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09/10: import: hackage: Parse braced properties.


From: guix-commits
Subject: 09/10: import: hackage: Parse braced properties.
Date: Sun, 2 Jun 2019 16:21:27 -0400 (EDT)

civodul pushed a commit to branch master
in repository guix.

commit 959c9d159da2c53b87ae0af1421aecac98b20f46
Author: Robert Vollmert <address@hidden>
Date:   Sun Jun 2 00:27:50 2019 +0200

    import: hackage: Parse braced properties.
    
    This adds partial support for Cabal properties that use curly
    braces instead of the layout rule.  See for example
    https://hackage.haskell.org/package/cassava/
    
    * guix/import/cabal.scm (read-braced-value): New procedure.
    (is-property): Remove.
    (is-layout-property, is-braced-property): New variables.
    (lex-property): Rename to...
    (lex-layout-property): ... this.
    (lex-braced-property, lex-property): New procedures.
    (lex-token): Add call to 'lex-property'.
    * guix/tests/hackage.scm: Test braced description import.
    * tests/hackage.scm (test-cabal-multiline-desc): Rename to...
    (test-cabal-multiline-layout): ... this.
    ("hackage->guix-package test multiline desc"): Rename to...
    ("hackage->guix-package test multiline desc (layout)"): ... this.
    (test-cabal-multiline-braced): New variable.
    ("hackage->guix-package test multiline desc (braced)"): New test.
    
    Signed-off-by: Ludovic Court├Ęs <address@hidden>
---
 guix/import/cabal.scm | 35 ++++++++++++++++++++++++++++-------
 tests/hackage.scm     | 25 ++++++++++++++++++++++---
 2 files changed, 50 insertions(+), 10 deletions(-)

diff --git a/guix/import/cabal.scm b/guix/import/cabal.scm
index 13c2f3f..1a87be0 100644
--- a/guix/import/cabal.scm
+++ b/guix/import/cabal.scm
@@ -270,6 +270,10 @@ following lines with indentation larger than MIN-INDENT."
                 (peek-next-line-indent port)))
         val)))
 
+(define* (read-braced-value port)
+  "Read up to a closing brace."
+  (string-trim-both (read-delimited "}" port 'trim)))
+
 (define (lex-white-space port bol)
   "Consume white spaces and comment lines on PORT.  If a new line is started 
return #t,
 otherwise return BOL (beginning-of-line)."
@@ -343,8 +347,11 @@ matching a string against the created regexp."
                 (make-regexp pat))))
     (cut regexp-exec rx <>)))
 
-(define is-property (make-rx-matcher "([a-z0-9-]+)[ \t]*:[ \t]*(\\w?.*)$"
-                                     regexp/icase))
+(define is-layout-property (make-rx-matcher "([a-z0-9-]+)[ \t]*:[ 
\t]*(\\w?[^{}]*)$"
+                                            regexp/icase))
+
+(define is-braced-property (make-rx-matcher "([a-z0-9-]+)[ \t]*:[ \t]*\\{[ 
\t]*$"
+                                            regexp/icase))
 
 (define is-flag (make-rx-matcher "^flag +([a-z0-9_-]+)"
                                  regexp/icase))
@@ -435,13 +442,19 @@ string with the read characters."
                  (begin (unread-char c) (list->string res)))))
           (else (list->string res)))))
 
-(define (lex-property k-v-rx-res loc port)
+(define (lex-layout-property k-v-rx-res loc port)
   (let ((key (string-downcase (match:substring k-v-rx-res 1)))
         (value (match:substring k-v-rx-res 2)))
     (make-lexical-token
      'PROPERTY loc
      (list key `(,(read-value port value (current-indentation)))))))
 
+(define (lex-braced-property k-rx-res loc port)
+  (let ((key (string-downcase (match:substring k-rx-res 1))))
+    (make-lexical-token
+     'PROPERTY loc
+     (list key `(,(read-braced-value port))))))
+
 (define (lex-rx-res rx-res token loc)
   (let ((name (string-downcase (match:substring rx-res 1))))
     (make-lexical-token token loc name)))
@@ -552,7 +565,6 @@ LOC is the current port location."
 the current port location."
   (let* ((s (read-delimited "\n{}" port 'peek)))
     (cond
-     ((is-property s) => (cut lex-property <> loc port))
      ((is-flag s) => (cut lex-flag <> loc))
      ((is-src-repo s) => (cut lex-src-repo <> loc))
      ((is-exec s) => (cut lex-exec <> loc))
@@ -561,13 +573,22 @@ the current port location."
      ((is-benchmark s) => (cut lex-benchmark <> loc))
      ((is-lib s) (lex-lib loc))
      ((is-else s) (lex-else loc))
-     (else
-      #f))))
+     (else (unread-string s port) #f))))
+
+(define (lex-property port loc)
+  (let* ((s (read-delimited "\n" port 'peek)))
+    (cond
+      ((is-braced-property s) => (cut lex-braced-property <> loc port))
+      ((is-layout-property s) => (cut lex-layout-property <> loc port))
+      (else #f))))
 
 (define (lex-token port)
   (let* ((loc (make-source-location (cabal-file-name) (port-line port)
                                     (port-column port) -1 -1)))
-    (or (lex-single-char port loc) (lex-word port loc) (lex-line port loc))))
+    (or (lex-single-char port loc)
+        (lex-word port loc)
+        (lex-line port loc)
+        (lex-property port loc))))
 
 ;; Lexer- and error-function generators
 
diff --git a/tests/hackage.scm b/tests/hackage.scm
index 2f45194..38a5825 100644
--- a/tests/hackage.scm
+++ b/tests/hackage.scm
@@ -237,7 +237,7 @@ library
   (eval-test-with-cabal test-cabal-6 match-ghc-foo-6))
 
 ;; Check multi-line layouted description
-(define test-cabal-multiline-desc
+(define test-cabal-multiline-layout
   "name: foo
 version: 1.0.0
 homepage: http://test.org
@@ -251,9 +251,28 @@ executable cabal
     mtl        >= 2.0      && < 3
 ")
 
-(test-assert "hackage->guix-package test multiline desc"
-  (eval-test-with-cabal test-cabal-multiline-desc match-ghc-foo))
+(test-assert "hackage->guix-package test multiline desc (layout)"
+  (eval-test-with-cabal test-cabal-multiline-layout match-ghc-foo))
 
+;; Check multi-line braced description
+(define test-cabal-multiline-braced
+  "name: foo
+version: 1.0.0
+homepage: http://test.org
+synopsis: synopsis
+description: {
+first line
+second line
+}
+license: BSD3
+executable cabal
+  build-depends:
+    HTTP       >= 4000.2.5 && < 4000.3,
+    mtl        >= 2.0      && < 3
+")
+
+(test-assert "hackage->guix-package test multiline desc (braced)"
+  (eval-test-with-cabal test-cabal-multiline-braced match-ghc-foo))
 
 (test-assert "read-cabal test 1"
   (match (call-with-input-string test-read-cabal-1 read-cabal)



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