/usr/lib/ruby/vendor_ruby/sass/script/lexer.rb is in ruby-sass 3.1.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Sass
module Script
# The lexical analyzer for SassScript.
# It takes a raw string and converts it to individual tokens
# that are easier to parse.
class Lexer
include Sass::SCSS::RX
# A struct containing information about an individual token.
#
# `type`: \[`Symbol`\]
# : The type of token.
#
# `value`: \[`Object`\]
# : The Ruby object corresponding to the value of the token.
#
# `line`: \[`Fixnum`\]
# : The line of the source file on which the token appears.
#
# `offset`: \[`Fixnum`\]
# : The number of bytes into the line the SassScript token appeared.
#
# `pos`: \[`Fixnum`\]
# : The scanner position at which the SassScript token appeared.
Token = Struct.new(:type, :value, :line, :offset, :pos)
# The line number of the lexer's current position.
#
# @return [Fixnum]
attr_reader :line
# The number of bytes into the current line
# of the lexer's current position.
#
# @return [Fixnum]
attr_reader :offset
# A hash from operator strings to the corresponding token types.
OPERATORS = {
'+' => :plus,
'-' => :minus,
'*' => :times,
'/' => :div,
'%' => :mod,
'=' => :single_eq,
':' => :colon,
'(' => :lparen,
')' => :rparen,
',' => :comma,
'and' => :and,
'or' => :or,
'not' => :not,
'==' => :eq,
'!=' => :neq,
'>=' => :gte,
'<=' => :lte,
'>' => :gt,
'<' => :lt,
'#{' => :begin_interpolation,
'}' => :end_interpolation,
';' => :semicolon,
'{' => :lcurly,
}
OPERATORS_REVERSE = Sass::Util.map_hash(OPERATORS) {|k, v| [v, k]}
TOKEN_NAMES = Sass::Util.map_hash(OPERATORS_REVERSE) {|k, v| [k, v.inspect]}.merge({
:const => "variable (e.g. $foo)",
:ident => "identifier (e.g. middle)",
:bool => "boolean (e.g. true, false)",
})
# A list of operator strings ordered with longer names first
# so that `>` and `<` don't clobber `>=` and `<=`.
OP_NAMES = OPERATORS.keys.sort_by {|o| -o.size}
# A sub-list of {OP_NAMES} that only includes operators
# with identifier names.
IDENT_OP_NAMES = OP_NAMES.select {|k, v| k =~ /^\w+/}
# A hash of regular expressions that are used for tokenizing.
REGULAR_EXPRESSIONS = {
:whitespace => /\s+/,
:comment => COMMENT,
:single_line_comment => SINGLE_LINE_COMMENT,
:variable => /(\$)(#{IDENT})/,
:ident => /(#{IDENT})(\()?/,
:number => /(-)?(?:(\d*\.\d+)|(\d+))([a-zA-Z%]+)?/,
:color => HEXCOLOR,
:bool => /(true|false)\b/,
:ident_op => %r{(#{Regexp.union(*IDENT_OP_NAMES.map{|s| Regexp.new(Regexp.escape(s) + "(?!#{NMCHAR}|\Z)")})})},
:op => %r{(#{Regexp.union(*OP_NAMES)})},
}
class << self
private
def string_re(open, close)
/#{open}((?:\\.|\#(?!\{)|[^#{close}\\#])*)(#{close}|#\{)/
end
end
# A hash of regular expressions that are used for tokenizing strings.
#
# The key is a `[Symbol, Boolean]` pair.
# The symbol represents which style of quotation to use,
# while the boolean represents whether or not the string
# is following an interpolated segment.
STRING_REGULAR_EXPRESSIONS = {
[:double, false] => string_re('"', '"'),
[:single, false] => string_re("'", "'"),
[:double, true] => string_re('', '"'),
[:single, true] => string_re('', "'"),
[:uri, false] => /url\(#{W}(#{URLCHAR}*?)(#{W}\)|#\{)/,
[:uri, true] => /(#{URLCHAR}*?)(#{W}\)|#\{)/,
}
# @param str [String, StringScanner] The source text to lex
# @param line [Fixnum] The line on which the SassScript appears.
# Used for error reporting
# @param offset [Fixnum] The number of characters in on which the SassScript appears.
# Used for error reporting
# @param options [{Symbol => Object}] An options hash;
# see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
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
# Moves the lexer forward one token.
#
# @return [Token] The token that was moved past
def next
@tok ||= read_token
@tok, tok = nil, @tok
@prev = tok
return tok
end
# Returns whether or not there's whitespace before the next token.
#
# @return [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
# Returns the next token without moving the lexer forward.
#
# @return [Token] The next token
def peek
@tok ||= read_token
end
# Rewinds the underlying StringScanner
# to before the token returned by \{#peek}.
def unpeek!
@scanner.pos = @tok.pos if @tok
end
# @return [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
# @return [Boolean] Whether or not the last token lexed was `:end_interpolation`.
def after_interpolation?
@prev && @prev.type == :end_interpolation
end
# Raise an error to the effect that `name` was expected in the input stream
# and wasn't found.
#
# This calls \{#unpeek!} to rewind the scanner to immediately after
# the last returned token.
#
# @param name [String] The name of the entity that was expected but not found
# @raise [Sass::SyntaxError]
def expected!(name)
unpeek!
Sass::SCSS::Parser.expected(@scanner, name, @line)
end
# Records all non-comment text the lexer consumes within the block
# and returns it as a string.
#
# @yield A block in which text is recorded
# @return [String]
def str
old_pos = @tok ? @tok.pos : @scanner.pos
yield
new_pos = @tok ? @tok.pos : @scanner.pos
@scanner.string[old_pos...new_pos]
end
private
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 whitespace
nil while scan(REGULAR_EXPRESSIONS[:whitespace]) ||
scan(REGULAR_EXPRESSIONS[:comment]) ||
scan(REGULAR_EXPRESSIONS[:single_line_comment])
end
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 || special_val || ident_op || ident || op
end
def variable
_variable(REGULAR_EXPRESSIONS[:variable])
end
def _variable(rx)
line = @line
offset = @offset
return unless scan(rx)
[:const, @scanner[2]]
end
def ident
return unless scan(REGULAR_EXPRESSIONS[:ident])
[@scanner[2] ? :funcall : :ident, @scanner[1]]
end
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 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 color
return unless s = scan(REGULAR_EXPRESSIONS[:color])
raise Sass::SyntaxError.new(<<MESSAGE.rstrip) unless s.size == 4 || s.size == 7
Colors must have either three or six digits: '#{s}'
MESSAGE
value = s.scan(/^#(..?)(..?)(..?)$/).first.
map {|num| num.ljust(2, num).to_i(16)}
[:color, Script::Color.new(value)]
end
def bool
return unless s = scan(REGULAR_EXPRESSIONS[:bool])
[:bool, Script::Bool.new(s == 'true')]
end
def special_fun
return unless str1 = scan(/((-[\w-]+-)?calc|expression|progid:[a-z\.]*)\(/i)
str2, _ = Sass::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,
Sass::Util.merge_adjacent_strings(
[str1] + Sass::Engine.parse_interp(str2, old_line, old_offset, @options)),
str1.size + str2.size]
end
def special_val
return unless scan(/!important/i)
[:string, Script::String.new("!important")]
end
def ident_op
return unless op = scan(REGULAR_EXPRESSIONS[:ident_op])
[OPERATORS[op]]
end
def op
return unless op = scan(REGULAR_EXPRESSIONS[:op])
@interpolation_stack << nil if op == :begin_interpolation
[OPERATORS[op]]
end
def raw(rx)
return unless val = scan(rx)
[:raw, val]
end
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 current_position
@offset + 1
end
end
end
end
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