path: root/src/print.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "cmark.h"
#include "buffer.h"
#include "node.h"

#define INDENT 2

static void print_str(cmark_strbuf* buffer, const unsigned char *s, int len)
{
    int i;

    if (len < 0)
        len = strlen((char *)s);

    cmark_strbuf_putc(buffer, '"');
    for (i = 0; i < len; ++i) {
        unsigned char c = s[i];

        switch (c) {
        case '\n':
            cmark_strbuf_printf(buffer, "\\n");
            break;
        case '"':
            cmark_strbuf_printf(buffer, "\\\"");
            break;
        case '\\':
            cmark_strbuf_printf(buffer, "\\\\");
            break;
        default:
            cmark_strbuf_putc(buffer, (int)c);
        }
    }
    cmark_strbuf_putc(buffer, '"');
}

// Prettyprint an inline list, for debugging.
static void render_nodes(cmark_strbuf* buffer, cmark_node* node, int indent)
{
    int i;
    cmark_list *data;

    while(node != NULL) {
        for (i=0; i < indent; i++) {
            cmark_strbuf_putc(buffer, ' ');
        }
        switch(node->type) {
        case NODE_DOCUMENT:
            break;
        case NODE_BLOCK_QUOTE:
            cmark_strbuf_printf(buffer, "block_quote\n");
            break;
        case NODE_LIST_ITEM:
            cmark_strbuf_printf(buffer, "list_item\n");
            break;
        case NODE_LIST:
            data = &(node->as.list);
            if (data->list_type == CMARK_ORDERED_LIST) {
                cmark_strbuf_printf(buffer, "list (type=ordered tight=%s start=%d delim=%s)\n",
                       (data->tight ? "true" : "false"),
                       data->start,
                       (data->delimiter == CMARK_PAREN_DELIM ? "parens" : "period"));
            } else {
                cmark_strbuf_printf(buffer, "list (type=bullet tight=%s bullet_char=%c)\n",
                       (data->tight ? "true" : "false"),
                       data->bullet_char);
            }
            break;
        case NODE_HEADER:
            cmark_strbuf_printf(buffer, "header (level=%d)\n", node->as.header.level);
            break;
        case NODE_PARAGRAPH:
            cmark_strbuf_printf(buffer, "paragraph\n");
            break;
        case NODE_HRULE:
            cmark_strbuf_printf(buffer, "hrule\n");
            break;
        case NODE_CODE_BLOCK:
            cmark_strbuf_printf(buffer, "code_block fenced=%d fence_length=%d info=", node->as.code.fenced, node->as.code.fence_length);
            print_str(buffer, node->as.code.info.data,
                  node->as.code.info.len);
            cmark_strbuf_putc(buffer, ' ');
            print_str(buffer, node->as.code.literal.data,
                  node->as.code.literal.len);
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_HTML:
            cmark_strbuf_printf(buffer, "html ");
            print_str(buffer, node->as.literal.data,
                  node->as.literal.len);
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_TEXT:
            cmark_strbuf_printf(buffer, "text ");
            print_str(buffer, node->as.literal.data, node->as.literal.len);
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_LINEBREAK:
            cmark_strbuf_printf(buffer, "linebreak\n");
            break;
        case NODE_SOFTBREAK:
            cmark_strbuf_printf(buffer, "softbreak\n");
            break;
        case NODE_CODE:
            cmark_strbuf_printf(buffer, "code ");
            print_str(buffer, node->as.literal.data, node->as.literal.len);
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_INLINE_HTML:
            cmark_strbuf_printf(buffer, "inline_html ");
            print_str(buffer, node->as.literal.data, node->as.literal.len);
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_LINK:
        case NODE_IMAGE:
            cmark_strbuf_printf(buffer, "%s url=", node->type == NODE_LINK ? "link" : "image");

            if (node->as.link.url)
                print_str(buffer, node->as.link.url, -1);

            if (node->as.link.title) {
                cmark_strbuf_printf(buffer, " title=");
                print_str(buffer, node->as.link.title, -1);
            }
            cmark_strbuf_putc(buffer, '\n');
            break;
        case NODE_STRONG:
            cmark_strbuf_printf(buffer, "strong\n");
            break;
        case NODE_EMPH:
            cmark_strbuf_printf(buffer, "emph\n");
            break;
        default:
            break;
        }
        if (node->first_child) { // render children if any
            indent += INDENT;
            node = node->first_child;
        } else if (node->next) { // otherwise render next sibling
            node = node->next;
        } else {
            node = node->parent;  // back up to parent
            while (node) {
                indent -= INDENT;
                if (node->next) {
                    node = node->next;
                    break;
                } else {
                    node = node->parent;
                }
                if (!node) {
                    break;
                }
            }
        }
    }
}

char *cmark_render_ast(cmark_node *root)
{
    char* result;
    cmark_strbuf buffer = GH_BUF_INIT;
    render_nodes(&buffer, root, -2);
    result = (char *)cmark_strbuf_detach(&buffer);
    cmark_strbuf_free(&buffer);
    return result;
}