mirror of
https://github.com/robertkrimen/otto
synced 2025-10-12 20:27:30 +08:00
7009038f79
Disable new linters which aren't compatible with this code module. Upgrade github actions to fix caching issues. Run go mod to bring in new styling. Remove space on nolint declarations. Apply all changes to whitespace as required to pass goimports linter. Only trigger checks on pull_request which works for pulls from other forks, where as push only works from the same repo.
110 lines
2.8 KiB
Go
110 lines
2.8 KiB
Go
package otto
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import (
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"bytes"
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"encoding/gob"
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"errors"
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)
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var ErrVersion = errors.New("version mismatch")
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var scriptVersion = "2014-04-13/1"
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// Script is a handle for some (reusable) JavaScript.
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// Passing a Script value to a run method will evaluate the JavaScript.
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type Script struct {
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version string
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program *_nodeProgram
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filename string
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src string
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}
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// Compile will parse the given source and return a Script value or nil and
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// an error if there was a problem during compilation.
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//
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// script, err := vm.Compile("", `var abc; if (!abc) abc = 0; abc += 2; abc;`)
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// vm.Run(script)
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func (self *Otto) Compile(filename string, src interface{}) (*Script, error) {
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return self.CompileWithSourceMap(filename, src, nil)
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}
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// CompileWithSourceMap does the same thing as Compile, but with the obvious
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// difference of applying a source map.
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func (self *Otto) CompileWithSourceMap(filename string, src, sm interface{}) (*Script, error) {
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program, err := self.runtime.parse(filename, src, sm)
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if err != nil {
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return nil, err
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}
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cmpl_program := cmpl_parse(program)
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script := &Script{
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version: scriptVersion,
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program: cmpl_program,
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filename: filename,
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src: program.File.Source(),
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}
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return script, nil
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}
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func (self *Script) String() string {
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return "// " + self.filename + "\n" + self.src
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}
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// MarshalBinary will marshal a script into a binary form. A marshalled script
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// that is later unmarshalled can be executed on the same version of the otto runtime.
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//
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// The binary format can change at any time and should be considered unspecified and opaque.
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func (self *Script) marshalBinary() ([]byte, error) {
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var bfr bytes.Buffer
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encoder := gob.NewEncoder(&bfr)
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err := encoder.Encode(self.version)
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if err != nil {
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return nil, err
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}
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err = encoder.Encode(self.program)
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if err != nil {
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return nil, err
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}
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err = encoder.Encode(self.filename)
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if err != nil {
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return nil, err
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}
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err = encoder.Encode(self.src)
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if err != nil {
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return nil, err
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}
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return bfr.Bytes(), nil
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}
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// UnmarshalBinary will vivify a marshalled script into something usable. If the script was
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// originally marshalled on a different version of the otto runtime, then this method
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// will return an error.
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//
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// The binary format can change at any time and should be considered unspecified and opaque.
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func (self *Script) unmarshalBinary(data []byte) (err error) {
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decoder := gob.NewDecoder(bytes.NewReader(data))
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defer func() {
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if err != nil {
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self.version = ""
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self.program = nil
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self.filename = ""
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self.src = ""
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}
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}()
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if err = decoder.Decode(&self.version); err != nil {
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return err
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}
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if self.version != scriptVersion {
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return ErrVersion
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}
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if err = decoder.Decode(&self.program); err != nil {
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return err
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}
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if err = decoder.Decode(&self.filename); err != nil {
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return err
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}
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return decoder.Decode(&self.src)
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}
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