codeql/swift/extractor/visitors/PatternVisitor.h

#pragma once

#include "swift/extractor/visitors/VisitorBase.h"

namespace codeql {

class PatternVisitor : public AstVisitorBase<PatternVisitor> {
 public:
  using AstVisitorBase<PatternVisitor>::AstVisitorBase;

  void visitNamedPattern(swift::NamedPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    // TODO: in some (but not all) cases, this seems to introduce a duplicate entry
    // for example the vars listed in a case stmt have a different pointer than then ones in
    // patterns.
    //  assert(pattern->getDecl() && "expect NamedPattern to have Decl");
    //  dispatcher_.emit(NamedPatternsTrap{label, pattern->getNameStr().str(),
    //                                       dispatcher_.fetchLabel(pattern->getDecl())});
    dispatcher_.emit(NamedPatternsTrap{label, pattern->getNameStr().str()});
  }

  void visitTypedPattern(swift::TypedPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    assert(pattern->getSubPattern() && "expect TypedPattern to have a SubPattern");
    dispatcher_.emit(TypedPatternsTrap{label, dispatcher_.fetchLabel(pattern->getSubPattern())});
    if (auto typeRepr = pattern->getTypeRepr()) {
      dispatcher_.emit(
          TypedPatternTypeReprsTrap{label, dispatcher_.fetchLabel(pattern->getTypeRepr())});
    }
  }

  void visitTuplePattern(swift::TuplePattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    dispatcher_.emit(TuplePatternsTrap{label});
    auto i = 0u;
    for (auto p : pattern->getElements()) {
      dispatcher_.emit(
          TuplePatternElementsTrap{label, i++, dispatcher_.fetchLabel(p.getPattern())});
    }
  }
  void visitAnyPattern(swift::AnyPattern* pattern) {
    dispatcher_.emit(AnyPatternsTrap{dispatcher_.assignNewLabel(pattern)});
  }

  void visitBindingPattern(swift::BindingPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    assert(pattern->getSubPattern() && "expect BindingPattern to have a SubPattern");
    dispatcher_.emit(BindingPatternsTrap{label, dispatcher_.fetchLabel(pattern->getSubPattern())});
  }

  void visitEnumElementPattern(swift::EnumElementPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    dispatcher_.emit(
        EnumElementPatternsTrap{label, dispatcher_.fetchLabel(pattern->getElementDecl())});
    if (auto subPattern = pattern->getSubPattern()) {
      dispatcher_.emit(EnumElementPatternSubPatternsTrap{
          label, dispatcher_.fetchLabel(pattern->getSubPattern())});
    }
  }

  void visitOptionalSomePattern(swift::OptionalSomePattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    assert(pattern->getSubPattern() && "expect BindingPattern to have a SubPattern");
    dispatcher_.emit(
        OptionalSomePatternsTrap{label, dispatcher_.fetchLabel(pattern->getSubPattern())});
  }

  void visitIsPattern(swift::IsPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    dispatcher_.emit(IsPatternsTrap{label});

    if (auto typeRepr = pattern->getCastTypeRepr()) {
      dispatcher_.emit(IsPatternCastTypeReprsTrap{label, dispatcher_.fetchLabel(typeRepr)});
    }
    if (auto subPattern = pattern->getSubPattern()) {
      dispatcher_.emit(IsPatternSubPatternsTrap{label, dispatcher_.fetchLabel(subPattern)});
    }
  }

  void visitExprPattern(swift::ExprPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    assert(pattern->getSubExpr() && "expect ExprPattern to have SubExpr");
    dispatcher_.emit(ExprPatternsTrap{label, dispatcher_.fetchLabel(pattern->getSubExpr())});
  }

  void visitParenPattern(swift::ParenPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    assert(pattern->getSubPattern() && "expect ParenPattern to have SubPattern");
    dispatcher_.emit(ParenPatternsTrap{label, dispatcher_.fetchLabel(pattern->getSubPattern())});
  }

  void visitBoolPattern(swift::BoolPattern* pattern) {
    auto label = dispatcher_.assignNewLabel(pattern);
    dispatcher_.emit(BoolPatternsTrap{label, pattern->getValue()});
  }
};
}  // namespace codeql