RGBA to HEX String Conversion
Convert RGBA or RGB comma separated strings to hexadecimal equivalents
Description
This utility may be passed a rgba/rgb string such as 72, 94, 188, .9 and it will return the hexadecimal equivalent (in this case, 485EBC).
After importing this template into an xsl stylesheet, you would call the rgba-to-text template like so:
<xsl:call-template name="rbga-to-hex">
<xsl:with-param name="rgba-val" select="'72, 94, 188, .9'"/>
</xsl:call-template>
This would output: 485EBC
XSLT
View Raw
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:template name="rbga-to-hex">
<xsl:param name="rgba-val"/>
<xsl:param name="count" select="1"/>
<xsl:variable name="val" select="substring-before($rgba-val,',')"/>
<xsl:variable name="tail" select="substring-after($rgba-val,concat($val,','))"/>
<xsl:choose>
<xsl:when test="$count < 4">
<xsl:call-template name="to-hex">
<xsl:with-param name="val" select="$val"/>
</xsl:call-template>
<xsl:call-template name="rbga-to-hex">
<xsl:with-param name="count" select="$count + 1"/>
<xsl:with-param name="rgba-val" select="$tail"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="to-hex">
<xsl:with-param name="val" select="$val"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="to-hex">
<xsl:param name="val"/>
<xsl:param name="max" select="255"/>
<xsl:param name="min" select="0"/>
<xsl:param name="hex-key" select="'0123456789ABCDEF'"/>
<!-- REMOVE NON-NUMERIC CHARACTERS -->
<xsl:variable name="val"
select="translate($val,'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ,.-_=+!@#$%^*() ','')"/>
<!-- insure that the rgb value is within 0-255 -->
<xsl:variable name="num">
<xsl:choose>
<xsl:when test="$val > $max">
<xsl:value-of select="$max"/>
</xsl:when>
<xsl:when test="$val < $min">
<xsl:value-of select="$min"/>
</xsl:when>
<!-- insure that we have whole numbers -->
<xsl:otherwise>
<xsl:value-of select="round($val)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<!-- Return Hex Val -->
<!-- substring(string, position, length) -->
<xsl:value-of select="concat( substring($hex-key,(ceiling(($num - ceiling($num mod 16)) div 16)+1),1),
substring($hex-key,(ceiling(($num - ceiling($num mod 16)) div 16)+1),1)
)"/>
</xsl:template>
</xsl:stylesheet>