PEG, aka parsing expression grammar, is a grammar language created in 2002.
| #1047on PLDB | 22Years Old |
In computer science, a parsing expression grammar, or PEG, is a type of analytic formal grammar, i.e. it describes a formal language in terms of a set of rules for recognizing strings in the language. The formalism was introduced by Bryan Ford in 2004 and is closely related to the family of top-down parsing languages introduced in the early 1970s. Read more on Wikipedia...
Expr ← Sum
Sum ← Product (('+' / '-') Product)*
Product ← Value (('*' / '/') Value)*
Value ← [0-9]+ / '(' Expr ')'Value ← [0-9.]+ / '(' Expr ')'
Product ← Expr (('*' / '/') Expr)*
Sum ← Expr (('+' / '-') Expr)*
Expr ← Product / Sum / Value| Feature | Supported | Example | Token |
|---|---|---|---|
| Comments | ✓ | ||
| Line Comments | ✓ |