HTML Special Entity Codes in Actionscript3/Flex
I have a Flex/Actionscript 3 application that displays RSS feeds in a Text element. It strips out any HTML formatting present, but it's not handling开发者_运维知识库 HTML special entity codes properly -- it's rendering &mdash as the literal string instead of replacing it with an em-dash, etc. Is there any systematic way I can make it handle those codes properly, or am I going to need to manually replace those strings regex style?
Edit: Some aspects of Flex behavior that are relevant: both
text and htmlText handle a limited subset of the characters properly with no further tweaking -- <, >,  , etc. (In fact, text actually handles them a little better than htmlText, as the latter treats < as a literal less-than character.) But there's a much larger set of characters (°, &mdash, and many others) that aren't handled properly -- at least, not by default.Here is one way:
static private var entityMap:Object = { ' ':' ', '¡':'¡', '¢':'¢', '£':'£', '¤':'¤', '¥':'¥', '¦':'¦', '§':'§', '¨':'¨', '©':'©', 'ª':'ª', '«':'«', '¬':'¬', '­':'­', '®':'®', '¯':'¯', '°':'°', '±':'±', '²':'²', '³':'³', '´':'´', 'µ':'µ', '¶':'¶', '·':'·', '¸':'¸', '¹':'¹', 'º':'º', '»':'»', '¼':'¼', '½':'½', '¾':'¾', '¿':'¿', 'À':'À', 'Á':'Á', 'Â':'Â', 'Ã':'Ã', 'Ä':'Ä', 'Å':'Å', 'Æ':'Æ', 'Ç':'Ç', 'È':'È', 'É':'É', 'Ê':'Ê', 'Ë':'Ë', 'Ì':'Ì', 'Í':'Í', 'Î':'Î', 'Ï':'Ï', 'Ð':'Ð', 'Ñ':'Ñ', 'Ò':'Ò', 'Ó':'Ó', 'Ô':'Ô', 'Õ':'Õ', 'Ö':'Ö', '×':'×', 'Ø':'Ø', 'Ù':'Ù', 'Ú':'Ú', 'Û':'Û', 'Ü':'Ü', 'Ý':'Ý', 'Þ':'Þ', 'ß':'ß', 'à':'à', 'á':'á', 'â':'â', 'ã':'ã', 'ä':'ä', 'å':'å', 'æ':'æ', 'ç':'ç', 'è':'è', 'é':'é', 'ê':'ê', 'ë':'ë', 'ì':'ì', 'í':'í', 'î':'î', 'ï':'ï', 'ð':'ð', 'ñ':'ñ', 'ò':'ò', 'ó':'ó', 'ô':'ô', 'õ':'õ', 'ö':'ö', '÷':'÷', 'ø':'ø', 'ù':'ù', 'ú':'ú', 'û':'û', 'ü':'ü', 'ý':'ý', 'þ':'þ', 'ÿ':'ÿ', 'ƒ':'ƒ', 'Α':'Α', 'Β':'Β', 'Γ':'Γ', 'Δ':'Δ', 'Ε':'Ε', 'Ζ':'Ζ', 'Η':'Η', 'Θ':'Θ', 'Ι':'Ι', 'Κ':'Κ', 'Λ':'Λ', 'Μ':'Μ', 'Ν':'Ν', 'Ξ':'Ξ', 'Ο':'Ο', 'Π':'Π', 'Ρ':'Ρ', 'Σ':'Σ', 'Τ':'Τ', 'Υ':'Υ', 'Φ':'Φ', 'Χ':'Χ', 'Ψ':'Ψ', 'Ω':'Ω', 'α':'α', 'β':'β', 'γ':'γ', 'δ':'δ', 'ε':'ε', 'ζ':'ζ', 'η':'η', 'θ':'θ', 'ι':'ι', 'κ':'κ', 'λ':'λ', 'μ':'μ', 'ν':'ν', 'ξ':'ξ', 'ο':'ο', 'π':'π', 'ρ':'ρ', 'ς':'ς', 'σ':'σ', 'τ':'τ', 'υ':'υ', 'φ':'φ', 'χ':'χ', 'ψ':'ψ', 'ω':'ω', 'ϑ':'ϑ', 'ϒ':'ϒ', 'ϖ':'ϖ', '•':'•', '…':'…', '′':'′', '″':'″', '‾':'‾', '⁄':'⁄', '℘':'℘', 'ℑ':'ℑ', 'ℜ':'ℜ', '™':'™', 'ℵ':'ℵ', '←':'←', '↑':'↑', '→':'→', '↓':'↓', '↔':'↔', '↵':'↵', '⇐':'⇐', '⇑':'⇑', '⇒':'⇒', '⇓':'⇓', '⇔':'⇔', '∀':'∀', '∂':'∂', '∃':'∃', '∅':'∅', '∇':'∇', '∈':'∈', '∉':'∉', '∋':'∋', '∏':'∏', '∑':'∑', '−':'−', '∗':'∗', '√':'√', '∝':'∝', '∞':'∞', '∠':'∠', '∧':'∧', '∨':'∨', '∩':'∩', '∪':'∪', '∫':'∫', '∴':'∴', '∼':'∼', '≅':'≅', '≈':'≈', '≠':'≠', '≡':'≡', '≤':'≤', '≥':'≥', '⊂':'⊂', '⊃':'⊃', '⊄':'⊄', '⊆':'⊆', '⊇':'⊇', '⊕':'⊕', '⊗':'⊗', '⊥':'⊥', '⋅':'⋅', '⌈':'⌈', '⌉':'⌉', '⌊':'⌊', '⌋':'⌋', '⟨':'〈', '⟩':'〉', '◊':'◊', '♠':'♠', '♣':'♣', '♥':'♥', '♦':'♦', '"':'"', '&':'&', '<':'<', '>':'>', 'Œ':'Œ', 'œ':'œ', 'Š':'Š', 'š':'š', 'Ÿ':'Ÿ', 'ˆ':'ˆ', '˜':'˜', ' ':' ', ' ':' ', ' ':' ', '‌':'‌', '‍':'‍', '‎':'‎', '‏':'‏', '–':'–', '—':'—', '‘':'‘', '’':'’', '‚':'‚', '“':'“', '”':'”', '„':'„', '†':'†', '‡':'‡', '‰':'‰', '‹':'‹', '›':'›', '€':'€' };
static public function convertEntities(str:String):String
{
var re:RegExp = /&\w*;/g
var entitiesFound:Array = str.match(re);
var entitiesConverted:Object = {};
var len:int = entitiesFound.length;
var oldEntity:String;
var newEntity:String;
for (var i:int = 0; i < len; i++)
{
oldEntity = entitiesFound[i];
newEntity = entityMap[oldEntity];
if (newEntity && !entitiesConverted[oldEntity])
{
str = str.split(oldEntity).join(newEntity);
entitiesConverted[oldEntity] = true;
}
}
return str;
}
Credit where credit is due: this code was optimised by an acquaintance of mine (Tim Hawkins) which was modified from the original Flash HTML Entities Suck.
You can try using the htmlText property to set your text, rather than the text property.
This should convert any html entities to there correct symbols.
The best answer posted by James Fassett is quite good but it has 4 characters that are omitted: < > " and & since the regexp is checking for strings starting with & and ending with ; these four characters are omitted. Keep that in mind that if you're trying to encode XML(containing < and > chars),for example, which should be displayed as text.
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