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searchengine.py
'''Define SearchEngine for search dialogs.''' import re from tkinter import StringVar, BooleanVar, TclError import tkinter.messagebox as tkMessageBox def get(root): '''Return the singleton SearchEngine instance for the process. The single SearchEngine saves settings between dialog instances. If there is not a SearchEngine already, make one. ''' if not hasattr(root, "_searchengine"): root._searchengine = SearchEngine(root) # This creates a cycle that persists until root is deleted. return root._searchengine class SearchEngine: """Handles searching a text widget for Find, Replace, and Grep.""" def __init__(self, root): '''Initialize Variables that save search state. The dialogs bind these to the UI elements present in the dialogs. ''' self.root = root # need for report_error() self.patvar = StringVar(root, '') # search pattern self.revar = BooleanVar(root, False) # regular expression? self.casevar = BooleanVar(root, False) # match case? self.wordvar = BooleanVar(root, False) # match whole word? self.wrapvar = BooleanVar(root, True) # wrap around buffer? self.backvar = BooleanVar(root, False) # search backwards? # Access methods def getpat(self): return self.patvar.get() def setpat(self, pat): self.patvar.set(pat) def isre(self): return self.revar.get() def iscase(self): return self.casevar.get() def isword(self): return self.wordvar.get() def iswrap(self): return self.wrapvar.get() def isback(self): return self.backvar.get() # Higher level access methods def setcookedpat(self, pat): "Set pattern after escaping if re." # called only in search.py: 66 if self.isre(): pat = re.escape(pat) self.setpat(pat) def getcookedpat(self): pat = self.getpat() if not self.isre(): # if True, see setcookedpat pat = re.escape(pat) if self.isword(): pat = r"\b%s\b" % pat return pat def getprog(self): "Return compiled cooked search pattern." pat = self.getpat() if not pat: self.report_error(pat, "Empty regular expression") return None pat = self.getcookedpat() flags = 0 if not self.iscase(): flags = flags | re.IGNORECASE try: prog = re.compile(pat, flags) except re.error as what: args = what.args msg = args[0] col = args[1] if len(args) >= 2 else -1 self.report_error(pat, msg, col) return None return prog def report_error(self, pat, msg, col=-1): # Derived class could override this with something fancier msg = "Error: " + str(msg) if pat: msg = msg + "\nPattern: " + str(pat) if col >= 0: msg = msg + "\nOffset: " + str(col) tkMessageBox.showerror("Regular expression error", msg, master=self.root) def search_text(self, text, prog=None, ok=0): '''Return (lineno, matchobj) or None for forward/backward search. This function calls the right function with the right arguments. It directly return the result of that call. Text is a text widget. Prog is a precompiled pattern. The ok parameter is a bit complicated as it has two effects. If there is a selection, the search begin at either end, depending on the direction setting and ok, with ok meaning that the search starts with the selection. Otherwise, search begins at the insert mark. To aid progress, the search functions do not return an empty match at the starting position unless ok is True. ''' if not prog: prog = self.getprog() if not prog: return None # Compilation failed -- stop wrap = self.wrapvar.get() first, last = get_selection(text) if self.isback(): if ok: start = last else: start = first line, col = get_line_col(start) res = self.search_backward(text, prog, line, col, wrap, ok) else: if ok: start = first else: start = last line, col = get_line_col(start) res = self.search_forward(text, prog, line, col, wrap, ok) return res def search_forward(self, text, prog, line, col, wrap, ok=0): wrapped = 0 startline = line chars = text.get("%d.0" % line, "%d.0" % (line+1)) while chars: m = prog.search(chars[:-1], col) if m: if ok or m.end() > col: return line, m line = line + 1 if wrapped and line > startline: break col = 0 ok = 1 chars = text.get("%d.0" % line, "%d.0" % (line+1)) if not chars and wrap: wrapped = 1 wrap = 0 line = 1 chars = text.get("1.0", "2.0") return None def search_backward(self, text, prog, line, col, wrap, ok=0): wrapped = 0 startline = line chars = text.get("%d.0" % line, "%d.0" % (line+1)) while 1: m = search_reverse(prog, chars[:-1], col) if m: if ok or m.start() < col: return line, m line = line - 1 if wrapped and line < startline: break ok = 1 if line <= 0: if not wrap: break wrapped = 1 wrap = 0 pos = text.index("end-1c") line, col = map(int, pos.split(".")) chars = text.get("%d.0" % line, "%d.0" % (line+1)) col = len(chars) - 1 return None def search_reverse(prog, chars, col): '''Search backwards and return an re match object or None. This is done by searching forwards until there is no match. Prog: compiled re object with a search method returning a match. Chars: line of text, without \\n. Col: stop index for the search; the limit for match.end(). ''' m = prog.search(chars) if not m: return None found = None i, j = m.span() # m.start(), m.end() == match slice indexes while i < col and j <= col: found = m if i == j: j = j+1 m = prog.search(chars, j) if not m: break i, j = m.span() return found def get_selection(text): '''Return tuple of 'line.col' indexes from selection or insert mark. ''' try: first = text.index("sel.first") last = text.index("sel.last") except TclError: first = last = None if not first: first = text.index("insert") if not last: last = first return first, last def get_line_col(index): '''Return (line, col) tuple of ints from 'line.col' string.''' line, col = map(int, index.split(".")) # Fails on invalid index return line, col if __name__ == "__main__": from unittest import main main('idlelib.idle_test.test_searchengine', verbosity=2)
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