5 files changed, 120 insertions, 23 deletions

diff --git a/crates/ra_hir_ty/src/tests.rs b/crates/ra_hir_ty/src/tests.rs
index 240cc03a2..087edcc92 100644
--- a/crates/ra_hir_ty/src/tests.rs
+++ b/crates/ra_hir_ty/src/tests.rs
@@ -51,8 +51,8 @@ fn type_at(content: &str) -> String {
     type_at_pos(&db, file_pos)
 }
 
-fn infer(content: &str) -> String {
-    infer_with_mismatches(content, false)
+fn infer(ra_fixture: &str) -> String {
+    infer_with_mismatches(ra_fixture, false)
 }
 
 fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
diff --git a/crates/ra_ide/src/call_info.rs b/crates/ra_ide/src/call_info.rs
index 9a1fc0d35..2b35a3803 100644
--- a/crates/ra_ide/src/call_info.rs
+++ b/crates/ra_ide/src/call_info.rs
@@ -3,7 +3,7 @@ use hir::Semantics;
 use ra_ide_db::RootDatabase;
 use ra_syntax::{
     ast::{self, ArgListOwner},
-    match_ast, AstNode, SyntaxNode,
+    match_ast, AstNode, SyntaxNode, SyntaxToken,
 };
 use test_utils::tested_by;
 
@@ -16,7 +16,13 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
     let file = file.syntax();
     let token = file.token_at_offset(position.offset).next()?;
     let token = sema.descend_into_macros(token);
+    call_info_for_token(&sema, token)
+}
 
+pub(crate) fn call_info_for_token(
+    sema: &Semantics<RootDatabase>,
+    token: SyntaxToken,
+) -> Option<CallInfo> {
     // Find the calling expression and it's NameRef
     let calling_node = FnCallNode::with_node(&token.parent())?;
 
@@ -27,21 +33,23 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
             match callable_def {
                 hir::CallableDef::FunctionId(it) => {
                     let fn_def = it.into();
-                    (CallInfo::with_fn(db, fn_def), fn_def.has_self_param(db))
+                    (CallInfo::with_fn(sema.db, fn_def), fn_def.has_self_param(sema.db))
+                }
+                hir::CallableDef::StructId(it) => {
+                    (CallInfo::with_struct(sema.db, it.into())?, false)
                 }
-                hir::CallableDef::StructId(it) => (CallInfo::with_struct(db, it.into())?, false),
                 hir::CallableDef::EnumVariantId(it) => {
-                    (CallInfo::with_enum_variant(db, it.into())?, false)
+                    (CallInfo::with_enum_variant(sema.db, it.into())?, false)
                 }
             }
         }
         FnCallNode::MethodCallExpr(method_call) => {
             let function = sema.resolve_method_call(&method_call)?;
-            (CallInfo::with_fn(db, function), function.has_self_param(db))
+            (CallInfo::with_fn(sema.db, function), function.has_self_param(sema.db))
         }
         FnCallNode::MacroCallExpr(macro_call) => {
             let macro_def = sema.resolve_macro_call(&macro_call)?;
-            (CallInfo::with_macro(db, macro_def)?, false)
+            (CallInfo::with_macro(sema.db, macro_def)?, false)
         }
     };
 
@@ -61,7 +69,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
                 let num_args_at_callsite = arg_list.args().count();
 
                 let arg_list_range = arg_list.syntax().text_range();
-                if !arg_list_range.contains_inclusive(position.offset) {
+                if !arg_list_range.contains_inclusive(token.text_range().start()) {
                     tested_by!(call_info_bad_offset);
                     return None;
                 }
@@ -70,7 +78,9 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
                     num_args_at_callsite,
                     arg_list
                         .args()
-                        .take_while(|arg| arg.syntax().text_range().end() < position.offset)
+                        .take_while(|arg| {
+                            arg.syntax().text_range().end() < token.text_range().start()
+                        })
                         .count(),
                 );
 
@@ -100,7 +110,13 @@ impl FnCallNode {
             match_ast! {
                 match node {
                     ast::CallExpr(it) => { Some(FnCallNode::CallExpr(it)) },
-                    ast::MethodCallExpr(it) => { Some(FnCallNode::MethodCallExpr(it)) },
+                    ast::MethodCallExpr(it) => {
+                        let arg_list = it.arg_list()?;
+                        if !syntax.text_range().is_subrange(&arg_list.syntax().text_range()) {
+                            return None;
+                        }
+                        Some(FnCallNode::MethodCallExpr(it))
+                    },
                     ast::MacroCall(it) => { Some(FnCallNode::MacroCallExpr(it)) },
                     _ => { None },
                 }
diff --git a/crates/ra_ide/src/mock_analysis.rs b/crates/ra_ide/src/mock_analysis.rs
index 081aaee8c..f4cd6deb7 100644
--- a/crates/ra_ide/src/mock_analysis.rs
+++ b/crates/ra_ide/src/mock_analysis.rs
@@ -124,28 +124,28 @@ impl MockAnalysis {
 }
 
 /// 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);
+pub fn analysis_and_position(ra_fixture: &str) -> (Analysis, FilePosition) {
+    let (mock, position) = MockAnalysis::with_files_and_position(ra_fixture);
     (mock.analysis(), position)
 }
 
 /// Creates analysis for a single file.
-pub fn single_file(code: &str) -> (Analysis, FileId) {
+pub fn single_file(ra_fixture: &str) -> (Analysis, FileId) {
     let mut mock = MockAnalysis::new();
-    let file_id = mock.add_file("/main.rs", code);
+    let file_id = mock.add_file("/main.rs", ra_fixture);
     (mock.analysis(), file_id)
 }
 
 /// Creates analysis for a single file, returns position marked with <|>.
-pub fn single_file_with_position(code: &str) -> (Analysis, FilePosition) {
+pub fn single_file_with_position(ra_fixture: &str) -> (Analysis, FilePosition) {
     let mut mock = MockAnalysis::new();
-    let pos = mock.add_file_with_position("/main.rs", code);
+    let pos = mock.add_file_with_position("/main.rs", ra_fixture);
     (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) {
+pub fn single_file_with_range(ra_fixture: &str) -> (Analysis, FileRange) {
     let mut mock = MockAnalysis::new();
-    let pos = mock.add_file_with_range("/main.rs", code);
+    let pos = mock.add_file_with_range("/main.rs", ra_fixture);
     (mock.analysis(), pos)
 }
diff --git a/crates/ra_ide/src/syntax_highlighting.rs b/crates/ra_ide/src/syntax_highlighting.rs
index 796f0e545..3a5cbee9b 100644
--- a/crates/ra_ide/src/syntax_highlighting.rs
+++ b/crates/ra_ide/src/syntax_highlighting.rs
@@ -12,11 +12,12 @@ use ra_ide_db::{
 };
 use ra_prof::profile;
 use ra_syntax::{
-    ast, AstNode, Direction, NodeOrToken, SyntaxElement, SyntaxKind::*, TextRange, WalkEvent, T,
+    ast, AstNode, AstToken, Direction, NodeOrToken, SyntaxElement, SyntaxKind::*, SyntaxToken,
+    TextRange, WalkEvent, T,
 };
 use rustc_hash::FxHashMap;
 
-use crate::{references::classify_name_ref, FileId};
+use crate::{call_info::call_info_for_token, references::classify_name_ref, Analysis, FileId};
 
 pub(crate) use html::highlight_as_html;
 pub use tags::{Highlight, HighlightModifier, HighlightModifiers, HighlightTag};
@@ -94,11 +95,12 @@ pub(crate) fn highlight(
             WalkEvent::Enter(it) => it,
             WalkEvent::Leave(_) => continue,
         };
+
         let range = element.text_range();
 
         let element_to_highlight = if current_macro_call.is_some() {
             // Inside a macro -- expand it first
-            let token = match element.into_token() {
+            let token = match element.clone().into_token() {
                 Some(it) if it.parent().kind() == TOKEN_TREE => it,
                 _ => continue,
             };
@@ -110,9 +112,17 @@ pub(crate) fn highlight(
                 _ => token.into(),
             }
         } else {
-            element
+            element.clone()
         };
 
+        if let Some(token) = element.as_token().cloned().and_then(ast::RawString::cast) {
+            let expanded = element_to_highlight.as_token().unwrap().clone();
+            if highlight_injection(&mut res, &sema, token, expanded).is_some() {
+                eprintln!("res = {:?}", res);
+                continue;
+            }
+        }
+
         if let Some((highlight, binding_hash)) =
             highlight_element(&sema, &mut bindings_shadow_count, element_to_highlight)
         {
@@ -281,3 +291,44 @@ fn highlight_name_by_syntax(name: ast::Name) -> Highlight {
         _ => default,
     }
 }
+
+fn highlight_injection(
+    acc: &mut Vec<HighlightedRange>,
+    sema: &Semantics<RootDatabase>,
+    literal: ast::RawString,
+    expanded: SyntaxToken,
+) -> Option<()> {
+    let call_info = call_info_for_token(&sema, expanded)?;
+    let idx = call_info.active_parameter?;
+    let name = call_info.signature.parameter_names.get(idx)?;
+    if name != "ra_fixture" {
+        return None;
+    }
+    let value = literal.value()?;
+    let (analysis, tmp_file_id) = Analysis::from_single_file(value);
+
+    if let Some(range) = literal.open_quote_text_range() {
+        acc.push(HighlightedRange {
+            range,
+            highlight: HighlightTag::LiteralString.into(),
+            binding_hash: None,
+        })
+    }
+
+    for mut h in analysis.highlight(tmp_file_id).unwrap() {
+        if let Some(r) = literal.map_range_up(h.range) {
+            h.range = r;
+            acc.push(h)
+        }
+    }
+
+    if let Some(range) = literal.close_quote_text_range() {
+        acc.push(HighlightedRange {
+            range,
+            highlight: HighlightTag::LiteralString.into(),
+            binding_hash: None,
+        })
+    }
+
+    Some(())
+}
diff --git a/crates/ra_syntax/src/ast/tokens.rs b/crates/ra_syntax/src/ast/tokens.rs
index ed8661faf..693b35feb 100644
--- a/crates/ra_syntax/src/ast/tokens.rs
+++ b/crates/ra_syntax/src/ast/tokens.rs
@@ -171,6 +171,36 @@ impl RawString {
         let inside_str = &text[start_of_inside..end_of_inside];
         Some(inside_str.to_string())
     }
+
+    pub fn open_quote_text_range(&self) -> Option<TextRange> {
+        let text = self.text().as_str();
+        let usual_string_range = find_usual_string_range(text)?;
+
+        let start = self.syntax().text_range().start();
+        let len = usual_string_range.start() + TextUnit::of_char('"');
+        Some(TextRange::offset_len(start, len))
+    }
+
+    pub fn close_quote_text_range(&self) -> Option<TextRange> {
+        let text = self.text().as_str();
+        let usual_string_range = find_usual_string_range(text)?;
+
+        let end = self.syntax().text_range().end();
+        let len = TextUnit::of_str(text) - usual_string_range.end();
+        Some(TextRange::from_to(end - len, end))
+    }
+
+    pub fn map_range_up(&self, range: TextRange) -> Option<TextRange> {
+        // FIXME: handle escapes here properly
+        let text = self.text().as_str();
+        let usual_string_range = find_usual_string_range(text)?;
+        Some(
+            range
+                + self.syntax().text_range().start()
+                + TextUnit::of_char('"')
+                + usual_string_range.start(),
+        )
+    }
 }
 
 fn find_usual_string_range(s: &str) -> Option<TextRange> {