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io.go
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io.go
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package core
import (
"io"
"strings"
"github.com/pkg/errors"
)
type CanInterface interface {
Interface() any
}
type CanString interface {
String() string
}
func NewStringReaders(values []string) *StringReaders {
bs := make([]io.ReadCloser, len(values))
for i := range values {
bs[i] = &StringReader{v: values[i]}
}
return &StringReaders{
Readers: bs,
values: values,
}
}
type StringReaders struct {
idx int
Readers []io.ReadCloser
values []string
}
func (v *StringReaders) Close() error {
for i := range v.Readers {
_ = v.Readers[i].Close()
}
return nil
}
func (v *StringReaders) Interface() any {
return v.values
}
func (v *StringReaders) Len() int {
return len(v.Readers)
}
func (v *StringReaders) Read(p []byte) (n int, err error) {
if v.idx < len(v.Readers) {
return v.Readers[v.idx].Read(p)
}
return -1, errors.Errorf("bounds out of range, %d", v.idx)
}
func (v *StringReaders) NextReader() io.ReadCloser {
r := v.Readers[v.idx]
v.idx++
return r
}
func NewStringReader(v string) *StringReader {
return &StringReader{v: v}
}
type StringReader struct {
v string
r io.Reader
}
func (r *StringReader) Read(p []byte) (n int, err error) {
if r.r == nil {
r.r = strings.NewReader(r.v)
}
return r.r.Read(p)
}
func (r *StringReader) Interface() any {
return r.v
}
func (r *StringReader) String() string {
return r.v
}
func (r *StringReader) Close() error {
return nil
}
func NewStringBuilders() *StringBuilders {
return &StringBuilders{}
}
type StringBuilders struct {
idx int
buffers []*strings.Builder
}
func (v *StringBuilders) SetN(n int) {
v.buffers = make([]*strings.Builder, n)
v.idx = 0
for i := range v.buffers {
v.buffers[i] = &strings.Builder{}
}
}
func (v *StringBuilders) NextWriter() io.Writer {
if v.idx == 0 && len(v.buffers) == 0 {
v.SetN(1)
}
r := v.buffers[v.idx]
v.idx++
return r
}
func (v *StringBuilders) Write(p []byte) (n int, err error) {
if v.idx == 0 && len(v.buffers) == 0 {
v.SetN(1)
}
return v.buffers[v.idx].Write(p)
}
func (v *StringBuilders) StringSlice() []string {
values := make([]string, len(v.buffers))
for i, b := range v.buffers {
values[i] = b.String()
}
return values
}