Split string lexing and run rustfmt

1 files changed, 46 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/string_lexing/string.rs b/crates/ra_syntax/src/string_lexing/string.rs
new file mode 100644
index 000000000..1b23029c6
--- /dev/null
+++ b/crates/ra_syntax/src/string_lexing/string.rs
@@ -0,0 +1,46 @@
+use super::parser::Parser;
+use super::StringComponent;
+
+pub fn parse_string_literal(src: &str) -> StringComponentIterator {
+    StringComponentIterator {
+        parser: Parser::new(src),
+        has_closing_quote: false,
+    }
+}
+
+pub struct StringComponentIterator<'a> {
+    parser: Parser<'a>,
+    pub has_closing_quote: bool,
+}
+
+impl<'a> Iterator for StringComponentIterator<'a> {
+    type Item = StringComponent;
+    fn next(&mut self) -> Option<StringComponent> {
+        if self.parser.pos == 0 {
+            assert!(
+                self.parser.advance() == '"',
+                "string literal should start with double quotes"
+            );
+        }
+
+        if let Some(component) = self.parser.parse_string_component() {
+            return Some(component);
+        }
+
+        // We get here when there are no char components left to parse
+        if self.parser.peek() == Some('"') {
+            self.parser.advance();
+            self.has_closing_quote = true;
+        }
+
+        assert!(
+            self.parser.peek() == None,
+            "string literal should leave no unparsed input: src = {}, pos = {}, length = {}",
+            self.parser.src,
+            self.parser.pos,
+            self.parser.src.len()
+        );
+
+        None
+    }
+}