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
168
169
|
#include <stdbool.h>
#include "strikethrough.h"
#include <parser.h>
#include <render.h>
cmark_node_type CMARK_NODE_STRIKETHROUGH;
static cmark_node *match(cmark_syntax_extension *self, cmark_parser *parser,
cmark_node *parent, unsigned char character,
cmark_inline_parser *inline_parser) {
cmark_node *res = NULL;
int left_flanking, right_flanking, punct_before, punct_after, delims;
char buffer[101];
if (character != '~')
return NULL;
delims = cmark_inline_parser_scan_delimiters(
inline_parser, sizeof(buffer) - 1, '~',
&left_flanking,
&right_flanking, &punct_before, &punct_after);
memset(buffer, '~', delims);
buffer[delims] = 0;
res = cmark_node_new_with_mem(CMARK_NODE_TEXT, parser->mem);
cmark_node_set_literal(res, buffer);
res->start_line = res->end_line = cmark_inline_parser_get_line(inline_parser);
res->start_column = cmark_inline_parser_get_column(inline_parser) - delims;
if ((left_flanking || right_flanking) &&
(delims == 2 || (!(parser->options & CMARK_OPT_STRIKETHROUGH_DOUBLE_TILDE) && delims == 1))) {
cmark_inline_parser_push_delimiter(inline_parser, character, left_flanking,
right_flanking, res);
}
return res;
}
static delimiter *insert(cmark_syntax_extension *self, cmark_parser *parser,
cmark_inline_parser *inline_parser, delimiter *opener,
delimiter *closer) {
cmark_node *strikethrough;
cmark_node *tmp, *next;
delimiter *delim, *tmp_delim;
delimiter *res = closer->next;
strikethrough = opener->inl_text;
if (opener->inl_text->as.literal.len != closer->inl_text->as.literal.len)
goto done;
if (!cmark_node_set_type(strikethrough, CMARK_NODE_STRIKETHROUGH))
goto done;
cmark_node_set_syntax_extension(strikethrough, self);
tmp = cmark_node_next(opener->inl_text);
while (tmp) {
if (tmp == closer->inl_text)
break;
next = cmark_node_next(tmp);
cmark_node_append_child(strikethrough, tmp);
tmp = next;
}
strikethrough->end_column = closer->inl_text->start_column + closer->inl_text->as.literal.len - 1;
cmark_node_free(closer->inl_text);
done:
delim = closer;
while (delim != NULL && delim != opener) {
tmp_delim = delim->previous;
cmark_inline_parser_remove_delimiter(inline_parser, delim);
delim = tmp_delim;
}
cmark_inline_parser_remove_delimiter(inline_parser, opener);
return res;
}
static const char *get_type_string(cmark_syntax_extension *extension,
cmark_node *node) {
return node->type == CMARK_NODE_STRIKETHROUGH ? "strikethrough" : "<unknown>";
}
static int can_contain(cmark_syntax_extension *extension, cmark_node *node,
cmark_node_type child_type) {
if (node->type != CMARK_NODE_STRIKETHROUGH)
return false;
return CMARK_NODE_TYPE_INLINE_P(child_type);
}
static void commonmark_render(cmark_syntax_extension *extension,
cmark_renderer *renderer, cmark_node *node,
cmark_event_type ev_type, int options) {
renderer->out(renderer, node, "~~", false, LITERAL);
}
static void latex_render(cmark_syntax_extension *extension,
cmark_renderer *renderer, cmark_node *node,
cmark_event_type ev_type, int options) {
// requires \usepackage{ulem}
bool entering = (ev_type == CMARK_EVENT_ENTER);
if (entering) {
renderer->out(renderer, node, "\\sout{", false, LITERAL);
} else {
renderer->out(renderer, node, "}", false, LITERAL);
}
}
static void man_render(cmark_syntax_extension *extension,
cmark_renderer *renderer, cmark_node *node,
cmark_event_type ev_type, int options) {
bool entering = (ev_type == CMARK_EVENT_ENTER);
if (entering) {
renderer->cr(renderer);
renderer->out(renderer, node, ".ST \"", false, LITERAL);
} else {
renderer->out(renderer, node, "\"", false, LITERAL);
renderer->cr(renderer);
}
}
static void html_render(cmark_syntax_extension *extension,
cmark_html_renderer *renderer, cmark_node *node,
cmark_event_type ev_type, int options) {
bool entering = (ev_type == CMARK_EVENT_ENTER);
if (entering) {
cmark_strbuf_puts(renderer->html, "<del>");
} else {
cmark_strbuf_puts(renderer->html, "</del>");
}
}
static void plaintext_render(cmark_syntax_extension *extension,
cmark_renderer *renderer, cmark_node *node,
cmark_event_type ev_type, int options) {
renderer->out(renderer, node, "~", false, LITERAL);
}
cmark_syntax_extension *create_strikethrough_extension(void) {
cmark_syntax_extension *ext = cmark_syntax_extension_new("strikethrough");
cmark_llist *special_chars = NULL;
cmark_syntax_extension_set_get_type_string_func(ext, get_type_string);
cmark_syntax_extension_set_can_contain_func(ext, can_contain);
cmark_syntax_extension_set_commonmark_render_func(ext, commonmark_render);
cmark_syntax_extension_set_latex_render_func(ext, latex_render);
cmark_syntax_extension_set_man_render_func(ext, man_render);
cmark_syntax_extension_set_html_render_func(ext, html_render);
cmark_syntax_extension_set_plaintext_render_func(ext, plaintext_render);
CMARK_NODE_STRIKETHROUGH = cmark_syntax_extension_add_node(1);
cmark_syntax_extension_set_match_inline_func(ext, match);
cmark_syntax_extension_set_inline_from_delim_func(ext, insert);
cmark_mem *mem = cmark_get_default_mem_allocator();
special_chars = cmark_llist_append(mem, special_chars, (void *)'~');
cmark_syntax_extension_set_special_inline_chars(ext, special_chars);
cmark_syntax_extension_set_emphasis(ext, 1);
return ext;
}
|
