Lib/idlelib/browser.py

"""Module browser.

XXX TO DO:

- reparse when source changed (maybe just a button would be OK?)
    (or recheck on window popup)
- add popup menu with more options (e.g. doc strings, base classes, imports)
- show function argument list? (have to do pattern matching on source)
- should the classes and methods lists also be in the module's menu bar?
- add base classes to class browser tree
"""

import os
import pyclbr
import sys

from idlelib.config import idleConf
from idlelib import pyshell
from idlelib.tree import TreeNode, TreeItem, ScrolledCanvas
from idlelib.windows import ListedToplevel


file_open = None  # Method...Item and Class...Item use this.
# Normally pyshell.flist.open, but there is no pyshell.flist for htest.


def transform_children(child_dict, modname=None):
    """Transform a child dictionary to an ordered sequence of objects.

    The dictionary maps names to pyclbr information objects.
    Filter out imported objects.
    Augment class names with bases.
    Sort objects by line number.

    The current tree only calls this once per child_dic as it saves
    TreeItems once created.  A future tree and tests might violate this,
    so a check prevents multiple in-place augmentations.
    """
    obs = []  # Use list since values should already be sorted.
    for key, obj in child_dict.items():
        if modname is None or obj.module == modname:
            if hasattr(obj, 'super') and obj.super and obj.name == key:
                # If obj.name != key, it has already been suffixed.
                supers = []
                for sup in obj.super:
                    if type(sup) is type(''):
                        sname = sup
                    else:
                        sname = sup.name
                        if sup.module != obj.module:
                            sname = f'{sup.module}.{sname}'
                    supers.append(sname)
                obj.name += '({})'.format(', '.join(supers))
            obs.append(obj)
    return sorted(obs, key=lambda o: o.lineno)


class ModuleBrowser:
    """Browse module classes and functions in IDLE.
    """
    # This class is the base class for pathbrowser.PathBrowser.
    # Init and close are inherited, other methods are overriden.

    def __init__(self, flist, name, path, _htest=False, _utest=False):
        # XXX This API should change, if the file doesn't end in ".py"
        # XXX the code here is bogus!
        """Create a window for browsing a module's structure.

        Args:
            flist: filelist.FileList instance used as the root for the window.
            name: Python module to parse.
            path: Module search path.
            _htest - bool, change box when location running htest.

        Global variables:
            file_open: Function used for opening a file.

        Instance variables:
            name: Module name.
            file: Full path and module with .py extension.  Used in
                creating ModuleBrowserTreeItem as the rootnode for
                the tree and subsequently in the children.
        """
        global file_open
        if not (_htest or _utest):
            file_open = pyshell.flist.open
        self.name = name
        self.file = os.path.join(path[0], self.name + ".py")
        self._htest = _htest
        self._utest = _utest
        self.init(flist)

    def close(self, event=None):
        "Dismiss the window and the tree nodes."
        self.top.destroy()
        self.node.destroy()

    def init(self, flist):
        "Create browser tkinter widgets, including the tree."
        self.flist = flist
        # reset pyclbr
        pyclbr._modules.clear()
        # create top
        self.top = top = ListedToplevel(flist.root)
        top.protocol("WM_DELETE_WINDOW", self.close)
        top.bind("<Escape>", self.close)
        if self._htest: # place dialog below parent if running htest
            top.geometry("+%d+%d" %
                (flist.root.winfo_rootx(), flist.root.winfo_rooty() + 200))
        self.settitle()
        top.focus_set()
        # create scrolled canvas
        theme = idleConf.CurrentTheme()
        background = idleConf.GetHighlight(theme, 'normal')['background']
        sc = ScrolledCanvas(top, bg=background, highlightthickness=0, takefocus=1)
        sc.frame.pack(expand=1, fill="both")
        item = self.rootnode()
        self.node = node = TreeNode(sc.canvas, None, item)
        if not self._utest:
            node.update()
            node.expand()

    def settitle(self):
        "Set the window title."
        self.top.wm_title("Module Browser - " + self.name)
        self.top.wm_iconname("Module Browser")

    def rootnode(self):
        "Return a ModuleBrowserTreeItem as the root of the tree."
        return ModuleBrowserTreeItem(self.file)


class ModuleBrowserTreeItem(TreeItem):
    """Browser tree for Python module.

    Uses TreeItem as the basis for the structure of the tree.
    """

    def __init__(self, file):
        """Create a TreeItem for the file.

        Args:
            file: Full path and module name.
        """
        self.file = file

    def GetText(self):
        "Return the module name as the text string to display."
        return os.path.basename(self.file)

    def GetIconName(self):
        "Return the name of the icon to display."
        return "python"

    def GetSubList(self):
        "Return ChildBrowserTreeItems for children."
        return [ChildBrowserTreeItem(obj) for obj in self.listchildren()]

    def OnDoubleClick(self):
        "Open a module in an editor window when double clicked."
        if os.path.normcase(self.file[-3:]) != ".py":
            return
        if not os.path.exists(self.file):
            return
        file_open(self.file)

    def IsExpandable(self):
        "Return True if Python (.py) file."
        return os.path.normcase(self.file[-3:]) == ".py"

    def listchildren(self):
        "Return sequenced classes and functions in the module."
        dir, file = os.path.split(self.file)
        name, ext = os.path.splitext(file)
        if os.path.normcase(ext) != ".py":
            return []
        try:
            tree = pyclbr.readmodule_ex(name, [dir] + sys.path)
        except ImportError:
            return []
        return transform_children(tree, name)


class ChildBrowserTreeItem(TreeItem):
    """Browser tree for child nodes within the module.

    Uses TreeItem as the basis for the structure of the tree.
    """

    def __init__(self, obj):
        "Create a TreeItem for a pyclbr class/function object."
        self.obj = obj
        self.name = obj.name
        self.isfunction = isinstance(obj, pyclbr.Function)

    def GetText(self):
        "Return the name of the function/class to display."
        name = self.name
        if self.isfunction:
            return "def " + name + "(...)"
        else:
            return "class " + name

    def GetIconName(self):
        "Return the name of the icon to display."
        if self.isfunction:
            return "python"
        else:
            return "folder"

    def IsExpandable(self):
        "Return True if self.obj has nested objects."
        return self.obj.children != {}

    def GetSubList(self):
        "Return ChildBrowserTreeItems for children."
        return [ChildBrowserTreeItem(obj)
                for obj in transform_children(self.obj.children)]

    def OnDoubleClick(self):
        "Open module with file_open and position to lineno."
        try:
            edit = file_open(self.obj.file)
            edit.gotoline(self.obj.lineno)
        except (OSError, AttributeError):
            pass


def _module_browser(parent): # htest #
    try:
        file = sys.argv[1]  # If pass file on command line
        # If this succeeds, unittest will fail.
    except IndexError:
        file = __file__
        # Add objects for htest
        class Nested_in_func(TreeNode):
            def nested_in_class(): pass
        def closure():
            class Nested_in_closure: pass
    dir, file = os.path.split(file)
    name = os.path.splitext(file)[0]
    flist = pyshell.PyShellFileList(parent)
    global file_open
    file_open = flist.open
    ModuleBrowser(flist, name, [dir], _htest=True)

if __name__ == "__main__":
    from unittest import main
    main('idlelib.idle_test.test_browser', verbosity=2, exit=False)
    from idlelib.idle_test.htest import run
    run(_module_browser)