55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#include <pddl/detail/parsing/Fact.h>
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#include <pddl/AST.h>
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#include <pddl/detail/parsing/AtomicFormula.h>
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#include <pddl/detail/parsing/Expressions.h>
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#include <pddl/detail/parsing/Unsupported.h>
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namespace pddl
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{
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namespace detail
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Fact
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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std::experimental::optional<ast::Fact> parseFact(Context &context, ASTContext &astContext, VariableStack &variableStack)
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{
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auto &tokenizer = context.tokenizer;
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// Test unsupported expressions first
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const auto position = tokenizer.position();
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tokenizer.expect<std::string>("(");
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tokenizer.skipWhiteSpace();
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if (tokenizer.testIdentifierAndReturn("="))
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throw exceptUnsupportedExpression(position, context);
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tokenizer.seek(position);
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// Now, test supported expressions
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std::experimental::optional<ast::Fact> fact;
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if ((fact = parseNot<ast::AtomicFormula>(context, astContext, variableStack, parseAtomicFormula))
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|| (fact = parseAtomicFormula(context, astContext, variableStack)))
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{
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return std::move(fact.value());
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}
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// Test for “at” expressions only now to allow “at” as a predicate name
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// TODO: allow this in compatibility mode only?
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if (tokenizer.testIdentifierAndReturn("at"))
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throw exceptUnsupportedExpression(position, context);
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return std::experimental::nullopt;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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}
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}
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