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fast.go
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fast.go
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package main
import (
"bufio"
"encoding/json"
"fmt"
"github.com/mailru/easyjson"
"github.com/mailru/easyjson/jlexer"
"github.com/mailru/easyjson/jwriter"
"io"
"os"
"strings"
)
type User struct {
Name string
Email string
Browsers []string
}
// suppress unused package warning
var (
_ *json.RawMessage
_ *jlexer.Lexer
_ *jwriter.Writer
_ easyjson.Marshaler
)
func easyjson9e1087fdDecodeGithubComMort4lisGoCourseraEz(in *jlexer.Lexer, out *User) {
isTopLevel := in.IsStart()
if in.IsNull() {
if isTopLevel {
in.Consumed()
}
in.Skip()
return
}
in.Delim('{')
for !in.IsDelim('}') {
key := in.UnsafeFieldName(false)
in.WantColon()
if in.IsNull() {
in.Skip()
in.WantComma()
continue
}
switch key {
case "name":
out.Name = in.String()
case "email":
out.Email = in.String()
case "browsers":
if in.IsNull() {
in.Skip()
out.Browsers = nil
} else {
in.Delim('[')
if out.Browsers == nil {
if !in.IsDelim(']') {
out.Browsers = make([]string, 0, 4)
} else {
out.Browsers = []string{}
}
} else {
out.Browsers = (out.Browsers)[:0]
}
for !in.IsDelim(']') {
var v1 string
v1 = in.String()
out.Browsers = append(out.Browsers, v1)
in.WantComma()
}
in.Delim(']')
}
default:
in.SkipRecursive()
}
in.WantComma()
}
in.Delim('}')
if isTopLevel {
in.Consumed()
}
}
func easyjson9e1087fdEncodeGithubComMort4lisGoCourseraEz(out *jwriter.Writer, in User) {
out.RawByte('{')
first := true
_ = first
{
const prefix string = ",\"name\":"
out.RawString(prefix[1:])
out.String(in.Name)
}
{
const prefix string = ",\"email\":"
out.RawString(prefix)
out.String(in.Email)
}
{
const prefix string = ",\"browsers\":"
out.RawString(prefix)
if in.Browsers == nil && (out.Flags&jwriter.NilSliceAsEmpty) == 0 {
out.RawString("null")
} else {
out.RawByte('[')
for v2, v3 := range in.Browsers {
if v2 > 0 {
out.RawByte(',')
}
out.String(v3)
}
out.RawByte(']')
}
}
out.RawByte('}')
}
// MarshalJSON supports json.Marshaler interface
func (v User) MarshalJSON() ([]byte, error) {
w := jwriter.Writer{}
easyjson9e1087fdEncodeGithubComMort4lisGoCourseraEz(&w, v)
return w.Buffer.BuildBytes(), w.Error
}
// MarshalEasyJSON supports easyjson.Marshaler interface
func (v User) MarshalEasyJSON(w *jwriter.Writer) {
easyjson9e1087fdEncodeGithubComMort4lisGoCourseraEz(w, v)
}
// UnmarshalJSON supports json.Unmarshaler interface
func (v *User) UnmarshalJSON(data []byte) error {
r := jlexer.Lexer{Data: data}
easyjson9e1087fdDecodeGithubComMort4lisGoCourseraEz(&r, v)
return r.Error()
}
// UnmarshalEasyJSON supports easyjson.Unmarshaler interface
func (v *User) UnmarshalEasyJSON(l *jlexer.Lexer) {
easyjson9e1087fdDecodeGithubComMort4lisGoCourseraEz(l, v)
}
func FastSearch(out io.Writer) {
file, err := os.Open(filePath)
if err != nil {
panic(err)
}
i := -1
sc := bufio.NewScanner(file)
browserSet := make(map[string]bool)
_, _ = fmt.Fprintln(out, "found users:")
for sc.Scan() {
user := new(User)
if err = user.UnmarshalJSON(sc.Bytes()); err != nil {
panic(err)
}
i++
var hasAndroid, hasMSIE bool
for _, browser := range user.Browsers {
containsAndroid := strings.Contains(browser, "Android")
containsMSIE := strings.Contains(browser, "MSIE")
if containsAndroid {
hasAndroid = true
}
if containsMSIE {
hasMSIE = true
}
if containsAndroid || containsMSIE {
if !browserSet[browser] {
browserSet[browser] = true
}
}
}
if hasAndroid && hasMSIE {
email := strings.ReplaceAll(user.Email, "@", " [at] ")
_, _ = fmt.Fprintf(out, "[%d] %s <%s>\n", i, user.Name, email)
}
}
_, _ = fmt.Fprintln(out, "\nTotal unique browsers", len(browserSet))
}