Compound Grammar Indexing
It is possible to
index a compound grammar like an array in order to reference a single grammar
contained in the compound grammar. This is done using the
[]
operator as when indexing an array, whether the compound grammar is represented
with the
|| operator or the grammar is from the grammar
repository that results in a compound grammar.
If the supplied
index is out of bounds, a parse time or an evaluation time
ExpressionArrayIndexOutOfBoundsException might be
thrown as a result. If the grammar being indexed does not represent a compound
grammar, then an
ExpressionClassCastException
is thrown.
Examples of compound grammar indexing expressions that all result in grammar expressions are shown in Table 5-1.
|
1 |
G[grammar.tgl][1] |
|
2 |
(G[grammar1.digit] || G[grammar2.grxml])[0] |
|
3 |
((DG[dtmf-1|word=true] || G[grammar.tgl) || GG[hello|dtmf-3])[0][1] |