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|
package query
import (
"errors"
"fmt"
"strings"
"github.com/jpappel/atlas/pkg/index"
)
var ErrUnrecognizedOutputToken = errors.New("Unrecognized output token")
var ErrExpectedMoreStringTokens = errors.New("Expected more string tokens")
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)
Output(docs []index.Document) (string, error)
}
type JsonOutput struct{}
type CustomOutput struct {
stringTokens []string
tokens []OutputToken
datetimeFormat string
}
func (o JsonOutput) OutputOne(doc index.Document) (string, error) {
// TODO: implement
return "", nil
}
func (o JsonOutput) Output(docs []index.Document) (string, error) {
// TODO: implement
return "", 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 {
s := string(curTok)
if s == "%%" {
strToks = append(strToks, "%")
toks = append(toks, OUT_TOK_STR)
} else if s == "%p" {
toks = append(toks, OUT_TOK_PATH)
} else if s == "%T" {
toks = append(toks, OUT_TOK_TITLE)
} else if s == "%d" {
toks = append(toks, OUT_TOK_DATE)
} else if s == "%f" {
toks = append(toks, OUT_TOK_FILETIME)
} else if s == "%a" {
toks = append(toks, OUT_TOK_AUTHORS)
} else if s == "%t" {
toks = append(toks, OUT_TOK_TAGS)
} else if s == "%l" {
toks = append(toks, OUT_TOK_LINKS)
} else if s == "%m" {
toks = append(toks, OUT_TOK_META)
} else {
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{}
// TODO: determine realistic initial capacity
if err := o.writeDoc(&b, doc); err != nil {
return "", err
}
return b.String(), nil
}
func (o CustomOutput) Output(docs []index.Document) (string, error) {
b := strings.Builder{}
// TODO: determine realistic initial capacity
for i := range len(docs) - 1 {
if err := o.writeDoc(&b, docs[i]); err != nil {
return "", err
}
b.WriteRune('\n')
}
if err := o.writeDoc(&b, docs[len(docs)-1]); err != nil {
return "", err
}
b.WriteRune('\n')
return b.String(), nil
}
func (o CustomOutput) writeDoc(b *strings.Builder, doc index.Document) error {
curStrTok := 0
for _, token := range o.tokens {
if token == OUT_TOK_STR {
if curStrTok >= len(o.stringTokens) {
return ErrExpectedMoreStringTokens
}
b.WriteString(o.stringTokens[curStrTok])
curStrTok++
} else if token == OUT_TOK_PATH {
b.WriteString(doc.Path)
} else if token == OUT_TOK_TITLE {
b.WriteString(doc.Title)
} else if token == OUT_TOK_DATE {
b.WriteString(doc.Date.Format(o.datetimeFormat))
} else if token == OUT_TOK_FILETIME {
b.WriteString(doc.FileTime.Format(o.datetimeFormat))
} else if token == OUT_TOK_AUTHORS {
b.WriteString(strings.Join(doc.Authors, ", "))
} else if token == OUT_TOK_TAGS {
b.WriteString(strings.Join(doc.Tags, ", "))
} else if token == OUT_TOK_LINKS {
b.WriteString(strings.Join(doc.Links, ", "))
} else if token == OUT_TOK_META {
b.WriteString(doc.OtherMeta)
} else {
return ErrUnrecognizedOutputToken
}
}
return nil
}
|
