188 lines
5.5 KiB
C++
188 lines
5.5 KiB
C++
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// TnzBase includes
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#include "tgrammar.h"
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#include "tparser.h"
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#include "tunit.h"
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#include "texpression.h"
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using namespace TSyntax;
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//**********************************************************************************
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// TExpression::Imp definition
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//**********************************************************************************
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class TExpression::Imp {
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public:
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const Grammar *m_grammar; //!< (not owned) The expression's grammar
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TDoubleParam *m_param; //!< (not owned) The expression's owner
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Calculator *m_calculator; //!< (owned) Expression calculator object
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std::string m_text; //!< Text content
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std::string m_error; //!< Description of an error in the expression's text
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std::pair<int, int>
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m_errorPos; //!< Position of the error in the expression's text
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bool m_isValid, //!< Whether the expression is valid
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m_hasBeenParsed; //!< Whether the expression has already been parsed
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public:
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Imp()
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: m_grammar(0)
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, m_param(0)
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, m_calculator(0)
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, m_errorPos(0, -1)
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, m_isValid(false)
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, m_hasBeenParsed(true) {}
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~Imp() { delete m_calculator; }
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};
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//**********************************************************************************
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// TExpression implementation
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//**********************************************************************************
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TExpression::TExpression() : m_imp(new Imp()) {}
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//--------------------------------------------------------------------------
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TExpression::~TExpression() {}
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//--------------------------------------------------------------------------
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TExpression::TExpression(const TExpression &src) : m_imp(new Imp()) {
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m_imp->m_grammar = src.m_imp->m_grammar;
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m_imp->m_param = src.m_imp->m_param;
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m_imp->m_text = src.m_imp->m_text;
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m_imp->m_calculator = 0;
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m_imp->m_isValid = src.m_imp->m_isValid;
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m_imp->m_error = src.m_imp->m_error;
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m_imp->m_errorPos = src.m_imp->m_errorPos;
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m_imp->m_hasBeenParsed = false;
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}
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//--------------------------------------------------------------------------
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TExpression &TExpression::operator=(TExpression copy) {
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std::swap(copy.m_imp, m_imp);
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return *this;
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}
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//--------------------------------------------------------------------------
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void TExpression::setGrammar(const TSyntax::Grammar *grammar) {
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m_imp->m_grammar = grammar;
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m_imp->m_hasBeenParsed = false;
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}
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//--------------------------------------------------------------------------
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const TSyntax::Grammar *TExpression::getGrammar() const {
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return m_imp->m_grammar;
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}
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//--------------------------------------------------------------------------
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void TExpression::setText(std::string text) {
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if (m_imp->m_text != text) {
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m_imp->m_text = text;
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delete m_imp->m_calculator;
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m_imp->m_calculator = 0;
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m_imp->m_isValid = false;
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m_imp->m_hasBeenParsed = false;
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m_imp->m_error = "";
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m_imp->m_errorPos = std::make_pair(0, -1);
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}
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}
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//--------------------------------------------------------------------------
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std::string TExpression::getText() const { return m_imp->m_text; }
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//--------------------------------------------------------------------------
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// note: unit is used by the CycleNode node only
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TSyntax::Calculator *TExpression::getCalculator() {
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if (!m_imp->m_hasBeenParsed) parse();
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if (m_imp->m_isValid && m_imp->m_calculator)
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return m_imp->m_calculator;
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else
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return 0;
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}
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//--------------------------------------------------------------------------
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bool TExpression::isValid() {
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if (!m_imp->m_hasBeenParsed) parse();
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return m_imp->m_isValid;
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}
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//--------------------------------------------------------------------------
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std::string TExpression::getError() const { return m_imp->m_error; }
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//--------------------------------------------------------------------------
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std::pair<int, int> TExpression::getErrorPos() const {
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return m_imp->m_errorPos;
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}
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//--------------------------------------------------------------------------
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void TExpression::accept(TSyntax::CalculatorNodeVisitor &visitor) {
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if (!m_imp->m_hasBeenParsed) parse();
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if (m_imp->m_isValid && m_imp->m_calculator)
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m_imp->m_calculator->accept(visitor);
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}
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//--------------------------------------------------------------------------
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void TExpression::parse() {
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delete m_imp->m_calculator;
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m_imp->m_calculator = 0;
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m_imp->m_errorPos = std::make_pair(0, -1);
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m_imp->m_error = std::string();
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if (!m_imp->m_grammar) {
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m_imp->m_error = "No grammar defined";
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m_imp->m_isValid = false;
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} else {
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Parser parser(m_imp->m_grammar);
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m_imp->m_calculator = parser.parse(m_imp->m_text);
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if (m_imp->m_calculator)
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m_imp->m_calculator->setOwnerParameter(m_imp->m_param);
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m_imp->m_isValid = parser.isValid();
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if (!m_imp->m_isValid) {
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m_imp->m_error = parser.getError();
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m_imp->m_errorPos = parser.getErrorPos();
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}
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}
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m_imp->m_hasBeenParsed = true;
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}
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//--------------------------------------------------------------------------
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void TExpression::setOwnerParameter(TDoubleParam *param) {
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m_imp->m_param = param;
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if (m_imp->m_calculator) m_imp->m_calculator->setOwnerParameter(param);
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}
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//--------------------------------------------------------------------------
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TDoubleParam *TExpression::getOwnerParameter() const { return m_imp->m_param; }
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//--------------------------------------------------------------------------
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bool TExpression::isCycling() const {
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// TODO: this is a quick&dirty implementation to be replaced with a more
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// "semantic" one
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return getText().find("cycle") != std::string::npos;
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}
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