Add utf8 to chat example

examples/low_level_api/util.py

@@ -0,0 +1,95 @@
+
+ANSI_COLOR_RESET = "\x1b[0m"
+ANSI_COLOR_YELLOW = "\x1b[33m"
+ANSI_BOLD = "\x1b[1m"
+ANSI_COLOR_GREEN = "\x1b[32m"
+
+CONSOLE_COLOR_DEFAULT = ANSI_COLOR_RESET
+CONSOLE_COLOR_PROMPT = ANSI_COLOR_YELLOW
+CONSOLE_COLOR_USER_INPUT = ANSI_BOLD + ANSI_COLOR_GREEN
+
+# Iterative search
+# Actively searches and prevents a pattern from being returned
+class IterSearch:
+	def __init__(self, pattern):
+		self.pattern = list(pattern)
+		self.buffer = []
+
+	def __call__(self, char):
+		self.buffer += [char]
+
+		if (self.pattern[:len(self.buffer)] == self.buffer):
+			if (len(self.buffer) >= len(self.pattern)):
+				self.buffer.clear()
+			return []
+
+		_tmp = self.buffer[:]
+		self.buffer.clear()
+		return _tmp
+
+class Circle:
+	def __init__(self, size, default=0):
+		self.list = [default] * size
+		self.maxsize = size
+		self.size = 0
+		self.offset = 0
+
+	def append(self, elem):
+		if self.size < self.maxsize:
+			self.list[self.size] = elem
+			self.size += 1
+		else:
+			self.list[self.offset] = elem
+			self.offset = (self.offset + 1) % self.maxsize
+
+	def __getitem__(self, val):
+		if isinstance(val, int):
+			if 0 > val or val >= self.size:
+				raise IndexError('Index out of range')
+			return self.list[val] if self.size < self.maxsize else self.list[(self.offset + val) % self.maxsize]
+		elif isinstance(val, slice):
+			start, stop, step = val.start, val.stop, val.step
+			if step is None:
+				step = 1
+			if start is None:
+				start = 0
+			if stop is None:
+				stop = self.size
+			if start < 0:
+				start = self.size + start
+			if stop < 0:
+				stop = self.size + stop
+
+			indices = range(start, stop, step)
+			return [self.list[(self.offset + i) % self.maxsize] for i in indices if i < self.size]
+		else:
+			raise TypeError('Invalid argument type')
+
+
+
+
+if __name__ == "__main__":
+	c = Circle(5)
+
+	c.append(1)
+	print(c.list)
+	print(c[:])
+	assert c[0] == 1
+	assert c[:5] == [1]
+
+	for i in range(2,5+1):
+		c.append(i)
+	print(c.list)
+	print(c[:])
+	assert c[0] == 1
+	assert c[:5] == [1,2,3,4,5]
+
+	for i in range(5+1,9+1):
+		c.append(i)
+	print(c.list)
+	print(c[:])
+	assert c[0] == 5
+	assert c[:5] == [5,6,7,8,9]
+	#assert c[:-5] == [5,6,7,8,9]
+	assert c[:10] == [5,6,7,8,9]
+