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#include <stdlib.h>
#include "buffer.h"
#include "chunk.h"
#include "cmark.h"
#include "utf8.h"
#include "render.h"
void cr(cmark_render_state *state)
{
if (state->need_cr < 1) {
state->need_cr = 1;
}
}
void blankline(cmark_render_state *state)
{
if (state->need_cr < 2) {
state->need_cr = 2;
}
}
void out(cmark_render_state *state,
cmark_chunk str,
bool wrap,
cmark_escaping escape)
{
unsigned char* source = str.data;
int length = str.len;
unsigned char nextc;
int32_t c;
int i = 0;
int len;
cmark_chunk remainder = cmark_chunk_literal("");
int k = state->buffer->size - 1;
wrap = wrap && !state->no_wrap;
if (state->in_tight_list_item && state->need_cr > 1) {
state->need_cr = 1;
}
while (state->need_cr) {
if (k < 0 || state->buffer->ptr[k] == '\n') {
k -= 1;
} else {
cmark_strbuf_putc(state->buffer, '\n');
if (state->need_cr > 1) {
cmark_strbuf_put(state->buffer, state->prefix->ptr,
state->prefix->size);
}
}
state->column = 0;
state->begin_line = true;
state->need_cr -= 1;
}
while (i < length) {
if (state->begin_line) {
cmark_strbuf_put(state->buffer, state->prefix->ptr,
state->prefix->size);
// note: this assumes prefix is ascii:
state->column = state->prefix->size;
}
len = utf8proc_iterate(source + i, length - i, &c);
if (len == -1) { // error condition
return; // return without rendering rest of string
}
nextc = source[i + len];
if (c == 32 && wrap) {
if (!state->begin_line) {
cmark_strbuf_putc(state->buffer, ' ');
state->column += 1;
state->begin_line = false;
state->last_breakable = state->buffer->size -
1;
// skip following spaces
while (source[i + 1] == ' ') {
i++;
}
}
} else if (c == 10) {
cmark_strbuf_putc(state->buffer, '\n');
state->column = 0;
state->begin_line = true;
state->last_breakable = 0;
} else {
(state->outc)(state, escape, c, nextc);
}
// If adding the character went beyond width, look for an
// earlier place where the line could be broken:
if (state->width > 0 &&
state->column > state->width &&
!state->begin_line &&
state->last_breakable > 0) {
// copy from last_breakable to remainder
cmark_chunk_set_cstr(&remainder, (char *) state->buffer->ptr + state->last_breakable + 1);
// truncate at last_breakable
cmark_strbuf_truncate(state->buffer, state->last_breakable);
// add newline, prefix, and remainder
cmark_strbuf_putc(state->buffer, '\n');
cmark_strbuf_put(state->buffer, state->prefix->ptr,
state->prefix->size);
cmark_strbuf_put(state->buffer, remainder.data, remainder.len);
state->column = state->prefix->size + remainder.len;
cmark_chunk_free(&remainder);
state->last_breakable = 0;
state->begin_line = false;
}
i += len;
}
}
void lit(cmark_render_state *state, char *s, bool wrap)
{
cmark_chunk str = cmark_chunk_literal(s);
out(state, str, wrap, LITERAL);
}
char*
cmark_render(cmark_node *root,
int options,
int width,
void (*outc)(cmark_render_state*,
cmark_escaping,
int32_t,
unsigned char),
int (*render_node)(cmark_node *node,
cmark_event_type ev_type,
cmark_render_state *state))
{
cmark_strbuf pref = GH_BUF_INIT;
cmark_strbuf buf = GH_BUF_INIT;
cmark_node *cur;
cmark_event_type ev_type;
char *result;
cmark_iter *iter = cmark_iter_new(root);
if (CMARK_OPT_HARDBREAKS & options) {
width = 0;
}
cmark_render_state state = { options, &buf, &pref, 0, width,
0, 0, 0, true, false, false, outc };
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
cur = cmark_iter_get_node(iter);
if (!render_node(cur, ev_type, &state)) {
// a false value causes us to skip processing
// the node's contents. this is used for
// autolinks.
cmark_iter_reset(iter, cur, CMARK_EVENT_EXIT);
}
}
result = (char *)cmark_strbuf_detach(state.buffer);
cmark_iter_free(iter);
cmark_strbuf_free(state.prefix);
cmark_strbuf_free(state.buffer);
return result;
}
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