozen_string_literal: true ## # Collection of methods for writing parsers module RDoc::Parser::RubyTools ## # Adds a token listener +obj+, but you should probably use token_listener def add_token_listener(obj) @token_listeners ||= [] @token_listeners << obj end ## # Fetches the next token from the scanner def get_tk tk = nil if @tokens.empty? then if @scanner_point >= @scanner.size return nil else tk = @scanner[@scanner_point] @scanner_point += 1 @read.push tk[:text] end else @read.push @unget_read.shift tk = @tokens.shift end if tk == nil || :on___end__ == tk[:kind] tk = nil end return nil unless tk # inform any listeners of our shiny new token @token_listeners.each do |obj| obj.add_token(tk) end if @token_listeners tk end ## # Reads and returns all tokens up to one of +tokens+. Leaves the matched # token in the token list. def get_tk_until(*tokens) read = [] loop do tk = get_tk case tk when *tokens then unget_tk tk break end read << tk end read end ## # Retrieves a String representation of the read tokens def get_tkread read = @read.join("") @read = [] read end ## # Peek equivalent for get_tkread def peek_read @read.join('') end ## # Peek at the next token, but don't remove it from the stream def peek_tk unget_tk(tk = get_tk) tk end ## # Removes the token listener +obj+ def remove_token_listener(obj) @token_listeners.delete(obj) end ## # Resets the tools def reset @read = [] @tokens = [] @unget_read = [] @nest = 0 @scanner_point = 0 end ## # Skips whitespace tokens including newlines def skip_tkspace tokens = [] while (tk = get_tk) and (:on_sp == tk[:kind] or :on_nl == tk[:kind] or :on_ignored_nl == tk[:kind]) do tokens.push(tk) end unget_tk(tk) tokens end ## # Skips whitespace tokens excluding newlines def skip_tkspace_without_nl tokens = [] while (tk = get_tk) and :on_sp == tk[:kind] do tokens.push(tk) end unget_tk(tk) tokens end ## # Has +obj+ listen to tokens def token_listener(obj) add_token_listener obj yield ensure remove_token_listener obj end ## # Returns +tk+ to the scanner def unget_tk(tk) @tokens.unshift tk @unget_read.unshift @read.pop # Remove this token from any listeners @token_listeners.each do |obj| obj.pop_token end if @token_listeners nil end end