word: implement twa word parsing
* spot/twaalgos/word.hh: add parse_word method and a new constructor * spot/twaalgos/word.cc: implement word parsing * python/spot/__init__.py: add parse_word method binding * tests/python/word.ipynb: add word parsing tests
This commit is contained in:
Amaury Fauchille
Alexandre Duret-Lutz
parent
61b1f200b6
commit
1fd76ee918
4 changed files with 393 additions and 7 deletions
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@ -860,3 +860,7 @@ def sat_minimize(aut, acc=None, colored=False,
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args += ',dichotomy';
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from spot.impl import sat_minimize as sm
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return sm(aut, args, state_based)
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def parse_word(word, dic=_bdd_dict):
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from spot.impl import parse_word as pw
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return pw(word, dic)
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@ -1,6 +1,6 @@
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// -*- coding: utf-8 -*-
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// Copyright (C) 2013, 2014, 2015 Laboratoire de Recherche et Développement
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// de l'Epita (LRDE).
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// Copyright (C) 2013, 2014, 2015, 2016 Laboratoire de Recherche et
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// Développement de l'Epita (LRDE).
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//
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// This file is part of Spot, a model checking library.
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//
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@ -20,10 +20,13 @@
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#include <spot/twaalgos/word.hh>
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#include <spot/twa/bddprint.hh>
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#include <spot/twa/bdddict.hh>
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#include <spot/tl/parse.hh>
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#include <spot/tl/simplify.hh>
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#include <spot/tl/apcollect.hh>
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namespace spot
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{
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twa_word::twa_word(const twa_run_ptr run)
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twa_word::twa_word(const twa_run_ptr& run)
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: dict_(run->aut->get_dict())
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{
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for (auto& i: run->prefix)
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@ -33,6 +36,11 @@ namespace spot
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dict_->register_all_variables_of(run->aut, this);
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}
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twa_word::twa_word(const bdd_dict_ptr& dict)
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: dict_(dict)
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{
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}
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void
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twa_word::simplify()
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{
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@ -105,4 +113,143 @@ namespace spot
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os << '}';
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return os;
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}
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namespace
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{
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static void word_parse_error(const std::string& word,
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size_t i, parse_error_list pel)
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{
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for (auto& err: pel)
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{
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err.first.begin.column += i;
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err.first.end.column += i;
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}
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std::ostringstream os;
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format_parse_errors(os, word, pel);
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throw parse_error(os.str());
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}
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static void word_parse_error(const std::string& word, size_t i,
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const std::string& message)
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{
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if (i == std::string::npos)
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i = word.size();
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std::ostringstream s;
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s << ">>> " << word << '\n';
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for (auto j = i + 4; j > 0; --j)
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s << ' ';
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s << '^' << '\n';
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s << message << '\n';
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throw parse_error(s.str());
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}
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static size_t skip_next_formula(const std::string& word, size_t begin)
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{
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bool quoted = false;
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auto size = word.size();
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for (auto j = begin; j < size; ++j)
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{
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auto c = word[j];
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if (!quoted && (c == ';' || c == '}'))
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return j;
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if (c == '"')
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quoted = !quoted;
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else if (quoted && c == '\\')
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++j;
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}
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if (quoted)
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word_parse_error(word, word.size(), "Unclosed string");
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return std::string::npos;
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}
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}
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twa_word_ptr parse_word(const std::string& word, const bdd_dict_ptr& dict)
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{
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atomic_prop_set aps;
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parse_error_list pel;
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tl_simplifier tls(dict);
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twa_word_ptr tw = make_twa_word(dict);
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size_t i = 0;
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auto ind = i;
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auto extract_bdd =
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[&](typename twa_word::seq_t& seq)
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{
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auto sub = word.substr(i, ind - i);
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formula f = spot::parse_infix_boolean(sub, pel);
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if (!pel.empty())
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word_parse_error(word, i, pel);
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atomic_prop_collect(f, &aps);
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seq.push_back(tls.as_bdd(f));
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if (word[ind] == '}')
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return true;
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// Skip blanks after semi-colon
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i = word.find_first_not_of(' ', ind + 1);
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return false;
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};
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// Parse the prefix part. Can be empty.
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while (word.substr(i, 6) != std::string("cycle{"))
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{
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ind = skip_next_formula(word, i);
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if (ind == std::string::npos)
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word_parse_error(word, word.size(),
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"A twa_word must contain a cycle");
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if (word[ind] == '}')
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word_parse_error(word, ind, "Expected ';' delimiter :"
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"'}' stands for ending a cycle");
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// Exract formula, convert it to bdd and add it to the prefix sequence
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extract_bdd(tw->prefix);
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if (i == std::string::npos)
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word_parse_error(word, ind + 1, "Missing cycle in formula");
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}
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// Consume "cycle{"
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i += 6;
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while (true)
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{
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ind = skip_next_formula(word, i);
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if (ind == std::string::npos)
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word_parse_error(word, word.size(),
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"Missing ';' or '}' after formula");
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// Extract formula, convert it to bdd and add it to the cycle sequence
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// Break if an '}' is encountered
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if (extract_bdd(tw->cycle))
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break;
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if (i == std::string::npos)
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word_parse_error(word, ind + 1,
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"Missing end of cycle character : '}'");
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}
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if (ind != word.size() - 1)
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word_parse_error(word, ind + 1, "Input should be finished after cycle");
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for (auto ap: aps)
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dict->register_proposition(ap, tw.get());
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return tw;
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}
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twa_graph_ptr twa_word::as_automaton() const
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{
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twa_graph_ptr aut = make_twa_graph(dict_);
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aut->prop_weak(true);
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aut->prop_deterministic(true);
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size_t i = 0;
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aut->new_states(prefix.size() + cycle.size());
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for (auto b: prefix)
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{
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aut->new_edge(i, i + 1, b);
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++i;
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}
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size_t j = i;
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auto b = cycle.begin();
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auto end = --cycle.end();
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for (; b != end; ++b)
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{
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aut->new_edge(i, i + 1, *b);
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++i;
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}
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// Close the loop
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aut->new_edge(i, j, *b);
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return aut;
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}
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}
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@ -1,5 +1,5 @@
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// -*- coding: utf-8 -*-
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// Copyright (C) 2013, 2014, 2015 Laboratoire de Recherche et
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// Copyright (C) 2013, 2014, 2015, 2016 Laboratoire de Recherche et
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// Développement de l'Epita (LRDE).
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//
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// This file is part of Spot, a model checking library.
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@ -28,7 +28,8 @@ namespace spot
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/// \brief An infinite word stored as a lasso.
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struct SPOT_API twa_word final
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{
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twa_word(const twa_run_ptr run);
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twa_word(const bdd_dict_ptr& dict);
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twa_word(const twa_run_ptr& run);
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~twa_word()
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{
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dict_->unregister_all_my_variables(this);
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@ -45,10 +46,26 @@ namespace spot
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return dict_;
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}
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twa_graph_ptr as_automaton() const;
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SPOT_API
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friend std::ostream& operator<<(std::ostream& os, const twa_word& w);
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private:
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bdd_dict_ptr dict_;
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};
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typedef std::shared_ptr<twa_word> twa_word_ptr;
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inline twa_word_ptr make_twa_word(const bdd_dict_ptr& dict)
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{
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return std::make_shared<twa_word>(dict);
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}
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inline twa_word_ptr make_twa_word(const twa_run_ptr& run)
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{
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return std::make_shared<twa_word>(run);
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}
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SPOT_API
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twa_word_ptr parse_word(const std::string& word, const bdd_dict_ptr& dict);
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}
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@ -1,7 +1,7 @@
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{
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"metadata": {
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"name": "",
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"signature": "sha256:e975b9a64657f38248c434a89f29b28f0bf90f9c40b7e8afdd7459734cbdcd38"
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"signature": "sha256:6461a5fa3f321dac24ae47d88c90f911822e003b658d05d4ef7c102ff64e058e"
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},
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"nbformat": 3,
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"nbformat_minor": 0,
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@ -139,7 +139,7 @@
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"</svg>\n"
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],
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"text": [
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"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7f4f0c2e0810> >"
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"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdd0c5d9330> >"
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]
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}
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],
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@ -294,6 +294,224 @@
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}
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],
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"prompt_number": 7
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"print(spot.parse_word('a; b; cycle{a&b}'))\n",
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"print(spot.parse_word('cycle{a&bb|bac&(aaa|bbb)}'))\n",
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"print(spot.parse_word('a; b;b; qiwuei;\"a;b&c;a\" ;cycle{a}'))"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"a; b; cycle{a & b}\n",
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"cycle{(a & bb) | (aaa & bac) | (bac & bbb)}\n",
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"a; b; b; qiwuei; \"a;b&c;a\"; cycle{a}\n"
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]
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}
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],
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"prompt_number": 8
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"print(spot.parse_word('a; b&!a; b'))"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"ename": "SyntaxError",
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"evalue": "\n>>> a; b&!a; b\n ^\nA twa_word must contain a cycle\n (<string>)",
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"output_type": "pyerr",
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"traceback": [
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"\u001b[0;36m File \u001b[0;32m\"<string>\"\u001b[0;36m, line \u001b[0;32munknown\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m \n>>> a; b&!a; b\n ^\nA twa_word must contain a cycle\n\n"
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]
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}
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],
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"prompt_number": 9
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"print(spot.parse_word('a; b; c}'))"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"ename": "SyntaxError",
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"evalue": "\n>>> a; b; c}\n ^\nExpected ';' delimiter :'}' stands for ending a cycle\n (<string>)",
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"output_type": "pyerr",
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"traceback": [
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"\u001b[0;36m File \u001b[0;32m\"<string>\"\u001b[0;36m, line \u001b[0;32munknown\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m \n>>> a; b; c}\n ^\nExpected ';' delimiter :'}' stands for ending a cycle\n\n"
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]
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}
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],
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"prompt_number": 10
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"print(spot.parse_word('a; cycle{}'))"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"ename": "SyntaxError",
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"evalue": "\n>>> a; cycle{}\n ^\nempty input\n\n (<string>)",
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"output_type": "pyerr",
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"traceback": [
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"\u001b[0;36m File \u001b[0;32m\"<string>\"\u001b[0;36m, line \u001b[0;32munknown\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m \n>>> a; cycle{}\n ^\nempty input\n\n\n"
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]
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}
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],
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"prompt_number": 11
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"print(spot.parse_word('a; cycle{!a}; a'))"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"ename": "SyntaxError",
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"evalue": "\n>>> a; cycle{!a}; a\n ^\nInput should be finished after cycle\n (<string>)",
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"output_type": "pyerr",
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"traceback": [
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"\u001b[0;36m File \u001b[0;32m\"<string>\"\u001b[0;36m, line \u001b[0;32munknown\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m \n>>> a; cycle{!a}; a\n ^\nInput should be finished after cycle\n\n"
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]
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}
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],
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"prompt_number": 12
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"w1 = spot.parse_word('a; !a; cycle{a; !a; a}')"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 13
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"w1.as_automaton()"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"metadata": {},
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"</svg>\n"
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],
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"text": [
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"<spot.impl.twa_graph; proxy of <Swig Object of type 'std::shared_ptr< spot::twa_graph > *' at 0x7fdd0c5d96c0> >"
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]
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}
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],
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"prompt_number": 14
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [],
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"language": "python",
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"metadata": {},
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"outputs": []
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}
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],
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"metadata": {}
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|
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|||
Loading…
Add table
Add a link
Reference in a new issue