In this case IF and THEN are terminal symbols, meaning " a token of type IF or THEN, respectively " and due to the lexical grammar, this means the string if or then in the original source.
32.
Predictive parsers can be depicted using transition diagrams for each non-terminal symbol where the edges between the initial and the final states are labelled by the symbols ( terminals and non-terminals ) of the right side of the production rule.
33.
For each nonterminal S, the SLR generator works out Follows ( S ), the set of all the terminal symbols which can immediately follow some occurrence of S . In the parse table, each reduction to S uses Follow ( S ) as its LR ( 1 ) lookahead set.
34.
"' ?" "'is a special pseudo-terminal symbol mechanically added to the grammar, just as is a special pseudo-nonterminal symbol mechanically added to the grammar ( if the programmer did not explicitly include in the grammar, then would be automatically added to the grammar on the programmer's behalf ).
35.
The presence of a dot, ", in a configuration represents the current lookahead position, with the lookahead symbol shown to the right of the dot ( and which " always " corresponds to a terminal symbol ), and the current stack state to the left of the dot ( and which " usually " corresponds to a nonterminal symbol ).
36.
This presents an opportunity to invoke an error recovery procedure, perhaps, in its most simplistic form, to discard the lookahead terminal symbol and to read the next terminal symbol, but many other programmed actions are possible, including pruning the stack, or discarding the lookahead terminal symbol " and " pruning the stack ( and in a pathological case, it is usually possible to obtain
37.
This presents an opportunity to invoke an error recovery procedure, perhaps, in its most simplistic form, to discard the lookahead terminal symbol and to read the next terminal symbol, but many other programmed actions are possible, including pruning the stack, or discarding the lookahead terminal symbol " and " pruning the stack ( and in a pathological case, it is usually possible to obtain
38.
This presents an opportunity to invoke an error recovery procedure, perhaps, in its most simplistic form, to discard the lookahead terminal symbol and to read the next terminal symbol, but many other programmed actions are possible, including pruning the stack, or discarding the lookahead terminal symbol " and " pruning the stack ( and in a pathological case, it is usually possible to obtain
39.
Re " write rules of a "'DCPSG "'are identical to those of a CFG, with the addition of a meta-symbol, denoted here as an underscore . " DCPSG " rules therefore have the general form X \ to \ alpha where \ alpha is a string of terminal symbols and / or non-terminal symbols and at most one underscore.
40.
Re " write rules of a "'DCPSG "'are identical to those of a CFG, with the addition of a meta-symbol, denoted here as an underscore . " DCPSG " rules therefore have the general form X \ to \ alpha where \ alpha is a string of terminal symbols and / or non-terminal symbols and at most one underscore.
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