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1 """Buffer class."""
2
3 __author__ = "Patrick K. O'Brien <pobrien@orbtech.com>"
4 __cvsid__ = "$Id$"
5 __revision__ = "$Revision$"[11:-2]
6
7 from interpreter import Interpreter
8 import imp
9 import os
10 import sys
11
12 import document
13
14
15 class Buffer:
16 """Buffer class."""
17
18 id = 0
19
20 def __init__(self, filename=None):
21 """Create a Buffer instance."""
22 Buffer.id += 1
23 self.id = Buffer.id
24 self.interp = Interpreter(locals={})
25 self.name = ''
26 self.editors = {}
27 self.editor = None
28 self.modules = sys.modules.keys()
29 self.syspath = sys.path[:]
30 while True:
31 try:
32 self.syspath.remove('')
33 except ValueError:
34 break
35 while True:
36 try:
37 self.syspath.remove('.')
38 except ValueError:
39 break
40 self.open(filename)
41
42 def addEditor(self, editor):
43 """Add an editor."""
44 self.editor = editor
45 self.editors[editor.id] = editor
46
47 def hasChanged(self):
48 """Return True if text in editor has changed since last save."""
49 if self.editor:
50 return self.editor.hasChanged()
51 else:
52 return False
53
54 def new(self, filepath):
55 """New empty buffer."""
56 if not filepath:
57 return
58 if os.path.exists(filepath):
59 self.confirmed = self.overwriteConfirm(filepath)
60 else:
61 self.confirmed = True
62
63 def open(self, filename):
64 """Open file into buffer."""
65 self.doc = document.Document(filename)
66 self.name = self.doc.filename or ('Untitled:' + str(self.id))
67 self.modulename = self.doc.filebase
68 # XXX This should really make sure filedir is first item in syspath.
69 # XXX Or maybe this should be moved to the update namespace method.
70 if self.doc.filedir and self.doc.filedir not in self.syspath:
71 # To create the proper context for updateNamespace.
72 self.syspath.insert(0, self.doc.filedir)
73 if self.doc.filepath and os.path.exists(self.doc.filepath):
74 self.confirmed = True
75 if self.editor:
76 text = self.doc.read()
77 self.editor._setBuffer(buffer=self, text=text)
78
79 def overwriteConfirm(filepath):
80 """Confirm overwriting an existing file."""
81 return False
82
83 def save(self):
84 """Save buffer."""
85 filepath = self.doc.filepath
86 if not filepath:
87 return # XXX Get filename
88 if not os.path.exists(filepath):
89 self.confirmed = True
90 if not self.confirmed:
91 self.confirmed = self.overwriteConfirm(filepath)
92 if self.confirmed:
93 self.doc.write(self.editor.getText())
94 if self.editor:
95 self.editor.setSavePoint()
96
97 def saveAs(self, filename):
98 """Save buffer."""
99 self.doc = document.Document(filename)
100 self.name = self.doc.filename
101 self.modulename = self.doc.filebase
102 self.save()
103
104 def updateNamespace(self):
105 """Update the namespace for autocompletion and calltips.
106
107 Return True if updated, False if there was an error."""
108 if not self.interp or not hasattr(self.editor, 'getText'):
109 return False
110 syspath = sys.path
111 sys.path = self.syspath
112 text = self.editor.getText()
113 text = text.replace('\r\n', '\n')
114 text = text.replace('\r', '\n')
115 name = self.modulename or self.name
116 module = imp.new_module(name)
117 newspace = module.__dict__.copy()
118 try:
119 try:
120 code = compile(text, name, 'exec')
121 except:
122 raise
123 # return False
124 try:
125 exec code in newspace
126 except:
127 raise
128 # return False
129 else:
130 # No problems, so update the namespace.
131 self.interp.locals.clear()
132 self.interp.locals.update(newspace)
133 return True
134 finally:
135 sys.path = syspath
136 for m in sys.modules.keys():
137 if m not in self.modules:
138 del sys.modules[m]