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// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
//
// 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.
#ifndef FORTRAN_PARSER_USER_STATE_H_
#define FORTRAN_PARSER_USER_STATE_H_
// Instances of ParseState (parse-state.h) incorporate instances of this
// UserState class, which encapsulates any semantic information necessary for
// parse tree construction so as to avoid any need for representing
// state in static data.
#include "char-block.h"
#include "features.h"
#include "parse-tree.h"
#include "../common/idioms.h"
#include <cinttypes>
#include <optional>
#include <ostream>
#include <set>
#include <unordered_set>
namespace Fortran::parser {
class CookedSource;
class ParsingLog;
class ParseState;
class Success {}; // for when one must return something that's present
class UserState {
public:
UserState(const CookedSource &cooked, LanguageFeatureControl features)
: cooked_{cooked}, features_{features} {}
const CookedSource &cooked() const { return cooked_; }
const LanguageFeatureControl &features() const { return features_; }
std::ostream *debugOutput() const { return debugOutput_; }
UserState &set_debugOutput(std::ostream *out) {
debugOutput_ = out;
return *this;
}
ParsingLog *log() const { return log_; }
UserState &set_log(ParsingLog *log) {
log_ = log;
return *this;
}
bool instrumentedParse() const { return instrumentedParse_; }
UserState &set_instrumentedParse(bool yes) {
instrumentedParse_ = yes;
return *this;
}
void NewSubprogram() {
doLabels_.clear();
nonlabelDoConstructNestingDepth_ = 0;
oldStructureComponents_.clear();
}
using Label = std::uint64_t;
bool IsDoLabel(Label label) const {
return doLabels_.find(label) != doLabels_.end();
}
bool InNonlabelDoConstruct() const {
return nonlabelDoConstructNestingDepth_ > 0;
}
void NewDoLabel(Label label) { doLabels_.insert(label); }
void EnterNonlabelDoConstruct() { ++nonlabelDoConstructNestingDepth_; }
void LeaveDoConstruct() {
if (nonlabelDoConstructNestingDepth_ > 0) {
--nonlabelDoConstructNestingDepth_;
}
}
void NoteOldStructureComponent(const CharBlock &name) {
oldStructureComponents_.insert(name);
}
bool IsOldStructureComponent(const CharBlock &name) const {
return oldStructureComponents_.find(name) != oldStructureComponents_.end();
}
private:
const CookedSource &cooked_;
std::ostream *debugOutput_{nullptr};
ParsingLog *log_{nullptr};
bool instrumentedParse_{false};
std::unordered_set<Label> doLabels_;
int nonlabelDoConstructNestingDepth_{0};
std::set<CharBlock> oldStructureComponents_;
LanguageFeatureControl features_;
};
// Definitions of parser classes that manipulate the UserState.
struct StartNewSubprogram {
using resultType = Success;
static std::optional<Success> Parse(ParseState &);
};
struct CapturedLabelDoStmt {
using resultType = Statement<common::Indirection<LabelDoStmt>>;
static std::optional<resultType> Parse(ParseState &);
};
struct EndDoStmtForCapturedLabelDoStmt {
using resultType = Statement<common::Indirection<EndDoStmt>>;
static std::optional<resultType> Parse(ParseState &);
};
struct EnterNonlabelDoConstruct {
using resultType = Success;
static std::optional<Success> Parse(ParseState &);
};
struct LeaveDoConstruct {
using resultType = Success;
static std::optional<Success> Parse(ParseState &);
};
struct OldStructureComponentName {
using resultType = Name;
static std::optional<Name> Parse(ParseState &);
};
struct StructureComponents {
using resultType = DataComponentDefStmt;
static std::optional<DataComponentDefStmt> Parse(ParseState &);
};
} // namespace Fortran::parser
#endif // FORTRAN_PARSER_USER_STATE_H_
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