summaryrefslogtreecommitdiff
path: root/src/render.c
blob: 442a7fcc5cfca0cd5521d444be453d1fbd299f3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
#include <stdlib.h>
#include "buffer.h"
#include "chunk.h"
#include "cmark.h"
#include "utf8.h"
#include "render.h"

void cr(cmark_renderer *renderer)
{
	if (renderer->need_cr < 1) {
		renderer->need_cr = 1;
	}
}

void blankline(cmark_renderer *renderer)
{
	if (renderer->need_cr < 2) {
		renderer->need_cr = 2;
	}
}

void out(cmark_renderer *renderer,
	 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 = renderer->buffer->size - 1;

	wrap = wrap && !renderer->no_wrap;

	if (renderer->in_tight_list_item && renderer->need_cr > 1) {
		renderer->need_cr = 1;
	}
	while (renderer->need_cr) {
		if (k < 0 || renderer->buffer->ptr[k] == '\n') {
			k -= 1;
		} else {
			cmark_strbuf_putc(renderer->buffer, '\n');
			if (renderer->need_cr > 1) {
				cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
				                 renderer->prefix->size);
			}
		}
		renderer->column = 0;
		renderer->begin_line = true;
		renderer->need_cr -= 1;
	}

	while (i < length) {
		if (renderer->begin_line) {
			cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
			                 renderer->prefix->size);
			// note: this assumes prefix is ascii:
			renderer->column = renderer->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 (!renderer->begin_line) {
				cmark_strbuf_putc(renderer->buffer, ' ');
				renderer->column += 1;
				renderer->begin_line = false;
				renderer->last_breakable = renderer->buffer->size -
				                        1;
				// skip following spaces
				while (source[i + 1] == ' ') {
					i++;
				}
			}

		} else if (c == 10) {
			cmark_strbuf_putc(renderer->buffer, '\n');
			renderer->column = 0;
			renderer->begin_line = true;
			renderer->last_breakable = 0;
		} else {
			(renderer->outc)(renderer, escape, c, nextc);
		}

		// If adding the character went beyond width, look for an
		// earlier place where the line could be broken:
		if (renderer->width > 0 &&
		    renderer->column > renderer->width &&
		    !renderer->begin_line &&
		    renderer->last_breakable > 0) {

			// copy from last_breakable to remainder
			cmark_chunk_set_cstr(&remainder, (char *) renderer->buffer->ptr + renderer->last_breakable + 1);
			// truncate at last_breakable
			cmark_strbuf_truncate(renderer->buffer, renderer->last_breakable);
			// add newline, prefix, and remainder
			cmark_strbuf_putc(renderer->buffer, '\n');
			cmark_strbuf_put(renderer->buffer, renderer->prefix->ptr,
			                 renderer->prefix->size);
			cmark_strbuf_put(renderer->buffer, remainder.data, remainder.len);
			renderer->column = renderer->prefix->size + remainder.len;
			cmark_chunk_free(&remainder);
			renderer->last_breakable = 0;
			renderer->begin_line = false;
		}

		i += len;
	}
}

void lit(cmark_renderer *renderer, char *s, bool wrap)
{
	cmark_chunk str = cmark_chunk_literal(s);
	out(renderer, str, wrap, LITERAL);
}

char*
cmark_render(cmark_node *root,
	     int options,
	     int width,
	     void (*outc)(cmark_renderer*,
			  cmark_escaping,
			  int32_t,
			  unsigned char),
	     int (*render_node)(cmark_node *node,
				 cmark_event_type ev_type,
				 cmark_renderer *renderer))
{
	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_renderer renderer = { 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, &renderer)) {
			// 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(renderer.buffer);

	cmark_iter_free(iter);
	cmark_strbuf_free(renderer.prefix);
	cmark_strbuf_free(renderer.buffer);

	return result;
}