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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, int quote_mode);
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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, int quote_mode)
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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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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 const int LML_TAG_QUOTE_LEVEL_LOOP = (int)(sizeof(lml_tag_quote_color) / sizeof(const char *));
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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, int quote_mode)
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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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static int lml_tag_disabled = 0;
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static int lml_tag_disable_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len, int quote_mode)
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{
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lml_tag_disabled = 1;
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return snprintf(tag_output_buf, tag_output_buf_len, "%s", (quote_mode ? "[plain]" : ""));
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}
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typedef struct lml_tag_def_t
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{
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const char *tag_name; // tag name
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const char *tag_output; // output string
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const char *default_param; // default param string
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const char *quote_mode_output; // output string in quote mode
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lml_tag_filter_cb tag_filter_cb; // tag filter callback
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} LML_TAG_DEF;
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const LML_TAG_DEF lml_tag_def[] = {
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// Definition of tuple: {lml_tag, lml_output, default_param, quote_mode_output, lml_filter_cb}
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{"plain", NULL, NULL, NULL, lml_tag_disable_filter},
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{"nolml", "", NULL, "", NULL}, // deprecated
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{"lml", "", NULL, "", NULL}, // deprecated
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{"align", "", "", "", NULL}, // N/A
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{"/align", "", "", "", NULL}, // N/A
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{"size", "", "", "", NULL}, // N/A
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{"/size", "", "", "", NULL}, // N/A
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{"left", "[", "", "[left]", NULL},
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{"right", "]", "", "[right]", NULL},
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{"bold", "\033[1m", "", "", NULL}, // does not work in Fterm
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{"/bold", "\033[22m", NULL, "", NULL},
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{"b", "\033[1m", "", "", NULL},
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{"/b", "\033[22m", NULL, "", NULL},
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{"italic", "\033[5m", "", "", NULL}, // use blink instead
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{"/italic", "\033[m", NULL, "", NULL}, // \033[25m does not work in Fterm
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{"i", "\033[5m", "", "", NULL},
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{"/i", "\033[m", NULL, "", NULL},
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{"underline", "\033[4m", "", "", NULL},
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{"/underline", "\033[m", NULL, "", NULL}, // \033[24m does not work in Fterm
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{"u", "\033[4m", "", "", NULL},
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{"/u", "\033[m", NULL, "", NULL},
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{"color", NULL, NULL, "", lml_tag_color_filter},
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{"/color", "\033[m", NULL, "", NULL},
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{"quote", NULL, NULL, "", lml_tag_quote_filter},
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{"/quote", NULL, NULL, "", lml_tag_quote_filter},
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{"url", "", "", "", NULL},
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{"/url", "（链接: %s）", NULL, "", NULL},
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{"link", "", "", "", NULL},
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{"/link", "（链接: %s）", NULL, "", NULL},
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{"email", "", "", "", NULL},
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{"/email", "（Email: %s）", NULL, "", NULL},
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{"user", "", "", "", NULL},
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{"/user", "（用户: %s）", NULL, "", NULL},
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{"article", "", "", "", NULL},
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{"/article", "（文章: %s）", NULL, "", NULL},
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{"image", "（图片: %s）", "", "%s", NULL},
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{"flash", "（Flash: %s）", "", "", NULL},
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{"bwf", "\033[1;31m****\033[m", "", "****", NULL},
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};
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#define LML_TAG_COUNT (sizeof(lml_tag_def) / sizeof(LML_TAG_DEF))
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static int lml_tag_name_len[LML_TAG_COUNT];
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static int lml_ready = 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_ready)
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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].tag_name);
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}
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lml_ready = 1;
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}
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}
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#define CHECK_AND_APPEND_OUTPUT(out_buf, out_buf_len, out_buf_offset, tag_out, tag_out_len) \
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{ \
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if ((out_buf_offset) + (tag_out_len) >= (out_buf_len)) \
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{ \
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log_error("Buffer is not longer enough for output string %d >= %d\n", (out_buf_offset) + (tag_out_len), (out_buf_len)); \
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out_buf[out_buf_offset] = '\0'; \
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return (out_buf_offset); \
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} \
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memcpy((out_buf) + (out_buf_offset), (tag_out), (size_t)(tag_out_len)); \
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(out_buf_offset) += (tag_out_len); \
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}
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int lml_render(const char *str_in, char *str_out, int buf_len, int quote_mode)
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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_name_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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int tag_name_found;
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lml_init();
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lml_tag_disabled = 0;
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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 (!quote_mode && !lml_tag_disabled && new_line)
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{
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fb_quote_level = 0;
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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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lml_tag_quote_level += fb_quote_level;
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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, "%s",
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lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
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CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, 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' && str_in[k] != '\033'; k++)
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;
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if (str_in[k] != 'm') // invalid
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{
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k--;
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}
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CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + i, k - i + 1);
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i = k;
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continue;
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}
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if (str_in[i] == '\n') // jump out of tag at end of line
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{
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if (tag_start_pos != -1) // tag is not closed
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{
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tag_end_pos = i - 1;
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tag_output_len = tag_end_pos - tag_start_pos + 1;
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CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + tag_start_pos, tag_output_len);
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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, "\033[m");
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CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len);
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}
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tag_start_pos = -1;
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tag_name_pos = -1;
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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 (!lml_tag_disabled && str_in[i] == '[')
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{
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if (tag_start_pos != -1) // tag is not closed
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{
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tag_end_pos = i - 1;
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tag_output_len = tag_end_pos - tag_start_pos + 1;
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CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + tag_start_pos, tag_output_len);
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}
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tag_start_pos = i;
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tag_name_pos = i + 1;
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}
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else if (!lml_tag_disabled && str_in[i] == ']' && tag_name_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_name_pos] == ' ')
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{
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tag_name_pos++;
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}
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for (tag_name_found = 0, k = 0; k < LML_TAG_COUNT; k++)
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{
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if (strncasecmp(lml_tag_def[k].tag_name, str_in + tag_name_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_name_pos + lml_tag_name_len[k]])
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{
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case ' ':
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tag_name_found = 1;
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tag_param_pos = tag_name_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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tag_name_found = 1;
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if (tag_param_pos == -1 && lml_tag_def[k].tag_output != NULL && lml_tag_def[k].default_param != NULL) // Apply default param if not defined
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{
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strncpy(tag_param_buf, lml_tag_def[k].default_param, 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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tag_output_len = 0;
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if (!quote_mode)
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{
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if (lml_tag_def[k].tag_output != 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].tag_output, tag_param_buf);
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}
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else if (lml_tag_def[k].tag_filter_cb != NULL)
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{
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tag_output_len = lml_tag_def[k].tag_filter_cb(
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lml_tag_def[k].tag_name, tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, 0);
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| 335 |
}
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| 336 |
}
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| 337 |
else // if (quote_mode)
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{
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| 339 |
if (lml_tag_def[k].quote_mode_output != 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].quote_mode_output, tag_param_buf);
|
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}
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| 343 |
else if (lml_tag_def[k].tag_filter_cb != NULL)
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{
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tag_output_len = lml_tag_def[k].tag_filter_cb(
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lml_tag_def[k].tag_name, tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, 1);
|
| 347 |
}
|
| 348 |
}
|
| 349 |
CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len);
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break;
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| 351 |
default: // tag_name not match
|
| 352 |
continue;
|
| 353 |
}
|
| 354 |
break;
|
| 355 |
}
|
| 356 |
}
|
| 357 |
|
| 358 |
if (!tag_name_found)
|
| 359 |
{
|
| 360 |
tag_output_len = tag_end_pos - tag_start_pos + 1;
|
| 361 |
CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + tag_start_pos, tag_output_len);
|
| 362 |
}
|
| 363 |
|
| 364 |
tag_start_pos = -1;
|
| 365 |
tag_name_pos = -1;
|
| 366 |
}
|
| 367 |
else if (lml_tag_disabled || tag_name_pos == -1) // not in LML tag
|
| 368 |
{
|
| 369 |
if (str_in[i] & 0x80) // head of multi-byte character
|
| 370 |
{
|
| 371 |
if (j + 4 >= buf_len) // Assuming UTF-8 CJK characters use 4 bytes, though most of them actually use 3 bytes
|
| 372 |
{
|
| 373 |
log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 4, buf_len);
|
| 374 |
str_out[j] = '\0';
|
| 375 |
return j;
|
| 376 |
}
|
| 377 |
|
| 378 |
c = (str_in[i] & 0x70) << 1;
|
| 379 |
while (c & 0x80)
|
| 380 |
{
|
| 381 |
str_out[j++] = str_in[i++];
|
| 382 |
if (str_in[i] == '\0')
|
| 383 |
{
|
| 384 |
str_out[j] = '\0';
|
| 385 |
return j;
|
| 386 |
}
|
| 387 |
c = (c & 0x7f) << 1;
|
| 388 |
}
|
| 389 |
}
|
| 390 |
|
| 391 |
if (j + 1 >= buf_len)
|
| 392 |
{
|
| 393 |
log_error("Buffer is not longer enough for output string %ld >= %d\n", j + 1, buf_len);
|
| 394 |
str_out[j] = '\0';
|
| 395 |
return j;
|
| 396 |
}
|
| 397 |
str_out[j++] = str_in[i];
|
| 398 |
}
|
| 399 |
else // in LML tag
|
| 400 |
{
|
| 401 |
// Do nothing
|
| 402 |
}
|
| 403 |
}
|
| 404 |
|
| 405 |
if (tag_start_pos != -1) // tag is not closed
|
| 406 |
{
|
| 407 |
tag_end_pos = i - 1;
|
| 408 |
tag_output_len = tag_end_pos - tag_start_pos + 1;
|
| 409 |
CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + tag_start_pos, tag_output_len);
|
| 410 |
}
|
| 411 |
|
| 412 |
if (!quote_mode && !lml_tag_disabled && lml_tag_quote_level > 0)
|
| 413 |
{
|
| 414 |
tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "\033[m");
|
| 415 |
CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len);
|
| 416 |
}
|
| 417 |
|
| 418 |
str_out[j] = '\0';
|
| 419 |
|
| 420 |
return j;
|
| 421 |
}
|
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