ruby – 以编程方式获取某个.ttf字体文件支持的字符列表

在gem安装ttfunk之后,您可以通过运行以下脚本来获取所有unicode字符：

require 'ttfunk'

file = TTFunk::File.open("path/to/font.ttf")
cmap = file.cmap

chars = {}
unicode_chars = []

cmap.tables.each do |subtable|
  next if !subtable.unicode?
  chars = chars.merge( subtable.code_map )
end

unicode_chars = chars.keys.map{ |dec| dec.to_s(16) }

puts "n -- Found #{unicode_chars.length} characters in this font nn"
p unicode_chars

这将输出如下内容：

- Found 2815 characters in this font 
["20","21","22","23",...,"fef8","fef9","fefa","fefb","fefc","fffc","ffff"]