Add support for l (long) length modifier

[Copilot]

PHP parses but ignores the l length modifier (e.g. %ld, %ls, %10lf). The parser did not recognise it, causing these format strings to produce invalid lexemes.

Changes

• ArgumentLexeme — new $longModifier bool property (constructor param defaulting to false), exposed via getLongModifier(): bool
• Parser — detects l immediately before the type specifier in lexSprintf; consumed and stored as the long modifier flag. A bare l with no valid type following (e.g. %lls) still yields an invalid lexeme
• Printer — emits l before the type character when getLongModifier() is true, preserving round-trip fidelity
• Tests — serialisation updated to append |long:1 when present; new cases cover %ld, %ls, %lf, %10lf, %.5lf, %10.5lf, %1$ld, %-10ld, and the invalid %lls

Example

$parser->parseStr('%10lf');
// ArgumentLexeme: type=f, padWidth=10, longModifier=true

$printer->print($lexemes); // → '%10lf'

[donatj]

@copilot Can we change the serialization to just |l instead of |long:1

[Copilot]

@copilot Can we change the serialization to just |l instead of |long:1

Done in c499fc3 — changed |long:1 to |l throughout the serialization helper and all test expectations.

[Copilot]

Pull request overview

Adds first-class parsing/printing support for the l (long) length modifier in printf-format argument lexemes, so formats like %ld, %ls, and %10lf no longer produce invalid lexemes and can round-trip through parse → print.

Changes:

• Extend ArgumentLexeme with a longModifier flag and accessor.
• Update Parser::lexSprintf to recognize and consume l immediately before the type specifier.
• Update Printer to emit l when present; extend integration tests to cover valid/invalid l cases.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
test/Integration/ParserTest.php	Serializes and asserts l-modifier behavior; adds new parse/print cases including %lls invalid handling.
src/Printer.php	Emits l before the type character when the parsed lexeme indicates the modifier.
src/Parser.php	Detects l just before type and stores it on the emitted ArgumentLexeme.
src/ArgumentLexeme.php	Adds longModifier state + getLongModifier() to preserve modifier for round-trip fidelity.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.