129 lines
2.4 KiB
Go
129 lines
2.4 KiB
Go
package tengo
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import (
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"fmt"
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"github.com/d5/tengo/compiler"
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"github.com/d5/tengo/objects"
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"github.com/d5/tengo/parser"
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"github.com/d5/tengo/scanner"
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"github.com/d5/tengo/vm"
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)
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type Variable struct {
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name string
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value *objects.Object
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}
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func (v *Variable) Name() string {
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return v.name
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}
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func (v *Variable) Value() interface{} {
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return nil
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}
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type Script struct {
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variables map[string]*objects.Object
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input []byte
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}
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func NewScript(input []byte) *Script {
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return &Script{
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variables: make(map[string]*objects.Object),
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input: input,
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}
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}
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func (s *Script) Add(name string, value interface{}) error {
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obj, err := objects.FromValue(value)
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if err != nil {
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return err
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}
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s.variables[name] = &obj
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return nil
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}
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func (s *Script) Remove(name string) bool {
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if _, ok := s.variables[name]; !ok {
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return false
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}
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delete(s.variables, name)
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return true
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}
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func (s *Script) Compile() (*CompiledScript, error) {
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symbolTable, globals := s.prepCompile()
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fileSet := scanner.NewFileSet()
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p := parser.NewParser(fileSet.AddFile("", -1, len(s.input)), s.input, nil)
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file, err := p.ParseFile()
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if err != nil {
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return nil, fmt.Errorf("parse error: %s", err.Error())
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}
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c := compiler.NewCompiler(symbolTable, nil)
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if err := c.Compile(file); err != nil {
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return nil, err
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}
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return &CompiledScript{
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bytecode: c.Bytecode(),
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symbolTable: symbolTable,
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globals: globals,
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}, nil
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}
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func (s *Script) prepCompile() (symbolTable *compiler.SymbolTable, globals []*objects.Object) {
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var names []string
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for name := range s.variables {
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names = append(names, name)
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}
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symbolTable = compiler.NewSymbolTable()
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globals = make([]*objects.Object, len(names), len(names))
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for idx, name := range names {
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symbol := symbolTable.Define(name)
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if symbol.Index != idx {
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panic(fmt.Errorf("wrong symbol index: %d != %d", idx, symbol.Index))
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}
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globals[symbol.Index] = s.variables[name]
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}
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return
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}
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type CompiledScript struct {
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bytecode *compiler.Bytecode
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symbolTable *compiler.SymbolTable
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globals []*objects.Object
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}
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func (c *CompiledScript) Run() error {
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v := vm.NewVM(c.bytecode, c.globals)
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return v.Run()
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}
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func (c *CompiledScript) Update(name string, value interface{}) error {
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symbol, _, ok := c.symbolTable.Resolve(name)
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if !ok {
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return fmt.Errorf("name not found: %s", name)
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}
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updated, err := objects.FromValue(value)
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if err != nil {
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return err
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}
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c.globals[symbol.Index] = &updated
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return nil
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}
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