/
base_array.go
276 lines (185 loc) · 5.14 KB
/
base_array.go
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package bpl
import (
"bufio"
"io"
"reflect"
"unsafe"
"github.com/qiniu/x/bufiox"
)
// -----------------------------------------------------------------------------
func matchCharArray(n int, in *bufio.Reader, ctx *Context) (v interface{}, err error) {
if n == 0 {
return "", nil
}
b := make([]byte, n)
_, err = io.ReadFull(in, b)
if err != nil {
return
}
return string(b), nil
}
func matchByteArray(n int, in *bufio.Reader, ctx *Context) (v interface{}, err error) {
if n == 0 {
return []byte(nil), nil
}
b := make([]byte, n)
_, err = io.ReadFull(in, b)
if err != nil {
return
}
return b, nil
}
func matchBaseArray(R BaseType, n int, in *bufio.Reader, ctx *Context) (v interface{}, err error) {
if n == 0 {
return
}
t := baseTypes[R]
v = t.newn(n)
data := (*reflect.SliceHeader)(unsafe.Pointer(reflect.ValueOf(v).UnsafeAddr())).Data
b := (*[1 << 30]byte)(unsafe.Pointer(data))
_, err = io.ReadFull(in, b[:n*t.sizeOf])
return
}
// -----------------------------------------------------------------------------
type baseArray struct {
r BaseType
n int
}
func (p *baseArray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
n := p.n
return matchBaseArray(p.r, n, in, ctx)
}
func (p *baseArray) RetType() reflect.Type {
return reflect.SliceOf(p.r.RetType())
}
func (p *baseArray) SizeOf() int {
return p.r.SizeOf() * p.n
}
// BaseArray returns a matching unit that matches R n times.
//
func BaseArray(r BaseType, n int) Ruler {
return &baseArray{r: r, n: n}
}
// -----------------------------------------------------------------------------
type baseDynarray struct {
r BaseType
n func(ctx *Context) int
}
func (p *baseDynarray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
n := p.n(ctx)
return matchBaseArray(p.r, n, in, ctx)
}
func (p *baseDynarray) RetType() reflect.Type {
return reflect.SliceOf(p.r.RetType())
}
func (p *baseDynarray) SizeOf() int {
return -1
}
// BaseDynarray returns a matching unit that matches R n(ctx) times.
//
func BaseDynarray(r BaseType, n func(ctx *Context) int) Ruler {
return &baseDynarray{r: r, n: n}
}
// -----------------------------------------------------------------------------
type byteArray0 int
func (p byteArray0) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
v, err = bufiox.ReadAll(in)
return
}
func (p byteArray0) RetType() reflect.Type {
return tyByteSlice
}
func (p byteArray0) SizeOf() int {
return -1
}
// ByteArray0 is a matching unit that matches `*byte`.
//
var ByteArray0 Ruler = byteArray0(0)
// -----------------------------------------------------------------------------
type byteArray1 int
func (p byteArray1) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
ret, err := bufiox.ReadAll(in)
if err != nil {
return
}
if len(ret) == 0 {
panic("match +byte failed: EOF encountered")
}
return ret, nil
}
func (p byteArray1) RetType() reflect.Type {
return tyByteSlice
}
func (p byteArray1) SizeOf() int {
return -1
}
// ByteArray1 is a matching unit that matches `+byte`.
//
var ByteArray1 Ruler = byteArray1(0)
// -----------------------------------------------------------------------------
type byteArray int
func (p byteArray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
return matchByteArray(int(p), in, ctx)
}
func (p byteArray) RetType() reflect.Type {
return tyByteSlice
}
func (p byteArray) SizeOf() int {
return int(p)
}
// ByteArray returns a matching unit that matches `[n]byte`.
//
func ByteArray(n int) Ruler {
return byteArray(n)
}
// -----------------------------------------------------------------------------
type charArray int
func (p charArray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
return matchCharArray(int(p), in, ctx)
}
func (p charArray) RetType() reflect.Type {
return tyString
}
func (p charArray) SizeOf() int {
return int(p)
}
// CharArray returns a matching unit that matches `[n]char`.
//
func CharArray(n int) Ruler {
return charArray(n)
}
// -----------------------------------------------------------------------------
type byteDynarray func(ctx *Context) int
func (p byteDynarray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
n := p(ctx)
return matchByteArray(n, in, ctx)
}
func (p byteDynarray) RetType() reflect.Type {
return tyByteSlice
}
func (p byteDynarray) SizeOf() int {
return -1
}
// ByteDynarray returns a matching unit that matches `[n(ctx)]byte`.
//
func ByteDynarray(n func(ctx *Context) int) Ruler {
return byteDynarray(n)
}
// -----------------------------------------------------------------------------
type charDynarray func(ctx *Context) int
func (p charDynarray) Match(in *bufio.Reader, ctx *Context) (v interface{}, err error) {
n := p(ctx)
return matchCharArray(n, in, ctx)
}
func (p charDynarray) RetType() reflect.Type {
return tyString
}
func (p charDynarray) SizeOf() int {
return -1
}
// CharDynarray returns a matching unit that matches `[n(ctx)]char`.
//
func CharDynarray(n func(ctx *Context) int) Ruler {
return charDynarray(n)
}
// -----------------------------------------------------------------------------