forked from MagicalTux/goro
/
buffer.go
176 lines (150 loc) · 3.17 KB
/
buffer.go
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package phpctx
import (
"errors"
"io"
"github.com/MagicalTux/goro/core/phpv"
)
const (
BufferWrite = 0
BufferStart = 1 << iota
BufferClean
BufferFlush
BufferFinal
BufferCleanable
BufferFlushable
BufferRemovable
)
//> const PHP_OUTPUT_HANDLER_START: phpv.ZInt(BufferStart)
//> const PHP_OUTPUT_HANDLER_WRITE: phpv.ZInt(BufferWrite)
//> const PHP_OUTPUT_HANDLER_FLUSH: phpv.ZInt(BufferFlush)
//> const PHP_OUTPUT_HANDLER_CLEAN: phpv.ZInt(BufferClean)
//> const PHP_OUTPUT_HANDLER_FINAL: phpv.ZInt(BufferFinal)
//> const PHP_OUTPUT_HANDLER_CONT: phpv.ZInt(BufferWrite)
//> const PHP_OUTPUT_HANDLER_END: phpv.ZInt(BufferFinal)
//> const PHP_OUTPUT_HANDLER_CLEANABLE: phpv.ZInt(BufferCleanable)
//> const PHP_OUTPUT_HANDLER_FLUSHABLE: phpv.ZInt(BufferFlushable)
//> const PHP_OUTPUT_HANDLER_REMOVABLE: phpv.ZInt(BufferRemovable)
//> const PHP_OUTPUT_HANDLER_STDFLAGS: phpv.ZInt(BufferCleanable|BufferFlushable|BufferRemovable)
type Buffer struct {
w io.Writer
b []byte
g *Global
level int
started bool
ImplicitFlush bool
ChunkSize int
CB phpv.Callable
}
type Flusher interface {
Flush() error
}
func makeBuffer(g *Global, w io.Writer) *Buffer {
if b, ok := w.(*Buffer); ok {
// this is a buffer
return &Buffer{
w: b,
g: g,
level: b.level + 1,
}
}
return &Buffer{
w: w,
g: g,
level: 1,
}
}
func (b *Buffer) add(d []byte, flag int) error {
if b.CB == nil {
if len(d) == 0 {
return nil
}
b.b = append(b.b, d...)
return nil
}
// pass d through output buffer callback
args := []*phpv.ZVal{phpv.ZString(d).ZVal(), phpv.ZInt(flag).ZVal()}
ctx := WithConfig(b.g, "ob_in_handler", phpv.ZBool(true).ZVal())
ctx = NewBufContext(ctx, nil)
r, err := ctx.CallZVal(ctx, b.CB, args, nil)
if err != nil {
return err
}
r, err = r.As(b.g, phpv.ZtString)
if err != nil {
return err
}
d = []byte(r.AsString(b.g))
if len(d) == 0 {
return nil
}
b.b = append(b.b, d...)
return nil
}
func (b *Buffer) Write(d []byte) (int, error) {
olen := len(d)
flag := BufferWrite | BufferFlush
if !b.started {
b.started = true
flag |= BufferStart
}
b.add(d, flag)
// should we flush
if b.ImplicitFlush {
return olen, b.Flush()
} else if (b.ChunkSize != 0) && (len(b.b) >= b.ChunkSize) {
return olen, b.Flush()
}
return olen, nil
}
func (b *Buffer) Flush() error {
// perform flush
for {
if len(b.b) == 0 {
return nil
}
n, err := b.w.Write(b.b)
if n == len(b.b) {
b.b = nil // do not keep buffer as to allow garbage collector
} else if n > 0 {
b.b = b.b[n:]
}
if err != nil {
return err
}
}
}
func (b *Buffer) Close() error {
if b.g.buf != b {
return errors.New("this buffer cannot be closed, not on top of stack")
}
flag := BufferFinal
if !b.started {
b.started = true
flag |= BufferStart
}
b.add(nil, flag)
err := b.Flush()
if err != nil {
return err
}
// get parent
if pbuf, ok := b.w.(*Buffer); ok {
// got parent
b.g.buf = pbuf
b.g.out = pbuf
return nil
}
// no parent
b.g.buf = nil
b.g.out = b.w
return nil
}
func (b *Buffer) Clean() {
b.b = nil
}
func (b *Buffer) Level() int {
return b.level
}
func (b *Buffer) Get() []byte {
return b.b
}