FQName.cpp

#include "FQName.h"

#include <android-base/logging.h>
#include <regex>

#define RE_COMPONENT    "[a-zA-Z_][a-zA-Z_0-9]*"
#define RE_PATH         RE_COMPONENT "([.]" RE_COMPONENT ")*"
#define RE_VERSION      "@[0-9]+[.][0-9]+"

static const std::regex kRE1("(" RE_PATH ")(" RE_VERSION ")?::(" RE_PATH ")");
static const std::regex kRE2("(" RE_VERSION ")::(" RE_PATH ")");
static const std::regex kRE3("(" RE_PATH ")(" RE_VERSION ")");
static const std::regex kRE4(RE_PATH);

namespace android {

FQName::FQName()
    : mValid(false) {
}

FQName::FQName(const std::string &s)
    : mValid(false) {
    setTo(s);
}

FQName::FQName(
        const std::string &package,
        const std::string &version,
        const std::string &name)
    : mValid(true),
      mPackage(package),
      mVersion(version),
      mName(name) {
}

bool FQName::isValid() const {
    return mValid;
}

bool FQName::isFullyQualified() const {
    return !mPackage.empty() && !mVersion.empty() && !mName.empty();
}

bool FQName::setTo(const std::string &s) {
    mPackage.clear();
    mVersion.clear();
    mName.clear();

    mValid = true;

    std::smatch match;
    if (std::regex_match(s, match, kRE1)) {
        CHECK_EQ(match.size(), 6u);

        mPackage = match.str(1);
        mVersion = match.str(3);
        mName = match.str(4);
    } else if (std::regex_match(s, match, kRE2)) {
        CHECK_EQ(match.size(), 4u);

        mVersion = match.str(1);
        mName = match.str(2);
    } else if (std::regex_match(s, match, kRE3)) {
        CHECK_EQ(match.size(), 4u);

        mPackage = match.str(1);
        mVersion = match.str(3);
    } else if (std::regex_match(s, match, kRE4)) {
        mName = match.str(0);
    } else {
        mValid = false;
    }

    return isValid();
}

std::string FQName::package() const {
    return mPackage;
}

std::string FQName::version() const {
    return mVersion;
}

std::string FQName::name() const {
    return mName;
}

void FQName::applyDefaults(
        const std::string &defaultPackage,
        const std::string &defaultVersion) {
    if (mPackage.empty()) {
        mPackage = defaultPackage;
    }

    if (mVersion.empty()) {
        mVersion = defaultVersion;
    }
}

std::string FQName::string() const {
    CHECK(mValid);

    std::string out;
    out.append(mPackage);
    out.append(mVersion);
    if (!mName.empty()) {
        if (!mPackage.empty() || !mVersion.empty()) {
            out.append("::");
        }
        out.append(mName);
    }

    return out;
}

void FQName::print() const {
    if (!mValid) {
        LOG(INFO) << "INVALID";
        return;
    }

    LOG(INFO) << string();
}

bool FQName::operator<(const FQName &other) const {
    return string() < other.string();
}

}  // namespace android