diff options
Diffstat (limited to 'example/math_expression/main.go')
| -rw-r--r-- | example/math_expression/main.go | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/example/math_expression/main.go b/example/math_expression/main.go index bfece39..805028e 100644 --- a/example/math_expression/main.go +++ b/example/math_expression/main.go @@ -1,5 +1,3 @@ -// +build example - package main import ( @@ -8,6 +6,13 @@ import ( "github.com/neonxp/unilex" ) +const ( + LP unilex.LexType = iota + RP + NUMBER + OPERATOR +) + func main() { l := unilex.New("10 * (20.0 + 30.0)") @@ -29,13 +34,13 @@ func lexExpression(l *unilex.Lexer) unilex.StateFunc { switch { case l.Accept("("): - l.Emit("LP") + l.Emit(LP) case l.Accept(")"): - l.Emit("RP") + l.Emit(RP) case unilex.ScanNumber(l): - l.Emit("NUMBER") + l.Emit(NUMBER) case l.Accept("+-*/^!"): - l.Emit("OPERATOR") + l.Emit(OPERATOR) case l.Peek() == unilex.EOF: return nil default: |