/*

 * Copyright 2016 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SKSL_SETTING

#define SKSL_SETTING

#include "src/sksl/SkSLContext.h"

#include "src/sksl/ir/SkSLExpression.h"

namespace SkSL {

/**

 * Represents a compile-time constant setting, such as sk_Caps.fbFetchSupport. These IRNodes should

 * only exist in a dehydrated module. These nodes are replaced with the value of the setting during

 * rehydration or compilation (i.e., whenever fReplaceSettings is true).

 */

class Setting final : public Expression {

public:

    static constexpr Kind kExpressionKind = Kind::kSetting;

    Setting(int offset, skstd::string_view name, const Type* type)

        : INHERITED(offset, kExpressionKind, type)

        , fName(std::move(name)) {}

    // Creates an SkSL setting expression if `fReplaceSettings` is false, or the current value of

    // the setting when it is true. Reports errors via the ErrorReporter.

    // (There's no failsafe Make equivalent, because there really isn't a good fallback expression

    // to produce when the `name` lookup fails. We wouldn't even know the expected type.)

    static std::unique_ptr<Expression> Convert(const Context& context, int offset,

                                               const skstd::string_view& name);

    std::unique_ptr<Expression> clone() const override {

        return std::make_unique<Setting>(fOffset, this->name(), &this->type());

    }

    const skstd::string_view& name() const {

        return fName;

    }

    String description() const override {

        return String(this->name());

    }

    bool hasProperty(Property property) const override {

        return false;

    }

private:

    skstd::string_view fName;

    using INHERITED = Expression;

};

}  // namespace SkSL

#endif