Class: Sass::Script::Lexer

Inherits:

Object

• Object
• Sass::Script::Lexer

show all

Includes:

Sass::SCSS::RX

Defined in:

/var/www/sass-pages/.sass/lib/sass/script/lexer.rb

Overview

Constant Summary

Instance Attribute Summary

• - (Fixnum) line readonly The line number of the lexer’s current position.
• - (Fixnum) offset readonly The number of bytes into the current line of the lexer’s current position.

Instance Method Summary

• - (Boolean) after_interpolation? Whether or not the last token lexed was :end_interpolation.
• - (Boolean) done? Whether or not there’s more source text to lex.
• - expected!(name) Raise an error to the effect that name was expected in the input stream and wasn’t found.
• - (Lexer) initialize(str, line, offset, options) constructor A new instance of Lexer.
• - (Token) next Moves the lexer forward one token.
• - (Token) peek Returns the next token without moving the lexer forward.
• - (String) str { ... } Records all non-comment text the lexer consumes within the block and returns it as a string.
• - unpeek! Rewinds the underlying StringScanner to before the token returned by #peek.
• - (Boolean) whitespace?(tok = @tok) Returns whether or not there’s whitespace before the next token.

Methods included from Sass::SCSS::RX

escape_ident

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 126

def initialize(str, line, offset, options)
  @scanner = str.is_a?(StringScanner) ? str : Sass::Util::MultibyteStringScanner.new(str)
  @line = line
  @offset = offset
  @options = options
  @interpolation_stack = []
  @prev = nil
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 32

def line
  @line
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 38

def offset
  @offset
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 177

def after_interpolation?
  @prev && @prev.type == :end_interpolation
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 171

def done?
  whitespace unless after_interpolation? && @interpolation_stack.last
  @scanner.eos? && @tok.nil?
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 189

def expected!(name)
  unpeek!
  Sass::SCSS::Parser.expected(@scanner, name, @line)
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 138

def next
  @tok ||= read_token
  @tok, tok = nil, @tok
  @prev = tok
  return tok
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 160

def peek
  @tok ||= read_token
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 199

def str
  old_pos = @tok ? @tok.pos : @scanner.pos
  yield
  new_pos = @tok ? @tok.pos : @scanner.pos
  @scanner.string[old_pos...new_pos]
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 166

def unpeek!
  @scanner.pos = @tok.pos if @tok
end

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# File '/var/www/sass-pages/.sass/lib/sass/script/lexer.rb', line 148

def whitespace?(tok = @tok)
  if tok
    @scanner.string[0...tok.pos] =~ /\s\Z/
  else
    @scanner.string[@scanner.pos, 1] =~ /^\s/ ||
      @scanner.string[@scanner.pos - 1, 1] =~ /\s\Z/
  end
end