Numeric Calculation in XSL

The Functions number do transforms its argument to number. XSL stylesheet 1 demonstrates the string conversion, XSL stylesheet 2 converts the boolean values to either true and false.

XSL stylesheet 1

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<TABLE border="1">
<TR>
<TH>text</TH>
<TH>number</TH>
</TR>
<xsl:for-each select="//text">
<TR>
<TD>
<xsl:value-of select="."/>
</TD>
<TD>
<xsl:value-of select="number()"/>
</TD>
</TR>
</xsl:for-each>
</TABLE>
</xsl:template>
</xsl:stylesheet>

XSL stylesheet 2

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<TABLE border="1">
<TR>
<TH>text</TH>
<TH>number</TH>
</TR>
<xsl:for-each select="//text[text() = 'true' or text() = 'false()']">
<TR>
<TD>
<xsl:value-of select="."/>
</TD>
<TD>
<xsl:value-of select="number()"/>
</TD>
</TR>
</xsl:for-each>
</TABLE>
<P>
<xsl:text>but:</xsl:text>
</P>
<TABLE border="1">
<TR>
<TH>function</TH>
<TH>number</TH>
</TR>
<TR>
<TD>true()</TD>
<TD>
<xsl:value-of select="number(true())"/>
</TD>
</TR>
<TR>
<TD>false()</TD>
<TD>
<xsl:value-of select="number(false())"/>
</TD>
</TR>
<TR>
<TD>5>7</TD>
<TD>
<xsl:value-of select="number(5 > 7)"/>
</TD>
</TR>
<TR>
<TD>5<7</TD>
<TD>
<xsl:value-of select="number(5<7)"/>
</TD>
</TR>
</TABLE>
</xsl:template>
</xsl:stylesheet>

Arithematic Operations

The Add, subtract and multiply do use the common syntax , see the XSL stylesheet 1. The division syntax is less usual. A slash "/" symbol is used in the patterns and so the keyword div is been used instead, see the XSL stylesheet 2. The operator mod returns a remainder from truncating the division.

XML Source

<source>
<number>1</number>
<number>3</number>
<number>4</number>
<number>17</number>
<number>8</number>
<number>11</number>
</source>

Output

<P>1 + 3 = 4</P>
<P>4 - 17 = -13</P>
<P>8 * 11 = 88</P>

XSL stylesheet 1

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<P>
<xsl:value-of select="//number[1]"/>
<xsl:text> + </xsl:text>
<xsl:value-of select="//number[2]"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="//number[1] + //number[2]"/>
</P>
<P>
<xsl:value-of select="//number[3]"/>
<xsl:text> - </xsl:text>
<xsl:value-of select="//number[4]"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="//number[3] - //number[4]"/>
</P>
<P>
<xsl:value-of select="//number[5]"/>
<xsl:text> * </xsl:text>
<xsl:value-of select="//number[6]"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="//number[5] * //number[6]"/>
</P>
</xsl:template>
</xsl:stylesheet>

XML Source

<source>
<number>1</number>
<number>3</number>
<number>4</number>
<number>17</number>
<number>8</number>
<number>11</number>
</source>

Output <P>8 / 11 = 0.7272727272727273</P>
<P>8 mod 11 = 8</P>

XSL stylesheet 2

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<P>
<xsl:value-of select="//number[5]"/>
<xsl:text> / </xsl:text>
<xsl:value-of select="//number[6]"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="//number[5] div //number[6]"/>
</P>
<P>
<xsl:value-of select="//number[5]"/>
<xsl:text> mod </xsl:text>
<xsl:value-of select="//number[6]"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="//number[5] mod //number[6]"/>
</P>
</xsl:template>
</xsl:stylesheet>

Ceiling, Floor and Round

The functions ceilng(), floor() and the round() transforms a floating point numbers into an integer in a specified way.

XML Source

<source>
<number>6</number>
<number>3.8</number>
<number>1.234</number>
<number>-6</number>
<number>-3.8</number>
<number>-1.234</number>
</source>

Output

<TABLE border="1">
<TR>
<TH>number</TH>
<TH>floor</TH>
<TH>ceiling</TH>
<TH>round</TH>
</TR>
<TR>
<TD>6</TD>
<TD>6</TD>
<TD>6</TD>
<TD>6</TD>
</TR>
<TR>
<TD>3.8</TD>
<TD>3</TD>
<TD>4</TD>
<TD>4</TD>
</TR>
<TR>
<TD>1.234</TD>
<TD>1</TD>
<TD>2</TD>
<TD>1</TD>
</TR>
<TR>
<TD>-6</TD>
<TD>-6</TD>
<TD>-6</TD>
<TD>-6</TD>
</TR>
<TR>
<TD>-3.8</TD>
<TD>-4</TD>
<TD>-3 </TR>
<TR>
<TD>-1.234</TD>
<TD>-2</TD>
<TD>-1</TD>
<TD>-1</TD>
</TR>
</TABLE>

XSL stylesheet

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:template match="/">
<TABLE border="1">
<TR>
<TH>number</TH>
<TH>floor</TH>
<TH>ceiling</TH>
<TH>round</TH>
</TR>
<xsl:for-each select="//number">
<TR>
<TD>
<xsl:value-of select="."/>
</TD>
<TD>
<xsl:value-of select="floor(.)"/>
</TD>
<TD>
<xsl:value-of select="ceiling(.)"/>
</TD>
<TD>
<xsl:value-of select="round(.)"/>
</TD>
</TR>
</xsl:for-each>
</TABLE>
</xsl:template>
</xsl:stylesheet>

String Function

The Function string() transforms all its argument into the string. This function is not been used directly usualy in the stylesheets since it is in most of the cases been called by default. The XSL stylesheet 1 shows examples of the numbers to string conversions. Notice the results of a zero divisions.

XML Source

<source>
<number>9</number>
<number>0</number>
<number>-9</number>
<number/>
</source>

Output

<P>9</P>
<P>NaN</P>
<P>9/0 = Infinity</P>
<P>-9/0 = -Infinity</P>
<P>0/0 = NaN</P>

XSL stylesheet

<xsl:stylesheet version = '1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:variable name="A" select="number(//number[1])"/>
<xsl:variable name="B" select="number(//number[2])"/>
<xsl:variable name="C" select="number(//number[3])"/>
<xsl:variable name="D" select="number(//number[4])"/>
<xsl:template match="/">
<P>
<xsl:value-of select="string(number($A))"/>
</P>
<P>
<xsl:value-of select="string(number($D))"/>
</P>
<P>
<xsl:value-of select="$A"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="$B"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="string($A div $B)"/>
</P>
<P>
<xsl:value-of select="$C"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="$B"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="string($C div $B)"/>
</P>
<P>
<xsl:value-of select="$B"/>
<xsl:text>/</xsl:text>
<xsl:value-of select="$B"/>
<xsl:text> = </xsl:text>
<xsl:value-of select="$B div $B"/>
</P>
</xsl:template>
</xsl:stylesheet>

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