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parse.go
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parse.go
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/*
Copyright 2022 Josh Deprez
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// Package parse contains string parsing helper functions.
package parse
import (
"fmt"
"strconv"
"strings"
)
// Digits converts a string of decimal digits (0-9) into `[]int`, where
// each element is the value of a digit.
func Digits(s string) ([]int, error) {
r := make([]int, len(s))
for i, d := range s {
if d < '0' || d > '9' {
return nil, fmt.Errorf("rune %c at pos %d is not a digit [0-9]", d, i)
}
r[i] = int(d - '0')
}
return r, nil
}
// Ints converts whitespace-separated ints into `[]int`.
func Ints(s string) ([]int, error) {
fs := strings.Fields(s)
r := make([]int, len(fs))
for i, f := range fs {
y, err := strconv.Atoi(f)
if err != nil {
return nil, err
}
r[i] = y
}
return r, nil
}
// Fields returns `strings.Fields(s), nil`.
func Fields(s string) ([]string, error) {
return strings.Fields(s), nil
}
// Bytes returns `[]byte(s), nil`.
func Bytes(s string) ([]byte, error) {
return []byte(s), nil
}
// Runes returns `[]rune(s), nil`.
func Runes(s string) ([]rune, error) {
return []rune(s), nil
}