// simulates rule entry for left-recursive rules
public virtual void UnrollRecursionContexts(ParserRuleContext _parentctx)
{
_precedenceStack.RemoveAt(_precedenceStack.Count - 1);
_ctx.stop = _input.Lt(-1);
ParserRuleContext retctx = _ctx;
// save current ctx (return value)
// unroll so _ctx is as it was before call to recursive method
if (_parseListeners != null)
{
while (_ctx != _parentctx)
{
TriggerExitRuleEvent();
_ctx = (ParserRuleContext)_ctx.parent;
}
}
else
{
_ctx = _parentctx;
}
// hook into tree
retctx.parent = _parentctx;
if (_buildParseTrees && _parentctx != null)
{
// add return ctx into invoking rule's tree
_parentctx.AddChild(retctx);
}
}
/// <summary>
/// Consume and return the
/// <linkplain>
/// #getCurrentToken
/// current symbol
/// </linkplain>
/// .
/// <p>E.g., given the following input with
/// <code>A</code>
/// being the current
/// lookahead symbol, this function moves the cursor to
/// <code>B</code>
/// and returns
/// <code>A</code>
/// .</p>
/// <pre>
/// A B
/// ^
/// </pre>
/// If the parser is not in error recovery mode, the consumed symbol is added
/// to the parse tree using
/// <see cref="ParserRuleContext.AddChild(IToken)">ParserRuleContext.AddChild(IToken)</see>
/// , and
/// <see cref="Antlr4.Runtime.Tree.IParseTreeListener.VisitTerminal(Antlr4.Runtime.Tree.ITerminalNode)">Antlr4.Runtime.Tree.IParseTreeListener.VisitTerminal(Antlr4.Runtime.Tree.ITerminalNode)</see>
/// is called on any parse listeners.
/// If the parser <em>is</em> in error recovery mode, the consumed symbol is
/// added to the parse tree using
/// <see cref="ParserRuleContext.AddErrorNode(IToken)">ParserRuleContext.AddErrorNode(IToken)</see>
/// , and
/// <see cref="Antlr4.Runtime.Tree.IParseTreeListener.VisitErrorNode(Antlr4.Runtime.Tree.IErrorNode)">Antlr4.Runtime.Tree.IParseTreeListener.VisitErrorNode(Antlr4.Runtime.Tree.IErrorNode)</see>
/// is called on any parse
/// listeners.
/// </summary>
public virtual IToken Consume()
{
IToken o = CurrentToken;
if (o.Type != Eof)
{
((ITokenStream)InputStream).Consume();
}
bool hasListener = _parseListeners != null && _parseListeners.Count != 0;
if (_buildParseTrees || hasListener)
{
if (_errHandler.InErrorRecoveryMode(this))
{
IErrorNode node = _ctx.AddErrorNode(o);
if (_parseListeners != null)
{
foreach (IParseTreeListener listener in _parseListeners)
{
listener.VisitErrorNode(node);
}
}
}
else
{
ITerminalNode node = _ctx.AddChild(o);
if (_parseListeners != null)
{
foreach (IParseTreeListener listener in _parseListeners)
{
listener.VisitTerminal(node);
}
}
}
}
return o;
}
protected internal virtual void AddContextToParseTree()
{
ParserRuleContext parent = (ParserRuleContext)_ctx.parent;
// add current context to parent if we have a parent
if (parent != null)
{
parent.AddChild(_ctx);
}
}
public virtual void EnterOuterAlt(ParserRuleContext localctx, int altNum)
{
// if we have new localctx, make sure we replace existing ctx
// that is previous child of parse tree
if (_buildParseTrees && _ctx != localctx)
{
ParserRuleContext parent = (ParserRuleContext)_ctx.parent;
if (parent != null)
{
parent.RemoveLastChild();
parent.AddChild(localctx);
}
}
_ctx = localctx;
}
// simulates rule entry for left-recursive rules
/// <summary>
/// Like
/// <see cref="EnterRule(ParserRuleContext, int, int)">EnterRule(ParserRuleContext, int, int)</see>
/// but for recursive rules.
/// </summary>
public virtual void PushNewRecursionContext(ParserRuleContext localctx, int state, int ruleIndex)
{
ParserRuleContext previous = _ctx;
previous.parent = localctx;
previous.invokingState = state;
previous.stop = _input.Lt(-1);
_ctx = localctx;
_ctx.start = previous.start;
if (_buildParseTrees)
{
_ctx.AddChild(previous);
}
if (_parseListeners != null)
{
TriggerEnterRuleEvent();
}
}
public virtual void EnterLeftFactoredRule(ParserRuleContext localctx, int state, int ruleIndex)
{
State = state;
if (_buildParseTrees)
{
ParserRuleContext factoredContext = (ParserRuleContext)_ctx.GetChild(_ctx.ChildCount - 1);
_ctx.RemoveLastChild();
factoredContext.parent = localctx;
localctx.AddChild(factoredContext);
}
_ctx = localctx;
_ctx.start = _input.Lt(1);
if (_buildParseTrees)
{
AddContextToParseTree();
}
if (_parseListeners != null)
{
TriggerEnterRuleEvent();
}
}
