mirror of
https://github.com/dolthub/dolt.git
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86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
// Copyright 2019 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strhelp
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// NthToken returns the Nth token in s, delimited by delim. There is always at least one token: the zeroth token is the
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// input string if delim doesn't occur in s. The second return value will be false if there is no Nth token.
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func NthToken(s string, delim rune, n int) (string, bool) {
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if n < 0 {
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panic("invalid arguments.")
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}
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prev := 0
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curr := 0
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for ; curr < len(s); curr++ {
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if s[curr] == uint8(delim) {
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n--
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if n >= 0 {
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prev = curr + 1
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} else {
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break
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}
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}
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}
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if n <= 0 && prev <= curr {
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return s[prev:curr], true
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}
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return "", false
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}
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func CommaIfy(n int64) string {
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str := strconv.FormatInt(n, 10)
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if len(str) < 4 {
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return str
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}
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result := ""
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for i := len(str); i >= 0; i -= 3 {
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if i-4 >= 0 {
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result = "," + str[i-3:i] + result
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} else {
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result = str[0:i] + result
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}
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}
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return result
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}
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// LineStrBuilder is a utility class for building strings line by line
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type LineStrBuilder []string
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// AppendLine works like append in that it returns an instance of a LineStrBuilder with the contents updated to contain
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// the additional line. lsb = lsb.AppendLine("n: %d, s: %s", n, s)
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func (lsb LineStrBuilder) AppendLine(strFmt string, args ...interface{}) LineStrBuilder {
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updated := append(lsb, fmt.Sprintf(strFmt, args...))
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return updated
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}
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// String returns the built string with all lines separated by newlines
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func (lsb LineStrBuilder) String() string {
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s := strings.Join(lsb, "\n")
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return s
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}
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