/
stream.go
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/
stream.go
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/*
MIT License
Copyright (c) 2018,2020 ifritJP
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
package lnsgoruntime
import "os"
import "io"
import "bytes"
import "strings"
import "fmt"
import "bufio"
type Lns_iStream interface {
Read( arg LnsAny ) LnsAny
Close()
}
type LnsReader struct {
bufReader *bufio.Reader
orgReader io.Reader
}
func NewLnsReader( reader io.Reader ) *LnsReader {
lnsReader := LnsReader{}
lnsReader.orgReader = reader
lnsReader.bufReader = nil
return &lnsReader
}
func (self *LnsReader) Sync() {
self.bufReader = nil
}
func (self *LnsReader) Read( arg LnsAny) LnsAny {
if self.bufReader == nil {
self.bufReader = bufio.NewReader( self.orgReader )
}
switch arg.(type) {
case string:
mode := arg.(string)
switch mode {
case "*a":
buffer := bytes.Buffer{}
buffer.Reset()
buf := make([]byte,1024 * 100)
for {
readSize, err := self.bufReader.Read( buf )
if err != nil && err != io.EOF {
break
}
if err == io.EOF && readSize == 0 {
break
}
buffer.Write( buf[:readSize] )
}
ret := buffer.Bytes()
if len( ret ) == 0 {
return nil
}
return string(ret)
case "*l":
buf, err := self.bufReader.ReadBytes( '\n' )
if err != nil && err != io.EOF {
return nil
}
if len( buf ) == 0 {
return nil
}
if buf[ len( buf ) - 1 ] == '\n' {
// 改行を除外して返す
return string( buf[ : len( buf ) - 1 ] )
}
return string( buf )
default:
panic( fmt.Sprintf( "not support -- %s", mode ) );
}
case LnsInt:
buf := make([]byte, arg.(LnsInt) )
size, err := self.bufReader.Read( buf )
if err != nil && err != io.EOF {
return nil
}
if size == 0 {
return nil
}
return string( buf[ :size] )
default:
panic( fmt.Sprintf( "not support -- %s", arg ) );
}
}
type Lns_stdin_t struct {
reader *LnsReader
FP Lns_iStream
}
var Lns_io_stdin *Lns_stdin_t
func (self *Lns_stdin_t) Read( arg LnsAny) LnsAny {
return self.reader.Read( arg )
}
func (self *Lns_stdin_t) Close() {
}
type Lns_oStream interface {
Write( arg string ) (LnsAny, LnsAny)
Flush()
Close()
}
type Lns_stdout_t struct {
FP Lns_oStream
}
var Lns_io_stdout *Lns_stdout_t
var Lns_io_stderr *Lns_stdout_t
func (self *Lns_stdout_t) Write( arg string ) (LnsAny, LnsAny) {
var stream io.Writer
if self == Lns_io_stdout {
stream = os.Stdout
} else {
stream = os.Stderr
}
_, err := stream.Write( []byte(arg) )
return self, err
}
func (self *Lns_stdout_t) Flush() {
}
func (self *Lns_stdout_t) Close() {
}
//================== io.open
type Lns_luaStream interface {
Read( arg LnsAny ) LnsAny
Write( arg string ) (LnsAny, LnsAny)
Flush()
Close()
Seek( kind string, pos LnsInt ) (LnsAny, LnsAny)
}
type Lns_FileObj_t struct {
fileObj *os.File
reader *LnsReader
FP Lns_luaStream
}
func Lns_io_open( path string, mode LnsAny ) (LnsAny,LnsAny) {
var modeStr string
if mode == nil {
modeStr = "r";
} else {
modeStr = mode.(string)
}
flag := 0
if strings.Index( modeStr, "a" ) != -1 || strings.Index( modeStr, "w" ) != -1 {
// a, w いずれかの場合
flag |= os.O_RDWR
if strings.Index( modeStr, "a" ) == -1 {
// a がなければ create
flag |= os.O_CREATE
}
if strings.Index( modeStr, "a" ) != -1 && strings.Index( modeStr, "+" ) != -1 {
// a+ は append
flag |= os.O_APPEND
} else {
flag |= os.O_TRUNC
}
} else {
flag |= os.O_RDONLY
}
if fileObj, err := os.OpenFile( path, flag, 0666 ); err != nil {
return nil, err.Error()
} else {
obj := &Lns_FileObj_t{ fileObj, nil, nil }
obj.reader = NewLnsReader( fileObj )
obj.FP = obj
return obj, nil
}
}
func (self *Lns_FileObj_t) Read( arg LnsAny) LnsAny {
return self.reader.Read( arg )
}
func (self *Lns_FileObj_t) Write( arg string ) (LnsAny, LnsAny) {
self.reader.Sync()
_, err := self.fileObj.Write( []byte(arg) )
return self, err
}
func (self *Lns_FileObj_t) Close() {
if self.fileObj != nil {
self.fileObj.Close()
self.fileObj = nil
}
}
func (self *Lns_FileObj_t) Flush() {
self.fileObj.Sync()
}
func (self *Lns_FileObj_t) Seek( kind string, pos LnsInt ) (LnsAny, LnsAny) {
self.reader.Sync()
var ret int64
var err error
switch kind {
case "set":
ret, err = self.fileObj.Seek( int64(pos), os.SEEK_SET )
case "cur":
ret, err = self.fileObj.Seek( int64(pos), os.SEEK_CUR )
case "end":
ret, err = self.fileObj.Seek( int64(pos), os.SEEK_END )
default:
panic( fmt.Sprintf( "not support -- %s", kind ) )
}
if err != nil {
return nil, err.Error()
}
return LnsInt(ret), nil
}
func init() {
Lns_io_stdin = &Lns_stdin_t{}
Lns_io_stdin.FP = Lns_io_stdin;
Lns_io_stdin.reader = NewLnsReader( os.Stdin )
Lns_io_stdout = &Lns_stdout_t{}
Lns_io_stdout.FP = Lns_io_stdout
Lns_io_stderr = &Lns_stdout_t{}
Lns_io_stderr.FP = Lns_io_stderr
}