import re
import tkSimpleDialog
import tkMessageBox

class SearchBinding:
	
	def __init__(self, text):
		self.text = text
		self.pat = ""
		self.prog = None
		self.text.bind("<<find>>", self.find_event)
		self.text.bind("<<find-next>>", self.find_next_event)
		self.text.bind("<<find-same>>", self.find_same_event)
		self.text.bind("<<goto-line>>", self.goto_line_event)
	
	def find_event(self, event):
		default = self.text.get("self.first", "sel.last") or self.pat
		new = tkSimpleDialog.askstring("Find",
			"Regular Expression:",
			initialvalue=default,
			parent=self.text)
		if not new:
			return "break"
		self.pat = new
		try:
			self.prog = re.compile(self.pat)
		except re.error, msg:
			tkMessageBox.showerror("RE error", str(msg),
			                       master=self.text)
			return "break"
		return self.find_next_event(event)
	
	def find_same_event(self, event):
		pat = self.text.get("sel.first", "sel.last")
		if not pat:
			return self.find_event(event)
		self.pat = re.escape(pat)
		self.prog = None
		try:
			self.prog = re.compile(self.pat)
		except re.error, msg:
			tkMessageBox.showerror("RE error", str(message),
			                       master=self.text)
			return "break"
		self.text.mark_set("insert", "sel.last")
		return self.find_next_event(event)

	def find_next_event(self, event):
		if not self.pat:
			return self.find_event(event)
		if not self.prog:
			self.text.bell()
			##print "No program"
			return "break"
		self.text.mark_set("find", "insert")
		while 1:
			chars = self.text.get("find", "find lineend +1c")
			##print "Searching", `chars`
			if not chars:
				self.text.bell()
				##print "end of buffer"
				break
			m = self.prog.search(chars)
			if m:
				i, j = m.span()
				self.text.mark_set("insert", "find +%dc" % j)
				self.text.mark_set("find", "find +%dc" % i)
				self.text.tag_remove("sel", "1.0", "end")
				self.text.tag_add("sel", "find", "insert")
				self.text.see("insert")
				break
			self.text.mark_set("find", "find lineend +1c")
		return "break"
	
	def goto_line_event(self, event):
		lineno = tkSimpleDialog.askinteger("Goto",
						   "Go to line number:")
		if lineno is None:
			return "break"
		if lineno <= 0:
			self.text.bell()
			return "break"
		self.text.mark_set("insert", "%d.0" % lineno)
		self.text.see("insert")