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This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues.
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{{task|XML}}
Perform the following three XPath queries on the XML Document below:
- Retrieve the first "item" element
- Perform an action on each "price" element (print it out)
- Get an array of all the "name" elements
XML Document:
ARM Assembly
{{works with|as|Raspberry Pi}}
/* ARM assembly Raspberry PI */
/* program xpathXml.s */
/* Constantes */
.equ STDOUT, 1 @ Linux output console
.equ EXIT, 1 @ Linux syscall
.equ WRITE, 4 @ Linux syscall
.equ NBMAXELEMENTS, 100
/*******************************************/
/* Structures */
/********************************************/
/* structure xmlNode*/
.struct 0
xmlNode_private: @ application data
.struct xmlNode_private + 4
xmlNode_type: @ type number, must be second !
.struct xmlNode_type + 4
xmlNode_name: @ the name of the node, or the entity
.struct xmlNode_name + 4
xmlNode_children: @ parent->childs link
.struct xmlNode_children + 4
xmlNode_last: @ last child link
.struct xmlNode_last + 4
xmlNode_parent: @ child->parent link
.struct xmlNode_parent + 4
xmlNode_next: @ next sibling link
.struct xmlNode_next + 4
xmlNode_prev: @ previous sibling link
.struct xmlNode_prev + 4
xmlNode_doc: @ the containing document
.struct xmlNode_doc + 4
xmlNode_ns: @ pointer to the associated namespace
.struct xmlNode_ns + 4
xmlNode_content: @ the content
.struct xmlNode_content + 4
xmlNode_properties: @ properties list
.struct xmlNode_properties + 4
xmlNode_nsDef: @ namespace definitions on this node
.struct xmlNode_nsDef + 4
xmlNode_psvi: @ for type/PSVI informations
.struct xmlNode_psvi + 4
xmlNode_line: @ line number
.struct xmlNode_line + 4
xmlNode_extra: @ extra data for XPath/XSLT
.struct xmlNode_extra + 4
xmlNode_fin:
/********************************************/
/* structure xmlNodeSet*/
.struct 0
xmlNodeSet_nodeNr: @ number of nodes in the set
.struct xmlNodeSet_nodeNr + 4
xmlNodeSet_nodeMax: @ size of the array as allocated
.struct xmlNodeSet_nodeMax + 4
xmlNodeSet_nodeTab: @ array of nodes in no particular order
.struct xmlNodeSet_nodeTab + 4
xmlNodeSet_fin:
/********************************************/
/* structure xmlXPathObject*/
.struct 0
xmlPathObj_type: @
.struct xmlPathObj_type + 4
xmlPathObj_nodesetval: @
.struct xmlPathObj_nodesetval + 4
xmlPathObj_boolval: @
.struct xmlPathObj_boolval + 4
xmlPathObj_floatval: @
.struct xmlPathObj_floatval + 4
xmlPathObj_stringval: @
.struct xmlPathObj_stringval + 4
xmlPathObj_user: @
.struct xmlPathObj_user + 4
xmlPathObj_index: @
.struct xmlPathObj_index + 4
xmlPathObj_user2: @
.struct xmlPathObj_user2 + 4
xmlPathObj_index2: @
.struct xmlPathObj_index2 + 4
/*********************************/
/* Initialized data */
/*********************************/
.data
szMessEndpgm: .asciz "\nNormal end of program.\n"
szMessDisVal: .asciz "\nDisplay set values.\n"
szMessDisArea: .asciz "\nDisplay area values.\n"
szFileName: .asciz "testXml.xml"
szMessError: .asciz "Error detected !!!!. \n"
szLibName: .asciz "name"
szLibPrice: .asciz "//price"
szLibExtName: .asciz "//name"
szCarriageReturn: .asciz "\n"
/*********************************/
/* UnInitialized data */
/*********************************/
.bss
.align 4
tbExtract: .skip 4 * NBMAXELEMENTS @ result extract area
/*********************************/
/* code section */
/*********************************/
.text
.global main
main: @ entry of program
ldr r0,iAdrszFileName
bl xmlParseFile @ create doc
mov r9,r0 @ doc address
mov r0,r9 @ doc
bl xmlDocGetRootElement @ get root
bl xmlFirstElementChild @ get first section
bl xmlFirstElementChild @ get first item
bl xmlFirstElementChild @ get first name
bl xmlNodeGetContent @ extract content
bl affichageMess @ for display
ldr r0,iAdrszCarriageReturn
bl affichageMess
ldr r0,iAdrszMessDisVal
bl affichageMess
mov r0,r9
ldr r1,iAdrszLibPrice @ extract prices
bl extractValue
mov r0,r9
ldr r1,iAdrszLibExtName @ extact names
bl extractValue
ldr r0,iAdrszMessDisArea
bl affichageMess
mov r4,#0 @ display string result area
ldr r5,iAdrtbExtract
1:
ldr r0,[r5,r4,lsl #2]
cmp r0,#0
beq 2f
bl affichageMess
ldr r0,iAdrszCarriageReturn
bl affichageMess
add r4,#1
b 1b
2:
mov r0,r9
bl xmlFreeDoc
bl xmlCleanupParser
ldr r0,iAdrszMessEndpgm
bl affichageMess
b 100f
99:
@ error
ldr r0,iAdrszMessError
bl affichageMess
100: @ standard end of the program
mov r0, #0 @ return code
mov r7, #EXIT @ request to exit program
svc #0 @ perform the system call
iAdrszMessError: .int szMessError
iAdrszMessEndpgm: .int szMessEndpgm
iAdrszLibName: .int szLibName
iAdrszLibPrice: .int szLibPrice
iAdrszCarriageReturn: .int szCarriageReturn
iAdrszFileName: .int szFileName
iAdrszLibExtName: .int szLibExtName
iAdrtbExtract: .int tbExtract
iAdrszMessDisVal: .int szMessDisVal
iAdrszMessDisArea: .int szMessDisArea
/******************************************************************/
/* extravt value of set */
/******************************************************************/
/* r0 contains the doc address
/* r1 contains the address of the libel to extract */
extractValue:
push {r1-r10,lr} @ save registres
mov r4,r1 @ save address libel
mov r9,r0 @ save doc
ldr r8,iAdrtbExtract
bl xmlXPathNewContext @ create context
mov r10,r0
mov r1,r0
mov r0,r4
bl xmlXPathEvalExpression
mov r5,r0
mov r0,r10
bl xmlXPathFreeContext @ free context
cmp r5,#0
beq 100f
ldr r4,[r5,#xmlPathObj_nodesetval] @ values set
ldr r6,[r4,#xmlNodeSet_nodeNr] @ set size
mov r7,#0 @ index
ldr r4,[r4,#xmlNodeSet_nodeTab] @ area of nods
1: @ start loop
ldr r3,[r4,r7,lsl #2] @ load node
mov r0,r9
ldr r1,[r3,#xmlNode_children] @ load string value
mov r2,#1
bl xmlNodeListGetString
str r0,[r8,r7,lsl #2] @ store string pointer in area
bl affichageMess @ and display string result
ldr r0,iAdrszCarriageReturn
bl affichageMess
add r7,#1
cmp r7,r6
blt 1b
100:
pop {r1-r10,lr} @ restaur registers */
bx lr @ return
/******************************************************************/
/* display text with size calculation */
/******************************************************************/
/* r0 contains the address of the message */
affichageMess:
push {r0,r1,r2,r7,lr} @ save registres
mov r2,#0 @ counter length
1: @ loop length calculation
ldrb r1,[r0,r2] @ read octet start position + index
cmp r1,#0 @ if 0 its over
addne r2,r2,#1 @ else add 1 in the length
bne 1b @ and loop
@ so here r2 contains the length of the message
mov r1,r0 @ address message in r1
mov r0,#STDOUT @ code to write to the standard output Linux
mov r7, #WRITE @ code call system "write"
svc #0 @ call systeme
pop {r0,r1,r2,r7,lr} @ restaur registers */
bx lr @ return
{{output}}
Invisibility Cream
Display set values.
14.50
23.99
4.95
3.56
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Display area values.
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Normal end of program.
AutoHotkey
With regular expressions
FileRead, inventory, xmlfile.xml
RegExMatch(inventory, "<item.*?</item>", item1)
MsgBox % item1
pos = 1
While, pos := RegExMatch(inventory, "<price>(.*?)</price>", price, pos + 1)
MsgBox % price1
While, pos := RegExMatch(inventory, "<name>.*?</name>", name, pos + 1)
names .= name . "`n"
MsgBox % names
{{libheader|AHK XPath}}
#Include xpath.ahk
xpath_load(doc, "xmlfile.xml")
; Retrieve the first "item" element
MsgBox % xpath(doc, "/inventory/section[1]/item[1]/text()")
; Perform an action on each "price" element (print it out)
prices := xpath(doc, "/inventory/section/item/price/text()")
Loop, Parse, prices,`,
reordered .= A_LoopField "`n"
MsgBox % reordered
; Get an array of all the "name" elements
MsgBox % xpath(doc, "/inventory/section/item/name")
AppleScript
'''Using System Events'''
''AppleScript has no-built in support for XPath, but it could be used via a 'do shell script' command. Here's a solution using Apple System Events.
set theXMLdata to "<inventory title=\"OmniCorp Store #45x10^3\"> <section name=\"health\"> <item upc=\"123456789\" stock=\"12\"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc=\"445322344\" stock=\"18\"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name=\"food\"> <item upc=\"485672034\" stock=\"653\"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc=\"132957764\" stock=\"44\"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory>" on getElementValuesByName(theXML, theNameToFind) set R to {} tell application "System Events" repeat with i in theXML set {theName, theElements} to {i's name, i's XML elements} if (count of theElements) > 0 then set R to R & my getElementValuesByName(theElements, theNameToFind) if theName = theNameToFind then set R to R & i's value end repeat end tell return R end getElementValuesByName on getBlock(theXML, theItem, theInstance) set text item delimiters to "" repeat with i from 1 to theInstance set {R, blockStart, blockEnd} to {{}, "<" & theItem & space, "</" & theItem & ">"} set x to offset of blockStart in theXML if x = 0 then exit repeat set y to offset of blockEnd in (characters x thru -1 of theXML as string) if y = 0 then exit repeat set R to characters x thru (x + y + (length of blockEnd) - 2) of theXML as string set theXML to characters (y + (length of blockEnd)) thru -1 of theXML as string end repeat return R end getBlock tell application "System Events" set xmlData to make new XML data with properties {name:"xmldata", text:theXMLdata} return my getBlock(xmlData's text, "item", 1) -- Solution to part 1 of problem. return my getElementValuesByName(xmlData's contents, "name") -- Solution to part 2 of problem. return my getElementValuesByName(xmlData's contents, "price") -- Solution to part 3 of problem. end tell
Output for the three results (respectively):
"<item upc=\"123456789\" stock=\"12\"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item>" {"Invisibility Cream", "Levitation Salve", "Blork and Freen Instameal", "Grob winglets"} {"14.50", "23.99", "4.95", "3.56"}
Bracmat
{Retrieve the first "item" element}
( nestML$(get$("doc.xml",X,ML))
: ?
( inventory
. ?,? (section.?,? ((item.?):?item) ?) ?
)
?
& out$(toML$!item)
)
{Perform an action on each "price" element (print it out)}
( nestML$(get$("doc.xml",X,ML))
: ?
( inventory
. ?
, ?
( section
. ?
, ?
( item
. ?
, ?
( price
. ?
, ?price
& out$!price
& ~
)
?
)
?
)
?
)
?
|
)
{Get an array of all the "name" elements}
( :?anArray
& nestML$(get$("doc.xml",X,ML))
: ?
( inventory
. ?
, ?
( section
. ?
, ?
( item
. ?
, ?
( name
. ?
, ?name
& !anArray !name:?anArray
& ~
)
?
)
?
)
?
)
?
| out$!anArray {Not truly an array, but a list.}
);
C
{{libheader|LibXML}} Takes XML document and XPath expression as inputs and prints results, usage is printed if invoked incorrectly.
#include <libxml/parser.h> #include <libxml/xpath.h> xmlDocPtr getdoc (char *docname) { xmlDocPtr doc; doc = xmlParseFile(docname); return doc; } xmlXPathObjectPtr getnodeset (xmlDocPtr doc, xmlChar *xpath){ xmlXPathContextPtr context; xmlXPathObjectPtr result; context = xmlXPathNewContext(doc); result = xmlXPathEvalExpression(xpath, context); xmlXPathFreeContext(context); return result; } int main(int argc, char **argv) { if (argc <= 2) { printf("Usage: %s <XML Document Name> <XPath expression>\n", argv[0]); return 0; } char *docname; xmlDocPtr doc; xmlChar *xpath = (xmlChar*) argv[2]; xmlNodeSetPtr nodeset; xmlXPathObjectPtr result; int i; xmlChar *keyword; docname = argv[1]; doc = getdoc(docname); result = getnodeset (doc, xpath); if (result) { nodeset = result->nodesetval; for (i=0; i < nodeset->nodeNr; i++) { xmlNodePtr titleNode = nodeset->nodeTab[i]; keyword = xmlNodeListGetString(doc, titleNode->xmlChildrenNode, 1); printf("Value %d: %s\n",i+1, keyword); xmlFree(keyword); } xmlXPathFreeObject (result); } xmlFreeDoc(doc); xmlCleanupParser(); return 0; }
testXML.xml contains the XML mentioned in the task description. Code must be compiled with the correct flags.
C:\rosettaCode>xPather.exe testXML.xml //price
Value 1: 14.50
Value 2: 23.99
Value 3: 4.95
Value 4: 3.56
C:\rosettaCode>xPather.exe testXML.xml //name
Value 1: Invisibility Cream
Value 2: Levitation Salve
Value 3: Blork and Freen Instameal
Value 4: Grob winglets
C#
XmlReader XReader; // Either read the xml from a string ... XReader = XmlReader.Create(new StringReader("<inventory title=... </inventory>")); // ... or read it from the file system. XReader = XmlReader.Create("xmlfile.xml"); // Create a XPathDocument object (which implements the IXPathNavigable interface) // which is optimized for XPath operation. (very fast). IXPathNavigable XDocument = new XPathDocument(XReader); // Create a Navigator to navigate through the document. XPathNavigator Nav = XDocument.CreateNavigator(); Nav = Nav.SelectSingleNode("//item"); // Move to the first element of the selection. (if available). if(Nav.MoveToFirst()) { Console.WriteLine(Nav.OuterXml); // The outer xml of the first item element. } // Get an iterator to loop over multiple selected nodes. XPathNodeIterator Iterator = XDocument.CreateNavigator().Select("//price"); while (Iterator.MoveNext()) { Console.WriteLine(Iterator.Current.Value); } Iterator = XDocument.CreateNavigator().Select("//name"); // Use a generic list. List<string> NodesValues = new List<string>(); while (Iterator.MoveNext()) { NodesValues.Add(Iterator.Current.Value); } // Convert the generic list to an array and output the count of items. Console.WriteLine(NodesValues.ToArray().Length);
C++
{{improve|C++|Does not use XPath}}
#include <vector> #include <string> #include <iostream> #include <boost/regex.hpp> #include <algorithm> #include <iterator> int main( ) { const std::string xmltext( "<inventory title=\"OmniCorp Store #45x10^3\">" "<section name=\"health\">" "<item upc=\"123456789\" stock=\"12\">" "<name>Invisibility Cream</name>" "<price>14.50</price>" "<description>Makes you invisible</description>" "</item>" "<item upc=\"445322344\" stock=\"18\">" "<name>Levitation Salve</name>" "<price>23.99</price>" "<description>Levitate yourself for up to 3 hours per application</description>" "</item>" "</section>" "<section name=\"food\">" "<item upc=\"485672034\" stock=\"653\">" "<name>Blork and Freen Instameal</name>" "<price>4.95</price>" "<description>A tasty meal in a tablet; just add water</description>" "</item>" "<item upc=\"132957764\" stock=\"44\">" "<name>Grob winglets</name>" "<price>3.56</price>" "<description>Tender winglets of Grob. Just add water</description>" "</item>" "</section>" "</inventory>" ) ; std::string::size_type found = xmltext.find( "<item" , 0 ) ; //beginning of first item std::string::size_type foundnext = xmltext.find( "</item>" , found + 5 ) ; //and its end std::cout << "The first item is\n" << xmltext.substr( found + 5 , foundnext - ( found + 5 ) ) << '\n' ; std::string::const_iterator start , end ; start = xmltext.begin( ) ; end = xmltext.end( ) ; boost::match_results<std::string::const_iterator> what ; boost::regex pricefind( "<price>(\\d+\\.?\\d+)</price>" ) ;//this regex finds the prices start = xmltext.begin( ) ; std::cout << "The prices are:\n" ; while ( boost::regex_search( start , end , what , pricefind ) ) { std::string price( what[ 1 ].first , what[ 1 ].second ) ;//find the first price std::cout << price << std::endl ; start = what[ 1 ].second ; //continue search after first price found } start = xmltext.begin( ) ; std::vector<std::string> names ; boost::regex namefind( "<name>(.+?)</name>" ) ; //find characters, be greedy! while ( boost::regex_search ( start , end , what , namefind ) ) { std::string name ( what[ 1 ].first , what[ 1 ].second ) ; names.push_back( name ) ; start = what[ 1 ].second ; } std::cout << "The following name elements were found in the xml string:\n" ; std::copy( names.begin( ) , names.end( ) , std::ostream_iterator<std::string>( std::cout , "\n" )) ; return 0 ; }
=={{header|Caché ObjectScript}}==
Class XML.Inventory [ Abstract ]
{
XData XMLData
{
<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
}
ClassMethod QueryXMLDoc(Output names As %List) As %Status
{
// get xml stream from the 'XData' block contained in this class
Set xdata=##class(%Dictionary.CompiledXData).%OpenId($this_"||XMLData",, .sc)
If $$$ISERR(sc) Quit sc
Set sc=##class(%XML.XPATH.Document).CreateFromStream(xdata.Data, .xdoc)
If $$$ISERR(sc) Quit sc
// retrieve the first 'item' element
Set sc=xdoc.EvaluateExpression("//section[1]", "item[1]", .res)
// perform an action on each 'price' element (print it out)
Set sc=xdoc.EvaluateExpression("//price", "text()", .res)
If $$$ISERR(sc) Quit sc
For i=1:1:res.Count() {
If i>1 Write ", "
Write res.GetAt(i).Value
}
// get an array of all the 'name' elements
Set sc=xdoc.EvaluateExpression("//item", "name", .res)
If $$$ISERR(sc) Quit sc
Set key=""
Do {
Set dom=res.GetNext(.key)
If '$IsObject(dom) Quit
While dom.Read() {
If dom.HasValue Set $List(names, key)=dom.Value
}
} While key'=""
// finished
Quit $$$OK
}
}
{{out|Examples}}
USER>Do ##class(XML.Inventory).QueryXMLDoc(.list)
14.50, 23.99, 4.95, 3.56
USER>Write $ListToString(list, ", ")
Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets
CoffeeScript
doc = new DOMParser().parseFromString '
<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
', 'text/xml'
# Retrieve the first "item" element
doc.evaluate('//item', doc, {}, 7, {}).snapshotItem 0
# Perform an action on each "price" element (print it out)
prices = doc.evaluate "//price", doc, {}, 7, {}
for i in [0...prices.snapshotLength] by 1
console.log prices.snapshotItem(i).textContent
# Get an array of all the "name" elements
names = doc.evaluate "//name", doc, {}, 7, {}
names = for i in [0...names.snapshotLength] by 1
names.snapshotItem i
ColdFusion
<cfsavecontent variable="xmlString">
<inventory
...
</inventory>
</cfsavecontent>
<cfset xml = xmlParse(xmlString)>
<!--- First Task --->
<cfset itemSearch = xmlSearch(xml, "//item")>
<!--- item = the first Item (xml element object) --->
<cfset item = itemSearch[1]>
<!--- Second Task --->
<cfset priceSearch = xmlSearch(xml, "//price")>
<!--- loop and print each price --->
<cfloop from="1" to="#arrayLen(priceSearch)#" index="i">
#priceSearch[i].xmlText#<br/>
</cfloop>
<!--- Third Task --->
<!--- array of all the name elements --->
<cfset names = xmlSearch(xml, "//name")>
<!--- visualize the results --->
<cfdump var="#variables#">
Common Lisp
{{libheader|plexippus-xpath}} {{libheader|cxml}} {{libheader|cxml-stp}}
(dolist (system '(:xpath :cxml-stp :cxml)) (asdf:oos 'asdf:load-op system)) (defparameter *doc* (cxml:parse-file "xml" (stp:make-builder))) (xpath:first-node (xpath:evaluate "/inventory/section[1]/item[1]" *doc*)) (xpath:do-node-set (node (xpath:evaluate "/inventory/section/item/price/text()" *doc*)) (format t "~A~%" (stp:data node))) (defun node-array (node-set) (coerce (xpath:all-nodes node-set) 'vector)) (node-array (xpath:evaluate "/inventory/section/item/name" *doc*))
D
It is important to note that the KXML library currently only supports XPath minimally. {{libheader|KXML}}
import kxml.xml; char[]xmlinput = "<inventory title=\"OmniCorp Store #45x10^3\"> <section name=\"health\"> <item upc=\"123456789\" stock=\"12\"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc=\"445322344\" stock=\"18\"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name=\"food\"> <item upc=\"485672034\" stock=\"653\"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc=\"132957764\" stock=\"44\"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory> "; void main() { auto root = readDocument(xmlinput); auto firstitem = root.parseXPath("inventory/section/item")[0]; foreach(price;root.parseXPath("inventory/section/item/price")) { std.stdio.writefln("%s",price.getCData); } auto namearray = root.parseXPath("inventory/section/item/name"); }
Delphi
program XMLXPath;
{$APPTYPE CONSOLE}
uses ActiveX, MSXML;
const
XML =
'<inventory title="OmniCorp Store #45x10^3">' +
' <section name="health">' +
' <item upc="123456789" stock="12">' +
' <name>Invisibility Cream</name>' +
' <price>14.50</price>' +
' <description>Makes you invisible</description>' +
' </item>' +
' <item upc="445322344" stock="18">' +
' <name>Levitation Salve</name>' +
' <price>23.99</price>' +
' <description>Levitate yourself for up to 3 hours per application</description>' +
' </item>' +
' </section>' +
' <section name="food">' +
' <item upc="485672034" stock="653">' +
' <name>Blork and Freen Instameal</name>' +
' <price>4.95</price>' +
' <description>A tasty meal in a tablet; just add water</description>' +
' </item>' +
' <item upc="132957764" stock="44">' +
' <name>Grob winglets</name>' +
' <price>3.56</price>' +
' <description>Tender winglets of Grob. Just add water</description>' +
' </item>' +
' </section>' +
'</inventory>';
var
i: Integer;
s: string;
lXMLDoc: IXMLDOMDocument2;
lNodeList: IXMLDOMNodeList;
lNode: IXMLDOMNode;
lItemNames: array of string;
begin
CoInitialize(nil);
lXMLDoc := CoDOMDocument.Create;
lXMLDoc.setProperty('SelectionLanguage', 'XPath');
lXMLDoc.loadXML(XML);
Writeln('First item node:');
lNode := lXMLDoc.selectNodes('//item')[0];
Writeln(lNode.xml);
Writeln('');
lNodeList := lXMLDoc.selectNodes('//price');
for i := 0 to lNodeList.length - 1 do
Writeln('Price = ' + lNodeList[i].text);
Writeln('');
lNodeList := lXMLDoc.selectNodes('//item/name');
SetLength(lItemNames, lNodeList.length);
for i := 0 to lNodeList.length - 1 do
lItemNames[i] := lNodeList[i].text;
for s in lItemNames do
Writeln('Item name = ' + s);
end.
Output:
Price = 14.50 Price = 23.99 Price = 4.95 Price = 3.56
Item name = Invisibility Cream Item name = Levitation Salve Item name = Blork and Freen Instameal Item name = Grob winglets
## E
{{libheader|E-XML}} (currently a very early work in progress/draft library; design comments welcome)
```e
? def xml__quasiParser := <import:org.switchb.e.xml.makeXMLQuasiParser>()
> def xpath__quasiParser := xml__quasiParser.xPathQuasiParser()
> null
? def doc := xml`<inventory title="OmniCorp Store #45x10^3">
> <section name="health">
> <item upc="123456789" stock="12">
> <name>Invisibility Cream</name>
> <price>14.50</price>
> <description>Makes you invisible</description>
> </item>
> <item upc="445322344" stock="18">
> <name>Levitation Salve</name>
> <price>23.99</price>
> <description>Levitate yourself for up to 3 hours per application</description>n>
> </item>
> </section>
> <section name="food">
> <item upc="485672034" stock="653">
> <name>Blork and Freen Instameal</name>
> <price>4.95</price>
> <description>A tasty meal in a tablet; just add water</description>
> </item>
> <item upc="132957764" stock="44">
> <name>Grob winglets</name>
> <price>3.56</price>
> <description>Tender winglets of Grob. Just add water</description>
> </item>
> </section>
> </inventory>`
# value: xml`...`
? doc[xpath`inventory/section/item`][0]
# value: xml`<item stock="12" upc="123456789">
# <name>Invisibility Cream</name>
# <price>14.50</price>
# <description>Makes you invisible</description>
# </item>`
? for price in doc[xpath`inventory/section/item/price/text()`] { println(price :String) }
14.50
23.99
4.95
3.56
? doc[xpath`inventory/section/item/name`]
# value: [xml`<name>Invisibility Cream</name>`,
# xml`<name>Levitation Salve</name>`,
# xml`<name>Blork and Freen Instameal</name>`,
# xml`<name>Grob winglets</name>`]
Erlang
{{libheader|xmerl}}
-module(xml_xpath). -include_lib("xmerl/include/xmerl.hrl"). -export([main/0]). main() -> XMLDocument = "<inventory title=\"OmniCorp Store #45x10^3\"> <section name=\"health\"> <item upc=\"123456789\" stock=\"12\"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc=\"445322344\" stock=\"18\"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name=\"food\"> <item upc=\"485672034\" stock=\"653\"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc=\"132957764\" stock=\"44\"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory>", {Document,_} = xmerl_scan:string(XMLDocument), io:format("First item:\n~s\n", [lists:flatten( xmerl:export_simple( [hd(xmerl_xpath:string("//item[1]", Document))], xmerl_xml, [{prolog, ""}]))]), io:format("Prices:\n"), [ io:format("~s\n",[Content#xmlText.value]) || #xmlElement{content = [Content|_]} <- xmerl_xpath:string("//price", Document)], io:format("Names:\n"), [ Content#xmlText.value || #xmlElement{content = [Content|_]} <- xmerl_xpath:string("//name", Document)].
Output:
First item:
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
Prices:
14.50
23.99
4.95
3.56
Names:
["Invisibility Cream","Levitation Salve",
"Blork and Freen Instameal","Grob winglets"]
=={{header|F_Sharp|F#}}==
open System.IO open System.Xml.XPath let xml = new StringReader(""" <inventory title="OmniCorp Store #45x10^3"> <section name="health"> <item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc="445322344" stock="18"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name="food"> <item upc="485672034" stock="653"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc="132957764" stock="44"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory> """) let nav = XPathDocument(xml).CreateNavigator() // first "item"; throws if none exists let item = nav.SelectSingleNode(@"//item[1]") // apply a operation (print text value) to all price elements for price in nav.Select(@"//price") do printfn "%s" (price.ToString()) // array of all name elements let names = seq { for name in nav.Select(@"//name") do yield name } |> Seq.toArray
Factor
{{libheader|xml}} {{libheader|xml.data}} {{libheader|xml.traversal}}
! Get first item element
"""<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>""" string>xml "item" deep-tag-named
! Print out prices
"""<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>""" string>xml "price" deep-tags-named [ children>> first ] map
! Array of all name elements
"""<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>""" string>xml "name" deep-tags-named
Gastona
The example uses the command XMELON which parses a XML file of any schema and stores its contents into db tables. This parser is described in the article [http://web3.codeproject.com/Articles/680642/XMeLon-Schema XMeLon-Schema]
#javaj#
<frames> oSal, XML Path sample, 300, 400
#data#
<xml>
//<inventory title="OmniCorp Store #45x10^3">
// <section name="health">
// <item upc="123456789" stock="12">
// <name>Invisibility Cream</name>
// <price>14.50</price>
// <description>Makes you invisible</description>
// </item>
// <item upc="445322344" stock="18">
// <name>Levitation Salve</name>
// <price>23.99</price>
// <description>Levitate yourself for up to 3 hours per application</description>
// </item>
// </section>
// <section name="food">
// <item upc="485672034" stock="653">
// <name>Blork and Freen Instameal</name>
// <price>4.95</price>
// <description>A tasty meal in a tablet; just add water</description>
// </item>
// <item upc="132957764" stock="44">
// <name>Grob winglets</name>
// <price>3.56</price>
// <description>Tender winglets of Grob. Just add water</description>
// </item>
// </section>
//</inventory>
<DEEP_SQL_XML>
DEEP DB, SELECT, xmelon_data
,, path pathStr
,, tag tagStr
,, patCnt
,, dataPlace
,, value
#listix#
<main>
//parsing xml data ...
GEN, :mem datos, xml
XMELON, FILE2DB, :mem datos
//
//first item ...
//
//
LOOP, SQL,, //SELECT patCnt AS patITEM1 FROM (@<DEEP_SQL_XML>) WHERE path_pathStr == '/inventory/section/item' LIMIT 1
,HEAD, //<item
,, LOOP, SQL,, //SELECT * FROM (@<DEEP_SQL_XML>) WHERE patCnt == @<patITEM1> AND dataPlace == 'A'
,, , LINK, ""
,, ,, // @<tag_tagStr>="@<value>"
,, //>
,, //
,, LOOP, SQL,, //SELECT * FROM (@<DEEP_SQL_XML>) WHERE patCnt == @<patITEM1> AND dataPlace != 'A'
,, ,, // <@<tag_tagStr>>@<value></@<tag_tagStr>>
,TAIL, //
,TAIL, //</item>
//
//
//report prices ...
//
LOOP, SQL,, //SELECT value FROM (@<DEEP_SQL_XML>) WHERE tag_tagStr == 'price'
, LINK, ", "
,, @<value>
//
//put names into a variable
//
VAR=, tabnames, "name"
LOOP, SQL,, //SELECT value FROM (@<DEEP_SQL_XML>) WHERE tag_tagStr == 'name'
, LINK, ""
,, VAR+, tabnames, @<value>
DUMP, data,, tabnames
{{out|Output}}
parsing xml data ...
first item ...
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
report prices ...
14.50, 23.99, 4.95, 3.56
names into a variable
#data#
<tabnames>
//name
//health
//Invisibility Cream
//Levitation Salve
//food
//Blork and Freen Instameal
//Grob winglets
Go
Using the standard encoding/xml package:
package main import ( "encoding/xml" "fmt" "log" "os" ) type Inventory struct { XMLName xml.Name `xml:"inventory"` Title string `xml:"title,attr"` Sections []struct { XMLName xml.Name `xml:"section"` Name string `xml:"name,attr"` Items []struct { XMLName xml.Name `xml:"item"` Name string `xml:"name"` UPC string `xml:"upc,attr"` Stock int `xml:"stock,attr"` Price float64 `xml:"price"` Description string `xml:"description"` } `xml:"item"` } `xml:"section"` } // To simplify main's error handling func printXML(s string, v interface{}) { fmt.Println(s) b, err := xml.MarshalIndent(v, "", "\t") if err != nil { log.Fatal(err) } fmt.Println(string(b)) fmt.Println() } func main() { fmt.Println("Reading XML from standard input...") var inv Inventory dec := xml.NewDecoder(os.Stdin) if err := dec.Decode(&inv); err != nil { log.Fatal(err) } // At this point, inv is Go struct with all the fields filled // in from the XML data. Well-formed XML input that doesn't // match the specification of the fields in the Go struct are // discarded without error. // We can reformat the parts we parsed: //printXML("Got:", inv) // 1. Retrieve first item: item := inv.Sections[0].Items[0] fmt.Println("item variable:", item) printXML("As XML:", item) // 2. Action on each price: fmt.Println("Prices:") var totalValue float64 for _, s := range inv.Sections { for _, i := range s.Items { fmt.Println(i.Price) totalValue += i.Price * float64(i.Stock) } } fmt.Println("Total inventory value:", totalValue) fmt.Println() // 3. Slice of all the names: var names []string for _, s := range inv.Sections { for _, i := range s.Items { names = append(names, i.Name) } } fmt.Printf("names: %q\n", names) }
{{out}}
Reading XML from standard input...
item variable: {{ item} Invisibility Cream 123456789 12 14.5 Makes you invisible}
As XML:
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.5</price>
<description>Makes you invisible</description>
</item>
Prices:
14.5
23.99
4.95
3.56
Total inventory value: 3994.81
names: ["Invisibility Cream" "Levitation Salve" "Blork and Freen Instameal" "Grob winglets"]
{{libheader|xmlpath}}
package main import ( "fmt" "os" "launchpad.net/xmlpath" ) func main() { f, err := os.Open("test3.xml") if err != nil { fmt.Println(err) return } n, err := xmlpath.Parse(f) f.Close() if err != nil { fmt.Println(err) return } q1 := xmlpath.MustCompile("//item") if _, ok := q1.String(n); !ok { fmt.Println("no item") } q2 := xmlpath.MustCompile("//price") for it := q2.Iter(n); it.Next(); { fmt.Println(it.Node()) } q3 := xmlpath.MustCompile("//name") names := []*xmlpath.Node{} for it := q3.Iter(n); it.Next(); { names = append(names, it.Node()) } if len(names) == 0 { fmt.Println("no names") } }
{{out}}
14.50
23.99
4.95
3.56
Groovy
def inventory = new XmlSlurper().parseText("<inventory...") //optionally parseText(new File("inv.xml").text) def firstItem = inventory.section.item[0] //1. first item inventory.section.item.price.each { println it } //2. print each price def allNamesArray = inventory.section.item.name.collect {it} //3. collect item names into an array
Haskell
import Data.List import Control.Arrow import Control.Monad takeWhileIncl :: (a -> Bool) -> [a] -> [a] takeWhileIncl _ [] = [] takeWhileIncl p (x:xs) | p x = x : takeWhileIncl p xs | otherwise = [x] getmultiLineItem n = takeWhileIncl(not.isInfixOf ("</" ++ n)). dropWhile(not.isInfixOf ('<': n)) getsingleLineItems n = map (takeWhile(/='<'). drop 1. dropWhile(/='>')). filter (isInfixOf ('<': n)) main = do xml <- readFile "./Rosetta/xmlpath.xml" let xmlText = lines xml putStrLn "\n== First item ==\n" mapM_ putStrLn $ head $ unfoldr (Just. liftM2 (id &&&) (\\) (getmultiLineItem "item")) xmlText putStrLn "\n== Prices ==\n" mapM_ putStrLn $ getsingleLineItems "price" xmlText putStrLn "\n== Names ==\n" print $ getsingleLineItems "name" xmlText
Using the Haskell XML Toolkit (HXT):
{-# LANGUAGE Arrows #-} import Text.XML.HXT.Arrow {- For HXT version >= 9.0, use instead: import Text.XML.HXT.Core -} deepElem name = deep (isElem >>> hasName name) process = proc doc -> do item <- single (deepElem "item") -< doc _ <- listA (arrIO print <<< deepElem "price") -< doc names <- listA (deepElem "name") -< doc returnA -< (item, names) main = do [(item, names)] <- runX (readDocument [] "xmlpath.xml" >>> process) print item print names
HicEst
CHARACTER xml*1000, output*1000
READ(ClipBoard) xml
EDIT(Text=xml, Right='<item', Right=5, GetPosition=a, Right='</item>', Left, GetPosition=z)
WRITE(Text=output) xml( a : z), $CRLF
i = 1
1 EDIT(Text=xml, SetPosition=i, SePaRators='<>', Right='<price>', Word=1, Parse=price, GetPosition=i, ERror=99)
IF(i > 0) THEN
WRITE(Text=output, APPend) 'Price element = ', price, $CRLF
GOTO 1 ! HicEst does not have a "WHILE"
ENDIF
EDIT(Text=xml, SPR='<>', R='<name>', W=1, WordEnd=$CR, APpendTo=output, DO=999)
WRITE(ClipBoard) TRIM(output)
upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
Price element = 14.50
Price element = 23.99
Price element = 4.95
Price element = 3.56
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Java
import java.io.StringReader; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.InputSource; public class XMLParser { final static String xmlStr = "<inventory title=\"OmniCorp Store #45x10^3\">" + " <section name=\"health\">" + " <item upc=\"123456789\" stock=\"12\">" + " <name>Invisibility Cream</name>" + " <price>14.50</price>" + " <description>Makes you invisible</description>" + " </item>" + " <item upc=\"445322344\" stock=\"18\">" + " <name>Levitation Salve</name>" + " <price>23.99</price>" + " <description>Levitate yourself for up to 3 hours per application</description>" + " </item>" + " </section>" + " <section name=\"food\">" + " <item upc=\"485672034\" stock=\"653\">" + " <name>Blork and Freen Instameal</name>" + " <price>4.95</price>" + " <description>A tasty meal in a tablet; just add water</description>" + " </item>" + " <item upc=\"132957764\" stock=\"44\">" + " <name>Grob winglets</name>" + " <price>3.56</price>" + " <description>Tender winglets of Grob. Just add priwater</description>" + " </item>" + " </section>" + "</inventory>"; public static void main(String[] args) { try { Document doc = DocumentBuilderFactory.newInstance() .newDocumentBuilder() .parse(new InputSource(new StringReader(xmlStr))); XPath xpath = XPathFactory.newInstance().newXPath(); // 1 System.out.println(((Node) xpath.evaluate( "/inventory/section/item[1]", doc, XPathConstants.NODE)) .getAttributes().getNamedItem("upc")); // 2, 3 NodeList nodes = (NodeList) xpath.evaluate( "/inventory/section/item/price", doc, XPathConstants.NODESET); for (int i = 0; i < nodes.getLength(); i++) System.out.println(nodes.item(i).getTextContent()); } catch (Exception e) { System.out.println("Error ocurred while parsing XML."); } } }
JavaScript
{{works with|Firefox|2.0}}
//create XMLDocument object from file var xhr = new XMLHttpRequest(); xhr.open('GET', 'file.xml', false); xhr.send(null); var doc = xhr.responseXML; //get first <item> element var firstItem = doc.evaluate( '//item[1]', doc, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ).singleNodeValue; alert( firstItem.textContent ); //output contents of <price> elements var prices = doc.evaluate( '//price', doc, null, XPathResult.ANY_TYPE, null ); for( var price = prices.iterateNext(); price != null; price = prices.iterateNext() ) { alert( price.textContent ); } //add <name> elements to array var names = doc.evaluate( '//name', doc, null, XPathResult.ANY_TYPE, null); var namesArray = []; for( var name = names.iterateNext(); name != null; name = names.iterateNext() ) { namesArray.push( name ); } alert( namesArray );
Although some browsers support XPath, working with XML is much easier with E4X.
//create XML object from file var xhr = new XMLHttpRequest(); xhr.open('GET', 'file.xml', false); xhr.send(null); var doc = new XML(xhr.responseText); //get first <item> element var firstItem = doc..item[0]; alert( firstItem ); //output contents of <price> elements for each( var price in doc..price ) { alert( price ); } //add <name> elements to array var names = []; for each( var name in doc..name ) { names.push( name ); } alert( names );
Julia
Uses the LibExpat module for XML pathing. The exercise description is very vague about output format, so this is varied in the solution below. The first test prints the raw XML node, and the second and third are further processed.
using LibExpat xdoc = raw"""<inventory title="OmniCorp Store #45x10^3"> <section name="health"> <item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc="445322344" stock="18"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name="food"> <item upc="485672034" stock="653"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc="132957764" stock="44"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory> """ debracket(s) = replace(s, r".+\>(.+)\<.+" => s"\1") etree = xp_parse(xdoc) firstshow = LibExpat.find(etree, "//item")[1] println("The first item's node XML entry is:\n", firstshow, "\n\n") prices = LibExpat.find(etree, "//price") println("Prices:") for p in prices println("\t", debracket(string(p))) end println("\n") namearray = LibExpat.find(etree, "//name") println("Array of names of items:\n\t", map(s -> debracket(string(s)), namearray))
{{output}}
The first item's node XML entry is:
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
Prices:
14.50
23.99
4.95
3.56
Array of names of items:
["Invisibility Cream", "Levitation Salve", "Blork and Freen Instameal", "Grob winglets"]
Kotlin
// version 1.1.3 import javax.xml.parsers.DocumentBuilderFactory import org.xml.sax.InputSource import java.io.StringReader import javax.xml.xpath.XPathFactory import javax.xml.xpath.XPathConstants import org.w3c.dom.Node import org.w3c.dom.NodeList val xml = """ <inventory title="OmniCorp Store #45x10^3"> <section name="health"> <item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc="445322344" stock="18"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name="food"> <item upc="485672034" stock="653"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc="132957764" stock="44"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory> """ fun main(args: Array<String>) { val dbFactory = DocumentBuilderFactory.newInstance() val dBuilder = dbFactory.newDocumentBuilder() val xmlInput = InputSource(StringReader(xml)) val doc = dBuilder.parse(xmlInput) val xpFactory = XPathFactory.newInstance() val xPath = xpFactory.newXPath() val qNode = xPath.evaluate("/inventory/section/item[1]", doc, XPathConstants.NODE) as Node val upc = qNode.attributes.getNamedItem("upc") val stock = qNode.attributes.getNamedItem("stock") println("For the first item : upc = ${upc.textContent} and stock = ${stock.textContent}") val qNodes = xPath.evaluate("/inventory/section/item/price", doc, XPathConstants.NODESET) as NodeList print("\nThe prices of each item are : ") for (i in 0 until qNodes.length) print("${qNodes.item(i).textContent} ") println() val qNodes2 = xPath.evaluate("/inventory/section/item/name", doc, XPathConstants.NODESET) as NodeList val names = Array<String>(qNodes2.length) { qNodes2.item(it).textContent } println("\nThe names of each item are as follows :") println(" ${names.joinToString("\n ")}") }
{{out}}
For the first item : upc = 123456789 and stock = 12
The prices of each item are : 14.50 23.99 4.95 3.56
The names of each item are as follows :
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Lasso
Lasso has built in support for both XML handling and Xpaths
// makes extracting attribute values easier
define xml_attrmap(in::xml_namedNodeMap_attr) => {
local(out = map)
with attr in #in
do #out->insert(#attr->name = #attr->value)
return #out
}
local(
text = '<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
',
xml = xml(#text)
)
local(
items = #xml -> extract('//item'),
firstitem = #items -> first,
itemattr = xml_attrmap(#firstitem -> attributes),
newprices = array
)
'<strong>First item:</strong><br />
UPC: '
#itemattr -> find('upc')
' (stock: '
#itemattr -> find('stock')
')<br />'
#firstitem -> extractone('name') -> nodevalue
' ['
#firstitem -> extractone('price') -> nodevalue
'] ('
#firstitem -> extractone('description') -> nodevalue
')<br /><br />'
with item in #items
let name = #item -> extractone('name') -> nodevalue
let price = #item -> extractone('price') -> nodevalue
do {
#newprices -> insert(#name + ': ' + (decimal(#price) * 1.10) -> asstring(-precision = 2) + ' (' + #price + ')')
}
'<strong>Adjusted prices:</strong><br />'
#newprices -> join('<br />')
'<br /><br />'
'<strong>Array with all names:</strong><br />'
#xml -> extract('//name') -> asstaticarray
Output:
First item:
UPC: 123456789 (stock: 12)
Invisibility Cream [14.50] (Makes you invisible)
Adjusted prices:
Invisibility Cream: 15.95 (14.50)
Levitation Salve: 26.39 (23.99)
Blork and Freen Instameal: 5.45 (4.95)
Grob winglets: 3.92 (3.56)
Array with all names:
staticarray(Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets)
LiveCode
Copy the xml in this task into a text field called "FieldXML"
put revXMLCreateTree(fld "FieldXML",true,true,false) into xmltree
// task 1
put revXMLEvaluateXPath(xmltree,"//item[1]") into nodepath
put revXMLText(xmltree,nodepath,true)
// task 2
put revXMLDataFromXPathQuery(xmltree,"//item/price",,comma)
// task 3
put revXMLDataFromXPathQuery(xmltree,"//name") into namenodes
filter namenodes without empty
split namenodes using cr
put namenodes is an array
Lua
Requires LuaExpat
require 'lxp' data = [[<inventory title="OmniCorp Store #45x10^3"> <section name="health"> <item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc="445322344" stock="18"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name="food"> <item upc="485672034" stock="653"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc="132957764" stock="44"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory>]] local first = true local names, prices = {}, {} p = lxp.new({StartElement = function (parser, name) local a, b, c = parser:pos() --line, offset, pos if name == 'item' and first then print(data:match('.-</item>', c - b + 1)) first = false end if name == 'name' then names[#names+1] = data:match('>(.-)<', c) end if name == 'price' then prices[#prices+1] = data:match('>(.-)<', c) end end}) p:parse(data) p:close() print('Name: ', table.concat(names, ', ')) print('Price: ', table.concat(prices, ', '))
Output:
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
Name: Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets
Price: 14.50, 23.99, 4.95, 3.56
Mathematica
example = Import["test.txt", "XML"];
Cases[example, XMLElement["item", _ , _] , Infinity] // First
Cases[example, XMLElement["price", _, List[n_]] -> n, Infinity] // Column
Cases[example, XMLElement["name", _, List[n_]] -> n, Infinity] // Column
Output:
XMLElement[item,{upc->123456789,stock->12},
{XMLElement[name,{},{Invisibility Cream}],XMLElement[price,{},{14.50}],XMLElement[description,{},{Makes you invisible}]}]
14.50
23.99
4.95
3.56
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
NetRexx
{{trans|Java}}
/* NetRexx */
options replace format comments java crossref symbols binary
import javax.xml.parsers.
import javax.xml.xpath.
import org.w3c.dom.
import org.xml.sax.
xmlStr = '' -
|| '<inventory title="OmniCorp Store #45x10^3">' -
|| ' <section name="health">' -
|| ' <item upc="123456789" stock="12">' -
|| ' <name>Invisibility Cream</name>' -
|| ' <price>14.50</price>' -
|| ' <description>Makes you invisible</description>' -
|| ' </item>' -
|| ' <item upc="445322344" stock="18">' -
|| ' <name>Levitation Salve</name>' -
|| ' <price>23.99</price>' -
|| ' <description>Levitate yourself for up to 3 hours per application</description>' -
|| ' </item>' -
|| ' </section>' -
|| ' <section name="food">' -
|| ' <item upc="485672034" stock="653">' -
|| ' <name>Blork and Freen Instameal</name>' -
|| ' <price>4.95</price>' -
|| ' <description>A tasty meal in a tablet; just add water</description>' -
|| ' </item>' -
|| ' <item upc="132957764" stock="44">' -
|| ' <name>Grob winglets</name>' -
|| ' <price>3.56</price>' -
|| ' <description>Tender winglets of Grob. Just add priwater</description>' -
|| ' </item>' -
|| ' </section>' -
|| '</inventory>'
expr1 = '/inventory/section/item[1]'
expr2 = '/inventory/section/item/price'
expr3 = '/inventory/section/item/name'
attr1 = 'upc'
do
doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(InputSource(StringReader(xmlStr)))
xpath = XPathFactory.newInstance().newXPath()
-- Extract attribute from 1st item element
say expr1
say " "(Node xpath.evaluate(expr1, doc, XPathConstants.NODE)).getAttributes().getNamedItem(attr1)
say
-- Extract and display all price elments
nodes = NodeList xpath.evaluate(expr2, doc, XPathConstants.NODESET)
say expr2
loop i_ = 0 to nodes.getLength() - 1
say Rexx(nodes.item(i_).getTextContent()).format(10, 2)
end i_
say
-- Extract elements and store in an ArrayList
nameList = java.util.List
nameList = ArrayList()
nodes = NodeList xpath.evaluate(expr3, doc, XPathConstants.NODESET)
loop i_ = 0 to nodes.getLength() - 1
nameList.add(nodes.item(i_).getTextContent())
end i_
-- display contents of ArrayList
say expr3
loop n_ = 0 to nameList.size() - 1
say " "nameList.get(n_)
end n_
say
catch ex = Exception
ex.printStackTrace()
end
return
'''Output:'''
/inventory/section/item[1]
upc="123456789"
/inventory/section/item/price
14.50
23.99
4.95
3.56
/inventory/section/item/name
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Nim
import xmldom, xmldomparser let doc = "test3.xml".loadXMLFile.documentElement # 1st task: retrieve the first "item" element let i = doc.getElementsByTagName("item")[0] # 2nd task: perform an action on each "price" element (print it out) for j in doc.getElementsByTagName "price": echo j.firstChild.PText.data # 3rd task: get an array of all the "name" elements let namesArray = doc.getElementsByTagName "name"
Objeck
XPath is used to fetch element tags.
use XML;
bundle Default {
class Test {
function : Main(args : String[]) ~ Nil {
in := String->New();
in->Append("<inventory title=\"OmniCorp Store #45x10^3\">");
in->Append("<section name=\"health\">");
in->Append("<item upc=\"123456789\" stock=\"12\">");
in->Append("<name>Invisibility Cream</name>");
in->Append("<price>14.50</price>");
in->Append("<description>Makes you invisible</description>");
in->Append("</item>");
in->Append("<item upc=\"445322344\" stock=\"18\">");
in->Append("<name>Levitation Salve</name>");
in->Append("<price>23.99</price>");
in->Append("<description>Levitate yourself for up to 3 hours per application</description>");
in->Append("</item>");
in->Append("</section>");
in->Append("<section name=\"food\">");
in->Append("<item upc=\"485672034\" stock=\"653\">");
in->Append("<name>Blork and Freen Instameal</name>");
in->Append("<price>4.95</price>");
in->Append("<description>A tasty meal in a tablet; just add water</description>");
in->Append("</item>");
in->Append("<item upc=\"132957764\" stock=\"44\">");
in->Append("<name>Grob winglets</name>");
in->Append("<price>3.56</price>");
in->Append("<description>Tender winglets of Grob. Just add water</description>");
in->Append("</item>");
in->Append("</section>");
in->Append("</inventory>");
parser := XmlParser->New(in);
if(parser->Parse()) {
# get first item
results := parser->FindElements("//inventory/section[1]/item[1]");
if(results <> Nil) {
IO.Console->Instance()->Print("items: ")->PrintLine(results->Size());
};
# get all prices
results := parser->FindElements("//inventory/section/item/price");
if(results <> Nil) {
each(i : results) {
element := results->Get(i)->As(XMLElement);
element->GetContent()->PrintLine();
};
};
# get names
results := parser->FindElements("//inventory/section/item/name");
if(results <> Nil) {
IO.Console->Instance()->Print("names: ")->PrintLine(results->Size());
};
};
}
}
}
Oz
We implement a small subset of XPath for this task:
declare
[XMLParser] = {Module.link ['x-oz://system/xml/Parser.ozf']}
proc {Main Data}
Parser = {New XMLParser.parser init}
[Doc] = {Parser parseVS(Data $)}
FirstItem = {XPath Doc [inventory section item]}.1
Prices = {XPath Doc [inventory section item price Text]}
Names = {XPath Doc [inventory section item name]}
in
{ForAll Prices System.showInfo}
end
%%
%% Emulation of some XPath functionality:
%%
fun {XPath Doc Path}
P|Pr = Path
in
Doc.name = P %% assert
{FoldL Pr XPathStep [Doc]}
end
fun {XPathStep Elements P}
if {IsProcedure P} then
{Map Elements P}
else
{FilteredChildren Elements P}
end
end
%% A flat list of all Type-children of all Elements.
fun {FilteredChildren Elements Type}
{Flatten
{Map Elements
fun {$ E}
{Filter E.children
fun {$ X}
case X of element(name:!Type ...) then true
else false
end
end}
end}}
end
%% PCDATA of an element as a ByteString
fun {Text Element}
Texts = for Child in Element.children collect:C do
case Child of text(data:BS ...) then {C BS} end
end
in
{FoldR Texts ByteString.append {ByteString.make nil}}
end
Data =
"<inventory title=\"OmniCorp Store #45x10^3\">"
#" <section name=\"health\">"
#" <item upc=\"123456789\" stock=\"12\">"
#" <name>Invisibility Cream</name>"
#" <price>14.50</price>"
#" <description>Makes you invisible</description>"
#" </item>"
#" <item upc=\"445322344\" stock=\"18\">"
#" <name>Levitation Salve</name>"
#" <price>23.99</price>"
#" <description>Levitate yourself for up to 3 hours per application</description>"
#" </item>"
#" </section>"
#" <section name=\"food\">"
#" <item upc=\"485672034\" stock=\"653\">"
#" <name>Blork and Freen Instameal</name>"
#" <price>4.95</price>"
#" <description>A tasty meal in a tablet; just add water</description>"
#" </item>"
#" <item upc=\"132957764\" stock=\"44\">"
#" <name>Grob winglets</name>"
#" <price>3.56</price>"
#" <description>Tender winglets of Grob. Just add water</description>"
#" </item>"
#" </section>"
#"</inventory>"
in
{Main Data}
Perl
{{libheader|XML::XPath}}
use XML::XPath qw(); my $x = XML::XPath->new('<inventory ... </inventory>'); [$x->findnodes('//item[1]')->get_nodelist]->[0]; print $x->findnodes_as_string('//price'); $x->findnodes('//name')->get_nodelist;
Perl 6
use XML::XPath;
my $XML = XML::XPath.new(xml => q:to/END/);
<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
END
put "First item:\n", $XML.find('//item[1]')[0];
put "\nPrice elements:";
.contents.put for $XML.find('//price').List;
put "\nName elements:\n", $XML.find('//name')».contents.join: ', ';
{{out}}
First item:
<item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item>
Price elements:
14.50
23.99
4.95
3.56
Name elements:
Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets
PHP
<?php //PHP5 only example due to changes in XML extensions between version 4 and 5 (Tested on PHP5.2.0) $doc = DOMDocument::loadXML('<inventory title="OmniCorp Store #45x10^3">...</inventory>'); //Load from file instead with $doc = DOMDocument::load('filename'); $xpath = new DOMXPath($doc); /* 1st Task: Retrieve the first "item" element */ $nodelist = $xpath->query('//item'); $result = $nodelist->item(0); /* 2nd task: Perform an action on each "price" element (print it out) */ $nodelist = $xpath->query('//price'); for($i = 0; $i < $nodelist->length; $i++) { //print each price element in the DOMNodeList instance, $nodelist, as text/xml followed by a newline print $doc->saveXML($nodelist->item($i))."\n"; } /* 3rd Task: Get an array of all the "name" elements */ $nodelist = $xpath->query('//name'); //our array to hold all the name elements, though in practice you'd probably not need to do this and simply use the DOMNodeList $result = array(); //a different way of iterating through the DOMNodeList foreach($nodelist as $node) { $result[] = $node; }
PicoLisp
(load "@lib/xm.l")
(let Sections (body (in "file.xml" (xml)))
(pretty (car (body (car Sections))))
(prinl)
(for S Sections
(for L (body S)
(prinl (car (body L 'price))) ) )
(make
(for S Sections
(for L (body S)
(link (car (body L 'name))) ) ) ) )
Output:
(item
((upc . "123456789") (stock . "12"))
(name NIL "Invisibility Cream")
(price NIL "14.50")
(description NIL "Makes you invisible") )
14.50
23.99
4.95
3.56
-> ("Invisibility Cream" "Levitation Salve" "Blork and Freen Instameal" "Grob winglets")
PowerShell
Cast the $document string as [xml] and you have access to .NET methods affecting XML.
$document = [xml]@' <inventory title="OmniCorp Store #45x10^3"> <section name="health"> <item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item> <item upc="445322344" stock="18"> <name>Levitation Salve</name> <price>23.99</price> <description>Levitate yourself for up to 3 hours per application</description> </item> </section> <section name="food"> <item upc="485672034" stock="653"> <name>Blork and Freen Instameal</name> <price>4.95</price> <description>A tasty meal in a tablet; just add water</description> </item> <item upc="132957764" stock="44"> <name>Grob winglets</name> <price>3.56</price> <description>Tender winglets of Grob. Just add water</description> </item> </section> </inventory> '@ $query = "/inventory/section/item" $items = $document.SelectNodes($query)
The first item:
$items[0]
{{Out}}
upc : 123456789
stock : 12
name : Invisibility Cream
price : 14.50
description : Makes you invisible
Get some useful information:
$namesAndPrices = $items | Select-Object -Property name, price $namesAndPrices
{{Out}}
name price
---- -----
Invisibility Cream 14.50
Levitation Salve 23.99
Blork and Freen Instameal 4.95
Grob winglets 3.56
Here are the prices:
$items.price
{{Out}}
14.50
23.99
4.95
3.56
Here are the names:
$items.name
{{Out}}
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
Python
# Python has basic xml parsing built in from xml.dom import minidom xmlfile = file("test3.xml") # load xml document from file xmldoc = minidom.parse(xmlfile).documentElement # parse from file stream or... xmldoc = minidom.parseString("<inventory title="OmniCorp Store #45x10^3">...</inventory>").documentElement # alternatively, parse a string # 1st Task: Retrieve the first "item" element i = xmldoc.getElementsByTagName("item") # get a list of all "item" tags firstItemElement = i[0] # get the first element # 2nd task: Perform an action on each "price" element (print it out) for j in xmldoc.getElementsByTagName("price"): # get a list of all "price" tags print j.childNodes[0].data # XML Element . TextNode . data of textnode # 3rd Task: Get an array of all the "name" elements namesArray = xmldoc.getElementsByTagName("name")
In Python 2.5+ you can use ElementTree's limited XPath support
import xml.etree.ElementTree as ET xml = open('inventory.xml').read() doc = ET.fromstring(xml) doc = ET.parse('inventory.xml') # or load it directly # Note, ElementTree's root is the top level element. So you need ".//" to really start searching from top # Return first Item item1 = doc.find("section/item") # or ".//item" # Print each price for p in doc.findall("section/item/price"): # or ".//price" print "{0:0.2f}".format(float(p.text)) # could raise exception on missing text or invalid float() conversion # list of names names = doc.findall("section/item/name") # or ".//name"
Or, you can install the lxml package and get full XPath support
from lxml import etree xml = open('inventory.xml').read() doc = etree.fromstring(xml) doc = etree.parse('inventory.xml') # or load it directly # Return first item item1 = doc.xpath("//section[1]/item[1]") # Print each price for p in doc.xpath("//price"): print "{0:0.2f}".format(float(p.text)) # could raise exception on missing text or invalid float() conversion names = doc.xpath("//name") # list of names
R
{{libheader|XML (R)}}
## Require the XML package you can download from http://www.omegahat.org/RSXML/ library("XML") doc <- xmlInternalTreeParse("test3.xml") # 1st Task: Retrieve the first "item" element (firstItemElement <- getNodeSet(doc, "//item")[[1]]) # 2nd task: Perform an action on each "price" element (print it out) prices <- sapply(getNodeSet(doc, "//price"), xmlValue) for(i in 1:length(prices)) print(prices[i]) # 3rd Task: Get an array of all the "name" elements (namesArray <- sapply(getNodeSet(doc, "//name"), xmlValue))
Racket
#lang at-exp racket
(define input @~a{
<inventory title="OmniCorp Store #45x10^3">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>})
(require xml xml/path)
(define data (xml->xexpr
((eliminate-whitespace '(inventory section item))
(read-xml/element (open-input-string input)))))
;; Retrieve the first "item" element
(displayln (xexpr->string (se-path* '(item) data)))
;; => <name>Invisibility Cream</name>
;; Perform an action on each "price" element (print it out)
(printf "Prices: ~a\n" (string-join (se-path*/list '(item price) data) ", "))
;; => Prices: 14.50, 23.99, 4.95, 3.56
;; Get an array of all the "name" elements
(se-path*/list '(item name) data)
;; => '("Invisibility Cream" "Levitation Salve" "Blork and Freen Instameal" "Grob winglets")
Rascal
import lang::xml::DOM;
import Prelude;
public void get_first_item(loc a){
D = parseXMLDOM(readFile(a));
top-down-break visit(D){
case E:element(_,"item",_): return println(xmlPretty(E));
};
}
public void print_prices(loc a){
D = parseXMLDOM(readFile(a));
for(/element(_,"price",[charData(/str p)]) := D)
println(p);
}
public list[str] get_names(loc a){
D = parseXMLDOM(readFile(a));
L = [];
for(/element(_,"name",[charData(/str n)]) := D)
L += n;
return L;
}
Example output:
get_first_item(|file:///Users/.../Desktop/xmlpath.xml|)
<?xml version="1.0" encoding="UTF-8"?>
<item stock="12" upc="123456789">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
ok
rascal>print_prices(|file:///Users/.../Desktop/xmlpath.xml|)
14.50
23.99
4.95
3.56
ok
rascal>get_names(|file:///Users/.../Desktop/xmlpath.xml|)
list[str]: ["Invisibility Cream","Levitation Salve","Blork and Freen Instameal","Grob winglets"]
REXX
hard coded parsing
/*REXX program to parse various queries on an XML document (from a file). */
iFID='XPATH.XML' /*name of the input XML file (doc). */
$= /*string will contain the file's text. */
do j=1 while lines(iFID)\==0 /*read the entire file into a string. */
$=$ linein(iFID) /*append the line to the $ string. */
end /*j*/
/* [↓] show 1st ITEM in the document*/
parse var $ '<item ' item "</item>"
say center('first item:',length(space(item)),'─') /*display a nice header.*/
say space(item)
/* [↓] show all PRICES in the document*/
prices= /*nullify the list and add/append to it*/
$$=$ /*start with a fresh copy of document. */
do until $$='' /* [↓] keep parsing string until done.*/
parse var $$ '<price>' price '</price>' $$
prices=prices price /*add/append the price to the list. */
end /*until*/
say
say center('prices:',length(space(prices)),'─') /*display a nice header.*/
say space(prices)
/* [↓] show all NAMES in the document*/
names.= /*nullify the list and add/append to it*/
L=length(' names: ') /*maximum length of any one list name. */
$$=$ /*start with a fresh copy of document. */
do #=1 until $$='' /* [↓] keep parsing string until done.*/
parse var $$ '<name>' names.# '</name>' $$
L=max(L,length(names.#)) /*L: is used to find the widest name. */
end /*#*/
names.0=#-1; say /*adjust the number of names (DO loop).*/
say center('names:',L,'─') /*display a nicely formatted header. */
do k=1 for names.0 /*display all the names in the list. */
say names.k /*display a name from the NAMES list.*/
end /*k*/
/*stick a fork in it, we're all done. */
'''output'''
──────────────────────────────────────────────────────────first item:──────────────────────────────────────────────────────────
upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description>
───────prices:───────
14.50 23.99 4.95 3.56
─────────names:──────────
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
generic parsing
/*REXX program to parse various queries on an XML document (from a file). */
iFID='XPATH.XML' /*name of the input XML file (doc). */
$= /*string will contain the file's text. */
do j=1 while lines(iFID)\==0 /*read the entire file into a string. */
$=$ linein(iFID) /*append the line to the $ string. */
end /*j*/
/* [↓] display 1st ITEM in document. */
call parser 'item', 0 /*go and parse the all the ITEMs. */
say center('first item:',@L.1,'─') /*display a nicely formatted header. */
say @.1; say /*display the first ITEM found. */
call parser 'price' /*go and parse all the PRICEs. */
say center('prices:',length(@@@),'─') /*display a nicely formatted header. */
say @@@; say /*display a list of all the prices. */
call parser 'name'
say center('names:',@L,'─') /*display a nicely formatted header. */
do k=1 for # /*display all the names in the list. */
say @.k /*display a name from the NAMES list.*/
end /*k*/
exit /*stick a fork in it, we're all done. */
/*────────────────────────────────────────────────────────────────────────────*/
parser: parse arg yy,tail,,@. @@. @@@; $$=$; @L=9; yb='<'yy; ye='</'yy">"
tail=word(tail 1, 1) /*use a tail ">" or not?*/
do #=1 until $$='' /*parse complete XML doc. */
if tail then parse var $$ (yb) '>' @@.# (ye) $$ /*find meat.*/
else parse var $$ (yb) @@.# (ye) $$ /* " " */
@.#=space(@@.#); @@@=space(@@@ @.#) /*shrink; @@@=list of YY.*/
@L.#=length(@.#); @L=max(@L,@L.#) /*length; maximum length. */
end /*#*/
#=#-1 /*adjust # of thing found.*/
return
'''output''' is the same as the 1st version.
Ruby
{{libheader|REXML}}
#Example taken from the REXML tutorial (http://www.germane-software.com/software/rexml/docs/tutorial.html) require "rexml/document" include REXML #create the REXML Document from the string (%q is Ruby's multiline string, everything between the two @-characters is the string) doc = Document.new( %q@<inventory title="OmniCorp Store #45x10^3"> ... </inventory> @ ) # The invisibility cream is the first <item> invisibility = XPath.first( doc, "//item" ) # Prints out all of the prices XPath.each( doc, "//price") { |element| puts element.text } # Gets an array of all of the "name" elements in the document. names = XPath.match( doc, "//name" )
Scala
The code is entered in to Scala's REPL, to better show the results.
scala> val xml: scala.xml.Elem = | <inventory title="OmniCorp Store #45x10^3"> | <section name="health"> | <item upc="123456789" stock="12"> | <name>Invisibility Cream</name> | <price>14.50</price> | <description>Makes you invisible</description> | </item> | <item upc="445322344" stock="18"> | <name>Levitation Salve</name> | <price>23.99</price> | <description>Levitate yourself for up to 3 hours per application</description> | </item> | </section> | <section name="food"> | <item upc="485672034" stock="653"> | <name>Blork and Freen Instameal</name> | <price>4.95</price> | <description>A tasty meal in a tablet; just add water</description> | </item> | <item upc="132957764" stock="44"> | <name>Grob winglets</name> | <price>3.56</price> | <description>Tender winglets of Grob. Just add water</description> | </item> | </section> | </inventory> scala> val firstItem = for { | firstSection <- (xml \ "section").headOption | firstItem <- (firstSection \ "item").headOption | } yield firstItem firstItem: Option[scala.xml.Node] = Some(<item upc="123456789" stock="12"> <name>Invisibility Cream</name> <price>14.50</price> <description>Makes you invisible</description> </item>) scala> val prices = for { | section <- (xml \ "section") | item <- (section \ "item") | price <- (item \ "price") | } yield scala.math.BigDecimal(price.text) prices: List[scala.math.BigDecimal] = List(14.50, 23.99, 4.95, 3.56) scala> val salesTax = prices.sum * 0.05 salesTax: scala.math.BigDecimal = 2.3500 scala> println(salesTax.setScale(2, BigDecimal.RoundingMode.HALF_UP)) 2.35 scala> val names = for { | section <- (xml \ "section").toArray | item <- (section \ "item") | name <- (item \ "name") | } yield name.text names: Array[String] = Array(Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets)
Sidef
{{trans|Perl}}
require('XML::XPath'); var x = %s'XML::XPath'.new(ARGF.slurp); [x.findnodes('//item[1]')][0]; say [x.findnodes('//price')].map{x.getNodeText(_)}; [x.findnodes('//name')];
{{out}}
[14.5, 23.99, 4.95, 3.56]
Tcl
{{libheader|tDOM}}
# assume $xml holds the XML data package require tdom set doc [dom parse $xml] set root [$doc documentElement] set allNames [$root selectNodes //name] puts [llength $allNames] ;# ==> 4 set firstItem [lindex [$root selectNodes //item] 0] puts [$firstItem @upc] ;# ==> 123456789 foreach node [$root selectNodes //price] { puts [$node text] }
TUSCRIPT
$$ MODE TUSCRIPT,{}
MODE DATA
$$ XML=*
<inventory title="OmniCorp Store #45x10³">
<section name="health">
<item upc="123456789" stock="12">
<name>Invisibility Cream</name>
<price>14.50</price>
<description>Makes you invisible</description>
</item>
<item upc="445322344" stock="18">
<name>Levitation Salve</name>
<price>23.99</price>
<description>Levitate yourself for up to 3 hours per application</description>
</item>
</section>
<section name="food">
<item upc="485672034" stock="653">
<name>Blork and Freen Instameal</name>
<price>4.95</price>
<description>A tasty meal in a tablet; just add water</description>
</item>
<item upc="132957764" stock="44">
<name>Grob winglets</name>
<price>3.56</price>
<description>Tender winglets of Grob. Just add water</description>
</item>
</section>
</inventory>
$$ MODE TUSCRIPT
FILE = "test.xml"
ERROR/STOP CREATE (file,fdf-o,-std-)
FILE/ERASE/UTF8 $FILE = xml
BUILD S_TABLE beg=":<item*>:<name>:<price>:"
BUILD S_TABLE end=":</item>:</name>:</price>:"
BUILD S_TABLE modifiedbeg=":<name>:<price>:"
BUILD S_TABLE modifiedend=":</name>:</price>:"
firstitem=names="",countitem=0
ACCESS q: READ/STREAM/UTF8 $FILE s,a/beg+t+e/end
LOOP
READ/EXIT q
IF (a=="<name>") names=APPEND(names,t)
IF (a=="<price>") PRINT t
IF (a.sw."<item") countitem=1
IF (countitem==1) THEN
firstitem=CONCAT(firstitem,a)
firstitem=CONCAT(firstitem,t)
firstitem=CONCAT(firstitem,e)
IF (e=="</item>") THEN
COUNTITEM=0
MODIFY ACCESS q s_TABLE modifiedbeg,-,modifiedend
ENDIF
ENDIF
ENDLOOP
ENDACCESS q
ERROR/STOP CLOSE (file)
firstitem=EXCHANGE (firstitem,":{2-00} ::")
firstitem=INDENT_TAGS (firstitem,-," ")
names=SPLIT(names)
TRACE *firstitem,names
Output:
14.50
23.99
4.95
3.56
TRACE * 63 -*TUSTEP.EDT
firstitem = *
1 = -
2 =
Invisibility Cream
3 = 14.50
4 = Makes you invisible
5 =
names = *
1 = Invisibility Cream
2 = Levitation Salve
3 = Blork and Freen Instameal
4 = Grob winglets
```
## VBScript
```vb
Set objXMLDoc = CreateObject("msxml2.domdocument")
objXMLDoc.load("In.xml")
Set item_nodes = objXMLDoc.selectNodes("//item")
i = 1
For Each item In item_nodes
If i = 1 Then
WScript.StdOut.Write item.xml
WScript.StdOut.WriteBlankLines(2)
Exit For
End If
Next
Set price_nodes = objXMLDoc.selectNodes("//price")
list_price = ""
For Each price In price_nodes
list_price = list_price & price.text & ", "
Next
WScript.StdOut.Write list_price
WScript.StdOut.WriteBlankLines(2)
Set name_nodes = objXMLDoc.selectNodes("//name")
list_name = ""
For Each name In name_nodes
list_name = list_name & name.text & ", "
Next
WScript.StdOut.Write list_name
WScript.StdOut.WriteBlankLines(2)
```
{{out}}
```txt
-
Invisibility Cream
14.50
Makes you invisible
14.50, 23.99, 4.95, 3.56,
Invisibility Cream, Levitation Salve, Blork and Freen Instameal, Grob winglets,
```
## Visual Basic .NET
```vbnet
Dim first_item = xml.XPathSelectElement("//item")
Console.WriteLine(first_item)
For Each price In xml.XPathSelectElements("//price")
Console.WriteLine(price.Value)
Next
Dim names = (From item In xml.XPathSelectElements("//name") Select item.Value).ToArray
```
## XProc
```xml
```
## XQuery
```xquery
(:
1. Retrieve the first "item" element
Notice the braces around //item. This evaluates first all item elements and then retrieving the first one.
Whithout the braces you get the first item for every section.
:)
let $firstItem := (//item)[1]
(: 2. Perform an action on each "price" element (print it out) :)
let $price := //price/data(.)
(: 3. Get an array of all the "name" elements :)
let $names := //name
return
{$firstItem}
{$price}
{$names}
```
Performing this XQuery on the given input document results in
```xquery
-
Invisibility Cream
14.50
Makes you invisible
14.50 23.99 4.95 3.56
Invisibility Cream
Levitation Salve
Blork and Freen Instameal
Grob winglets
```
## XSLT
```xml
The first item element is
The prices are:
The names are:
```
{{omit from|Batch File|No way of XML parsing or processing.}}
{{omit from|PARI/GP|No real capacity for string manipulation}}