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<?php
class RecognizerSharedState {
public function __construct(){
/** Track the set of token types that can follow any rule invocation.
* Stack grows upwards. When it hits the max, it grows 2x in size
* and keeps going.
*/
$this->following = array(); //Should be an array of bitsets
$this->_fsp = -1;
//public BitSet[] following = new BitSet[BaseRecognizer.INITIAL_FOLLOW_STACK_SIZE];
/** This is true when we see an error and before having successfully
* matched a token. Prevents generation of more than one error message
* per error.
*/
$this->errorRecovery = false;
/** The index into the input stream where the last error occurred.
* This is used to prevent infinite loops where an error is found
* but no token is consumed during recovery...another error is found,
* ad naseum. This is a failsafe mechanism to guarantee that at least
* one token/tree node is consumed for two errors.
*/
$this->lastErrorIndex = -1;
/** In lieu of a return value, this indicates that a rule or token
* has failed to match. Reset to false upon valid token match.
*/
$this->failed=false;
/** Did the recognizer encounter a syntax error? Track how many. */
$this->syntaxErrors=0;
/** If 0, no backtracking is going on. Safe to exec actions etc...
* If >0 then it's the level of backtracking.
*/
$this->backtracking = 0;
/** An array[size num rules] of Map<Integer,Integer> that tracks
* the stop token index for each rule. ruleMemo[ruleIndex] is
* the memoization table for ruleIndex. For key ruleStartIndex, you
* get back the stop token for associated rule or MEMO_RULE_FAILED.
*
* This is only used if rule memoization is on (which it is by default).
*/
$this->ruleMemo = null;
// LEXER FIELDS (must be in same state object to avoid casting
// constantly in generated code and Lexer object) :(
/** The goal of all lexer rules/methods is to create a token object.
* This is an instance variable as multiple rules may collaborate to
* create a single token. nextToken will return this object after
* matching lexer rule(s). If you subclass to allow multiple token
* emissions, then set this to the last token to be matched or
* something nonnull so that the auto token emit mechanism will not
* emit another token.
*/
$this->token = null;
/** What character index in the stream did the current token start at?
* Needed, for example, to get the text for current token. Set at
* the start of nextToken.
*/
$this->tokenStartCharIndex = -1;
/** The line on which the first character of the token resides */
$this->tokenStartLine = 0;
/** The character position of first character within the line */
$this->tokenStartCharPositionInLine = 0;
/** The channel number for the current token */
$this->channel = 0;
/** The token type for the current token */
$this->type = 0;
/** You can set the text for the current token to override what is in
* the input char buffer. Use setText() or can set this instance var.
*/
$this->text=null;
}
}
?>