/usr/lib/python2.7/idlelib/CodeContext.py is in idle-python2.7 2.7.3-0ubuntu3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | """CodeContext - Extension to display the block context above the edit window
Once code has scrolled off the top of a window, it can be difficult to
determine which block you are in. This extension implements a pane at the top
of each IDLE edit window which provides block structure hints. These hints are
the lines which contain the block opening keywords, e.g. 'if', for the
enclosing block. The number of hint lines is determined by the numlines
variable in the CodeContext section of config-extensions.def. Lines which do
not open blocks are not shown in the context hints pane.
"""
import Tkinter
from Tkconstants import TOP, LEFT, X, W, SUNKEN
import re
from sys import maxint as INFINITY
from idlelib.configHandler import idleConf
BLOCKOPENERS = set(["class", "def", "elif", "else", "except", "finally", "for",
"if", "try", "while", "with"])
UPDATEINTERVAL = 100 # millisec
FONTUPDATEINTERVAL = 1000 # millisec
getspacesfirstword =\
lambda s, c=re.compile(r"^(\s*)(\w*)"): c.match(s).groups()
class CodeContext:
menudefs = [('options', [('!Code Conte_xt', '<<toggle-code-context>>')])]
context_depth = idleConf.GetOption("extensions", "CodeContext",
"numlines", type="int", default=3)
bgcolor = idleConf.GetOption("extensions", "CodeContext",
"bgcolor", type="str", default="LightGray")
fgcolor = idleConf.GetOption("extensions", "CodeContext",
"fgcolor", type="str", default="Black")
def __init__(self, editwin):
self.editwin = editwin
self.text = editwin.text
self.textfont = self.text["font"]
self.label = None
# self.info is a list of (line number, indent level, line text, block
# keyword) tuples providing the block structure associated with
# self.topvisible (the linenumber of the line displayed at the top of
# the edit window). self.info[0] is initialized as a 'dummy' line which
# starts the toplevel 'block' of the module.
self.info = [(0, -1, "", False)]
self.topvisible = 1
visible = idleConf.GetOption("extensions", "CodeContext",
"visible", type="bool", default=False)
if visible:
self.toggle_code_context_event()
self.editwin.setvar('<<toggle-code-context>>', True)
# Start two update cycles, one for context lines, one for font changes.
self.text.after(UPDATEINTERVAL, self.timer_event)
self.text.after(FONTUPDATEINTERVAL, self.font_timer_event)
def toggle_code_context_event(self, event=None):
if not self.label:
# Calculate the border width and horizontal padding required to
# align the context with the text in the main Text widget.
#
# All values are passed through int(str(<value>)), since some
# values may be pixel objects, which can't simply be added to ints.
widgets = self.editwin.text, self.editwin.text_frame
# Calculate the required vertical padding
padx = 0
for widget in widgets:
padx += int(str( widget.pack_info()['padx'] ))
padx += int(str( widget.cget('padx') ))
# Calculate the required border width
border = 0
for widget in widgets:
border += int(str( widget.cget('border') ))
self.label = Tkinter.Label(self.editwin.top,
text="\n" * (self.context_depth - 1),
anchor=W, justify=LEFT,
font=self.textfont,
bg=self.bgcolor, fg=self.fgcolor,
width=1, #don't request more than we get
padx=padx, border=border,
relief=SUNKEN)
# Pack the label widget before and above the text_frame widget,
# thus ensuring that it will appear directly above text_frame
self.label.pack(side=TOP, fill=X, expand=False,
before=self.editwin.text_frame)
else:
self.label.destroy()
self.label = None
idleConf.SetOption("extensions", "CodeContext", "visible",
str(self.label is not None))
idleConf.SaveUserCfgFiles()
def get_line_info(self, linenum):
"""Get the line indent value, text, and any block start keyword
If the line does not start a block, the keyword value is False.
The indentation of empty lines (or comment lines) is INFINITY.
"""
text = self.text.get("%d.0" % linenum, "%d.end" % linenum)
spaces, firstword = getspacesfirstword(text)
opener = firstword in BLOCKOPENERS and firstword
if len(text) == len(spaces) or text[len(spaces)] == '#':
indent = INFINITY
else:
indent = len(spaces)
return indent, text, opener
def get_context(self, new_topvisible, stopline=1, stopindent=0):
"""Get context lines, starting at new_topvisible and working backwards.
Stop when stopline or stopindent is reached. Return a tuple of context
data and the indent level at the top of the region inspected.
"""
assert stopline > 0
lines = []
# The indentation level we are currently in:
lastindent = INFINITY
# For a line to be interesting, it must begin with a block opening
# keyword, and have less indentation than lastindent.
for linenum in xrange(new_topvisible, stopline-1, -1):
indent, text, opener = self.get_line_info(linenum)
if indent < lastindent:
lastindent = indent
if opener in ("else", "elif"):
# We also show the if statement
lastindent += 1
if opener and linenum < new_topvisible and indent >= stopindent:
lines.append((linenum, indent, text, opener))
if lastindent <= stopindent:
break
lines.reverse()
return lines, lastindent
def update_code_context(self):
"""Update context information and lines visible in the context pane.
"""
new_topvisible = int(self.text.index("@0,0").split('.')[0])
if self.topvisible == new_topvisible: # haven't scrolled
return
if self.topvisible < new_topvisible: # scroll down
lines, lastindent = self.get_context(new_topvisible,
self.topvisible)
# retain only context info applicable to the region
# between topvisible and new_topvisible:
while self.info[-1][1] >= lastindent:
del self.info[-1]
elif self.topvisible > new_topvisible: # scroll up
stopindent = self.info[-1][1] + 1
# retain only context info associated
# with lines above new_topvisible:
while self.info[-1][0] >= new_topvisible:
stopindent = self.info[-1][1]
del self.info[-1]
lines, lastindent = self.get_context(new_topvisible,
self.info[-1][0]+1,
stopindent)
self.info.extend(lines)
self.topvisible = new_topvisible
# empty lines in context pane:
context_strings = [""] * max(0, self.context_depth - len(self.info))
# followed by the context hint lines:
context_strings += [x[2] for x in self.info[-self.context_depth:]]
self.label["text"] = '\n'.join(context_strings)
def timer_event(self):
if self.label:
self.update_code_context()
self.text.after(UPDATEINTERVAL, self.timer_event)
def font_timer_event(self):
newtextfont = self.text["font"]
if self.label and newtextfont != self.textfont:
self.textfont = newtextfont
self.label["font"] = self.textfont
self.text.after(FONTUPDATEINTERVAL, self.font_timer_event)
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