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use std::{collections::HashSet, io::Write, path::Path};
use crate::{
error::Error,
model::{ActivityType, Bpmn, GatewayType, Symbol},
Process,
};
impl Process {
/// Generate code from all the task and gateways to the given file path.
/// No file with same name is allowed to exist at the target location.
/// ```
/// use snurr::Process;
///
/// fn main() -> Result<(), Box<dyn std::error::Error>> {
/// let bpmn = Process::new("examples/example.bpmn")?;
/// bpmn.scaffold("examples/scaffold.rs")?;
/// Ok(())
/// }
/// ```
pub fn scaffold(&self, path: impl AsRef<Path>) -> Result<(), Error> {
let mut scaffold = Scaffold::default();
self.data.values().for_each(|process: &Vec<Bpmn>| {
process.iter().for_each(|bpmn| {
if let Bpmn::Activity {
activity: ActivityType::Task,
id,
..
} = bpmn
{
let symbols = if let Some(boundaries) = self.boundaries.get(id) {
boundaries
.iter()
.filter_map(|index| process.get(*index))
.filter_map(|bpmn| {
if let Bpmn::Event {
symbol: Some(symbol),
name,
..
} = bpmn
{
Some((name, symbol))
} else {
None
}
})
.collect()
} else {
Vec::new()
};
scaffold.add_task(bpmn, symbols);
}
if let Bpmn::Gateway {
gateway: GatewayType::Exclusive | GatewayType::Inclusive,
outputs,
..
} = bpmn
{
if outputs.len() > 1 {
let names = outputs
.ids()
.iter()
.map(|index| process.get(**index))
.filter_map(|bpmn| {
if let Some(Bpmn::SequenceFlow { name, .. }) = bpmn {
return name.as_ref();
}
None
})
.collect();
scaffold.add_gateway(bpmn, names);
}
}
});
});
scaffold.create(path)
}
}
#[derive(Debug)]
struct Gateway<'a> {
bpmn: &'a Bpmn,
names: Vec<&'a String>,
}
#[derive(Debug)]
struct Task<'a> {
bpmn: &'a Bpmn,
symbols: Vec<(&'a Option<String>, &'a Symbol)>,
}
#[derive(Debug, Default)]
struct Scaffold<'a> {
tasks: Vec<Task<'a>>,
gateways: Vec<Gateway<'a>>,
}
impl<'a> Scaffold<'a> {
fn add_task(&mut self, bpmn: &'a Bpmn, symbols: Vec<(&'a Option<String>, &'a Symbol)>) {
self.tasks.push(Task { bpmn, symbols });
}
fn add_gateway(&mut self, bpmn: &'a Bpmn, names: Vec<&'a String>) {
self.gateways.push(Gateway { bpmn, names });
}
/// Generate code from all the task and gateways to the given file path.
/// No file is allowed to exist at the target location.
fn create(&mut self, path: impl AsRef<Path>) -> Result<(), Error> {
let mut content = vec![];
content.push(
"// Replace the '()' in the Eventhandler<()> return type with your own type.".into(),
);
content.push("pub fn create_handler() -> snurr::Eventhandler<()> {".into());
content.push(" let mut handler = snurr::Eventhandler::default();".into());
// Do not generate duplicates
let mut seen_tasks: HashSet<&String> = HashSet::new();
let mut seen_gateways: HashSet<&String> = HashSet::new();
// First all tasks
for task in self.tasks.iter() {
let Task {
bpmn: Bpmn::Activity { id, name, .. },
symbols,
} = task
else {
continue;
};
let name_or_id = name.as_ref().unwrap_or(id);
if seen_tasks.insert(name_or_id) {
if !symbols.is_empty() {
content.push(format!(
r#" // "{}" boundary symbols: {:?}"#,
name_or_id, symbols
));
}
content.push(format!(
r#" handler.add_task("{}", |input| None);"#,
name_or_id,
));
content.push("".into());
}
}
// Second all gateways
for gateway in self.gateways.iter() {
let Gateway {
bpmn:
Bpmn::Gateway {
gateway,
id,
name,
outputs,
..
},
names,
} = gateway
else {
continue;
};
let name_or_id = name.as_ref().unwrap_or(id);
if seen_gateways.insert(name_or_id) {
content.push(format!(
r#" // {} gateway. Names: {}. Flows: {}."#,
gateway,
names
.iter()
.map(|value| value.to_string())
.collect::<Vec<_>>()
.join(", "),
outputs
));
content.push(format!(
r#" handler.add_gateway("{}", |input| Default::default());"#,
name_or_id,
));
content.push("".into());
}
}
content.push(" handler\n}".into());
let mut file = std::fs::OpenOptions::new()
.create_new(true)
.write(true)
.open(path)?;
file.write_all(content.join("\n").as_bytes())?;
Ok(())
}
}