#include #include #include #include #include "config.h" #include "cmark.h" #include "node.h" #include "buffer.h" #include "debug.h" #include "html/houdini.h" typedef struct RenderStack { struct RenderStack *previous; char* literal; cmark_node* next_sibling; bool tight; bool trim; } render_stack; static void free_render_stack(render_stack * rstack) { render_stack * tempstack; while (rstack) { tempstack = rstack; rstack = rstack->previous; free(tempstack); } } static render_stack* push_inline(render_stack* rstack, cmark_node* inl, char* literal) { render_stack* newstack; newstack = (render_stack*)malloc(sizeof(render_stack)); if (newstack == NULL) { return NULL; } newstack->previous = rstack; newstack->next_sibling = inl; newstack->literal = literal; newstack->tight = false; newstack->trim = false; return newstack; } static render_stack* push_block(render_stack* rstack, cmark_node* block, char* literal, bool tight, bool trim) { render_stack* newstack; newstack = (render_stack*)malloc(sizeof(render_stack)); if (newstack == NULL) { return NULL; } newstack->previous = rstack; newstack->next_sibling = block; newstack->literal = literal; newstack->tight = tight; newstack->trim = trim; return newstack; } static render_stack* pop_render_stack(render_stack* rstack) { render_stack* top = rstack; if (rstack == NULL) { return NULL; } rstack = rstack->previous; top->previous = NULL; free_render_stack(top); return rstack; } // Functions to convert cmark_node and inline lists to HTML strings. static void escape_html(strbuf *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(strbuf *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(strbuf *html) { if (html->size && html->ptr[html->size - 1] != '\n') strbuf_putc(html, '\n'); } // Convert an inline list to HTML. Returns 0 on success, and sets result. static void inlines_to_plain_html(strbuf *html, cmark_node* ils) { cmark_node* children; bool visit_children; render_stack* rstack = NULL; while(ils != NULL) { visit_children = false; switch(ils->type) { case NODE_STRING: case NODE_INLINE_CODE: case NODE_INLINE_HTML: escape_html(html, ils->as.literal.data, ils->as.literal.len); break; case NODE_LINEBREAK: case NODE_SOFTBREAK: strbuf_putc(html, '\n'); break; case NODE_LINK: case NODE_IMAGE: case NODE_STRONG: case NODE_EMPH: children = ils->first_child; visit_children = true; rstack = push_inline(rstack, ils->next, ""); break; default: break; } if (visit_children) { ils = children; } else { ils = ils->next; } while (ils == NULL && rstack != NULL) { strbuf_puts(html, rstack->literal); ils = rstack->next_sibling; rstack = pop_render_stack(rstack); } } free_render_stack(rstack); } // Convert an inline list to HTML. Returns 0 on success, and sets result. static void inlines_to_html(strbuf *html, cmark_node* ils) { cmark_node* children; render_stack* rstack = NULL; while(ils != NULL) { children = NULL; switch(ils->type) { case NODE_STRING: escape_html(html, ils->as.literal.data, ils->as.literal.len); break; case NODE_LINEBREAK: strbuf_puts(html, "
\n"); break; case NODE_SOFTBREAK: strbuf_putc(html, '\n'); break; case NODE_INLINE_CODE: strbuf_puts(html, ""); escape_html(html, ils->as.literal.data, ils->as.literal.len); strbuf_puts(html, ""); break; case NODE_INLINE_HTML: strbuf_put(html, ils->as.literal.data, ils->as.literal.len); break; case NODE_LINK: strbuf_puts(html, "as.link.url) escape_href(html, ils->as.link.url, -1); if (ils->as.link.title) { strbuf_puts(html, "\" title=\""); escape_html(html, ils->as.link.title, -1); } strbuf_puts(html, "\">"); children = ils->first_child; rstack = push_inline(rstack, ils->next, ""); break; case NODE_IMAGE: strbuf_puts(html, "as.link.url) escape_href(html, ils->as.link.url, -1); strbuf_puts(html, "\" alt=\""); inlines_to_plain_html(html, ils->first_child); if (ils->as.link.title) { strbuf_puts(html, "\" title=\""); escape_html(html, ils->as.link.title, -1); } strbuf_puts(html, "\"/>"); break; case NODE_STRONG: strbuf_puts(html, ""); children = ils->first_child; rstack = push_inline(rstack, ils->next, ""); break; case NODE_EMPH: strbuf_puts(html, ""); children = ils->first_child; rstack = push_inline(rstack, ils->next, ""); break; default: break; } if (children) { ils = children; } else { ils = ils->next; } while (ils == NULL && rstack != NULL) { strbuf_puts(html, rstack->literal); ils = rstack->next_sibling; rstack = pop_render_stack(rstack); } } free_render_stack(rstack); } // Convert a cmark_node list to HTML. Returns 0 on success, and sets result. static void blocks_to_html(strbuf *html, cmark_node *b) { cmark_list *data; render_stack* rstack = NULL; bool visit_children = false; bool tight = false; while(b != NULL) { visit_children = false; switch(b->type) { case NODE_DOCUMENT: rstack = push_block(rstack, b->next, "", false, false); visit_children = true; break; case NODE_PARAGRAPH: if (tight) { inlines_to_html(html, b->first_child); } else { cr(html); strbuf_puts(html, "

"); inlines_to_html(html, b->first_child); strbuf_puts(html, "

\n"); } break; case NODE_BQUOTE: cr(html); strbuf_puts(html, "
\n"); rstack = push_block(rstack, b->next, "
\n", tight, false); tight = false; visit_children = true; break; case NODE_LIST_ITEM: cr(html); strbuf_puts(html, "
  • "); rstack = push_block(rstack, b->next, "
  • \n", tight, true); visit_children = true; break; case NODE_LIST: // make sure a list starts at the beginning of the line: cr(html); data = &(b->as.list); if (data->start > 1) { strbuf_printf(html, "<%s start=\"%d\">\n", data->list_type == CMARK_BULLET_LIST ? "ul" : "ol", data->start); } else { strbuf_puts(html, data->list_type == CMARK_BULLET_LIST ? "
      \n" : "
        \n"); } rstack = push_block(rstack, b->next, data->list_type == CMARK_BULLET_LIST ? "\n
    \n" : "\n\n", tight, false); tight = data->tight; visit_children = true; break; case NODE_ATX_HEADER: case NODE_SETEXT_HEADER: cr(html); strbuf_printf(html, "", b->as.header.level); inlines_to_html(html, b->first_child); strbuf_printf(html, "\n", b->as.header.level); break; case NODE_INDENTED_CODE: case NODE_FENCED_CODE: cr(html); strbuf_puts(html, "
    type == NODE_FENCED_CODE) {
    				strbuf *info = &b->as.code.info;
    
    				if (strbuf_len(info) > 0) {
    					int first_tag = strbuf_strchr(info, ' ', 0);
    					if (first_tag < 0)
    						first_tag = strbuf_len(info);
    
    					strbuf_puts(html, " class=\"language-");
    					escape_html(html, info->ptr, first_tag);
    					strbuf_putc(html, '"');
    				}
    			}
    
    			strbuf_putc(html, '>');
    			escape_html(html, b->string_content.ptr, b->string_content.size);
    			strbuf_puts(html, "
    \n"); break; case NODE_HTML: strbuf_put(html, b->string_content.ptr, b->string_content.size); break; case NODE_HRULE: strbuf_puts(html, "
    \n"); break; case NODE_REFERENCE_DEF: break; default: assert(false); } if (visit_children) { b = b->first_child; } else { b = b->next; } while (b == NULL && rstack != NULL) { strbuf_puts(html, rstack->literal); if (rstack->trim) { strbuf_rtrim(html); } tight = rstack->tight; b = rstack->next_sibling; rstack = pop_render_stack(rstack); } } free_render_stack(rstack); } unsigned char *cmark_render_html(cmark_node *root) { unsigned char *result; strbuf html = GH_BUF_INIT; blocks_to_html(&html, root); result = strbuf_detach(&html); strbuf_free(&html); return result; }