Class: YARD::Parser::Ruby::Legacy::RubyLex::BufferedReader

### Home Classes Methods

### In Files

- lib/yard/parser/ruby/legacy/ruby_lex.rb

### Parent

Object

### Methods

- ::new
- #column
- #divert_read_from
- #get_read
- #getc
- #getc_already_read
- #peek
- #peek_equal
- #ungetc

### Files

- LICENSE.txt
- MIT.txt

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No matching classes.

# YARD::Parser::Ruby::Legacy::RubyLex::BufferedReader

Read an input stream character by character. We allow for unlimited ungetting of characters just read.

We simplify the implementation greatly by reading the entire input into a buffer initially, and then simply traversing it using pointers.

We also have to allow for the here document diversion. This little gem comes about when the lexer encounters a here document. At this point we effectively need to split the input stream into two parts: one to read the body of the here document, the other to read the rest of the input line where the here document was initially encountered. For example, we might have

    do_something(<<-A, <<-B)
      stuff
      for
    A
      stuff
      for
    B

When the lexer encounters the <<A, it reads until the end of the line, and keeps it around for later. It then reads the body of the here document. Once complete, it needs to read the rest of the original line, but then skip the here document body.

@private

### Attributes

line_num[R]

### Public Class Methods

new(content) click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 365
    def initialize(content)
      if /\t/ =~ content
        tab_width = 2
        content = content.split(/\n/).map do |line|
          1 while line.gsub!(/\t+/) { ' ' * (tab_width*$&.length - $`.length % tab_width)}  && $~ #`
          line
        end .join("\n")
      end
      @content   = content
      @content << "\n" unless @content[-1,1] == "\n"
      @size      = @content.size
      @offset    = 0
      @hwm       = 0
      @line_num  = 1
      @read_back_offset = 0
      @last_newline = 0
      @newline_pending = false
    end

### Public Instance Methods

column() click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 384
    def column
      @offset - @last_newline
    end

divert_read_from(reserve) click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 438
    def divert_read_from(reserve)
      @content[@offset, 0] = reserve
      @size      = @content.size
    end

get_read() click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 419
    def get_read
      res = @content[@read_back_offset...@offset]
      @read_back_offset = @offset
      res
    end

getc() click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 388
    def getc
      return nil if @offset >= @size
      ch = @content[@offset, 1]

      @offset += 1
      @hwm = @offset if @hwm < @offset

      if @newline_pending
        @line_num += 1
        @last_newline = @offset - 1
        @newline_pending = false
      end

      if ch == "\n"
        @newline_pending = true
      end
      ch
    end

getc_already_read() click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 407
    def getc_already_read
      getc
    end

peek(at) click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 425
    def peek(at)
      pos = @offset + at
      if pos >= @size
        nil
      else
        @content[pos, 1]
      end
    end

peek_equal(str) click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 434
    def peek_equal(str)
      @content[@offset, str.length] == str
    end

ungetc(ch) click to toggle source

    # File lib/yard/parser/ruby/legacy/ruby_lex.rb, line 411
    def ungetc(ch)
      raise "unget past beginning of file" if @offset <= 0
      @offset -= 1
      if @content[@offset] == \n\
        @newline_pending = false
      end
    end

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