initial commit

nex.py

@@ -0,0 +1,72 @@
+import sys
+import socket
+
+PORT = 1900
+
+
+class Session:
+    def __init__(self):
+        self.history = [Page('home')]
+        self.current_page = 0
+
+    def back(self):
+        if self.current_page > 0:
+            self.current_page -= 1
+        self.render()
+
+    def forward(self):
+        if self.current_page < len(self.history) - 1:
+            self.current_page += 1
+        self.render()
+
+    def load(self, url):
+        self.current_page += 1
+        if self.current_page >= len(self.history):
+            self.history.append(Page(url))
+        else:
+            self.history[self.current_page] = Page(url)
+        self.history[self.current_page].request()
+
+    def render(self):
+        print(self.history[self.current_page].content)
+
+
+class Page:
+    def __init__(self, url):
+        self.url = url
+        self.host, self.selector = parse_url(url)
+        self.content = ''
+
+    def request(self):
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
+            sock.connect((self.host, PORT))
+            selector = self.selector + '\r\n'
+            sock.sendall(selector.encode('ascii'))
+            buf = bytearray()
+            while True:
+                data = sock.recv(4096)
+                if len(data) == 0:
+                    break
+                buf.extend(data)
+            self.content = buf.decode('ascii')
+
+
+def parse_url(url: str) -> (str, str):
+    clean_url = url.replace('nex://', '')
+    split_url = clean_url.split('/', 1)
+    if len(split_url) == 1:
+        return clean_url, ''
+    return split_url[0], split_url[1]
+
+
+if __name__ == '__main__':
+    session = Session()
+    while True:
+        url = input('Enter a URL')
+        session.load(url)
+        session.render()
+        command = input('Go [b]ack or [f]orward')
+        if command == 'b':
+            session.back()
+        elif command == 'f':
+            session.forward()