evil-qemacs/lang/extra-modes.c

/*
 * Miscellaneous language modes for QEmacs.
 *
 * Copyright (c) 2000-2022 Charlie Gordon.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "qe.h"

#define MAX_KEYWORD_SIZE  16

/*---------------- sharp file coloring ----------------*/

/* Very simple colorizer: # introduces comments, that's it! */

enum {
    SHARP_STYLE_TEXT =       QE_STYLE_DEFAULT,
    SHARP_STYLE_COMMENT =    QE_STYLE_COMMENT,
};

static void sharp_colorize_line(QEColorizeContext *cp,
                               char32_t *str, int n, ModeDef *syn)
{
    int i = 0, start;
    char32_t c;

    while (i < n) {
        start = i;
        c = str[i++];
        switch (c) {
        case '#':
            i = n;
            SET_COLOR(str, start, i, SHARP_STYLE_COMMENT);
            continue;
        default:
            break;
        }
    }
}

static int sharp_mode_probe(ModeDef *mode, ModeProbeData *pd)
{
    const char *p = cs8(pd->buf);

    while (qe_isspace(*p))
        p++;

    if (*p == '#') {
        if (match_extension(pd->filename, mode->extensions))
            return 60;
        return 30;
    }
    return 1;
}

static ModeDef sharp_mode = {
    .name = "sharp",
    .extensions = "txt",
    .mode_probe = sharp_mode_probe,
    .colorize_func = sharp_colorize_line,
};

static int sharp_init(void)
{
    qe_register_mode(&sharp_mode, MODEF_SYNTAX);

    return 0;
}

/*---------------- EMF (JASSPA microemacs macro files) ----------------*/

static char const emf_keywords[] = {
    "define-macro|!emacro|!if|!elif|!else|!endif|!while|!done|"
    "!repeat|!until|!force|!return|!abort|!goto|!jump|!bell|"
};

static char const emf_types[] = {
    "|"
};

enum {
    EMF_STYLE_TEXT =       QE_STYLE_DEFAULT,
    EMF_STYLE_COMMENT =    QE_STYLE_COMMENT,
    EMF_STYLE_STRING =     QE_STYLE_STRING,
    EMF_STYLE_KEYWORD =    QE_STYLE_KEYWORD,
    EMF_STYLE_TYPE =       QE_STYLE_TYPE,
    EMF_STYLE_FUNCTION =   QE_STYLE_FUNCTION,
    EMF_STYLE_NUMBER =     QE_STYLE_NUMBER,
    EMF_STYLE_VARIABLE =   QE_STYLE_VARIABLE,
    EMF_STYLE_IDENTIFIER = QE_STYLE_DEFAULT,
    EMF_STYLE_PREPROCESS = QE_STYLE_PREPROCESS,
};

static void emf_colorize_line(QEColorizeContext *cp,
                              char32_t *str, int n, ModeDef *syn)
{
    char keyword[MAX_KEYWORD_SIZE];
    int i = 0, start, nw = 1, len, style;
    char32_t c;

    while (i < n) {
        start = i;
        c = str[i++];
        switch (c) {
        case '-':
            if (qe_isdigit(str[i]))
                goto number;
            break;
        case ';':
            i = n;
            SET_COLOR(str, start, i, EMF_STYLE_COMMENT);
            continue;
        case '\"':
            /* parse string const */
            while (i < n) {
                if (str[i] == '\\' && i + 1 < n) {
                    i += 2; /* skip escaped char */
                    continue;
                }
                if (str[i++] == '\"')
                    break;
            }
            SET_COLOR(str, start, i, EMF_STYLE_STRING);
            continue;
        default:
            break;
        }
        /* parse numbers */
        if (qe_isdigit(c)) {
        number:
            for (; i < n; i++) {
                if (!qe_isalnum(str[i]))
                    break;
            }
            SET_COLOR(str, start, i, EMF_STYLE_NUMBER);
            continue;
        }
        /* parse identifiers and keywords */
        if (c == '$' || c == '!' || c == '#' || qe_isalpha_(c)) {
            len = 0;
            keyword[len++] = c;
            for (; qe_isalnum_(str[i]) || str[i] == '-'; i++) {
                if (len < countof(keyword) - 1)
                    keyword[len++] = str[i];
            }
            keyword[len] = '\0';
            if (c == '$' || c == '#') {
                style = EMF_STYLE_VARIABLE;
            } else
            if (strfind(syn->keywords, keyword)) {
                style = EMF_STYLE_KEYWORD;
            } else
            if (strfind(syn->types, keyword)) {
                style = EMF_STYLE_TYPE;
            } else
            if (nw++ == 1) {
                style = EMF_STYLE_FUNCTION;
            } else {
                style = EMF_STYLE_IDENTIFIER;
            }
            SET_COLOR(str, start, i, style);
            continue;
        }
    }
}

static ModeDef emf_mode = {
    .name = "emf",
    .extensions = "emf",
    .keywords = emf_keywords,
    .types = emf_types,
    .colorize_func = emf_colorize_line,
};

static int emf_init(void)
{
    qe_register_mode(&emf_mode, MODEF_SYNTAX);

    return 0;
}

/*----------------*/

static int extra_modes_init(void)
{
    sharp_init();
    emf_init();
    return 0;
}

qe_module_init(extra_modes_init);