verilog/analysis/checkers/case_missing_default_rule.cc

// Copyright 2017-2020 The Verible Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "verilog/analysis/checkers/case_missing_default_rule.h"

#include <set>
#include <string>

#include "absl/strings/str_cat.h"
#include "common/analysis/citation.h"
#include "common/analysis/lint_rule_status.h"
#include "common/analysis/matcher/bound_symbol_manager.h"
#include "common/text/symbol.h"
#include "common/text/syntax_tree_context.h"
#include "verilog/analysis/descriptions.h"
#include "verilog/analysis/lint_rule_registry.h"

namespace verilog {
namespace analysis {

using verible::GetStyleGuideCitation;
using verible::LintRuleStatus;
using verible::LintViolation;
using verible::SyntaxTreeContext;

// Register CaseMissingDefaultRule
VERILOG_REGISTER_LINT_RULE(CaseMissingDefaultRule);

absl::string_view CaseMissingDefaultRule::Name() {
  return "case-missing-default";
}
const char CaseMissingDefaultRule::kTopic[] = "case-statements";
const char CaseMissingDefaultRule::kMessage[] =
    "Explicitly define a default case for every case statement.";

std::string CaseMissingDefaultRule::GetDescription(
    DescriptionType description_type) {
  return absl::StrCat("Checks that a default case-item is always defined. See ",
                      GetStyleGuideCitation(kTopic), ".");
}

void CaseMissingDefaultRule::HandleSymbol(
    const verible::Symbol& symbol, const verible::SyntaxTreeContext& context) {
  verible::matcher::BoundSymbolManager manager;
  if (context.DirectParentIs(NodeEnum::kCaseStatement) &&
      matcher_.Matches(symbol, &manager)) {
    violations_.insert(LintViolation(symbol, kMessage, context));
  }
}

LintRuleStatus CaseMissingDefaultRule::Report() const {
  return LintRuleStatus(violations_, Name(), GetStyleGuideCitation(kTopic));
}

}  // namespace analysis
}  // namespace verilog