/* This file is part of KDevelop
    SPDX-FileCopyrightText: 2002, 2003 Roberto Raggi <roberto@kdevelop.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#ifndef PARSER_H
#define PARSER_H

#include "ast.h"

// qt includes
#include <QObject>
#include <QString>
#include <QStringList>
#include <QList>
#include <set>
#include <vector>
#include <iostream>

struct ParserPrivateData;

class Driver;
class Lexer;
class Token;
struct Error;


class CommentFormatter
{
    static inline bool isWhite(QChar c)
    {
        return c.isSpace();
    }

    static void rStrip(QString str, QString& from)
    {
        if (str.isEmpty()) return;

        int i = 0;
        int ip = from.length();
        int s = from.length();

        for (int a = s-1; a >= 0; a--) {
            if (isWhite(from[a])) {
                continue;
            } else {
                if (from[a] == str[i]) {
                    i++;
                    ip = a;
                    if (i == (int)str.length()) break;
                } else {
                    break;
                }
            }
        }

        if (ip != (int)from.length()) from = from.left(ip);
    }

    static void strip(QString str, QString& from)
    {
        if (str.isEmpty()) return;

        int i = 0;
        int ip = 0;
        int s = from.length();

        for (int a = 0; a < s; a++) {
            if (isWhite(from[a])) {
                continue;
            } else {
                if (from[a] == str[i]) {
                    i++;
                    ip = a+1;
                    if (i == (int)str.length()) break;
                } else {
                    break;
                }
            }
        }

        if (ip) from = from.mid(ip);
    }

public:

    static QString formatComment(QString comment)
    {
        QString ret;
        int i = 0;
        int s = comment.length();
        while (i < s && comment[i] == QLatin1Char('/')) {
            i++;
        }

        if (i > 1) {
            ret = comment.mid(i);
        } else {
            ///remove the star in each line
            QStringList lines = comment.split(QLatin1String("\n"));

            if (lines.isEmpty()) return ret;

            strip(QLatin1String("/**"), lines.front());
            rStrip(QLatin1String("/**"), lines.back());

            QStringList::iterator it = lines.begin();
            ++it;
            QStringList::iterator eit = lines.end();

            if (it != lines.end()) {
                --eit;

                for (; it != eit; ++it) {
                    strip(QLatin1String("*"), *it);
                }

                if (lines.front().trimmed().isEmpty())
                    lines.pop_front();

                if (lines.back().trimmed().isEmpty())
                    lines.pop_back();
            }

            ret = lines.join(QLatin1String("\n"));
        }

        return ret;
    }
};

class Comment
{
    QString m_text;
    int m_line;
    bool m_formatted;


    void format()
    {
        if (m_formatted) return;
        m_formatted = true;
        m_text = CommentFormatter::formatComment(m_text);
    }

public:
    Comment(QString text = QString(), int line = -1) : m_text(text), m_line(line), m_formatted(false)
    {
    }

    Comment(int line) : m_line(line), m_formatted(false)
    {
    }

    void operator += (Comment rhs)
    {
        format();
        rhs.format();
        m_text += QLatin1String("\n") + rhs.m_text;
    }

    operator bool() const
    {
        return !m_text.isEmpty();
    }

    operator QString()
    {
        format();
        return m_text;
    }

    inline int line() const
    {
        return m_line;
    }

    bool operator < (Comment& rhs) const
    {
        return m_line < rhs.m_line;
    }

    bool isSame (const Comment& rhs)
    {
        if (rhs.m_formatted) format();
        return m_text == rhs.m_text;
    }

    struct cmp {
        bool operator () (const Comment& c1, const Comment& c2) const
        {
            return c1.line() < c2.line();
        }
    };
};


class CommentStore
{
private:
    typedef std::set< Comment, Comment::cmp > CommentSet;
    CommentSet m_comments;

public:

    ///Returns the comment nearest to "end"(inclusive), and returns & removes it
    Comment getCommentInRange(int end, int start = 0)
    {
        CommentSet::iterator it = m_comments.lower_bound(end);


        while (it != m_comments.begin() && (*it).line() > end) {
            --it;
        }

        if (it != m_comments.end() && (*it).line() >= start && (*it).line() <= end) {
            Comment ret = *it;
            m_comments.erase(it);
            return ret;
        } else {
            return Comment();
        }
    }

    /**
     * Returns the comments between "end" (inclusive) and "start" and removes it
     * @param end last line to return
     * @param classInit protects against independent comments which are further away of the class
     * @param start start line to return
     * @return instance of class Comment with combined comment
     */
    Comment getCommentsInRange(int end, bool classInit = false, int start = 0)
    {
        std::vector<Comment> tempStorage; // The vector is required in order to output the comments in the correct order since the iterator goes reverse
        Comment ret;

        if (m_comments.empty())
            return ret;

        // The following lines will look ahead if there is a independent comment.
        CommentSet::iterator it = m_comments.end();
        --it; // .end() points to an element behind the container, so it's safe to move it to the actual last element
        int tempLine = (*it).line();
        if(tempLine < (end-2) && classInit) { // protects against independent comments which are further away of the class
            m_comments.clear();
            return ret;
        }
        tempStorage.push_back(*it);

        while (it != m_comments.begin() && (*it).line() >= start && (*it).line() <= end) { // goes reverse through the comments because the required comments are at the end of m_comments
            --it;
            if(tempLine == ((*it).line() + 1)) {
                tempLine--;
                tempStorage.push_back(*it);
            } else { // as soons as first independent comment is found the rest isn't interesting anymore (protects against multiline independent comments)
               m_comments.clear();
               break;
            }
        }

        for (auto it2 = tempStorage.rbegin(); it2 != tempStorage.rend(); ++it2) { // outputs the comments in the correct order
            if(it2 == tempStorage.rbegin()) {
                ret = (*it2);
            }
            else {
                ret += (*it2);
            }
        }
        return ret;
    }

    ///Returns and removes the comment in the line
    Comment getComment(int line)
    {
        CommentSet::iterator it = m_comments.find(line);
        if (it != m_comments.end()) {
            Comment ret = *it;
            m_comments.erase(it);
            return ret;
        } else {
            return Comment();
        }
    }

    void addComment(Comment comment)
    {

        CommentSet::iterator it = m_comments.find(comment);
        if (it != m_comments.end()) {
            if (comment.isSame(*it)) return;
            Comment c = *it;
            c += comment;
            comment = c;
            m_comments.erase(it);
        }

        m_comments.insert(comment);
    }

    ///Does not delete the comment
    Comment latestComment()
    {
        CommentSet::iterator it = m_comments.end();
        if (it == m_comments.begin()) return Comment();
        --it;
        return *it;
    }

    void clear()
    {
        m_comments.clear();
    }
};


#define PARSER_DEBUG_METHOD DEBUG() << __func__ << " token=" << m_lexer->lookAhead(0).text() << "\n"

class Parser : public QObject
{
    Q_OBJECT
public:
    Parser(Driver* driver, Lexer* lexer);
    virtual ~Parser();

private:
    virtual bool reportError(const Error& err);
    /** @todo remove*/ virtual bool reportError(const QString& msg);
    /** @todo remove*/ virtual void syntaxError();

public /*rules*/ :

    bool parseTranslationUnit(TranslationUnitAST::Node& node);

    bool parseDeclaration(DeclarationAST::Node& node);
    bool parseBlockDeclaration(DeclarationAST::Node& node);
    bool parseLinkageSpecification(DeclarationAST::Node& node);
    bool parseLinkageBody(LinkageBodyAST::Node& node);
    bool parseNamespace(DeclarationAST::Node& node);
    bool parseNamespaceAliasDefinition(DeclarationAST::Node& node);
    bool parseUsing(DeclarationAST::Node& node);
    bool parseUsingDirective(DeclarationAST::Node& node);
    bool parseTypedef(DeclarationAST::Node& node);
    bool parseAsmDefinition(DeclarationAST::Node& node);
    bool parseTemplateDeclaration(DeclarationAST::Node& node);
    bool parseDeclarationInternal(DeclarationAST::Node& node);

    bool parseUnqualifiedName(ClassOrNamespaceNameAST::Node& node);
    bool parseStringLiteral(AST::Node& node);
    bool parseName(NameAST::Node& node);
    bool parseOperatorFunctionId(AST::Node& node);
    bool parseTemplateArgumentList(TemplateArgumentListAST::Node& node, bool reportError=true);
    bool parseOperator(AST::Node& node);
    bool parseCvQualify(GroupAST::Node& node);
    bool parseSimpleTypeSpecifier(TypeSpecifierAST::Node& node);
    bool parsePtrOperator(AST::Node& node);
    bool parseTemplateArgument(AST::Node& node);
    bool parseTypeSpecifier(TypeSpecifierAST::Node& node);
    bool parseTypeSpecifierOrClassSpec(TypeSpecifierAST::Node& node);
    bool parseDeclarator(DeclaratorAST::Node& node);
    bool parseTemplateParameterList(TemplateParameterListAST::Node& node);
    bool parseTemplateParameter(TemplateParameterAST::Node& node);
    bool parseStorageClassSpecifier(GroupAST::Node& node);
    bool parseFunctionSpecifier(GroupAST::Node& node);
    bool parseInitDeclaratorList(InitDeclaratorListAST::Node& node);
    bool parseInitDeclarator(InitDeclaratorAST::Node& node);
    bool parseParameterDeclarationClause(ParameterDeclarationClauseAST::Node& node);
    bool parseCtorInitializer(AST::Node& node);
    bool parsePtrToMember(AST::Node& node);
    bool parseEnumSpecifier(TypeSpecifierAST::Node& node);
    bool parseClassSpecifier(TypeSpecifierAST::Node& node);
    bool parseWinDeclSpec(GroupAST::Node& node);
    bool parseElaboratedTypeSpecifier(TypeSpecifierAST::Node& node);
    bool parseDeclaratorId(NameAST::Node& node);
    bool parseExceptionSpecification(GroupAST::Node& node);
    bool parseEnumerator(EnumeratorAST::Node& node);
    bool parseTypeParameter(TypeParameterAST::Node& node);
    bool parseParameterDeclaration(ParameterDeclarationAST::Node& node);
    bool parseTypeId(AST::Node& node);
    bool parseAbstractDeclarator(DeclaratorAST::Node& node);
    bool parseParameterDeclarationList(ParameterDeclarationListAST::Node& node);
    bool parseMemberSpecification(DeclarationAST::Node& node);
    bool parseAccessSpecifier(AST::Node& node);
    bool parseTypeIdList(GroupAST::Node& node);
    bool parseMemInitializerList(AST::Node& node);
    bool parseMemInitializer(AST::Node& node);
    bool parseInitializer(AST::Node& node);
    bool parseBaseClause(BaseClauseAST::Node& node);
    bool parseBaseSpecifier(BaseSpecifierAST::Node& node);
    bool parseInitializerClause(AST::Node& node);
    bool parseMemInitializerId(NameAST::Node& node);
    bool parseFunctionBody(StatementListAST::Node& node);

    // expression
    bool skipExpression(AST::Node& node);
    bool skipCommaExpression(AST::Node& node);
    bool skipExpressionStatement(StatementAST::Node& node);

    bool parseExpression(AST::Node& node);
    bool parsePrimaryExpression(AST::Node& node);
    bool parsePostfixExpression(AST::Node& node);
    bool parseUnaryExpression(AST::Node& node);
    bool parseNewExpression(AST::Node& node);
    bool parseNewTypeId(AST::Node& node);
    bool parseNewDeclarator(AST::Node& node);
    bool parseNewInitializer(AST::Node& node);
    bool parseDeleteExpression(AST::Node& node);
    bool parseCastExpression(AST::Node& node);
    bool parsePmExpression(AST::Node& node);
    bool parseMultiplicativeExpression(AST::Node& node);
    bool parseAdditiveExpression(AST::Node& node);
    bool parseShiftExpression(AST::Node& node);
    bool parseRelationalExpression(AST::Node& node, bool templArgs=false);
    bool parseEqualityExpression(AST::Node& node, bool templArgs=false);
    bool parseAndExpression(AST::Node& node, bool templArgs=false);
    bool parseExclusiveOrExpression(AST::Node& node, bool templArgs=false);
    bool parseInclusiveOrExpression(AST::Node& node, bool templArgs=false);
    bool parseLogicalAndExpression(AST::Node& node, bool templArgs=false);
    bool parseLogicalOrExpression(AST::Node& node, bool templArgs=false);
    bool parseConditionalExpression(AST::Node& node);
    bool parseAssignmentExpression(AST::Node& node);
    bool parseConstantExpression(AST::Node& node);
    bool parseCommaExpression(AST::Node& node);
    bool parseThrowExpression(AST::Node& node);

    // statement
    bool parseCondition(ConditionAST::Node& node);
    bool parseStatement(StatementAST::Node& node);
    bool parseWhileStatement(StatementAST::Node& node);
    bool parseDoStatement(StatementAST::Node& node);
    bool parseForStatement(StatementAST::Node& node);
    bool parseForEachStatement(StatementAST::Node& node); // qt4 [erbsland]
    bool parseCompoundStatement(StatementAST::Node& node);
    bool parseForInitStatement(StatementAST::Node& node);
    bool parseIfStatement(StatementAST::Node& node);
    bool parseSwitchStatement(StatementAST::Node& node);
    bool parseLabeledStatement(StatementAST::Node& node);
    bool parseDeclarationStatement(StatementAST::Node& node);
    bool parseTryBlockStatement(StatementAST::Node& node);

    // objective c
    bool parseObjcDef(DeclarationAST::Node& node);
    bool parseObjcClassDef(DeclarationAST::Node& node);
    bool parseObjcClassDecl(DeclarationAST::Node& node);
    bool parseObjcProtocolDecl(DeclarationAST::Node& node);
    bool parseObjcAliasDecl(DeclarationAST::Node& node);
    bool parseObjcProtocolDef(DeclarationAST::Node& node);
    bool parseObjcMethodDef(DeclarationAST::Node& node);

    bool parseIvarDeclList(AST::Node& node);
    bool parseIvarDecls(AST::Node& node);
    bool parseIvarDecl(AST::Node& node);
    bool parseIvars(AST::Node& node);
    bool parseIvarDeclarator(AST::Node& node);
    bool parseMethodDecl(AST::Node& node);
    bool parseUnarySelector(AST::Node& node);
    bool parseKeywordSelector(AST::Node& node);
    bool parseSelector(AST::Node& node);
    bool parseKeywordDecl(AST::Node& node);
    bool parseReceiver(AST::Node& node);
    bool parseObjcMessageExpr(AST::Node& node);
    bool parseMessageArgs(AST::Node& node);
    bool parseKeywordExpr(AST::Node& node);
    bool parseKeywordArgList(AST::Node& node);
    bool parseKeywordArg(AST::Node& node);
    bool parseReservedWord(AST::Node& node);
    bool parseMyParms(AST::Node& node);
    bool parseMyParm(AST::Node& node);
    bool parseOptParmList(AST::Node& node);
    bool parseObjcSelectorExpr(AST::Node& node);
    bool parseSelectorArg(AST::Node& node);
    bool parseKeywordNameList(AST::Node& node);
    bool parseKeywordName(AST::Node& node);
    bool parseObjcEncodeExpr(AST::Node& node);
    bool parseObjcString(AST::Node& node);
    bool parseProtocolRefs(AST::Node& node);
    bool parseIdentifierList(GroupAST::Node& node);
    bool parseIdentifierColon(AST::Node& node);
    bool parseObjcProtocolExpr(AST::Node& node);
    bool parseObjcOpenBracketExpr(AST::Node& node);
    bool parseObjcCloseBracket(AST::Node& node);

    void nextToken(bool skipComments = true);

    ///parses all comments until the end of the line
    Comment comment();
    void preparseLineComments(int line);
    void processComment(int offset = 0);
    void clearComment();

    bool skipUntil(int token);
    bool skipUntilDeclaration();
    bool skipUntilStatement();
    bool skip(int l, int r);
    QString toString(int start, int end, const QString& sep=QLatin1String(" ")) const;

private:
    int currentLine();
    CommentStore m_commentStore;

    template<class Type>
    void eventuallyTakeComment(int startLn, int line, Type& ast);
    template<class Type>
    void eventuallyTakeComment(Type& ast);

    ParserPrivateData* d;
    Driver *m_driver;
    Lexer *m_lexer;
    Comment m_currentComment;
    int m_problems;
    int m_maxProblems;
    bool objcp;
    Parser(const Parser& source);
    void operator = (const Parser& source);
};


#endif