Rearrange lexical scoping (fixes #202)

pollen/private/dialect.rkt

@@ -3,10 +3,12 @@
 (provide (except-out (all-from-out racket/base pollen/setup) #%module-begin)
          (rename-out [mb #%module-begin]) #%top-interaction)
 
-(define-syntax-rule (mb mode . args)
+(define-syntax-rule (mb MODE . ARGS)
   (#%module-begin
-   (require (prefix-in p: "private/main-base.rkt"))
+   (require (except-in "private/main-base.rkt" #%module-begin)
-   (provide (rename-out [mb #%module-begin]))
+            (prefix-in p: (only-in "private/main-base.rkt" #%module-begin)))
-   (define-syntax-rule (mb . other-args)
+   (provide (all-from-out "private/main-base.rkt")
-     (p:#%module-begin mode . other-args))
+            (rename-out [mb #%module-begin]))
-   . args))
+   (define-syntax-rule (mb . OTHER-ARGS)
+     (p:#%module-begin MODE . OTHER-ARGS))
+   . ARGS))

pollen/private/main-base.rkt

@@ -8,11 +8,12 @@
          "to-string.rkt"
          "../pagetree.rkt"
          "splice.rkt"
-         "../setup.rkt"
          "../core.rkt"
+         "../setup.rkt"
          (prefix-in doclang: "external/doclang-raw.rkt"))
 (provide (except-out (all-from-out racket/base) #%module-begin)
-         (rename-out [pollen-module-begin #%module-begin]))
+         (rename-out [pollen-module-begin #%module-begin])
+         (all-from-out "../core.rkt" "../setup.rkt"))
 
 (define ((make-parse-proc parser-mode root-proc) xs)
   (define (stringify xs) (apply string-append (map to-string xs)))
@@ -35,11 +36,13 @@
 (define-syntax (pollen-module-begin stx)
   (syntax-case stx ()
     [(_ PARSER-MODE . EXPRS)
-     (with-syntax ([EXPRS (replace-context #'here #'EXPRS)]
+     (with-syntax ([META-HASH (split-metas #'EXPRS (setup:define-meta-name))]
-                   [META-HASH (split-metas #'EXPRS (setup:define-meta-name))]
+                   [METAS-ID-HERE (setup:meta-export)]
-                   [METAS-ID (setup:meta-export)]
+                   [METAS-ID (datum->syntax #'EXPRS (setup:meta-export))]
                    [META-MOD-ID (setup:meta-export)]
-                   [ROOT-ID (setup:main-root-node)]
+                   [ROOT-ID (datum->syntax #'EXPRS (setup:main-root-node))]
+                   [CURRENT-METAS (datum->syntax #'EXPRS 'current-metas)]
+                   [POLLEN/TOP (datum->syntax #'EXPRS 'pollen/top)]
                    [DOC-ID (setup:main-export)])
        #'(doclang:#%module-begin
           DOC-ID ; positional arg for doclang-raw: name of export
@@ -47,14 +50,15 @@
             (define proc (make-parse-proc PARSER-MODE ROOT-ID))
             (define trimmed-xs (strip-leading-newlines xs))
             (define doc-elements (splice trimmed-xs (setup:splicing-tag)))
-            (parameterize ([current-metas METAS-ID])
+            (parameterize ([CURRENT-METAS METAS-ID])
               (proc doc-elements))) ;  positional arg for doclang-raw: post-processor
           (module META-MOD-ID racket/base
             (provide METAS-ID)
             (define METAS-ID META-HASH))
-          (require pollen/top pollen/core pollen/setup (submod "." META-MOD-ID))
+          (require POLLEN/TOP (submod "." META-MOD-ID))
           (provide (all-defined-out) METAS-ID DOC-ID)
-          (define prev-metas (current-metas))
+          (define prev-metas (CURRENT-METAS))
-          (and (current-metas METAS-ID) "") ; because empty strings get stripped, voids don't
+          (define METAS-ID METAS-ID-HERE)
+          (and (CURRENT-METAS METAS-ID) "") ; because empty strings get stripped, voids don't
           (begin . EXPRS)
-          (and (current-metas prev-metas) "")))])) ; leave behind empty string, not void
+          (and (CURRENT-METAS prev-metas) "")))])) ; leave behind empty string, not void