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#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cmark.h"
#include "node.h"
#include "buffer.h"
#define BUFFER_SIZE 100
#define MAX_INDENT 40
// Functions to convert cmark_nodes to XML strings.
// C0 control characters, U+FFFE and U+FFF aren't allowed in XML.
static const char XML_ESCAPE_TABLE[256] = {
/* 0x00 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1,
/* 0x10 */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 0x20 */ 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x30 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 5, 0,
/* 0x40 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x50 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x60 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x70 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x80 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0x90 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xA0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xB0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 9,
/* 0xC0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xD0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xE0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xF0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// U+FFFD Replacement Character encoded in UTF-8
#define UTF8_REPL "\xEF\xBF\xBD"
static const char *XML_ESCAPES[] = {
"", UTF8_REPL, """, "&", "<", ">"
};
static void escape_xml(cmark_strbuf *ob, const unsigned char *src,
bufsize_t size) {
bufsize_t i = 0, org, esc = 0;
while (i < size) {
org = i;
while (i < size && (esc = XML_ESCAPE_TABLE[src[i]]) == 0)
i++;
if (i > org)
cmark_strbuf_put(ob, src + org, i - org);
if (i >= size)
break;
if (esc == 9) {
// To replace U+FFFE and U+FFFF with U+FFFD, only the last byte has to
// be changed.
// We know that src[i] is 0xBE or 0xBF.
if (i >= 2 && src[i-2] == 0xEF && src[i-1] == 0xBF) {
cmark_strbuf_putc(ob, 0xBD);
} else {
cmark_strbuf_putc(ob, src[i]);
}
} else {
cmark_strbuf_puts(ob, XML_ESCAPES[esc]);
}
i++;
}
}
static void escape_xml_str(cmark_strbuf *dest, const unsigned char *source) {
if (source)
escape_xml(dest, source, (bufsize_t)strlen((char *)source));
}
struct render_state {
cmark_strbuf *xml;
int indent;
};
static inline void indent(struct render_state *state) {
int i;
for (i = 0; i < state->indent && i < MAX_INDENT; i++) {
cmark_strbuf_putc(state->xml, ' ');
}
}
static int S_render_node(cmark_node *node, cmark_event_type ev_type,
struct render_state *state, int options) {
cmark_strbuf *xml = state->xml;
bool literal = false;
cmark_delim_type delim;
bool entering = (ev_type == CMARK_EVENT_ENTER);
char buffer[BUFFER_SIZE];
if (entering) {
indent(state);
cmark_strbuf_putc(xml, '<');
cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
if (options & CMARK_OPT_SOURCEPOS && node->start_line != 0) {
snprintf(buffer, BUFFER_SIZE, " sourcepos=\"%d:%d-%d:%d\"",
node->start_line, node->start_column, node->end_line,
node->end_column);
cmark_strbuf_puts(xml, buffer);
}
literal = false;
switch (node->type) {
case CMARK_NODE_DOCUMENT:
cmark_strbuf_puts(xml, " xmlns=\"http://commonmark.org/xml/1.0\"");
break;
case CMARK_NODE_TEXT:
case CMARK_NODE_CODE:
case CMARK_NODE_HTML_BLOCK:
case CMARK_NODE_HTML_INLINE:
cmark_strbuf_puts(xml, " xml:space=\"preserve\">");
escape_xml(xml, node->data, node->len);
cmark_strbuf_puts(xml, "</");
cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
literal = true;
break;
case CMARK_NODE_LIST:
switch (cmark_node_get_list_type(node)) {
case CMARK_ORDERED_LIST:
cmark_strbuf_puts(xml, " type=\"ordered\"");
snprintf(buffer, BUFFER_SIZE, " start=\"%d\"",
cmark_node_get_list_start(node));
cmark_strbuf_puts(xml, buffer);
delim = cmark_node_get_list_delim(node);
if (delim == CMARK_PAREN_DELIM) {
cmark_strbuf_puts(xml, " delimiter=\"paren\"");
} else if (delim == CMARK_PERIOD_DELIM) {
cmark_strbuf_puts(xml, " delimiter=\"period\"");
}
break;
case CMARK_BULLET_LIST:
cmark_strbuf_puts(xml, " type=\"bullet\"");
break;
default:
break;
}
snprintf(buffer, BUFFER_SIZE, " tight=\"%s\"",
(cmark_node_get_list_tight(node) ? "true" : "false"));
cmark_strbuf_puts(xml, buffer);
break;
case CMARK_NODE_HEADING:
snprintf(buffer, BUFFER_SIZE, " level=\"%d\"", node->as.heading.level);
cmark_strbuf_puts(xml, buffer);
break;
case CMARK_NODE_CODE_BLOCK:
if (node->as.code.info) {
cmark_strbuf_puts(xml, " info=\"");
escape_xml_str(xml, node->as.code.info);
cmark_strbuf_putc(xml, '"');
}
cmark_strbuf_puts(xml, " xml:space=\"preserve\">");
escape_xml(xml, node->data, node->len);
cmark_strbuf_puts(xml, "</");
cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
literal = true;
break;
case CMARK_NODE_CUSTOM_BLOCK:
case CMARK_NODE_CUSTOM_INLINE:
cmark_strbuf_puts(xml, " on_enter=\"");
escape_xml_str(xml, node->as.custom.on_enter);
cmark_strbuf_putc(xml, '"');
cmark_strbuf_puts(xml, " on_exit=\"");
escape_xml_str(xml, node->as.custom.on_exit);
cmark_strbuf_putc(xml, '"');
break;
case CMARK_NODE_LINK:
case CMARK_NODE_IMAGE:
cmark_strbuf_puts(xml, " destination=\"");
escape_xml_str(xml, node->as.link.url);
cmark_strbuf_putc(xml, '"');
if (node->as.link.title) {
cmark_strbuf_puts(xml, " title=\"");
escape_xml_str(xml, node->as.link.title);
cmark_strbuf_putc(xml, '"');
}
break;
default:
break;
}
if (node->first_child) {
state->indent += 2;
} else if (!literal) {
cmark_strbuf_puts(xml, " /");
}
cmark_strbuf_puts(xml, ">\n");
} else if (node->first_child) {
state->indent -= 2;
indent(state);
cmark_strbuf_puts(xml, "</");
cmark_strbuf_puts(xml, cmark_node_get_type_string(node));
cmark_strbuf_puts(xml, ">\n");
}
return 1;
}
char *cmark_render_xml(cmark_node *root, int options) {
char *result;
cmark_strbuf xml = CMARK_BUF_INIT(root->mem);
cmark_event_type ev_type;
cmark_node *cur;
struct render_state state = {&xml, 0};
cmark_iter *iter = cmark_iter_new(root);
cmark_strbuf_puts(state.xml, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
cmark_strbuf_puts(state.xml,
"<!DOCTYPE document SYSTEM \"CommonMark.dtd\">\n");
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
cur = cmark_iter_get_node(iter);
S_render_node(cur, ev_type, &state, options);
}
result = (char *)cmark_strbuf_detach(&xml);
cmark_iter_free(iter);
return result;
}
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