BUG: Undefined operator '.' ParseException when letter 'e' is after dot '.'

[atomiechen]

A weired issue. When I tried the official example (both in document and README link), and changed the field name id to environment_id, I encountered ParseException of Undefined operator '.'.

Environment:

• macOS Monterey 12.5.1 (21G83)
• Android Studio Dolphin | 2021.3.1 Patch 1
• junit test
• dependency implementation 'com.ezylang:EvalEx:3.0.2'

Code:

public class EvalExTest {
    @Test
    public void test() throws EvaluationException, ParseException {
        Map<String, Object> order = new HashMap<>();
        order.put("environment_id", 12345);
        
        Expression expression = new Expression("order.environment_id")
                .with("order", order);
        
        BigDecimal result = expression.evaluate().getNumberValue();  // ParseException: Undefined operator '.'
        
        System.out.println(result);
    }
}

Result:

Undefined operator '.'
ParseException(super=BaseException(startPosition=6, endPosition=6, tokenString=., message=Undefined operator '.'))
	at app//com.ezylang.evalex.parser.Tokenizer.parseOperator(Tokenizer.java:253)
	at app//com.ezylang.evalex.parser.Tokenizer.getNextToken(Tokenizer.java:165)
	at app//com.ezylang.evalex.parser.Tokenizer.parse(Tokenizer.java:84)
	at app//com.ezylang.evalex.Expression.getAbstractSyntaxTree(Expression.java:235)
	at app//com.ezylang.evalex.Expression.evaluate(Expression.java:85)
...

So far I found that any field name that follows the dot '.' and starts with 'e' will make this error, with a few exceptions:

• failed examples: order.e, context.e, context.environment_id, var.e, variabl.e, variablew.e, etc.
• exceptionally passed examples: variable as the structure name will not issue this exception, like variable.e, variable.environment_id, etc.
• normal passed examples: from order.a to order.z except order.e; from variable.a to variable.z

[uklimaschewski]

Thank you very much for the bug report. Version 3.0.3 of EvalEx has been released and fixes this bug.

[atomiechen]

That is really quick! Thank you!