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‎02-array-seq/lispy/LICENSE‎

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MIT License
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Copyright (c) 2010-2017 Peter Norvig
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎02-array-seq/lispy/README.md‎

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# Norvig's originals and updates
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This directory contains:
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* `original/`:
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Norvig's [`lis.py`](https://github.com/norvig/pytudes/blob/c33cd6835a506a57d9fe73e3a8317d49babb13e8/py/lis.py),
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[`lispy.py`](https://github.com/norvig/pytudes/blob/c33cd6835a506a57d9fe73e3a8317d49babb13e8/py/lispy.py), and the `lispytest.py` custom test script for testing both;
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* `py3.10/`: `lis.py` with type hints, pattern matching, and minor edits—requires Python 3.10.
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The `py3.10/` directory also has `lis_test.py` to run with
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[pytest](https://docs.pytest.org), including all the
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[`lis_tests` suite](https://github.com/norvig/pytudes/blob/60168bce8cdfacf57c92a5b2979f0b2e95367753/py/lispytest.py#L5)
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from `original/lispytest.py`,
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and additional separate tests for each expression and special form handled by `evaluate`.
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## Provenance, Copyright and License
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`lis.py` is
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[published](https://github.com/norvig/pytudes/blob/c33cd6835a506a57d9fe73e3a8317d49babb13e8/py/lis.py)
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in the [norvig/pytudes](https://github.com/norvig/pytudes) repository on Github.
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The copyright holder is Peter Norvig and the code is licensed under the
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[MIT license](https://github.com/norvig/pytudes/blob/60168bce8cdfacf57c92a5b2979f0b2e95367753/LICENSE).
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## Changes to Norvig's code
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I made small changes to the programs in `original/`:
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* In `lis.py`:
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* The `Procedure` class accepts a list of expressions as the `body`, and `__call__` evaluates all those expressions in order, returning the value of the last. This is consistent with Scheme's `lambda` syntax and provided a useful example for pattern matching.
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* In the `elif` block for `'lambda'`, I added the `*` in front of the `*body` variable in the tuple unpacking to capture the expressions as a list, before calling the `Procedure` constructor.
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* In `lispy.py` I made [changes and a pull request](https://github.com/norvig/pytudes/pull/106) to make it run on Python 3.
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_Luciano Ramalho<br/>June 29, 2021_

‎02-array-seq/lispy/original/LICENSE‎

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MIT License
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Copyright (c) 2010-2017 Peter Norvig
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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# Source of the originals
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* [lis.py](https://raw.githubusercontent.com/norvig/pytudes/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lis.py)
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* [lispy.py](https://raw.githubusercontent.com/norvig/pytudes/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispy.py)
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* [lispytest.py](https://raw.githubusercontent.com/norvig/pytudes/705c0a335c1811a203e79587d7d41865cf7f41c7/py/lispytest.py)

‎02-array-seq/lispy/original/lis.py‎

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################ Lispy: Scheme Interpreter in Python 3.3+
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## (c) Peter Norvig, 2010-18; See http://norvig.com/lispy.html
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################ Imports and Types
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import math
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import operator as op
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from collections import ChainMap as Environment
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Symbol = str # A Lisp Symbol is implemented as a Python str
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List = list # A Lisp List is implemented as a Python list
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Number = (int, float) # A Lisp Number is implemented as a Python int or float
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class Procedure(object):
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"A user-defined Scheme procedure."
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def __init__(self, parms, body, env):
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self.parms, self.body, self.env = parms, body, env
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def __call__(self, *args):
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env = Environment(dict(zip(self.parms, args)), self.env)
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return eval(self.body, env)
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################ Global Environment
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def standard_env():
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"An environment with some Scheme standard procedures."
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env = {}
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env.update(vars(math)) # sin, cos, sqrt, pi, ...
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env.update({
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'+':op.add, '-':op.sub, '*':op.mul, '/':op.truediv,
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'>':op.gt, '<':op.lt, '>=':op.ge, '<=':op.le, '=':op.eq,
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'abs': abs,
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'append': op.add,
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'apply': lambda proc, args: proc(*args),
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'begin': lambda *x: x[-1],
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'car': lambda x: x[0],
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'cdr': lambda x: x[1:],
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'cons': lambda x,y: [x] + y,
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'eq?': op.is_,
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'equal?': op.eq,
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'length': len,
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'list': lambda *x: list(x),
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'list?': lambda x: isinstance(x,list),
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'map': lambda *args: list(map(*args)),
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'max': max,
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'min': min,
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'not': op.not_,
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'null?': lambda x: x == [],
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'number?': lambda x: isinstance(x, Number),
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'procedure?': callable,
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'round': round,
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'symbol?': lambda x: isinstance(x, Symbol),
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})
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return env
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global_env = standard_env()
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################ Parsing: parse, tokenize, and read_from_tokens
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def parse(program):
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"Read a Scheme expression from a string."
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return read_from_tokens(tokenize(program))
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def tokenize(s):
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"Convert a string into a list of tokens."
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return s.replace('(',' ( ').replace(')',' ) ').split()
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def read_from_tokens(tokens):
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"Read an expression from a sequence of tokens."
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if len(tokens) == 0:
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raise SyntaxError('unexpected EOF while reading')
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token = tokens.pop(0)
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if '(' == token:
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L = []
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while tokens[0] != ')':
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L.append(read_from_tokens(tokens))
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tokens.pop(0) # pop off ')'
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return L
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elif ')' == token:
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raise SyntaxError('unexpected )')
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else:
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return atom(token)
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def atom(token):
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"Numbers become numbers; every other token is a symbol."
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try: return int(token)
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except ValueError:
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try: return float(token)
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except ValueError:
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return Symbol(token)
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################ Interaction: A REPL
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def repl(prompt='lis.py> '):
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"A prompt-read-eval-print loop."
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while True:
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val = eval(parse(input(prompt)))
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if val is not None:
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print(lispstr(val))
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def lispstr(exp):
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"Convert a Python object back into a Lisp-readable string."
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if isinstance(exp, List):
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return '(' + ' '.join(map(lispstr, exp)) + ')'
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else:
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return str(exp)
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################ eval
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def eval(x, env=global_env):
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"Evaluate an expression in an environment."
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if isinstance(x, Symbol): # variable reference
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return env[x]
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elif not isinstance(x, List): # constant literal
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return x
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elif x[0] == 'quote': # (quote exp)
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(_, exp) = x
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return exp
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elif x[0] == 'if': # (if test conseq alt)
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(_, test, conseq, alt) = x
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exp = (conseq if eval(test, env) else alt)
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return eval(exp, env)
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elif x[0] == 'define': # (define var exp)
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(_, var, exp) = x
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env[var] = eval(exp, env)
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elif x[0] == 'lambda': # (lambda (var...) body)
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(_, parms, body) = x
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return Procedure(parms, body, env)
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else: # (proc arg...)
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proc = eval(x[0], env)
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args = [eval(exp, env) for exp in x[1:]]
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return proc(*args)

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