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use std::fmt;
use anyhow::{bail, Error};
use self::parse::{Parser, RawChunk};
use super::{Graph, Node};
mod parse;
enum Chunk {
Raw(String),
Package,
License,
Repository,
Features,
LibName,
}
pub struct Pattern(Vec<Chunk>);
impl Pattern {
pub fn new(format: &str) -> Result<Pattern, Error> {
let mut chunks = vec![];
for raw in Parser::new(format) {
let chunk = match raw {
RawChunk::Text(text) => Chunk::Raw(text.to_owned()),
RawChunk::Argument("p") => Chunk::Package,
RawChunk::Argument("l") => Chunk::License,
RawChunk::Argument("r") => Chunk::Repository,
RawChunk::Argument("f") => Chunk::Features,
RawChunk::Argument("lib") => Chunk::LibName,
RawChunk::Argument(a) => {
bail!("unsupported pattern `{}`", a);
}
RawChunk::Error(err) => bail!("{}", err),
};
chunks.push(chunk);
}
Ok(Pattern(chunks))
}
pub fn display<'a>(&'a self, graph: &'a Graph<'a>, node_index: usize) -> Display<'a> {
Display {
pattern: self,
graph,
node_index,
}
}
}
pub struct Display<'a> {
pattern: &'a Pattern,
graph: &'a Graph<'a>,
node_index: usize,
}
impl<'a> fmt::Display for Display<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
let node = self.graph.node(self.node_index);
match node {
Node::Package {
package_id,
features,
..
} => {
let package = self.graph.package_for_id(*package_id);
for chunk in &self.pattern.0 {
match chunk {
Chunk::Raw(s) => fmt.write_str(s)?,
Chunk::Package => {
let proc_macro_suffix = if package.proc_macro() {
" (proc-macro)"
} else {
""
};
write!(
fmt,
"{} v{}{}",
package.name(),
package.version(),
proc_macro_suffix
)?;
let source_id = package.package_id().source_id();
if !source_id.is_crates_io() {
write!(fmt, " ({})", source_id)?;
}
}
Chunk::License => {
if let Some(license) = &package.manifest().metadata().license {
write!(fmt, "{}", license)?;
}
}
Chunk::Repository => {
if let Some(repository) = &package.manifest().metadata().repository {
write!(fmt, "{}", repository)?;
}
}
Chunk::Features => {
write!(fmt, "{}", features.join(","))?;
}
Chunk::LibName => {
if let Some(target) = package
.manifest()
.targets()
.iter()
.find(|target| target.is_lib())
{
write!(fmt, "{}", target.crate_name())?;
}
}
}
}
}
Node::Feature { name, node_index } => {
let for_node = self.graph.node(*node_index);
match for_node {
Node::Package { package_id, .. } => {
write!(fmt, "{} feature \"{}\"", package_id.name(), name)?;
if self.graph.is_cli_feature(self.node_index) {
write!(fmt, " (command-line)")?;
}
}
// The node_index in Node::Feature must point to a package
// node, see `add_feature`.
_ => panic!("unexpected feature node {:?}", for_node),
}
}
}
Ok(())
}
}