/usr/lib/ruby/vendor_ruby/sass/script/lexer.rb is in ruby-sass 3.4.6-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 | require 'sass/scss/rx'
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.
#
# `source_range`: \[`Sass::Source::Range`\]
# : The range in the source file in which the token appeared.
#
# `pos`: \[`Fixnum`\]
# : The scanner position at which the SassScript token appeared.
Token = Struct.new(:type, :value, :source_range, :pos)
# The line number of the lexer's current position.
#
# @return [Fixnum]
def line
return @line unless @tok
@tok.source_range.start_pos.line
end
# The number of bytes into the current line
# of the lexer's current position (1-based).
#
# @return [Fixnum]
def offset
return @offset unless @tok
@tok.source_range.start_pos.offset
end
# 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,
'...' => :splat,
}
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)")
# 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+/}
PARSEABLE_NUMBER = /(?:(\d*\.\d+)|(\d+))(?:[eE]([+-]?\d+))?(#{UNIT})?/
# 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 => PARSEABLE_NUMBER,
:unary_minus_number => /-#{PARSEABLE_NUMBER}/,
:color => HEXCOLOR,
:id => /##{IDENT}/,
:selector => /&/,
:ident_op => /(#{Regexp.union(*IDENT_OP_NAMES.map do |s|
Regexp.new(Regexp.escape(s) + "(?!#{NMCHAR}|\Z)")
end)})/,
:op => /(#{Regexp.union(*OP_NAMES)})/,
}
class << self
private
def string_re(open, close)
/#{open}((?:\\.|\#(?!\{)|[^#{close}\\#])*)(#{close}|#\{)/m
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('"', '"'),
true => string_re('', '"')
},
:single => {
false => string_re("'", "'"),
true => string_re('', "'")
},
:uri => {
false => /url\(#{W}(#{URLCHAR}*?)(#{W}\)|#\{)/,
true => /(#{URLCHAR}*?)(#{W}\)|#\{)/
},
# Defined in https://developer.mozilla.org/en/CSS/@-moz-document as a
# non-standard version of http://www.w3.org/TR/css3-conditional/
:url_prefix => {
false => /url-prefix\(#{W}(#{URLCHAR}*?)(#{W}\)|#\{)/,
true => /(#{URLCHAR}*?)(#{W}\)|#\{)/
},
:domain => {
false => /domain\(#{W}(#{URLCHAR}*?)(#{W}\)|#\{)/,
true => /(#{URLCHAR}*?)(#{W}\)|#\{)/
}
}
# @param str [String, StringScanner] The source text to lex
# @param line [Fixnum] The 1-based line on which the SassScript appears.
# Used for error reporting and sourcemap building
# @param offset [Fixnum] The 1-based character (not byte) offset in the line in the source.
# Used for error reporting and sourcemap building
# @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
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!
if @tok
@scanner.pos = @tok.pos
@line = @tok.source_range.start_pos.line
@offset = @tok.source_range.start_pos.offset
end
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?
start_pos = source_position
value = token
return unless value
type, val = value
Token.new(type, val, range(start_pos), @scanner.pos - @scanner.matched_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 = @interpolation_stack.pop)
interp_type, interp_value = interp
if interp_type == :special_fun
return special_fun_body(interp_value)
else
raise "[BUG]: Unknown interp_type #{interp_type}" unless interp_type == :string
return string(interp_value, true)
end
end
variable || string(:double, false) || string(:single, false) || number || id || color ||
selector || string(:uri, false) || raw(UNICODERANGE) || special_fun || special_val ||
ident_op || ident || op
end
def variable
_variable(REGULAR_EXPRESSIONS[:variable])
end
def _variable(rx)
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)
line, offset = @line, @offset
return unless scan(STRING_REGULAR_EXPRESSIONS[re][open])
if @scanner[0] =~ /([^\\]|^)\n/
filename = @options[:filename]
Sass::Util.sass_warn <<MESSAGE
DEPRECATION WARNING on line #{line}, column #{offset}#{" of #{filename}" if filename}:
Unescaped multiline strings are deprecated and will be removed in a future version of Sass.
To include a newline in a string, use "\\a" or "\\a " as in CSS.
MESSAGE
end
if @scanner[2] == '#{' # '
@scanner.pos -= 2 # Don't actually consume the #{
@offset -= 2
@interpolation_stack << [:string, re]
end
str =
if re == :uri
url = "#{'url(' unless open}#{@scanner[1]}#{')' unless @scanner[2] == '#{'}"
Script::Value::String.new(url)
else
Script::Value::String.new(Sass::Script::Value::String.value(@scanner[1]), :string)
end
[:string, str]
end
def number
# Handling unary minus is complicated by the fact that whitespace is an
# operator in SassScript. We want "1-2" to be parsed as "1 - 2", but we
# want "1 -2" to be parsed as "1 (-2)". To accomplish this, we only
# parse a unary minus as part of a number literal if there's whitespace
# before and not after it. Cases like "(-2)" are handled by the unary
# minus logic in the parser instead.
if @scanner.peek(1) == '-'
return if @scanner.pos == 0
unary_minus_allowed =
case @scanner.string[@scanner.pos - 1, 1]
when /\s/; true
when '/'; @scanner.pos != 1 && @scanner.string[@scanner.pos - 2, 1] == '*'
else; false
end
return unless unary_minus_allowed
return unless scan(REGULAR_EXPRESSIONS[:unary_minus_number])
minus = true
else
return unless scan(REGULAR_EXPRESSIONS[:number])
minus = false
end
value = (@scanner[1] ? @scanner[1].to_f : @scanner[2].to_i) * (minus ? -1 : 1)
value *= 10**@scanner[3].to_i if @scanner[3]
script_number = Script::Value::Number.new(value, Array(@scanner[4]))
[:number, script_number]
end
def id
# Colors and ids are tough to tell apart, because they overlap but
# neither is a superset of the other. "#xyz" is an id but not a color,
# "#000" is a color but not an id, "#abc" is both, and "#0" is neither.
# We need to handle all these cases correctly.
#
# To do so, we first try to parse something as an id. If this works and
# the id is also a valid color, we return the color. Otherwise, we
# return the id. If it didn't parse as an id, we then try to parse it as
# a color. If *this* works, we return the color, and if it doesn't we
# give up and throw an error.
#
# IDs in properties are used in the Basic User Interface Module
# (http://www.w3.org/TR/css3-ui/).
return unless scan(REGULAR_EXPRESSIONS[:id])
if @scanner[0] =~ /^\#[0-9a-fA-F]+$/ && (@scanner[0].length == 4 || @scanner[0].length == 7)
return [:color, Script::Value::Color.from_hex(@scanner[0])]
end
[:ident, @scanner[0]]
end
def color
return unless @scanner.match?(REGULAR_EXPRESSIONS[:color])
return unless @scanner[0].length == 4 || @scanner[0].length == 7
script_color = Script::Value::Color.from_hex(scan(REGULAR_EXPRESSIONS[:color]))
[:color, script_color]
end
def selector
start_pos = source_position
return unless scan(REGULAR_EXPRESSIONS[:selector])
script_selector = Script::Tree::Selector.new
script_selector.source_range = range(start_pos)
[:selector, script_selector]
end
def special_fun
prefix = scan(/((-[\w-]+-)?(calc|element)|expression|progid:[a-z\.]*)\(/i)
return unless prefix
special_fun_body(1, prefix)
end
def special_fun_body(parens, prefix = nil)
str = prefix || ''
while (scanned = scan(/.*?([()]|\#\{)/m))
str << scanned
if scanned[-1] == ?(
parens += 1
next
elsif scanned[-1] == ?)
parens -= 1
next unless parens == 0
else
raise "[BUG] Unreachable" unless @scanner[1] == '#{' # '
str.slice!(-2..-1)
@scanner.pos -= 2 # Don't actually consume the #{
@offset -= 2
@interpolation_stack << [:special_fun, parens]
end
return [:special_fun, Sass::Script::Value::String.new(str)]
end
scan(/.*/)
expected!('")"')
end
def special_val
return unless scan(/!important/i)
[:string, Script::Value::String.new("!important")]
end
def ident_op
op = scan(REGULAR_EXPRESSIONS[:ident_op])
return unless op
[OPERATORS[op]]
end
def op
op = scan(REGULAR_EXPRESSIONS[:op])
return unless op
name = OPERATORS[op]
if name == :begin_interpolation && !@interpolation_stack.empty?
[:string_interpolation]
else
[name]
end
end
def raw(rx)
val = scan(rx)
return unless val
[:raw, val]
end
def scan(re)
str = @scanner.scan(re)
return unless str
c = str.count("\n")
@line += c
@offset = (c == 0 ? @offset + str.size : str.size - str.rindex("\n"))
str
end
def range(start_pos, end_pos = source_position)
Sass::Source::Range.new(start_pos, end_pos, @options[:filename], @options[:importer])
end
def source_position
Sass::Source::Position.new(@line, @offset)
end
end
end
end
|