Added methods to manipulate ints.

- Conversions and basic math.
2019-12-21 11:41:27 +01:00 · 2019-12-21 11:41:27 +01:00 · 3d416ec281
commit 3d416ec281
parent 1f581dfb43
1 changed files with 167 additions and 0 deletions
--- a/ints.go
+++ b/ints.go
@ -0,0 +1,167 @@
+package geom
+
+import (
+	"bytes"
+	"strconv"
+	"strings"
+)
+
+// AbsInt returns the absolute value of i.
+func AbsInt(i int) int {
+	if 0 > i {
+		return -i
+	}
+	return i
+}
+
+// Itoa returns i as a string.
+func Itoa(i int) string {
+	return strconv.Itoa(i)
+}
+
+// Itoa64 returns i as string.
+func Itoa64(i int64) string {
+	return strconv.FormatInt(i, 10)
+}
+
+// FmtInts formats the integer slice as a string each item separated by sep.
+func FmtInts(ints []int, sep string) string {
+	var out bytes.Buffer
+	for i, val := range ints {
+		if i > 0 {
+			out.WriteString(sep)
+		}
+		out.WriteString(Itoa(val))
+	}
+	return out.String()
+}
+
+// FmtInts64 formats the integer slice as a string each item separated by sep.
+func FmtInts64(ints []int64, sep string) string {
+	var out bytes.Buffer
+	for i, val := range ints {
+		if i > 0 {
+			out.WriteString(sep)
+		}
+		out.WriteString(Itoa64(val))
+	}
+	return out.String()
+}
+
+// MinInt returns the minimum of a and b.
+func MinInt(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+// MinInt64 returns the minimum of a and b.
+func MinInt64(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+// MaxInt returns the maximum of a and b.
+func MaxInt(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+// MaxInt64 returns the maximum of a and b.
+func MaxInt64(a, b int64) int64 {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+// MustAtoi parses string s as an integer. Method panics if the conversion fails.
+func MustAtoi(s string) int {
+	var i, err = strconv.Atoi(s)
+	if nil != err {
+		panic("error converting string to int")
+	}
+	return i
+}
+
+// MustAtoi64 parses string s as an integer. Method panics if the conversion fails.
+func MustAtoi64(s string) int64 {
+	var i, err = strconv.ParseInt(s, 10, 64)
+	if nil != err {
+		panic("error converting string to int")
+	}
+	return i
+}
+
+// MustAstois parses the strings as integers. Method panics if one of the conversion fails.
+func MustAstois(s ...string) []int {
+	var res = make([]int, len(s))
+	for i := range s {
+		res[i] = MustAtoi(s[i])
+	}
+	return res
+}
+
+// MustAstois64 parses the strings as integers. Method panics if one of the conversion fails.
+func MustAstois64(s ...string) []int64 {
+	var res = make([]int64, len(s))
+	for i := range s {
+		res[i] = MustAtoi64(s[i])
+	}
+	return res
+}
+
+// NormInt returns the normalized value of i (-1, 0 or 1).
+func NormInt(i int) int {
+	if i < 0 {
+		return -1
+	}
+	if i > 0 {
+		return 1
+	}
+	return 0
+}
+
+// NormInt64 returns the normalized value of i (-1, 0 or 1).
+func NormInt64(i int64) int64 {
+	if i < 0 {
+		return -1
+	}
+	if i > 0 {
+		return 1
+	}
+	return 0
+}
+
+// SplitInts splits the string s by separator sep, converts every part to an integer and returns all the integers as a slice. Method panics if one of the conversion fails.
+func SplitInts(s, sep string) []int {
+	var numbers = strings.Split(s, sep)
+	var ints = make([]int, len(numbers))
+	for i, n := range numbers {
+		ints[i] = MustAtoi(n)
+	}
+	return ints
+}
+
+// SplitInts64 splits the string s by separator sep, converts every part to an integer and returns all the integers as a slice. Method panics if one of the conversion fails.
+func SplitInts64(s, sep string) []int64 {
+	var numbers = strings.Split(s, sep)
+	var ints = make([]int64, len(numbers))
+	for i, n := range numbers {
+		ints[i] = MustAtoi64(n)
+	}
+	return ints
+}
+
+// SubAbsInt subtracts a from b and returns the absolute value of the result.
+func SubAbsInt(a, b int) int {
+	if a > b {
+		return a - b
+	}
+	return b - a
+}