Let parser eval string directly

This gets the reader out of asting the source and is needed for
autoloader to get it to read a source string directly

Also add an "eval_file_wstr" method as a convenience to run a wstr as if it is a *file*, with a block and stuff

src/parser.rs

@@ -565,6 +565,52 @@ pub fn eval_parsed_source(
         }
     }
 
+    pub fn eval_wstr(
+        &self,
+        src: WString,
+        io: &IoChain,
+        job_group: Option<&JobGroupRef>,
+        block_type: BlockType,
+    ) -> Result<EvalRes, WString> {
+        use crate::parse_tree::ParsedSource;
+        use crate::parse_util::parse_util_detect_errors_in_ast;
+        let mut errors = vec![];
+        let ast = Ast::parse(&src, ParseTreeFlags::empty(), Some(&mut errors));
+        let mut errored = ast.errored();
+        if !errored {
+            errored = parse_util_detect_errors_in_ast(&ast, &src, Some(&mut errors)).is_err();
+        }
+        if errored {
+            let sb = self.get_backtrace(&src, &errors);
+            return Err(sb);
+        }
+
+        // Construct a parsed source ref.
+        // Be careful to transfer ownership, this could be a very large string.
+        let ps = Arc::new(ParsedSource::new(src, ast));
+        Ok(self.eval_parsed_source(&ps, io, job_group, block_type))
+    }
+
+    pub fn eval_file_wstr(
+        &self,
+        src: WString,
+        filename: Arc<WString>,
+        io: &IoChain,
+        job_group: Option<&JobGroupRef>,
+    ) -> Result<EvalRes, WString> {
+        let _interactive_push = self.push_scope(|s| s.is_interactive = false);
+        let sb = self.push_block(Block::source_block(filename.clone()));
+        let _filename_push = self
+            .library_data
+            .scoped_set(Some(filename.clone()), |s| &mut s.current_filename);
+
+        let ret = self.eval_wstr(src, io, job_group, BlockType::top);
+
+        self.pop_block(sb);
+        self.libdata_mut().exit_current_script = false;
+        ret
+    }
+
     /// Evaluates a node.
     /// The node type must be ast::Statement or ast::JobList.
     pub fn eval_node<T: Node>(

src/reader.rs

@@ -101,16 +101,14 @@
 use crate::panic::AT_EXIT;
 use crate::parse_constants::SourceRange;
 use crate::parse_constants::{ParseTreeFlags, ParserTestErrorBits};
-use crate::parse_tree::ParsedSource;
 use crate::parse_util::parse_util_process_extent;
 use crate::parse_util::MaybeParentheses;
 use crate::parse_util::SPACES_PER_INDENT;
 use crate::parse_util::{
     parse_util_cmdsubst_extent, parse_util_compute_indents, parse_util_contains_wildcards,
-    parse_util_detect_errors, parse_util_detect_errors_in_ast, parse_util_escape_string_with_quote,
-    parse_util_escape_wildcards, parse_util_get_line_from_offset, parse_util_get_offset,
-    parse_util_get_offset_from_line, parse_util_lineno, parse_util_locate_cmdsubst_range,
-    parse_util_token_extent,
+    parse_util_detect_errors, parse_util_escape_string_with_quote, parse_util_escape_wildcards,
+    parse_util_get_line_from_offset, parse_util_get_offset, parse_util_get_offset_from_line,
+    parse_util_lineno, parse_util_locate_cmdsubst_range, parse_util_token_extent,
 };
 use crate::parser::{BlockType, EvalRes, Parser};
 use crate::proc::{
@@ -818,25 +816,13 @@ fn read_ni(parser: &Parser, fd: RawFd, io: &IoChain) -> Result<(), ErrorCode> {
         s.remove(0);
     }
 
-    // Parse into an ast and detect errors.
-    let mut errors = vec![];
-    let ast = Ast::parse(&s, ParseTreeFlags::empty(), Some(&mut errors));
-    let mut errored = ast.errored();
-    if !errored {
-        errored = parse_util_detect_errors_in_ast(&ast, &s, Some(&mut errors)).is_err();
+    match parser.eval_wstr(s, io, None, BlockType::top) {
+        Ok(_) => Ok(()),
+        Err(msg) => {
+            eprintf!("%ls", msg);
+            Err(STATUS_CMD_ERROR)
+        }
     }
-    if errored {
-        let sb = parser.get_backtrace(&s, &errors);
-        eprintf!("%ls", sb);
-        return Err(STATUS_CMD_ERROR);
-    }
-
-    // Construct a parsed source ref.
-    // Be careful to transfer ownership, this could be a very large string.
-    let ps = Arc::new(ParsedSource::new(s, ast));
-    parser.eval_parsed_source(&ps, io, None, BlockType::top);
-
-    Ok(())
 }
 
 /// Initialize the reader.