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scope.go
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scope.go
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package yakvm
import "sync"
type Scope struct {
verbose string
mu sync.Mutex
symtbl *SymbolTable
parent *Scope
idToValue map[int]*Value
}
// NewScope Create Root Scope
// NewVirtualMachine Called Generally
func NewScope(table *SymbolTable) *Scope {
return &Scope{
verbose: table.Verbose,
symtbl: table,
parent: nil,
idToValue: make(map[int]*Value),
}
}
func (s *Scope) SetVerbose(v string) {
s.verbose = v
}
func (s *Scope) GetSymTable() *SymbolTable {
return s.symtbl
}
func (s *Scope) SetSymTable(symtbl *SymbolTable) {
s.symtbl = symtbl
}
func (s *Scope) CreateSubScope(table *SymbolTable) *Scope {
return &Scope{
verbose: table.Verbose,
symtbl: table,
parent: s,
idToValue: make(map[int]*Value),
}
}
func (s *Scope) IsRoot() bool {
return s.parent == nil
}
func (s *Scope) Len() int {
return len(s.idToValue)
}
func (s *Scope) GetValueByName(name string) (*Value, bool) {
if s == nil {
return nil, false
}
id, ok := s.symtbl.GetSymbolByVariableName(name)
if !ok {
return nil, false
}
val, ok := s.GetValueByID(id)
if val == nil {
val = undefined
}
return val, ok
}
func (s *Scope) GetNameById(id int) string {
tbl := s.GetSymTable()
if tbl == nil {
return ""
}
raw, _ := tbl.GetNameByVariableId(id)
return raw
}
func (s *Scope) GetIdByName(name string) int {
tbl := s.GetSymTable()
if tbl == nil {
return 0
}
raw, _ := tbl.GetSymbolByVariableName(name)
return raw
}
func (s *Scope) GetValueByID(id int) (*Value, bool) {
if s == nil {
return nil, false
}
s.mu.Lock()
raw, ok := s.idToValue[id]
s.mu.Unlock()
if ok {
return raw, true
}
return s.parent.GetValueByID(id)
}
func (s *Scope) NewValueByID(id int, v *Value) {
s.mu.Lock()
s.idToValue[id] = v
s.mu.Unlock()
}
func (s *Scope) InCurrentScope(id int) bool {
if s == nil {
return false
}
s.mu.Lock()
_, ok := s.idToValue[id]
s.mu.Unlock()
return ok
}
func (s *Scope) GetAllIdInScopes() []int {
s.mu.Lock()
defer s.mu.Unlock()
var ids []int
for i := range s.idToValue {
ids = append(ids, i)
}
return ids
}
func (s *Scope) GetAllNameAndValueInScopes() (results map[string]*Value) {
results = make(map[string]*Value)
for id, value := range s.idToValue {
name := s.GetNameById(id)
if name == "" || name == "_" {
continue
}
results[name] = value
}
return
}
func (s *Scope) GetAllNameAndValueInAllScopes() (results map[string]*Value) {
results = make(map[string]*Value)
scope := s
for scope != nil {
for id, value := range scope.idToValue {
name := scope.GetNameById(id)
if name == "" || name == "_" {
continue
}
if _, ok := results[name]; !ok {
results[name] = value
}
}
scope = scope.parent
}
return
}