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/***************************************************************************
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lml.h - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "common.h"
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#include "lml.h"
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#include "log.h"
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#include <stdio.h>
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#include <string.h>
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#include <sys/param.h>
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#define LML_TAG_PARAM_BUF_LEN 256
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#define LML_TAG_OUTPUT_BUF_LEN 1024
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typedef int (*lml_tag_filter_cb)(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len);
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static int lml_tag_color_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
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{
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if (strcasecmp(tag_name, "color") == 0)
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{
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if (strcasecmp(tag_param_buf, "red") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;31m");
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}
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else if (strcasecmp(tag_param_buf, "green") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;32m");
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}
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else if (strcasecmp(tag_param_buf, "yellow") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;33m");
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}
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else if (strcasecmp(tag_param_buf, "blue") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;34m");
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}
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else if (strcasecmp(tag_param_buf, "magenta") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;35m");
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}
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else if (strcasecmp(tag_param_buf, "cyan") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;36m");
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}
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else if (strcasecmp(tag_param_buf, "black") == 0)
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{
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return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;30;47m");
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}
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}
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return 0;
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}
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#define LML_TAG_QUOTE_MAX_LEVEL 10
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#define LML_TAG_QUOTE_LEVEL_LOOP 3
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static const char *lml_tag_quote_color[] = {
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"\033[33m", // yellow
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"\033[32m", // green
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"\033[35m", // magenta
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};
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static int lml_tag_quote_level = 0;
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static int lml_tag_quote_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len)
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{
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if (strcasecmp(tag_name, "quote") == 0)
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{
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if (lml_tag_quote_level <= LML_TAG_QUOTE_MAX_LEVEL)
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{
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lml_tag_quote_level++;
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}
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return snprintf(tag_output_buf, tag_output_buf_len, "%s",
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lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
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}
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else if (strcasecmp(tag_name, "/quote") == 0)
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{
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if (lml_tag_quote_level > 0)
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{
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lml_tag_quote_level--;
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}
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return snprintf(tag_output_buf, tag_output_buf_len, "%s",
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(lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
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}
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return 0;
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}
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const static char *LML_tag_def[][3] = {
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{"left", "[", ""},
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{"right", "]", NULL},
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{"bold", "\033[1m", ""}, // does not work in Fterm
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{"/bold", "\033[22m", NULL},
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{"b", "\033[1m", ""},
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{"/b", "\033[22m", NULL},
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{"italic", "\033[5m", ""}, // use blink instead
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{"/italic", "\033[m", NULL}, // \033[25m does not work in Fterm
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{"i", "\033[5m", ""},
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{"/i", "\033[m", NULL},
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{"underline", "\033[4m", ""},
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{"/underline", "\033[m", NULL}, // \033[24m does not work in Fterm
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{"u", "\033[4m", ""},
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{"/u", "\033[m", NULL},
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{"color", NULL, (const char *)lml_tag_color_filter},
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{"/color", "\033[m", NULL},
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{"quote", NULL, (const char *)lml_tag_quote_filter},
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{"/quote", NULL, (const char *)lml_tag_quote_filter},
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{"url", "", ""},
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{"/url", "(链接: %s)", NULL},
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{"link", "", ""},
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{"/link", "(链接: %s)", NULL},
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{"email", "", ""},
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{"/email", "(Email: %s)", NULL},
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{"user", "", ""},
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{"/user", "(用户: %s)", NULL},
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{"article", "", ""},
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{"/article", "(文章: %s)", NULL},
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{"image", "(图片: %s)", ""},
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{"flash", "(Flash: %s)", ""},
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{"bwf", "\033[1;31m****\033[m", ""},
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};
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#define LML_TAG_COUNT 31
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static int LML_tag_name_len[LML_TAG_COUNT];
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static int LML_init = 0;
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inline static void lml_init(void)
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{
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int i;
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if (!LML_init)
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{
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for (i = 0; i < LML_TAG_COUNT; i++)
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{
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LML_tag_name_len[i] = (int)strlen(LML_tag_def[i][0]);
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}
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LML_init = 1;
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}
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}
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int lml_plain(const char *str_in, char *str_out, int buf_len)
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{
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char c;
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char tag_param_buf[LML_TAG_PARAM_BUF_LEN];
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char tag_output_buf[LML_TAG_OUTPUT_BUF_LEN];
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int i;
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int j = 0;
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int k;
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int tag_start_pos = -1;
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int tag_end_pos = -1;
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int tag_param_pos = -1;
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int tag_output_len;
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int new_line = 1;
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int fb_quote_level = 0;
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lml_init();
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lml_tag_quote_level = 0;
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for (i = 0; str_in[i] != '\0'; i++)
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{
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if (new_line)
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{
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if (fb_quote_level > 0)
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{
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lml_tag_quote_level -= fb_quote_level;
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tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
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(lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
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if (j + tag_output_len >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
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str_out[j] = '\0';
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return j;
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}
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memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
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j += tag_output_len;
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fb_quote_level = 0;
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}
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while (str_in[i + fb_quote_level * 2] == ':' && str_in[i + fb_quote_level * 2 + 1] == ' ') // FB2000 quote leading str
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{
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fb_quote_level++;
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}
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if (fb_quote_level > 0)
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{
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lml_tag_quote_level += fb_quote_level;
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tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
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lml_tag_quote_color[(lml_tag_quote_level) % LML_TAG_QUOTE_LEVEL_LOOP]);
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if (j + tag_output_len >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
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str_out[j] = '\0';
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return j;
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}
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memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
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j += tag_output_len;
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}
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new_line = 0;
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}
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if (str_in[i] == '\033' && str_in[i + 1] == '[') // Escape sequence -- copy directly
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{
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for (k = i + 2; str_in[k] != '\0' && str_in[k] != 'm'; k++)
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;
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if (str_in[k] == 'm') // Valid
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{
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if (j + (k - i + 1) >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %d >= %d\n", j + (k - i + 1), buf_len);
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str_out[j] = '\0';
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return j;
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}
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memcpy(str_out + j, str_in + i, (size_t)(k - i + 1));
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j += (k - i + 1);
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i = k;
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continue;
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}
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else // reach end of string
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{
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break;
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}
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}
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if (str_in[i] == '\n')
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{
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tag_start_pos = -1; // jump out of tag at end of line
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new_line = 1;
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}
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else if (str_in[i] == '\r')
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{
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continue; // ignore '\r'
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}
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if (str_in[i] == '[')
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{
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tag_start_pos = i + 1;
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}
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else if (str_in[i] == ']')
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{
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if (tag_start_pos >= 0)
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{
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tag_end_pos = i;
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// Skip space characters
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while (str_in[tag_start_pos] == ' ')
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{
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tag_start_pos++;
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}
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for (k = 0; k < LML_TAG_COUNT; k++)
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{
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if (strncasecmp(LML_tag_def[k][0], str_in + tag_start_pos, (size_t)LML_tag_name_len[k]) == 0)
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{
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tag_param_pos = -1;
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switch (str_in[tag_start_pos + LML_tag_name_len[k]])
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{
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case ' ':
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tag_param_pos = tag_start_pos + LML_tag_name_len[k] + 1;
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while (str_in[tag_param_pos] == ' ')
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{
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tag_param_pos++;
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}
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strncpy(tag_param_buf, str_in + tag_param_pos, (size_t)MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN));
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tag_param_buf[MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN)] = '\0';
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case ']':
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if (tag_param_pos == -1 && LML_tag_def[k][1] != NULL && LML_tag_def[k][2] != NULL) // Apply default param if not defined
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{
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strncpy(tag_param_buf, LML_tag_def[k][2], LML_TAG_PARAM_BUF_LEN - 1);
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tag_param_buf[LML_TAG_PARAM_BUF_LEN - 1] = '\0';
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}
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if (LML_tag_def[k][1] != NULL)
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{
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tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, LML_tag_def[k][1], tag_param_buf);
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}
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else
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{
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tag_output_len = ((lml_tag_filter_cb)LML_tag_def[k][2])(
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LML_tag_def[k][0], tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN);
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}
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if (j + tag_output_len >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
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str_out[j] = '\0';
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return j;
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}
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memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
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j += tag_output_len;
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break;
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default: // tag_name not match
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continue;
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}
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break;
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}
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}
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tag_start_pos = -1;
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}
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}
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else if (tag_start_pos == -1) // not in LML tag
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{
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if (str_in[i] & 0b10000000) // head of multi-byte character
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{
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if (j + 4 >= buf_len) // Assuming UTF-8 CJK characters use 4 bytes, though most of them actually use 3 bytes
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{
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log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 4, buf_len);
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str_out[j] = '\0';
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return j;
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}
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c = (str_in[i] & 0b01110000) << 1;
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while (c & 0b10000000)
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{
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str_out[j++] = str_in[i++];
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if (str_in[i] == '\0')
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{
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str_out[j] = '\0';
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return j;
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}
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c = (c & 0b01111111) << 1;
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}
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}
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if (j + 1 >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 1, buf_len);
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str_out[j] = '\0';
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return j;
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}
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str_out[j++] = str_in[i];
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}
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else // in LML tag
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{
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// Do nothing
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}
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}
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if (lml_tag_quote_level > 0)
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{
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tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "\033[m");
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if (j + tag_output_len >= buf_len)
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{
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log_error("Buffer is not longer enough for output string %d >= %d\n", j + tag_output_len, buf_len);
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str_out[j] = '\0';
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return j;
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}
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memcpy(str_out + j, tag_output_buf, (size_t)tag_output_len);
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j += tag_output_len;
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}
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str_out[j] = '\0';
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return j;
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}
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