135 lines
4.6 KiB
Ruby
135 lines
4.6 KiB
Ruby
|
# -*- coding: utf-8 -*-
|
||
|
|
module Sass
|
||
|
|
module SCSS
|
||
|
|
# A module containing regular expressions used
|
||
|
|
# for lexing tokens in an SCSS document.
|
||
|
|
# Most of these are taken from [the CSS3 spec](http://www.w3.org/TR/css3-syntax/#lexical),
|
||
|
|
# although some have been modified for various reasons.
|
||
|
|
module RX
|
||
|
|
# Takes a string and returns a CSS identifier
|
||
|
|
# that will have the value of the given string.
|
||
|
|
#
|
||
|
|
# @param str [String] The string to escape
|
||
|
|
# @return [String] The escaped string
|
||
|
|
def self.escape_ident(str)
|
||
|
|
return "" if str.empty?
|
||
|
|
return "\\#{str}" if str == '-' || str == '_'
|
||
|
|
out = ""
|
||
|
|
value = str.dup
|
||
|
|
out << value.slice!(0...1) if value =~ /^[-_]/
|
||
|
|
if value[0...1] =~ NMSTART
|
||
|
|
out << value.slice!(0...1)
|
||
|
|
else
|
||
|
|
out << escape_char(value.slice!(0...1))
|
||
|
|
end
|
||
|
|
out << value.gsub(/[^a-zA-Z0-9_-]/) {|c| escape_char c}
|
||
|
|
out
|
||
|
|
end
|
||
|
|
|
||
|
|
# Escapes a single character for a CSS identifier.
|
||
|
|
#
|
||
|
|
# @param c [String] The character to escape. Should have length 1
|
||
|
|
# @return [String] The escaped character
|
||
|
|
# @private
|
||
|
|
def self.escape_char(c)
|
||
|
|
return "\\%06x" % c.ord unless c =~ %r{[ -/:-~]}
|
||
|
|
"\\#{c}"
|
||
|
|
end
|
||
|
|
|
||
|
|
# Creates a Regexp from a plain text string,
|
||
|
|
# escaping all significant characters.
|
||
|
|
#
|
||
|
|
# @param str [String] The text of the regexp
|
||
|
|
# @param flags [Integer] Flags for the created regular expression
|
||
|
|
# @return [Regexp]
|
||
|
|
# @private
|
||
|
|
def self.quote(str, flags = 0)
|
||
|
|
Regexp.new(Regexp.quote(str), flags)
|
||
|
|
end
|
||
|
|
|
||
|
|
H = /[0-9a-fA-F]/
|
||
|
|
NL = /\n|\r\n|\r|\f/
|
||
|
|
UNICODE = /\\#{H}{1,6}[ \t\r\n\f]?/
|
||
|
|
s = '\u{80}-\u{D7FF}\u{E000}-\u{FFFD}\u{10000}-\u{10FFFF}'
|
||
|
|
NONASCII = /[#{s}]/
|
||
|
|
ESCAPE = /#{UNICODE}|\\[^0-9a-fA-F\r\n\f]/
|
||
|
|
NMSTART = /[_a-zA-Z]|#{NONASCII}|#{ESCAPE}/
|
||
|
|
NMCHAR = /[a-zA-Z0-9_-]|#{NONASCII}|#{ESCAPE}/
|
||
|
|
STRING1 = /\"((?:[^\n\r\f\\"]|\\#{NL}|#{ESCAPE})*)\"/
|
||
|
|
STRING2 = /\'((?:[^\n\r\f\\']|\\#{NL}|#{ESCAPE})*)\'/
|
||
|
|
|
||
|
|
IDENT = /-*#{NMSTART}#{NMCHAR}*/
|
||
|
|
NAME = /#{NMCHAR}+/
|
||
|
|
STRING = /#{STRING1}|#{STRING2}/
|
||
|
|
URLCHAR = /[#%&*-~]|#{NONASCII}|#{ESCAPE}/
|
||
|
|
URL = /(#{URLCHAR}*)/
|
||
|
|
W = /[ \t\r\n\f]*/
|
||
|
|
VARIABLE = /(\$)(#{Sass::SCSS::RX::IDENT})/
|
||
|
|
|
||
|
|
# This is more liberal than the spec's definition,
|
||
|
|
# but that definition didn't work well with the greediness rules
|
||
|
|
RANGE = /(?:#{H}|\?){1,6}/
|
||
|
|
|
||
|
|
##
|
||
|
|
|
||
|
|
S = /[ \t\r\n\f]+/
|
||
|
|
|
||
|
|
COMMENT = %r{/\*([^*]|\*+[^/*])*\**\*/}
|
||
|
|
SINGLE_LINE_COMMENT = %r{//.*(\n[ \t]*//.*)*}
|
||
|
|
|
||
|
|
CDO = quote("<!--")
|
||
|
|
CDC = quote("-->")
|
||
|
|
INCLUDES = quote("~=")
|
||
|
|
DASHMATCH = quote("|=")
|
||
|
|
PREFIXMATCH = quote("^=")
|
||
|
|
SUFFIXMATCH = quote("$=")
|
||
|
|
SUBSTRINGMATCH = quote("*=")
|
||
|
|
|
||
|
|
HASH = /##{NAME}/
|
||
|
|
|
||
|
|
IMPORTANT = /!#{W}important/i
|
||
|
|
|
||
|
|
# A unit is like an IDENT, but disallows a hyphen followed by a digit.
|
||
|
|
# This allows "1px-2px" to be interpreted as subtraction rather than "1"
|
||
|
|
# with the unit "px-2px". It also allows "%".
|
||
|
|
UNIT = /-?#{NMSTART}(?:[a-zA-Z0-9_]|#{NONASCII}|#{ESCAPE}|-(?!\.?\d))*|%/
|
||
|
|
|
||
|
|
UNITLESS_NUMBER = /(?:[0-9]+|[0-9]*\.[0-9]+)(?:[eE][+-]?\d+)?/
|
||
|
|
NUMBER = /#{UNITLESS_NUMBER}(?:#{UNIT})?/
|
||
|
|
PERCENTAGE = /#{UNITLESS_NUMBER}%/
|
||
|
|
|
||
|
|
URI = /url\(#{W}(?:#{STRING}|#{URL})#{W}\)/i
|
||
|
|
FUNCTION = /#{IDENT}\(/
|
||
|
|
|
||
|
|
UNICODERANGE = /u\+(?:#{H}{1,6}-#{H}{1,6}|#{RANGE})/i
|
||
|
|
|
||
|
|
# Defined in http://www.w3.org/TR/css3-selectors/#lex
|
||
|
|
PLUS = /#{W}\+/
|
||
|
|
GREATER = /#{W}>/
|
||
|
|
TILDE = /#{W}~/
|
||
|
|
NOT = quote(":not(", Regexp::IGNORECASE)
|
||
|
|
|
||
|
|
# 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 = /url-prefix\(#{W}(?:#{STRING}|#{URL})#{W}\)/i
|
||
|
|
DOMAIN = /domain\(#{W}(?:#{STRING}|#{URL})#{W}\)/i
|
||
|
|
|
||
|
|
# Custom
|
||
|
|
HEXCOLOR = /\#[0-9a-fA-F]+/
|
||
|
|
INTERP_START = /#\{/
|
||
|
|
ANY = /:(-[-\w]+-)?any\(/i
|
||
|
|
OPTIONAL = /!#{W}optional/i
|
||
|
|
IDENT_START = /-|#{NMSTART}/
|
||
|
|
|
||
|
|
IDENT_HYPHEN_INTERP = /-+(?=#\{)/
|
||
|
|
STRING1_NOINTERP = /\"((?:[^\n\r\f\\"#]|#(?!\{)|#{ESCAPE})*)\"/
|
||
|
|
STRING2_NOINTERP = /\'((?:[^\n\r\f\\'#]|#(?!\{)|#{ESCAPE})*)\'/
|
||
|
|
STRING_NOINTERP = /#{STRING1_NOINTERP}|#{STRING2_NOINTERP}/
|
||
|
|
|
||
|
|
STATIC_COMPONENT = /#{IDENT}|#{STRING_NOINTERP}|#{HEXCOLOR}|[+-]?#{NUMBER}|\!important/i
|
||
|
|
STATIC_VALUE = %r(#{STATIC_COMPONENT}(\s*[\s,\/]\s*#{STATIC_COMPONENT})*(?=[;}]))i
|
||
|
|
STATIC_SELECTOR = /(#{NMCHAR}|[ \t]|[,>+*]|[:#.]#{NMSTART}){1,50}([{])/i
|
||
|
|
end
|
||
|
|
end
|
||
|
|
end
|