File code/Lexer.php

class Tlf\Lexer

Used to process a string into an Asymmetrical Syntax Tree (AST)

public float $version = \Tlf\Lexer\Versions_old;
public bool $debug = false; set true to show debug messages
public int $loop_count = 0; The loop we're on. 0 means not started. 1 means we're executing the first loop. 2 means 2nd loop, etc.
public bool $useCache = true; Whether to load from & save to the cache or not.
public $token = null; The token currently being processed
protected $grammarListForCache = null; array of grammar class names & their file's last mtime
public $stop_loop = -1; the loop to stop processing on. Used for debugging, when writing a grammar.
public string $signal = null; A string that can be set & checked by handlers, to determine what operations should be completed.

public function abort() stop lexing
public function haltAll()
public function continueAll()
public function haltInstructions()
public function continueInstructions()
public function previous($key)
public function setPrevious($key, $value)
public function appendToPrevious($key, $value)
public function unsetPrevious($key)
public function clearBuffer()
public function getToken()
public function addGrammar(object $grammar, string $namespace=null, $executeOnAddtrue)
public function getGrammar(string $namespace)
public function setHead($ast) Append an ast to top of stack.
public function popHead(): \Tlf\Lexer\Ast Get top-level ast and remove it from the stack. If only one ast, then return it and leave at bottom of stack.
public function getHead(): \Tlf\Lexer\Ast Get top-level AST from stack.

See Internals::$head

See Internals::$head

public function lexFile($file): \Tlf\Lexer\Ast Create a 'file' ast & call 'lexAst'. Asts generated by this function are cached. Chache is invalidated when the source of the active grammars or the file being processed changes.