Fix/expression space parsing

[ShaneBeee]

Fix expression parsing with space-separated expressions

Problem

Patterns with two expressions separated only by whitespace or optional elements would fail to parse. For example:

Patterns that failed:

• "claude test %number% [of] %number%"
• "location %direction% [of] %location%"

Inputs that didn't work:

• claude test 1 2 ❌
• location above {_loc} ❌

But these worked fine:

• claude test 1 of 2 ✅
• location north of {_loc} ✅

Root Cause

In ExpressionElement.java at lines 135-137, there was an incorrect boundary check:

if (expressionIndex + 1 >= flattened.size()) {
    continue;  // This was wrong!
}

This check would skip processing when the next expression was the last element in the pattern. For a pattern like "claude test %number% [of] %number%", the flattened elements would be:

[0] TextElement("claude test ")
[1] ExpressionElement(%number%)
[2] TextElement(" ")
[3] OptionalGroup([TextElement("of")])
[4] TextElement(" ")
[5] ExpressionElement(%number%)  <- Last element

When matching the first expression, the code would find the second expression at index 5, then check 5 + 1 >= 6 → true, and skip it entirely, causing the match to fail.

Solution

Removed the incorrect boundary check. When an expression is the last element in a pattern, getPossibleInputs() correctly returns [TextElement("\0")] (the end-of-line marker), which is properly handled by the existing code below.

Changes

• Fixed: ExpressionElement.java - Removed incorrect boundary check (lines 135-137)
• Added: ClaudeDebugTest.java - Unit test verifying both space-separated and optional text cases

Testing

The new unit test verifies:

• ✅ claude test 1 2 (space between expressions)
• ✅ claude test 1 of 2 (optional text between expressions)

All existing tests continue to pass.

Related Issues

Fixes issues with parsing expressions that have:

• Two expressions separated only by whitespace
• Optional elements between two expressions
• The second expression being the last element in the pattern
• [BUG] Can't use blank space between 2 expressions #5

---

🤖 This fix was identified and implemented with assistance from Claude Code.

---

You can copy this and use it as your PR description! It provides a clear explanation of the problem, the root cause, and the solution for reviewers.