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Record in parse table which actions can hide splits

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Suppose a parse state S has multiple actions for a terminal lookahead symbol A.
Then during incremental parsing, while in state S, the parser should not
reuse a non-terminal lookahead B where FIRST(B) contains A, because reusing B
might prematurely discard one of the possible actions that a batch parser
would have attempted in state S, upon seeing A as a lookahead.
This commit is contained in:
Max Brunsfeld 2015-12-17 12:48:55 -08:00
parent 7fbb628c78
commit c495076adb
19 changed files with 58613 additions and 60661 deletions
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5
spec/compiler/helpers/stream_methods.cc
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@ -74,11 +74,6 @@ ostream &operator<<(ostream &stream, const ParseAction &action) {
case ParseActionTypeShift:
return stream << string("#<shift state:") << to_string(action.state_index) <<
string(" precedence:") << action.precedence_range << ">";
case ParseActionTypeShiftExtra:
return stream << string("#<shift_extra");
case ParseActionTypeReduceExtra:
return stream << "#<reduce_extra sym:" << action.symbol <<
string(" precedence:") << to_string(action.precedence_range.min) << ">";
case ParseActionTypeReduce:
return stream << ("#<reduce sym" + to_string(action.symbol.index) + " " +
to_string(action.consumed_symbol_count) + ">");