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66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#include <AzCore/std/string/regex.h>
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#include <ExpressionEngine/ExpressionVariable.h>
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#include <ExpressionEngine/InternalTypes.h>
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namespace ExpressionEvaluation
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{
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///////////////////
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// VariableParser
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///////////////////
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ElementInformation VariableParser::GetVariableInformation(const AZStd::string& displayName)
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{
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ElementInformation elementInformation;
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elementInformation.m_allowOnOperatorStack = false;
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elementInformation.m_id = InternalTypes::Variable;
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elementInformation.m_extraStore = VariableDescriptor(displayName);
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return elementInformation;
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}
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VariableParser::VariableParser()
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: m_regex(R"(^\{[^\}]*\})")
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{
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}
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VariableParser::ParseResult VariableParser::ParseElement(const AZStd::string& inputText, size_t offset) const
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{
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AZStd::smatch match;
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ParseResult result;
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if (AZStd::regex_search(&inputText.at(offset), match, m_regex))
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{
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AZStd::string matchedCharacters = match[0].str();
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result.m_charactersConsumed = matchedCharacters.length();
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AZStd::string variableName = matchedCharacters.substr(1, matchedCharacters.length() - 2);
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result.m_element = GetVariableInformation(variableName);
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}
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return result;
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}
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void VariableParser::EvaluateToken(const ElementInformation& parseResult, ExpressionResultStack& evaluationStack) const
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{
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AZ_UNUSED(parseResult);
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AZ_UNUSED(evaluationStack);
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AZ_Error("ExpressionParser", false, "VariableInterface should never be used to evaluate Variable information.");
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}
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}
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