Dan Anglin
76583b3dda
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It's time to add common functions to the internal 'common' package. - Add the function that read the contents from a file to a list. - Add the function that parses a list of integers from a string. ...and more to come later...
65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package common
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"unicode"
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)
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func ReadFile(filename string) ([]string, error) {
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file, err := os.Open(filename)
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if err != nil {
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return nil, fmt.Errorf("unable to open %q; %w", filename, err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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var lines []string
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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return nil, fmt.Errorf("error scanning %q; %w", filename, err)
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}
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return lines, nil
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}
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func ParseIntList(line string) ([]int, error) {
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var values []int
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digitString := ""
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addValue := func(digit string) error {
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if len(digit) > 0 {
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value, err := strconv.Atoi(digit)
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if err != nil {
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return fmt.Errorf("unable to parse %q to int; %w", digit, err)
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}
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values = append(values, value)
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}
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return nil
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}
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for i, v := range line {
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if unicode.IsDigit(v) {
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digitString = digitString + string(v)
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if i == len(line)-1 {
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if err := addValue(digitString); err != nil {
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return nil, fmt.Errorf("unable to add %q to the list of ints; %w", digitString, err)
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}
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}
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} else {
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if err := addValue(digitString); err != nil {
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return nil, fmt.Errorf("unable to add %q to the list of ints; %w", digitString, err)
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}
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digitString = ""
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}
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}
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return values, nil
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}
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