path: root/src/html/html.c

#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>

#include "stmd.h"
#include "debug.h"
#include "scanners.h"
#include "html/houdini.h"

// Functions to convert block and inline lists to HTML strings.

static void escape_html(gh_buf *dest, const unsigned char *source, int length)
{
    if (length < 0)
        length = strlen((char *)source);

    houdini_escape_html0(dest, source, (size_t)length, 0);
}

static void escape_href(gh_buf *dest, const unsigned char *source, int length)
{
    if (length < 0)
        length = strlen((char *)source);

    houdini_escape_href(dest, source, (size_t)length);
}

static inline void cr(gh_buf *html)
{
    if (html->size && html->ptr[html->size - 1] != '\n')
        gh_buf_putc(html, '\n');
}

// Convert a block list to HTML.  Returns 0 on success, and sets result.
void blocks_to_html(gh_buf *html, block *b, bool tight)
{
    struct ListData *data;

    while(b != NULL) {
        switch(b->tag) {
            case document:
                blocks_to_html(html, b->children, false);
                break;

            case paragraph:
                if (tight) {
                    inlines_to_html(html, b->inline_content);
                } else {
                    cr(html);
                    gh_buf_puts(html, "<p>");
                    inlines_to_html(html, b->inline_content);
                    gh_buf_puts(html, "</p>");
                    cr(html);
                }
                break;

            case block_quote:
                cr(html);
                gh_buf_puts(html, "<blockquote>");
                blocks_to_html(html, b->children, false);
                gh_buf_puts(html, "</blockquote>");
                cr(html);
                break;

            case list_item:
                cr(html);
                gh_buf_puts(html, "<li>");
                blocks_to_html(html, b->children, tight);
                gh_buf_trim(html);
                gh_buf_puts(html, "</li>");
                cr(html);
                break;

            case list:
                // make sure a list starts at the beginning of the line:
                cr(html);
                data = &(b->attributes.list_data);

                if (data->start > 1) {
                    gh_buf_printf(html, "<%s start=\"%d\">\n",
                            data->list_type == bullet ? "ul" : "ol",
                            data->start);
                } else {
                    gh_buf_puts(html, data->list_type == bullet ? "<ul>\n" : "<ol>\n");
                }

                blocks_to_html(html, b->children, data->tight);
                gh_buf_puts(html, data->list_type == bullet ? "</ul>" : "</ol>");
                cr(html);
                break;

            case atx_header:
            case setext_header:
                cr(html);
                gh_buf_printf(html, "<h%d>", b->attributes.header_level);
                inlines_to_html(html, b->inline_content);
                gh_buf_printf(html, "</h%d>", b->attributes.header_level);
                cr(html);
                break;

            case indented_code:
            case fenced_code:
                /* TODO: fenced code lang attributes */
                cr(html);
                gh_buf_puts(html, "<pre><code>");
                escape_html(html, b->string_content.ptr, b->string_content.size);
                gh_buf_puts(html, "</pre></code>");
                cr(html);
                break;

            case html_block:
                gh_buf_put(html, b->string_content.ptr, b->string_content.size);
                break;

            case hrule:
                gh_buf_puts(html, "<hr />");
                cr(html);
                break;

            case reference_def:
                break;

            default:
                assert(false);
        }

        b = b->next;
    }
}

// Convert an inline list to HTML.  Returns 0 on success, and sets result.
void inlines_to_html(gh_buf *html, inl* ils)
{
    gh_buf scrap = GH_BUF_INIT;

    while(ils != NULL) {
        switch(ils->tag) {
            case INL_STRING:
                escape_html(html, ils->content.literal.data, ils->content.literal.len);
                break;

            case INL_LINEBREAK:
                gh_buf_puts(html, "<br />\n");
                break;

            case INL_SOFTBREAK:
                gh_buf_putc(html, '\n');
                break;

            case INL_CODE:
                gh_buf_puts(html, "<code>");
                escape_html(html, ils->content.literal.data, ils->content.literal.len);
                gh_buf_puts(html, "</code>");
                break;

            case INL_RAW_HTML:
            case INL_ENTITY:
                gh_buf_put(html,
                        ils->content.literal.data,
                        ils->content.literal.len);
                break;

            case INL_LINK:
                gh_buf_puts(html, "<a href=\"");
                escape_href(html, ils->content.linkable.url, -1);

                if (ils->content.linkable.title) {
                    gh_buf_puts(html, "\" title=\"");
                    escape_html(html, ils->content.linkable.title, -1);
                }

                gh_buf_puts(html, "\">");
                inlines_to_html(html, ils->content.inlines);
                gh_buf_puts(html, "</a>");
                break;

            case INL_IMAGE:
                gh_buf_puts(html, "<img src=\"");
                escape_href(html, ils->content.linkable.url, -1);

                inlines_to_html(&scrap, ils->content.inlines);
                if (scrap.size) {
                    gh_buf_puts(html, "\" alt=\"");
                    escape_html(html, scrap.ptr, scrap.size);
                }
                gh_buf_clear(&scrap);

                if (ils->content.linkable.title) {
                    gh_buf_puts(html, "\" title=\"");
                    escape_html(html, ils->content.linkable.title, -1);
                }

                gh_buf_puts(html, "\"/>");
                break;

            case INL_STRONG:
                gh_buf_puts(html, "<strong>");
                inlines_to_html(html, ils->content.inlines);
                gh_buf_puts(html, "</strong>");
                break;

            case INL_EMPH:
                gh_buf_puts(html, "<em>");
                inlines_to_html(html, ils->content.inlines);
                gh_buf_puts(html, "</em>");
                break;
        }
        ils = ils->next;
    }
}