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import codecs
import re
import string
import win32con
import win32ui
from pywin import default_scintilla_encoding
from pywin.mfc import docview
from . import scintillacon
crlf_bytes = "\r\n".encode("ascii")
lf_bytes = "\n".encode("ascii")
# re from pep263 - but we use it both on bytes and strings.
re_encoding_bytes = re.compile("coding[:=]\s*([-\w.]+)".encode("ascii"))
re_encoding_text = re.compile("coding[:=]\s*([-\w.]+)")
ParentScintillaDocument = docview.Document
class CScintillaDocument(ParentScintillaDocument):
"A SyntEdit document."
def __init__(self, *args):
self.bom = None # the BOM, if any, read from the file.
# the encoding we detected from the source. Might have
# detected via the BOM or an encoding decl. Note that in
# the latter case (ie, while self.bom is None), it can't be
# trusted - the user may have edited the encoding decl between
# open and save.
self.source_encoding = None
ParentScintillaDocument.__init__(self, *args)
def DeleteContents(self):
pass
def OnOpenDocument(self, filename):
# init data members
# print "Opening", filename
self.SetPathName(filename) # Must set this early!
try:
# load the text as binary we can get smart
# about detecting any existing EOL conventions.
f = open(filename, "rb")
try:
self._LoadTextFromFile(f)
finally:
f.close()
except IOError:
rc = win32ui.MessageBox(
"Could not load the file from %s\n\nDo you want to create a new file?"
% filename,
"Pythonwin",
win32con.MB_YESNO | win32con.MB_ICONWARNING,
)
if rc == win32con.IDNO:
return 0
assert rc == win32con.IDYES, rc
try:
f = open(filename, "wb+")
try:
self._LoadTextFromFile(f)
finally:
f.close()
except IOError as e:
rc = win32ui.MessageBox("Cannot create the file %s" % filename)
return 1
def SaveFile(self, fileName, encoding=None):
view = self.GetFirstView()
ok = view.SaveTextFile(fileName, encoding=encoding)
if ok:
view.SCISetSavePoint()
return ok
def ApplyFormattingStyles(self):
self._ApplyOptionalToViews("ApplyFormattingStyles")
# #####################
# File related functions
# Helper to transfer text from the MFC document to the control.
def _LoadTextFromFile(self, f):
# detect EOL mode - we don't support \r only - so find the
# first '\n' and guess based on the char before.
l = f.readline()
l2 = f.readline()
# If line ends with \r\n or has no line ending, use CRLF.
if l.endswith(crlf_bytes) or not l.endswith(lf_bytes):
eol_mode = scintillacon.SC_EOL_CRLF
else:
eol_mode = scintillacon.SC_EOL_LF
# Detect the encoding - first look for a BOM, and if not found,
# look for a pep263 encoding declaration.
for bom, encoding in (
(codecs.BOM_UTF8, "utf8"),
(codecs.BOM_UTF16_LE, "utf_16_le"),
(codecs.BOM_UTF16_BE, "utf_16_be"),
):
if l.startswith(bom):
self.bom = bom
self.source_encoding = encoding
l = l[len(bom) :] # remove it.
break
else:
# no bom detected - look for pep263 encoding decl.
for look in (l, l2):
# Note we are looking at raw bytes here: so
# both the re itself uses bytes and the result
# is bytes - but we need the result as a string.
match = re_encoding_bytes.search(look)
if match is not None:
self.source_encoding = match.group(1).decode("ascii")
break
# reading by lines would be too slow? Maybe we can use the
# incremental encoders? For now just stick with loading the
# entire file in memory.
text = l + l2 + f.read()
# Translate from source encoding to UTF-8 bytes for Scintilla
source_encoding = self.source_encoding
# If we don't know an encoding, try utf-8 - if that fails we will
# fallback to latin-1 to treat it as bytes...
if source_encoding is None:
source_encoding = "utf-8"
# we could optimize this by avoiding utf8 to-ing and from-ing,
# but then we would lose the ability to handle invalid utf8
# (and even then, the use of encoding aliases makes this tricky)
# To create an invalid utf8 file:
# >>> open(filename, "wb").write(codecs.BOM_UTF8+"bad \xa9har\r\n")
try:
dec = text.decode(source_encoding)
except UnicodeError:
print(
"WARNING: Failed to decode bytes from '%s' encoding - treating as latin1"
% source_encoding
)
dec = text.decode("latin1")
except LookupError:
print(
"WARNING: Invalid encoding '%s' specified - treating as latin1"
% source_encoding
)
dec = text.decode("latin1")
# and put it back as utf8 - this shouldn't fail.
text = dec.encode(default_scintilla_encoding)
view = self.GetFirstView()
if view.IsWindow():
# Turn off undo collection while loading
view.SendScintilla(scintillacon.SCI_SETUNDOCOLLECTION, 0, 0)
# Make sure the control isnt read-only
view.SetReadOnly(0)
view.SendScintilla(scintillacon.SCI_CLEARALL)
view.SendMessage(scintillacon.SCI_ADDTEXT, text)
view.SendScintilla(scintillacon.SCI_SETUNDOCOLLECTION, 1, 0)
view.SendScintilla(win32con.EM_EMPTYUNDOBUFFER, 0, 0)
# set EOL mode
view.SendScintilla(scintillacon.SCI_SETEOLMODE, eol_mode)
def _SaveTextToFile(self, view, filename, encoding=None):
s = view.GetTextRange() # already decoded from scintilla's encoding
source_encoding = encoding
if source_encoding is None:
if self.bom:
source_encoding = self.source_encoding
else:
# no BOM - look for an encoding.
bits = re.split("[\r\n]+", s, 3)
for look in bits[:-1]:
match = re_encoding_text.search(look)
if match is not None:
source_encoding = match.group(1)
self.source_encoding = source_encoding
break
if source_encoding is None:
source_encoding = "utf-8"
## encode data before opening file so script is not lost if encoding fails
file_contents = s.encode(source_encoding)
# Open in binary mode as scintilla itself ensures the
# line endings are already appropriate
f = open(filename, "wb")
try:
if self.bom:
f.write(self.bom)
f.write(file_contents)
finally:
f.close()
self.SetModifiedFlag(0)
def FinalizeViewCreation(self, view):
pass
def HookViewNotifications(self, view):
parent = view.GetParentFrame()
parent.HookNotify(
ViewNotifyDelegate(self, "OnBraceMatch"), scintillacon.SCN_CHECKBRACE
)
parent.HookNotify(
ViewNotifyDelegate(self, "OnMarginClick"), scintillacon.SCN_MARGINCLICK
)
parent.HookNotify(
ViewNotifyDelegate(self, "OnNeedShown"), scintillacon.SCN_NEEDSHOWN
)
parent.HookNotify(
DocumentNotifyDelegate(self, "OnSavePointReached"),
scintillacon.SCN_SAVEPOINTREACHED,
)
parent.HookNotify(
DocumentNotifyDelegate(self, "OnSavePointLeft"),
scintillacon.SCN_SAVEPOINTLEFT,
)
parent.HookNotify(
DocumentNotifyDelegate(self, "OnModifyAttemptRO"),
scintillacon.SCN_MODIFYATTEMPTRO,
)
# Tell scintilla what characters should abort auto-complete.
view.SCIAutoCStops(string.whitespace + "()[]:;+-/*=\\?'!#@$%^&,<>\"'|")
if view != self.GetFirstView():
view.SCISetDocPointer(self.GetFirstView().SCIGetDocPointer())
def OnSavePointReached(self, std, extra):
self.SetModifiedFlag(0)
def OnSavePointLeft(self, std, extra):
self.SetModifiedFlag(1)
def OnModifyAttemptRO(self, std, extra):
self.MakeDocumentWritable()
# All Marker functions are 1 based.
def MarkerAdd(self, lineNo, marker):
self.GetEditorView().SCIMarkerAdd(lineNo - 1, marker)
def MarkerCheck(self, lineNo, marker):
v = self.GetEditorView()
lineNo = lineNo - 1 # Make 0 based
markerState = v.SCIMarkerGet(lineNo)
return markerState & (1 << marker) != 0
def MarkerToggle(self, lineNo, marker):
v = self.GetEditorView()
if self.MarkerCheck(lineNo, marker):
v.SCIMarkerDelete(lineNo - 1, marker)
else:
v.SCIMarkerAdd(lineNo - 1, marker)
def MarkerDelete(self, lineNo, marker):
self.GetEditorView().SCIMarkerDelete(lineNo - 1, marker)
def MarkerDeleteAll(self, marker):
self.GetEditorView().SCIMarkerDeleteAll(marker)
def MarkerGetNext(self, lineNo, marker):
return self.GetEditorView().SCIMarkerNext(lineNo - 1, 1 << marker) + 1
def MarkerAtLine(self, lineNo, marker):
markerState = self.GetEditorView().SCIMarkerGet(lineNo - 1)
return markerState & (1 << marker)
# Helper for reflecting functions to views.
def _ApplyToViews(self, funcName, *args):
for view in self.GetAllViews():
func = getattr(view, funcName)
func(*args)
def _ApplyOptionalToViews(self, funcName, *args):
for view in self.GetAllViews():
func = getattr(view, funcName, None)
if func is not None:
func(*args)
def GetEditorView(self):
# Find the first frame with a view,
# then ask it to give the editor view
# as it knows which one is "active"
try:
frame_gev = self.GetFirstView().GetParentFrame().GetEditorView
except AttributeError:
return self.GetFirstView()
return frame_gev()
# Delegate to the correct view, based on the control that sent it.
class ViewNotifyDelegate:
def __init__(self, doc, name):
self.doc = doc
self.name = name
def __call__(self, std, extra):
(hwndFrom, idFrom, code) = std
for v in self.doc.GetAllViews():
if v.GetSafeHwnd() == hwndFrom:
return getattr(v, self.name)(*(std, extra))
# Delegate to the document, but only from a single view (as each view sends it seperately)
class DocumentNotifyDelegate:
def __init__(self, doc, name):
self.doc = doc
self.delegate = getattr(doc, name)
def __call__(self, std, extra):
(hwndFrom, idFrom, code) = std
if hwndFrom == self.doc.GetEditorView().GetSafeHwnd():
self.delegate(*(std, extra))