80 lines
1.7 KiB
Python
80 lines
1.7 KiB
Python
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# An implementation of Dartmouth BASIC (1964)
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#
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import sys
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sys.path.insert(0,"../..")
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if sys.version_info[0] >= 3:
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raw_input = input
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import logging
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logging.basicConfig(
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level = logging.INFO,
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filename = "parselog.txt",
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filemode = "w"
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)
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log = logging.getLogger()
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import basiclex
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import basparse
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import basinterp
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# If a filename has been specified, we try to run it.
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# If a runtime error occurs, we bail out and enter
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# interactive mode below
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if len(sys.argv) == 2:
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data = open(sys.argv[1]).read()
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prog = basparse.parse(data,debug=log)
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if not prog: raise SystemExit
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b = basinterp.BasicInterpreter(prog)
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try:
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b.run()
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raise SystemExit
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except RuntimeError:
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pass
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else:
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b = basinterp.BasicInterpreter({})
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# Interactive mode. This incrementally adds/deletes statements
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# from the program stored in the BasicInterpreter object. In
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# addition, special commands 'NEW','LIST',and 'RUN' are added.
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# Specifying a line number with no code deletes that line from
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# the program.
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while 1:
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try:
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line = raw_input("[BASIC] ")
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except EOFError:
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raise SystemExit
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if not line: continue
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line += "\n"
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prog = basparse.parse(line,debug=log)
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if not prog: continue
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keys = list(prog)
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if keys[0] > 0:
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b.add_statements(prog)
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else:
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stat = prog[keys[0]]
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if stat[0] == 'RUN':
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try:
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b.run()
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except RuntimeError:
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pass
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elif stat[0] == 'LIST':
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b.list()
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elif stat[0] == 'BLANK':
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b.del_line(stat[1])
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elif stat[0] == 'NEW':
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b.new()
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