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|
package query
import (
"encoding/json"
"fmt"
"io"
"strings"
"github.com/jpappel/atlas/pkg/index"
)
const DefaultOutputFormat string = "%p %T %d authors:%a tags:%t"
type OutputToken uint64
// TODO: support long token names
const (
OUT_TOK_STR OutputToken = iota
OUT_TOK_PATH // %p %path
OUT_TOK_TITLE // %T %title
OUT_TOK_DATE // %d %date
OUT_TOK_FILETIME // %f %filetime
OUT_TOK_AUTHORS // %a %authors
OUT_TOK_TAGS // %t %tags
OUT_TOK_LINKS // %l %links
OUT_TOK_META // %m %meta
)
// TODO: change interface to use byte slices
type Outputer interface {
OutputOne(doc *index.Document) (string, error)
OutputOneTo(w io.Writer, doc *index.Document) (int, error)
Output(docs []*index.Document) (string, error)
OutputTo(w io.Writer, docs []*index.Document) (int, error)
}
type DefaultOutput struct{}
type JsonOutput struct{}
type CustomOutput struct {
stringTokens []string
tokens []OutputToken
datetimeFormat string
}
// compile time interface check
var _ Outputer = &DefaultOutput{}
var _ Outputer = &JsonOutput{}
var _ Outputer = &CustomOutput{}
// Returns "<path> <title> <date> authors:<authors...> tags:<tags>"
// and a nil error
func (o DefaultOutput) OutputOne(doc *index.Document) (string, error) {
b := strings.Builder{}
o.writeDoc(&b, doc)
return b.String(), nil
}
func (o DefaultOutput) OutputOneTo(w io.Writer, doc *index.Document) (int, error) {
return o.writeDoc(w, doc)
}
func (o DefaultOutput) Output(docs []*index.Document) (string, error) {
b := strings.Builder{}
for i, doc := range docs {
o.writeDoc(&b, doc)
if i != len(docs)-1 {
b.WriteRune('\n')
}
}
return b.String(), nil
}
func (o DefaultOutput) OutputTo(w io.Writer, docs []*index.Document) (int, error) {
n := 0
for _, doc := range docs {
nn, err := o.writeDoc(w, doc)
if err != nil {
return n, err
}
n += nn
}
return n, nil
}
func (o DefaultOutput) writeDoc(w io.Writer, doc *index.Document) (int, error) {
var n int
s := [][]byte{
[]byte(doc.Path),
{' '},
[]byte(doc.Title),
{' '},
[]byte(doc.Date.String()),
{' '},
[]byte("authors:"),
[]byte(strings.Join(doc.Authors, ",")),
[]byte(" tags:"),
[]byte(strings.Join(doc.Tags, ",")),
}
for _, b := range s {
cnt, err := w.Write(b)
if err != nil {
return n, err
}
n += cnt
}
return n, nil
}
func (o JsonOutput) OutputOne(doc *index.Document) (string, error) {
b, err := json.Marshal(doc)
if err != nil {
return "", err
}
return string(b), nil
}
func (o JsonOutput) OutputOneTo(w io.Writer, doc *index.Document) (int, error) {
b, err := json.Marshal(doc)
if err != nil {
return 0, err
}
return w.Write(b)
}
func (o JsonOutput) Output(docs []*index.Document) (string, error) {
b, err := json.Marshal(docs)
if err != nil {
return "", err
}
return string(b), nil
}
func (o JsonOutput) OutputTo(w io.Writer, docs []*index.Document) (int, error) {
n := 0
for _, doc := range docs {
b, err := json.Marshal(doc)
if err != nil {
return n, err
}
nn, err := w.Write(b)
if err != nil {
return n, err
}
n += nn
}
return n, nil
}
func ParseOutputFormat(formatStr string) ([]OutputToken, []string, error) {
toks := make([]OutputToken, 0, 16)
curTok := make([]rune, 0, 16)
strToks := make([]string, 0, 8)
for _, c := range formatStr {
if c == '%' && len(curTok) > 0 && curTok[0] != '%' {
strToks = append(strToks, string(curTok))
toks = append(toks, OUT_TOK_STR)
curTok = curTok[:0]
curTok = append(curTok, c)
continue
}
curTok = append(curTok, c)
if curTok[0] == '%' && len(curTok) == 2 {
switch string(curTok) {
case "%%":
strToks = append(strToks, "%")
toks = append(toks, OUT_TOK_STR)
case "%p":
toks = append(toks, OUT_TOK_PATH)
case "%T":
toks = append(toks, OUT_TOK_TITLE)
case "%d":
toks = append(toks, OUT_TOK_DATE)
case "%f":
toks = append(toks, OUT_TOK_FILETIME)
case "%a":
toks = append(toks, OUT_TOK_AUTHORS)
case "%t":
toks = append(toks, OUT_TOK_TAGS)
case "%l":
toks = append(toks, OUT_TOK_LINKS)
case "%m":
toks = append(toks, OUT_TOK_META)
default:
return nil, nil, ErrUnrecognizedOutputToken
}
curTok = curTok[:0]
}
}
if len(curTok) != 0 && curTok[len(curTok)-1] == '%' {
fmt.Println("2")
return nil, nil, ErrUnrecognizedOutputToken
} else if len(curTok) != 0 {
strToks = append(strToks, string(curTok))
toks = append(toks, OUT_TOK_STR)
}
return toks, strToks, nil
}
func NewCustomOutput(formatStr string, datetimeFormat string) (CustomOutput, error) {
outToks, strToks, err := ParseOutputFormat(formatStr)
if err != nil {
return CustomOutput{}, err
}
return CustomOutput{strToks, outToks, datetimeFormat}, nil
}
func (o CustomOutput) OutputOne(doc *index.Document) (string, error) {
b := strings.Builder{}
if _, err := o.writeDoc(&b, doc); err != nil {
return "", err
}
return b.String(), nil
}
func (o CustomOutput) OutputOneTo(w io.Writer, doc *index.Document) (int, error) {
return o.writeDoc(w, doc)
}
func (o CustomOutput) Output(docs []*index.Document) (string, error) {
b := strings.Builder{}
for i, doc := range docs {
if _, err := o.writeDoc(&b, doc); err != nil {
return "", err
}
if i != len(docs)-1 {
b.WriteRune('\n')
}
}
return b.String(), nil
}
func (o CustomOutput) OutputTo(w io.Writer, docs []*index.Document) (int, error) {
n := 0
for _, doc := range docs {
nn, err := o.writeDoc(w, doc)
if err != nil {
return n, err
}
n += nn
}
return n, nil
}
func (o CustomOutput) writeDoc(w io.Writer, doc *index.Document) (int, error) {
curStrTok := 0
n := 0
for _, token := range o.tokens {
switch token {
case OUT_TOK_STR:
if curStrTok >= len(o.stringTokens) {
return n, ErrExpectedMoreStringTokens
}
cnt, err := w.Write([]byte(o.stringTokens[curStrTok]))
if err != nil {
return n, err
}
n += cnt
curStrTok++
case OUT_TOK_PATH:
cnt, err := w.Write([]byte(doc.Path))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_TITLE:
cnt, err := w.Write([]byte(doc.Title))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_DATE:
cnt, err := w.Write([]byte(doc.Date.Format(o.datetimeFormat)))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_FILETIME:
cnt, err := w.Write([]byte(doc.FileTime.Format(o.datetimeFormat)))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_AUTHORS:
cnt, err := w.Write([]byte(strings.Join(doc.Authors, ", ")))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_TAGS:
cnt, err := w.Write([]byte(strings.Join(doc.Tags, ", ")))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_LINKS:
cnt, err := w.Write([]byte(strings.Join(doc.Links, ", ")))
if err != nil {
return n, err
}
n += cnt
case OUT_TOK_META:
cnt, err := w.Write([]byte(doc.OtherMeta))
if err != nil {
return n, err
}
n += cnt
default:
return n, ErrUnrecognizedOutputToken
}
}
return n, nil
}
|
