1 files changed, 16 insertions, 0 deletions
diff --git a/vendor/pest_derive/examples/calc.pest b/vendor/pest_derive/examples/calc.pest
new file mode 100644
index 000000000..9f2cc3b74
--- /dev/null
+++ b/vendor/pest_derive/examples/calc.pest
@@ -0,0 +1,16 @@
+WHITESPACE   =  _{ " " | "\t" | NEWLINE }
+
+ program      =   { SOI ~ expr ~ EOI }
+   expr       =   { prefix* ~ primary ~ postfix* ~ (infix ~ prefix* ~ primary ~ postfix* )* }
+     infix    =  _{ add | sub | mul | div | pow }
+       add    =   { "+" } // Addition
+       sub    =   { "-" } // Subtraction
+       mul    =   { "*" } // Multiplication
+       div    =   { "/" } // Division
+       pow    =   { "^" } // Exponentiation
+     prefix   =  _{ neg }
+       neg    =   { "-" } // Negation
+     postfix  =  _{ fac }
+       fac    =   { "!" } // Factorial
+     primary  =  _{ int | "(" ~ expr ~ ")" }
+       int    =  @{ (ASCII_NONZERO_DIGIT ~ ASCII_DIGIT+ | ASCII_DIGIT) }
+\ No newline at end of file