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var_new.go
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var_new.go
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package exec
import (
"fmt"
"reflect"
qlang "github.com/xushiwei/qlang/spec"
)
// -----------------------------------------------------------------------------
// AssignEx
type iAssignEx int
func (p iAssignEx) Exec(stk *Stack, ctx *Context) {
v, ok1 := stk.Pop()
k, ok2 := stk.Pop()
if !ok1 || !ok2 {
panic(ErrAssignWithoutVal)
}
doAssign(k, v, ctx)
}
func doAssign(k, v interface{}, ctx *Context) {
switch t := k.(type) {
case *variable:
varRef := ctx.getVarRef(t.Name)
*varRef = v
case *qlang.DataIndex:
qlang.SetIndex(t.Data, t.Index, v)
default:
panic("invalid assignment statement")
}
}
const (
symbolNameBits = 20
symbolIndexMax = 1 << symbolNameBits
)
func (p *Context) getVarRef(name int) (varRef *interface{}) {
if name < symbolIndexMax {
return p.FastRefVar(name)
}
scope := name >> symbolNameBits
for scope > 0 {
p = p.parent
scope--
}
return p.FastRefVar(name & (symbolIndexMax - 1))
}
// AssignEx is qlang AssignEx instruction.
//
var AssignEx Instr = iAssignEx(0)
// -----------------------------------------------------------------------------
type iMultiAssignFromSliceEx int
func (p iMultiAssignFromSliceEx) Exec(stk *Stack, ctx *Context) {
arity := int(p)
args := stk.PopNArgs(arity + 1)
v := reflect.ValueOf(args[arity])
if v.Kind() != reflect.Slice {
panic(ErrMultiAssignExprMustBeSlice)
}
n := v.Len()
if arity != n {
panic(fmt.Errorf("multi assignment error: require %d variables, but we got %d", n, arity))
}
for i := 0; i < arity; i++ {
doAssign(args[i], v.Index(i).Interface(), ctx)
}
}
// MultiAssignFromSliceEx returns a MultiAssignFromSliceEx instruction.
//
func MultiAssignFromSliceEx(arity int) Instr {
return iMultiAssignFromSliceEx(arity)
}
// -----------------------------------------------------------------------------
type iMultiAssignEx int
func (p iMultiAssignEx) Exec(stk *Stack, ctx *Context) {
arity := int(p)
args := stk.PopNArgs(arity << 1)
for i := 0; i < arity; i++ {
doAssign(args[i], args[arity+i], ctx)
}
}
// MultiAssignEx returns a MultiAssignEx instruction.
//
func MultiAssignEx(arity int) Instr {
return iMultiAssignEx(arity)
}
// -----------------------------------------------------------------------------
// AddAssign/SubAssign/MulAssign/QuoAssign/ModAssign/Inc/Dec
func execOpAssignEx(p func(a, b interface{}) interface{}, stk *Stack, ctx *Context) {
v, ok1 := stk.Pop()
k, ok2 := stk.Pop()
if !ok1 || !ok2 {
panic(ErrAssignWithoutVal)
}
switch t := k.(type) {
case *variable:
name := t.Name
varRef := ctx.getVarRef(name)
*varRef = p(*varRef, v)
case *qlang.DataIndex:
val := qlang.Get(t.Data, t.Index)
val = p(val, v)
qlang.SetIndex(t.Data, t.Index, val)
default:
panic("invalid op assignment statement")
}
}
func execOp1AssignEx(p func(a interface{}) interface{}, stk *Stack, ctx *Context) {
k, ok := stk.Pop()
if !ok {
panic(ErrAssignWithoutVal)
}
switch t := k.(type) {
case *variable:
name := t.Name
varRef := ctx.getVarRef(name)
*varRef = p(*varRef)
case *qlang.DataIndex:
val := qlang.Get(t.Data, t.Index)
val = p(val)
qlang.SetIndex(t.Data, t.Index, val)
default:
panic("invalid op1 assignment statement")
}
}
// -----------------------------------------------------------------------------
type iAddAssignEx int
type iSubAssignEx int
type iMulAssignEx int
type iQuoAssignEx int
type iModAssignEx int
type iXorAssignEx int
type iBitAndAssignEx int
type iBitOrAssignEx int
type iAndNotAssignEx int
type iLshrAssignEx int
type iRshrAssignEx int
type iIncEx int
type iDecEx int
func (p iAddAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Add, stk, ctx)
}
func (p iSubAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Sub, stk, ctx)
}
func (p iMulAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Mul, stk, ctx)
}
func (p iQuoAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Quo, stk, ctx)
}
func (p iModAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Mod, stk, ctx)
}
func (p iXorAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Xor, stk, ctx)
}
func (p iBitAndAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.BitAnd, stk, ctx)
}
func (p iBitOrAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.BitOr, stk, ctx)
}
func (p iAndNotAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.AndNot, stk, ctx)
}
func (p iLshrAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Lshr, stk, ctx)
}
func (p iRshrAssignEx) Exec(stk *Stack, ctx *Context) {
execOpAssignEx(qlang.Rshr, stk, ctx)
}
func (p iIncEx) Exec(stk *Stack, ctx *Context) {
execOp1AssignEx(qlang.Inc, stk, ctx)
}
func (p iDecEx) Exec(stk *Stack, ctx *Context) {
execOp1AssignEx(qlang.Dec, stk, ctx)
}
var (
AddAssignEx Instr = iAddAssignEx(0)
SubAssignEx Instr = iSubAssignEx(0)
MulAssignEx Instr = iMulAssignEx(0)
QuoAssignEx Instr = iQuoAssignEx(0)
ModAssignEx Instr = iModAssignEx(0)
XorAssignEx Instr = iXorAssignEx(0)
BitAndAssignEx Instr = iBitAndAssignEx(0)
BitOrAssignEx Instr = iBitOrAssignEx(0)
AndNotAssignEx Instr = iAndNotAssignEx(0)
LshrAssignEx Instr = iLshrAssignEx(0)
RshrAssignEx Instr = iRshrAssignEx(0)
IncEx Instr = iIncEx(0)
DecEx Instr = iDecEx(0)
)
// -----------------------------------------------------------------------------