使用fn:随机数生成器多次生成随机数
使用fn:随机数生成器多次生成随机数
提问于 2019-04-24 22:41:14
我尝试编写一个简单的函数，以便在每次调用它时为我提供一个随机字母，但我很难将我的想法与函数式编程方法的概念结合起来。在此过程中提供一些帮助，我们将不胜感激！我的代码看起来像这样：
<xd:doc>
<xd:desc>Provides one random letter, if the type is provided it returns a letter of thet type</xd:desc>
<xd:param name="type">The type of letter to return, one of (A,a,B,b)</xd:param>
</xd:doc>
<xsl:function name="gdpr:randomLetter" as="xs:string">
<xsl:param name="type" as="xs:string"></xsl:param>
<xsl:choose>
<xsl:when test="$type = 'A'">
<xsl:variable name="randomNumber" select="random-number-generator()['next']?permute(1 to 7)[1]"/>
<xsl:variable name="letters" select="('A','O','U','E','I','Y','Q')"/>
<xsl:value-of select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'a'">
<xsl:variable name="randomNumber" select="random-number-generator()['next']?permute(1 to 7)[1]"/>
<xsl:variable name="letters" select="('a','o','u','e','i','y','q')"/>
<xsl:value-of select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'B'">
<xsl:variable name="randomNumber" select="random-number-generator()['next']?permute(1 to 19)[1]"/>
<xsl:variable name="letters" select="('W','R','T','P','S','D','F','G','H','J','K','L','M','N','B','V','C','X','Z')"/>
<xsl:value-of select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'b'">
<xsl:variable name="randomNumber" select="random-number-generator()['next']?permute(1 to 19)[1]"/>
<xsl:variable name="letters" select="('w','r','t','p','s','d','f','g','h','j','k','l','m','n','b','v','c','x','z')"/>
<xsl:value-of select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="randomNumber" select="random-number-generator()['next']?permute(1 to 52)[1]"/>
<xsl:variable name="letters" select="('A','O','U','E','I','Y','Q','a','o','u','e','i','y','q','w','r','t','p','s','d','f','g','h','j','k','l','m','n','b','v','c','x','z','W','R','T','P','S','D','F','G','H','J','K','L','M','N','B','V','C','X','Z')"/>
<xsl:value-of select="$letters[$randomNumber]"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>回答 1
Stack Overflow用户
发布于 2019-04-25 03:37:40
在XSLT3的上下文中，我认为为需要的每个节点都有一个“新的”random-number-generator的一种方法是定义一个累加器：
<xsl:accumulator name="rng" as="map(xs:string, item())" initial-value="random-number-generator(current-dateTime())">
<xsl:accumulator-rule match="foo[@type]" select="$value?next()"/>
</xsl:accumulator>因此，您可以将函数实现为
<xsl:function name="gdpr:randomLetter" as="item()*">
<xsl:param name="type" as="xs:string"/>
<xsl:param name="rng" as="map(xs:string, item())"/>
<xsl:choose>
<xsl:when test="$type = 'A'">
<xsl:variable name="randomNumber" select="$rng?permute(1 to 7)[1]"/>
<xsl:variable name="letters" select="('A','O','U','E','I','Y','Q')"/>
<xsl:sequence select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'a'">
<xsl:variable name="randomNumber" select="$rng?permute(1 to 7)[1]"/>
<xsl:variable name="letters" select="('a','o','u','e','i','y','q')"/>
<xsl:sequence select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'B'">
<xsl:variable name="randomNumber" select="$rng?permute(1 to 19)[1]"/>
<xsl:variable name="letters" select="('W','R','T','P','S','D','F','G','H','J','K','L','M','N','B','V','C','X','Z')"/>
<xsl:sequence select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:when test="$type = 'b'">
<xsl:variable name="randomNumber" select="$rng?permute(1 to 19)[1]"/>
<xsl:variable name="letters" select="('w','r','t','p','s','d','f','g','h','j','k','l','m','n','b','v','c','x','z')"/>
<xsl:sequence select="$letters[$randomNumber]"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="randomNumber" select="$rng?permute(1 to 52)[1]"/>
<xsl:variable name="letters" select="('A','O','U','E','I','Y','Q','a','o','u','e','i','y','q','w','r','t','p','s','d','f','g','h','j','k','l','m','n','b','v','c','x','z','W','R','T','P','S','D','F','G','H','J','K','L','M','N','B','V','C','X','Z')"/>
<xsl:sequence select="$letters[$randomNumber]"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>然后用例如
<xsl:template match="foo[@type]">
<xsl:copy>
<xsl:value-of select="gdpr:randomLetter(@type, accumulator-before('rng'))"/>
</xsl:copy>
</xsl:template>并确保您使用
<xsl:mode on-no-match="shallow-copy" use-accumulators="rng"/>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55832760
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