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Treat combined characters as paired characters

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This commit is contained in:
Kevin Sawicki
2014-10-24 09:39:35 -07:00
parent dc83f8bac7
commit ddeec5d4d5
1 changed files with 17 additions and 1 deletions
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18
src/text-utils.coffee
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@@ -7,6 +7,13 @@ isLowSurrogate = (string, index) ->
isVariationSelector = (string, index) ->
0xFE00 <= string.charCodeAt(index) <= 0xFE0F
isCombiningCharacter = (string, index) ->
0x0300 <= string.charCodeAt(index) <= 0x036F or
0x1AB0 <= string.charCodeAt(index) <= 0x1AFF or
0x1DC0 <= string.charCodeAt(index) <= 0x1DFF or
0x20D0 <= string.charCodeAt(index) <= 0x20FF or
0xFE20 <= string.charCodeAt(index) <= 0xFE2F
# Is the character at the given index the start of a high/low surrogate pair?
#
# * `string` The {String} to check for a surrogate pair.
@@ -25,6 +32,15 @@ isSurrogatePair = (string, index=0) ->
isVariationSequence = (string, index=0) ->
not isVariationSelector(string, index) and isVariationSelector(string, index + 1)
# Is the character at the given index the start of a combined character pair?
#
# * `string` The {String} to check for a combined character.
# * `index` The {Number} index to look for a variation sequence at.
#
# Return a {Boolean}.
isCombinedCharacter = (string, index=0) ->
not isCombiningCharacter(string, index) and isCombiningCharacter(string, index + 1)
# Is the character at the given index the start of high/low surrogate pair
# or a variation sequence?
#
@@ -33,7 +49,7 @@ isVariationSequence = (string, index=0) ->
#
# Return a {Boolean}.
isPairedCharacter = (string, index=0) ->
isSurrogatePair(string, index) or isVariationSequence(string, index)
isSurrogatePair(string, index) or isVariationSequence(string, index) or isCombinedCharacter(string, index)
# Does the given string contain at least surrogate pair or variation sequence?
#