Esempio n. 1
0
func (this *ifExprs) addIfExpr(cond funcs.Bool, then, els *ast.Pattern) {
	// efficienctly append the then and else return to two copies of the current returns.
	if this.ret != nil {
		this.cond = cond
		thenterms := make([]*ast.Pattern, len(this.ret)+1)
		copy(thenterms, this.ret)
		thenterms[len(thenterms)-1] = then
		this.then = &ifExprs{ret: thenterms}
		this.els = &ifExprs{ret: append(this.ret, els)}
		this.ret = nil
		return
	}
	// remove duplicate condition
	if funcs.Equal(this.cond, cond) {
		this.then.addReturn(then)
		this.els.addReturn(els)
		return
	}
	// remove impossible (always false) then condition
	if funcs.IsFalse(funcs.Simplify(funcs.And(this.cond, cond))) {
		this.then.addReturn(els)
		this.els.addIfExpr(cond, then, els)
		return
	}
	// remove impossible (always false) else condition
	if funcs.IsFalse(funcs.Simplify(funcs.And(this.cond, funcs.Not(cond)))) {
		this.then.addIfExpr(cond, then, els)
		this.els.addReturn(then)
		return
	}
	this.then.addIfExpr(cond, then, els)
	this.els.addIfExpr(cond, then, els)
	return
}
Esempio n. 2
0
//NameToFunc compiles a parsed name expression into a function.
func NameToFunc(n *ast.NameExpr) funcs.Bool {
	typ := n.GetValue()
	switch v := typ.(type) {
	case *ast.Name:
		if v.DoubleValue != nil {
			return funcs.DoubleEq(funcs.DoubleVar(), funcs.DoubleConst(v.GetDoubleValue()))
		} else if v.IntValue != nil {
			return funcs.IntEq(funcs.IntVar(), funcs.IntConst(v.GetIntValue()))
		} else if v.UintValue != nil {
			return funcs.UintEq(funcs.UintVar(), funcs.UintConst(v.GetUintValue()))
		} else if v.BoolValue != nil {
			return funcs.BoolEq(funcs.BoolVar(), funcs.BoolConst(v.GetBoolValue()))
		} else if v.StringValue != nil {
			return funcs.StringEq(funcs.StringVar(), funcs.StringConst(v.GetStringValue()))
		} else if v.BytesValue != nil {
			return funcs.BytesEq(funcs.BytesVar(), funcs.BytesConst(v.GetBytesValue()))
		}
		panic(fmt.Sprintf("unknown name expr name %#v", v))
	case *ast.AnyName:
		return funcs.BoolConst(true)
	case *ast.AnyNameExcept:
		return funcs.Not(NameToFunc(v.GetExcept()))
	case *ast.NameChoice:
		return funcs.Or(NameToFunc(v.GetLeft()), NameToFunc(v.GetRight()))
	}
	panic(fmt.Sprintf("unknown name expr typ %T", typ))
}