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package pgdialect
import (
"fmt"
"io"
)
type streamParser struct {
b []byte
i int
buf []byte
}
func newStreamParser(b []byte, start int) *streamParser {
return &streamParser{
b: b,
i: start,
}
}
func (p *streamParser) valid() bool {
return p.i < len(p.b)
}
func (p *streamParser) skipByte(skip byte) error {
c, err := p.readByte()
if err != nil {
return err
}
if c == skip {
return nil
}
p.unreadByte()
return fmt.Errorf("got %q, wanted %q", c, skip)
}
func (p *streamParser) readByte() (byte, error) {
if p.valid() {
c := p.b[p.i]
p.i++
return c, nil
}
return 0, io.EOF
}
func (p *streamParser) unreadByte() {
p.i--
}
func (p *streamParser) peek() byte {
if p.valid() {
return p.b[p.i]
}
return 0
}
func (p *streamParser) skipNext() {
p.i++
}
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