How to iterate counter in XSLT 1.0 based on some condition - templates

Question

I have a requirement where I have to increment the count and assign that value to one of the target element.
For ex - My input request is something like this
<Deliveries>
<Delivery>
<OrderNo>
1234
</OrderNo>
<orderItem>
12
</orderItem>
</Delivery>
<Delivery>
<OrderNo>
S1234
</OrderNo>
<orderItem>
12
</orderItem>
</Delivery>
</Deliveries>
Delivery is parent element which is unbounded and my output XSD is nothing but table columns.
<Order_table>
<Orders>
<column1>
<column2>
</Orders>
</Order_table>
Now My requirement is that If OrderNo contains first letter as S then I have to assign 1 value to column1 else I have to simply copy the value of orderItem. and every time I get the OrderNo value starting with S then I have to increment the value by 1 but if orderNo is not starting with S then it should not increase by 1. Due to this logic , I am not able to use position function as well.
For example -
If my input is something like -
<Deliveries>
<Delivery>
<OrderNo>
S1234
</OrderNo>
<orderItem>
12
</orderItem>
</Delivery>
<Delivery>
<OrderNo>
1234
</OrderNo>
<orderItem>
12
</orderItem>
</Delivery>
<Delivery>
<OrderNo>
S1234
</OrderNo>
<orderItem>
12
</orderItem>
</Delivery>
</Deliveries>
Then my output should be -
<Order_table>
<Orders>
<column1>1</column1> <-- First value as 1 as Order starts from S
<column2>
</Orders>
<Orders>
<column1>12</column1> copy of orderItem bcz orderNo don't start with S
<column2>
</Orders>
<Orders>
<column1>2</column1> Increment from 1 to 2 as Order again starts from S
<column2>
</Orders>
</Order_table>
Could any please help me with my issue ? A piece of code will help me a lot.

Answer 1

Try:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<Order_table>
<xsl:apply-templates select="//OrderNo"/>
</Order_table>
</xsl:template>
<xsl:template match="OrderNo[starts-with(normalize-space(.), 'S')]">
<Orders>
<column1>
<xsl:number level="any" count="OrderNo[starts-with(normalize-space(.), 'S')]"/>
</column1>
<column2/>
</Orders>
</xsl:template>
<xsl:template match="OrderNo">
<Orders>
<column1><xsl:value-of select="normalize-space(../orderItem)"/></column1>
<column2/>
</Orders>
</xsl:template>
</xsl:stylesheet>

Answer 2

When your context is placed at a Delivery node, test for starts-with(OrderNo,'S'), then count backward the number of siblings using the same test. This will give you your incrementing value.
<xsl:template match="Delivery">
<Orders>
<column1>
<xsl:choose>
<xsl:when test="starts-with(OrderNo,'S')">
<xsl:value-of select="1+count(preceding-sibling::Delivery[starts-with(OrderNo,'S')])"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="orderItem"/>
</xsl:otherwise>
</xsl:choose>
</column1>
<column2/>
</Orders>
</xsl:template>
You will of course, also need complete the remainder of the stylesheet yourself, but this covers the logical that you outline in your question.