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|
package parser
import (
"bytes"
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
"strings"
"text/template"
)
var (
moviePattern = regexp.MustCompile(`(.*?)\.(\d{4})`)
episodePatterns = [4]*regexp.Regexp{
regexp.MustCompile(`^(?P<name>.+?)\.S(?P<season>\d{2})(?:E(?P<episode>\d{2}))?`), // S01, S01E04
regexp.MustCompile(`^(?P<name>.+?)\.E(?P<episode>\d{2})`), // E04
regexp.MustCompile(`^(?P<name>.+?)\.(?P<season>\d{1,2})x(?P<episode>\d{2})`), // 1x04, 01x04
regexp.MustCompile(`^(?P<name>.+?)\.P(?:ar)?t\.?(?P<episode>([^.]+))`), // P(ar)t(.)11, Pt(.)XI
}
splitPattern = regexp.MustCompile(`[-_.]`)
)
type Parser func(s string) (Media, error)
type Media struct {
Release string
Name string
Year int
Season int
Episode int
Resolution string
Codec string
}
func (m *Media) IsEmpty() bool {
return m.Name == ""
}
func (m *Media) ReplaceName(re *regexp.Regexp, repl string) {
m.Name = re.ReplaceAllString(m.Name, repl)
}
func (m *Media) Equal(o Media) bool {
if m.IsEmpty() {
return false
}
return m.Name == o.Name &&
m.Season == o.Season &&
m.Episode == o.Episode &&
m.Year == o.Year &&
m.Resolution == o.Resolution &&
m.Codec == o.Codec
}
func (m *Media) PathIn(dir *template.Template) (string, error) {
var b bytes.Buffer
if err := dir.Execute(&b, m); err != nil {
return "", err
}
path := b.String()
// When path has a trailing slash, the actual destination path will be a directory inside LocalPath (same
// behaviour as rsync)
if strings.HasSuffix(path, string(os.PathSeparator)) {
path = filepath.Join(path, m.Release)
}
return path, nil
}
func Default(s string) (Media, error) {
return Media{Release: s}, nil
}
func Movie(s string) (Media, error) {
matches := moviePattern.FindStringSubmatch(s)
if len(matches) < 3 {
return Media{}, fmt.Errorf("invalid input: %q", s)
}
name := matches[1]
year, err := strconv.Atoi(matches[2])
if err != nil {
return Media{}, fmt.Errorf("invalid input: %q: %s", s, err)
}
return Media{
Release: s,
Name: name,
Year: year,
Resolution: resolution(s),
Codec: codec(s),
}, nil
}
func Show(s string) (Media, error) {
for _, p := range episodePatterns {
matches := p.FindStringSubmatch(s)
if len(matches) == 0 {
continue
}
groupNames := p.SubexpNames()
var (
name string
season = 1
episode = 0
err error
)
for i, group := range matches {
if group == "" {
continue
}
switch groupNames[i] {
case "name":
name = group
case "season":
season, err = strconv.Atoi(group)
if err != nil {
return Media{}, fmt.Errorf("invalid input: %q: %w", s, err)
}
case "episode":
episode, err = strconv.Atoi(group)
if err != nil {
episode, err = rtoi(group)
if err != nil {
return Media{}, fmt.Errorf("invalid input: %q: %w", s, err)
}
}
}
}
return Media{
Release: s,
Name: name,
Season: season,
Episode: episode,
Resolution: resolution(s),
Codec: codec(s),
}, nil
}
return Media{}, fmt.Errorf("invalid input: %q", s)
}
func findPart(s string, partFunc func(part string) bool) string {
s = strings.ToLower(s)
parts := splitPattern.Split(s, -1)
for _, part := range parts {
if partFunc(part) {
return part
}
}
return ""
}
func resolution(s string) string {
return findPart(s, func(part string) bool {
switch part {
case "720p", "1080p", "2160p":
return true
}
return false
})
}
func codec(s string) string {
return findPart(s, func(part string) bool {
switch part {
case "xvid", "x264", "x265":
return true
}
return false
})
}
var numerals = []numeral{
// units
{"IX", 9},
{"VIII", 8},
{"VII", 7},
{"VI", 6},
{"IV", 4},
{"III", 3},
{"II", 2},
{"V", 5},
{"I", 1},
// tens
{"XC", 90},
{"LXXX", 80},
{"LXX", 70},
{"LX", 60},
{"XL", 40},
{"XXX", 30},
{"XX", 20},
{"L", 50},
{"X", 10},
// hundreds
{"CM", 900},
{"DCCC", 800},
{"DCC", 700},
{"DC", 600},
{"CD", 400},
{"CCC", 300},
{"CC", 200},
{"D", 500},
{"C", 100},
// thousands
{"MMM", 3000},
{"MM", 2000},
{"M", 1000},
}
type numeral struct {
s string
n int
}
func (n numeral) parse(s string, lastIndex int) (string, int, int) {
i := strings.LastIndex(s, n.s)
if i > -1 && i < lastIndex {
rest := s[:i] + s[i+len(n.s):]
return rest, i, n.n
}
return s, lastIndex, 0
}
func rtoi(s string) (int, error) {
// needlessly complete parsing of roman numerals
sum := 0
lastIndex := len(s)
for _, num := range numerals {
var n int
s, lastIndex, n = num.parse(s, lastIndex)
sum += n
if s == "" {
break
}
}
if s != "" {
return 0, fmt.Errorf("invalid roman numeral: %q", s)
}
return sum, nil
}
|
