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comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/lib/python3.8/idlelib/history.py @ 68:5028fdace37b

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planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
author jpayne
date Tue, 18 Mar 2025 16:23:26 -0400
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67:0e9998148a16 68:5028fdace37b
1 "Implement Idle Shell history mechanism with History class"
2
3 from idlelib.config import idleConf
4
5
6 class History:
7 ''' Implement Idle Shell history mechanism.
8
9 store - Store source statement (called from pyshell.resetoutput).
10 fetch - Fetch stored statement matching prefix already entered.
11 history_next - Bound to <<history-next>> event (default Alt-N).
12 history_prev - Bound to <<history-prev>> event (default Alt-P).
13 '''
14 def __init__(self, text):
15 '''Initialize data attributes and bind event methods.
16
17 .text - Idle wrapper of tk Text widget, with .bell().
18 .history - source statements, possibly with multiple lines.
19 .prefix - source already entered at prompt; filters history list.
20 .pointer - index into history.
21 .cyclic - wrap around history list (or not).
22 '''
23 self.text = text
24 self.history = []
25 self.prefix = None
26 self.pointer = None
27 self.cyclic = idleConf.GetOption("main", "History", "cyclic", 1, "bool")
28 text.bind("<<history-previous>>", self.history_prev)
29 text.bind("<<history-next>>", self.history_next)
30
31 def history_next(self, event):
32 "Fetch later statement; start with ealiest if cyclic."
33 self.fetch(reverse=False)
34 return "break"
35
36 def history_prev(self, event):
37 "Fetch earlier statement; start with most recent."
38 self.fetch(reverse=True)
39 return "break"
40
41 def fetch(self, reverse):
42 '''Fetch statement and replace current line in text widget.
43
44 Set prefix and pointer as needed for successive fetches.
45 Reset them to None, None when returning to the start line.
46 Sound bell when return to start line or cannot leave a line
47 because cyclic is False.
48 '''
49 nhist = len(self.history)
50 pointer = self.pointer
51 prefix = self.prefix
52 if pointer is not None and prefix is not None:
53 if self.text.compare("insert", "!=", "end-1c") or \
54 self.text.get("iomark", "end-1c") != self.history[pointer]:
55 pointer = prefix = None
56 self.text.mark_set("insert", "end-1c") # != after cursor move
57 if pointer is None or prefix is None:
58 prefix = self.text.get("iomark", "end-1c")
59 if reverse:
60 pointer = nhist # will be decremented
61 else:
62 if self.cyclic:
63 pointer = -1 # will be incremented
64 else: # abort history_next
65 self.text.bell()
66 return
67 nprefix = len(prefix)
68 while 1:
69 pointer += -1 if reverse else 1
70 if pointer < 0 or pointer >= nhist:
71 self.text.bell()
72 if not self.cyclic and pointer < 0: # abort history_prev
73 return
74 else:
75 if self.text.get("iomark", "end-1c") != prefix:
76 self.text.delete("iomark", "end-1c")
77 self.text.insert("iomark", prefix)
78 pointer = prefix = None
79 break
80 item = self.history[pointer]
81 if item[:nprefix] == prefix and len(item) > nprefix:
82 self.text.delete("iomark", "end-1c")
83 self.text.insert("iomark", item)
84 break
85 self.text.see("insert")
86 self.text.tag_remove("sel", "1.0", "end")
87 self.pointer = pointer
88 self.prefix = prefix
89
90 def store(self, source):
91 "Store Shell input statement into history list."
92 source = source.strip()
93 if len(source) > 2:
94 # avoid duplicates
95 try:
96 self.history.remove(source)
97 except ValueError:
98 pass
99 self.history.append(source)
100 self.pointer = None
101 self.prefix = None
102
103
104 if __name__ == "__main__":
105 from unittest import main
106 main('idlelib.idle_test.test_history', verbosity=2, exit=False)