Ichthyostega
5e86aa3880
In accordance to the plan drafted yesterday, I will try to integrate this essential capability into the framework established thus far by a trick, requiring only minimal adjustment, but some work by the user. Since the parse function is defined as a (unqualified) template argument, it is possible to emplace either a `std::function`, or a reference thereto. For this to work, the user is required to pre-define the expected result type, and, furthermore, must later on assign a fully specified clause, which also has a model transformation binding attached to yield this predeclared result type
637 lines
28 KiB
C++
637 lines
28 KiB
C++
/*
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Parse(Test) - verify parsing textual specifications
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Copyright (C)
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2024, Hermann Vosseler <Ichthyostega@web.de>
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**Lumiera** is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version. See the file COPYING for further details.
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* *****************************************************************/
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/** @file parse-test.cpp
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** unit test \ref Parse_test
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*/
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#include "lib/test/run.hpp"
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#include "lib/test/test-helper.hpp"
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#include "lib/parse.hpp"
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//#include "lib/format-util.hpp"
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#include "lib/meta/tuple-helper.hpp"
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#include "lib/test/diagnostic-output.hpp"//////////////////TODO
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//#include "lib/util.hpp"
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//#include <vector>
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//#include <memory>
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namespace util {
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namespace parse{
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namespace test {
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using lib::test::showType;
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using lib::meta::typeSymbol;
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using lib::meta::is_Tuple;
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using std::decay_t;
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using std::get;
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// using util::join;
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// using util::isnil;
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// using std::vector;
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// using std::shared_ptr;
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// using std::make_shared;
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// using LERR_(ITER_EXHAUST);
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// using LERR_(INDEX_BOUNDS);
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namespace { // test fixture
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// const uint NUM_ELMS = 10;
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// using Numz = vector<uint>;
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} // (END)fixture
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/************************************************************************//**
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* @test verify helpers and shortcuts for simple recursive descent parsing
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* of structured data and specifications.
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*
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* @see parse.hpp
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* @see proc-node.cpp "usage example"
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*/
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class Parse_test : public Test
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{
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virtual void
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run (Arg)
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{
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simpleUsage();
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acceptTerminal();
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acceptSequential();
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acceptAlternatives();
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acceptIterWithDelim();
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acceptOptionally();
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acceptBracketed();
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verify_modelBinding();
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verify_recursiveSyntax();
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}
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/** @test TODO just blah. */
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void
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simpleUsage ()
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{
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}
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/** @test define a terminal symbol to match by parse. */
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void
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acceptTerminal()
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{
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// set up a parser function to accept some token as terminal
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auto parse = Parser{"hello (\\w+) world"};
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string toParse{"hello vile world of power"};
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auto eval = parse (toParse);
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CHECK (eval.result);
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auto res = *eval.result; // ◁——————————— the »result model« of a terminal parse is the RegExp-Matcher
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CHECK (res.ready() and not res.empty());
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CHECK (res.size() == "2"_expect );
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CHECK (res.position() == "0"_expect );
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CHECK (res.str() == "hello vile world"_expect );
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CHECK (res[1] == "vile"_expect );
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CHECK (res.suffix() == " of power"_expect );
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auto syntax = Syntax{move (parse)}; // Build a syntax clause from the simple terminal symbol parser
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CHECK (not syntax.hasResult());
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syntax.parse (toParse);
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CHECK (syntax.success()); // Syntax clause holds an implicit state from the last parse
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CHECK (syntax.getResult()[1] == "vile"_expect);
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// shorthand notation to start building a syntax
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auto syntax2 = accept ("(\\w+) world");
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CHECK (not syntax2.hasResult());
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syntax2.parse (toParse);
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CHECK (not syntax2.success());
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string bye{"cruel world"};
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syntax2.parse (bye);
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CHECK (syntax2.success());
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CHECK (syntax2.getResult()[1] == "cruel"_expect);
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// Going full circle: extract Parser definition from syntax
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auto parse2 = Parser{syntax2};
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CHECK (eval.result->str(1) == "vile");
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eval = parse2 (toParse);
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CHECK (not eval.result);
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eval = parse2 (bye);
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CHECK (eval.result->str(1) == "cruel");
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}
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/** @test define a sequence of syntax structures to match by parse.
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* - first demonstrate explicitly how the consecutive parsing works
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* and how both models are combined into a product model (tuple)
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* - demonstrate how leading whitespace is skipped automatically
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* - then perform the same parse with a Syntax clause build with
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* the `seq()` builder-DSL
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* - extend this Syntax by adding a further sequential clause.
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*/
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void
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acceptSequential()
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{ //_______________________________________________
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// Demonstration: how sequence combinator works....
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auto term1 = buildConnex ("hello");
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auto term2 = buildConnex ("world");
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auto parseSeq = [&](StrView toParse)
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{
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using R1 = decltype(term1)::Result;
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using R2 = decltype(term2)::Result;
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using ProductResult = std::tuple<R1,R2>;
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using ProductEval = Eval<ProductResult>;
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auto eval1 = term1.parse (toParse);
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if (eval1.result)
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{
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uint end1 = eval1.consumed;
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StrView restInput = toParse.substr(end1);
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auto eval2 = term2.parse (restInput);
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if (eval2.result)
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{
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uint consumedOverall = end1 + eval2.consumed;
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return ProductEval{ProductResult{move(*eval1.result)
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,move(*eval2.result)}
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,consumedOverall
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};
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}
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}
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return ProductEval{std::nullopt};
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};
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string s1{"hello millions"};
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string s2{"hello world"};
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string s3{" hello world trade "};
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auto e1 = parseSeq(s1);
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CHECK (not e1.result); // Syntax 'hello'>>'world' does not accept "hello millions"
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auto e2 = parseSeq(s2);
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CHECK ( e2.result);
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using SeqRes = decltype(e2)::Result; // Note: the result type depends on the actual syntax construction
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CHECK (is_Tuple<SeqRes>()); // Result model from sequence is the tuple of terminal results
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auto& [r1,r2] = *e2.result;
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CHECK (r1.str() == "hello"_expect);
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CHECK (r2.str() == "world"_expect);
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CHECK (term2.parse(" world").result); // Note: leading whitespace skipped by the basic terminal parsers
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CHECK (term2.parse("\n \t world ").result);
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CHECK (not term2.parse(" old ").result);
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//___________________________________________________
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// DSL parse clause builder: a sequence of terminals...
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auto syntax = accept("hello").seq("world");
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// Perform the same parse as demonstrated above....
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CHECK (not syntax.hasResult());
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syntax.parse(s1);
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CHECK (not syntax.success());
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syntax.parse(s2);
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CHECK (syntax);
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SeqRes seqModel = syntax.getResult();
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CHECK (get<0>(seqModel).str() == "hello"_expect);
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CHECK (get<1>(seqModel).str() == "world"_expect);
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// can build extended clause from existing one
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auto syntax2 = syntax.seq("trade");
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CHECK (not syntax2.hasResult());
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syntax2.parse(s2);
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CHECK (not syntax2.success());
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syntax2.parse(s3);
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CHECK (syntax2.success());
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auto seqModel2 = syntax2.getResult(); // Note: model of consecutive sequence is flattened into a single tuple
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CHECK (get<0>(seqModel2).str() == "hello"_expect);
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CHECK (get<1>(seqModel2).str() == "world"_expect);
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CHECK (get<2>(seqModel2).str() == "trade"_expect);
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}
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/** @test define alternative syntax structures to match by parse.
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* - first demonstrate how a model with alternative branches can be
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* populated and gradually extended while searching for a match.
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* - then show explicitly the logic to check and select branches
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* and construct the corresponding sum-model (variant)
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*/
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void
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acceptAlternatives()
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{ //_______________________________
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// Demonstrate Alt-Model mechanics
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using R1 = char;
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using R2 = string;
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using R3 = double;
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// build Model-Alternatives incrementally
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using A1 = AltModel<R1>;
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CHECK (showType<A1>() == "parse::AltModel<char>"_expect);
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using A2 = A1::Additionally<R2>;
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CHECK (showType<A2>() == "parse::AltModel<char, string>"_expect);
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// create instance to represent this second branch...
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A2 model2 = A2::mark_right ("seduced");
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CHECK (sizeof(A2) >= sizeof(string)+sizeof(size_t));
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CHECK (model2.SIZ == sizeof(string));
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CHECK (model2.TOP == 1);
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CHECK (model2.selected() == 1);
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CHECK (model2.get<1>() == "seduced");
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using A3 = A2::Additionally<R3>;
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A3 model3 = A3::mark_left (move (model2));
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CHECK (showType<A3>() == "parse::AltModel<char, string, double>"_expect);
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CHECK (sizeof(A3) == sizeof(A2));
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CHECK (model3.TOP == 2);
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CHECK (model3.selected() == 1);
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CHECK (model3.get<1>() == "seduced");
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auto res = move(model3);
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CHECK (showType<decltype(res)>() == "parse::AltModel<char, string, double>"_expect);
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CHECK (sizeof(res) == sizeof(A2));
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CHECK (res.selected() == 1);
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CHECK (res.get<1>() == "seduced");
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//_____________________________________________
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// Demonstration: how branch combinator works....
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auto term1 = buildConnex ("brazen");
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auto term2 = buildConnex ("bragging");
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auto parseAlt = [&](StrView toParse)
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{
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using R1 = decltype(term1)::Result;
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using R2 = decltype(term2)::Result;
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using SumResult = AltModel<R1,R2>;
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using SumEval = Eval<SumResult>;
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auto eval1 = term1.parse (toParse);
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if (eval1.result)
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{
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uint endBranch1 = eval1.consumed;
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return SumEval{SumResult::mark_left (move(*eval1.result))
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,endBranch1
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};
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}
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auto eval2 = term2.parse (toParse);
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if (eval2.result)
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{
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uint endBranch2 = eval2.consumed;
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return SumEval{SumResult::mark_right (move(*eval2.result))
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,endBranch2
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};
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}
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return SumEval{std::nullopt};
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};
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string s1{"decent contender"};
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string s2{"brazen dicktator"};
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auto e1 = parseAlt(s1);
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CHECK (not e1.result); // does not compute....
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auto e2 = parseAlt(s2); // one hell of a match!
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CHECK ( e2.result);
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CHECK (e2.result->selected() == 0); // Selector-ID of the first matching branch (here #0)
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CHECK (e2.result->get<0>().str() == "brazen"); // We know that branch#0 holds a RegExp-Matcher (from term1)
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CHECK (e2.result->get<0>().suffix() == " dicktator");
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CHECK (e2.consumed == 6);
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CHECK (s2.substr(e2.consumed) == " dicktator");
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//________________________________________________
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// DSL parse clause builder: alternative branches...
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auto syntax = accept("brazen").alt("bragging");
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// Perform the same parse as demonstrated above....
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CHECK (not syntax.hasResult());
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syntax.parse(s1);
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CHECK (not syntax.success());
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syntax.parse(s2);
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CHECK (syntax);
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auto altModel = syntax.getResult();
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CHECK (altModel.selected() == 0);
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CHECK (altModel.get<0>().str() == "brazen");
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// can build extended clause from existing one
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auto syntax2 = syntax.alt("smarmy (\\w+)");
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CHECK (not syntax2.hasResult());
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syntax2.parse(s1);
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CHECK (not syntax2.success());
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syntax2.parse(s2);
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CHECK (syntax2.success());
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CHECK (syntax2.getResult().N == 3); // Note: further branch has been folded into an extended AltModel
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CHECK (syntax2.getResult().selected() == 0); // ... string s2 still matched the same branch (#0)
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CHECK (syntax2.getResult().get<0>().str() == "brazen");
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syntax2.parse("smarmy saviour");
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CHECK (syntax2.success());
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auto altModel2 = syntax2.getResult();
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CHECK (syntax2.getResult().selected() == 2); // ... but another string can match the added branch #2
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CHECK (syntax2.getResult().get<2>().str() == "smarmy saviour");
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CHECK (syntax2.getResult().get<2>().str(1) == "saviour");
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} // Note: syntax for this branch #2 captured an additional word
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/** @test define repetitive sequence with delimiter
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* - demonstrate how actually to accept such a flexible sequence
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* - cover integration into the syntax clause DSL
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* - repetition count and delimiter
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*/
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void
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acceptIterWithDelim()
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{ //_______________________________________________
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// Demonstration: how repetitive sequence works....
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auto sep = buildConnex (",");
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auto term = buildConnex ("\\w+");
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auto parseSeq = [&](StrView toParse)
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{
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using Res = decltype(term)::Result;
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using IterResult = std::vector<Res>;
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using IterEval = Eval<IterResult>;
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uint consumed{0};
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IterResult results;
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auto hasResults = [&]{ return not results.empty(); };
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while (true)
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{
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uint offset{0};
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if (hasResults())
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{
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auto delim = sep.parse (toParse);
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if (not delim.result)
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break;
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offset += delim.consumed;
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}
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auto eval = term.parse (toParse.substr(offset));
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if (not eval.result)
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break;
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offset += eval.consumed;
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results.emplace_back (move(*eval.result));
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toParse = toParse.substr(offset);
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consumed += offset;
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}
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return hasResults()? IterEval{move(results), consumed}
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: IterEval{std::nullopt};
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};
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string s1{"seid umschlungen, Millionen"};
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string s2{"beguile, extort, profit"};
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auto e1 = parseSeq(s1);
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CHECK (e1.result);
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CHECK (e1.result->size() == 1);
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CHECK (e1.result->at(0).str() == "seid");
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CHECK (e1.result->at(0).suffix() == " umschlungen, Millionen");
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CHECK (e1.consumed == 4);
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auto e2 = parseSeq(s2);
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CHECK (e2.result);
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CHECK (e2.result->size() == 3);
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CHECK (e2.result->at(0).str() == "beguile");
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CHECK (e2.result->at(1).str() == "extort" );
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CHECK (e2.result->at(2).str() == "profit" );
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CHECK (e2.result->at(0).suffix() == ", extort, profit");
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CHECK (e2.result->at(1).suffix() == ", profit");
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CHECK (e2.result->at(2).suffix() == "" );
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CHECK (e2.consumed == s2.length());
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//______________________________________________
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// DSL parse clause builder: iterative sequence...
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auto syntax1 = accept_repeated(",", term);
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// Perform the same parse as demonstrated above....
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CHECK (not syntax1.hasResult());
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syntax1.parse(s1);
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CHECK (syntax1.success());
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auto res1 = syntax1.getResult();
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CHECK (res1.size() == 1);
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CHECK (res1.get(0).str() == "seid");
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syntax1.parse(s2);
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CHECK (syntax1.success());
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res1 = syntax1.getResult();
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CHECK (res1.size() == 3);
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CHECK (res1[0].str() == "beguile");
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CHECK (res1[1].str() == "extort" );
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CHECK (res1[2].str() == "profit" );
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auto syntax2 = accept_repeated(1,2,",", term);
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auto syntax3 = accept_repeated( 4,",", term);
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syntax2.parse(s2);
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syntax3.parse(s2);
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CHECK ( syntax2);
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CHECK (not syntax3);
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CHECK (syntax2.getResult().size() == 2);
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CHECK (s2.substr(syntax2.consumed()) == ", profit");
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auto sx = s2 + " , \tdump";
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syntax3.parse(sx);
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CHECK (syntax3);
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CHECK (syntax3.getResult().size() == 4);
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CHECK (syntax3.getResult()[0].str() == "beguile");
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CHECK (syntax3.getResult()[1].str() == "extort" );
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CHECK (syntax3.getResult()[2].str() == "profit" );
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CHECK (syntax3.getResult()[3].str() == "dump" );
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auto syntax4 = accept_repeated(term);
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syntax4.parse(s1);
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CHECK (syntax4.success());
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CHECK (syntax4.getResult().size() == 2);
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CHECK (syntax4.getResult()[0].str() == "seid");
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CHECK (syntax4.getResult()[1].str() == "umschlungen" );
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CHECK (s1.substr(syntax4.consumed()) == ", Millionen");
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}
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/** @test define compound syntax with optional sub-clause
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* - use the DSL to construct a complex syntax
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* - by default, several parts are implicitly sequenced
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* - here we combine repeated parts with an optional clause
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* - which in turn is again a compound syntax clause
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* - the produced model reflects the structure of this syntax
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* - result model of the optional clause is wrapped into `std::optional`
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* - terminal elements produce a `std::smatch` (RegExp matcher object)
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*/
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void
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acceptOptionally()
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{
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auto syntax = accept_repeated(",", "\\w+") // first we look for comma separated words
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.opt(accept("and") // then (implicitly sequenced) an optional clause
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.repeat("\\w+")); // ... comprising "and" followed by several words
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using Model = decay_t<decltype(syntax.getResult())>;
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string s1{"fearmongering, scapegoating, intimidation"};
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string s2{"charisma and divine blessing"};
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CHECK (not syntax.hasResult());
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syntax.parse(s1);
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CHECK (syntax.success());
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Model res1 = syntax.getResult();
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CHECK (typeSymbol(res1) == "SeqModel");
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CHECK (typeSymbol(res1.get<0>()) == "IterModel");
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CHECK (typeSymbol(res1.get<1>()) == "optional");
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CHECK (res1.N == 2); // 2-component tuple at top
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CHECK (res1.get<0>().size() == 3); // sequence in 1st component matched 3 elements
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CHECK (res1.get<0>()[0].str() == "fearmongering"); // elements in the sequence...
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CHECK (res1.get<0>()[1].str() == "scapegoating");
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CHECK (res1.get<0>()[2].str() == "intimidation");
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CHECK (res1.get<1>() == std::nullopt); // the optional clause did not match
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||
syntax.parse(s2);
|
||
CHECK (syntax.success());
|
||
|
||
Model res2 = syntax.getResult();
|
||
CHECK (typeSymbol(res2) == "SeqModel"); // Syntax SeqModel
|
||
CHECK (typeSymbol(res2.get<0>()) == "IterModel"); // repeat(word) opt IterModel optional
|
||
CHECK (typeSymbol(res2.get<1>()) == "optional"); // | |
|
||
CHECK (typeSymbol(*res2.get<1>()) == "SeqModel"); // Syntax SeqModel
|
||
CHECK (typeSymbol(res2.get<1>()->get<0>()) == "match_results"); // "and" repeat(word) Terminal IterModel
|
||
CHECK (typeSymbol(res2.get<1>()->get<1>()) == "IterModel"); //
|
||
|
||
CHECK (res2.get<0>().size() == 1);
|
||
CHECK (res2.get<0>()[0].str() == "charisma");
|
||
CHECK (res2.get<1>() != std::nullopt);
|
||
CHECK (res2.get<1>()->N == 2);
|
||
CHECK (res2.get<1>()->get<0>().str() == "and");
|
||
CHECK (res2.get<1>()->get<1>().size() == 2 );
|
||
CHECK (res2.get<1>()->get<1>()[0].str() == "divine" );
|
||
CHECK (res2.get<1>()->get<1>()[1].str() == "blessing" );
|
||
|
||
string s3{s1+" , "+s2};
|
||
syntax.parse(s3);
|
||
CHECK (syntax.success());
|
||
|
||
Model res3 = syntax.getResult();
|
||
CHECK (typeSymbol(res3) == "SeqModel");
|
||
CHECK (res3.get<0>().size() == 4);
|
||
CHECK (res3.get<0>()[0].str() == "fearmongering");
|
||
CHECK (res3.get<0>()[1].str() == "scapegoating");
|
||
CHECK (res3.get<0>()[2].str() == "intimidation");
|
||
CHECK (res3.get<0>()[3].str() == "charisma");
|
||
CHECK (res3.get<1>() != std::nullopt);
|
||
CHECK (res3.get<1>()->N == 2);
|
||
CHECK (res3.get<1>()->get<0>().str() == "and");
|
||
CHECK (res3.get<1>()->get<1>().size() == 2);
|
||
CHECK (res3.get<1>()->get<1>()[0].str() == "divine");
|
||
CHECK (res3.get<1>()->get<1>()[1].str() == "blessing");
|
||
}
|
||
|
||
|
||
|
||
/** @test define syntax with bracketed sub-expressions */
|
||
void
|
||
acceptBracketed()
|
||
{
|
||
string word{"\\w+"};
|
||
|
||
CHECK (not accept(word).bracket(word) .parse("so sad"));
|
||
CHECK ( accept(word).bracketOpt(word).parse("so sad"));
|
||
CHECK ( accept(word).bracketOpt(word).parse("so (sad)"));
|
||
|
||
CHECK (accept_bracket(word).parse(" ( again ) ").getResult().str() == "again");
|
||
|
||
CHECK (not accept_bracket(word) .parse("(again"));
|
||
CHECK (not accept_bracketOpt(word).parse("(again"));
|
||
CHECK ( accept_bracketOpt(word).parse("again)")); // just stops before the trailing ')'
|
||
CHECK ( accept_bracketOpt(word).parse("again)").consumed() == 5);
|
||
CHECK ( accept_bracketOpt(word).parse(" again")); // backtracks also over the whitespace
|
||
|
||
CHECK (not accept_bracket("[]",word).parse("(again)"));
|
||
CHECK (not accept_bracket("[]",word).parse("[again)"));
|
||
CHECK (not accept_bracket("[]",word).parse("(again]"));
|
||
CHECK ( accept_bracket("[]",word).parse("[again]"));
|
||
CHECK ( accept_bracket("a","n","...").parse("again")); // arbitrary expressions for open / close
|
||
CHECK (not accept_bracket("a","n","...").parse(" gain")); // opening expression "a" missing
|
||
CHECK (not accept_bracket("a","n", word).parse("again")); // "\\w+" consumes eagerly => closing expression not found
|
||
}
|
||
|
||
|
||
|
||
/** @test attach model-transformation functions at various levels,
|
||
* which is the primary intended way to build results from the parse.
|
||
*/
|
||
void
|
||
verify_modelBinding()
|
||
{
|
||
auto word{"\\w+"};
|
||
auto syntax1 = accept(word).seq(word) // get a tuple with two RegExp-Matchers
|
||
.bind([](SeqModel<smatch,smatch> res)
|
||
{
|
||
return res.get<0>().str() +"-"+ res.get<1>().str();
|
||
});
|
||
|
||
string s1{"ham actor"};
|
||
CHECK (not syntax1.hasResult());
|
||
syntax1.parse(s1);
|
||
CHECK (syntax1.success());
|
||
auto res1 = syntax1.getResult();
|
||
CHECK (showType<decltype(res1)>() == "string"); // surprise! it's a simple string (as returned from λ)
|
||
CHECK (res1 == "ham-actor"_expect);
|
||
|
||
// 💡 shortcut for RegExp match groups...
|
||
auto syntax1b = accept("(\\w+) (\\w+)");
|
||
CHECK (accept(syntax1b).bindMatch( ).parse(s1).getResult() == "ham actor"_expect );
|
||
CHECK (accept(syntax1b).bindMatch(1).parse(s1).getResult() == "ham"_expect );
|
||
CHECK (accept(syntax1b).bindMatch(2).parse(s1).getResult() == "actor"_expect );
|
||
CHECK (accept(syntax1b).bindMatch(3).parse(s1).getResult() == ""_expect );
|
||
|
||
auto wordEx = accept(word).bindMatch();
|
||
auto syntax1c = accept(wordEx)
|
||
.seq(wordEx) // sub-expressions did already transform to string
|
||
.bind([](SeqModel<string,string> res)
|
||
{ return res.get<0>() +"-"+ res.get<1>(); });
|
||
|
||
CHECK (syntax1c.parse("ham actor").getResult() == "ham-actor");
|
||
CHECK (syntax1c.parse("con artist").getResult() == "con-artist");
|
||
|
||
auto syntax1d = accept(word).seq(word)
|
||
.bindMatch(); // generic shortcut: ignore model, yield accepted part of input
|
||
CHECK (syntax1d.parse("ham actor").getResult() == "ham actor");
|
||
CHECK (syntax1d.parse(" ham actor").getResult() == "ham actor");
|
||
|
||
// another example to demonstrate arbitrary transformations:
|
||
// each sub-expr counts the letters, and the top-level binding sums those up
|
||
auto letterCnt = accept(word).bindMatch().bind([](string s){ return s.size(); });
|
||
auto syntax1e = accept(letterCnt)
|
||
.seq(letterCnt)
|
||
.bind([](auto m){ auto [l1,l2] = m; return l1+l2; });
|
||
// note this time we provide a λ-generic and use a structured binding
|
||
CHECK (syntax1e.parse("ham actor").getResult() == 8);
|
||
CHECK (syntax1e.parse("con artist").getResult() == 9);
|
||
}
|
||
|
||
|
||
/** @test definition of recursive Syntax clauses
|
||
*/
|
||
void
|
||
verify_recursiveSyntax()
|
||
{
|
||
auto recursive = expectResult<int>();
|
||
|
||
string s1{"great ! great ! great"};
|
||
}
|
||
};
|
||
|
||
LAUNCHER (Parse_test, "unit common");
|
||
|
||
|
||
}}} // namespace util::parse::test
|
||
|