toml: fix scanner floating point detection (#18062)

vlib/toml/scanner/scanner.v

@@ -591,6 +591,20 @@ fn (mut s Scanner) extract_number() !string {
 	s.col++
 	for s.pos < s.text.len {
 		c = s.at()
+		// Adjust scanner position to floating point numbers
+		mut i, mut float_precision := 1, 0
+		for c_ := u8(s.peek(i)); c_ != scanner.end_of_text && c_ != `\n`; c_ = u8(s.peek(i)) {
+			if !c_.is_digit() && c_ != `.` && c_ != `,` {
+				float_precision = 0
+				break
+			}
+			if c_.is_digit() && c == `.` {
+				float_precision++
+			}
+			i++
+		}
+		s.pos += float_precision
+		s.col += float_precision
 		// Handle signed exponent notation. I.e.: 3e2, 3E2, 3e-2, 3E+2, 3e0, 3.1e2, 3.1E2, -1E-1
 		if c in [`e`, `E`] && s.peek(1) in [`+`, `-`] && u8(s.peek(2)).is_digit() {
 			s.pos += 2

vlib/toml/tests/reflect_test.v

@@ -18,6 +18,13 @@ bools = [true, false, true, true]
 
 floats = [0.0, 1.0, 2.0, 3.0]
 
+floats_br = [
+  0.0,
+  1.05,
+  2.025,
+  3.5001
+]
+
 int_map = {"a" = 0, "b" = 1, "c" = 2, "d" = 3}
 
 [bio]
@@ -44,14 +51,15 @@ struct Bio {
 }
 
 struct User {
-	name     string
-	age      int
-	height   f64
-	birthday toml.Date
-	strings  []string
-	bools    []bool
-	floats   []f32
-	int_map  map[string]int
+	name      string
+	age       int
+	height    f64
+	birthday  toml.Date
+	strings   []string
+	bools     []bool
+	floats    []f32
+	floats_br []f32
+	int_map   map[string]int
 
 	config toml.Any
 mut:
@@ -73,6 +81,7 @@ fn test_reflect() {
 	assert user.strings == ['v matures', 'like rings', 'spread in the', 'water']
 	assert user.bools == [true, false, true, true]
 	assert user.floats == [f32(0.0), 1.0, 2.0, 3.0]
+	assert user.floats_br == [f32(0.0), 1.05, 2.025, 3.5001]
 	assert user.int_map == {
 		'a': 0
 		'b': 1