1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go b/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go
new file mode 100644
index 000000000..fc3baf608
--- /dev/null
+++ b/vendor/github.com/tdewolff/parse/v2/strconv/decimal.go
@@ -0,0 +1,63 @@
+package strconv
+
+import (
+	"math"
+)
+
+func ParseDecimal(b []byte) (float64, int) {
+	i := 0
+	start := i
+	dot := -1
+	trunk := -1
+	n := uint64(0)
+	for ; i < len(b); i++ {
+		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')
+				}
+			}
+		} else if dot == -1 && c == '.' {
+			dot = i
+		} else {
+			break
+		}
+	}
+	if i == start || i == start+1 && dot == start {
+		return 0.0, 0
+	}
+
+	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 := -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
+	}
+	return f * math.Pow10(int(-mantExp)), i
+}