74 lines
2.9 KiB
Python
74 lines
2.9 KiB
Python
# Sdcard file looping support
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#
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# Copyright (C) 2021 Jason S. McMullan <jason.mcmullan@gmail.com>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import logging
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class SDCardLoop:
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def __init__(self, config):
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printer = config.get_printer()
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self.sdcard = printer.load_object(config, "virtual_sdcard")
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self.gcode = printer.lookup_object('gcode')
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self.gcode.register_command(
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"SDCARD_LOOP_BEGIN", self.cmd_SDCARD_LOOP_BEGIN,
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desc=self.cmd_SDCARD_LOOP_BEGIN_help)
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self.gcode.register_command(
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"SDCARD_LOOP_END", self.cmd_SDCARD_LOOP_END,
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desc=self.cmd_SDCARD_LOOP_END_help)
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self.gcode.register_command(
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"SDCARD_LOOP_DESIST", self.cmd_SDCARD_LOOP_DESIST,
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desc=self.cmd_SDCARD_LOOP_DESIST_help)
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self.loop_stack = []
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cmd_SDCARD_LOOP_BEGIN_help = "Begins a looped section in the SD file."
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def cmd_SDCARD_LOOP_BEGIN(self, gcmd):
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count = gcmd.get_int("COUNT", minval=0)
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if not self.loop_begin(count):
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raise gcmd.error("Only permitted in SD file.")
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cmd_SDCARD_LOOP_END_help = "Ends a looped section in the SD file."
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def cmd_SDCARD_LOOP_END(self, gcmd):
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if not self.loop_end():
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raise gcmd.error("Only permitted in SD file.")
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cmd_SDCARD_LOOP_DESIST_help = "Stops iterating the current loop stack."
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def cmd_SDCARD_LOOP_DESIST(self, gcmd):
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if not self.loop_desist():
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raise gcmd.error("Only permitted outside of a SD file.")
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def loop_begin(self, count):
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if not self.sdcard.is_cmd_from_sd():
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# Can only run inside of an SD file
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return False
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self.loop_stack.append((count, self.sdcard.get_file_position()))
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return True
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def loop_end(self):
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if not self.sdcard.is_cmd_from_sd():
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# Can only run inside of an SD file
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return False
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# If the stack is empty, no need to skip back
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if len(self.loop_stack) == 0:
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return True
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# Get iteration count and return position
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count, position = self.loop_stack.pop()
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if count == 0: # Infinite loop
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self.sdcard.set_file_position(position)
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self.loop_stack.append((0, position))
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elif count == 1: # Last repeat
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# Nothing to do
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pass
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else:
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# At the next opportunity, seek back to the start of the loop
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self.sdcard.set_file_position(position)
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# Decrement the count by 1, and add the position back to the stack
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self.loop_stack.append((count - 1, position))
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return True
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def loop_desist(self):
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if self.sdcard.is_cmd_from_sd():
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# Can only run outside of an SD file
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return False
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logging.info("Desisting existing SD loops")
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self.loop_stack = []
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return True
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def load_config(config):
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return SDCardLoop(config)
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