Initial support for PHP 8.5 Pipe Operator

[cseufert]

I think this should work, not sure how smart we should be about rejecting non-callables in right side of pipeline operator.

[Copilot]

Pull Request Overview

This PR adds initial support for PHP 8.5's pipe operator (|>) to the parser. The implementation allows chaining expressions using the pipe operator syntax, enabling functional programming patterns where the output of one expression becomes the input to the next.

• Adds lexer support for recognizing the |> token sequence
• Implements parser logic to handle pipe operator expressions as binary operations
• Includes version checking to ensure PHP 8.5+ requirement is enforced

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/tokens.js	Defines the new T_PIPE token constant
src/lexer/tokens.js	Adds lexer logic to recognize `
src/parser/expr.js	Implements pipe operator parsing with version validation
test/snapshot/pipe.test.js	Adds test case for basic pipe operator functionality
test/snapshot/__snapshots__/pipe.test.js.snap	Generated snapshot for pipe operator test

[Copilot]

[nitpick] The comment placement is inconsistent with the existing code structure. This comment should be moved to line 124 to directly precede the pipe operator implementation, matching the pattern used for other operators like the coalesce operator.

Suggested change

	// extra operations :
	// $a = "Hi" |> strtoupper(...);
	if (this.token === this.tok.T_PIPE) {
	if (this.token === this.tok.T_PIPE) {
	// extra operations :
	// $a = "Hi" |> strtoupper(...);