128 lines
2.8 KiB
Python
128 lines
2.8 KiB
Python
import operator as op
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from functools import reduce
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import traces
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from lenses import bind
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import stl.ast
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from stl.ast import (And, F, G, Interval, LinEq, Neg, Or, AP_lens)
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from stl.types import STL
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oo = float('inf')
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def f_neg_or_canonical_form(phi: STL) -> STL:
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if isinstance(phi, LinEq):
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return phi
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children = [f_neg_or_canonical_form(s) for s in phi.children]
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if isinstance(phi, (And, G)):
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children = [Neg(s) for s in children]
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children = tuple(children)
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if isinstance(phi, Or):
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return Or(children)
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elif isinstance(phi, And):
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return Neg(Or(children))
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elif isinstance(phi, Neg):
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return Neg(children[0])
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elif isinstance(phi, F):
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return F(phi.interval, children[0])
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elif isinstance(phi, G):
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return Neg(F(phi.interval, children[0]))
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else:
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raise NotImplementedError
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def _lineq_lipschitz(lineq):
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return sum(map(abs, bind(lineq).Each().terms.Each().coeff.collect()))
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def linear_stl_lipschitz(phi):
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"""Infinity norm lipschitz bound of linear inequality predicate."""
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return float(max(map(_lineq_lipschitz, phi.lineqs)))
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def inline_context(phi, context):
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phi2 = None
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def update(ap):
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return context.get(ap, ap)
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while phi2 != phi:
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phi2, phi = phi, AP_lens(phi).modify(update)
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# TODO: this is hack to flatten the AST. Fix!
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return stl.parse(str(phi))
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op_lookup = {
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">": op.gt,
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">=": op.ge,
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"<": op.lt,
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"<=": op.le,
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"=": op.eq,
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}
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def get_times(x):
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times = set.union(*({t for t, _ in v.items()} for v in x.values()))
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return sorted(times)
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def const_trace(x, start=0):
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return traces.TimeSeries([(start, x)], domain=traces.Domain(start, oo))
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def eval_lineq(lineq, x, domain, compact=True):
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lhs = sum(const_trace(term.coeff)*x[term.id] for term in lineq.terms)
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compare = op_lookup.get(lineq.op)
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output = lhs.operation(const_trace(lineq.const), compare)
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output.domain = domain
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if compact:
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output.compact()
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return output
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def eval_lineqs(phi, x):
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lineqs = phi.lineqs
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start = max(y.domain.start() for y in x.values())
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end = min(y.domain.end() for y in x.values())
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domain = traces.Domain(start, end)
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return {lineq: eval_lineq(lineq, x, domain) for lineq in lineqs}
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# EDSL
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def alw(phi, *, lo=0, hi=float('inf')):
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return G(Interval(lo, hi), phi)
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def env(phi, *, lo=0, hi=float('inf')):
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return F(Interval(lo, hi), phi)
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def andf(*args):
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return reduce(op.and_, args) if args else stl.TOP
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def orf(*args):
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return reduce(op.or_, args) if args else stl.TOP
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def implies(x, y):
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return ~x | y
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def xor(x, y):
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return (x | y) & ~(x & y)
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def iff(x, y):
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return (x & y) | (~x & ~y)
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def timed_until(phi, psi, lo, hi):
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return env(psi, lo=lo, hi=hi) & alw(stl.ast.Until(phi, psi), lo=0, hi=lo)
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