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nigel.stanger
/
process_podcast
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Replaced import * with explicit name imports.
master
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3943c13
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62e5bb9f78045482ffe7c4b3afc669991f8d4d23
Nigel Stanger
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on 28 Aug 2018
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config_parser.py
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config_parser.py
#!/usr/bin/env python3 import sys from pyparsing import ( alphanums, delimitedList, nums, oneOf, pythonStyleComment, replaceWith, Combine, Group, Literal, OneOrMore, Optional, Or, ParseException, ParseSyntaxException, ParseResults, Word, ZeroOrMore, ) # pyparsing documentation: # https://sourceforge.net/p/pyparsing/code/HEAD/tree/trunk/src/HowToUsePyparsing.txt#l302 INPUTSPEC_DEFAULTS = {"type": None, "filename": None, "num": None} TIMESTAMP_DEFAULTS = {"hh": 0, "mm": 0, "ms": 0} # see http://stackoverflow.com/questions/11180622/optional-string-segment-in-pyparsing def default_input_fields(fields): """Set missing input specification values to defaults.""" set_defaults(fields, INPUTSPEC_DEFAULTS) def default_timestamp_fields(fields): """Set missing timestamp values to defaults.""" set_defaults(fields, TIMESTAMP_DEFAULTS) def set_defaults(fields, defaults): """Set missing field values to defaults.""" undefined = set(defaults.keys()) - set(fields.keys()) for k in undefined: v = defaults[k] # see http://pyparsing.wikispaces.com/share/view/71042464 fields[k] = v fields.append(v) def parser_bnf(): """Grammar for parsing podcast configuration files.""" at = Literal("@").suppress() caret = Literal("^") colon = Literal(":").suppress() left_bracket = Literal("[").suppress() period = Literal(".").suppress() right_bracket = Literal("]").suppress() # zero_index ::= [0-9]+ zero_index = Word(nums).setParseAction(lambda s, l, t: int(t[0])) # filename ::= [A-Za-z0-9][-A-Za-z0-9._ ]+ filename_first = Word(alphanums, exact=1) filename_rest = Word(alphanums + "-_/. ") filename = Combine(filename_first + Optional(filename_rest)) # millisecs ::= "." [0-9]+ millisecs = (Word(nums).setParseAction( lambda s, l, t: int(t[0][:3].ljust(3, "0"))) .setResultsName("ms")) # hours, minutes, seconds ::= zero_index hours = zero_index.setResultsName("hh") minutes = zero_index.setResultsName("mm") seconds = zero_index.setResultsName("ss") hours_minutes = hours + colon + minutes + colon | minutes + colon secs_millisecs = (seconds + Optional(period + millisecs) | period + millisecs) # timestamp ::= [[hours ":"] minutes ":"] seconds ["." millisecs] timestamp = Optional(hours_minutes) + secs_millisecs # duration_file ::= "@", filename # We need a separate item for a lonely duration file timestamp so # that we can attach a parse action just to the lonely case. Using # duration_file alone means the parse action is attached to all # instances of duration_file. duration_file = at + filename.setResultsName("filename") lonely_duration_file = at + filename.setResultsName("filename") # timespecs ::= timestamp [duration_file | {timestamp}] # If duration_file timestamp is lonely, prepend a zero timestamp. timespecs = Or( [lonely_duration_file.setParseAction( lambda s, l, t: [timestamp.parseString("00:00:00.000"), t]), Group(timestamp) + duration_file, OneOrMore(Group(timestamp.setParseAction(default_timestamp_fields)))]) # last_frame ::= "-1" | "last" last_frame = oneOf(["-1", "last"]).setParseAction(replaceWith(-1)) # frame_number ::= ":" (zero_index | last_frame) frame_number = colon - (zero_index | last_frame).setResultsName("num") # stream_number ::= ":" zero_index stream_number = colon - zero_index.setResultsName("num") # input_file ::= ":" [filename] input_file = colon - Optional(filename).setResultsName("filename") # previous_segment ::= ":" "^" previous_segment = colon - caret.setResultsName("filename") # frame_input_file ::= input_file | previous_segment frame_input_file = Or([input_file, previous_segment]) # av_trailer ::= input_file [stream_number] av_trailer = input_file + Optional(stream_number) # frame_type ::= "frame" | "f" frame_type = oneOf(["f", "frame"]).setParseAction(replaceWith("frame")) # frame_input ::= frame_type [frame_input_file [frame_number]] frame_input = (frame_type.setResultsName("type") + Optional(frame_input_file + Optional(frame_number))) # video_type ::= "video" | "v" video_type = oneOf(["v", "video"]).setParseAction(replaceWith("video")) # audio_type ::= "audio" | "a" audio_type = oneOf(["a", "audio"]).setParseAction(replaceWith("audio")) # av_input ::= (audio_type | video_type) [av_trailer] av_input = ((audio_type | video_type).setResultsName("type") + Optional(av_trailer)) # inputspec ::= "[" (av_input | frame_input) "]" inputspec = (left_bracket + delimitedList(av_input | frame_input, delim=":") .setParseAction(default_input_fields) - right_bracket) # segmentspec ::= inputspec [timespecs] segmentspec = Group(inputspec + Group(Optional(timespecs)).setResultsName("times")) # config ::= {segmentspec} config = ZeroOrMore(segmentspec) config.ignore(pythonStyleComment) return config def parse_configuration_file(config_file): """Parse a podcast configuration file.""" try: parser = parser_bnf() result = parser.parseFile(config_file, parseAll=True) except (ParseException, ParseSyntaxException) as e: print("ERROR: {m}".format(m=str(e))) sys.exit(1) return result def parse_configuration_string(config_string): """Parse a podcast configuration file.""" try: parser = parser_bnf() result = parser.parseString(config_string, parseAll=True) except (ParseException, ParseSyntaxException) as e: print("ERROR: {m}".format(m=str(e))) sys.exit(1) return result def test_parser(): tests = ["test/config1.txt", "test/config2.txt", "test/config3.txt", "test/config4.txt", "test/config5.txt"] for t in tests: print("==={f}===".format(f=t)) r = parse_configuration_file(t) for s in r: print(s) print(" type = {t}".format(t=s["type"])) print(" filename = '{f}'".format(f=s["filename"])) print(" num = {n}".format(n=s["num"])) print(" times = {t}".format(t=s["times"])) for i, t in enumerate(s["times"]): if (isinstance(t, str)): print(" punch out after duration of '{f}'".format(f=t)) if (isinstance(t, ParseResults)): if (i % 2 == 0): print(" punch in at: {hh:02d}:{mm:02d}:{ss:02d}.{ms:03d}".format(hh=t["hh"], mm=t["mm"], ss=t["ss"], ms=t["ms"])) else: print(" punch out at: {hh:02d}:{mm:02d}:{ss:02d}.{ms:03d}".format(hh=t["hh"], mm=t["mm"], ss=t["ss"], ms=t["ms"])) print() if (__name__ == "__main__"): test_parser()
#!/usr/bin/env python3 import sys from pyparsing import * # pyparsing documentation: # https://sourceforge.net/p/pyparsing/code/HEAD/tree/trunk/src/HowToUsePyparsing.txt#l302 INPUTSPEC_DEFAULTS = {"type": None, "filename": None, "num": None} TIMESTAMP_DEFAULTS = {"hh": 0, "mm": 0, "ms": 0} # see http://stackoverflow.com/questions/11180622/optional-string-segment-in-pyparsing def default_input_fields(fields): """Set missing input specification values to defaults.""" set_defaults(fields, INPUTSPEC_DEFAULTS) def default_timestamp_fields(fields): """Set missing timestamp values to defaults.""" set_defaults(fields, TIMESTAMP_DEFAULTS) def set_defaults(fields, defaults): """Set missing field values to defaults.""" undefined = set(defaults.keys()) - set(fields.keys()) for k in undefined: v = defaults[k] # see http://pyparsing.wikispaces.com/share/view/71042464 fields[k] = v fields.append(v) def parser_bnf(): """Grammar for parsing podcast configuration files.""" at = Literal("@").suppress() caret = Literal("^") colon = Literal(":").suppress() left_bracket = Literal("[").suppress() period = Literal(".").suppress() right_bracket = Literal("]").suppress() # zero_index ::= [0-9]+ zero_index = Word(nums).setParseAction(lambda s, l, t: int(t[0])) # filename ::= [A-Za-z0-9][-A-Za-z0-9._ ]+ filename_first = Word(alphanums, exact=1) filename_rest = Word(alphanums + "-_/. ") filename = Combine(filename_first + Optional(filename_rest)) # millisecs ::= "." [0-9]+ millisecs = (Word(nums).setParseAction( lambda s, l, t: int(t[0][:3].ljust(3, "0"))) .setResultsName("ms")) # hours, minutes, seconds ::= zero_index hours = zero_index.setResultsName("hh") minutes = zero_index.setResultsName("mm") seconds = zero_index.setResultsName("ss") hours_minutes = hours + colon + minutes + colon | minutes + colon secs_millisecs = (seconds + Optional(period + millisecs) | period + millisecs) # timestamp ::= [[hours ":"] minutes ":"] seconds ["." millisecs] timestamp = Optional(hours_minutes) + secs_millisecs # duration_file ::= "@", filename # We need a separate item for a lonely duration file timestamp so # that we can attach a parse action just to the lonely case. Using # duration_file alone means the parse action is attached to all # instances of duration_file. duration_file = at + filename.setResultsName("filename") lonely_duration_file = at + filename.setResultsName("filename") # timespecs ::= timestamp [duration_file | {timestamp}] # If duration_file timestamp is lonely, prepend a zero timestamp. timespecs = Or( [lonely_duration_file.setParseAction( lambda s, l, t: [timestamp.parseString("00:00:00.000"), t]), Group(timestamp) + duration_file, OneOrMore(Group(timestamp.setParseAction(default_timestamp_fields)))]) # last_frame ::= "-1" | "last" last_frame = oneOf(["-1", "last"]).setParseAction(replaceWith(-1)) # frame_number ::= ":" (zero_index | last_frame) frame_number = colon - (zero_index | last_frame).setResultsName("num") # stream_number ::= ":" zero_index stream_number = colon - zero_index.setResultsName("num") # input_file ::= ":" [filename] input_file = colon - Optional(filename).setResultsName("filename") # previous_segment ::= ":" "^" previous_segment = colon - caret.setResultsName("filename") # frame_input_file ::= input_file | previous_segment frame_input_file = Or([input_file, previous_segment]) # av_trailer ::= input_file [stream_number] av_trailer = input_file + Optional(stream_number) # frame_type ::= "frame" | "f" frame_type = oneOf(["f", "frame"]).setParseAction(replaceWith("frame")) # frame_input ::= frame_type [frame_input_file [frame_number]] frame_input = (frame_type.setResultsName("type") + Optional(frame_input_file + Optional(frame_number))) # video_type ::= "video" | "v" video_type = oneOf(["v", "video"]).setParseAction(replaceWith("video")) # audio_type ::= "audio" | "a" audio_type = oneOf(["a", "audio"]).setParseAction(replaceWith("audio")) # av_input ::= (audio_type | video_type) [av_trailer] av_input = ((audio_type | video_type).setResultsName("type") + Optional(av_trailer)) # inputspec ::= "[" (av_input | frame_input) "]" inputspec = (left_bracket + delimitedList(av_input | frame_input, delim=":") .setParseAction(default_input_fields) - right_bracket) # segmentspec ::= inputspec [timespecs] segmentspec = Group(inputspec + Group(Optional(timespecs)).setResultsName("times")) # config ::= {segmentspec} config = ZeroOrMore(segmentspec) config.ignore(pythonStyleComment) return config def parse_configuration_file(config_file): """Parse a podcast configuration file.""" try: parser = parser_bnf() result = parser.parseFile(config_file, parseAll=True) except (ParseException, ParseSyntaxException) as e: print("ERROR: {m}".format(m=str(e))) sys.exit(1) return result def parse_configuration_string(config_string): """Parse a podcast configuration file.""" try: parser = parser_bnf() result = parser.parseString(config_string, parseAll=True) except (ParseException, ParseSyntaxException) as e: print("ERROR: {m}".format(m=str(e))) sys.exit(1) return result def test_parser(): tests = ["test/config1.txt", "test/config2.txt", "test/config3.txt", "test/config4.txt", "test/config5.txt"] for t in tests: print("==={f}===".format(f=t)) r = parse_configuration_file(t) for s in r: print(s) print(" type = {t}".format(t=s["type"])) print(" filename = '{f}'".format(f=s["filename"])) print(" num = {n}".format(n=s["num"])) print(" times = {t}".format(t=s["times"])) for i, t in enumerate(s["times"]): if (isinstance(t, str)): print(" punch out after duration of '{f}'".format(f=t)) if (isinstance(t, ParseResults)): if (i % 2 == 0): print(" punch in at: {hh:02d}:{mm:02d}:{ss:02d}.{ms:03d}".format(hh=t["hh"], mm=t["mm"], ss=t["ss"], ms=t["ms"])) else: print(" punch out at: {hh:02d}:{mm:02d}:{ss:02d}.{ms:03d}".format(hh=t["hh"], mm=t["mm"], ss=t["ss"], ms=t["ms"])) print() if (__name__ == "__main__"): test_parser()
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