feat: functional options pattern

pkg/saccharine/scan.go

@@ -3,19 +3,20 @@ package saccharine
 import "git.maximhutz.com/max/lambda/pkg/token"
 
 // scanner is the declarative lexer for the Saccharine language.
-var scanner = token.NewScanner[TokenType]().
-	On(`:=`, TokenAssign, 1).
-	On(`\(`, TokenOpenParen, 0).
-	On(`\)`, TokenCloseParen, 0).
-	On(`\{`, TokenOpenBrace, 0).
-	On(`\}`, TokenCloseBrace, 0).
-	On(`;`, TokenHardBreak, 0).
-	On(`\n`, TokenSoftBreak, 0).
-	On(`\\`, TokenSlash, 0).
-	On(`\.`, TokenDot, 0).
-	On(`[a-zA-Z0-9_]+`, TokenAtom, 0).
-	Skip(`#[^\n]*`, 0).
-	Skip(`[^\S\n]+`, 0)
+var scanner = token.NewScanner(
+	token.On(`:=`, TokenAssign, 1),
+	token.On(`\(`, TokenOpenParen, 0),
+	token.On(`\)`, TokenCloseParen, 0),
+	token.On(`\{`, TokenOpenBrace, 0),
+	token.On(`\}`, TokenCloseBrace, 0),
+	token.On(`;`, TokenHardBreak, 0),
+	token.On(`\n`, TokenSoftBreak, 0),
+	token.On(`\\`, TokenSlash, 0),
+	token.On(`\.`, TokenDot, 0),
+	token.On(`[a-zA-Z0-9_]+`, TokenAtom, 0),
+	token.Skip[TokenType](`#[^\n]*`, 0),
+	token.Skip[TokenType](`[^\S\n]+`, 0),
+)
 
 // scan tokenizes a string into Saccharine tokens.
 func scan(input string) ([]Token, error) {