/*
 * 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_VARDECLARATIONS
#define SKSL_VARDECLARATIONS

#include "SkSLExpression.h"
#include "SkSLProgramElement.h"
#include "SkSLStatement.h"
#include "SkSLVariable.h"

namespace SkSL {

/**
 * A single variable declaration within a var declaration statement. For instance, the statement
 * 'int x = 2, y[3];' is a VarDeclarations statement containing two individual VarDeclaration 
 * instances.
 */
struct VarDeclaration {
    VarDeclaration(const Variable* var,
                   std::vector<std::unique_ptr<Expression>> sizes,
                   std::unique_ptr<Expression> value)
    : fVar(var)
    , fSizes(std::move(sizes))
    , fValue(std::move(value)) {}

    SkString description() const {
        SkString result = fVar->fName;
        for (const auto& size : fSizes) {
            if (size) {
                result += "[" + size->description() + "]";
            } else {
                result += "[]";
            }
        }
        if (fValue) {
            result += " = " + fValue->description();
        }
        return result;        
    }

    const Variable* fVar;
    std::vector<std::unique_ptr<Expression>> fSizes;
    std::unique_ptr<Expression> fValue;
};

/**
 * A variable declaration statement, which may consist of one or more individual variables.
 */
struct VarDeclarations : public ProgramElement {
    VarDeclarations(Position position, const Type* baseType, 
                    std::vector<VarDeclaration> vars)
    : INHERITED(position, kVar_Kind)
    , fBaseType(*baseType)
    , fVars(std::move(vars)) {}

    SkString description() const override {
        if (!fVars.size()) {
            return SkString();
        }
        SkString result = fVars[0].fVar->fModifiers.description() + fBaseType.description() + " ";
        SkString separator;
        for (const auto& var : fVars) {
            result += separator;
            separator = ", ";
            result += var.description();
        }
        return result;
    }

    const Type& fBaseType;
    std::vector<VarDeclaration> fVars;

    typedef ProgramElement INHERITED;
};

} // namespace

#endif