vault_tasks_core/parser/parser_file_entry.rs
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use std::iter::Peekable;
use color_eyre::{eyre::bail, Result};
use tracing::{debug, error};
use winnow::{
ascii::{space0, space1},
combinator::{alt, preceded, repeat},
token::{take_till, take_while},
PResult, Parser,
};
use crate::{task::Task, vault_data::VaultData, TasksConfig};
use super::task::parse_task;
enum FileToken {
/// Name, Heading level
Header((String, usize)),
/// Content, Indent length
Description(String, usize),
/// Task, Indent length
Task(Task, usize),
/// A tag found outside a task in the file
FileTag(String),
}
#[allow(clippy::module_name_repetitions)]
pub struct ParserFileEntry<'a> {
pub config: &'a TasksConfig,
pub filename: String,
}
impl ParserFileEntry<'_> {
fn parse_indent(input: &mut &str) -> PResult<usize> {
let indent_length: String = repeat(1.., " ").parse_next(input)?;
Ok(indent_length.len())
}
fn parse_task(&self, input: &mut &str) -> PResult<FileToken> {
let indent_length = Self::parse_indent(input).unwrap_or(0);
let mut task_parser =
|input: &mut &str| parse_task(input, self.filename.clone(), self.config);
let task_res = task_parser.parse_next(input)?;
Ok(FileToken::Task(task_res, indent_length))
}
fn parse_header(input: &mut &str) -> PResult<FileToken> {
let header_depth: String = repeat(1.., "#").parse_next(input)?;
let header_content = preceded(space0, take_till(1.., |c| c == '\n')).parse_next(input)?;
Ok(FileToken::Header((
header_content.to_string(),
header_depth.len(),
)))
}
fn parse_description(input: &mut &str) -> PResult<FileToken> {
let indent_length = space1.map(|s: &str| s.len()).parse_next(input)?;
let desc_content = take_till(1.., |c| c == '\n').parse_next(input)?;
Ok(FileToken::Description(
desc_content.to_string(),
indent_length,
))
}
fn parse_file_tag(input: &mut &str) -> PResult<FileToken> {
let tag = preceded(
'#',
take_while(1.., ('_', '0'..='9', 'A'..='Z', 'a'..='z', '0'..='9')),
)
.parse_next(input)?;
Ok(FileToken::FileTag(tag.to_owned()))
}
fn insert_task_at(
file_entry: &mut VaultData,
task: Task,
header_depth: usize,
indent_length: usize,
) -> Result<()> {
fn append_task_aux(
file_entry: &mut VaultData,
task_to_insert: Task,
current_header_depth: usize,
target_header_depth: usize,
current_task_depth: usize,
target_task_depth: usize,
) -> Result<()> {
match file_entry {
VaultData::Header(_, _, header_children) => {
match current_header_depth.cmp(&target_header_depth) {
std::cmp::Ordering::Greater => panic!("Target header level was greater than current level which is impossible"), // shouldn't happen
std::cmp::Ordering::Equal => {
// Found correct header level
if current_task_depth == target_task_depth {
header_children.push(VaultData::Task(task_to_insert));
Ok(())
} else {
for child in header_children.iter_mut().rev() {
if let VaultData::Task(_task) = child {
return append_task_aux(
child,
task_to_insert,
current_header_depth,
target_header_depth,
current_task_depth + 1,
target_task_depth,
);
}
}
bail!("Cound't find correct parent task to insert task {}", task_to_insert.name)
}
}
std::cmp::Ordering::Less => {
// Going deeper in header levels
for child in header_children.iter_mut().rev() {
if let VaultData::Header(_,_, _) = child {
return append_task_aux(
child,
task_to_insert,
current_header_depth + 1,
target_header_depth,
current_task_depth,
target_task_depth,
);
}
}
bail!("Cound't find correct parent header to insert task {}", task_to_insert.name)
}
}
}
VaultData::Task(task) => {
let mut current_task_depth = current_task_depth;
let mut last_task = task;
while current_task_depth < target_task_depth {
if last_task.subtasks.is_empty() {
error!("Could not find parent task, indenting may be wrong. Closest task line number: {}",last_task.line_number);
bail!("Failed to insert task")
}
last_task = last_task.subtasks.last_mut().unwrap();
current_task_depth += 1;
}
last_task.subtasks.push(task_to_insert);
Ok(())
}
VaultData::Directory(_, _) => {
bail!("Failed to insert task: tried to insert into a directory")
}
}
}
append_task_aux(file_entry, task, 0, header_depth, 0, indent_length)
}
/// Inserts a `FileEntry` at the specific header `depth` in `file_entry`.
fn insert_header_at(
file_entry: &mut VaultData,
object: VaultData,
target_header_depth: usize,
target_task_depth: usize,
) {
fn insert_at_aux(
file_entry: &mut VaultData,
object: VaultData,
current_header_depth: usize,
target_header_depth: usize,
current_task_depth: usize,
target_task_depth: usize,
) {
match file_entry {
VaultData::Header(_, _, header_children) => {
match (current_header_depth).cmp(&target_header_depth) {
std::cmp::Ordering::Greater => error!(
"bad call to `insert_at`, file_entry:{file_entry}\nobject:{object}"
), // shouldn't happen
std::cmp::Ordering::Equal => {
// Found correct header level
if current_task_depth == target_task_depth {
header_children.push(object);
} else {
for child in header_children.iter_mut().rev() {
if let VaultData::Task(_) = child {
return insert_at_aux(
child,
object,
current_header_depth,
target_header_depth,
current_task_depth + 1,
target_task_depth,
);
}
}
}
}
std::cmp::Ordering::Less => {
// Still haven't found correct header level, going deeper
for child in header_children.iter_mut().rev() {
if let VaultData::Header(_, _, _) = child {
insert_at_aux(
child,
object,
current_header_depth + 1,
target_header_depth,
current_task_depth,
target_task_depth,
);
return;
}
}
header_children.push(object);
}
}
}
VaultData::Task(_) => {
error!("Error: tried to insert a header into a task");
}
VaultData::Directory(name, _) => {
error!("Error: tried to insert a header into a directory : {name}");
}
}
}
insert_at_aux(
file_entry,
object,
0,
target_header_depth,
0,
target_task_depth,
);
}
/// Appends `desc` to the description of an existing `Task` in the `FileEntry`.
fn append_description(
file_entry: &mut VaultData,
desc: String,
target_header_depth: usize,
target_task_depth: usize,
) -> Result<()> {
fn append_description_aux(
file_entry: &mut VaultData,
desc: String,
current_header_depth: usize,
target_header_depth: usize,
current_task_depth: usize,
target_task_depth: usize,
) -> Result<()> {
match file_entry {
VaultData::Header(_, _, header_children) => {
match current_header_depth.cmp(&target_header_depth) {
std::cmp::Ordering::Greater => panic!("bad call for desc"), // shouldn't happen
std::cmp::Ordering::Equal => {
// Found correct header level
for child in header_children.iter_mut().rev() {
if let VaultData::Task(mut task) = child.clone() {
if current_task_depth == target_task_depth {
match &mut task.description {
Some(d) => {
d.push('\n');
d.push_str(&desc.clone());
}
None => task.description = Some(desc.clone()),
}
*child = VaultData::Task(task);
} else {
return append_description_aux(
child,
desc,
current_header_depth,
target_header_depth,
current_task_depth + 1,
target_task_depth,
);
}
}
}
Ok(())
}
std::cmp::Ordering::Less => {
// Going deeper in header levels
for child in header_children.iter_mut().rev() {
if let VaultData::Header(_, _, _) = child {
return append_description_aux(
child,
desc,
current_header_depth + 1,
target_header_depth,
current_task_depth,
target_task_depth,
);
}
}
bail!("Failed to insert description: previous task not found");
}
}
}
VaultData::Task(task) => {
fn insert_desc_task(
description: String,
task: &mut Task,
current_level: usize,
target_level: usize,
) -> Result<()> {
if current_level == target_level {
match &mut task.description {
Some(d) => {
d.push('\n');
d.push_str(&description);
Ok(())
}
None => {
task.description = Some(description.clone());
Ok(())
}
}
} else if let Some(task) = task.subtasks.last_mut() {
insert_desc_task(description, task, current_level + 1, target_level)
} else {
debug!("Description was too indented, adding to closest task: {description}");
insert_desc_task(description, task, current_level + 1, target_level)
}
}
insert_desc_task(desc, task, current_task_depth, target_task_depth)
}
VaultData::Directory(_, _) => {
bail!("Failed to insert description: tried to insert into a directory")
}
}
}
append_description_aux(
file_entry,
desc,
0,
target_header_depth,
0,
target_task_depth,
)
}
/// Recursively parses the input file passed as a string.
fn parse_file_aux<'a, I>(
&self,
mut input: Peekable<I>,
file_entry: &mut VaultData,
file_tags: &mut Vec<String>,
header_depth: usize,
) where
I: Iterator<Item = (usize, &'a str)>,
{
let mut parser = alt((
Self::parse_file_tag,
Self::parse_header,
|input: &mut &str| self.parse_task(input),
Self::parse_description,
));
let line_opt = input.next();
if line_opt.is_none() {
return;
}
let (line_number, mut line) = line_opt.unwrap();
match parser.parse_next(&mut line) {
Ok(FileToken::Task(mut task, indent_length)) => {
task.line_number = line_number + 1; // line 1 was element 0 of iterator
if Self::insert_task_at(
file_entry,
task,
header_depth,
indent_length / self.config.indent_length,
)
.is_err()
{
error!("Failed to insert task");
}
self.parse_file_aux(input, file_entry, file_tags, header_depth);
}
Ok(FileToken::Header((header, new_depth))) => {
Self::insert_header_at(
file_entry,
VaultData::Header(new_depth, header, vec![]),
new_depth - 1,
0,
);
self.parse_file_aux(input, file_entry, file_tags, new_depth);
}
Ok(FileToken::Description(description, indent_length)) => {
if Self::append_description(
file_entry,
description.clone(),
header_depth,
indent_length / self.config.indent_length,
)
.is_err()
{
error!("Failed to insert description {description}");
}
self.parse_file_aux(input, file_entry, file_tags, header_depth);
}
Ok(FileToken::FileTag(tag)) => {
if !file_tags.contains(&tag) {
file_tags.push(tag);
}
self.parse_file_aux(input, file_entry, file_tags, header_depth);
}
Err(_) => self.parse_file_aux(input, file_entry, file_tags, header_depth),
}
}
/// Removes any empty headers from a `FileEntry`
fn clean_file_entry(file_entry: &mut VaultData) -> Option<&VaultData> {
match file_entry {
VaultData::Header(_, _, children) | VaultData::Directory(_, children) => {
let mut actual_children = vec![];
for child in children.iter_mut() {
let mut child_clone = child.clone();
if Self::clean_file_entry(&mut child_clone).is_some() {
actual_children.push(child_clone);
}
}
*children = actual_children;
if children.is_empty() {
None
} else {
Some(file_entry)
}
}
VaultData::Task(_) => Some(file_entry),
}
}
pub fn parse_file(&mut self, filename: &str, input: &&str) -> Option<VaultData> {
let lines = input.split('\n');
let mut res = VaultData::Header(0, filename.to_owned(), vec![]);
let mut file_tags = vec![];
self.filename = filename.to_string();
self.parse_file_aux(lines.enumerate().peekable(), &mut res, &mut file_tags, 0);
if self.config.file_tags_propagation {
file_tags.iter().for_each(|t| add_global_tag(&mut res, t));
}
// Filename is changed from Header to Directory variant at the end
if let Some(VaultData::Header(_, name, children)) = Self::clean_file_entry(&mut res) {
Some(VaultData::Directory(name.clone(), children.clone()))
} else {
None
}
}
}
fn add_global_tag(file_entry: &mut VaultData, tag: &String) {
fn add_tag_aux(file_entry: &mut VaultData, tag: &String) {
match file_entry {
VaultData::Header(_, _, children) | VaultData::Directory(_, children) => {
for child in children.iter_mut().rev() {
add_tag_aux(child, tag);
}
}
VaultData::Task(task) => {
fn insert_tag_task(task: &mut Task, tag: &String) {
match task.tags.clone() {
Some(mut tags) if !tags.contains(tag) => {
tags.push(tag.to_string());
task.tags = Some(tags);
}
None => task.tags = Some(vec![tag.to_string()]),
_ => (),
}
for st in &mut task.subtasks {
insert_tag_task(st, tag);
}
}
insert_tag_task(task, tag);
}
}
}
add_tag_aux(file_entry, tag);
}
#[cfg(test)]
mod tests {
use insta::assert_snapshot;
use super::ParserFileEntry;
use crate::{
parser::parser_file_entry::add_global_tag, task::Task, vault_data::VaultData, TasksConfig,
};
#[test]
fn test_with_useless_headers() {
let input = r"# 1 useless
## 2 useless
### 3 useless
# 2 useful
### 3 useless
## 4 useful
- [ ] test
test
desc
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
let expected = VaultData::Header(
0,
"Test".to_string(),
vec![
VaultData::Header(
1,
"1 useless".to_string(),
vec![VaultData::Header(
2,
"2 useless".to_string(),
vec![VaultData::Header(3, "3 useless".to_string(), vec![])],
)],
),
VaultData::Header(
1,
"2 useful".to_string(),
vec![
VaultData::Header(3, "3 useless".to_string(), vec![]),
VaultData::Header(
2,
"4 useful".to_string(),
vec![VaultData::Task(Task {
name: "test".to_string(),
line_number: 8,
description: Some("test\ndesc".to_string()),
..Default::default()
})],
),
],
),
],
);
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
assert_eq!(res, expected);
let expected_after_cleaning = VaultData::Header(
0,
"Test".to_string(),
vec![VaultData::Header(
1,
"2 useful".to_string(),
vec![VaultData::Header(
2,
"4 useful".to_string(),
vec![VaultData::Task(Task {
name: "test".to_string(),
line_number: 8,
description: Some("test\ndesc".to_string()),
..Default::default()
})],
)],
)],
);
ParserFileEntry::clean_file_entry(&mut res);
assert_eq!(res, expected_after_cleaning);
}
#[test]
fn test_simple_input() {
let input = r"# 1 Header
- [ ] Task
## 2 Header
### 3 Header
- [ ] Task
- [ ] Task 2
## 2 Header 2
- [ ] Task
Description
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
let expected = VaultData::Header(
0,
"Test".to_string(),
vec![VaultData::Header(
1,
"1 Header".to_string(),
vec![
VaultData::Task(Task {
name: "Task".to_string(),
line_number: 2,
..Default::default()
}),
VaultData::Header(
2,
"2 Header".to_string(),
vec![VaultData::Header(
3,
"3 Header".to_string(),
vec![
VaultData::Task(Task {
name: "Task".to_string(),
line_number: 6,
..Default::default()
}),
VaultData::Task(Task {
name: "Task 2".to_string(),
line_number: 7,
..Default::default()
}),
],
)],
),
VaultData::Header(
2,
"2 Header 2".to_string(),
vec![VaultData::Task(Task {
name: "Task".to_string(),
line_number: 9,
description: Some("Description".to_string()),
..Default::default()
})],
),
],
)],
);
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
assert_eq!(res, expected);
}
#[test]
fn test_insert_global_tag() {
let input = r"# 1 Header
- [ ] Task
## 2 Header
### 3 Header
- [ ] Task
- [ ] Task 2
## 2 Header 2
- [ ] Task
Description
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
add_global_tag(&mut res, &String::from("test"));
assert_snapshot!(res);
}
#[test]
fn test_fake_description() {
let input = r"# 1 Header
test
- [ ] Task
## 2 Header
test
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
let expected = VaultData::Header(
0,
"Test".to_string(),
vec![VaultData::Header(
1,
"1 Header".to_string(),
vec![
VaultData::Task(Task {
name: "Task".to_string(),
line_number: 3,
..Default::default()
}),
VaultData::Header(2, "2 Header".to_string(), vec![]),
],
)],
);
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
assert_eq!(res, expected);
}
#[test]
fn test_nested_tasks() {
let input = r"# 1 Header
## Test
- [ ] Test a
- [ ] Test b
- [ ] Test c
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
let expected = VaultData::Header(
0,
"Test".to_string(),
vec![VaultData::Header(
1,
"1 Header".to_string(),
vec![VaultData::Header(
2,
"Test".to_string(),
vec![VaultData::Task(Task {
name: "Test a".to_string(),
line_number: 3,
subtasks: vec![Task {
name: "Test b".to_string(),
line_number: 4,
subtasks: vec![Task {
name: "Test c".to_string(),
line_number: 5,
..Default::default()
}],
..Default::default()
}],
..Default::default()
})],
)],
)],
);
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
println!("{res:#?}");
assert_eq!(res, expected);
}
#[test]
fn test_nested_tasks_desc() {
let input = r"# 1 Header
- [ ] t1
t1
- [ ] t2
t2
t1
t2
- [ ] t3
t2
t1
t3
t1
- [ ] t4
t2
t4
t3
t4
"
.split('\n')
.enumerate()
.peekable();
let config = TasksConfig {
indent_length: 2,
..Default::default()
};
let mut res = VaultData::Header(0, "Test".to_string(), vec![]);
let parser = ParserFileEntry {
config: &config,
filename: String::new(),
};
parser.parse_file_aux(input, &mut res, &mut vec![], 0);
assert_snapshot!(res);
}
}