/
parser.go
51 lines (43 loc) · 968 Bytes
/
parser.go
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package parser
import (
"errors"
"io"
)
var (
ErrNotMatched = errors.New("not matched") // parser didn't match input
)
type (
Reader interface {
io.ReadSeeker
io.ByteReader
io.RuneReader
}
BitReader interface {
Reader
ReadBits(uint8) (uint64, uint8, error)
ReadBool() (bool, error)
}
ParserFunc[R Reader, T any] func(in R) (T, error)
ParserFuncPtr[R Reader, T any] *func(in R) (T, error)
ParserConstraint[R Reader, T any] interface {
ParserFunc[R, T] | ParserFuncPtr[R, T]
}
Parser[R Reader, T any] ParserFunc[R, T]
Empty struct{}
Predicate[T any] func(T) bool
Accumulator[T, R any] func(R, T) R
Pair[A, B any] struct {
First A
Second B
}
)
func Untyped[R Reader, T any](p Parser[R, T]) Parser[R, interface{}] {
return func(in R) (interface{}, error) {
return p(in)
}
}
func Ptr[R Reader, T any](p *Parser[R, T]) Parser[R, T] {
return func(in R) (T, error) {
return (*p)(in)
}
}