diff options
Diffstat (limited to 'libraries/hoedown/src/html.c')
| -rw-r--r-- | libraries/hoedown/src/html.c | 754 |
1 files changed, 754 insertions, 0 deletions
diff --git a/libraries/hoedown/src/html.c b/libraries/hoedown/src/html.c new file mode 100644 index 00000000..4b18d804 --- /dev/null +++ b/libraries/hoedown/src/html.c @@ -0,0 +1,754 @@ +#include "hoedown/html.h" + +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <ctype.h> + +#include "hoedown/escape.h" + +#define USE_XHTML(opt) (opt->flags & HOEDOWN_HTML_USE_XHTML) + +hoedown_html_tag +hoedown_html_is_tag(const uint8_t *data, size_t size, const char *tagname) +{ + size_t i; + int closed = 0; + + if (size < 3 || data[0] != '<') + return HOEDOWN_HTML_TAG_NONE; + + i = 1; + + if (data[i] == '/') { + closed = 1; + i++; + } + + for (; i < size; ++i, ++tagname) { + if (*tagname == 0) + break; + + if (data[i] != *tagname) + return HOEDOWN_HTML_TAG_NONE; + } + + if (i == size) + return HOEDOWN_HTML_TAG_NONE; + + if (isspace(data[i]) || data[i] == '>') + return closed ? HOEDOWN_HTML_TAG_CLOSE : HOEDOWN_HTML_TAG_OPEN; + + return HOEDOWN_HTML_TAG_NONE; +} + +static void escape_html(hoedown_buffer *ob, const uint8_t *source, size_t length) +{ + hoedown_escape_html(ob, source, length, 0); +} + +static void escape_href(hoedown_buffer *ob, const uint8_t *source, size_t length) +{ + hoedown_escape_href(ob, source, length); +} + +/******************** + * GENERIC RENDERER * + ********************/ +static int +rndr_autolink(hoedown_buffer *ob, const hoedown_buffer *link, hoedown_autolink_type type, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + if (!link || !link->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<a href=\""); + if (type == HOEDOWN_AUTOLINK_EMAIL) + HOEDOWN_BUFPUTSL(ob, "mailto:"); + escape_href(ob, link->data, link->size); + + if (state->link_attributes) { + hoedown_buffer_putc(ob, '\"'); + state->link_attributes(ob, link, data); + hoedown_buffer_putc(ob, '>'); + } else { + HOEDOWN_BUFPUTSL(ob, "\">"); + } + + /* + * Pretty printing: if we get an email address as + * an actual URI, e.g. `mailto:foo@bar.com`, we don't + * want to print the `mailto:` prefix + */ + if (hoedown_buffer_prefix(link, "mailto:") == 0) { + escape_html(ob, link->data + 7, link->size - 7); + } else { + escape_html(ob, link->data, link->size); + } + + HOEDOWN_BUFPUTSL(ob, "</a>"); + + return 1; +} + +static void +rndr_blockcode(hoedown_buffer *ob, const hoedown_buffer *text, const hoedown_buffer *lang, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + + if (lang) { + HOEDOWN_BUFPUTSL(ob, "<pre><code class=\"language-"); + escape_html(ob, lang->data, lang->size); + HOEDOWN_BUFPUTSL(ob, "\">"); + } else { + HOEDOWN_BUFPUTSL(ob, "<pre><code>"); + } + + if (text) + escape_html(ob, text->data, text->size); + + HOEDOWN_BUFPUTSL(ob, "</code></pre>\n"); +} + +static void +rndr_blockquote(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + HOEDOWN_BUFPUTSL(ob, "<blockquote>\n"); + if (content) hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</blockquote>\n"); +} + +static int +rndr_codespan(hoedown_buffer *ob, const hoedown_buffer *text, const hoedown_renderer_data *data) +{ + HOEDOWN_BUFPUTSL(ob, "<code>"); + if (text) escape_html(ob, text->data, text->size); + HOEDOWN_BUFPUTSL(ob, "</code>"); + return 1; +} + +static int +rndr_strikethrough(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<del>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</del>"); + return 1; +} + +static int +rndr_double_emphasis(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<strong>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</strong>"); + + return 1; +} + +static int +rndr_emphasis(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) return 0; + HOEDOWN_BUFPUTSL(ob, "<em>"); + if (content) hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</em>"); + return 1; +} + +static int +rndr_underline(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<u>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</u>"); + + return 1; +} + +static int +rndr_highlight(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<mark>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</mark>"); + + return 1; +} + +static int +rndr_quote(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) + return 0; + + HOEDOWN_BUFPUTSL(ob, "<q>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</q>"); + + return 1; +} + +static int +rndr_linebreak(hoedown_buffer *ob, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + hoedown_buffer_puts(ob, USE_XHTML(state) ? "<br/>\n" : "<br>\n"); + return 1; +} + +static void +rndr_header(hoedown_buffer *ob, const hoedown_buffer *content, int level, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + if (ob->size) + hoedown_buffer_putc(ob, '\n'); + + if (level <= state->toc_data.nesting_level) + hoedown_buffer_printf(ob, "<h%d id=\"toc_%d\">", level, state->toc_data.header_count++); + else + hoedown_buffer_printf(ob, "<h%d>", level); + + if (content) hoedown_buffer_put(ob, content->data, content->size); + hoedown_buffer_printf(ob, "</h%d>\n", level); +} + +static int +rndr_link(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_buffer *link, const hoedown_buffer *title, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + HOEDOWN_BUFPUTSL(ob, "<a href=\""); + + if (link && link->size) + escape_href(ob, link->data, link->size); + + if (title && title->size) { + HOEDOWN_BUFPUTSL(ob, "\" title=\""); + escape_html(ob, title->data, title->size); + } + + if (state->link_attributes) { + hoedown_buffer_putc(ob, '\"'); + state->link_attributes(ob, link, data); + hoedown_buffer_putc(ob, '>'); + } else { + HOEDOWN_BUFPUTSL(ob, "\">"); + } + + if (content && content->size) hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</a>"); + return 1; +} + +static void +rndr_list(hoedown_buffer *ob, const hoedown_buffer *content, hoedown_list_flags flags, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + hoedown_buffer_put(ob, (const uint8_t *)(flags & HOEDOWN_LIST_ORDERED ? "<ol>\n" : "<ul>\n"), 5); + if (content) hoedown_buffer_put(ob, content->data, content->size); + hoedown_buffer_put(ob, (const uint8_t *)(flags & HOEDOWN_LIST_ORDERED ? "</ol>\n" : "</ul>\n"), 6); +} + +static void +rndr_listitem(hoedown_buffer *ob, const hoedown_buffer *content, hoedown_list_flags flags, const hoedown_renderer_data *data) +{ + HOEDOWN_BUFPUTSL(ob, "<li>"); + if (content) { + size_t size = content->size; + while (size && content->data[size - 1] == '\n') + size--; + + hoedown_buffer_put(ob, content->data, size); + } + HOEDOWN_BUFPUTSL(ob, "</li>\n"); +} + +static void +rndr_paragraph(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + size_t i = 0; + + if (ob->size) hoedown_buffer_putc(ob, '\n'); + + if (!content || !content->size) + return; + + while (i < content->size && isspace(content->data[i])) i++; + + if (i == content->size) + return; + + HOEDOWN_BUFPUTSL(ob, "<p>"); + if (state->flags & HOEDOWN_HTML_HARD_WRAP) { + size_t org; + while (i < content->size) { + org = i; + while (i < content->size && content->data[i] != '\n') + i++; + + if (i > org) + hoedown_buffer_put(ob, content->data + org, i - org); + + /* + * do not insert a line break if this newline + * is the last character on the paragraph + */ + if (i >= content->size - 1) + break; + + rndr_linebreak(ob, data); + i++; + } + } else { + hoedown_buffer_put(ob, content->data + i, content->size - i); + } + HOEDOWN_BUFPUTSL(ob, "</p>\n"); +} + +static void +rndr_raw_block(hoedown_buffer *ob, const hoedown_buffer *text, const hoedown_renderer_data *data) +{ + size_t org, sz; + + if (!text) + return; + + /* FIXME: Do we *really* need to trim the HTML? How does that make a difference? */ + sz = text->size; + while (sz > 0 && text->data[sz - 1] == '\n') + sz--; + + org = 0; + while (org < sz && text->data[org] == '\n') + org++; + + if (org >= sz) + return; + + if (ob->size) + hoedown_buffer_putc(ob, '\n'); + + hoedown_buffer_put(ob, text->data + org, sz - org); + hoedown_buffer_putc(ob, '\n'); +} + +static int +rndr_triple_emphasis(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) return 0; + HOEDOWN_BUFPUTSL(ob, "<strong><em>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</em></strong>"); + return 1; +} + +static void +rndr_hrule(hoedown_buffer *ob, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + if (ob->size) hoedown_buffer_putc(ob, '\n'); + hoedown_buffer_puts(ob, USE_XHTML(state) ? "<hr/>\n" : "<hr>\n"); +} + +static int +rndr_image(hoedown_buffer *ob, const hoedown_buffer *link, const hoedown_buffer *title, const hoedown_buffer *alt, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + if (!link || !link->size) return 0; + + HOEDOWN_BUFPUTSL(ob, "<img src=\""); + escape_href(ob, link->data, link->size); + HOEDOWN_BUFPUTSL(ob, "\" alt=\""); + + if (alt && alt->size) + escape_html(ob, alt->data, alt->size); + + if (title && title->size) { + HOEDOWN_BUFPUTSL(ob, "\" title=\""); + escape_html(ob, title->data, title->size); } + + hoedown_buffer_puts(ob, USE_XHTML(state) ? "\"/>" : "\">"); + return 1; +} + +static int +rndr_raw_html(hoedown_buffer *ob, const hoedown_buffer *text, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + /* ESCAPE overrides SKIP_HTML. It doesn't look to see if + * there are any valid tags, just escapes all of them. */ + if((state->flags & HOEDOWN_HTML_ESCAPE) != 0) { + escape_html(ob, text->data, text->size); + return 1; + } + + if ((state->flags & HOEDOWN_HTML_SKIP_HTML) != 0) + return 1; + + hoedown_buffer_put(ob, text->data, text->size); + return 1; +} + +static void +rndr_table(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + HOEDOWN_BUFPUTSL(ob, "<table>\n"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</table>\n"); +} + +static void +rndr_table_header(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + HOEDOWN_BUFPUTSL(ob, "<thead>\n"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</thead>\n"); +} + +static void +rndr_table_body(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (ob->size) hoedown_buffer_putc(ob, '\n'); + HOEDOWN_BUFPUTSL(ob, "<tbody>\n"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</tbody>\n"); +} + +static void +rndr_tablerow(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + HOEDOWN_BUFPUTSL(ob, "<tr>\n"); + if (content) hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</tr>\n"); +} + +static void +rndr_tablecell(hoedown_buffer *ob, const hoedown_buffer *content, hoedown_table_flags flags, const hoedown_renderer_data *data) +{ + if (flags & HOEDOWN_TABLE_HEADER) { + HOEDOWN_BUFPUTSL(ob, "<th"); + } else { + HOEDOWN_BUFPUTSL(ob, "<td"); + } + + switch (flags & HOEDOWN_TABLE_ALIGNMASK) { + case HOEDOWN_TABLE_ALIGN_CENTER: + HOEDOWN_BUFPUTSL(ob, " style=\"text-align: center\">"); + break; + + case HOEDOWN_TABLE_ALIGN_LEFT: + HOEDOWN_BUFPUTSL(ob, " style=\"text-align: left\">"); + break; + + case HOEDOWN_TABLE_ALIGN_RIGHT: + HOEDOWN_BUFPUTSL(ob, " style=\"text-align: right\">"); + break; + + default: + HOEDOWN_BUFPUTSL(ob, ">"); + } + + if (content) + hoedown_buffer_put(ob, content->data, content->size); + + if (flags & HOEDOWN_TABLE_HEADER) { + HOEDOWN_BUFPUTSL(ob, "</th>\n"); + } else { + HOEDOWN_BUFPUTSL(ob, "</td>\n"); + } +} + +static int +rndr_superscript(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (!content || !content->size) return 0; + HOEDOWN_BUFPUTSL(ob, "<sup>"); + hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</sup>"); + return 1; +} + +static void +rndr_normal_text(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + if (content) + escape_html(ob, content->data, content->size); +} + +static void +rndr_footnotes(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + if (ob->size) hoedown_buffer_putc(ob, '\n'); + HOEDOWN_BUFPUTSL(ob, "<div class=\"footnotes\">\n"); + hoedown_buffer_puts(ob, USE_XHTML(state) ? "<hr/>\n" : "<hr>\n"); + HOEDOWN_BUFPUTSL(ob, "<ol>\n"); + + if (content) hoedown_buffer_put(ob, content->data, content->size); + + HOEDOWN_BUFPUTSL(ob, "\n</ol>\n</div>\n"); +} + +static void +rndr_footnote_def(hoedown_buffer *ob, const hoedown_buffer *content, unsigned int num, const hoedown_renderer_data *data) +{ + size_t i = 0; + int pfound = 0; + + /* insert anchor at the end of first paragraph block */ + if (content) { + while ((i+3) < content->size) { + if (content->data[i++] != '<') continue; + if (content->data[i++] != '/') continue; + if (content->data[i++] != 'p' && content->data[i] != 'P') continue; + if (content->data[i] != '>') continue; + i -= 3; + pfound = 1; + break; + } + } + + hoedown_buffer_printf(ob, "\n<li id=\"fn%d\">\n", num); + if (pfound) { + hoedown_buffer_put(ob, content->data, i); + hoedown_buffer_printf(ob, " <a href=\"#fnref%d\" rev=\"footnote\">↩</a>", num); + hoedown_buffer_put(ob, content->data + i, content->size - i); + } else if (content) { + hoedown_buffer_put(ob, content->data, content->size); + } + HOEDOWN_BUFPUTSL(ob, "</li>\n"); +} + +static int +rndr_footnote_ref(hoedown_buffer *ob, unsigned int num, const hoedown_renderer_data *data) +{ + hoedown_buffer_printf(ob, "<sup id=\"fnref%d\"><a href=\"#fn%d\" rel=\"footnote\">%d</a></sup>", num, num, num); + return 1; +} + +static int +rndr_math(hoedown_buffer *ob, const hoedown_buffer *text, int displaymode, const hoedown_renderer_data *data) +{ + hoedown_buffer_put(ob, (const uint8_t *)(displaymode ? "\\[" : "\\("), 2); + escape_html(ob, text->data, text->size); + hoedown_buffer_put(ob, (const uint8_t *)(displaymode ? "\\]" : "\\)"), 2); + return 1; +} + +static void +toc_header(hoedown_buffer *ob, const hoedown_buffer *content, int level, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state = data->opaque; + + if (level <= state->toc_data.nesting_level) { + /* set the level offset if this is the first header + * we're parsing for the document */ + if (state->toc_data.current_level == 0) + state->toc_data.level_offset = level - 1; + + level -= state->toc_data.level_offset; + + if (level > state->toc_data.current_level) { + while (level > state->toc_data.current_level) { + HOEDOWN_BUFPUTSL(ob, "<ul>\n<li>\n"); + state->toc_data.current_level++; + } + } else if (level < state->toc_data.current_level) { + HOEDOWN_BUFPUTSL(ob, "</li>\n"); + while (level < state->toc_data.current_level) { + HOEDOWN_BUFPUTSL(ob, "</ul>\n</li>\n"); + state->toc_data.current_level--; + } + HOEDOWN_BUFPUTSL(ob,"<li>\n"); + } else { + HOEDOWN_BUFPUTSL(ob,"</li>\n<li>\n"); + } + + hoedown_buffer_printf(ob, "<a href=\"#toc_%d\">", state->toc_data.header_count++); + if (content) hoedown_buffer_put(ob, content->data, content->size); + HOEDOWN_BUFPUTSL(ob, "</a>\n"); + } +} + +static int +toc_link(hoedown_buffer *ob, const hoedown_buffer *content, const hoedown_buffer *link, const hoedown_buffer *title, const hoedown_renderer_data *data) +{ + if (content && content->size) hoedown_buffer_put(ob, content->data, content->size); + return 1; +} + +static void +toc_finalize(hoedown_buffer *ob, int inline_render, const hoedown_renderer_data *data) +{ + hoedown_html_renderer_state *state; + + if (inline_render) + return; + + state = data->opaque; + + while (state->toc_data.current_level > 0) { + HOEDOWN_BUFPUTSL(ob, "</li>\n</ul>\n"); + state->toc_data.current_level--; + } + + state->toc_data.header_count = 0; +} + +hoedown_renderer * +hoedown_html_toc_renderer_new(int nesting_level) +{ + static const hoedown_renderer cb_default = { + NULL, + + NULL, + NULL, + toc_header, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + + NULL, + rndr_codespan, + rndr_double_emphasis, + rndr_emphasis, + rndr_underline, + rndr_highlight, + rndr_quote, + NULL, + NULL, + toc_link, + rndr_triple_emphasis, + rndr_strikethrough, + rndr_superscript, + NULL, + NULL, + NULL, + + NULL, + rndr_normal_text, + + NULL, + toc_finalize + }; + + hoedown_html_renderer_state *state; + hoedown_renderer *renderer; + + /* Prepare the state pointer */ + state = hoedown_malloc(sizeof(hoedown_html_renderer_state)); + memset(state, 0x0, sizeof(hoedown_html_renderer_state)); + + state->toc_data.nesting_level = nesting_level; + + /* Prepare the renderer */ + renderer = hoedown_malloc(sizeof(hoedown_renderer)); + memcpy(renderer, &cb_default, sizeof(hoedown_renderer)); + + renderer->opaque = state; + return renderer; +} + +hoedown_renderer * +hoedown_html_renderer_new(hoedown_html_flags render_flags, int nesting_level) +{ + static const hoedown_renderer cb_default = { + NULL, + + rndr_blockcode, + rndr_blockquote, + rndr_header, + rndr_hrule, + rndr_list, + rndr_listitem, + rndr_paragraph, + rndr_table, + rndr_table_header, + rndr_table_body, + rndr_tablerow, + rndr_tablecell, + rndr_footnotes, + rndr_footnote_def, + rndr_raw_block, + + rndr_autolink, + rndr_codespan, + rndr_double_emphasis, + rndr_emphasis, + rndr_underline, + rndr_highlight, + rndr_quote, + rndr_image, + rndr_linebreak, + rndr_link, + rndr_triple_emphasis, + rndr_strikethrough, + rndr_superscript, + rndr_footnote_ref, + rndr_math, + rndr_raw_html, + + NULL, + rndr_normal_text, + + NULL, + NULL + }; + + hoedown_html_renderer_state *state; + hoedown_renderer *renderer; + + /* Prepare the state pointer */ + state = hoedown_malloc(sizeof(hoedown_html_renderer_state)); + memset(state, 0x0, sizeof(hoedown_html_renderer_state)); + + state->flags = render_flags; + state->toc_data.nesting_level = nesting_level; + + /* Prepare the renderer */ + renderer = hoedown_malloc(sizeof(hoedown_renderer)); + memcpy(renderer, &cb_default, sizeof(hoedown_renderer)); + + if (render_flags & HOEDOWN_HTML_SKIP_HTML || render_flags & HOEDOWN_HTML_ESCAPE) + renderer->blockhtml = NULL; + + renderer->opaque = state; + return renderer; +} + +void +hoedown_html_renderer_free(hoedown_renderer *renderer) +{ + free(renderer->opaque); + free(renderer); +} |