class Sass::Script::Lexer
that are easier to parse.
It takes a raw string and converts it to individual tokens
The lexical analyzer for SassScript.
def _variable(rx)
def _variable(rx) line = @line offset = @offset return unless scan(rx) if @scanner[1] == '!' && @scanner[2] != 'important' Script.var_warning(@scanner[2], line, offset + 1, @options[:filename]) end [:const, @scanner[2]] end
def after_interpolation?
-
(Boolean)
- Whether or not the last token lexed was `:end_interpolation`.
def after_interpolation? @prev && @prev.type == :end_interpolation end
def bool
def bool return unless s = scan(REGULAR_EXPRESSIONS[:bool]) [:bool, Script::Bool.new(s == 'true')] end
def color
def color return unless s = scan(REGULAR_EXPRESSIONS[:color]) raise Sass::SyntaxError.new(<<MESSAGE) unless s.size == 4 || s.size == 7 must have either three or six digits: '#{s}' E value = s.scan(/^#(..?)(..?)(..?)$/).first. map {|num| num.ljust(2, num).to_i(16)} [:color, Script::Color.new(value)] end
def current_position
def current_position @offset + 1 end
def done?
-
(Boolean)
- Whether or not there's more source text to lex.
def done? whitespace unless after_interpolation? && @interpolation_stack.last @scanner.eos? && @tok.nil? end
def expected!(name)
-
(Sass::SyntaxError)
-
Parameters:
-
name
(String
) -- The name of the entity that was expected but not found
def expected!(name) unpeek! Sass::SCSS::Parser.expected(@scanner, name, @line) end
def ident
def ident return unless scan(REGULAR_EXPRESSIONS[:ident]) [@scanner[2] ? :funcall : :ident, @scanner[1]] end
def ident_op
def ident_op return unless op = scan(REGULAR_EXPRESSIONS[:ident_op]) [OPERATORS[op]] end
def initialize(str, line, offset, options)
-
options
({Symbol => Object}
) -- An options hash; -
offset
(Fixnum
) -- The number of characters in on which the SassScript appears. -
line
(Fixnum
) -- The line on which the SassScript appears. -
str
(String, StringScanner
) -- The source text to lex
def initialize(str, line, offset, options) @scanner = str.is_a?(StringScanner) ? str : StringScanner.new(str) @line = line @offset = offset @options = options @interpolation_stack = [] @prev = nil end
def next
-
(Token)
- The token that was moved past
def next @tok ||= read_token @tok, tok = nil, @tok @prev = tok return tok end
def number
def number return unless scan(REGULAR_EXPRESSIONS[:number]) value = @scanner[2] ? @scanner[2].to_f : @scanner[3].to_i value = -value if @scanner[1] [:number, Script::Number.new(value, Array(@scanner[4]))] end
def op
def op return unless op = scan(REGULAR_EXPRESSIONS[:op]) @interpolation_stack << nil if op == :begin_interpolation [OPERATORS[op]] end
def peek
-
(Token)
- The next token
def peek @tok ||= read_token end
def raw(rx)
def raw(rx) return unless val = scan(rx) [:raw, val] end
def read_token
def read_token return if done? return unless value = token type, val, size = value size ||= @scanner.matched_size val.line = @line if val.is_a?(Script::Node) Token.new(type, val, @line, current_position - size, @scanner.pos - size) end
def scan(re)
def scan(re) return unless str = @scanner.scan(re) c = str.count("\n") @line += c @offset = (c == 0 ? @offset + str.size : str[/\n(.*)/, 1].size) str end
def special_fun
def special_fun return unless str1 = scan(/(calc|expression|progid:[a-z\.]*)\(/i) str2, _ = Haml::Shared.balance(@scanner, ?(, ?), 1) c = str2.count("\n") old_line = @line old_offset = @offset @line += c @offset = (c == 0 ? @offset + str2.size : str2[/\n(.*)/, 1].size) [:special_fun, Haml::Util.merge_adjacent_strings( [str1] + Sass::Engine.parse_interp(str2, old_line, old_offset, @options)), str1.size + str2.size] end
def str
-
(String)
-
Other tags:
- Yield: - A block in which text is recorded
def str old_pos = @tok ? @tok.pos : @scanner.pos yield new_pos = @tok ? @tok.pos : @scanner.pos @scanner.string[old_pos...new_pos] end
def string(re, open)
def string(re, open) return unless scan(STRING_REGULAR_EXPRESSIONS[[re, open]]) if @scanner[2] == '#{' #' @scanner.pos -= 2 # Don't actually consume the #{ @interpolation_stack << re end str = if re == :uri Script::String.new("#{'url(' unless open}#{@scanner[1]}#{')' unless @scanner[2] == '#{'}") else Script::String.new(@scanner[1].gsub(/\\(['"]|\#\{)/, '\1'), :string) end [:string, str] end
def string_re(open, close)
def string_re(open, close) /#{open}((?:\\.|\#(?!\{)|[^#{close}\\#])*)(#{close}|#\{)/ end
def token
def token if after_interpolation? && (interp_type = @interpolation_stack.pop) return string(interp_type, true) end variable || string(:double, false) || string(:single, false) || number || color || bool || string(:uri, false) || raw(UNICODERANGE) || special_fun || ident_op || ident || op end
def unpeek!
Rewinds the underlying StringScanner
def unpeek! @scanner.pos = @tok.pos if @tok end
def variable
def variable _variable(REGULAR_EXPRESSIONS[:variable]) end
def whitespace
def whitespace nil while scan(REGULAR_EXPRESSIONS[:whitespace]) || scan(REGULAR_EXPRESSIONS[:comment]) || scan(REGULAR_EXPRESSIONS[:single_line_comment]) end
def whitespace?(tok = @tok)
-
(Boolean)
-
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