react-saasify-chrisvxd

{CR,LF,Control,Extend,Regional_Indicator,SpacingMark,L,V,T,LV,LVT} = require './classes.json' UnicodeTrie = require 'unicode-trie' fs = require 'fs' classTrie = new UnicodeTrie fs.readFileSync __dirname + '/classes.trie' # Gets a code point from a UTF-16 string # handling surrogate pairs appropriately codePointAt = (str, idx) -> idx = idx or 0 code = str.charCodeAt(idx) # High surrogate if 0xD800 <= code <= 0xDBFF hi = code low = str.charCodeAt(idx + 1) if 0xDC00 <= low <= 0xDFFF return ((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000 return hi # Low surrogate if 0xDC00 <= code <= 0xDFFF hi = str.charCodeAt(idx - 1) low = code if 0xD800 <= hi <= 0xDBFF return ((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000 return low return code # Returns whether a break is allowed between the # two given grapheme breaking classes shouldBreak = (previous, current) -> # GB3. CR X LF if previous is CR and current is LF return false # GB4. (Control|CR|LF) ÷ else if previous in [Control, CR, LF] return true # GB5. ÷ (Control|CR|LF) else if current in [Control, CR, LF] return true # GB6. L X (L|V|LV|LVT) else if previous is L and current in [L, V, LV, LVT] return false # GB7. (LV|V) X (V|T) else if previous in [LV, V] and current in [V, T] return false # GB8. (LVT|T) X (T) else if previous in [LVT, T] and current is T return false # GB8a. Regional_Indicator X Regional_Indicator else if previous is Regional_Indicator and current is Regional_Indicator return false # GB9. X Extend else if current is Extend return false # GB9a. X SpacingMark else if current is SpacingMark return false # GB9b. Prepend X (there are currently no characters with this class) # else if previous is Prepend # return false # GB10. Any ÷ Any return true # Returns the next grapheme break in the string after the given index exports.nextBreak = (string, index = 0) -> if index < 0 return 0 if index >= string.length - 1 return string.length prev = classTrie.get codePointAt(string, index) for i in [index + 1...string.length] by 1 # check for already processed low surrogates continue if 0xd800 <= string.charCodeAt(i - 1) <= 0xdbff and 0xdc00 <= string.charCodeAt(i) <= 0xdfff next = classTrie.get codePointAt(string, i) if shouldBreak prev, next return i prev = next return string.length # Returns the next grapheme break in the string before the given index exports.previousBreak = (string, index = string.length) -> if index > string.length return string.length if index <= 1 return 0 index-- next = classTrie.get codePointAt(string, index) for i in [index - 1..0] by -1 # check for already processed high surrogates continue if 0xd800 <= string.charCodeAt(i) <= 0xdbff and 0xdc00 <= string.charCodeAt(i + 1) <= 0xdfff prev = classTrie.get codePointAt(string, i) if shouldBreak prev, next return i + 1 next = prev return 0 # Breaks the given string into an array of grapheme cluster strings exports.break = (str) -> res = [] index = 0 while (brk = exports.nextBreak(str, index)) < str.length res.push str.slice(index, brk) index = brk if index < str.length res.push str.slice(index) return res # Returns the number of grapheme clusters there are in the given string exports.countBreaks = (str) -> count = 0 index = 0 while (brk = exports.nextBreak(str, index)) < str.length index = brk count++ if index < str.length count++ return count