| /** The set of fields needed by an abstract recognizer to recognize input |
| * and recover from errors etc... As a separate state object, it can be |
| * shared among multiple grammars; e.g., when one grammar imports another. |
| * |
| * These fields are publically visible but the actual state pointer per |
| * parser is protected. |
| */ |
| org.antlr.runtime.RecognizerSharedState = function() { |
| /** 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 = []; |
| |
| this._fsp = -1; |
| |
| /** 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; |
| |
| /** The character position of first character within the line */ |
| // this.tokenStartCharPositionInLine; |
| |
| /** The channel number for the current token */ |
| // this.channel; |
| |
| /** The token type for the current token */ |
| // this.type; |
| |
| /** 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; |
| }; |