diff options
Diffstat (limited to 'driver/semantic_action.go')
| -rw-r--r-- | driver/semantic_action.go | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/driver/semantic_action.go b/driver/semantic_action.go index b31c35b..421a722 100644 --- a/driver/semantic_action.go +++ b/driver/semantic_action.go @@ -10,8 +10,8 @@ import ( type SemanticActionSet interface { // Shift runs when the driver shifts a symbol onto the state stack. `tok` is a token corresponding to - // the symbol. - Shift(tok *mldriver.Token) + // the symbol. When the driver recovered from an error state by shifting the token, `recovered` is true. + Shift(tok *mldriver.Token, recovered bool) // Shift runs when the driver shifts a symbol onto the state stack. `tok` is a token corresponding to // the symbol. This function doesn't take a token as an argument because a token corresponding to @@ -19,8 +19,9 @@ type SemanticActionSet interface { ShiftError() // Reduce runs when the driver reduces an RHS of a production to its LHS. `prodNum` is a number of - // the production. - Reduce(prodNum int) + // the production. When the driver recovered from an error state by reducing the production, + // `recovered` is true. + Reduce(prodNum int, recovered bool) // Accept runs when the driver accepts an input. Accept() @@ -96,7 +97,7 @@ func NewSyntaxTreeActionSet(gram *spec.CompiledGrammar, makeAST bool, makeCST bo } } -func (a *SyntaxTreeActionSet) Shift(tok *mldriver.Token) { +func (a *SyntaxTreeActionSet) Shift(tok *mldriver.Token, recovered bool) { term := a.tokenToTerminal(tok) var ast *Node @@ -146,7 +147,7 @@ func (a *SyntaxTreeActionSet) ShiftError() { }) } -func (a *SyntaxTreeActionSet) Reduce(prodNum int) { +func (a *SyntaxTreeActionSet) Reduce(prodNum int, recovered bool) { lhs := a.gram.ParsingTable.LHSSymbols[prodNum] // When an alternative is empty, `n` will be 0, and `handle` will be empty slice. |