Implemented commands until helloworld works \o/

10 files changed, 243 insertions, 44 deletions

diff --git a/go.mod b/go.mod
index 718a815..4dea3d5 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,8 @@ require github.com/stretchr/testify v1.7.0
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pkg/term v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20200909081042-eff7692f9009 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )
diff --git a/go.sum b/go.sum
index c221f64..edc2e45 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,15 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pkg/term v1.1.0 h1:xIAAdCMh3QIAy+5FrE8Ad8XoDhEU4ufwbaSozViP9kk=
+github.com/pkg/term v1.1.0/go.mod h1:E25nymQcrSllhX42Ok8MRm1+hyBdHY0dCeiKZ9jpNGw=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009 h1:W0lCpv29Hv0UaM1LXb9QlBHLNP8UFfcKjblhVCWftOM=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/pkg/interpreter/interpreter.go b/pkg/interpreter/interpreter.go
index 76917b7..433f264 100644
--- a/pkg/interpreter/interpreter.go
+++ b/pkg/interpreter/interpreter.go
@@ -16,14 +16,14 @@ func NewInterpreter(f *field.Field, p *pointer.Pointer) *Interpreter {
 
 func (i *Interpreter) Run() int {
 	for i.p != nil {
-		if v := i.Step(); v != nil {
+		if v := i.step(); v != nil {
 			return *v
 		}
 	}
 	return 0
 }
 
-func (i *Interpreter) Step() *int {
+func (i *Interpreter) step() *int {
 	var prev *pointer.Pointer = nil
 	for p := i.p; p != nil; p = p.Next {
 		done, v := p.Exec(i.f)
diff --git a/pkg/interpreter/interpreter_test.go b/pkg/interpreter/interpreter_test.go
index ff633a2..73902b2 100644
--- a/pkg/interpreter/interpreter_test.go
+++ b/pkg/interpreter/interpreter_test.go
@@ -38,7 +38,7 @@ func TestStep(t *testing.T) {
 			if tc.pointer == nil {
 				tc.pointer = pointer.NewPointer()
 			}
-			NewInterpreter(f, tc.pointer).Step()
+			NewInterpreter(f, tc.pointer).step()
 			if tc.expectedField != nil {
 				require.Equal(t, tc.expectedField, f)
 			}
diff --git a/pkg/pointer/exec.go b/pkg/pointer/exec.go
index 9d55136..f7fcf8f 100644
--- a/pkg/pointer/exec.go
+++ b/pkg/pointer/exec.go
@@ -8,32 +8,168 @@ import (
 
 func (p *Pointer) Exec(f *field.Field) (done bool, returnValue *int) {
 	c := p.Get(*f)
-	for jumpingMode := false; jumpingMode || c == ' ' || c == ';'; c = p.StepAndGet(*f) {
-		if jumpingMode {
+	if p.stringMode {
+		if p.lastCharWasSpace {
+			for c == ' ' {
+				c = p.StepAndGet(*f)
+			}
+			p.lastCharWasSpace = false
+		}
+		if c == '"' {
+			p.stringMode = false
+			p.lastCharWasSpace = false
+		} else {
+			if c == ' ' {
+				p.lastCharWasSpace = true
+			}
+			p.ss.head.Push(c)
+		}
+	} else {
+		for jumpingMode := false; jumpingMode || c == ' ' || c == ';'; c = p.StepAndGet(*f) {
 			if c == ';' {
-				jumpingMode = false
+				jumpingMode = !jumpingMode
 			}
-			continue
 		}
+		done, returnValue = p.eval(c, f)
 	}
+	p.Step(*f)
+	return
+}
+
+func (p *Pointer) eval(c int, f *field.Field) (done bool, returnValue *int) {
+	handled := true
 	switch c {
 	case '@':
 		return true, nil
 	case '#':
 		p.Step(*f)
 	case 'j':
-		n := p.Ss.Pop()
+		n := p.ss.head.Pop()
 		for j := 0; j < n; j++ {
 			p.Step(*f)
 		}
 	case 'q':
-		v := p.Ss.Pop()
+		v := p.ss.head.Pop()
 		return true, &v
+	case 'k':
+		n := p.ss.head.Pop()
+		c = p.StepAndGet(*f)
+		for jumpingMode := false; jumpingMode || c == ' ' || c == ';'; c = p.StepAndGet(*f) {
+			if c == ';' {
+				jumpingMode = !jumpingMode
+			}
+		}
+		for j := 0; j < n; j++ {
+			p.eval(c, f)
+		}
+	case '!':
+		v := p.ss.head.Pop()
+		if v == 0 {
+			v = 1
+		} else {
+			v = 0
+		}
+		p.ss.head.Push(v)
+	case '`':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		if a > b {
+			a = 1
+		} else {
+			a = 0
+		}
+		p.ss.head.Push(a)
+	case '_':
+		v := p.ss.head.Pop()
+		if v == 0 {
+			p.Redirect('>')
+		} else {
+			p.Redirect('<')
+		}
+	case '|':
+		v := p.ss.head.Pop()
+		if v == 0 {
+			p.Redirect('v')
+		} else {
+			p.Redirect('^')
+		}
+	case 'w':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		if a < b {
+			p.Redirect('[')
+		} else if a > b {
+			p.Redirect(']')
+		}
+	case '+':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		p.ss.head.Push(a + b)
+	case '*':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		p.ss.head.Push(a * b)
+	case '-':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		p.ss.head.Push(a - b)
+	case '/':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		if b == 0 {
+			p.ss.head.Push(0)
+			return
+		}
+		p.ss.head.Push(a / b)
+	case '%':
+		b, a := p.ss.head.Pop(), p.ss.head.Pop()
+		if b == 0 {
+			p.ss.head.Push(0)
+			return
+		}
+		p.ss.head.Push(a % b)
+	case '"':
+		p.stringMode = true
+	case '\'':
+		p.ss.head.Push(p.StepAndGet(*f))
+	case 's':
+		p.Step(*f)
+		f.Set(p.x, p.y, p.ss.head.Pop())
+	case '$':
+		p.ss.head.Pop()
+	case ':':
+		p.ss.head.Duplicate()
+	case '\\':
+		p.ss.head.Swap()
+	case 'n':
+		p.ss.head.Clear()
+	case '{':
+		p.ss.Begin(p)
+	case '}':
+		p.ss.End(p)
+	case 'u':
+		p.ss.Under()
+	case 'g':
+		y, x := p.ss.head.Pop(), p.ss.head.Pop()
+		p.ss.head.Push(f.Get(x+p.sox, y+p.soy))
+	case 'p':
+		y, x, v := p.ss.head.Pop(), p.ss.head.Pop(), p.ss.head.Pop()
+		f.Set(x+p.sox, y+p.soy, v)
+	case '.':
+		p.DecimalOutput(p.ss.head.Pop())
+	case ',':
+		p.CharacterOutput(p.ss.head.Pop())
+	case '&':
+		p.ss.head.Push(p.DecimalInput())
+	case '~':
+		p.ss.head.Push(p.CharacterInput())
 	default:
-		if !p.Redirect(c) {
+		handled = false
+	}
+	if !handled {
+		switch {
+		case p.Redirect(c):
+		case c >= '0' && c <= '9':
+			p.ss.head.Push(c - '0')
+		case c >= 'a' && c <= 'f':
+			p.ss.head.Push(c - 'a' + 10)
+		default:
 			log.Fatalf("Non implemented instruction code %d : %c", c, c)
 		}
 	}
-	p.Step(*f)
 	return
 }
diff --git a/pkg/pointer/intput-output.go b/pkg/pointer/intput-output.go
new file mode 100644
index 0000000..cc7533e
--- /dev/null
+++ b/pkg/pointer/intput-output.go
@@ -0,0 +1,61 @@
+package pointer
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/pkg/term"
+)
+
+var defaultInputLastChar *int = nil
+
+func DefaultCharacterInput() int {
+	if defaultInputLastChar != nil {
+		c := *defaultInputLastChar
+		defaultInputLastChar = nil
+		return c
+	}
+	t, err := term.Open("/dev/stdin")
+	if err != nil {
+		log.Fatalf("Could not open stdin: %+v", err)
+	}
+	defer t.Close()
+	defer t.Restore()
+	term.RawMode(t)
+	b := make([]byte, 1)
+	i, err := os.Stdin.Read(b)
+	if err != nil {
+		log.Fatalf("Error in DefaultCharacterInput { b: %c, i: %d, err: %+v }", b[0], i, err)
+	}
+	return int(b[0])
+}
+
+func DefaultDecimalInput() int {
+	var v int
+	for {
+		c := DefaultCharacterInput()
+		if c >= '0' && c <= '9' {
+			v = c - '0'
+			break
+		}
+	}
+	for {
+		c := DefaultCharacterInput()
+		if c >= '0' && c <= '9' {
+			v = v*10 + c - '0'
+		} else {
+			defaultInputLastChar = &c
+			break
+		}
+	}
+	return v
+}
+
+func DefaultCharacterOutput(c int) {
+	fmt.Printf("%c", c)
+}
+
+func DefaultDecimalOutput(c int) {
+	fmt.Printf("%d ", c)
+}
diff --git a/pkg/pointer/pointer.go b/pkg/pointer/pointer.go
index 902fe69..2eea79d 100644
--- a/pkg/pointer/pointer.go
+++ b/pkg/pointer/pointer.go
@@ -6,6 +6,9 @@ import (
 	"git.adyxax.org/adyxax/gofunge/pkg/field"
 )
 
+type InputFunction func() int
+type OutputFunction func(v int)
+
 type Pointer struct {
 	// the position
 	x int
@@ -16,18 +19,33 @@ type Pointer struct {
 	// The Storage offset
 	sox int
 	soy int
+	// The stringmode flag
+	stringMode       bool
+	lastCharWasSpace bool
 	// The stack
-	Ss *StackStack
+	ss *StackStack
 	// The next element for the multi-"threaded" b98 interpreter
 	Next *Pointer
+	// The input/output functions
+	CharacterInput  InputFunction
+	DecimalInput    InputFunction
+	CharacterOutput OutputFunction
+	DecimalOutput   OutputFunction
 }
 
 func NewPointer() *Pointer {
-	return &Pointer{dx: 1, Ss: NewStackStack()}
+	return &Pointer{
+		dx:              1,
+		ss:              NewStackStack(),
+		CharacterInput:  DefaultCharacterInput,
+		DecimalInput:    DefaultDecimalInput,
+		CharacterOutput: DefaultCharacterOutput,
+		DecimalOutput:   DefaultDecimalOutput,
+	}
 }
 
 func (p Pointer) Split() *Pointer {
-	return &p // p is already a copy
+	return &p // p is already a copy TODO we need to duplicate the stack and handle the Next
 }
 
 func (p *Pointer) Step(f field.Field) {
@@ -76,8 +94,8 @@ func (p *Pointer) Redirect(c int) bool {
 	case 'r':
 		p.Reverse()
 	case 'x':
-		dy := p.Ss.Pop()
-		dx := p.Ss.Pop()
+		dy := p.ss.head.Pop()
+		dx := p.ss.head.Pop()
 		p.RedirectTo(dx, dy)
 	default:
 		return false
diff --git a/pkg/pointer/pointer_test.go b/pkg/pointer/pointer_test.go
index aa007fe..59c09ee 100644
--- a/pkg/pointer/pointer_test.go
+++ b/pkg/pointer/pointer_test.go
@@ -8,10 +8,6 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestNewPointer(t *testing.T) {
-	require.Equal(t, NewPointer(), &Pointer{dx: 1, Ss: NewStackStack()})
-}
-
 func TestSplit(t *testing.T) {
 	file, err := os.Open("../field/test_data/hello.b98")
 	require.NoError(t, err, "Failed to open file")
@@ -23,12 +19,11 @@ func TestSplit(t *testing.T) {
 	// We check that p2 is a real copy
 	p.Step(*f)
 	p2.Step(*f)
-	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, Ss: NewStackStack()}, p)
-	require.Equal(t, &Pointer{x: 1, y: 0, dx: 1, Ss: NewStackStack()}, p2)
+	require.Equal(t, 1, p.x)
+	require.Equal(t, 0, p.y)
 }
 
 func TestStep(t *testing.T) { // Step is thoroughly tested in the field package
-	defaultPointer := NewPointer()
 	// File of one char
 	file, err := os.Open("../field/test_data/minimal.b98")
 	require.NoError(t, err, "Failed to open file")
@@ -37,7 +32,8 @@ func TestStep(t *testing.T) { // Step is thoroughly tested in the field package
 	require.NoError(t, err)
 	p := NewPointer()
 	p.Step(*f)
-	require.Equal(t, defaultPointer, p)
+	require.Equal(t, 0, p.x)
+	require.Equal(t, 0, p.y)
 }
 
 func TestGet(t *testing.T) {
@@ -104,8 +100,8 @@ func TestRedirect(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			p := NewPointer()
 			p.RedirectTo(3, 14)
-			p.Ss.Push(2)
-			p.Ss.Push(7)
+			p.ss.head.Push(2)
+			p.ss.head.Push(7)
 			v := p.Redirect(int(tc.input))
 			require.Equal(t, true, v)
 			require.Equal(t, tc.expectedDx, p.dx, "Invalid dx value")
diff --git a/pkg/pointer/stack-stack.go b/pkg/pointer/stack-stack.go
index 6d22f51..2f57b05 100644
--- a/pkg/pointer/stack-stack.go
+++ b/pkg/pointer/stack-stack.go
@@ -85,11 +85,3 @@ func (ss *StackStack) Under() (reflect bool) {
 	}
 	return false
 }
-
-func (ss StackStack) Pop() int {
-	return ss.head.Pop()
-}
-
-func (ss StackStack) Push(v int) {
-	ss.head.Push(v)
-}
diff --git a/pkg/pointer/stack-stack_test.go b/pkg/pointer/stack-stack_test.go
index fd4c9ea..d5809fd 100644
--- a/pkg/pointer/stack-stack_test.go
+++ b/pkg/pointer/stack-stack_test.go
@@ -248,13 +248,3 @@ func TestUnder(t *testing.T) {
 		require.Equal(t, expected, ss)
 	})
 }
-
-func TestPushPop(t *testing.T) {
-	ss := NewStackStack()
-	ss.Push(12)
-	ss.Push(5)
-	v := ss.Pop()
-	require.Equal(t, 5, v)
-	v = ss.Pop()
-	require.Equal(t, 12, v)
-}