Module: CSS::CodePoints

Included in:
Escape, Tokenizer
Defined in:
lib/css/code_points.rb

Overview

Character class predicates from CSS Syntax §4.2 Definitions, plus the U+FFFD replacement character used both during tokenization and serialization. Implemented with char comparisons rather than regex to avoid pattern-match overhead in the tokenizer’s inner loop.

Constant Summary collapse

REPLACEMENT = 
"�".freeze

Class Method Summary collapse

Class Method Details

.digit?(c) ⇒ Boolean

Returns:

  • (Boolean) 


11
12
13
 
# File 'lib/css/code_points.rb', line 11

def digit?(c)
  !c.nil? && c >= '0' && c <= '9'
end

.hex_digit?(c) ⇒ Boolean

Returns:

  • (Boolean) 


15
16
17
18
19
 
# File 'lib/css/code_points.rb', line 15

def hex_digit?(c)
  return false if c.nil?

  (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f')
end

.ident_code_point?(c) ⇒ Boolean

Returns:

  • (Boolean) 


28
29
30
31
32
33
34
 
# File 'lib/css/code_points.rb', line 28

def ident_code_point?(c)
  return false if c.nil?
  return true  if c == '_' || c == '-' || (c >= '0' && c <= '9')
  return true  if (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')

  c.ord >= 0x80
end

.ident_start_code_point?(c) ⇒ Boolean

Returns:

  • (Boolean) 


21
22
23
24
25
26
 
# File 'lib/css/code_points.rb', line 21

def ident_start_code_point?(c)
  return false if c.nil?
  return true  if c == '_' || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')

  c.ord >= 0x80
end