expressions working

Signed-off-by: Casey Lee <cplee@nektos.com>

vendor/github.com/robertkrimen/otto/script.go

@@ -0,0 +1,119 @@
+package otto
+
+import (
+	"bytes"
+	"encoding/gob"
+	"errors"
+)
+
+var ErrVersion = errors.New("version mismatch")
+
+var scriptVersion = "2014-04-13/1"
+
+// Script is a handle for some (reusable) JavaScript.
+// Passing a Script value to a run method will evaluate the JavaScript.
+//
+type Script struct {
+	version  string
+	program  *_nodeProgram
+	filename string
+	src      string
+}
+
+// Compile will parse the given source and return a Script value or nil and
+// an error if there was a problem during compilation.
+//
+//      script, err := vm.Compile("", `var abc; if (!abc) abc = 0; abc += 2; abc;`)
+//      vm.Run(script)
+//
+func (self *Otto) Compile(filename string, src interface{}) (*Script, error) {
+	return self.CompileWithSourceMap(filename, src, nil)
+}
+
+// CompileWithSourceMap does the same thing as Compile, but with the obvious
+// difference of applying a source map.
+func (self *Otto) CompileWithSourceMap(filename string, src, sm interface{}) (*Script, error) {
+	program, err := self.runtime.parse(filename, src, sm)
+	if err != nil {
+		return nil, err
+	}
+
+	cmpl_program := cmpl_parse(program)
+
+	script := &Script{
+		version:  scriptVersion,
+		program:  cmpl_program,
+		filename: filename,
+		src:      program.File.Source(),
+	}
+
+	return script, nil
+}
+
+func (self *Script) String() string {
+	return "// " + self.filename + "\n" + self.src
+}
+
+// MarshalBinary will marshal a script into a binary form. A marshalled script
+// that is later unmarshalled can be executed on the same version of the otto runtime.
+//
+// The binary format can change at any time and should be considered unspecified and opaque.
+//
+func (self *Script) marshalBinary() ([]byte, error) {
+	var bfr bytes.Buffer
+	encoder := gob.NewEncoder(&bfr)
+	err := encoder.Encode(self.version)
+	if err != nil {
+		return nil, err
+	}
+	err = encoder.Encode(self.program)
+	if err != nil {
+		return nil, err
+	}
+	err = encoder.Encode(self.filename)
+	if err != nil {
+		return nil, err
+	}
+	err = encoder.Encode(self.src)
+	if err != nil {
+		return nil, err
+	}
+	return bfr.Bytes(), nil
+}
+
+// UnmarshalBinary will vivify a marshalled script into something usable. If the script was
+// originally marshalled on a different version of the otto runtime, then this method
+// will return an error.
+//
+// The binary format can change at any time and should be considered unspecified and opaque.
+//
+func (self *Script) unmarshalBinary(data []byte) error {
+	decoder := gob.NewDecoder(bytes.NewReader(data))
+	err := decoder.Decode(&self.version)
+	if err != nil {
+		goto error
+	}
+	if self.version != scriptVersion {
+		err = ErrVersion
+		goto error
+	}
+	err = decoder.Decode(&self.program)
+	if err != nil {
+		goto error
+	}
+	err = decoder.Decode(&self.filename)
+	if err != nil {
+		goto error
+	}
+	err = decoder.Decode(&self.src)
+	if err != nil {
+		goto error
+	}
+	return nil
+error:
+	self.version = ""
+	self.program = nil
+	self.filename = ""
+	self.src = ""
+	return err
+}