1 files changed, 138 insertions, 0 deletions
diff --git a/src/unlock.py b/src/unlock.py
new file mode 100644
index 0000000..0f954d6
--- /dev/null
+++ b/src/unlock.py
@@ -0,0 +1,138 @@
+import re
+
+LEVEL_RE = re.compile(r'^([0-9]{1,2})-([0-9]{1,2})( secret)?$')
+COMBINER_RE = re.compile(r'[ ]*(and|or)[ ]*')
+
+class UnlockParseError(ValueError):
+	# todo: is this the proper way to make an Error?
+	pass
+
+def parseUnlockText(text):
+	return _parseUnlockBit(text)
+
+def _parseUnlockBit(text):
+	# blank criterion
+	if text == '':
+		return ('always',)
+
+	# is this a simple one...?
+	m = LEVEL_RE.match(text)
+	if m:
+		one, two, secret = m.groups()
+		return ('level', int(one), int(two), (secret != None))
+
+	# OK, let's parse parentheses
+	pLevel = 0
+	endAt = len(text) - 1
+
+	# this could be either AND or OR or nothing at all
+	# we won't know it until we finish parsing!
+	whatCombiner = None
+
+	subTerms = []
+	currentSubTermStart = None
+
+	skip = 0
+	
+	for index, char in enumerate(text):
+		if skip > 0:
+			skip -= 1
+			continue
+
+		if char == '(':
+			if pLevel == 0:
+				currentSubTermStart = index
+			pLevel += 1
+		elif char == ')':
+			pLevel -= 1
+			if pLevel < 0:
+				raise UnlockParseError('close parenthesis without a matching open')
+			elif pLevel == 0:
+				subTerms.append((currentSubTermStart, index, text[currentSubTermStart+1:index]))
+				# are we expecting to see something else?
+				if index == endAt: break
+
+				m = COMBINER_RE.match(text, index + 1)
+				if not m:
+					raise UnlockParseError('something unexpected at %d' % (index+1))
+
+				# what is it?
+				nextCombiner = m.group(1)
+				if whatCombiner is not None and nextCombiner != whatCombiner:
+					raise UnlockParseError('mixed %s and %s in one term. use more parentheses!' % (whatCombiner,nextCombiner))
+				whatCombiner = nextCombiner
+
+				# go right past this, to the next subterm
+				skip = len(m.group(0))
+		else:
+			if pLevel == 0:
+				raise UnlockParseError('something unexpected at %d' % index)
+	
+	# now that we're here, we must have parsed these subterms
+	# do we have a combiner?
+	if whatCombiner is None:
+		assert len(subTerms) == 1
+
+		return _parseUnlockBit(subTerms[0][2])
+	else:
+		return (whatCombiner, map(lambda x: _parseUnlockBit(x[2]), subTerms))
+
+
+
+if __name__ == '__main__':
+	print repr(parseUnlockText('((01-01 secret) and (01-02)) or (02-99 secret) or (01-01)'))
+
+	from sys import exit
+	exit()
+
+
+
+
+
+from common import *
+
+
+
+
+class KPUnlockSpecDialog(QtGui.QDialog):
+	def __init__(self, forWhat, unlockAdjective):
+		QtGui.QDialog.__init__(self)
+
+		self.setWindowTitle('Set Unlock Criteria')
+
+		text = """You may enter various criteria that must be fulfilled for this {0} to be {1}.<br>
+			<br>
+			Here are some examples of what you can use:
+			<ul>
+				<li>01-01 - <i>a single criterion</i></li>
+				<li>01-01 secret - <i>secret exits</i></li>
+				<li>(01-01 secret) and (01-02) - <i>combine two criteria</i></li>
+				<li>((01-01 secret) or (01-02)) and (01-04) - <i>nested criteria</i></li>
+			</ul>
+			Each criterion used on the sides of AND and OR must be surrounded by parentheses.<br>
+			<br>
+			To leave this {0} permanently unlocked, leave the box blank.
+			""".format(forWhat, unlockAdjective)
+
+		self.label = QtGui.QLabel(text)
+		self.label.setWordWrap(True)
+
+		self.textBox = QtGui.QLineEdit()
+		self.textBox.textChanged.connect(self.checkInputValidity)
+
+		self.buttons = QtGui.QDialogButtonBox(
+				QtGui.QDialogButtonBox.Ok | QtGui.QDialogButtonBox.Cancel)
+
+		self.buttons.accepted.connect(self.accept)
+		self.buttons.rejected.connect(self.reject)
+
+		self.layout = QtGui.VBoxLayout()
+		self.layout.addWidget(self.label)
+		self.layout.addWidget(self.textBox)
+		self.layout.addWidget(self.buttons)
+		self.setLayout(self.layout)
+	
+	def checkInputValidity(self, text):
+		self.parsed = parseUnlockText(text)
+		self.buttons.button(QtGui.QDialogButtonBox.Ok).setEnabled(not (self.parsed is None))
+