PCT::Grammar - base grammar with useful rules
grammar MyGrammar is PCT::Grammar;
rule abc { [ word | <panic: word not found> ] }
rule quote {
[ \' <string_literal: '> \'
| \" <string_literal: "> \"
]
}
This file implements PCT::Grammar, which is a basic grammar object with a few useful methods for parsing thrown in.
Throws an exception at the current point of the match, with message as part of the exception payload. The message doesn't end with a newline, then the line number and offset of the match are also included.
Invoked when goal matching fails to find the goal. Builds an appropriate error message and delegates the rest to panic.
Here we overload the item() method from PGE::Match to throw an exception if a result object hasn't been set.
Special-purpose rule to return true if we're in the middle of a word -- i.e., if the previous and next character are both "word characters". This is roughly equivalent to <?after \w><?before \w> except it's much quicker. In particular, <!ww> can be used by :sigspace rules to enforce whitespace between lexical words.
