mirror of https://git.sr.ht/~rabbits/modal
Updated python source
This commit is contained in:
Devine Lu Linvega
parent
77655f3b7f
commit
8b79c3007b
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@ -0,0 +1,11 @@
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define (M ?x) (?x ?x)
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define (KI ?x ?y) (?y)
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define (T ?x ?y) (?y ?y)
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define (W ?x ?y) (?x ?y ?y)
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define (K ?x ?y) (?x)
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define (C ?x ?y ?z) (?x ?z ?y)
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define (B ?x ?y ?z) (?x (?y ?z))
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define (I ?x) (?x)
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define (S ?x ?y ?z) (?x ?z (?y ?z))
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386
modal.py
386
modal.py
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@ -7,344 +7,341 @@
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|is based on the idea of cyclic delimited string rewriting |
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|using a central queue and a dictionary of variable bindings.|
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| |
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|© 2019 imode, Immediate Mode Technologies |
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|© 2019-2024 wryl, Paradigital |
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*------------------------------------------------------------*
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"""
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# `sys` for I/O and arguments.
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# `time` for measuring the runtime of the interpreter.
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import sys, time;
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import sys, time
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# A decorator intended for measuring the runtime of a given function.
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def measure(function):
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def measurement(*arguments):
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start = time.time();
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result = function(*arguments);
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end = time.time();
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milliseconds = (end - start) * 1000.0;
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start = time.time()
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result = function(*arguments)
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end = time.time()
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milliseconds = (end - start) * 1000.0
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print("\nTook {:.3f}ms".format(milliseconds))
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return result;
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return measurement;
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return result
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return measurement
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# Enqueue an item by appending it to the queue.
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def enqueue(queue, item):
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return queue + item;
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return queue + item
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# Dequeue an item by slicing the queue. The last item is the head.
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def dequeue(queue, length=1):
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if length > len(queue):
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return queue;
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return queue[length:];
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return queue
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return queue[length:]
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# Get the item(s) at the head of the queue.
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def peek(queue, length=1):
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if length > len(queue):
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return None;
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return None
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if length == 1:
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return queue[0];
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return queue[:length];
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return queue[0]
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return queue[:length]
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# Roll/cycle the queue by a certain amount by slicing.
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# This dequeues and enqueues a number of items, "cycling" the queue.
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def roll(queue, length=1):
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if length > len(queue):
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return queue;
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return queue[length:] + queue[:length];
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return queue
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return queue[length:] + queue[:length]
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# Seek to a certain position in the queue by repeatedly rolling it.
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def seek(queue, pattern):
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if pattern not in queue:
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return queue;
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return queue
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while peek(queue, len(pattern)) != pattern:
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queue = roll(queue);
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return queue;
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queue = roll(queue)
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return queue
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# Extract a delimited fragment (subtree) from the queue.
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def extract(queue):
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results = [];
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depth = 0;
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results = []
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depth = 0
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for element in queue:
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if element[0] == "SRT":
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return [];
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return []
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if element[0] == "INC":
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depth = depth + 1;
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depth = depth + 1
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if element[0] == "DEC":
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if depth == 0:
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return results;
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depth = depth - 1;
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results.append(element);
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return results
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depth = depth - 1
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results.append(element)
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if depth == 0:
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return results;
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return results;
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return results
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return results
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# Generate a list of variable bindings from the current queue and a pattern.
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def match(pattern, queue, context=None):
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if context == None:
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context = {};
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context = {}
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if peek(queue) == None:
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return context;
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return context
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for element in pattern:
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if element[0] == "VAR":
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variable = element[1];
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value = extract(queue);
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variable = element[1]
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value = extract(queue)
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if variable in context:
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if context[variable] != value:
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return None;
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queue = dequeue(queue, len(context[variable]));
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return None
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queue = dequeue(queue, len(context[variable]))
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else:
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if len(value) == 0:
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return None;
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context[variable] = value;
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queue = dequeue(queue, len(context[variable]));
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return None
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context[variable] = value
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queue = dequeue(queue, len(context[variable]))
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elif element != peek(queue):
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return None;
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return None
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else:
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queue = dequeue(queue);
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return context;
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queue = dequeue(queue)
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return context
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# Fill in a pattern with variables in it using a list of variable bindings.
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def construct(pattern, context):
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results = [];
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results = []
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for element in pattern:
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if element[0] == "VAR":
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if element[1] in context:
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for element in context[element[1]]:
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results.append(element);
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results.append(element)
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else:
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results.append(element);
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results.append(element)
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else:
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results.append(element);
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return results;
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results.append(element)
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return results
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# Apply a pattern/replacement rule to the queue.
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def apply(queue, rules, pattern, replacement):
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context = match(pattern, queue);
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context = match(pattern, queue)
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if context == None:
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return (False, roll(queue));
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pattern = construct(pattern, context);
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return (False, roll(queue))
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pattern = construct(pattern, context)
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if not pattern:
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return (False, roll(queue));
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replacement = construct(replacement, context);
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if len(replacement) == 0:
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return (True, dequeue(queue, len(pattern)))
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return (False, roll(queue))
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replacement = construct(replacement, context)
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if not replacement:
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return (True, roll(queue));
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return (True, enqueue(dequeue(queue, len(pattern)), replacement));
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return (False, roll(queue))
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return (True, enqueue(dequeue(queue, len(pattern)), replacement))
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def define(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if right and left:
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if len(left) > 1:
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left = left[1:][:-1];
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left = left[1:][:-1]
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if len(right) > 1:
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right = right[1:][:-1];
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rules.append((left, apply, [right]));
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return (True, dequeue(queue, len(construct(pattern, context))));
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return (False, roll(queue));
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right = right[1:][:-1]
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rules.append((left, apply, [right]))
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return (True, dequeue(queue, len(construct(pattern, context))))
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return (False, roll(queue))
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def undefine(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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context = match(pattern, queue)
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left = context["left"]
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if left:
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if len(left) > 1:
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left = left[1:][:-1];
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left = left[1:][:-1]
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for rule, index in zip(rules, range(0, len(rules))):
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candidate , _, _ = rule;
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candidate , _, _ = rule
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if candidate == left:
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del rules[index];
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return (True, dequeue(queue, len(construct(pattern, context))));
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return (False, roll(queue));
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del rules[index]
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return (True, dequeue(queue, len(construct(pattern, context))))
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return (False, roll(queue))
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def add(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if left and right:
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if left[0][0] == "NUM" and right[0][0] == "NUM":
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queue = dequeue(queue, len(construct(pattern, context)));
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queue = enqueue(queue, parse(str(left[0][1] + right[0][1])));
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return (True, queue);
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return (False, roll(queue));
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queue = dequeue(queue, len(construct(pattern, context)))
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queue = enqueue(queue, parse(str(left[0][1] + right[0][1])))
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return (True, queue)
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return (False, roll(queue))
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def subtract(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if left and right:
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if left[0][0] == "NUM" and right[0][0] == "NUM":
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queue = dequeue(queue, len(construct(pattern, context)));
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queue = enqueue(queue, parse(str(left[0][1] - right[0][1])));
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return (True, queue);
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return (False, roll(queue));
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queue = dequeue(queue, len(construct(pattern, context)))
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queue = enqueue(queue, parse(str(left[0][1] - right[0][1])))
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return (True, queue)
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return (False, roll(queue))
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def multiply(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if left and right:
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if left[0][0] == "NUM" and right[0][0] == "NUM":
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queue = dequeue(queue, len(construct(pattern, context)));
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queue = enqueue(queue, parse(str(left[0][1] * right[0][1])));
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return (True, queue);
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return (False, roll(queue));
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queue = dequeue(queue, len(construct(pattern, context)))
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queue = enqueue(queue, parse(str(left[0][1] * right[0][1])))
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return (True, queue)
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return (False, roll(queue))
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def divide(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if left and right:
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if left[0][0] == "NUM" and right[0][0] == "NUM":
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queue = dequeue(queue, len(construct(pattern, context)));
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queue = enqueue(queue, parse(str(left[0][1] // right[0][1])));
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return (True, queue);
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return (False, roll(queue));
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queue = dequeue(queue, len(construct(pattern, context)))
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queue = enqueue(queue, parse(str(left[0][1] // right[0][1])))
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return (True, queue)
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return (False, roll(queue))
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def modulo(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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right = context["right"];
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context = match(pattern, queue)
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left = context["left"]
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right = context["right"]
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if left and right:
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if left[0][0] == "NUM" and right[0][0] == "NUM":
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queue = dequeue(queue, len(construct(pattern, context)));
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queue = enqueue(queue, parse(str(left[0][1] % right[0][1])));
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return (True, queue);
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return (False, roll(queue));
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queue = dequeue(queue, len(construct(pattern, context)))
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queue = enqueue(queue, parse(str(left[0][1] % right[0][1])))
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return (True, queue)
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return (False, roll(queue))
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def display(queue, rules, pattern):
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context = match(pattern, queue);
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left = context["left"];
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context = match(pattern, queue)
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left = context["left"]
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if left:
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if left[0][0] == "LIT" or left[0][0] == "NUM":
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if left[0][1] == "space":
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print(' ', end="");
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print(' ', end="")
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elif left[0][1] == "newline":
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print('\n', end="");
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print('\n', end="")
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elif left[0][1] == "tab":
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print('\t', end="");
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print('\t', end="")
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else:
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print(left[0][1], end="");
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return (True, dequeue(queue, len(construct(pattern, context))));
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return (False, roll(queue));
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print(left[0][1], end="")
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return (True, dequeue(queue, len(construct(pattern, context))))
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return (False, roll(queue))
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def applicable(rules, queue):
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results = [];
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results = []
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for pattern, operation, parameters in rules:
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if match(pattern, queue) != None:
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results.append((pattern, operation, parameters));
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return results;
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results.append((pattern, operation, parameters))
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return results
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def pick(list):
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if len(list) == 0:
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return None;
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return list[0];
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return None
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return list[0]
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def reconstruct(pattern):
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for element in pattern:
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if element[0] == "INC":
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yield '(';
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yield '('
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elif element[0] == "DEC":
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yield ')';
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yield ')'
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elif element[0] == "NUM":
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yield str(element[1]);
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yield str(element[1])
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elif element[0] == "LIT":
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yield element[1];
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yield element[1]
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elif element[0] == "VAR":
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yield '?' + element[1];
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yield ' ';
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yield '?' + element[1]
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yield ' '
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def number(string):
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try:
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result = int(string);
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return True;
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result = int(string)
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return True
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except:
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return False;
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return False
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def literal(string, index=0):
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token = "";
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token = ""
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while index != len(string):
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character = string[index];
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character = string[index]
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if character in ['(', ')', '{', '}', '[', ']', '?', ' ', '\t', '\n', '\r']:
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break;
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break
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else:
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token = token + string[index];
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index = index + 1;
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return (token, index);
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token = token + string[index]
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index = index + 1
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return (token, index)
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def parse(string, index=0):
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results = [];
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results = []
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while index != len(string):
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character = string[index];
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character = string[index]
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if character in ['(', ')', '{', '}', '[', ']', '?', ' ', '\t', '\n', '\r']:
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index = index + 1;
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index = index + 1
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if character in ['(', '{', '[']:
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results.append(["INC"]);
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results.append(["INC"])
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elif character in [')', '}', ']']:
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results.append(["DEC"]);
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results.append(["DEC"])
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elif character not in [' ', '\t', '\n', '\r']:
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token, index = literal(string, index);
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token, index = literal(string, index)
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if character == '?':
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results.append(["VAR", token]);
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results.append(["VAR", token])
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elif number(token):
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results.append(["NUM", int(token)]);
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results.append(["NUM", int(token)])
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else:
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results.append(["LIT", token]);
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return results;
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results.append(["LIT", token])
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return results
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@measure
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def run(rules, queue, limit=pow(2, 32)):
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steps = 0;
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failures = 0;
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queue = [["SRT"]] + queue;
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steps = 0
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failures = 0
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queue = [["SRT"]] + queue
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while failures != len(queue) and steps != limit:
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rule = pick(applicable(rules, queue));
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rule = pick(applicable(rules, queue))
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if rule == None:
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queue = roll(queue);
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failures = failures + 1;
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print("<>: ", inspect(queue))
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queue = roll(queue)
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failures = failures + 1
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else:
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pattern, operation, parameters = rule;
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result, queue = operation(queue, rules, pattern, *parameters);
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pattern, operation, parameters = rule
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result, queue = operation(queue, rules, pattern, *parameters)
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if result == True:
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failures = 0;
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#print("<>: ", inspect(seek(queue, ["SRT"])), ":::", inspect(pattern))
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print("<>: ", inspect(queue), ":::", inspect(pattern))
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failures = 0
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#print("<>: ", inspect(seek(queue, ["SRT"])))
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#print("<>: ", inspect(queue))
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#input()
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steps = steps + 1;
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steps = steps + 1
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if steps == limit:
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print("Execution limit reached.");
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return queue;
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print("Execution limit reached.")
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return queue
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def read(file):
|
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try:
|
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with open(file) as file:
|
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content = file.read();
|
||||
return content;
|
||||
content = file.read()
|
||||
return content
|
||||
except EnvironmentError:
|
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return None;
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return None
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def inspect(pattern):
|
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return "".join(reconstruct(pattern));
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return "".join(reconstruct(pattern))
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|
||||
def usage(name):
|
||||
print(name + ':', "a programming language based on rewriting.");
|
||||
print("Usage:");
|
||||
print((' ' * 4) + name, "<file>");
|
||||
print(name + ':', "a programming language based on rewriting.")
|
||||
print("Usage:")
|
||||
print((' ' * 4) + name, "<file>")
|
||||
|
||||
def prompt(prompt):
|
||||
try:
|
||||
return input(prompt);
|
||||
return input(prompt)
|
||||
except:
|
||||
return None;
|
||||
return None
|
||||
|
||||
def help():
|
||||
prefix = ' ' * 4;
|
||||
print("Commands:");
|
||||
print(prefix + "rules : Display the current ruleset.");
|
||||
print(prefix + "clear : Clear the current ruleset.");
|
||||
print(prefix + "help : This message.");
|
||||
print(prefix + "quit : Quit.");
|
||||
prefix = ' ' * 4
|
||||
print("Commands:")
|
||||
print(prefix + "rules : Display the current ruleset.")
|
||||
print(prefix + "clear : Clear the current ruleset.")
|
||||
print(prefix + "help : This message.")
|
||||
print(prefix + "quit : Quit.")
|
||||
|
||||
def main():
|
||||
defaults = [
|
||||
|
|
@ -385,37 +382,40 @@ def main():
|
|||
(parse("?left / ?right"), divide, []),
|
||||
(parse("?left % ?right"), modulo, []),
|
||||
(parse("display ?left"), display, []),
|
||||
];
|
||||
rules = defaults;
|
||||
]
|
||||
rules = defaults.copy()
|
||||
if len(sys.argv) >= 2:
|
||||
content = read(sys.argv[1]);
|
||||
content = read(sys.argv[1])
|
||||
if content == None:
|
||||
print("No such file.");
|
||||
return;
|
||||
print("Initializating...");
|
||||
run(rules, parse(content));
|
||||
print("Modal v0.02");
|
||||
help();
|
||||
print("No such file.")
|
||||
return
|
||||
print("Initializating...")
|
||||
run(rules, parse(content))
|
||||
else:
|
||||
usage(sys.argv[0])
|
||||
return
|
||||
print("Modal v0.02")
|
||||
help()
|
||||
while True:
|
||||
input = prompt("::> ");
|
||||
input = prompt("::> ")
|
||||
if input == None:
|
||||
break;
|
||||
break
|
||||
elif parse(input) == parse("rules"):
|
||||
print("Rules:");
|
||||
prefix = ' ' * 4;
|
||||
print("Rules:")
|
||||
prefix = ' ' * 4
|
||||
for pattern, operation, parameters in rules:
|
||||
if operation == apply:
|
||||
print(prefix + inspect(pattern) + "-> " + inspect(parameters[0]));
|
||||
print(prefix + inspect(pattern) + "-> " + inspect(parameters[0]))
|
||||
elif parse(input) == parse("clear"):
|
||||
rules = defaults;
|
||||
rules = defaults
|
||||
elif parse(input) == parse("help"):
|
||||
help();
|
||||
help()
|
||||
elif parse(input) == parse("quit") or parse(input) == parse("exit"):
|
||||
break;
|
||||
break
|
||||
else:
|
||||
print("Reducing...");
|
||||
print(inspect(seek(run(rules, parse(input)), ["SRT"])));
|
||||
return;
|
||||
print("Reducing...")
|
||||
print(inspect(seek(run(rules, parse(input)), ["SRT"])))
|
||||
return
|
||||
|
||||
if __name__ == "__main__":
|
||||
main();
|
||||
main()
|
||||
|
|
|
|||
|
|
@ -0,0 +1,4 @@
|
|||
define nil ((0))
|
||||
define (cons ?x (?y)) ((?x ?y))
|
||||
define (car (?x)) ?x
|
||||
|
||||
Loading…
Reference in New Issue