diff options
Diffstat (limited to 'adapter/format/gmi2html.c')
| -rw-r--r-- | adapter/format/gmi2html.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/adapter/format/gmi2html.c b/adapter/format/gmi2html.c new file mode 100644 index 00000000..2c8c2bf6 --- /dev/null +++ b/adapter/format/gmi2html.c @@ -0,0 +1,241 @@ +/* This file is dedicated to the public domain. + * + * Convert gemtext to HTML. Only accepts input on stdin. + */ + +#include <stdio.h> +#include <stdlib.h> + +typedef enum { + STATE_NORMAL, + STATE_BLOCKQUOTE, + STATE_NEWLINE, + STATE_NEWLINE_EQUALS, + STATE_NEWLINE_EQUALS_ARROW, + STATE_BEFORE_URL, + STATE_IN_URL, + STATE_BEFORE_URL_NAME, + STATE_URL_NAME, + STATE_SINGLE_BACKTICK, + STATE_DOUBLE_BACKTICK, + STATE_PRE_START, + STATE_IN_PRE, + STATE_PRE_SINGLE_BACKTICK, + STATE_PRE_DOUBLE_BACKTICK, + STATE_SKIP_LINE, + STATE_HASH, + STATE_DOUBLE_HASH, + STATE_AFTER_HASH, + STATE_AFTER_DOUBLE_HASH, + STATE_AFTER_TRIPLE_HASH +} ParseState; + +static ParseState state = STATE_NEWLINE; +static ParseState prev_state = STATE_NORMAL; + +int main(void) { + int c; +#define BUFSIZE 4096 + char urlbuf[BUFSIZE + 1]; + char *urlp; + + urlp = urlbuf; + printf("<!DOCTYPE html>"); +#define SET_STATE(s) do { \ + prev_state = state; \ + state = s; \ + } while (0) +#define REDO_NORMAL do { \ + SET_STATE(STATE_NORMAL); \ + goto normal; \ + } while (0) + while ((c = getc(stdin)) != EOF) { + switch (state) { + case STATE_NORMAL: + case STATE_BLOCKQUOTE: + case STATE_IN_PRE: + case STATE_PRE_START: + case STATE_SKIP_LINE: + case STATE_URL_NAME: + case STATE_AFTER_HASH: + case STATE_AFTER_DOUBLE_HASH: + case STATE_AFTER_TRIPLE_HASH: +normal: switch (c) { + case '\r': break; + case '\n': + if (state == STATE_BLOCKQUOTE) { + fputs("</blockquote>", stdout); + } else if (state == STATE_PRE_START) { + fputs("\">", stdout); + SET_STATE(STATE_IN_PRE); + } else if (state == STATE_URL_NAME) { + fputs("</a>", stdout); + fputs("<br>", stdout); + } else if (state == STATE_AFTER_HASH) { + fputs("</h1>", stdout); + } else if (state == STATE_AFTER_DOUBLE_HASH) { + fputs("</h2>", stdout); + } else if (state == STATE_AFTER_TRIPLE_HASH) { + fputs("</h3>", stdout); + } else if (state == STATE_SKIP_LINE) { + } else { + fputs("<br>", stdout); + } + SET_STATE(STATE_NEWLINE); + break; + case '<': + fputs("<", stdout); + break; + case '>': + fputs(">", stdout); + break; + case '&': + fputs("&", stdout); + break; + default: + if (state != STATE_SKIP_LINE) + putchar(c); + break; + } + break; + case STATE_NEWLINE: + if (prev_state == STATE_IN_PRE) { + if (c == '`') { + SET_STATE(STATE_PRE_SINGLE_BACKTICK); + break; + } else { + SET_STATE(STATE_IN_PRE); + goto normal; + } + } + switch (c) { + case '=': + SET_STATE(STATE_NEWLINE_EQUALS); + break; + case '>': + SET_STATE(STATE_BLOCKQUOTE); + printf("<blockquote>"); + break; + case '`': + SET_STATE(STATE_SINGLE_BACKTICK); + break; + case '#': + SET_STATE(STATE_HASH); + break; + default: + REDO_NORMAL; + } + break; + case STATE_NEWLINE_EQUALS: + if (c == '>') { + SET_STATE(STATE_NEWLINE_EQUALS_ARROW); + } else { + putchar('='); + REDO_NORMAL; + } + break; + case STATE_NEWLINE_EQUALS_ARROW: + if (c == ' ') { + state = STATE_BEFORE_URL; + } else { + putchar('='); + REDO_NORMAL; + } + break; + case STATE_BEFORE_URL: + if (c == ' ') { + continue; + break; + } else { + fputs("<a href=\"", stdout); + SET_STATE(STATE_IN_URL); + urlp = urlbuf; + } + /* fall through */ + case STATE_IN_URL: + switch (c) { + case '"': + fputs("%22", stdout); + if (urlp < &urlbuf[BUFSIZE]) + *urlp++ = '"'; + break; + case ' ': + case '\t': + fputs("\">", stdout); + *urlp = '\0'; + SET_STATE(STATE_BEFORE_URL_NAME); + break; + case '\n': + *urlp = '\0'; + fputs("\">", stdout); + fputs(urlbuf, stdout); + fputs("</a><br>", stdout); + SET_STATE(STATE_NEWLINE); + break; + default: + if (urlp < &urlbuf[BUFSIZE] && c != '>' + && c != '<') + *urlp++ = c; + putchar(c); + } + break; + case STATE_BEFORE_URL_NAME: + if (c != ' ' && c != '\t') { + SET_STATE(STATE_URL_NAME); + goto normal; + } + break; + case STATE_SINGLE_BACKTICK: + case STATE_PRE_SINGLE_BACKTICK: + if (c == '`') { + SET_STATE(state == STATE_SINGLE_BACKTICK ? + STATE_DOUBLE_BACKTICK : + STATE_PRE_DOUBLE_BACKTICK); + } else { + putchar('`'); + REDO_NORMAL; + } + break; + case STATE_DOUBLE_BACKTICK: + case STATE_PRE_DOUBLE_BACKTICK: + if (c == '`') { + if (state == STATE_DOUBLE_BACKTICK) { + SET_STATE(STATE_PRE_START); + fputs("<pre title=\"", stdout); + } else { + fputs("</pre>", stdout); + SET_STATE(STATE_SKIP_LINE); + } + } else { + fputs("``", stdout); + if (state == STATE_DOUBLE_BACKTICK) { + REDO_NORMAL; + } else { + SET_STATE(STATE_IN_PRE); + goto normal; + } + } + break; + case STATE_HASH: + if (c == '#') { + SET_STATE(STATE_DOUBLE_HASH); + } else { + fputs("<h1>", stdout); + SET_STATE(STATE_AFTER_HASH); + goto normal; + } + break; + case STATE_DOUBLE_HASH: + if (c == '#') { + fputs("<h3>", stdout); + SET_STATE(STATE_AFTER_TRIPLE_HASH); + } else { + fputs("<h2>", stdout); + SET_STATE(STATE_AFTER_DOUBLE_HASH); + goto normal; + } + break; + } + } + exit(0); +} |