strongly-typed passes

src/librustdoc/lib.rs

@@ -26,6 +26,7 @@
 #![feature(entry_and_modify)]
 #![feature(ptr_offset_from)]
 #![feature(crate_visibility_modifier)]
+#![feature(const_fn)]
 
 #![recursion_limit="256"]
 
@@ -367,8 +368,8 @@ fn main_args(args: &[String]) -> isize {
 
     if matches.opt_strs("passes") == ["list"] {
         println!("Available passes for running rustdoc:");
-        for &(name, _, description) in passes::PASSES {
-            println!("{:>20} - {}", name, description);
+        for pass in passes::PASSES {
+            println!("{:>20} - {}", pass.name(), pass.description());
         }
         println!("\nDefault passes for rustdoc:");
         for &name in passes::DEFAULT_PASSES {
@@ -751,8 +752,13 @@ where R: 'static + Send,
 
         for pass in &passes {
             // determine if we know about this pass
-            let pass = match passes::PASSES.iter().find(|(p, ..)| p == pass) {
-                Some(pass) => pass.1,
+            let pass = match passes::PASSES.iter().find(|p| p.name() == pass) {
+                Some(pass) => if let Some(pass) = pass.late_fn() {
+                    pass
+                } else {
+                    // not a late pass, but still valid so don't report the error
+                    continue
+                }
                 None => {
                     error!("unknown pass {}, skipping", *pass);
 

src/librustdoc/passes/collapse_docs.rs

@@ -11,8 +11,13 @@
 use clean::{self, DocFragment, Item};
 use fold;
 use fold::DocFolder;
+use passes::Pass;
 use std::mem::replace;
 
+pub const COLLAPSE_DOCS: Pass =
+    Pass::late("collapse-docs", collapse_docs,
+        "concatenates all document attributes into one document attribute");
+
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 enum DocFragmentKind {
     Sugared,

src/librustdoc/passes/mod.rs

@@ -18,61 +18,65 @@ use fold;
 use fold::StripItem;
 
 mod collapse_docs;
-pub use self::collapse_docs::collapse_docs;
+pub use self::collapse_docs::COLLAPSE_DOCS;
 
 mod strip_hidden;
-pub use self::strip_hidden::strip_hidden;
+pub use self::strip_hidden::STRIP_HIDDEN;
 
 mod strip_private;
-pub use self::strip_private::strip_private;
+pub use self::strip_private::STRIP_PRIVATE;
 
 mod strip_priv_imports;
-pub use self::strip_priv_imports::strip_priv_imports;
+pub use self::strip_priv_imports::STRIP_PRIV_IMPORTS;
 
 mod unindent_comments;
-pub use self::unindent_comments::unindent_comments;
+pub use self::unindent_comments::UNINDENT_COMMENTS;
 
 mod propagate_doc_cfg;
-pub use self::propagate_doc_cfg::propagate_doc_cfg;
+pub use self::propagate_doc_cfg::PROPAGATE_DOC_CFG;
 
-type Pass = (
-    &'static str,                     // name
-    fn(clean::Crate) -> clean::Crate, // fn
-    &'static str,
-); // description
+#[derive(Copy, Clone, Debug)]
+pub enum Pass {
+    LatePass {
+        name: &'static str,
+        pass: fn(clean::Crate) -> clean::Crate,
+        description: &'static str,
+    }
+}
+
+impl Pass {
+    pub const fn late(name: &'static str,
+                      pass: fn(clean::Crate) -> clean::Crate,
+                      description: &'static str) -> Pass {
+        Pass::LatePass { name, pass, description }
+    }
+
+    pub fn name(self) -> &'static str {
+        match self {
+            Pass::LatePass { name, .. } => name,
+        }
+    }
+
+    pub fn description(self) -> &'static str {
+        match self {
+            Pass::LatePass { description, .. } => description,
+        }
+    }
+
+    pub fn late_fn(self) -> Option<fn(clean::Crate) -> clean::Crate> {
+        match self {
+            Pass::LatePass { pass, .. } => Some(pass),
+        }
+    }
+}
 
 pub const PASSES: &'static [Pass] = &[
-    (
-        "strip-hidden",
-        strip_hidden,
-        "strips all doc(hidden) items from the output",
-    ),
-    (
-        "unindent-comments",
-        unindent_comments,
-        "removes excess indentation on comments in order for markdown to like it",
-    ),
-    (
-        "collapse-docs",
-        collapse_docs,
-        "concatenates all document attributes into one document attribute",
-    ),
-    (
-        "strip-private",
-        strip_private,
-        "strips all private items from a crate which cannot be seen externally, \
-         implies strip-priv-imports",
-    ),
-    (
-        "strip-priv-imports",
-        strip_priv_imports,
-        "strips all private import statements (`use`, `extern crate`) from a crate",
-    ),
-    (
-        "propagate-doc-cfg",
-        propagate_doc_cfg,
-        "propagates `#[doc(cfg(...))]` to child items",
-    ),
+    STRIP_HIDDEN,
+    UNINDENT_COMMENTS,
+    COLLAPSE_DOCS,
+    STRIP_PRIVATE,
+    STRIP_PRIV_IMPORTS,
+    PROPAGATE_DOC_CFG,
 ];
 
 pub const DEFAULT_PASSES: &'static [&'static str] = &[

src/librustdoc/passes/propagate_doc_cfg.rs

@@ -13,6 +13,11 @@ use std::sync::Arc;
 use clean::{Crate, Item};
 use clean::cfg::Cfg;
 use fold::DocFolder;
+use passes::Pass;
+
+pub const PROPAGATE_DOC_CFG: Pass =
+    Pass::late("propagate-doc-cfg", propagate_doc_cfg,
+        "propagates `#[doc(cfg(...))]` to child items");
 
 pub fn propagate_doc_cfg(cr: Crate) -> Crate {
     CfgPropagator { parent_cfg: None }.fold_crate(cr)

src/librustdoc/passes/strip_hidden.rs

@@ -16,7 +16,11 @@ use clean::Item;
 use fold;
 use fold::DocFolder;
 use fold::StripItem;
-use passes::ImplStripper;
+use passes::{ImplStripper, Pass};
+
+pub const STRIP_HIDDEN: Pass =
+    Pass::late("strip-hidden", strip_hidden,
+               "strips all doc(hidden) items from the output");
 
 /// Strip items marked `#[doc(hidden)]`
 pub fn strip_hidden(krate: clean::Crate) -> clean::Crate {

src/librustdoc/passes/strip_priv_imports.rs

@@ -10,7 +10,10 @@
 
 use clean;
 use fold::DocFolder;
-use passes::ImportStripper;
+use passes::{ImportStripper, Pass};
+
+pub const STRIP_PRIV_IMPORTS: Pass = Pass::late("strip-priv-imports", strip_priv_imports,
+     "strips all private import statements (`use`, `extern crate`) from a crate");
 
 pub fn strip_priv_imports(krate: clean::Crate)  -> clean::Crate {
     ImportStripper.fold_crate(krate)

src/librustdoc/passes/strip_private.rs

@@ -12,7 +12,12 @@ use rustc::util::nodemap::DefIdSet;
 
 use clean;
 use fold::DocFolder;
-use passes::{ImplStripper, ImportStripper, Stripper};
+use passes::{ImplStripper, ImportStripper, Stripper, Pass};
+
+pub const STRIP_PRIVATE: Pass =
+    Pass::late("strip-private", strip_private,
+        "strips all private items from a crate which cannot be seen externally, \
+         implies strip-priv-imports");
 
 /// Strip private items from the point of view of a crate or externally from a
 /// crate, specified by the `xcrate` flag.

src/librustdoc/passes/unindent_comments.rs

@@ -14,6 +14,11 @@ use std::usize;
 
 use clean::{self, DocFragment, Item};
 use fold::{self, DocFolder};
+use passes::Pass;
+
+pub const UNINDENT_COMMENTS: Pass =
+    Pass::late("unindent-comments", unindent_comments,
+        "removes excess indentation on comments in order for markdown to like it");
 
 pub fn unindent_comments(krate: clean::Crate) -> clean::Crate {
     CommentCleaner.fold_crate(krate)