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use source::SrcPos;
use std::convert::{AsRef, Into};
#[derive(PartialEq, Debug, Clone, Copy, Eq, Hash)]
pub enum Severity {
Hint,
Info,
Warning,
Error,
}
#[must_use]
#[derive(PartialEq, Debug, Clone, Eq, Hash)]
pub struct Message {
pub pos: SrcPos,
pub message: String,
pub severity: Severity,
pub related: Vec<(SrcPos, String)>,
}
impl Message {
pub fn new(item: impl AsRef<SrcPos>, msg: impl Into<String>, severity: Severity) -> Message {
Message {
pos: item.as_ref().clone(),
message: msg.into(),
severity: severity,
related: vec![],
}
}
pub fn error(item: impl AsRef<SrcPos>, msg: impl Into<String>) -> Message {
Self::new(item, msg, Severity::Error)
}
pub fn warning(item: impl AsRef<SrcPos>, msg: impl Into<String>) -> Message {
Self::new(item, msg, Severity::Warning)
}
pub fn hint(item: impl AsRef<SrcPos>, msg: impl Into<String>) -> Message {
Self::new(item, msg, Severity::Hint)
}
pub fn info(item: impl AsRef<SrcPos>, msg: impl Into<String>) -> Message {
Self::new(item, msg, Severity::Info)
}
pub fn when(self, message: impl AsRef<str>) -> Message {
Message {
message: format!("{}, when {}", &self.message, message.as_ref()),
pos: self.pos,
severity: self.severity,
related: vec![],
}
}
pub fn related(self, item: impl AsRef<SrcPos>, message: impl Into<String>) -> Message {
let mut msg = self;
msg.add_related(item, message);
msg
}
pub fn add_related(&mut self, item: impl AsRef<SrcPos>, message: impl Into<String>) {
self.related
.push((item.as_ref().to_owned(), message.into()));
}
pub fn drain_related(&mut self) -> Vec<Message> {
let mut messages = Vec::with_capacity(self.related.len());
let related = std::mem::replace(&mut self.related, Vec::new());
for (pos, msg) in related {
messages.push(Message::new(
pos,
format!("related: {}", msg),
Severity::Hint,
));
}
messages
}
pub fn show(&self) -> String {
let mut result = String::new();
for (pos, message) in self.related.iter() {
result.push_str(&pos.show(&format!("related: {}", message)));
result.push('\n');
}
let severity = match self.severity {
Severity::Error => &"error",
Severity::Warning => &"warning",
Severity::Info => &"info",
Severity::Hint => &"hint",
};
result.push_str(&self.pos.show(&format!("{}: {}", severity, self.message)));
result
}
}
pub trait MessageHandler {
fn push(self: &mut Self, err: Message);
}
pub fn push_result<T>(messages: &mut MessageHandler, msg: Result<T, Message>) {
if let Err(msg) = msg {
messages.push(msg);
}
}
pub fn push_some(messages: &mut MessageHandler, msg: Option<Message>) {
if let Some(msg) = msg {
messages.push(msg);
}
}
impl MessageHandler for Vec<Message> {
fn push(self: &mut Self, msg: Message) {
self.push(msg)
}
}
pub type ParseResult<T> = Result<T, Message>;
#[cfg(test)]
mod tests {
use super::*;
use test_util::Code;
#[test]
fn show_warning() {
let code = Code::new("hello\nworld\nline\n");
assert_eq!(
Message::warning(code.s1("world"), "Greetings").show(),
"\
warning: Greetings
--> {unknown file}:2
|
1 | hello
2 --> world
| ~~~~~
3 | line
"
);
}
#[test]
fn show_error() {
let code = Code::new("hello\nworld\nline\n");
assert_eq!(
Message::error(code.s1("world"), "Greetings").show(),
"\
error: Greetings
--> {unknown file}:2
|
1 | hello
2 --> world
| ~~~~~
3 | line
"
);
}
#[test]
fn show_related() {
let code = Code::new("hello\nworld\nline\n");
let err =
Message::error(code.s1("line"), "Greetings").related(code.s1("hello"), "From here");
assert_eq!(
err.show(),
"\
related: From here
--> {unknown file}:1
|
1 --> hello
| ~~~~~
2 | world
3 | line
error: Greetings
--> {unknown file}:3
|
1 | hello
2 | world
3 --> line
| ~~~~
"
);
}
}