Module: Fontisan::Unicode::Plane

Defined in:
lib/fontisan/unicode/plane.rb

Overview

Unicode plane metadata. A plane is a contiguous range of 65,536 codepoints; cp >> 16 is the plane number.

Plane labels follow the Unicode standard names. Unassigned planes fall back to "Plane_N". This is a pure-data module — no I/O, no state, no dependency on tables or stitcher.

Constant Summary collapse

BMP = 
0
SMP = 
1
SIP = 
2
TIP = 
3
SSP = 
14
LARGE_CJK_BLOCKS =

The handful of mega-blocks large enough to overflow a single plane's 65,535-glyph cap when partitioning by plane. Range + label only — full Unicode Blocks.txt data lives in Block (follow-up).

{
  "CJK_Ext_B" => 0x2A700..0x2B73F,
  "CJK_Ext_C" => 0x2B740..0x2B81F,
  "CJK_Ext_D" => 0x2B820..0x2CEAF,
  "CJK_Ext_E" => 0x2CEB0..0x2EBEF,
  "CJK_Ext_F" => 0x2EBF0..0x2EE5F,
}.freeze

Class Method Summary collapse

Class Method Details

.label(plane) ⇒ String

Returns human-readable plane label.

Parameters:

  • plane (Integer)

Returns:

  • (String) —

    human-readable plane label



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# File 'lib/fontisan/unicode/plane.rb', line 38

def self.label(plane)
  case plane
  when BMP then "BMP"
  when SMP then "SMP"
  when SIP then "SIP"
  when TIP then "TIP"
  when SSP then "SSP"
  else "Plane_#{plane}"
  end
end

.label_of(codepoint) ⇒ String

Returns label of the plane containing codepoint.

Parameters:

  • codepoint (Integer)

Returns:

  • (String) —

    label of the plane containing codepoint



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# File 'lib/fontisan/unicode/plane.rb', line 51

def self.label_of(codepoint)
  label(of(codepoint))
end

.of(codepoint) ⇒ Integer

Returns plane number (0..16).

Parameters:

  • codepoint (Integer)

Returns:

  • (Integer) —

    plane number (0..16)



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# File 'lib/fontisan/unicode/plane.rb', line 32

def self.of(codepoint)
  codepoint >> 16
end