| /** A parser for a stream of tree nodes. "tree grammars" result in a subclass |
| * of this. All the error reporting and recovery is shared with Parser via |
| * the BaseRecognizer superclass. |
| */ |
| org.antlr.runtime.tree.TreeParser = function(input) { |
| org.antlr.runtime.tree.TreeParser.superclass.constructor.call(this, arguments[1]); |
| this.setTreeNodeStream(input); |
| }; |
| |
| (function(){ |
| var TP = org.antlr.runtime.tree.TreeParser; |
| |
| org.antlr.lang.augmentObject(TP, { |
| DOWN: org.antlr.runtime.Token.DOWN, |
| UP: org.antlr.runtime.Token.UP |
| }); |
| |
| org.antlr.lang.extend(TP, org.antlr.runtime.BaseRecognizer, { |
| reset: function() { |
| TP.superclass.reset.call(this); // reset all recognizer state variables |
| if ( this.input ) { |
| this.input.seek(0); // rewind the input |
| } |
| }, |
| |
| /** Set the input stream */ |
| setTreeNodeStream: function(input) { |
| this.input = input; |
| }, |
| |
| getTreeNodeStream: function() { |
| return this.input; |
| }, |
| |
| getSourceName: function() { |
| return this.input.getSourceName(); |
| }, |
| |
| getCurrentInputSymbol: function(input) { |
| return input.LT(1); |
| }, |
| |
| getMissingSymbol: function(input, e, expectedTokenType, follow) { |
| var tokenText = |
| "<missing "+this.getTokenNames()[expectedTokenType]+">"; |
| return new org.antlr.runtime.tree.CommonTree(new org.antlr.runtime.CommonToken(expectedTokenType, tokenText)); |
| }, |
| |
| /** Match '.' in tree parser has special meaning. Skip node or |
| * entire tree if node has children. If children, scan until |
| * corresponding UP node. |
| */ |
| matchAny: function(ignore) { // ignore stream, copy of this.input |
| this.state.errorRecovery = false; |
| this.state.failed = false; |
| var look = this.input.LT(1); |
| if ( this.input.getTreeAdaptor().getChildCount(look)===0 ) { |
| this.input.consume(); // not subtree, consume 1 node and return |
| return; |
| } |
| // current node is a subtree, skip to corresponding UP. |
| // must count nesting level to get right UP |
| var level=0, |
| tokenType = this.input.getTreeAdaptor().getType(look); |
| while ( tokenType!==org.antlr.runtime.Token.EOF && |
| !(tokenType===TP.UP && level===0) ) |
| { |
| this.input.consume(); |
| look = this.input.LT(1); |
| tokenType = this.input.getTreeAdaptor().getType(look); |
| if ( tokenType === TP.DOWN ) { |
| level++; |
| } |
| else if ( tokenType === TP.UP ) { |
| level--; |
| } |
| } |
| this.input.consume(); // consume UP |
| }, |
| |
| /** We have DOWN/UP nodes in the stream that have no line info; override. |
| * plus we want to alter the exception type. Don't try to recover |
| * * from tree parser errors inline... |
| */ |
| mismatch: function(input, ttype, follow) { |
| throw new org.antlr.runtime.MismatchedTreeNodeException(ttype, input); |
| }, |
| |
| /** Prefix error message with the grammar name because message is |
| * always intended for the programmer because the parser built |
| * the input tree not the user. |
| */ |
| getErrorHeader: function(e) { |
| return this.getGrammarFileName()+": node from "+ |
| (e.approximateLineInfo?"after ":"")+"line "+e.line+":"+e.charPositionInLine; |
| }, |
| |
| /** Tree parsers parse nodes they usually have a token object as |
| * payload. Set the exception token and do the default behavior. |
| */ |
| getErrorMessage: function(e, tokenNames) { |
| var adaptor; |
| if ( this instanceof TP ) { |
| adaptor = e.input.getTreeAdaptor(); |
| e.token = adaptor.getToken(e.node); |
| if ( !org.antlr.lang.isValue(e.token) ) { // could be an UP/DOWN node |
| e.token = new org.antlr.runtime.CommonToken( |
| adaptor.getType(e.node), |
| adaptor.getText(e.node)); |
| } |
| } |
| return TP.superclass.getErrorMessage.call(this, e, tokenNames); |
| }, |
| |
| traceIn: function(ruleName, ruleIndex) { |
| TP.superclass.traceIn.call(this, ruleName, ruleIndex, this.input.LT(1)); |
| }, |
| |
| traceOut: function(ruleName, ruleIndex) { |
| TP.superclass.traceOut.call(this, ruleName, ruleIndex, this.input.LT(1)); |
| } |
| }); |
| |
| })(); |