254 lines
7.9 KiB
C++
254 lines
7.9 KiB
C++
#include <plasp/pddl/Expression.h>
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#include <plasp/pddl/Context.h>
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#include <plasp/pddl/Domain.h>
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#include <plasp/pddl/ExpressionContext.h>
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#include <plasp/pddl/Identifier.h>
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#include <plasp/pddl/IO.h>
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#include <plasp/pddl/expressions/And.h>
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#include <plasp/pddl/expressions/Imply.h>
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#include <plasp/pddl/expressions/Not.h>
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#include <plasp/pddl/expressions/Or.h>
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#include <plasp/pddl/expressions/Predicate.h>
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#include <plasp/pddl/expressions/PredicateDeclaration.h>
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#include <plasp/pddl/expressions/Unsupported.h>
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#include <plasp/utils/IO.h>
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#include <plasp/utils/ParserException.h>
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namespace plasp
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{
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namespace pddl
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Expression
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseEffectBodyExpression(Context &context, ExpressionContext &expressionContext);
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ExpressionPointer parsePredicate(Context &context, ExpressionContext &expressionContext);
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parsePreconditionExpression(Context &context,
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ExpressionContext &expressionContext)
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{
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auto &parser = context.parser;
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parser.skipWhiteSpace();
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ExpressionPointer expression;
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if ((expression = expressions::And::parse(context, expressionContext, parsePreconditionExpression)))
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return expression;
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const auto position = parser.position();
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parser.expect<std::string>("(");
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const auto expressionIdentifierPosition = parser.position();
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if (parser.probeIdentifier("forall", isIdentifier)
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|| parser.probeIdentifier("preference", isIdentifier))
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{
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// TODO: refactor
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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return expressions::Unsupported::parse(context);
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}
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parser.seek(position);
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return parseExpression(context, expressionContext);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseExpression(Context &context, ExpressionContext &expressionContext)
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{
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auto &parser = context.parser;
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parser.skipWhiteSpace();
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ExpressionPointer expression;
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if ((expression = expressions::And::parse(context, expressionContext, parseExpression))
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|| (expression = expressions::Or::parse(context, expressionContext, parseExpression))
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|| (expression = expressions::Not::parse(context, expressionContext, parseExpression))
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|| (expression = expressions::Imply::parse(context, expressionContext, parseExpression))
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|| (expression = expressions::Predicate::parse(context, expressionContext)))
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{
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return expression;
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}
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const auto position = parser.position();
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parser.expect<std::string>("(");
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const auto expressionIdentifierPosition = parser.position();
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if (parser.probeIdentifier("exists", isIdentifier)
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|| parser.probeIdentifier("forall", isIdentifier)
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|| parser.probeIdentifier("-", isIdentifier)
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|| parser.probeIdentifier("=", isIdentifier)
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|| parser.probeIdentifier("*", isIdentifier)
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|| parser.probeIdentifier("+", isIdentifier)
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|| parser.probeIdentifier("-", isIdentifier)
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|| parser.probeIdentifier("/", isIdentifier)
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|| parser.probeIdentifier(">", isIdentifier)
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|| parser.probeIdentifier("<", isIdentifier)
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|| parser.probeIdentifier("=", isIdentifier)
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|| parser.probeIdentifier(">=", isIdentifier)
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|| parser.probeIdentifier("<=", isIdentifier))
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{
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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return expressions::Unsupported::parse(context);
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}
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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throw utils::ParserException(context.parser, "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseEffectExpression(Context &context, ExpressionContext &expressionContext)
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{
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auto &parser = context.parser;
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ExpressionPointer expression;
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if ((expression = expressions::And::parse(context, expressionContext, parseEffectExpression)))
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return expression;
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const auto position = parser.position();
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parser.expect<std::string>("(");
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const auto expressionIdentifierPosition = parser.position();
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if (parser.probeIdentifier("forall", isIdentifier)
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|| parser.probeIdentifier("when", isIdentifier))
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{
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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return expressions::Unsupported::parse(context);
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}
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parser.seek(position);
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return parseEffectBodyExpression(context, expressionContext);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseEffectBodyExpression(Context &context, ExpressionContext &expressionContext)
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{
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auto &parser = context.parser;
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ExpressionPointer expression;
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if ((expression = expressions::Not::parse(context, expressionContext, parsePredicate))
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|| (expression = expressions::Predicate::parse(context, expressionContext)))
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{
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return expression;
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}
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const auto position = parser.position();
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parser.expect<std::string>("(");
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const auto expressionIdentifierPosition = parser.position();
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if (parser.probeIdentifier("=", isIdentifier)
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|| parser.probeIdentifier("assign", isIdentifier)
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|| parser.probeIdentifier("scale-up", isIdentifier)
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|| parser.probeIdentifier("scale-down", isIdentifier)
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|| parser.probeIdentifier("increase", isIdentifier)
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|| parser.probeIdentifier("decrease", isIdentifier))
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{
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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return expressions::Unsupported::parse(context);
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}
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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throw utils::ParserException(context.parser, "expression type “" + expressionIdentifier + "” unknown or not allowed in this context");
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parsePredicate(Context &context, ExpressionContext &expressionContext)
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{
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ExpressionPointer expression;
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if ((expression = expressions::Predicate::parse(context, expressionContext)))
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return expression;
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throw utils::ParserException(context.parser, "expected predicate");
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseLiteral(Context &context, ExpressionContext &expressionContext)
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{
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ExpressionPointer expression;
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if ((expression = parseAtomicFormula(context, expressionContext))
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|| (expression = expressions::Not::parse(context, expressionContext, parseAtomicFormula)))
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{
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return expression;
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}
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return nullptr;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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ExpressionPointer parseAtomicFormula(Context &context, ExpressionContext &expressionContext)
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{
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auto &parser = context.parser;
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ExpressionPointer expression;
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if ((expression = expressions::Predicate::parse(context, expressionContext)))
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return expression;
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const auto position = parser.position();
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if (!parser.probe<std::string>("("))
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return nullptr;
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const auto expressionIdentifierPosition = parser.position();
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if (parser.probeIdentifier("=", isIdentifier))
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{
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parser.seek(expressionIdentifierPosition);
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const auto expressionIdentifier = parser.parseIdentifier(isIdentifier);
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parser.seek(position);
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return expressions::Unsupported::parse(context);
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}
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parser.seek(position);
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return nullptr;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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}
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}
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