/
macro_object.go
128 lines (108 loc) · 3.13 KB
/
macro_object.go
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package mjingo
import (
"fmt"
"strings"
"github.com/hnakamur/mjingo/internal/datast/hashset"
"github.com/hnakamur/mjingo/internal/datast/slicex"
"github.com/hnakamur/mjingo/option"
)
type macroData struct {
name string
argSpec []string
macroRefID uint
closure Value
callerReference bool
}
type macro struct {
data macroData
}
var _ = (Object)((*macro)(nil))
var _ = (Caller)((*macro)(nil))
var _ = (StructObject)((*macro)(nil))
func (m *macro) String() string {
return fmt.Sprintf("<macro %s>", m.data.name)
}
func (m *macro) Kind() ObjectKind { return ObjectKindStruct }
func (m *macro) Call(state *State, args []Value) (Value, error) {
var kwargs *valueMap
if len(args) > 0 {
if mapVal, ok := args[len(args)-1].data.(mapValue); ok && mapVal.Type == mapTypeKwargs {
kwargs = mapVal.Map
args = args[:len(args)-1]
}
}
if len(args) > len(m.data.argSpec) {
return Value{}, NewError(TooManyArguments, "")
}
kwargsUsed := hashset.NewStrHashSet()
argValues := make([]Value, 0, len(m.data.argSpec))
for i, name := range m.data.argSpec {
var kwarg Value
if kwargs != nil {
kwarg, _ = kwargs.Get(keyRefFromValue(valueFromString(name)))
}
var arg Value
switch {
case i < len(args) && kwarg.data != nil:
return Value{}, NewError(TooManyArguments, fmt.Sprintf("duplicate argument `%s`", name))
case i < len(args) && kwarg.data == nil:
arg = args[i].clone()
case i >= len(args) && kwarg.data != nil:
kwargsUsed.Add(name)
arg = kwarg.clone()
default:
arg = Undefined
}
argValues = append(argValues, arg)
}
caller := option.None[Value]()
if m.data.callerReference {
kwargsUsed.Add("caller")
// option.AndThen(kwargs)
caller = option.Some[Value](Undefined)
if kwargs != nil {
if v, ok := kwargs.Get(keyRefFromString("caller")); ok {
caller = option.Some(v)
}
}
}
if kwargs != nil {
for _, keyRef := range kwargs.Keys() {
if optKey := keyRef.AsStr(); optKey.IsSome() {
if !kwargsUsed.Contains(optKey.Unwrap()) {
return Value{}, NewError(TooManyArguments,
fmt.Sprintf("unknown keyword argument `%s`", optKey.Unwrap()))
}
}
}
}
instsAndOffset := state.macros[m.data.macroRefID]
insts := instsAndOffset.insts
offset := instsAndOffset.offset
vm := newVirtualMachine(state.env)
var b strings.Builder
out := newOutput(&b)
closure := m.data.closure.clone()
if _, err := vm.evalMacro(insts, offset, closure, caller, out, state, argValues); err != nil {
return Value{}, err
}
if _, ok := state.autoEscape.(autoEscapeNone); !ok {
return ValueFromSafeString(b.String()), nil
}
return valueFromString(b.String()), nil
}
func (m *macro) StaticFields() option.Option[[]string] {
return option.Some([]string{"name", "arguments", "caller"})
}
func (m *macro) GetField(name string) option.Option[Value] {
switch name {
case "name":
return option.Some(valueFromString(m.data.name))
case "arguments":
return option.Some(valueFromSlice(slicex.Map(m.data.argSpec, valueFromString)))
case "caller":
return option.Some(valueFromBool(m.data.callerReference))
}
return option.None[Value]()
}
func (m *macro) Fields() []string { return nil }