Pattern Matching
Patterns can match against streams of any objects. There are many primitive pattern expressions that can be combined together to form more complex patterns.
Patterns
| Name | Syntax |
|---|
| And | x y z |
| Or | x | y | z |
| Character | 'x' |
| String | "xyz" |
| Number | 7 or 7.11 or 0xFF |
| Range | "a".."z" or 0..100 |
| Bool | true or false |
| Array | [ x y z ] |
| Object | x { y = z } |
| Any | any |
| Default | default |
| Fail | fail |
| Reference | x or self.x or super.x |
| Variable | x:X |
| Production | x -> y |
- The any keyword matches exactly one of anything in the stream, if the stream is empty it returns fail.
- The default pattern always matches, even if the stream is empty, and consumes nothing from the stream. It is especially useful for the last pattern in an Or clause.