lexers.php_sm

Hand-written PHP lexer using composable scanner mixins.

O(n) guaranteed, zero regex, thread-safe.

Language Support:

• PHP 8.x syntax
• Opening tags (<?php,<?=,<?), closing tags (?>)
• Here-documents (<<<EOF) and now-documents (<<<'EOF')
• Variables ($var,$$var)
• Namespaces (namespace,use)
• Attributes (#[Attribute])
• Enums, match expressions, named arguments
• All C-style syntax (inherited from mixins)

Special Handling:

PHP can be embedded in HTML, so the lexer handles:

• Opening tags:<?phpstarts PHP mode
• Closing tags:?>ends PHP mode
• Short echo:<?=for inline output

Variables always start with$and can be variable-variables ($$var).

Performance:

~55µs per 100-line file.

Thread-Safety:

All lookup tables are frozen sets.

See Also:

• rosettes.lexers.html_sm: HTML lexer (PHP often embedded)
• rosettes.lexers.javascript_sm: Similar C-style syntax