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134 lines
2.0 KiB
134 lines
2.0 KiB
package pgdialect
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import (
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"bytes"
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"encoding/hex"
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"fmt"
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"io"
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)
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type arrayParser struct {
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*streamParser
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err error
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}
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func newArrayParser(b []byte) *arrayParser {
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p := &arrayParser{
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streamParser: newStreamParser(b, 1),
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}
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if len(b) < 2 || b[0] != '{' || b[len(b)-1] != '}' {
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p.err = fmt.Errorf("bun: can't parse array: %q", b)
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}
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return p
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}
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func (p *arrayParser) NextElem() ([]byte, error) {
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if p.err != nil {
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return nil, p.err
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}
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c, err := p.readByte()
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if err != nil {
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return nil, err
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}
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switch c {
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case '}':
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return nil, io.EOF
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case '"':
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b, err := p.readSubstring()
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if err != nil {
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return nil, err
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}
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if p.peek() == ',' {
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p.skipNext()
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}
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return b, nil
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default:
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b := p.readSimple()
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if bytes.Equal(b, []byte("NULL")) {
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b = nil
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}
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if p.peek() == ',' {
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p.skipNext()
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}
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return b, nil
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}
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}
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func (p *arrayParser) readSimple() []byte {
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p.unreadByte()
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if i := bytes.IndexByte(p.b[p.i:], ','); i >= 0 {
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b := p.b[p.i : p.i+i]
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p.i += i
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return b
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}
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b := p.b[p.i : len(p.b)-1]
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p.i = len(p.b) - 1
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return b
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}
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func (p *arrayParser) readSubstring() ([]byte, error) {
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c, err := p.readByte()
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if err != nil {
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return nil, err
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}
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p.buf = p.buf[:0]
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for {
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if c == '"' {
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break
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}
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next, err := p.readByte()
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if err != nil {
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return nil, err
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}
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if c == '\\' {
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switch next {
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case '\\', '"':
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p.buf = append(p.buf, next)
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c, err = p.readByte()
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if err != nil {
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return nil, err
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}
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default:
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p.buf = append(p.buf, '\\')
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c = next
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}
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continue
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}
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if c == '\'' && next == '\'' {
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p.buf = append(p.buf, next)
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c, err = p.readByte()
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if err != nil {
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return nil, err
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}
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continue
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}
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p.buf = append(p.buf, c)
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c = next
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}
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if bytes.HasPrefix(p.buf, []byte("\\x")) && len(p.buf)%2 == 0 {
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data := p.buf[2:]
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buf := make([]byte, hex.DecodedLen(len(data)))
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n, err := hex.Decode(buf, data)
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if err != nil {
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return nil, err
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}
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return buf[:n], nil
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}
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return p.buf, nil
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}
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