1 files changed, 129 insertions, 0 deletions

diff --git a/crates/ra_project_model/src/project_json.rs b/crates/ra_project_model/src/project_json.rs
new file mode 100644
index 000000000..b96227949
--- /dev/null
+++ b/crates/ra_project_model/src/project_json.rs
@@ -0,0 +1,129 @@
+//! FIXME: write short doc here
+
+use std::path::PathBuf;
+
+use paths::{AbsPath, AbsPathBuf};
+use ra_cfg::CfgOptions;
+use ra_db::{CrateId, CrateName, Dependency, Edition};
+use rustc_hash::FxHashSet;
+use serde::{de, Deserialize};
+use stdx::split_delim;
+
+/// Roots and crates that compose this Rust project.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct ProjectJson {
+    pub(crate) roots: Vec<Root>,
+    pub(crate) crates: Vec<Crate>,
+}
+
+/// A root points to the directory which contains Rust crates. rust-analyzer watches all files in
+/// all roots. Roots might be nested.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct Root {
+    pub(crate) path: AbsPathBuf,
+}
+
+/// A crate points to the root module of a crate and lists the dependencies of the crate. This is
+/// useful in creating the crate graph.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct Crate {
+    pub(crate) root_module: AbsPathBuf,
+    pub(crate) edition: Edition,
+    pub(crate) deps: Vec<Dependency>,
+    pub(crate) cfg: CfgOptions,
+    pub(crate) target: Option<String>,
+    pub(crate) out_dir: Option<AbsPathBuf>,
+    pub(crate) proc_macro_dylib_path: Option<AbsPathBuf>,
+}
+
+impl ProjectJson {
+    pub fn new(base: &AbsPath, data: ProjectJsonData) -> ProjectJson {
+        ProjectJson {
+            roots: data.roots.into_iter().map(|path| Root { path: base.join(path) }).collect(),
+            crates: data
+                .crates
+                .into_iter()
+                .map(|crate_data| Crate {
+                    root_module: base.join(crate_data.root_module),
+                    edition: crate_data.edition.into(),
+                    deps: crate_data
+                        .deps
+                        .into_iter()
+                        .map(|dep_data| Dependency {
+                            crate_id: CrateId(dep_data.krate as u32),
+                            name: dep_data.name,
+                        })
+                        .collect::<Vec<_>>(),
+                    cfg: {
+                        let mut cfg = CfgOptions::default();
+                        for entry in &crate_data.cfg {
+                            match split_delim(entry, '=') {
+                                Some((key, value)) => {
+                                    cfg.insert_key_value(key.into(), value.into());
+                                }
+                                None => cfg.insert_atom(entry.into()),
+                            }
+                        }
+                        cfg
+                    },
+                    target: crate_data.target,
+                    out_dir: crate_data.out_dir.map(|it| base.join(it)),
+                    proc_macro_dylib_path: crate_data.proc_macro_dylib_path.map(|it| base.join(it)),
+                })
+                .collect::<Vec<_>>(),
+        }
+    }
+}
+
+#[derive(Deserialize)]
+pub struct ProjectJsonData {
+    roots: Vec<PathBuf>,
+    crates: Vec<CrateData>,
+}
+
+#[derive(Deserialize)]
+struct CrateData {
+    root_module: PathBuf,
+    edition: EditionData,
+    deps: Vec<DepData>,
+    #[serde(default)]
+    cfg: FxHashSet<String>,
+    target: Option<String>,
+    out_dir: Option<PathBuf>,
+    proc_macro_dylib_path: Option<PathBuf>,
+}
+
+#[derive(Deserialize)]
+#[serde(rename = "edition")]
+enum EditionData {
+    #[serde(rename = "2015")]
+    Edition2015,
+    #[serde(rename = "2018")]
+    Edition2018,
+}
+
+impl From<EditionData> for Edition {
+    fn from(data: EditionData) -> Self {
+        match data {
+            EditionData::Edition2015 => Edition::Edition2015,
+            EditionData::Edition2018 => Edition::Edition2018,
+        }
+    }
+}
+
+#[derive(Deserialize)]
+struct DepData {
+    /// Identifies a crate by position in the crates array.
+    #[serde(rename = "crate")]
+    krate: usize,
+    #[serde(deserialize_with = "deserialize_crate_name")]
+    name: CrateName,
+}
+
+fn deserialize_crate_name<'de, D>(de: D) -> Result<CrateName, D::Error>
+where
+    D: de::Deserializer<'de>,
+{
+    let name = String::deserialize(de)?;
+    CrateName::new(&name).map_err(|err| de::Error::custom(format!("invalid crate name: {:?}", err)))
+}