1 files changed, 46 insertions, 37 deletions
diff --git a/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go b/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go
index fc3baf608..8427cb4ac 100644
--- a/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go
+++ b/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go
@@ -4,60 +4,69 @@ import (
 	"math"
 )
 
+// ParseDecimal parses number of the format 1.2
 func ParseDecimal(b []byte) (float64, int) {
+	// float64 has up to 17 significant decimal digits and an exponent in [-1022,1023]
 	i := 0
-	start := i
+	//sign := 1.0
+	//if 0 < len(b) && b[0] == '-' {
+	//	sign = -1.0
+	//	i++
+	//}
+
+	start := -1
 	dot := -1
-	trunk := -1
 	n := uint64(0)
 	for ; i < len(b); i++ {
+		// parse up to 18 significant digits (with dot will be 17) ignoring zeros before/after
 		c := b[i]
 		if '0' <= c && c <= '9' {
-			if trunk == -1 {
-				if math.MaxUint64/10 < n {
-					trunk = i
-				} else {
-					n *= 10
-					n += uint64(c - '0')
+			if start == -1 {
+				if '1' <= c && c <= '9' {
+					n = uint64(c - '0')
+					start = i
 				}
+			} else if i-start < 18 {
+				n *= 10
+				n += uint64(c - '0')
+			}
+		} else if c == '.' {
+			if dot != -1 {
+				break
 			}
-		} else if dot == -1 && c == '.' {
 			dot = i
 		} else {
 			break
 		}
 	}
-	if i == start || i == start+1 && dot == start {
-		return 0.0, 0
+	if i == 1 && dot == 0 {
+		return 0.0, 0 // only dot
+	} else if start == -1 {
+		return 0.0, i // only zeros and dot
+	} else if dot == -1 {
+		dot = i
 	}
 
-	f := float64(n)
-	mantExp := int64(0)
-	if dot != -1 {
-		if trunk == -1 {
-			trunk = i
-		}
-		mantExp = int64(trunk - dot - 1)
-	} else if trunk != -1 {
-		mantExp = int64(trunk - i)
+	exp := (dot - start) - LenUint(n)
+	if dot < start {
+		exp++
+	}
+	if 1023 < exp {
+		return math.Inf(1), i
+		//if sign == 1.0 {
+		//	return math.Inf(1), i
+		//} else {
+		//	return math.Inf(-1), i
+		//}
+	} else if exp < -1022 {
+		return 0.0, i
 	}
-	exp := -mantExp
 
-	// copied from strconv/atof.go
-	if exp == 0 {
-		return f, i
-	} else if 0 < exp && exp <= 15+22 { // int * 10^k
-		// If exponent is big but number of digits is not,
-		// can move a few zeros into the integer part.
-		if 22 < exp {
-			f *= float64pow10[exp-22]
-			exp = 22
-		}
-		if -1e15 <= f && f <= 1e15 {
-			return f * float64pow10[exp], i
-		}
-	} else if exp < 0 && -22 <= exp { // int / 10^k
-		return f / float64pow10[-exp], i
+	f := float64(n) // sign * float64(n)
+	if 0 <= exp && exp < 23 {
+		return f * float64pow10[exp], i
+	} else if 23 < exp && exp < 0 {
+		return f / float64pow10[exp], i
 	}
-	return f * math.Pow10(int(-mantExp)), i
+	return f * math.Pow10(exp), i
 }