// Scintilla source code edit control
/** @file LexBaan.cxx
 ** Lexer for Baan.
 ** Based heavily on LexCPP.cxx
 **/
// Copyright 2001- by Vamsi Potluru <vamsi@who.net> & Praveen Ambekar <ambekarpraveen@yahoo.com>
// The License.txt file describes the conditions under which this software may be distributed.

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>

#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"

#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"

#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif

static inline bool IsAWordChar(const int  ch) {
    return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' || ch == '$' || ch == ':');
}

static inline bool IsAWordStart(const int ch) {
    return (ch < 0x80) && (isalnum(ch) || ch == '_');
}

static void ColouriseBaanDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
                            Accessor &styler) {

    WordList &keywords = *keywordlists[0];
    WordList &keywords2 = *keywordlists[1];
    bool stylingWithinPreprocessor = styler.GetPropertyInt("styling.within.preprocessor") != 0;

    if (initStyle == SCE_BAAN_STRINGEOL)    // Does not leak onto next line
        initStyle = SCE_BAAN_DEFAULT;

    int visibleChars = 0;

    StyleContext sc(startPos, length, initStyle, styler);

    for (; sc.More(); sc.Forward()) {

        if (sc.state == SCE_BAAN_OPERATOR) {
            sc.SetState(SCE_BAAN_DEFAULT);
        } else if (sc.state == SCE_BAAN_NUMBER) {
            if (!IsAWordChar(sc.ch)) {
                sc.SetState(SCE_BAAN_DEFAULT);
            }
        } else if (sc.state == SCE_BAAN_IDENTIFIER) {
            if (!IsAWordChar(sc.ch)) {
                char s[100];
                sc.GetCurrentLowered(s, sizeof(s));
                if (keywords.InList(s)) {
                    sc.ChangeState(SCE_BAAN_WORD);
                } else if (keywords2.InList(s)) {
                    sc.ChangeState(SCE_BAAN_WORD2);
                }
                sc.SetState(SCE_BAAN_DEFAULT);
            }
        } else if (sc.state == SCE_BAAN_PREPROCESSOR) {
            if (stylingWithinPreprocessor) {
                if (IsASpace(sc.ch)) {
                    sc.SetState(SCE_BAAN_DEFAULT);
                }
            } else {
                if (sc.atLineEnd && (sc.chNext != '^')) {
                    sc.SetState(SCE_BAAN_DEFAULT);
                }
            }
        } else if (sc.state == SCE_BAAN_COMMENT) {
            if (sc.atLineEnd) {
                sc.SetState(SCE_BAAN_DEFAULT);
            }
        } else if (sc.state == SCE_BAAN_COMMENTDOC) {
            if (sc.MatchIgnoreCase("enddllusage")) {
                for (unsigned int i = 0; i < 10; i++){
                    sc.Forward();
                }
                sc.ForwardSetState(SCE_BAAN_DEFAULT);
            }
        } else if (sc.state == SCE_BAAN_STRING) {
            if (sc.ch == '\"') {
                sc.ForwardSetState(SCE_BAAN_DEFAULT);
            } else if ((sc.atLineEnd) && (sc.chNext != '^')) {
                sc.ChangeState(SCE_BAAN_STRINGEOL);
                sc.ForwardSetState(SCE_C_DEFAULT);
                visibleChars = 0;
            }
        }

        if (sc.state == SCE_BAAN_DEFAULT) {
            if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
                sc.SetState(SCE_BAAN_NUMBER);
            } else if (sc.MatchIgnoreCase("dllusage")){
                    sc.SetState(SCE_BAAN_COMMENTDOC);
                    do {
                        sc.Forward();
                    } while ((!sc.atLineEnd) && sc.More());
            } else if (IsAWordStart(sc.ch)) {
                    sc.SetState(SCE_BAAN_IDENTIFIER);
            } else if (sc.Match('|')){
                    sc.SetState(SCE_BAAN_COMMENT);
            } else if (sc.ch == '\"') {
                sc.SetState(SCE_BAAN_STRING);
            } else if (sc.ch == '#' && visibleChars == 0) {
                // Preprocessor commands are alone on their line
                sc.SetState(SCE_BAAN_PREPROCESSOR);
                // Skip whitespace between # and preprocessor word
                do {
                    sc.Forward();
                } while (IsASpace(sc.ch) && sc.More());
            } else if (isoperator(static_cast<char>(sc.ch))) {
                sc.SetState(SCE_BAAN_OPERATOR);
            }
        }
        if (sc.atLineEnd) {
            // Reset states to begining of colourise so no surprises
            // if different sets of lines lexed.
            visibleChars = 0;
        }
        if (!IsASpace(sc.ch)) {
            visibleChars++;
        }
    }
    sc.Complete();
}

static void FoldBaanDoc(unsigned int startPos, int length, int initStyle, WordList *[],
                            Accessor &styler) {
    bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
    bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
    unsigned int endPos = startPos + length;
    int visibleChars = 0;
    int lineCurrent = styler.GetLine(startPos);
    int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
    int levelCurrent = levelPrev;
    char chNext = styler[startPos];
    int styleNext = styler.StyleAt(startPos);
    int style = initStyle;
    for (unsigned int i = startPos; i < endPos; i++) {
        char ch = chNext;
        chNext = styler.SafeGetCharAt(i + 1);
        int stylePrev = style;
        style = styleNext;
        styleNext = styler.StyleAt(i + 1);
        bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
        if (foldComment &&
            (style == SCE_BAAN_COMMENT || style == SCE_BAAN_COMMENTDOC)) {
            if (style != stylePrev) {
                levelCurrent++;
            } else if ((style != styleNext) && !atEOL) {
                // Comments don't end at end of line and the next character may be unstyled.
                levelCurrent--;
            }
        }
        if (style == SCE_BAAN_OPERATOR) {
            if (ch == '{') {
                levelCurrent++;
            } else if (ch == '}') {
                levelCurrent--;
            }
        }
        if (atEOL) {
            int lev = levelPrev;
            if (visibleChars == 0 && foldCompact)
                lev |= SC_FOLDLEVELWHITEFLAG;
            if ((levelCurrent > levelPrev) && (visibleChars > 0))
                lev |= SC_FOLDLEVELHEADERFLAG;
            if (lev != styler.LevelAt(lineCurrent)) {
                styler.SetLevel(lineCurrent, lev);
            }
            lineCurrent++;
            levelPrev = levelCurrent;
            visibleChars = 0;
        }
        if (!isspacechar(ch))
            visibleChars++;
    }
    // Fill in the real level of the next line, keeping the current flags as they will be filled in later
    int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
    styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}

LexerModule lmBaan(SCLEX_BAAN, ColouriseBaanDoc, "baan", FoldBaanDoc);
