From 92fbc7ce57b4ab992c7c406ad271caefcaf3e616 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 08:31:10 +0000
Subject: [PATCH 01/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 83b6d4c..e14da90 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -8,6 +8,7 @@ import (
 	"github.com/Krishanu230/Flipbook-Language/object"
 
 	"github.com/signintech/gopdf"
+	"github.com/disintegration/imaging"
 )
 
 var (
@@ -42,11 +43,16 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
 			return val
 		}
 
+	case *ast.SwirlEffectStatement:
+			val := evalSwirlEffect(node, env)
+			if isError(val) {
+				return val
+			}
 	case *ast.SaveStatement:
-		val := evalSave(node, env)
-		if isError(val) {
-			return val
-		}
+			val := evalSave(node, env)
+			if isError(val) {
+				return val
+			}
 	} //end of switch
 	return nil
 }
@@ -177,7 +183,8 @@ func evalKeyframe(inp *ast.KeyframeStatement, env *object.Environment) object.Ob
 }
 
 func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
-	r := evalIdentifier(inp.Book, env)
+	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
+	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
 	book, ok := r.(*object.Book)
 	if !ok {
 		return r

From 31905262e7bb3e398030fc60c4a4a3d5d4458566 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 08:40:27 +0000
Subject: [PATCH 02/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index e14da90..f7831f0 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -183,6 +183,18 @@ func evalKeyframe(inp *ast.KeyframeStatement, env *object.Environment) object.Ob
 }
 
 func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
+	r := evalIdentifier(inp.Book, env)
+	book, ok := r.(*object.Book)
+	if !ok {
+		return r
+	}
+	imgObj := evalIdentifier(inp.Image, env)
+	img, ok := imgObj.(*object.Image)
+	if !ok {
+		return imgObj
+	}
+	pdf := gopdf.GoPdf{}
+	pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: float64(book.DimX), H: float64(book.DimY)}})
 	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
 	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
 	book, ok := r.(*object.Book)

From 38e9d874f197fc377349b019431ade672f8e1211 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 08:52:12 +0000
Subject: [PATCH 03/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index f7831f0..66774ef 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -3,6 +3,7 @@ package evaluator
 import (
 	"fmt"
 	"strconv"
+	"image/color"
 
 	"github.com/Krishanu230/Flipbook-Language/ast"
 	"github.com/Krishanu230/Flipbook-Language/object"
@@ -183,6 +184,8 @@ func evalKeyframe(inp *ast.KeyframeStatement, env *object.Environment) object.Ob
 }
 
 func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
+	ix := 0
+	iy := 0
 	r := evalIdentifier(inp.Book, env)
 	book, ok := r.(*object.Book)
 	if !ok {
@@ -197,7 +200,7 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: float64(book.DimX), H: float64(book.DimY)}})
 	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
 	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
-	book, ok := r.(*object.Book)
+	book, ok = r.(*object.Book)
 	if !ok {
 		return r
 	}
@@ -220,8 +223,8 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 				println("ERROR1")
 				return newError("Image " + fname + " size larger than the page " + strconv.Itoa(pno))
 			}*/
-			ix := img.PosX
-			iy := img.PosY
+			ix = img.PosX
+			iy = img.PosY
 			if (ix > pw) || (iy > ph) {
 				return newError("Image " + fname + " position beyond the page " + strconv.Itoa(pno))
 			}

From 1081208084050a8c426fe4582003c93c5167752f Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 08:53:48 +0000
Subject: [PATCH 04/12] Sandbox run evaluator/evaluator.go

---
 evaluator/evaluator.go | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 66774ef..b6874ac 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -2,21 +2,21 @@ package evaluator
 
 import (
 	"fmt"
-	"strconv"
 	"image/color"
+	"strconv"
 
 	"github.com/Krishanu230/Flipbook-Language/ast"
 	"github.com/Krishanu230/Flipbook-Language/object"
 
-	"github.com/signintech/gopdf"
 	"github.com/disintegration/imaging"
+	"github.com/signintech/gopdf"
 )
 
 var (
 	NULL = &object.Null{}
 )
 
-//eval a ast node. recursive nature
+// eval a ast node. recursive nature
 func Eval(node ast.Node, env *object.Environment) object.Object {
 	switch node := node.(type) {
 
@@ -45,20 +45,20 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
 		}
 
 	case *ast.SwirlEffectStatement:
-			val := evalSwirlEffect(node, env)
-			if isError(val) {
-				return val
-			}
+		val := evalSwirlEffect(node, env)
+		if isError(val) {
+			return val
+		}
 	case *ast.SaveStatement:
-			val := evalSave(node, env)
-			if isError(val) {
-				return val
-			}
+		val := evalSave(node, env)
+		if isError(val) {
+			return val
+		}
 	} //end of switch
 	return nil
 }
 
-//eval a bunch of statements by passing them to Eval()
+// eval a bunch of statements by passing them to Eval()
 func evalStatements(sts []ast.Statement, env *object.Environment) object.Object {
 	var result object.Object
 
@@ -69,7 +69,7 @@ func evalStatements(sts []ast.Statement, env *object.Environment) object.Object
 	return result
 }
 
-//resolve an identifier
+// resolve an identifier
 func evalIdentifier(node *ast.Identifier, env *object.Environment) object.Object {
 	val, ok := env.Get(node.Value)
 	if ok {
@@ -78,7 +78,7 @@ func evalIdentifier(node *ast.Identifier, env *object.Environment) object.Object
 	return newError("identifier not found: " + node.Value)
 }
 
-//evaluate New type of statements
+// evaluate New type of statements
 func evalNew(inp *ast.NewStatement, env *object.Environment) object.Object {
 	st := *inp
 	if st.DType.Value == "image" {
@@ -96,7 +96,7 @@ func evalNew(inp *ast.NewStatement, env *object.Environment) object.Object {
 	return &object.Null{}
 }
 
-//evaluate Insert statements
+// evaluate Insert statements
 func evalInsert(inp *ast.InsertStatement, env *object.Environment) object.Object {
 	//env.Print()
 	r := evalIdentifier(inp.Image, env)
@@ -132,7 +132,7 @@ func evalInsert(inp *ast.InsertStatement, env *object.Environment) object.Object
 	return &object.Null{}
 }
 
-//evaluate keyframe statements
+// evaluate keyframe statements
 func evalKeyframe(inp *ast.KeyframeStatement, env *object.Environment) object.Object {
 	r := evalIdentifier(inp.Image, env)
 	img, ok := r.(*object.Image)
@@ -237,7 +237,7 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	return &object.Null{}
 }
 
-//Helper Functions
+// Helper Functions
 func isError(obj object.Object) bool {
 	if obj != nil {
 		return obj.Type() == object.ERROR_OBJ

From dc882ccda992c449889def081b8998e94ef08b6e Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 08:57:57 +0000
Subject: [PATCH 05/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index b6874ac..2c90b2d 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/Krishanu230/Flipbook-Language/ast"
 	"github.com/Krishanu230/Flipbook-Language/object"
+	"image/color"
 
 	"github.com/disintegration/imaging"
 	"github.com/signintech/gopdf"

From 91415cfd353a0e0a9856610f98e6cd754b8c88b1 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:02:20 +0000
Subject: [PATCH 06/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 2c90b2d..82dc191 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -7,7 +7,6 @@ import (
 
 	"github.com/Krishanu230/Flipbook-Language/ast"
 	"github.com/Krishanu230/Flipbook-Language/object"
-	"image/color"
 
 	"github.com/disintegration/imaging"
 	"github.com/signintech/gopdf"
@@ -197,7 +196,7 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	if !ok {
 		return imgObj
 	}
-	pdf := gopdf.GoPdf{}
+	pdf = gopdf.GoPdf{}
 	pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: float64(book.DimX), H: float64(book.DimY)}})
 	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
 	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)

From cf3a12065999f5b0050f1f11f2e94e46ac8118fc Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:06:12 +0000
Subject: [PATCH 07/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 82dc191..308bbdf 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -2,7 +2,6 @@ package evaluator
 
 import (
 	"fmt"
-	"image/color"
 	"strconv"
 
 	"github.com/Krishanu230/Flipbook-Language/ast"
@@ -200,7 +199,7 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: float64(book.DimX), H: float64(book.DimY)}})
 	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
 	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
-	book, ok = r.(*object.Book)
+	book, ok := r.(*object.Book)
 	if !ok {
 		return r
 	}

From a964cd9d5e94c275061858ac98a06a76c0b21e03 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:08:21 +0000
Subject: [PATCH 08/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 308bbdf..14743fa 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -8,6 +8,15 @@ import (
 	"github.com/Krishanu230/Flipbook-Language/object"
 
 	"github.com/disintegration/imaging"
+)
+
+func SwirlEffect(pages []object.PageProperty, rotationRate int) {
+	for i, page := range pages {
+		rotationAngle := i * rotationRate
+		for _, img := range page.ImagesProps {
+			img.Image = imaging.Rotate(img.Image, float64(rotationAngle), color.Transparent)
+		}
+	}
 	"github.com/signintech/gopdf"
 )
 
@@ -48,6 +57,16 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
 		if isError(val) {
 			return val
 		}
+	}
+	
+	func evalSwirlEffect(node *ast.SwirlEffectStatement, env *object.Environment) object.Object {
+	r := evalIdentifier(node.Book, env)
+	book, ok := r.(*object.Book)
+	if !ok {
+		return r
+	}
+	SwirlEffect(book.Pages, node.RotationRate.Value)
+	return &object.Null{}
 	case *ast.SaveStatement:
 		val := evalSave(node, env)
 		if isError(val) {
@@ -197,9 +216,13 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	}
 	pdf = gopdf.GoPdf{}
 	pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: float64(book.DimX), H: float64(book.DimY)}})
-	rotatedImg := imaging.Rotate(img.Image, float64(img.Rotation), color.Transparent)
-	pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
-	book, ok := r.(*object.Book)
+	for pno, page := range book.Pages {
+		pdf.AddPage()
+		for _, img := range page.ImagesProps {
+			rotatedImg := img.Image
+			pdf.Image(rotatedImg, float64(ix), float64(iy), nil)
+		}
+	}
 	if !ok {
 		return r
 	}

From bb69a1774147f05a152352e142732f960727e93c Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:10:53 +0000
Subject: [PATCH 09/12] feat: Updated lexer/lexer_test.go

---
 lexer/lexer_test.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lexer/lexer_test.go b/lexer/lexer_test.go
index 1e9156b..49d27e1 100644
--- a/lexer/lexer_test.go
+++ b/lexer/lexer_test.go
@@ -41,6 +41,10 @@ func TestNextToken(t *testing.T) {
 		{token.SCALE, "scale"},
 		{token.INT, "10"},
 		{token.SEMICOLON, ";"},
+		{token.SWIRL, "swirl"},
+		{token.IDN, "bookone"},
+		{token.INT, "10"},
+		{token.SEMICOLON, ";"},
 	}
 
 	l := NewLexer(input)

From 145581863d7726f28ccce93cab7db85fe28854de Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:14:11 +0000
Subject: [PATCH 10/12] feat: Updated README.md

---
 README.md | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index e87a4e7..40d844b 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,10 @@ go run main.go flipbook.flip
 
 ## Language Design
 
+5. SwirlEffect: This function applies a rotation transformation to each page of a flipbook, with the angle of rotation increasing for each subsequent page. The syntax is as follows:
+
+***swirl [Book ObjType variable] [Rotation Rate INT];***
+
 ### Rules:
 1. There are two type of objects in this language: Book and Image.
 
@@ -36,7 +40,7 @@ go run main.go flipbook.flip
 
     3.2 Integers: They are any positive integer.
 
-4. There are four types of Statements implemented right now: new, insert, keyframe, save. Every Statement must end with a semicolon.
+4. There are five types of Statements implemented right now: new, insert, keyframe, save, swirl. Every Statement must end with a semicolon.
 
     4.1 ***New***: It creates a new object
     Syntax -
@@ -61,7 +65,16 @@ go run main.go flipbook.flip
     ***save [Book ObjType variable] outputNameString***
 
 ## Example program
-Lets animate apple falling over newton's head.
+Lets animate apple falling over newton's head with a swirl effect.
+```
+new book bookone = ((1600,1600), 25);
+new image newton = ((100,100), "newton.png");
+insert newton bookone from page 1 to 25 at (600,1270);
+new image melon = ((100,100), "melon.png");
+insert melon bookone from page 1 to 25 at (600,0);
+keyframe melon bookone positionY (1,0) to (25, 1000);
+swirl bookone 10;
+save bookone "out.pdf";
 ```
 new book bookone = ((1600,1600), 25);
 new image newton = ((100,100), "newton.png");
@@ -90,5 +103,4 @@ KeyWords= {	new, at, to, set, image, book, scale, insert, from, page, keyframe,,
 1. Compelete the document: Due to the limitation of time, The documentation is not very resourceful.
 2.Clean Up the Code: Due to the same reason, I couldnt get the chance to properly refactor code and comment it.
 3. Add Expression pevaluation via Pratt's Parser technique
-4. Add an analouge of Functions as Effects like swirl
-5. Add more properties like opacity and more statements like 'set'.
+4. Add more properties like opacity and more statements like 'set'.

From 18981453e5286de7c9f8d587f24cdd80b30cb536 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:16:00 +0000
Subject: [PATCH 11/12] feat: Updated evaluator/evaluator.go

---
 evaluator/evaluator.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 14743fa..e746b65 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -236,7 +236,7 @@ func evalSave(inp *ast.SaveStatement, env *object.Environment) object.Object {
 	for pno, page := range book.Pages {
 		pdf.AddPage()
 		for _, img := range page.ImagesProps {
-			imgpath := img.Image.Filename
+			imgpath := img.Filename
 			//// TODO: implement scale property change by using a better library for pdf
 			/*iw := int(img.Image.DimX * (0))
 			ih := int(img.Image.DimX * (0))

From effb4a3f810febd90d25661fd4491a13cc493fd7 Mon Sep 17 00:00:00 2001
From: "sweep-ai[bot]" <128439645+sweep-ai[bot]@users.noreply.github.com>
Date: Thu, 19 Oct 2023 09:17:49 +0000
Subject: [PATCH 12/12] feat: Add tests for SwirlEffect and evalSwirlEffec

---
 evaluator/evaluator_test.go | 47 +++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 evaluator/evaluator_test.go

diff --git a/evaluator/evaluator_test.go b/evaluator/evaluator_test.go
new file mode 100644
index 0000000..74b5216
--- /dev/null
+++ b/evaluator/evaluator_test.go
@@ -0,0 +1,47 @@
+package evaluator
+
+import (
+	"testing"
+
+	"github.com/Krishanu230/Flipbook-Language/ast"
+	"github.com/Krishanu230/Flipbook-Language/object"
+)
+
+func TestSwirlEffect(t *testing.T) {
+	pages := []object.PageProperty{
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+	}
+	SwirlEffect(pages, 10)
+	if pages[0].ImagesProps[0].Image.Rotation != 0 || pages[1].ImagesProps[0].Image.Rotation != 10 {
+		t.Errorf("SwirlEffect did not correctly update the rotation of the images")
+	}
+}
+
+func TestEvalSwirlEffect(t *testing.T) {
+	env := object.NewEnvironment()
+	env.Set("bookone", &object.Book{Pages: []object.PageProperty{
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+	}})
+	node := &ast.SwirlEffectStatement{Book: &ast.Identifier{Value: "bookone"}, RotationRate: &ast.IntegerLiteral{Value: 10}}
+	evalSwirlEffect(node, env)
+	book, _ := env.Get("bookone")
+	if book.(*object.Book).Pages[0].ImagesProps[0].Image.Rotation != 0 || book.(*object.Book).Pages[1].ImagesProps[0].Image.Rotation != 10 {
+		t.Errorf("evalSwirlEffect did not correctly update the rotation of the images")
+	}
+}
+
+func TestEvalSave(t *testing.T) {
+	env := object.NewEnvironment()
+	env.Set("bookone", &object.Book{Pages: []object.PageProperty{
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+		{ImagesProps: []object.ImageProperty{{Image: object.Image{Rotation: 0}}}},
+	}})
+	node := &ast.SaveStatement{Book: &ast.Identifier{Value: "bookone"}, OutputName: &ast.StringLiteral{Value: "out.pdf"}}
+	evalSave(node, env)
+	book, _ := env.Get("bookone")
+	if book.(*object.Book).Pages[0].ImagesProps[0].Image.Rotation != 0 || book.(*object.Book).Pages[1].ImagesProps[0].Image.Rotation != 10 {
+		t.Errorf("evalSave did not correctly update the rotation of the images")
+	}
+}