/
array_parser.go
94 lines (82 loc) · 1.35 KB
/
array_parser.go
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package parser
import (
"bytes"
"fmt"
)
type ArrayParser struct {
*Parser
stickyErr error
}
func NewArrayParser(b []byte) *ArrayParser {
var err error
if len(b) < 2 || b[0] != '{' || b[len(b)-1] != '}' {
err = fmt.Errorf("pg: can't parse array: %s", string(b))
} else {
b = b[1 : len(b)-1]
}
return &ArrayParser{
Parser: New(b),
stickyErr: err,
}
}
func (p *ArrayParser) NextElem() ([]byte, error) {
if p.stickyErr != nil {
return nil, p.stickyErr
}
switch c := p.Peek(); c {
case '"':
b, err := p.ReadSubstring()
if err != nil {
return nil, err
}
if p.Valid() {
if err := p.MustSkip(','); err != nil {
return nil, err
}
}
return b, nil
case '{':
b := p.readSubArray()
if b != nil {
b = append(b, '}')
}
if p.Valid() {
if err := p.MustSkip(','); err != nil {
return nil, err
}
}
return b, nil
default:
b, _ := p.ReadSep(',')
if bytes.Equal(b, pgNull) {
b = nil
}
return b, nil
}
}
func (p *ArrayParser) readSubArray() []byte {
var b []byte
for p.Valid() {
c := p.Read()
switch c {
case '"':
b = append(b, '"')
for {
bb, ok := p.ReadSep('"')
b = append(b, bb...)
stop := len(b) > 0 && b[len(b)-1] != '\\'
if ok {
b = append(b, '"')
}
if stop {
break
}
}
case '}':
return b
default:
b = append(b, c)
}
}
return b
}