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/*
* We implement most aspects of paths independently, not relying on
* std::path, on the theory that path syntax is such an important part of a
* shell that it doesn't make sense to try to integrate with non-Unix syntaxes.
* However, we do use std::path to print individual path components, in order
* to get the benefit of its functionality for handling non-Unicode filenames.
*/
use crate::prelude::*;
lalrpop_mod!(pub parser, "/path/parser.rs");
#[derive(Debug)]
pub struct AbsoluteDirectoryPath {
components: Vec<DirectoryName>,
}
#[derive(Debug)]
pub struct FileName(String);
#[derive(Debug)]
pub struct DirectoryName(String);
#[derive(Debug)]
pub struct GenericPath {
components: Vec<GenericPathComponent>,
starts_with_slash: bool,
ends_with_slash: bool,
}
#[derive(Debug)]
pub enum GenericPathComponent {
FileOrDirectoryName(String),
CurrentDirectory,
ParentDirectory,
}
impl std::fmt::Display for AbsoluteDirectoryPath {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
for component in &self.components {
f.write_str("/")?;
component.fmt(f)?;
}
f.write_str("/")?;
Ok(())
}
}
impl std::fmt::Display for FileName {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
FileName(name) => {
let std_path = std::path::Path::new(&name);
f.write_fmt(format_args!("{}", std_path.display()))?;
},
}
Ok(())
}
}
impl std::fmt::Display for DirectoryName {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
DirectoryName(name) => {
let std_path = std::path::Path::new(&name);
f.write_fmt(format_args!("{}", std_path.display()))?;
},
}
Ok(())
}
}
impl std::fmt::Display for GenericPath {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
if self.starts_with_slash {
f.write_str("/")?;
}
let mut is_first = true;
for component in &self.components {
if !is_first {
f.write_str("/")?;
}
component.fmt(f)?;
is_first = false;
}
if self.ends_with_slash {
f.write_str("/")?;
}
Ok(())
}
}
impl std::fmt::Display for GenericPathComponent {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
GenericPathComponent::FileOrDirectoryName(name) => {
let std_path = std::path::Path::new(&name);
f.write_fmt(format_args!("{}", std_path.display()))?;
},
GenericPathComponent::CurrentDirectory => {
f.write_str(".")?;
},
GenericPathComponent::ParentDirectory => {
f.write_str("..")?;
},
}
Ok(())
}
}
pub fn parse_path_list(path_list: &str)
-> Result<Vec<AbsoluteDirectoryPath>>
{
match parser::PathListParser::new().parse(path_list) {
Ok(parsed_paths) => {
let mut result = Vec::new();
for generic_path in parsed_paths {
let path = absolute_directory_path(generic_path)?;
result.push(path);
}
Ok(result)
},
Err(original_error) => {
match parser::PathListAllowingEmptyPathsParser::new()
.parse(path_list)
{
Ok(_) => {
Err(Error::PathListHasEmptyComponents(path_list.to_string()))
},
Err(_) => {
Err(Error::Parse(original_error.to_string()))
},
}
},
}
}
pub fn absolute_directory_path(generic_path: GenericPath)
-> Result<AbsoluteDirectoryPath>
{
if !generic_path.starts_with_slash {
return Err(Error::PathIsRelative(generic_path));
}
let mut flattened_components = Vec::new();
for component in &generic_path.components {
match component {
GenericPathComponent::CurrentDirectory => { },
GenericPathComponent::ParentDirectory => {
if flattened_components.len() > 0 {
flattened_components.pop();
} else {
return Err(Error::PathInvalid(generic_path));
}
},
GenericPathComponent::FileOrDirectoryName(name) => {
flattened_components.push(DirectoryName(name.to_string()));
},
}
}
if flattened_components.len() == 0 {
return Err(Error::PathInvalid(generic_path));
}
Ok(AbsoluteDirectoryPath {
components: flattened_components,
})
}
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