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package ansi
import (
"bytes"
)
// BlockStack is a stack of block elements, used to calculate the current
// indentation & margin level during the rendering process.
type BlockStack []BlockElement
// Len returns the length of the stack.
func (s *BlockStack) Len() int {
return len(*s)
}
// Push appends an item to the stack.
func (s *BlockStack) Push(e BlockElement) {
*s = append(*s, e)
}
// Pop removes the last item on the stack.
func (s *BlockStack) Pop() {
stack := *s
if len(stack) == 0 {
return
}
stack = stack[0 : len(stack)-1]
*s = stack
}
// Indent returns the current indentation level of all elements in the stack.
func (s BlockStack) Indent() uint {
var i uint
for _, v := range s {
if v.Style.Indent == nil {
continue
}
i += *v.Style.Indent
}
return i
}
// Margin returns the current margin level of all elements in the stack.
func (s BlockStack) Margin() uint {
var i uint
for _, v := range s {
if v.Style.Margin == nil {
continue
}
i += *v.Style.Margin
}
return i
}
// Width returns the available rendering width.
func (s BlockStack) Width(ctx RenderContext) uint {
if s.Indent()*s.Margin() > uint(ctx.options.WordWrap) {
return 0
}
return uint(ctx.options.WordWrap) - s.Indent()*s.Margin()
}
// Parent returns the current BlockElement's parent.
func (s BlockStack) Parent() BlockElement {
if len(s) == 1 {
return BlockElement{
Block: &bytes.Buffer{},
}
}
return s[len(s)-2]
}
// Current returns the current BlockElement.
func (s BlockStack) Current() BlockElement {
if len(s) == 0 {
return BlockElement{
Block: &bytes.Buffer{},
}
}
return s[len(s)-1]
}
// With returns a StylePrimitive that inherits the current BlockElement's style.
func (s BlockStack) With(child StylePrimitive) StylePrimitive {
sb := StyleBlock{}
sb.StylePrimitive = child
return cascadeStyle(s.Current().Style, sb, false).StylePrimitive
}
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