Specialized parsers

From WeBWorK_wiki
(Redirected from SpecializedParsers)
Jump to navigation Jump to search

parserYourModsHere.pl Modifications to the Parser change the way that student responses are interpreted. By convention files that modify the parser are named starting with "parser" -- e.g. parserYourModsHere.pl. test SpecializedContexts Describes another advanced method for customizing MathObjects by modifying the context.

Examples of modifications are give below.

A description of advanced techniques for customizing the parser are at Modifying Contexts (advanced).

Specialized Parser Macro files

Here is a partial list of the parser modifying files.

Use loadMacros("parserAssignment.pl"); to make the parser modifications available for a WeBWorK question.

Check the POD documentation for more examples.

  • parserAssignment.pl
    • checks answers of the form [math]y=3x+5[/math] with the LHS of the equation required.
    • follow the link above to see the additional statements that must be inserted in the question to use this file.
  • parserAutoStrings.pl
    • parserAutoStrings.pl - Force String() to accept any string as a potential answer.
  AutoStrings()
    -- all strings are accepted
  DefineStrings("string1", "string2")
  DefineStrings(qw(string1 string2)) 
    -- is a quick way to define "legitimate" strings.
     FormulaWithUnits("3x+1 ft")->cmp
     FormulaWithUnits($a*$x+1,"ft")->cmp
   Context("ImplicitEquation");
   $f = ImplicitEquation("x^2 = cos(y)");
   $f = ImplicitEquation("x^2 - 2y^2 = 5",limits=>[[-3,3],[-2,2]]);
   $f = ImplicitEquation("x=1/y",tolerance=>.0001);
   $P = ImplicitPlane(Point(1,0,2),Vector(-1,1,3)); #  -x+y+3z = 5
   $P = ImplicitPlane([1,0,2],[-1,1,3]);            #  -x+y+3z = 5
   $P = ImplicitPlane([1,0,2],4);                   #  x+2z = 4
   $P = ImplicitPlane("x+2y-z=5");
   ANS(NumberWithUnits("3 ft")->cmp);
   ANS(NumberWithUnits("$a*$b ft")->cmp);
   ANS(NumberWithUnits($a*$b,"ft")->cmp);
  • parserParametricLine.pl
    • Implements Formulas that represent parametric lines.
  • parserPopUp.pl
    • Pop-up menus compatible with Value objects.
  • parserPrime.pl
    • Defines f'(x) so that students and authors can use the prime notation in defining equations.
    • After loading file use perl command parser::Prime->Enable; to enable the feature.
  • parserRadioButtons.pl
    • Radio buttons compatible with Value objects, specifically MultiAnswer objects.
  • parserSolutionFor.pl
    • An answer checker that checks if a student's answer satisifies a (possibly non-linear) implicit equation.
  • parserVectorUtils.pl
    • Utility macros that are useful in vector problems.