Subject: Re: [xsl] Recursive string replace in XSLT 2.0 From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Fri, 6 Jan 2017 21:40:31 -0000 |
not here <xsl:param name="regexes" as="element(regex)*"> Michael meant here, in the template definition <xsl:param name="regex"/> You could declare your top level initialiser to also be a sequence of elements but then your initial call would have to be <xsl:with-param name="regex" select="$regexes"/> not <xsl:with-param name="regex" select="$regexes/regex"/> David On 6 January 2017 at 21:37, Rick Quatro rick@xxxxxxxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Thank you Michael. Oddly enough, when I add the as="element(regex)*" the > finds/changes fail. Here is the entire stylesheet: > > <?xml version="1.0" encoding="UTF-8"?> > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > xmlns:xs="http://www.w3.org/2001/XMLSchema" > exclude-result-prefixes="xs" > version="2.0"> > > <xsl:output indent="yes"/> > > <xsl:param name="regexes" as="element(regex)*"> > <regex><find>"(\S)</find><change>“$1</change></regex> > <regex><find>(\S)"</find><change>$1”</change></regex> > </xsl:param> > > <xsl:template match="/"> > <xsl:apply-templates/> > </xsl:template> > > <xsl:template match="p"> > <p><xsl:apply-templates/></p> > </xsl:template> > > <xsl:template match="text()[string-length(normalize-space(.))>0]"> > <xsl:call-template name="applyRegexes"> > <xsl:with-param name="nodeText" select="."/> > <xsl:with-param name="regex" select="$regexes/regex"/> > </xsl:call-template> > </xsl:template> > > <xsl:template name="applyRegexes"> > <xsl:param name="nodeText"/> > <xsl:param name="regex"/> > <xsl:choose> > <xsl:when test="$regex"> > <xsl:variable name="temp"> > <xsl:value-of > select="replace($nodeText,$regex[1]/find,$regex[1]/change)"/> > </xsl:variable> > <xsl:call-template name="applyRegexes"> > <xsl:with-param name="nodeText" select="$temp"/> > <xsl:with-param name="regex" > select="$regex[position()>1]"/> > </xsl:call-template> > </xsl:when> > <xsl:otherwise> > <xsl:value-of select="$nodeText"/> > </xsl:otherwise> > </xsl:choose> > </xsl:template> > > </xsl:stylesheet> > > Here is my input: > > <?xml version='1.0' encoding='UTF-8'?> > <root> > <test><p class="Note">"Abcdefghij."</p></test> > <test><p class="Note">"defghij."</p></test> > </root> > > Without the as attribute, the finds/changes are applied, but with it, they > don't. Thanks. > > --Rick > > > -----Original Message----- > From: Michael Kay mike@xxxxxxxxxxxx > [mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx] > Sent: Friday, January 06, 2017 4:25 PM > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx > Subject: Re: [xsl] Recursive string replace in XSLT 2.0 > > If you don't like head-tail recursion for this kind of problem, there are a > couple of alternatives you might consider. > > One is xsl:iterate, which looks something like this: > > <xsl:iterate select="$list-of-replacements"> > <xsl:param name="str" as="xs:string"/> > <xsl:on-completion select="$str"/> > <xsl:next-iteration> > <xsl:with-param name="str" select="replace($str, find, change)"/> > </xsl:next-iteration> > </xsl:iterate> > > The other is fold-left: > > fold-left($list-of-replacements, $str, function($str, $regex) { > replace($str, $regex/find, $regex/change) } ) > > Both these require 3.0. > > Michael Kay > Saxonica > > > > On 6 Jan 2017, at 19:41, David Carlisle d.p.carlisle@xxxxxxxxx > <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > I'd have written it as a function rather than template, but the main > > issue is you want your parameter to be (always) a sequence of elements > > not sometimes a sequence of elements and sometimes a document node > > with a sequence of child elements. > > > > <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet > > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > > xmlns:xs="http://www.w3.org/2001/XMLSchema" > > exclude-result-prefixes="xs" > > version="2.0"> > > > > <xsl:output indent="yes"/> > > > > <xsl:param name="regexes"> > > <regex><find>a</find><change>x</change></regex> > > <regex><find>b</find><change>y</change></regex> > > <regex><find>c</find><change>z</change></regex> > > </xsl:param> > > > > <xsl:template match="/"> > > <xsl:apply-templates/> > > </xsl:template> > > > > <xsl:template match="p"> > > <p><xsl:apply-templates/></p> > > </xsl:template> > > > > <xsl:template match="text()"><!--[string-length(.)>0]--> > > <xsl:message select="."></xsl:message> > > <xsl:call-template name="applyRegexes"> > > <xsl:with-param name="nodeText" select="."/> > > <xsl:with-param name="regex" select="$regexes/regex"/> > > </xsl:call-template> > > </xsl:template> > > > > <xsl:template name="applyRegexes"> > > <xsl:param name="nodeText"/> > > <xsl:param name="regex"/> > > <xsl:message select="$regex"></xsl:message> > > <xsl:message select="$regex[1]"/> > > <xsl:message select="$regex[position()>1]"/> > > <xsl:choose> > > <xsl:when test="$regex"> > > <xsl:call-template name="applyRegexes"> > > <xsl:with-param name="nodeText" > > select="replace($nodeText,$regex[1]/find,$regex[1]/change)"/> > > <xsl:with-param name="regex" > > select="$regex[position()>1]"/> > > </xsl:call-template> > > </xsl:when> > > <xsl:otherwise> > > <xsl:value-of select="$nodeText"/> > > </xsl:otherwise> > > </xsl:choose> > > </xsl:template> > > > > </xsl:stylesheet>
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