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View Code? Open in Web Editor NEWA java infix evaluator based on "Shunting Yard" algorithm.
Home Page: http://javaluator.fathzer.com
License: Apache License 2.0
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Is it possible to implement a method that returns the custom variables from the input given by the user?
Hi! This library is great. Im having just one requirement, however:
Is it possible to implement a method that returns the custom variables from the input given by the user?
For example, the user inputs:
String input = "(workHours^2 * workers)/100";
And for that given input, the method would return : "workHours", "workers".
I did a method that attempts to do that, it works fine except when the variable name contains a number.
For example:
String input = "workHours1^2 * workers2) / 100";
....
allBrackets = new HashSet<>();
allBrackets.add("(");
allBrackets.add(")");
allBrackets.add("[");
allBrackets.add("]");
allBrackets.add("}");
allBrackets.add("{");
allOperators = new HashSet<>();
allOperators.add(LocalizedEvaluator.MULTIPLY.getSymbol());
allOperators.add(LocalizedEvaluator.MODULO.getSymbol());
allOperators.add(LocalizedEvaluator.DIVIDE.getSymbol());
allOperators.add(LocalizedEvaluator.EXPONENT.getSymbol());
allOperators.add(LocalizedEvaluator.MINUS.getSymbol());
allOperators.add(LocalizedEvaluator.NEGATE.getSymbol());
allOperators.add(LocalizedEvaluator.NEGATE_HIGH.getSymbol());
allOperators.add(LocalizedEvaluator.PLUS.getSymbol());
allFunctions = new HashMap<>();
allFunctions.put(LocalizedEvaluator.RAIZ, LocalizedEvaluator.RAIZ.getName());
allFunctions.put(LocalizedEvaluator.ABS, LocalizedEvaluator.ABS.getName());
allFunctions.put(LocalizedEvaluator.ACOSINE, LocalizedEvaluator.ACOSINE.getName());
allFunctions.put(LocalizedEvaluator.ASINE, LocalizedEvaluator.ASINE.getName());
allFunctions.put(LocalizedEvaluator.ATAN, LocalizedEvaluator.ATAN.getName());
allFunctions.put(LocalizedEvaluator.AVERAGE, LocalizedEvaluator.AVERAGE.getName());
allFunctions.put(LocalizedEvaluator.CEIL, LocalizedEvaluator.CEIL.getName());
allFunctions.put(LocalizedEvaluator.COSINE, LocalizedEvaluator.COSINE.getName());
allFunctions.put(LocalizedEvaluator.COSINEH, LocalizedEvaluator.COSINEH.getName());
allFunctions.put(LocalizedEvaluator.FLOOR, LocalizedEvaluator.FLOOR.getName());
allFunctions.put(LocalizedEvaluator.LN, LocalizedEvaluator.LN.getName());
allFunctions.put(LocalizedEvaluator.LOG, LocalizedEvaluator.LOG.getName());
allFunctions.put(LocalizedEvaluator.MAX, LocalizedEvaluator.MAX.getName());
allFunctions.put(LocalizedEvaluator.MIN, LocalizedEvaluator.MIN.getName());
allFunctions.put(LocalizedEvaluator.TANGENTH, LocalizedEvaluator.TANGENTH.getName());
allFunctions.put(LocalizedEvaluator.TANGENT, LocalizedEvaluator.TANGENT.getName());
allFunctions.put(LocalizedEvaluator.SUM, LocalizedEvaluator.SUM.getName());
allFunctions.put(LocalizedEvaluator.SINEH, LocalizedEvaluator.SINEH.getName());
allFunctions.put(LocalizedEvaluator.SINE, LocalizedEvaluator.SINE.getName());
allFunctions.put(LocalizedEvaluator.ROUND, LocalizedEvaluator.ROUND.getName());
allFunctions.put(LocalizedEvaluator.RANDOM, LocalizedEvaluator.RANDOM.getName());
....
public static ArrayList<String> getVariables(String input) {
for (String operator : allOperators) {
input = input.replace(operator.trim(), "");
}
for (Map.Entry<Function, String> entry : allFunctions.entrySet()) {
String translated = entry.getValue();
input = myReplace(input, translated, "");
}
for (String bracket : allBrackets) {
input = input.replace(bracket.trim(), "");
}
input = input.trim();
String[] words = input.split("\\s+");
ArrayList<String> result = new ArrayList<>();
for (String word : words) {
word = word.trim();
if (!isNumeric(word)) {
//
word = word.replaceAll("\\d", "");
//
result.add(word);
}
}
return result;
}
Trailing operator evaluates incorrectly
Given an expression with a trailing, right-associative operator, the operator may be evaluated incorrectly.
When using the SimpleBooleanEvaluator, an expression like true! resolves to false, but I believe it should result in a syntax error.
Shunting yard algorithm
I myself working on a similar project
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