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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
use crate::sanitize::sanitize_text;
use crate::utils::format_url;
use crate::{Error, MermaidConfig, Result};
use indexmap::IndexMap;
use std::collections::HashMap;
use super::{
ClickAction, Edge, EdgeDefaults, FlowSubGraph, LinkStylePos, Node, Stmt, TitleKind,
apply_shape_data_to_node, parse_shape_data_yaml, yaml_to_bool, yaml_to_string,
};
#[allow(clippy::too_many_arguments)]
pub(super) fn apply_semantic_statements(
statements: &[Stmt],
nodes: &mut Vec<Node>,
node_index: &mut HashMap<String, usize>,
edges: &mut Vec<Edge>,
subgraphs: &mut Vec<FlowSubGraph>,
subgraph_index: &mut HashMap<String, usize>,
class_defs: &mut IndexMap<String, Vec<String>>,
tooltips: &mut HashMap<String, String>,
edge_defaults: &mut EdgeDefaults,
security_level_loose: bool,
diagram_type: &str,
config: &MermaidConfig,
) -> Result<()> {
for stmt in statements {
match stmt {
Stmt::Subgraph(sg) => {
apply_semantic_statements(
&sg.statements,
nodes,
node_index,
edges,
subgraphs,
subgraph_index,
class_defs,
tooltips,
edge_defaults,
security_level_loose,
diagram_type,
config,
)?;
}
Stmt::Style(s) => {
if let Some(&idx) = subgraph_index.get(&s.target) {
subgraphs[idx].styles.extend(s.styles.iter().cloned());
} else {
let idx = ensure_node(nodes, node_index, &s.target);
nodes[idx].styles.extend(s.styles.iter().cloned());
}
}
Stmt::ClassDef(c) => {
for id in &c.ids {
class_defs.insert(id.clone(), c.styles.clone());
}
}
Stmt::ClassAssign(c) => {
for target in &c.targets {
add_class_to_target(
nodes,
node_index,
edges,
subgraphs,
subgraph_index,
target,
&c.class_name,
);
}
}
Stmt::Click(c) => {
for id in &c.ids {
if let Some(tt) = &c.tooltip {
tooltips.insert(id.clone(), sanitize_text(tt, config));
}
add_class_to_target(
nodes,
node_index,
edges,
subgraphs,
subgraph_index,
id,
"clickable",
);
match &c.action {
ClickAction::Link { href, target } => {
if let Some(&idx) = node_index.get(id) {
nodes[idx].link = format_url(href, config);
nodes[idx].link_target = target.clone();
}
}
ClickAction::Callback { .. } => {
if security_level_loose {
if let Some(&idx) = node_index.get(id) {
nodes[idx].have_callback = true;
}
}
}
}
}
}
Stmt::LinkStyle(ls) => {
if let Some(algo) = &ls.interpolate {
for pos in &ls.positions {
match pos {
LinkStylePos::Default => edge_defaults.interpolate = Some(algo.clone()),
LinkStylePos::Index(i) => {
if *i >= edges.len() {
return Err(Error::DiagramParse {
diagram_type: diagram_type.to_string(),
message: format!(
"The index {i} for linkStyle is out of bounds. Valid indices for linkStyle are between 0 and {}. (Help: Ensure that the index is within the range of existing edges.)",
edges.len().saturating_sub(1)
),
});
}
edges[*i].interpolate = Some(algo.clone());
}
}
}
}
if !ls.styles.is_empty() {
for pos in &ls.positions {
match pos {
LinkStylePos::Default => edge_defaults.style = ls.styles.clone(),
LinkStylePos::Index(i) => {
if *i >= edges.len() {
return Err(Error::DiagramParse {
diagram_type: diagram_type.to_string(),
message: format!(
"The index {i} for linkStyle is out of bounds. Valid indices for linkStyle are between 0 and {}. (Help: Ensure that the index is within the range of existing edges.)",
edges.len().saturating_sub(1)
),
});
}
edges[*i].style = ls.styles.clone();
if !edges[*i].style.is_empty()
&& !edges[*i]
.style
.iter()
.any(|s| s.trim_start().starts_with("fill"))
{
edges[*i].style.push("fill:none".to_string());
}
}
}
}
}
}
Stmt::ShapeData { target, yaml } => {
// Mermaid syntax uses the same `@{...}` form for both nodes and edges:
// - if an edge with the given ID exists, it updates the edge metadata
// - otherwise it updates (and may create) a node
let v = parse_shape_data_yaml(yaml).map_err(|e| Error::DiagramParse {
diagram_type: diagram_type.to_string(),
message: format!("Invalid shapeData: {e}"),
})?;
let map = v.as_mapping();
let is_edge_target = edges
.iter()
.any(|e| e.id.as_deref() == Some(target.as_str()));
if is_edge_target {
if let Some(map) = map {
for e in edges.iter_mut() {
if e.id.as_deref() != Some(target.as_str()) {
continue;
}
for (k, v) in map {
let Some(key) = k.as_str() else { continue };
match key {
"animate" => {
if let Some(b) = yaml_to_bool(v) {
e.animate = Some(b);
}
}
"animation" => {
if let Some(s) = yaml_to_string(v) {
e.animation = Some(s);
}
}
"curve" => {
if let Some(s) = yaml_to_string(v) {
e.interpolate = Some(s);
}
}
_ => {}
}
}
}
}
continue;
}
let idx = ensure_node(nodes, node_index, target);
apply_shape_data_to_node(&mut nodes[idx], yaml).map_err(|e| {
Error::DiagramParse {
diagram_type: diagram_type.to_string(),
message: e,
}
})?;
}
Stmt::Chain { .. } | Stmt::Node(_) | Stmt::Direction(_) => {}
}
}
Ok(())
}
fn add_class_to_target(
nodes: &mut [Node],
node_index: &HashMap<String, usize>,
edges: &mut [Edge],
subgraphs: &mut [FlowSubGraph],
subgraph_index: &HashMap<String, usize>,
target: &str,
class_name: &str,
) {
if let Some(&idx) = subgraph_index.get(target) {
subgraphs[idx].classes.push(class_name.to_string());
}
if let Some(&idx) = node_index.get(target) {
nodes[idx].classes.push(class_name.to_string());
}
for e in edges.iter_mut() {
if e.id.as_deref() == Some(target) {
e.classes.push(class_name.to_string());
}
}
}
fn ensure_node(nodes: &mut Vec<Node>, node_index: &mut HashMap<String, usize>, id: &str) -> usize {
if let Some(&idx) = node_index.get(id) {
return idx;
}
let idx = nodes.len();
nodes.push(Node {
id: id.to_string(),
label: None,
label_type: TitleKind::Text,
shape: None,
shape_data: None,
icon: None,
form: None,
pos: None,
img: None,
constraint: None,
asset_width: None,
asset_height: None,
styles: Vec::new(),
classes: Vec::new(),
link: None,
link_target: None,
have_callback: false,
});
node_index.insert(id.to_string(), idx);
idx
}