dumpExpression.frink

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/** This dumps an expression as a tree. */

/** This sets up the recursive call. */
dumpExpression[expr] :=
{
   return dumpExpression[expr, 0, ""]
}

dumpExpression[expr, indent, index] :=
{
   type = type[expr]
   result = repeat[" ", indent*4] + (index ? index + ": " : "")  + type[expr]
   if type == "String"
      result = result + ": " + inputForm[expr]   // Do substring?
   if type == "Unit"
      result = result + ": $expr"
   if type == "Symbol"
      result = result + ": " + inputForm[expr]
   
   result = result + "\n"
   
   children = getChildCount[expr]
   
   for i=0 to children-1
      result = result + dumpExpression[getChild[expr, i], indent+1, toString[i]]

   return result
}

/*
println[dumpExpression[parseToExpression["2x^2 + 5x + 3"]]]
println[]

println[dumpExpression[parseToExpression["{|a is isInteger, b is isInteger = 0 | a + b^2}"]]]

println[dumpExpression[getFunction["arctan", 2]]]

println[dumpExpression[parseToExpression["c^2"]]]

c = [1,2,3]
println[dumpExpression[c]]

println[dumpExpression[parseToExpression["(a * b) / c"]]]

println[dumpExpression[newJava["java.math.BigInteger", ["100"]]]]
*/

Download or view dumpExpression.frink in plain text format

This is a program written in the programming language Frink.
For more information, view the Frink Documentation or see More Sample Frink Programs.

Alan Eliasen, eliasen@mindspring.com