add constructor

postscript-go/src/cmd/testpostscript.go

@@ -6,7 +6,9 @@ import (
 	"time"
 	"log"
 	"os"
+	"io/ioutil"
 	"bufio"
+	"strings"
 	"image"
 	"image/png"
 	"draw2d.googlecode.com/svn/trunk/draw2d/src/pkg/draw2d"
@@ -43,8 +45,15 @@ func main() {
 	gc.Scale(1, -1)
 	gc.Translate(0, -380)
 	lastTime := time.Nanoseconds()
+	src, err := os.Open("../../test_files/tiger.ps", 0, 0)
+	if err != nil {
+		return 
+	}
+	defer src.Close()
+	bytes, err := ioutil.ReadAll(src)
+	reader := strings.NewReader(string(bytes))
 	interpreter := postscript.NewInterpreter(gc)
-	interpreter.ExecuteFile("../../test_files/tiger.ps")
+	interpreter.Execute(reader)
 	dt := time.Nanoseconds() - lastTime
 	fmt.Printf("Draw image: %f ms\n", float64(dt)*1e-6)
 	saveToPngFile("../../TestPostscript.png", i)

postscript-go/src/pkg/postscript/Makefile

@@ -1,16 +1,18 @@
 include $(GOROOT)/src/Make.inc
 
 TARG=postscript-go.googlecode.com/svn/trunk/postscript-go/src/pkg/postscript
-GOFILES=\
+GOFILES=operators_array.go\
+	operators_dictionary.go\
+	operators_misc.go\
+	procedure.go\
 	interpreter.go\
+	operators_conflict.go\
+	operators_graphics.go\
+	operators_relational.go\
+	scanner.go\
 	operators.go\
 	operators_control.go\
-	operators_dictionary.go\
-	operators_graphics.go\
 	operators_math.go\
-	operators_relational.go\
 	operators_stack.go\
-	procedure.go\
-	scanner.go\
 
 include $(GOROOT)/src/Make.pkg

postscript-go/src/pkg/postscript/interpreter.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"log"
 	"strconv"
+	"io"
 	"draw2d.googlecode.com/svn/trunk/draw2d/src/pkg/draw2d"
 )
 
@@ -47,21 +48,26 @@ func NewDictionary(prealloc int) Dictionary {
 func (interpreter *Interpreter) GetGraphicContext() *draw2d.GraphicContext {
 	return interpreter.gc
 }
-
-func (interpreter *Interpreter) ExecuteFile(filePath string) {
-	src, err := os.Open(filePath, 0, 0)
-	if src == nil {
-		log.Printf("can't open file; err=%s\n", err.String())
-		return
-	}
+func (interpreter *Interpreter) Execute(reader io.Reader) {
 	var scanner Scanner
-	scanner.Init(src)
+	scanner.Init(reader)
 	token := scanner.Scan()
 	for token != EOF {
 		interpreter.scan(&scanner, token)
 		token = scanner.Scan()
 	}
 }
+
+func (interpreter *Interpreter) ExecuteFile(filePath string) os.Error {
+	src, err := os.Open(filePath, 0, 0)
+	if src == nil {
+		log.Printf("can't open file; err=%s\n", err.String())
+		return err
+	}
+	defer src.Close()
+	interpreter.Execute(src)
+	return nil
+}
 func (interpreter *Interpreter) computeReference(ref string) {
 	value, _ := interpreter.FindValueInDictionaries(ref)
 	if value == nil {