Documentation for method
parse assembled from the following types:
method parse(, : = 'TOP', Capture() : = \(), Mu : = Mu, *)
$target, which will be coerced to Str if it isn't one, using
$rule as the starting rule. Additional
$args will be passed to the starting rule if provided.
say RepeatChar.parse('aaaaaa', :rule('start'), :args(\('a')));say RepeatChar.parse('bbbbbb', :rule('start'), :args(\('b')));# OUTPUT:# ｢aaaaaa｣# ｢bbbbbb｣
actions named argument is provided, it will be used as an actions object, that is, for each successful regex match, a method of the same name, if it exists, is called on the actions object, passing the match object as the sole positional argument.
my = class ;grammar .parse('ab', :);# OUTPUT: «42␤7␤»
Additional named arguments are used as options for matching, so you can for example specify things like
:pos(4) to start parsing from the fifth (:pos is zero-based) character. All matching adverbs are allowed, but not all of them take effect. There are several types of adverbs that a regex can have, some of which apply at compile time, like
:i. You cannot pass those to
.parse, because the regexes have already been compiled. But, you can pass those adverbs that affect the runtime behavior, such as
say RepeatChar.parse('bbbbbb', :rule('start'), :args(\('b')), :pos(4)).Str;# OUTPUT: «bb␤»
parse only succeeds if the cursor has arrived at the end of the target string when the match is over. Use method subparse if you want to be able to stop in the middle.
The top regex in the grammar will be allowed to backtrack.