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functions.rs
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// -*- coding: utf-8 -*-
// ------------------------------------------------------------------------------------------------
// Copyright © 2021, stack-graphs authors.
// Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
// Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
// ------------------------------------------------------------------------------------------------
//! Define tree-sitter-graph functions
pub use path::add_path_functions;
pub mod path {
use std::path::Component;
use std::path::Path;
use std::path::PathBuf;
use tree_sitter_graph::functions::Function;
use tree_sitter_graph::functions::Functions;
use tree_sitter_graph::functions::Parameters;
use tree_sitter_graph::graph::Graph;
use tree_sitter_graph::graph::Value;
use tree_sitter_graph::ExecutionError;
pub fn add_path_functions(functions: &mut Functions) {
functions.add(
"path-dir".into(),
path_fn(|p| p.parent().map(|s| s.as_os_str().to_os_string())),
);
functions.add(
"path-fileext".into(),
path_fn(|p| p.extension().map(|s| s.to_os_string())),
);
functions.add(
"path-filename".into(),
path_fn(|p| p.file_name().map(|s| s.to_os_string())),
);
functions.add(
"path-filestem".into(),
path_fn(|p| p.file_stem().map(|s| s.to_os_string())),
);
functions.add("path-join".into(), PathJoin);
functions.add(
"path-normalize".into(),
path_fn(|p| normalize(p).map(|p| p.as_os_str().to_os_string())),
);
functions.add("path-split".into(), PathSplit);
}
pub fn path_fn<F>(f: F) -> impl Function
where
F: Fn(&Path) -> Option<std::ffi::OsString>,
{
PathFn(f)
}
struct PathFn<F>(F)
where
F: Fn(&Path) -> Option<std::ffi::OsString>;
impl<F> Function for PathFn<F>
where
F: Fn(&Path) -> Option<std::ffi::OsString>,
{
fn call(
&self,
_graph: &mut Graph,
_source: &str,
parameters: &mut dyn Parameters,
) -> Result<Value, ExecutionError> {
let path = PathBuf::from(parameters.param()?.into_string()?);
parameters.finish()?;
let path = self.0(&path);
Ok(path
.map(|s| {
s.into_string()
.unwrap_or_else(|s| s.to_string_lossy().to_string())
.into()
})
.unwrap_or(Value::Null))
}
}
struct PathJoin;
impl Function for PathJoin {
fn call(
&self,
_graph: &mut Graph,
_source: &str,
parameters: &mut dyn Parameters,
) -> Result<Value, ExecutionError> {
let mut path = PathBuf::new();
while let Ok(component) = parameters.param() {
path = path.join(component.into_string()?);
}
Ok(path.to_str().unwrap().into())
}
}
struct PathSplit;
impl Function for PathSplit {
fn call(
&self,
_graph: &mut Graph,
_source: &str,
parameters: &mut dyn Parameters,
) -> Result<Value, ExecutionError> {
let path = PathBuf::from(parameters.param()?.into_string()?);
parameters.finish()?;
let components = path
.components()
.map(|c| c.as_os_str().to_str().unwrap().into())
.collect::<Vec<_>>();
Ok(components.into())
}
}
/// Normalize a path, removing things like `.` and `..` wherever possible.
// Based on the following code from Cargo:
// https://github.com/rust-lang/cargo/blob/e515c3277bf0681bfc79a9e763861bfe26bb05db/crates/cargo-util/src/paths.rs#L73-L106
// Licensed under MIT license & Apache License (Version 2.0)
pub fn normalize(path: &Path) -> Option<PathBuf> {
let mut components = path.components().peekable();
let mut ret = if let Some(c @ Component::Prefix(..)) = components.peek().cloned() {
components.next();
PathBuf::from(c.as_os_str())
} else {
PathBuf::new()
};
let mut has_root = false;
let mut normal_components = 0usize;
for component in components {
match component {
Component::Prefix(..) => unreachable!(),
Component::RootDir => {
has_root = true;
ret.push(component.as_os_str());
}
Component::CurDir => {}
Component::ParentDir => {
if normal_components > 0 {
normal_components -= 1;
ret.pop();
} else if has_root {
return None;
} else {
ret.push(component.as_os_str());
}
}
Component::Normal(c) => {
normal_components += 1;
ret.push(c);
}
}
}
Some(ret)
}
}