1 files changed, 149 insertions, 0 deletions

diff --git a/crates/ra_ide/src/mock_analysis.rs b/crates/ra_ide/src/mock_analysis.rs
new file mode 100644
index 000000000..bf8a54932
--- /dev/null
+++ b/crates/ra_ide/src/mock_analysis.rs
@@ -0,0 +1,149 @@
+//! FIXME: write short doc here
+
+use std::sync::Arc;
+
+use ra_cfg::CfgOptions;
+use ra_db::{Env, RelativePathBuf};
+use test_utils::{extract_offset, extract_range, parse_fixture, CURSOR_MARKER};
+
+use crate::{
+    Analysis, AnalysisChange, AnalysisHost, CrateGraph, Edition::Edition2018, FileId, FilePosition,
+    FileRange, SourceRootId,
+};
+
+/// Mock analysis is used in test to bootstrap an AnalysisHost/Analysis
+/// from a set of in-memory files.
+#[derive(Debug, Default)]
+pub struct MockAnalysis {
+    files: Vec<(String, String)>,
+}
+
+impl MockAnalysis {
+    pub fn new() -> MockAnalysis {
+        MockAnalysis::default()
+    }
+    /// Creates `MockAnalysis` using a fixture data in the following format:
+    ///
+    /// ```not_rust
+    /// //- /main.rs
+    /// mod foo;
+    /// fn main() {}
+    ///
+    /// //- /foo.rs
+    /// struct Baz;
+    /// ```
+    pub fn with_files(fixture: &str) -> MockAnalysis {
+        let mut res = MockAnalysis::new();
+        for entry in parse_fixture(fixture) {
+            res.add_file(&entry.meta, &entry.text);
+        }
+        res
+    }
+
+    /// Same as `with_files`, but requires that a single file contains a `<|>` marker,
+    /// whose position is also returned.
+    pub fn with_files_and_position(fixture: &str) -> (MockAnalysis, FilePosition) {
+        let mut position = None;
+        let mut res = MockAnalysis::new();
+        for entry in parse_fixture(fixture) {
+            if entry.text.contains(CURSOR_MARKER) {
+                assert!(position.is_none(), "only one marker (<|>) per fixture is allowed");
+                position = Some(res.add_file_with_position(&entry.meta, &entry.text));
+            } else {
+                res.add_file(&entry.meta, &entry.text);
+            }
+        }
+        let position = position.expect("expected a marker (<|>)");
+        (res, position)
+    }
+
+    pub fn add_file(&mut self, path: &str, text: &str) -> FileId {
+        let file_id = FileId((self.files.len() + 1) as u32);
+        self.files.push((path.to_string(), text.to_string()));
+        file_id
+    }
+    pub fn add_file_with_position(&mut self, path: &str, text: &str) -> FilePosition {
+        let (offset, text) = extract_offset(text);
+        let file_id = FileId((self.files.len() + 1) as u32);
+        self.files.push((path.to_string(), text));
+        FilePosition { file_id, offset }
+    }
+    pub fn add_file_with_range(&mut self, path: &str, text: &str) -> FileRange {
+        let (range, text) = extract_range(text);
+        let file_id = FileId((self.files.len() + 1) as u32);
+        self.files.push((path.to_string(), text));
+        FileRange { file_id, range }
+    }
+    pub fn id_of(&self, path: &str) -> FileId {
+        let (idx, _) = self
+            .files
+            .iter()
+            .enumerate()
+            .find(|(_, (p, _text))| path == p)
+            .expect("no file in this mock");
+        FileId(idx as u32 + 1)
+    }
+    pub fn analysis_host(self) -> AnalysisHost {
+        let mut host = AnalysisHost::default();
+        let source_root = SourceRootId(0);
+        let mut change = AnalysisChange::new();
+        change.add_root(source_root, true);
+        let mut crate_graph = CrateGraph::default();
+        let mut root_crate = None;
+        for (i, (path, contents)) in self.files.into_iter().enumerate() {
+            assert!(path.starts_with('/'));
+            let path = RelativePathBuf::from_path(&path[1..]).unwrap();
+            let file_id = FileId(i as u32 + 1);
+            let cfg_options = CfgOptions::default();
+            if path == "/lib.rs" || path == "/main.rs" {
+                root_crate = Some(crate_graph.add_crate_root(
+                    file_id,
+                    Edition2018,
+                    cfg_options,
+                    Env::default(),
+                ));
+            } else if path.ends_with("/lib.rs") {
+                let other_crate =
+                    crate_graph.add_crate_root(file_id, Edition2018, cfg_options, Env::default());
+                let crate_name = path.parent().unwrap().file_name().unwrap();
+                if let Some(root_crate) = root_crate {
+                    crate_graph.add_dep(root_crate, crate_name.into(), other_crate).unwrap();
+                }
+            }
+            change.add_file(source_root, file_id, path, Arc::new(contents));
+        }
+        change.set_crate_graph(crate_graph);
+        host.apply_change(change);
+        host
+    }
+    pub fn analysis(self) -> Analysis {
+        self.analysis_host().analysis()
+    }
+}
+
+/// Creates analysis from a multi-file fixture, returns positions marked with <|>.
+pub fn analysis_and_position(fixture: &str) -> (Analysis, FilePosition) {
+    let (mock, position) = MockAnalysis::with_files_and_position(fixture);
+    (mock.analysis(), position)
+}
+
+/// Creates analysis for a single file.
+pub fn single_file(code: &str) -> (Analysis, FileId) {
+    let mut mock = MockAnalysis::new();
+    let file_id = mock.add_file("/main.rs", code);
+    (mock.analysis(), file_id)
+}
+
+/// Creates analysis for a single file, returns position marked with <|>.
+pub fn single_file_with_position(code: &str) -> (Analysis, FilePosition) {
+    let mut mock = MockAnalysis::new();
+    let pos = mock.add_file_with_position("/main.rs", code);
+    (mock.analysis(), pos)
+}
+
+/// Creates analysis for a single file, returns range marked with a pair of <|>.
+pub fn single_file_with_range(code: &str) -> (Analysis, FileRange) {
+    let mut mock = MockAnalysis::new();
+    let pos = mock.add_file_with_range("/main.rs", code);
+    (mock.analysis(), pos)
+}