IssueTracker

-- Issue description (short summary) --

When using two flow variables with the OR operator inside $sys.func.IF(), an unexpected character error occurs at the position where OR starts. This happens even though both flow variables contain boolean values.

✅ Works:

"$sys.func.IF(true OR true, \"Valid\", \"Invalid\")"

"$sys.func.IF(true OR $flow.a, \"Valid\", \"Invalid\")"

❌ Fails:

"$sys.func.IF($flow.a OR $flow.a, \"Valid\", \"Invalid\")"

(Throws an unexpected character error at the position where OR starts.)

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-- Steps to reproduce the issue (detailed description) --

1. Create a Dialogflow CX agent and define a boolean flow variable, $flow.a.
2. Set $flow.a = true.
3. Use the following condition inside an expression:

   "$sys.func.IF($flow.a OR $flow.a, \"Valid\", \"Invalid\")"
   

4. Observe that it produces an error.

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-- Expected behavior --

• The expression should evaluate correctly and return "Valid" if $flow.a is true.
• The OR operator should work consistently with both constants (true/false) and flow variables.

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-- Actual behavior --

• Unexpected character error occurs at the position where OR starts.
• The system does not allow using two flow variables with OR, despite both being boolean.
• This issue is inconsistent because using a mix of a constant (true) and a flow variable works fine.

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-- Workarounds (if any) --

• Using a constant (true OR $flow.a) works, but this is not useful for dynamic expressions.
• Using separate conditions instead of OR may be required, but this is not ideal.

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-- Documentation consulted --

• Dialogflow CX Conditions Reference
• The documentation states that OR should work with boolean values but does not mention any restrictions on flow variables.

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-- Other information --

• The issue appears to be a parsing bug when using two flow variables with OR.
• Tested in different CX environments, and the behavior is consistent.