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count.go
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count.go
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package repeat
import (
"fmt"
"github.com/flier/gocombine/pkg/parser"
"github.com/flier/gocombine/pkg/parser/combinator"
"github.com/flier/gocombine/pkg/stream"
)
// Count parses `parser` from zero up to `count` times.
func Count[T stream.Token, O any](count int, parser parser.Func[T, O]) parser.Func[T, []O] {
return CountMinMax(0, count, parser)
}
var errExpected = parser.ErrExpected
// CountMinMax parses `p` from `min` to `max` times (including `min` and `max`).
func CountMinMax[T stream.Token, O any](min, max int, p parser.Func[T, O]) parser.Func[T, []O] {
return parser.Expected(func(input []T) (parsed []O, remaining []T, err error) {
remaining = input
parsed = make([]O, 0, max)
for i := 0; i < max; i++ {
var o O
var rest []T
if o, rest, err = p(remaining); err != nil {
break
}
parsed = append(parsed, o)
remaining = rest
}
if len(parsed) < min {
err = fmt.Errorf("%d more elements, %w", min-len(parsed), errExpected)
} else {
err = nil
}
return
}, "count min max")
}
// SkipCount parses `parser` from zero up to `count` times skipping the output of `parser`.
func SkipCount[T stream.Token, O any](count int, parser parser.Func[T, O]) parser.Func[T, any] {
return combinator.Ignore(Count(count, parser)).Expected("skip count")
}
// SkipCountMinMax parses `parser` from `min` to `max` times (including `min` and `max`)
// skipping the output of `parser`.
func SkipCountMinMax[T stream.Token, O any](min, max int, parser parser.Func[T, O]) parser.Func[T, any] {
return combinator.Ignore(CountMinMax(min, max, parser)).Expected("skip count min max")
}