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#include "ExpressionParser.h"
#include "actions/expression/nodes/FunctionCallExpression.h"
#include "actions/expression/nodes/LiteralExpression.h"
#include "actions/expression/nodes/RandomRangeExpression.h"
#include "actions/expression/nodes/VariableReferenceExpression.h"
#include "actions/expression/nodes/VectorConstructorExpression.h"
#include "libs/antlr/ErrorListener.h"
PUSH_SUPPRESS_WARNINGS
#include "action_expression/generated/ActionExpressionLexer.h"
#include "action_expression/generated/ActionExpressionParser.h"
#include "action_expression/generated/ActionExpressionVisitor.h"
POP_SUPPRESS_WARNINGS
namespace actions {
namespace expression {
namespace {
class ExpressionBuilderVisitor : public ActionExpressionVisitor {
public:
antlrcpp::Any visitExpression_main(ActionExpressionParser::Expression_mainContext* context) override
{
return visit(context->expression());
}
antlrcpp::Any visitExpression(ActionExpressionParser::ExpressionContext* context) override
{
if (context->value_expression() != nullptr) {
return visit(context->value_expression());
}
if (context->parenthesis_expression()) {
return visit(context->parenthesis_expression());
}
if (context->random_range_expression()) {
return visit(context->random_range_expression());
}
if (context->variable_reference_expression()) {
return visit(context->variable_reference_expression());
}
// This is an operator so treat it as one.
antlr4::Token* operatorTok;
SCP_string operatorText;
if (context->PLUS() != nullptr) {
operatorTok = context->PLUS()->getSymbol();
operatorText = context->PLUS()->getText();
} else {
operatorTok = context->MINUS()->getSymbol();
operatorText = context->MINUS()->getText();
}
const auto leftExpr = visit(context->expression(0)).as<std::shared_ptr<nodes::AbstractExpression>>();
const auto rightExpr = visit(context->expression(1)).as<std::shared_ptr<nodes::AbstractExpression>>();
auto operatorExpression = std::make_shared<nodes::FunctionCallExpression>(operatorTok,
true,
std::move(operatorText),
SCP_vector<std::shared_ptr<nodes::AbstractExpression>>{leftExpr, rightExpr});
return std::static_pointer_cast<nodes::AbstractExpression>(operatorExpression);
}
antlrcpp::Any visitVariable_reference_expression(
ActionExpressionParser::Variable_reference_expressionContext* context) override
{
const auto identifiers = context->IDENTIFIER();
SCP_vector<SCP_string> partNames;
partNames.reserve(identifiers.size());
std::transform(identifiers.begin(),
identifiers.end(),
std::back_inserter(partNames),
[](antlr4::tree::TerminalNode* node) { return node->getText(); });
SCP_vector<antlr4::Token*> partTokens;
partTokens.reserve(identifiers.size());
std::transform(identifiers.begin(),
identifiers.end(),
std::back_inserter(partTokens),
[](antlr4::tree::TerminalNode* node) { return node->getSymbol(); });
auto expression =
std::make_shared<nodes::VariableReferenceExpression>(std::move(partNames), std::move(partTokens));
return std::static_pointer_cast<nodes::AbstractExpression>(expression);
}
antlrcpp::Any visitRandom_range_expression(ActionExpressionParser::Random_range_expressionContext* context) override
{
auto expression = std::make_shared<nodes::RandomRangeExpression>(context->RAND_L_PAREN()->getSymbol(),
visit(context->expression(0)).as<std::shared_ptr<nodes::AbstractExpression>>(),
visit(context->expression(1)).as<std::shared_ptr<nodes::AbstractExpression>>());
return std::static_pointer_cast<nodes::AbstractExpression>(expression);
}
antlrcpp::Any visitLiteral_expression(ActionExpressionParser::Literal_expressionContext* context) override
{
std::shared_ptr<nodes::LiteralExpression> expression;
if (context->FLOAT() != nullptr) {
expression = std::make_shared<nodes::LiteralExpression>(context->FLOAT()->getSymbol(),
Value(std::stof(context->FLOAT()->getText())));
} else if (context->INT() != nullptr) {
expression = std::make_shared<nodes::LiteralExpression>(context->INT()->getSymbol(),
Value(std::stoi(context->INT()->getText())));
} else {
const auto idText = context->STRING()->getText();
// Cut off the first and last characters since those are the < > braces
expression = std::make_shared<nodes::LiteralExpression>(context->STRING()->getSymbol(),
Value(idText.substr(1, idText.size() - 2)));
}
return std::static_pointer_cast<nodes::AbstractExpression>(expression);
}
antlrcpp::Any visitParenthesis_expression(ActionExpressionParser::Parenthesis_expressionContext* context) override
{
return visit(context->expression());
}
antlrcpp::Any visitValue_expression(ActionExpressionParser::Value_expressionContext* context) override
{
return visitChildren(context);
}
antlrcpp::Any visitVec3d_constructor(ActionExpressionParser::Vec3d_constructorContext* context) override
{
auto xExpression = visit(context->expression(0)).as<std::shared_ptr<nodes::AbstractExpression>>();
auto yExpression = visit(context->expression(1)).as<std::shared_ptr<nodes::AbstractExpression>>();
auto zExpression = visit(context->expression(2)).as<std::shared_ptr<nodes::AbstractExpression>>();
auto expression = std::make_shared<nodes::VectorConstructorExpression>(context->L_PAREN()->getSymbol(),
xExpression,
yExpression,
zExpression);
return std::static_pointer_cast<nodes::AbstractExpression>(expression);
}
};
} // namespace
ExpressionParser::ExpressionParser(SCP_string expressionText) : m_expressionText(std::move(expressionText)) {}
std::shared_ptr<nodes::AbstractExpression> ExpressionParser::parse(const ParseContext& context)
{
antlr4::ANTLRInputStream input(m_expressionText);
ActionExpressionLexer lexer(&input);
antlr4::CommonTokenStream tokens(&lexer);
::ActionExpressionParser parser(&tokens);
// By default we log to stderr which we do not want
parser.removeErrorListeners();
libs::antlr::ErrorListener errListener;
parser.addErrorListener(&errListener);
antlr4::tree::ParseTree* tree = parser.expression_main();
std::shared_ptr<nodes::AbstractExpression> exprReturn;
if (errListener.diagnostics.empty()) {
// Only do semantic checking if syntax is valid
ExpressionBuilderVisitor builder;
exprReturn = tree->accept(&builder).as<std::shared_ptr<nodes::AbstractExpression>>();
if (!exprReturn->validate(&parser, context)) {
exprReturn = nullptr;
} else {
exprReturn->validationDone();
}
}
if (!errListener.diagnostics.empty()) {
SCP_stringstream outStream;
for (const auto& diag : errListener.diagnostics) {
SCP_string tokenUnderline;
if (diag.tokenLength > 1) {
tokenUnderline = SCP_string(diag.tokenLength - 1, '~');
}
outStream << m_expressionText << "\n"
<< SCP_string(diag.columnInLine, ' ') << "^" << tokenUnderline << "\n"
<< diag.errorMessage << "\n";
}
m_errorText = outStream.str();
return nullptr;
}
return exprReturn;
}
const SCP_string& ExpressionParser::getErrorText() const
{
return m_errorText;
}
} // namespace expression
} // namespace actions
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