fix wrong git ignore

internal/pdf/ps/stack.go

@@ -0,0 +1,83 @@
+package ps
+
+type PSStack []PSObject
+
+func NewPSStack() *PSStack {
+	return &PSStack{}
+}
+
+func (stack *PSStack) Empty() {
+	*stack = []PSObject{}
+}
+
+func (stack *PSStack) Push(obj PSObject) error {
+	if len(*stack) > 100 {
+		return ErrStackOverflow
+	}
+
+	*stack = append(*stack, obj)
+	return nil
+}
+
+func (stack *PSStack) Pop() (PSObject, error) {
+	if len(*stack) < 1 {
+		return nil, ErrStackUnderflow
+	}
+
+	obj := (*stack)[len(*stack)-1]
+	*stack = (*stack)[0 : len(*stack)-1]
+
+	return obj, nil
+}
+
+func (stack *PSStack) PopInteger() (int, error) {
+	obj, err := stack.Pop()
+	if err != nil {
+		return 0, err
+	}
+
+	if number, is := obj.(*PSInteger); is {
+		return number.Val, nil
+	} else {
+		return 0, ErrTypeCheck
+	}
+}
+
+// Pop and return the numeric value of the top of the stack as a float64.
+// Real or integer only.
+func (stack *PSStack) PopNumberAsFloat64() (float64, error) {
+	obj, err := stack.Pop()
+	if err != nil {
+		return 0, err
+	}
+
+	if number, is := obj.(*PSReal); is {
+		return number.Val, nil
+	} else if number, is := obj.(*PSInteger); is {
+		return float64(number.Val), nil
+	} else {
+		return 0, ErrTypeCheck
+	}
+}
+
+func (this *PSStack) String() string {
+	s := "[ "
+	for _, obj := range *this {
+		s += obj.String()
+		s += " "
+	}
+	s += "]"
+
+	return s
+}
+
+func (this *PSStack) DebugString() string {
+	s := "[ "
+	for _, obj := range *this {
+		s += obj.DebugString()
+		s += " "
+	}
+	s += "]"
+
+	return s
+}