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usr / share / doc / python-ply-3.4 / example / BASIC /

📁 ..
📄 README(2.45 KB)
📄 basic.py(1.5 KB)
📄 basiclex.py(1.15 KB)
📄 basiclog.py(1.65 KB)
📄 basinterp.py(16.88 KB)
📄 basparse.py(8.69 KB)
📄 dim.bas(224 B)
📄 func.bas(73 B)
📄 gcd.bas(359 B)
📄 gosub.bas(216 B)
📄 hello.bas(57 B)
📄 linear.bas(420 B)
📄 maxsin.bas(217 B)
📄 powers.bas(268 B)
📄 rand.bas(60 B)
📄 sales.bas(375 B)
📄 sears.bas(481 B)
📄 sqrt1.bas(78 B)
📄 sqrt2.bas(56 B)

Editing: basiclog.py

# An implementation of Dartmouth BASIC (1964)
#

import sys
sys.path.insert(0,"../..")

if sys.version_info[0] >= 3:
    raw_input = input

import logging
logging.basicConfig(
    level = logging.INFO,
    filename = "parselog.txt",
    filemode = "w"
)
log = logging.getLogger()

import basiclex
import basparse
import basinterp

# If a filename has been specified, we try to run it.
# If a runtime error occurs, we bail out and enter
# interactive mode below
if len(sys.argv) == 2:
    data = open(sys.argv[1]).read()
    prog = basparse.parse(data,debug=log)
    if not prog: raise SystemExit
    b = basinterp.BasicInterpreter(prog)
    try:
        b.run()
        raise SystemExit
    except RuntimeError:
        pass

else:
    b = basinterp.BasicInterpreter({})

# Interactive mode.  This incrementally adds/deletes statements
# from the program stored in the BasicInterpreter object.  In
# addition, special commands 'NEW','LIST',and 'RUN' are added.
# Specifying a line number with no code deletes that line from
# the program.

while 1:
    try:
        line = raw_input("[BASIC] ")
    except EOFError:
        raise SystemExit
    if not line: continue
    line += "\n"
    prog = basparse.parse(line,debug=log)
    if not prog: continue

keys = list(prog)
    if keys[0] > 0:
         b.add_statements(prog)
    else:
         stat = prog[keys[0]]
         if stat[0] == 'RUN':
             try:
                 b.run()
             except RuntimeError:
                 pass
         elif stat[0] == 'LIST':
             b.list()
         elif stat[0] == 'BLANK':
             b.del_line(stat[1])
         elif stat[0] == 'NEW':
             b.new()

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Editing: basiclog.py

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