Merge branch 'master' of github.com:NaoPross/Fading

3 files changed, 300 insertions, 104 deletions

diff --git a/tests/fadingui/QAM/hammingtest.py b/tests/fadingui/QAM/hammingtest.py
new file mode 100755
index 0000000..b72e386
--- /dev/null
+++ b/tests/fadingui/QAM/hammingtest.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python3
+import numpy as np
+from fadingui import frame_obj
+
+f = frame_obj([1,0], 10)
+q = np.random.randint(0, 2, size=26)
+
+parity = f.parity(q)
+enc = np.concatenate([q, parity])
+
+print(q)
+print(parity)
+print(enc)
+print(f.syndrome(enc))
diff --git a/tests/fadingui/QAM/qam_nogui.grc b/tests/fadingui/QAM/qam_nogui.grc
index 2c6abf8..c3d886e 100644
--- a/tests/fadingui/QAM/qam_nogui.grc
+++ b/tests/fadingui/QAM/qam_nogui.grc
@@ -8,7 +8,7 @@ options:
     description: ''
     gen_cmake: 'On'
     gen_linking: dynamic
-    generate_options: no_gui
+    generate_options: qt_gui
     hier_block_src_path: '.:'
     id: qam_nogui
     max_nouts: '0'
@@ -18,7 +18,7 @@ options:
     realtime_scheduling: '1'
     run: 'True'
     run_command: '{python} -u {filename}'
-    run_options: prompt
+    run_options: run
     sizing_mode: fixed
     thread_safe_setters: ''
     title: QAM
@@ -59,7 +59,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [440, 604.0]
+    coordinate: [448, 436.0]
     rotation: 0
     state: true
 - name: eq_gain
@@ -110,6 +110,20 @@ blocks:
     coordinate: [536, 268.0]
     rotation: 0
     state: true
+- name: frame
+  id: fadingui_frame_obj
+  parameters:
+    alias: ''
+    comment: ''
+    payload_len: '32768'
+    preamble: '[190, 239]'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [192, 180.0]
+    rotation: 0
+    state: true
 - name: freq_offset
   id: variable
   parameters:
@@ -138,7 +152,7 @@ blocks:
   id: variable
   parameters:
     comment: ''
-    value: 100e-6
+    value: '0'
   states:
     bus_sink: false
     bus_source: false
@@ -150,7 +164,7 @@ blocks:
   id: variable
   parameters:
     comment: ''
-    value: 2 * 3.141592653589793 / 100
+    value: '.002'
   states:
     bus_sink: false
     bus_source: false
@@ -158,27 +172,6 @@ blocks:
     coordinate: [1792, 428.0]
     rotation: 0
     state: true
-- name: qam_const
-  id: variable_constellation_rect
-  parameters:
-    comment: ''
-    const_points: '[(-3-3j), (-1-3j), (1-3j), (3-3j), (-3-1j), (-1-1j), (1-1j), (3-1j),
-      (-3+1j), (-1+1j), (1+1j), (3+1j), (-3+3j), (-1+3j), (1+3j), (3+3j)]'
-    imag_sect: '1'
-    precision: '4'
-    real_sect: '1'
-    rot_sym: '4'
-    soft_dec_lut: None
-    sym_map: '[0, 4, 12, 8, 1, 5, 13, 9, 3, 7, 15, 11, 2, 6, 14, 10]'
-    w_imag_sect: '1'
-    w_real_sect: '1'
-  states:
-    bus_sink: false
-    bus_source: false
-    bus_structure: null
-    coordinate: [440, 444.0]
-    rotation: 0
-    state: true
 - name: rrc_taps
   id: variable
   parameters:
@@ -200,7 +193,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [192, 12.0]
+    coordinate: [232, 12.0]
     rotation: 0
     state: enabled
 - name: sps
@@ -239,18 +232,6 @@ blocks:
     coordinate: [1184, 556.0]
     rotation: 0
     state: true
-- name: variable_4
-  id: variable
-  parameters:
-    comment: ''
-    value: '0'
-  states:
-    bus_sink: false
-    bus_source: false
-    bus_structure: null
-    coordinate: [1312, 556.0]
-    rotation: 0
-    state: true
 - name: blocks_null_sink_0
   id: blocks_null_sink
   parameters:
@@ -265,7 +246,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [2336, 424.0]
+    coordinate: [2824, 312.0]
     rotation: 0
     state: true
 - name: blocks_throttle_0
@@ -284,27 +265,9 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [688, 356.0]
+    coordinate: [720, 356.0]
     rotation: 0
     state: enabled
-- name: blocks_vector_to_stream_0
-  id: blocks_vector_to_stream
-  parameters:
-    affinity: ''
-    alias: ''
-    comment: ''
-    maxoutbuf: '0'
-    minoutbuf: '0'
-    num_items: '2048'
-    type: byte
-    vlen: '1'
-  states:
-    bus_sink: false
-    bus_source: false
-    bus_structure: null
-    coordinate: [248, 360.0]
-    rotation: 0
-    state: true
 - name: channels_channel_model_0
   id: channels_channel_model
   parameters:
@@ -429,7 +392,7 @@ blocks:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [2136, 420.0]
+    coordinate: [2144, 452.0]
     rotation: 0
     state: true
 - name: digital_pfb_clock_sync_xxx_0
@@ -461,17 +424,15 @@ blocks:
     affinity: ''
     alias: ''
     comment: ''
-    file_list: '["./lena512color.tiff"]'
-    header_len: '11'
+    fname: /home/god/Documents/Fading/tests/fadingui/QAM/lena512color.tiff
+    frame_obj: frame
     maxoutbuf: '0'
     minoutbuf: '0'
-    sock_addr: udp://
-    vec_len: '2037'
   states:
     bus_sink: false
     bus_source: false
     bus_structure: null
-    coordinate: [72, 212.0]
+    coordinate: [144, 284.0]
     rotation: 0
     state: true
 - name: fadingui_dearpygui_sink_0
@@ -488,21 +449,150 @@ blocks:
     bus_structure: null
     coordinate: [2096, 180.0]
     rotation: 0
+    state: disabled
+- name: fadingui_deframer_0
+  id: fadingui_deframer
+  parameters:
+    affinity: ''
+    alias: ''
+    comment: ''
+    frame_obj: frame
+    maxoutbuf: '0'
+    minoutbuf: '0'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [2592, 452.0]
+    rotation: 0
     state: true
+- name: fadingui_xor_frame_sync_0
+  id: fadingui_xor_frame_sync
+  parameters:
+    affinity: ''
+    alias: ''
+    buffer_size: frame.length * 4
+    comment: ''
+    maxoutbuf: '0'
+    minoutbuf: '0'
+    pattern: frame.preamble
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [2312, 444.0]
+    rotation: 0
+    state: true
+- name: qtgui_const_sink_x_0
+  id: qtgui_const_sink_x
+  parameters:
+    affinity: ''
+    alias: ''
+    alpha1: '1.0'
+    alpha10: '1.0'
+    alpha2: '1.0'
+    alpha3: '1.0'
+    alpha4: '1.0'
+    alpha5: '1.0'
+    alpha6: '1.0'
+    alpha7: '1.0'
+    alpha8: '1.0'
+    alpha9: '1.0'
+    autoscale: 'False'
+    axislabels: 'True'
+    color1: '"blue"'
+    color10: '"red"'
+    color2: '"red"'
+    color3: '"red"'
+    color4: '"red"'
+    color5: '"red"'
+    color6: '"red"'
+    color7: '"red"'
+    color8: '"red"'
+    color9: '"red"'
+    comment: ''
+    grid: 'False'
+    gui_hint: ''
+    label1: ''
+    label10: ''
+    label2: ''
+    label3: ''
+    label4: ''
+    label5: ''
+    label6: ''
+    label7: ''
+    label8: ''
+    label9: ''
+    legend: 'True'
+    marker1: '0'
+    marker10: '0'
+    marker2: '0'
+    marker3: '0'
+    marker4: '0'
+    marker5: '0'
+    marker6: '0'
+    marker7: '0'
+    marker8: '0'
+    marker9: '0'
+    name: '""'
+    nconnections: '3'
+    size: '1024'
+    style1: '0'
+    style10: '0'
+    style2: '0'
+    style3: '0'
+    style4: '0'
+    style5: '0'
+    style6: '0'
+    style7: '0'
+    style8: '0'
+    style9: '0'
+    tr_chan: '0'
+    tr_level: '0.0'
+    tr_mode: qtgui.TRIG_MODE_FREE
+    tr_slope: qtgui.TRIG_SLOPE_POS
+    tr_tag: '""'
+    type: complex
+    update_time: '0.10'
+    width1: '1'
+    width10: '1'
+    width2: '1'
+    width3: '1'
+    width4: '1'
+    width5: '1'
+    width6: '1'
+    width7: '1'
+    width8: '1'
+    width9: '1'
+    xmax: '2'
+    xmin: '-2'
+    ymax: '2'
+    ymin: '-2'
+  states:
+    bus_sink: false
+    bus_source: false
+    bus_structure: null
+    coordinate: [2040, 32.0]
+    rotation: 0
+    state: enabled
 
 connections:
 - [blocks_throttle_0, '0', channels_channel_model_0, '0']
-- [blocks_vector_to_stream_0, '0', digital_constellation_modulator_0, '0']
 - [channels_channel_model_0, '0', digital_pfb_clock_sync_xxx_0, '0']
 - [digital_cma_equalizer_cc_0, '0', digital_costas_loop_cc_0, '0']
+- [digital_cma_equalizer_cc_0, '0', qtgui_const_sink_x_0, '1']
 - [digital_constellation_decoder_cb_0, '0', digital_diff_decoder_bb_0, '0']
 - [digital_constellation_modulator_0, '0', blocks_throttle_0, '0']
 - [digital_costas_loop_cc_0, '0', digital_constellation_decoder_cb_0, '0']
 - [digital_costas_loop_cc_0, '0', fadingui_dearpygui_sink_0, '0']
+- [digital_costas_loop_cc_0, '0', qtgui_const_sink_x_0, '2']
 - [digital_diff_decoder_bb_0, '0', digital_map_bb_0, '0']
-- [digital_map_bb_0, '0', blocks_null_sink_0, '0']
+- [digital_map_bb_0, '0', fadingui_xor_frame_sync_0, '0']
 - [digital_pfb_clock_sync_xxx_0, '0', digital_cma_equalizer_cc_0, '0']
-- [fadingui_datasource_0, '0', blocks_vector_to_stream_0, '0']
+- [digital_pfb_clock_sync_xxx_0, '0', qtgui_const_sink_x_0, '0']
+- [fadingui_datasource_0, '0', digital_constellation_modulator_0, '0']
+- [fadingui_deframer_0, '0', blocks_null_sink_0, '0']
+- [fadingui_xor_frame_sync_0, '0', fadingui_deframer_0, '0']
 
 metadata:
   file_format: 1
diff --git a/tests/fadingui/QAM/qam_nogui.py b/tests/fadingui/QAM/qam_nogui.py
index e9aa15b..6cde63d 100755
--- a/tests/fadingui/QAM/qam_nogui.py
+++ b/tests/fadingui/QAM/qam_nogui.py
@@ -9,6 +9,21 @@
 # Author: Pross Naoki, Halter Sara Cinzia
 # GNU Radio version: 3.8.2.0
 
+from distutils.version import StrictVersion
+
+if __name__ == '__main__':
+    import ctypes
+    import sys
+    if sys.platform.startswith('linux'):
+        try:
+            x11 = ctypes.cdll.LoadLibrary('libX11.so')
+            x11.XInitThreads()
+        except:
+            print("Warning: failed to XInitThreads()")
+
+from PyQt5 import Qt
+from gnuradio import qtgui
+import sip
 from gnuradio import blocks
 from gnuradio import channels
 from gnuradio.filter import firdes
@@ -21,11 +36,40 @@ from gnuradio.eng_arg import eng_float, intx
 from gnuradio import eng_notation
 import fadingui
 
+from gnuradio import qtgui
 
-class qam_nogui(gr.top_block):
+class qam_nogui(gr.top_block, Qt.QWidget):
 
     def __init__(self):
         gr.top_block.__init__(self, "QAM")
+        Qt.QWidget.__init__(self)
+        self.setWindowTitle("QAM")
+        qtgui.util.check_set_qss()
+        try:
+            self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
+        except:
+            pass
+        self.top_scroll_layout = Qt.QVBoxLayout()
+        self.setLayout(self.top_scroll_layout)
+        self.top_scroll = Qt.QScrollArea()
+        self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
+        self.top_scroll_layout.addWidget(self.top_scroll)
+        self.top_scroll.setWidgetResizable(True)
+        self.top_widget = Qt.QWidget()
+        self.top_scroll.setWidget(self.top_widget)
+        self.top_layout = Qt.QVBoxLayout(self.top_widget)
+        self.top_grid_layout = Qt.QGridLayout()
+        self.top_layout.addLayout(self.top_grid_layout)
+
+        self.settings = Qt.QSettings("GNU Radio", "qam_nogui")
+
+        try:
+            if StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
+                self.restoreGeometry(self.settings.value("geometry").toByteArray())
+            else:
+                self.restoreGeometry(self.settings.value("geometry"))
+        except:
+            pass
 
         ##################################################
         # Variables
@@ -33,16 +77,14 @@ class qam_nogui(gr.top_block):
         self.sps = sps = 4
         self.nfilts = nfilts = 32
         self.excess_bw = excess_bw = 350e-3
-        self.variable_4 = variable_4 = 0
         self.timing_loop_bw = timing_loop_bw = 2 * 3.141592653589793 / 100
         self.time_offset = time_offset = 1
         self.samp_rate = samp_rate = 32000
         self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), excess_bw, 45*nfilts)
-        self.qam_const = qam_const = digital.constellation_rect([(-3-3j), (-1-3j), (1-3j), (3-3j), (-3-1j), (-1-1j), (1-1j), (3-1j), (-3+1j), (-1+1j), (1+1j), (3+1j), (-3+3j), (-1+3j), (1+3j), (3+3j)], [0, 4, 12, 8, 1, 5, 13, 9, 3, 7, 15, 11, 2, 6, 14, 10],
-        4, 1, 1, 1, 1).base()
-        self.phase_bw = phase_bw = 2 * 3.141592653589793 / 100
-        self.noise_volt = noise_volt = 100e-6
+        self.phase_bw = phase_bw = .002
+        self.noise_volt = noise_volt = 0
         self.freq_offset = freq_offset = 0
+        self.frame = frame = fadingui.frame_obj(preamble=[190, 239], payload_len=32768)
         self.eq_ntaps = eq_ntaps = 15
         self.eq_mod = eq_mod = 1
         self.eq_gain = eq_gain = 10e-3
@@ -52,8 +94,49 @@ class qam_nogui(gr.top_block):
         ##################################################
         # Blocks
         ##################################################
-        self.fadingui_dearpygui_sink_0 = fadingui.dearpygui_sink(sock_addr='udp://localhost:31415', ui_element_id=0)
-        self.fadingui_datasource_0 = fadingui.datasource(vec_len=2037, header_len=11, sock_addr='udp://', file_list=["./lena512color.tiff"])
+        self.qtgui_const_sink_x_0 = qtgui.const_sink_c(
+            1024, #size
+            "", #name
+            3 #number of inputs
+        )
+        self.qtgui_const_sink_x_0.set_update_time(0.10)
+        self.qtgui_const_sink_x_0.set_y_axis(-2, 2)
+        self.qtgui_const_sink_x_0.set_x_axis(-2, 2)
+        self.qtgui_const_sink_x_0.set_trigger_mode(qtgui.TRIG_MODE_FREE, qtgui.TRIG_SLOPE_POS, 0.0, 0, "")
+        self.qtgui_const_sink_x_0.enable_autoscale(False)
+        self.qtgui_const_sink_x_0.enable_grid(False)
+        self.qtgui_const_sink_x_0.enable_axis_labels(True)
+
+
+        labels = ['', '', '', '', '',
+            '', '', '', '', '']
+        widths = [1, 1, 1, 1, 1,
+            1, 1, 1, 1, 1]
+        colors = ["blue", "red", "red", "red", "red",
+            "red", "red", "red", "red", "red"]
+        styles = [0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0]
+        markers = [0, 0, 0, 0, 0,
+            0, 0, 0, 0, 0]
+        alphas = [1.0, 1.0, 1.0, 1.0, 1.0,
+            1.0, 1.0, 1.0, 1.0, 1.0]
+
+        for i in range(3):
+            if len(labels[i]) == 0:
+                self.qtgui_const_sink_x_0.set_line_label(i, "Data {0}".format(i))
+            else:
+                self.qtgui_const_sink_x_0.set_line_label(i, labels[i])
+            self.qtgui_const_sink_x_0.set_line_width(i, widths[i])
+            self.qtgui_const_sink_x_0.set_line_color(i, colors[i])
+            self.qtgui_const_sink_x_0.set_line_style(i, styles[i])
+            self.qtgui_const_sink_x_0.set_line_marker(i, markers[i])
+            self.qtgui_const_sink_x_0.set_line_alpha(i, alphas[i])
+
+        self._qtgui_const_sink_x_0_win = sip.wrapinstance(self.qtgui_const_sink_x_0.pyqwidget(), Qt.QWidget)
+        self.top_grid_layout.addWidget(self._qtgui_const_sink_x_0_win)
+        self.fadingui_xor_frame_sync_0 = fadingui.xor_frame_sync(sync_pattern=frame.preamble, buffer_size=frame.length * 4)
+        self.fadingui_deframer_0 = fadingui.deframer(frame_obj=frame)
+        self.fadingui_datasource_0 = fadingui.datasource(frame_obj=frame, filename='/home/god/Documents/Fading/tests/fadingui/QAM/lena512color.tiff')
         self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, timing_loop_bw, rrc_taps, nfilts, nfilts/2, 1.5, 1)
         self.digital_map_bb_0 = digital.map_bb([0, 1, 3, 2])
         self.digital_diff_decoder_bb_0 = digital.diff_decoder_bb(4)
@@ -75,7 +158,6 @@ class qam_nogui(gr.top_block):
             taps=chn_taps,
             noise_seed=0,
             block_tags=False)
-        self.blocks_vector_to_stream_0 = blocks.vector_to_stream(gr.sizeof_char*1, 2048)
         self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
         self.blocks_null_sink_0 = blocks.null_sink(gr.sizeof_char*1)
 
@@ -85,18 +167,26 @@ class qam_nogui(gr.top_block):
         # Connections
         ##################################################
         self.connect((self.blocks_throttle_0, 0), (self.channels_channel_model_0, 0))
-        self.connect((self.blocks_vector_to_stream_0, 0), (self.digital_constellation_modulator_0, 0))
         self.connect((self.channels_channel_model_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0))
         self.connect((self.digital_cma_equalizer_cc_0, 0), (self.digital_costas_loop_cc_0, 0))
+        self.connect((self.digital_cma_equalizer_cc_0, 0), (self.qtgui_const_sink_x_0, 1))
         self.connect((self.digital_constellation_decoder_cb_0, 0), (self.digital_diff_decoder_bb_0, 0))
         self.connect((self.digital_constellation_modulator_0, 0), (self.blocks_throttle_0, 0))
         self.connect((self.digital_costas_loop_cc_0, 0), (self.digital_constellation_decoder_cb_0, 0))
-        self.connect((self.digital_costas_loop_cc_0, 0), (self.fadingui_dearpygui_sink_0, 0))
+        self.connect((self.digital_costas_loop_cc_0, 0), (self.qtgui_const_sink_x_0, 2))
         self.connect((self.digital_diff_decoder_bb_0, 0), (self.digital_map_bb_0, 0))
-        self.connect((self.digital_map_bb_0, 0), (self.blocks_null_sink_0, 0))
+        self.connect((self.digital_map_bb_0, 0), (self.fadingui_xor_frame_sync_0, 0))
         self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_cma_equalizer_cc_0, 0))
-        self.connect((self.fadingui_datasource_0, 0), (self.blocks_vector_to_stream_0, 0))
+        self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.qtgui_const_sink_x_0, 0))
+        self.connect((self.fadingui_datasource_0, 0), (self.digital_constellation_modulator_0, 0))
+        self.connect((self.fadingui_deframer_0, 0), (self.blocks_null_sink_0, 0))
+        self.connect((self.fadingui_xor_frame_sync_0, 0), (self.fadingui_deframer_0, 0))
+
 
+    def closeEvent(self, event):
+        self.settings = Qt.QSettings("GNU Radio", "qam_nogui")
+        self.settings.setValue("geometry", self.saveGeometry())
+        event.accept()
 
     def get_sps(self):
         return self.sps
@@ -119,12 +209,6 @@ class qam_nogui(gr.top_block):
         self.excess_bw = excess_bw
         self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), self.excess_bw, 45*self.nfilts))
 
-    def get_variable_4(self):
-        return self.variable_4
-
-    def set_variable_4(self, variable_4):
-        self.variable_4 = variable_4
-
     def get_timing_loop_bw(self):
         return self.timing_loop_bw
 
@@ -153,12 +237,6 @@ class qam_nogui(gr.top_block):
         self.rrc_taps = rrc_taps
         self.digital_pfb_clock_sync_xxx_0.update_taps(self.rrc_taps)
 
-    def get_qam_const(self):
-        return self.qam_const
-
-    def set_qam_const(self, qam_const):
-        self.qam_const = qam_const
-
     def get_phase_bw(self):
         return self.phase_bw
 
@@ -180,6 +258,12 @@ class qam_nogui(gr.top_block):
         self.freq_offset = freq_offset
         self.channels_channel_model_0.set_frequency_offset(self.freq_offset)
 
+    def get_frame(self):
+        return self.frame
+
+    def set_frame(self, frame):
+        self.frame = frame
+
     def get_eq_ntaps(self):
         return self.eq_ntaps
 
@@ -220,26 +304,34 @@ class qam_nogui(gr.top_block):
 def main(top_block_cls=qam_nogui, options=None):
     if gr.enable_realtime_scheduling() != gr.RT_OK:
         print("Error: failed to enable real-time scheduling.")
+
+    if StrictVersion("4.5.0") <= StrictVersion(Qt.qVersion()) < StrictVersion("5.0.0"):
+        style = gr.prefs().get_string('qtgui', 'style', 'raster')
+        Qt.QApplication.setGraphicsSystem(style)
+    qapp = Qt.QApplication(sys.argv)
+
     tb = top_block_cls()
 
-    def sig_handler(sig=None, frame=None):
-        tb.stop()
-        tb.wait()
+    tb.start()
 
-        sys.exit(0)
+    tb.show()
+
+    def sig_handler(sig=None, frame=None):
+        Qt.QApplication.quit()
 
     signal.signal(signal.SIGINT, sig_handler)
     signal.signal(signal.SIGTERM, sig_handler)
 
-    tb.start()
+    timer = Qt.QTimer()
+    timer.start(500)
+    timer.timeout.connect(lambda: None)
 
-    try:
-        input('Press Enter to quit: ')
-    except EOFError:
-        pass
-    tb.stop()
-    tb.wait()
+    def quitting():
+        tb.stop()
+        tb.wait()
 
+    qapp.aboutToQuit.connect(quitting)
+    qapp.exec_()
 
 if __name__ == '__main__':
     main()