tree.py

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from typing import Iterator, List, Optional, Tuple
 
from ._loop import loop_first, loop_last
from .console import Console, ConsoleOptions, RenderableType, RenderResult
from .jupyter import JupyterMixin
from .measure import Measurement
from .segment import Segment
from .style import Style, StyleStack, StyleType
from .styled import Styled
 
 
class Tree(JupyterMixin):
    """A renderable for a tree structure.
 
    Args:
        label (RenderableType): The renderable or str for the tree label.
        style (StyleType, optional): Style of this tree. Defaults to "tree".
        guide_style (StyleType, optional): Style of the guide lines. Defaults to "tree.line".
        expanded (bool, optional): Also display children. Defaults to True.
        highlight (bool, optional): Highlight renderable (if str). Defaults to False.
    """
 
    def __init__(
        self,
        label: RenderableType,
        *,
        style: StyleType = "tree",
        guide_style: StyleType = "tree.line",
        expanded: bool = True,
        highlight: bool = False,
        hide_root: bool = False,
    ) -> None:
        self.label = label
        self.style = style
        self.guide_style = guide_style
        self.children: List[Tree] = []
        self.expanded = expanded
        self.highlight = highlight
        self.hide_root = hide_root
 
    def add(
        self,
        label: RenderableType,
        *,
        style: Optional[StyleType] = None,
        guide_style: Optional[StyleType] = None,
        expanded: bool = True,
        highlight: Optional[bool] = False,
    ) -> "Tree":
        """Add a child tree.
 
        Args:
            label (RenderableType): The renderable or str for the tree label.
            style (StyleType, optional): Style of this tree. Defaults to "tree".
            guide_style (StyleType, optional): Style of the guide lines. Defaults to "tree.line".
            expanded (bool, optional): Also display children. Defaults to True.
            highlight (Optional[bool], optional): Highlight renderable (if str). Defaults to False.
 
        Returns:
            Tree: A new child Tree, which may be further modified.
        """
        node = Tree(
            label,
            style=self.style if style is None else style,
            guide_style=self.guide_style if guide_style is None else guide_style,
            expanded=expanded,
            highlight=self.highlight if highlight is None else highlight,
        )
        self.children.append(node)
        return node
 
    def __rich_console__(
        self, console: "Console", options: "ConsoleOptions"
    ) -> "RenderResult":
 
        stack: List[Iterator[Tuple[bool, Tree]]] = []
        pop = stack.pop
        push = stack.append
        new_line = Segment.line()
 
        get_style = console.get_style
        null_style = Style.null()
        guide_style = get_style(self.guide_style, default="") or null_style
        SPACE, CONTINUE, FORK, END = range(4)
 
        ASCII_GUIDES = ("    ", "|   ", "+-- ", "`-- ")
        TREE_GUIDES = [
            ("    ", "│   ", "├── ", "└── "),
            ("    ", "┃   ", "┣━━ ", "┗━━ "),
            ("    ", "║   ", "╠══ ", "╚══ "),
        ]
        _Segment = Segment
 
        def make_guide(index: int, style: Style) -> Segment:
            """Make a Segment for a level of the guide lines."""
            if options.ascii_only:
                line = ASCII_GUIDES[index]
            else:
                guide = 1 if style.bold else (2 if style.underline2 else 0)
                line = TREE_GUIDES[0 if options.legacy_windows else guide][index]
            return _Segment(line, style)
 
        levels: List[Segment] = [make_guide(CONTINUE, guide_style)]
        push(iter(loop_last([self])))
 
        guide_style_stack = StyleStack(get_style(self.guide_style))
        style_stack = StyleStack(get_style(self.style))
        remove_guide_styles = Style(bold=False, underline2=False)
 
        depth = 0
 
        while stack:
            stack_node = pop()
            try:
                last, node = next(stack_node)
            except StopIteration:
                levels.pop()
                if levels:
                    guide_style = levels[-1].style or null_style
                    levels[-1] = make_guide(FORK, guide_style)
                    guide_style_stack.pop()
                    style_stack.pop()
                continue
            push(stack_node)
            if last:
                levels[-1] = make_guide(END, levels[-1].style or null_style)
 
            guide_style = guide_style_stack.current + get_style(node.guide_style)
            style = style_stack.current + get_style(node.style)
            prefix = levels[(2 if self.hide_root else 1) :]
            renderable_lines = console.render_lines(
                Styled(node.label, style),
                options.update(
                    width=options.max_width
                    - sum(level.cell_length for level in prefix),
                    highlight=self.highlight,
                    height=None,
                ),
                pad=options.justify is not None,
            )
 
            if not (depth == 0 and self.hide_root):
                for first, line in loop_first(renderable_lines):
                    if prefix:
                        yield from _Segment.apply_style(
                            prefix,
                            style.background_style,
                            post_style=remove_guide_styles,
                        )
                    yield from line
                    yield new_line
                    if first and prefix:
                        prefix[-1] = make_guide(
                            SPACE if last else CONTINUE, prefix[-1].style or null_style
                        )
 
            if node.expanded and node.children:
                levels[-1] = make_guide(
                    SPACE if last else CONTINUE, levels[-1].style or null_style
                )
                levels.append(
                    make_guide(END if len(node.children) == 1 else FORK, guide_style)
                )
                style_stack.push(get_style(node.style))
                guide_style_stack.push(get_style(node.guide_style))
                push(iter(loop_last(node.children)))
                depth += 1
 
    def __rich_measure__(
        self, console: "Console", options: "ConsoleOptions"
    ) -> "Measurement":
        stack: List[Iterator[Tree]] = [iter([self])]
        pop = stack.pop
        push = stack.append
        minimum = 0
        maximum = 0
        measure = Measurement.get
        level = 0
        while stack:
            iter_tree = pop()
            try:
                tree = next(iter_tree)
            except StopIteration:
                level -= 1
                continue
            push(iter_tree)
            min_measure, max_measure = measure(console, options, tree.label)
            indent = level * 4
            minimum = max(min_measure + indent, minimum)
            maximum = max(max_measure + indent, maximum)
            if tree.expanded and tree.children:
                push(iter(tree.children))
                level += 1
        return Measurement(minimum, maximum)
 
 
if __name__ == "__main__":  # pragma: no cover
 
    from pip._vendor.rich.console import Group
    from pip._vendor.rich.markdown import Markdown
    from pip._vendor.rich.panel import Panel
    from pip._vendor.rich.syntax import Syntax
    from pip._vendor.rich.table import Table
 
    table = Table(row_styles=["", "dim"])
 
    table.add_column("Released", style="cyan", no_wrap=True)
    table.add_column("Title", style="magenta")
    table.add_column("Box Office", justify="right", style="green")
 
    table.add_row("Dec 20, 2019", "Star Wars: The Rise of Skywalker", "$952,110,690")
    table.add_row("May 25, 2018", "Solo: A Star Wars Story", "$393,151,347")
    table.add_row("Dec 15, 2017", "Star Wars Ep. V111: The Last Jedi", "$1,332,539,889")
    table.add_row("Dec 16, 2016", "Rogue One: A Star Wars Story", "$1,332,439,889")
 
    code = """\
class Segment(NamedTuple):
    text: str = ""
    style: Optional[Style] = None
    is_control: bool = False
"""
    syntax = Syntax(code, "python", theme="monokai", line_numbers=True)
 
    markdown = Markdown(
        """\
### example.md
> Hello, World!
>
> Markdown _all_ the things
"""
    )
 
    root = Tree("🌲 [b green]Rich Tree", highlight=True, hide_root=True)
 
    node = root.add(":file_folder: Renderables", guide_style="red")
    simple_node = node.add(":file_folder: [bold yellow]Atomic", guide_style="uu green")
    simple_node.add(Group("📄 Syntax", syntax))
    simple_node.add(Group("📄 Markdown", Panel(markdown, border_style="green")))
 
    containers_node = node.add(
        ":file_folder: [bold magenta]Containers", guide_style="bold magenta"
    )
    containers_node.expanded = True
    panel = Panel.fit("Just a panel", border_style="red")
    containers_node.add(Group("📄 Panels", panel))
 
    containers_node.add(Group("📄 [b magenta]Table", table))
 
    console = Console()
 
    console.print(root)