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XML Script Interpreter Using DOM API (HW3) & SAX2 API (HW4)

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Develop a Java interpreter to run XML script files that define variables and functions as per the provided DTD. Complete the missing parts in HW3.java and create HW4.java using SAX2 API.

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XML Script Interpreter Using DOM API (HW3) & SAX2 API (HW4)

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  1. Homework 3 & 4 • Reference DTD (xmath.dtd): • http://xml.cs.ncuc.edu.tw/courses/xmlta/xmlta2008/HWs/hw34/xmath.dtd • Reference sample xmath script: • http://xml.cs.ncuc.edu.tw/courses/xmlta/xmlta2008/HWs/hw34/script1.xmath • The above dtd defines a simple script language for defining double variables and single-variable polynomial function.

  2. Sample script : Script1.xml • non-xml version: a = -2 define f(x) = 3x^2 - 5x + 7 define g(x) = 3x^3 -5x^2 +2 combine h = f + g list functions list variables print "The value of f(1) is" f(1) "." print "The value of f(a) is " f(a) "." print "The derivative of g' is " g' "."

  3. Expected output a = -2.0 f(x) = 3x^2 - 5x + 3 g(y) = 3y^3 - 5y^2 + 2 h(x) = 3x^3 - 2x^2 - 5x + 5 The value of f(1) is 1.0. The value of h(a) is -17.0. The derivative of g is g'(y) = 9y^2 - 10y.

  4. Script1.xml : XMLVersion <?xml version="1.0" ?> <script> <assign var="a"><number>-2</number></assign> <define name="f" var="x" > <polynomial var="x" > <term c="3" exp="2" /> <term c="-5" exp="1" /> <term c="3" exp="0" /> </polynomial> </define> <define name="g" var="y" > <polynomial var="y" > <term c="3" exp="3" /> <term c="-5" exp="2" /> < term c="2" exp="0" /> </polynomial></define>

  5. <combine name="h" type="add" fun1="f" fun2="g" /> <list option="variables" /> <list option="functions" /> <print> <literal>The value of f(1) is </literal> <funEval name="f" ><number>1</number></funEval> <literal>.</literal> </print> <print><literal>The value of h(a) is </literal> <funEval name="h"><varRef>a</varRef></funEval> <literal>.</literal></print> <print><literal>The derivative of g is </literal> <derivative>g</derivative><literal>.</literal></print> </script>

  6. HW3 • HW3 : • This homework is about using DOM API to write a Java interpreter that can load a script file in XML format that are valid w.r.t the previous DTD, and then execute it and produce correct result. • We have prepare an almost-completed program HW3.java for you. • Read carefully and try to understand how this program works. • Complete all missing part in HW3.java

  7. HW4 • HW4 : • Same as HW3, but this time use SAX2 API to write a Java program named HW4.java that can load a script file in XML format that are valid w.r.t the previous DTD and then run it and produce correct result. • Your HW4.java file should contain a main public HW4 class (which contains the main(String[]) method) as well as whatever non-public classes like content handler, error handler are needed in your HW4 class. • You can use the template HW4.java I prepared for you.

  8. Notes • We have prepared 3 classes for representing polynomial, terms and functions, respectively. • see http://xml.cs.nccu.edu.tw/courses/xmlta/xmlta2008/hws/hw34/src/xmlta/xmath" • To help grading, please remember that your main java classes should be named as HW3 and HW4, respectively. Both should have a main(String[]) method accepting as input an input file name. So we can invoke them as follows: >java HW3 script1.xmath >java HW4 script2.xmath • I have packaged all related files into one eclipse project hw34.zip, which you can download and import it into your local eclipse workspace. • After completing your homework, you need just submit HW3.java and HW4.java to c3@cs.ncuc.edu.tw.

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