Does not support tables (patch included)

[bztsrc]

Hi,

I couldn't find the very much needed table support, so I've added a Parser for it. It is using a minimalistic state-machine in the spirit of simplicity. Known issues:

1. you have to add it before the doparagraph parser, otherwise your tables will be surrounded by <p></p>
2. only handles 32 coloumns' alignments (more supported, just always will be left-aligned)
3. it does not right-trim the table cells. Implementing this would require lot more complexity, and I've thought simplicity is more important here.

Supports normal coloumns, |---|, right aligned |--:| and centered |:-:|. Licensed under MIT, use it as you wish.

/* smu table parser, Copyright(C) bzt 2022 MIT */

static char intable = 0, inrow, incell;                         /* table state */
static long int calign;

int
dotable(const char *begin, const char *end, int newblock) {
    const char *p;
    int i, l = (int)sizeof(calign) * 4;

    if(*begin != '|')
        return 0;
    if(inrow && (begin + 1 >= end || begin[1] == '\n')) {       /* close cell and row and if ends, table too */
        fprintf(stdout, "</t%c></tr>", inrow == -1 ? 'h' : 'd');
        inrow = 0;
        if(begin + 2 >= end || begin[2] == '\n') {
            intable = 0;
            fputs("\n</table>", stdout);
            return 2;
        }
        return 1;
    }
    if(begin < end && (begin[1] == '-' || begin[1] == ':')) {   /* only load cell aligns from 2nd line */
        for(i = -1, p = begin; p < end && *p != '\n'; p++)
            if(*p == '|') {
                i++;
                if(i < l && p[1] == ':') {
                    calign |= 1 << (i * 2); p++;
                }
            } else
            if(i < l && *p == ':')
                calign |= 1 << (i * 2 + 1);
        return p - begin + 1;
    }
    if(!intable) {                                              /* open table */
        intable = 1; inrow = -1; incell = 0; calign = 0;
        fputs("<table>\n<tr>", stdout);
    }
    if(!inrow) {                                                /* open row */
        inrow = 1; incell = 0;
        fputs("<tr>", stdout);
    }
    if(incell)                                                  /* close cell */
        fprintf(stdout, "</t%c>", inrow == -1 ? 'h' : 'd');
    l = incell < l ? (calign >> (incell * 2)) & 3 : 0;          /* open cell */
    fprintf(stdout, "<t%c%s>", inrow == -1 ? 'h' : 'd',
        l == 2 ? " class=\"right\"" : (l == 3 ? " class=\"center\"" : ""));
    incell++;
    for(p = begin + 1; p < end && *p == ' '; p++);
    return p - begin;
}

Cheers,
bzt