gnodet-bot commented on code in PR #26824:
URL: https://github.com/apache/camel/pull/26824#discussion_r4091101600
##########
core/camel-core-languages/src/main/java/org/apache/camel/language/simple/ast/BinaryExpression.java:
##########
@@ -58,10 +59,36 @@ public String toString() {
}
public boolean acceptLeftNode(SimpleNode lef) {
+ if (lef instanceof UnaryExpression unary && unary.getOperator() ==
UnaryOperatorType.NOT) {
+ // ! negates a function, not a comparison: !${body} == 'x' would
read as neither of the two things it
+ // could mean, so it is refused and the negated operator is
offered instead (CAMEL-24984)
+ throw new SimpleParserException(
+ "! cannot be compared: it negates a function, so negate
the operator instead, e.g. "
+ + operator.toString().replace("=",
"!=") + " or write "
+ + "${" + "..." + "} " +
negatedOperator() + " value",
Review Comment:
**Bug in error message for `==` operator.**
`operator.toString().replace("=", "!=")` replaces every `=` character
independently, so `"==".replace("=", "!=")` produces `"!=!="` instead of
`"!="`. The error message for `!${body} == 'x'` would read:
```
! cannot be compared: it negates a function, so negate the operator instead,
e.g. !=!= or write ${...} != value
```
`negatedOperator()` already exists in this class and returns the correct
string — use it for both occurrences.
```suggestion
"! cannot be compared: it negates a function, so negate
the operator instead, e.g. "
+ negatedOperator() + " or write
"
+ "${" + "..." + "} " +
negatedOperator() + " value",
```
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