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grouper.go
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grouper.go
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package gogroup
import (
"fmt"
"regexp"
"strings"
)
type grouper struct {
regexps map[int]string
// The group numbers of prefixed packages.
prefixes map[int]string
// The group numbers of standard packages and unidentified packages.
std, namedStd int
other, namedOther int
named int
// The next integer to assign
next int
}
const (
std = iota
namedStd
other
namedOther
named
next
)
func NewGrouper() *grouper {
return &grouper{
regexps: make(map[int]string),
prefixes: make(map[int]string),
std: std,
namedStd: namedStd,
other: other,
namedOther: namedOther,
named: named,
next: next,
}
}
func (g *grouper) Group(pkg string) int {
for n := 0; n < g.next; n++ {
regexpStr := g.regexps[n]
if len(regexpStr) == 0 {
continue
}
if regexp.MustCompile(regexpStr).FindStringSubmatch(pkg) != nil {
return n
}
}
for n := 0; n < g.next; n++ {
prefix := g.prefixes[n]
if len(prefix) == 0 {
continue
}
if strings.HasPrefix(pkg, prefix) {
return n
}
}
// A dot distinguishes non-standard packages.
named := strings.Contains(pkg, " ")
other := strings.Contains(pkg, ".")
switch {
case !named && !other:
return g.std
case !named && other:
return g.other
case named && !other:
return g.namedStd
case named && other:
return g.namedOther
default:
return g.named
}
}
func (g *grouper) wasSet() bool {
return g.next > next
}
func (g *grouper) String() string {
parts := []string{}
for i := 0; i < g.next; i++ {
if g.std == i {
parts = append(parts, "std")
}
if g.namedStd == i {
parts = append(parts, "namedStd")
}
if g.other == i {
parts = append(parts, "other")
}
if g.namedOther == i {
parts = append(parts, "namedOther")
}
if g.named == i {
parts = append(parts, "named")
}
if p, ok := g.prefixes[i]; ok {
parts = append(parts, fmt.Sprintf("prefix=%s", p))
}
if p, ok := g.regexps[i]; ok {
parts = append(parts, fmt.Sprintf("regexp=%s", p))
}
if len(parts) > 0 {
parts[len(parts)-1] += fmt.Sprintf("(%d)", i)
}
}
return strings.Join(parts, ",")
}
var rePrefix = regexp.MustCompile(`^prefix=(.*)$`)
var reRegexp = regexp.MustCompile(`^regexp=(.*)$`)
func (g *grouper) Set(s string) error {
parts := strings.Split(s, ",")
for _, p := range parts {
if p == "std" {
g.std = g.next
if g.namedStd == namedStd {
g.namedStd = g.next
}
} else if p == "namedStd" {
g.namedStd = g.next
} else if p == "other" {
g.other = g.next
if g.namedOther == namedOther {
g.namedOther = g.next
}
} else if p == "namedOther" {
g.namedOther = g.next
} else if p == "named" {
g.named = g.next
if g.namedStd == namedStd || g.namedStd == g.std {
g.namedStd = g.next
}
if g.namedOther == namedOther || g.namedOther == g.other {
g.namedOther = g.next
}
} else if match := rePrefix.FindStringSubmatch(p); match != nil {
g.prefixes[g.next] = match[1]
} else if match := reRegexp.FindStringSubmatch(p); match != nil {
g.regexps[g.next] = match[1]
} else {
return fmt.Errorf("Unknown order specification '%s'", p)
}
g.next++
}
// fmt.Println(g)
return nil
}