evil-qemacs/lang/tiger.c

/*
 * Tiger language mode 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"

/*---------------- Tiger script coloring ----------------*/

static char const tiger_keywords[] = {
    "|array|break|do|else|end|for|function|if|in|let|nil|of|then|to|type|var|while"
    "|"
};

static char const tiger_types[] = {
    "|int|string"
    "|"
};

#if 0
static char const tiger_tokens[] = {
    "(|)|[|]|{|}|:|:=|.|,|;|*|/|+|-|=|<>|>|<|>=|<=|&||."
};
#endif

enum {
    IN_TIGER_COMMENT = 0x01,
    IN_TIGER_COMMENT_MASK = 0x0F,
    IN_TIGER_STRING  = 0x10,
    IN_TIGER_STRING2 = 0x20,
};

enum {
    TIGER_STYLE_TEXT =     QE_STYLE_DEFAULT,
    TIGER_STYLE_COMMENT =  QE_STYLE_COMMENT,
    TIGER_STYLE_STRING =   QE_STYLE_STRING,
    TIGER_STYLE_NUMBER =   QE_STYLE_NUMBER,
    TIGER_STYLE_KEYWORD =  QE_STYLE_KEYWORD,
    TIGER_STYLE_TYPE =     QE_STYLE_TYPE,
    TIGER_STYLE_FUNCTION = QE_STYLE_FUNCTION,
};

static void tiger_colorize_line(QEColorizeContext *cp,
                                char32_t *str, int n, ModeDef *syn)
{
    int i = 0, j, start = i;
    char32_t c, sep = 0;
    int state = cp->colorize_state;
    char kbuf[64];

    if (state & IN_TIGER_COMMENT_MASK) {
        goto parse_comment;
    }
    if (state & IN_TIGER_STRING2) {
        goto parse_string2;
    }
    if (state & IN_TIGER_STRING) {
        goto parse_string;
    }

    while (i < n) {
        start = i;
        c = str[i++];
        switch (c) {
        case '/':
            if (str[i] == '*') {
                /* normal comment */
                i++;
                state |= IN_TIGER_COMMENT;
            parse_comment:
                for (; i < n; i++) {
                    if (str[i] == '*' && str[i + 1] == '/') {
                        i += 2;
                        state -= IN_TIGER_COMMENT;
                        if (!(state & IN_TIGER_COMMENT_MASK))
                            break;
                    } else
                    if (str[i] == '/' && str[i + 1] == '*') {
                        i += 2;
                        if ((state & IN_TIGER_COMMENT_MASK) != IN_TIGER_COMMENT_MASK)
                            state += IN_TIGER_COMMENT;
                    }
                }
                SET_COLOR(str, start, i, TIGER_STYLE_COMMENT);
                continue;
            }
            break;
        case '\"':
            /* parse string const */
            sep = c;
            state |= IN_TIGER_STRING;
        parse_string:
            while (i < n) {
                c = str[i++];
                if (c == '\\') {
                    if (i == n) {
                        state |= IN_TIGER_STRING2;
                        break;
                    }
                    if (str[i] == ' ') {
                        state |= IN_TIGER_STRING2;
                    parse_string2:
                        while (i < n && str[i] == ' ')
                            i++;
                        if (i == n)
                            break;
                        if (str[i] == '\\')
                            i++;
                        state &= ~IN_TIGER_STRING2;
                    } else {
                        i += 1;
                    }
                } else
                if (c == sep) {
                    state &= ~IN_TIGER_STRING;
                    break;
                }
            }
            SET_COLOR(str, start, i, TIGER_STYLE_STRING);
            continue;
        default:
            if (qe_isdigit(c)) {
                for (; i < n; i++) {
                    if (!qe_isdigit(str[i]))
                        break;
                }
                SET_COLOR(str, start, i, TIGER_STYLE_NUMBER);
                continue;
            }
            if (qe_isalpha(c)) {
                i += ustr_get_identifier(kbuf, countof(kbuf), c, str, i, n);
                if (strfind(syn->keywords, kbuf)) {
                    SET_COLOR(str, start, i, TIGER_STYLE_KEYWORD);
                    continue;
                }
                if (strfind(syn->types, kbuf)) {
                    SET_COLOR(str, start, i, TIGER_STYLE_TYPE);
                    continue;
                }
                for (j = i; j < n && qe_isspace(str[j]); j++)
                    continue;
                /* function calls use parenthesized argument list or
                   single string or table literal */
                if (str[j] == '(') {
                    SET_COLOR(str, start, i, TIGER_STYLE_FUNCTION);
                    continue;
                }
                continue;
            }
            break;
        }
    }
    cp->colorize_state = state;
}

static ModeDef tiger_mode = {
    .name = "Tiger",
    .extensions = "tiger|tig",
    .shell_handlers = "tiger",
    .keywords = tiger_keywords,
    .types = tiger_types,
    .colorize_func = tiger_colorize_line,
};

static int tiger_init(void)
{
    qe_register_mode(&tiger_mode, MODEF_SYNTAX);

    return 0;
}

qe_module_init(tiger_init);