80 lines
1.2 KiB
Go
80 lines
1.2 KiB
Go
package parser
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import (
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"bytes"
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"fmt"
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)
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type ArrayParser struct {
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*Parser
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stickyErr error
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}
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func NewArrayParser(b []byte) *ArrayParser {
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var err error
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if len(b) < 2 || b[0] != '{' || b[len(b)-1] != '}' {
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err = fmt.Errorf("pg: can't parse array: %s", string(b))
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} else {
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b = b[1 : len(b)-1]
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}
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return &ArrayParser{
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Parser: New(b),
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stickyErr: err,
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}
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}
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func (p *ArrayParser) NextElem() ([]byte, error) {
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if p.stickyErr != nil {
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return nil, p.stickyErr
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}
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switch c := p.Peek(); c {
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case '"':
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p.Advance()
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b := p.readSubstring()
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p.Skip(',')
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return b, nil
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case '{':
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b := p.readElem()
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if b != nil {
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b = append(b, '}')
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}
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p.Skip(',')
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return b, nil
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default:
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b, _ := p.ReadSep(',')
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if bytes.Equal(b, pgNull) {
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b = nil
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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) readElem() []byte {
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var b []byte
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for p.Valid() {
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c := p.Read()
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switch c {
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case '"':
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b = append(b, '"')
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for {
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bb, ok := p.ReadSep('"')
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b = append(b, bb...)
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stop := len(b) > 0 && b[len(b)-1] != '\\'
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if ok {
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b = append(b, '"')
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}
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if stop {
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break
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}
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}
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case '}':
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return b
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default:
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b = append(b, c)
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}
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}
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return b
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}
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