87 lines
1.4 KiB
Go
87 lines
1.4 KiB
Go
// For more tutorials: https://bp.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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)
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const fieldsLength = 4
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type textParser struct {
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r io.Reader
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update func(r result)
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}
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func newTextParser(r io.Reader) *textParser {
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return &textParser{
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r: r,
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update: func(result) {},
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}
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}
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func parseTextFile(path string) (*textParser, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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return newTextParser(f), nil
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}
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func (p *textParser) notify(f func(r result)) {
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p.update = f
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}
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func (p *textParser) parse() error {
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defer readClose(p.r)
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var (
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l = 1
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in = bufio.NewScanner(p.r)
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)
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for in.Scan() {
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r, err := p.parseFields(in.Text())
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if err != nil {
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return fmt.Errorf("line %d: %v", l, err)
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}
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p.update(r)
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l++
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}
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return in.Err()
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}
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func (p *textParser) parseFields(s string) (r result, err error) {
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fields := strings.Fields(s)
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if len(fields) != fieldsLength {
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return r, fmt.Errorf("wrong number of fields %q", fields)
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}
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r.domain, r.page = fields[0], fields[1]
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r.visits, err = strconv.Atoi(fields[2])
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if err != nil || r.visits < 0 {
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return r, fmt.Errorf("wrong input %q", fields[2])
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}
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r.uniques, err = strconv.Atoi(fields[3])
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if err != nil || r.uniques < 0 {
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return r, fmt.Errorf("wrong input %q", fields[3])
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}
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return r, nil
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}
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