/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

#include "Vocabulary.h"

#include "Token.h"

using namespace antlr4::dfa;

const Vocabulary Vocabulary::EMPTY_VOCABULARY;

Vocabulary::Vocabulary(
    const std::vector<std::string>& literalNames, const std::vector<std::string>& symbolicNames)
    : Vocabulary(literalNames, symbolicNames, {}) {}

Vocabulary::Vocabulary(const std::vector<std::string>& literalNames,
    const std::vector<std::string>& symbolicNames, const std::vector<std::string>& displayNames)
    : _literalNames(literalNames), _symbolicNames(symbolicNames), _displayNames(displayNames),
      _maxTokenType(
          std::max(_displayNames.size(), std::max(_literalNames.size(), _symbolicNames.size())) -
          1) {
    // See note here on -1 part: https://github.com/antlr/antlr4/pull/1146
}

Vocabulary::~Vocabulary() = default;

Vocabulary Vocabulary::fromTokenNames(const std::vector<std::string>& tokenNames) {
    if (tokenNames.empty()) {
        return EMPTY_VOCABULARY;
    }

    std::vector<std::string> literalNames = tokenNames;
    std::vector<std::string> symbolicNames = tokenNames;
    std::locale locale;
    for (size_t i = 0; i < tokenNames.size(); i++) {
        const std::string& tokenName = tokenNames[i];
        if (tokenName.empty()) {
            continue;
        } else if (tokenName.front() == '\'') {
            symbolicNames[i].clear();
        } else if (std::isupper(tokenName.front(), locale)) {
            literalNames[i].clear();
        } else {
            // wasn't a literal or symbolic name
            literalNames[i].clear();
            symbolicNames[i].clear();
        }
    }

    return Vocabulary(literalNames, symbolicNames, tokenNames);
}

size_t Vocabulary::getMaxTokenType() const {
    return _maxTokenType;
}

std::string Vocabulary::getLiteralName(size_t tokenType) const {
    if (tokenType < _literalNames.size()) {
        return _literalNames[tokenType];
    }

    return "";
}

std::string Vocabulary::getSymbolicName(size_t tokenType) const {
    if (tokenType == Token::EOF) {
        return "EOF";
    }

    if (tokenType < _symbolicNames.size()) {
        return _symbolicNames[tokenType];
    }

    return "";
}

std::string Vocabulary::getDisplayName(size_t tokenType) const {
    if (tokenType < _displayNames.size()) {
        std::string displayName = _displayNames[tokenType];
        if (!displayName.empty()) {
            return displayName;
        }
    }

    std::string literalName = getLiteralName(tokenType);
    if (!literalName.empty()) {
        return literalName;
    }

    std::string symbolicName = getSymbolicName(tokenType);
    if (!symbolicName.empty()) {
        return symbolicName;
    }

    return std::to_string(tokenType);
}
