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|
use std::{rc::Rc, sync::Arc};
use super::CommandContext;
use crate::{
errors::{CommandResultTrait, CommandSyntaxError},
result_consumer::ResultConsumer,
};
pub struct ContextChain<S, R> {
modifiers: Vec<Rc<CommandContext<S, R>>>,
executable: Rc<CommandContext<S, R>>,
next_stage_cache: Option<Rc<ContextChain<S, R>>>,
}
impl<S, R: CommandResultTrait> ContextChain<S, R> {
pub fn new(
modifiers: Vec<Rc<CommandContext<S, R>>>,
executable: Rc<CommandContext<S, R>>,
) -> Self {
if executable.command.is_none() {
panic!("Last command in chain must be executable");
}
Self {
modifiers,
executable,
next_stage_cache: None,
}
}
pub fn try_flatten(root_context: Rc<CommandContext<S, R>>) -> Option<Self> {
let mut modifiers = Vec::new();
let mut current = root_context;
loop {
let child = current.child.clone();
let Some(child) = child else {
// Last entry must be executable command
current.command.as_ref()?;
return Some(ContextChain::new(modifiers, current));
};
modifiers.push(current);
current = child;
}
}
pub fn run_modifier(
modifier: Rc<CommandContext<S, R>>,
source: Arc<S>,
result_consumer: &dyn ResultConsumer<S, R>,
forked_mode: bool,
) -> Result<Vec<Arc<S>>, CommandSyntaxError> {
let source_modifier = modifier.redirect_modifier();
let Some(source_modifier) = source_modifier else {
return Ok(vec![source]);
};
let context_to_use = Rc::new(modifier.copy_for(source));
let err = match (source_modifier)(&context_to_use) {
Ok(res) => return Ok(res),
Err(e) => e,
};
result_consumer.on_command_complete(context_to_use, false, 0);
if forked_mode {
return Ok(vec![]);
}
Err(err)
}
pub fn run_executable(
&self,
executable: Rc<CommandContext<S, R>>,
source: Arc<S>,
result_consumer: &dyn ResultConsumer<S, R>,
forked_mode: bool,
) -> Result<R, CommandSyntaxError> {
let context_to_use = Rc::new(executable.copy_for(source));
let Some(command) = &executable.command else {
unimplemented!();
};
let res = (command)(&context_to_use);
let err = match res {
Ok(res) => {
let Some(res) = res.as_i32() else {
// these are treated as exceptions, so they can bubble up without doing anything
// else
return Ok(res);
};
result_consumer.on_command_complete(context_to_use, true, res);
return if forked_mode {
Ok(R::new(1))
} else {
Ok(R::new(res))
};
}
Err(err) => err,
};
result_consumer.on_command_complete(context_to_use, false, 0);
if forked_mode { Ok(R::new(0)) } else { Err(err) }
}
pub fn execute_all(
&self,
source: Arc<S>,
result_consumer: &dyn ResultConsumer<S, R>,
) -> Result<R, CommandSyntaxError> {
if self.modifiers.is_empty() {
return self.run_executable(self.executable.clone(), source, result_consumer, false);
}
let mut forked_mode = false;
let mut current_sources = vec![source];
for modifier in &self.modifiers {
forked_mode |= modifier.is_forked();
let mut next_sources = Vec::new();
for source_to_run in current_sources {
match Self::run_modifier(
modifier.clone(),
source_to_run.clone(),
result_consumer,
forked_mode,
) {
Ok(res) => next_sources.extend(res),
Err(err) => return Err(err),
}
}
if next_sources.is_empty() {
return Ok(R::new(0));
}
current_sources = next_sources;
}
let mut summed = 0;
for execution_source in current_sources {
let res = self.run_executable(
self.executable.clone(),
execution_source,
result_consumer,
forked_mode,
)?;
match res.as_i32() {
Some(res) => summed += res,
None => return Ok(res),
}
}
Ok(R::new(summed))
}
pub fn stage(&self) -> Stage {
if self.modifiers.is_empty() {
Stage::Execute
} else {
Stage::Modify
}
}
pub fn top_context(&self) -> Rc<CommandContext<S, R>> {
self.modifiers
.first()
.cloned()
.unwrap_or_else(|| self.executable.clone())
}
pub fn next_stage(&mut self) -> Option<Rc<ContextChain<S, R>>> {
let modifier_count = self.modifiers.len();
if modifier_count == 0 {
return None;
}
if self.next_stage_cache.is_none() {
self.next_stage_cache = Some(Rc::new(ContextChain::new(
self.modifiers[1..].to_vec(),
self.executable.clone(),
)));
}
self.next_stage_cache.clone()
}
}
pub enum Stage {
Modify,
Execute,
}
|
