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COPYRIGHT (c) 2006 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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"{ Package: 'stx:libbasic' }"
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"{ NameSpace: CharacterEncoderImplementations }"
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ISO10646_to_UTF8 subclass:#ISO10646_to_XMLUTF8
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instanceVariableNames:''
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classVariableNames:'ReplacementCharacter'
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poolDictionaries:''
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category:'Collections-Text-Encodings'
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!
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!ISO10646_to_XMLUTF8 class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2006 by eXept Software AG
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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!
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documentation
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"
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This encoder encodes characters into utf8 characters that may
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occur in XML document.
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Not all UTF characters are valid in XML, whatever encoding
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is used. For a reference, see
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http://www.w3.org/TR/2000/REC-xml-20001006#NT-Char
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Invalid characters are replaced by ReplacementCharacter
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with $? as default.
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[author:]
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Jan Vrany <jan.vrany@fit.cvut.cz>
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[instance variables:]
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[class variables:]
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[see also:]
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http://www.w3.org/TR/2000/REC-xml-20001006#NT-Char
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"
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! !
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!ISO10646_to_XMLUTF8 class methodsFor:'initialization'!
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initialize
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"Invoked at system start or when the class is dynamically loaded."
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ReplacementCharacter := $?.
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"Modified: / 30-06-2012 / 19:55:00 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!ISO10646_to_XMLUTF8 methodsFor:'encoding & decoding'!
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encodeString:aUnicodeString
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"return the UTF-8 representation of a aUnicodeString.
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The resulting string contains only valid XML unicode
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characters. Invalid characters are replaced by a
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ReplacementCharacter. For details, please see
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http://www.w3.org/TR/2000/REC-xml-20001006#NT-Char
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"
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|s|
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"Copy-paste of superclass's method and tweaked. Not ideal, but
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but avoids 1 string copy"
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s := WriteStream on:(String uninitializedNew:aUnicodeString size).
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aUnicodeString do:[:eachCharacter |
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|codePoint b1 b2 b3 b4 b5 v "{Class: SmallInteger }"|
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codePoint := eachCharacter codePoint.
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(self isValidXMLunicode: codePoint) ifFalse:[
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codePoint := ReplacementCharacter codePoint.
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].
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codePoint <= 16r7F ifTrue:[
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s nextPut:eachCharacter.
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] ifFalse:[
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b1 := Character value:((codePoint bitAnd:16r3F) bitOr:2r10000000).
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v := codePoint bitShift:-6.
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v <= 16r1F ifTrue:[
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s nextPut:(Character value:(v bitOr:2r11000000)).
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s nextPut:b1.
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] ifFalse:[
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b2 := Character value:((v bitAnd:16r3F) bitOr:2r10000000).
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v := v bitShift:-6.
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v <= 16r0F ifTrue:[
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s nextPut:(Character value:(v bitOr:2r11100000)).
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s nextPut:b2; nextPut:b1.
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] ifFalse:[
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b3 := Character value:((v bitAnd:16r3F) bitOr:2r10000000).
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v := v bitShift:-6.
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v <= 16r07 ifTrue:[
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s nextPut:(Character value:(v bitOr:2r11110000)).
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s nextPut:b3; nextPut:b2; nextPut:b1.
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] ifFalse:[
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b4 := Character value:((v bitAnd:16r3F) bitOr:2r10000000).
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v := v bitShift:-6.
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v <= 16r03 ifTrue:[
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s nextPut:(Character value:(v bitOr:2r11111000)).
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s nextPut:b4; nextPut:b3; nextPut:b2; nextPut:b1.
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] ifFalse:[
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b5 := Character value:((v bitAnd:16r3F) bitOr:2r10000000).
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v := v bitShift:-6.
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v <= 16r01 ifTrue:[
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s nextPut:(Character value:(v bitOr:2r11111100)).
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s nextPut:b5; nextPut:b4; nextPut:b3; nextPut:b2; nextPut:b1.
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] ifFalse:[
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"/ cannot happen - we only support up to 30 bit characters
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self error:'ascii value > 31bit in utf8Encode'.
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]
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].
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].
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].
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].
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].
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].
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^ s contents
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"
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(self encodeString:'hello') asByteArray #[104 101 108 108 111]
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(self encodeString:(Character value:16r40) asString) asByteArray #[64]
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(self encodeString:(Character value:16r7F) asString) asByteArray #[127]
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(self encodeString:(Character value:16r80) asString) asByteArray #[194 128]
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(self encodeString:(Character value:16rFF) asString) asByteArray #[195 191]
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(self encodeString:(Character value:16r100) asString) asByteArray #[196 128]
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(self encodeString:(Character value:16r200) asString) asByteArray #[200 128]
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(self encodeString:(Character value:16r400) asString) asByteArray #[208 128]
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(self encodeString:(Character value:16r800) asString) asByteArray #[224 160 128]
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(self encodeString:(Character value:16r1000) asString) asByteArray #[225 128 128]
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(self encodeString:(Character value:16r2000) asString) asByteArray #[226 128 128]
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(self encodeString:(Character value:16r4000) asString) asByteArray #[228 128 128]
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(self encodeString:(Character value:16r8000) asString) asByteArray #[232 128 128]
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(self encodeString:(Character value:16rFFFF) asString) asByteArray #[239 191 191]
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"
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"Created: / 30-06-2012 / 20:07:43 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!ISO10646_to_XMLUTF8 methodsFor:'queries'!
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isValidXMLunicode: codePoint
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"Returns true, if given codePoint (Integer!!!!!!) is
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valid XML unicode."
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codePoint == 16r0009 ifTrue:[ ^ true ].
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codePoint == 16r000A ifTrue:[ ^ true ].
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codePoint == 16r000D ifTrue:[ ^ true ].
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(codePoint between: 16r0020 and: 16rD7FF ) ifTrue:[ ^ true ].
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(codePoint between: 16rE000 and: 16rFFFD ) ifTrue:[ ^ true ].
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(codePoint between: 16r10000 and: 16r10FFFF) ifTrue:[ ^ true ].
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^false.
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"Created: / 30-06-2012 / 20:11:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!ISO10646_to_XMLUTF8 class methodsFor:'documentation'!
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version_SVN
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^ '$Id:: $'
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! !
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ISO10646_to_XMLUTF8 initialize!
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