[gtk+/wip/otte/shader: 142/269] gskslpreprocessor: Return fatalness of parsing

[Benjamin Otte <otte src gnome org>]

commit 71f92fea81c303646c17d5bfecf93b94e091ed50
Author: Benjamin Otte <otte redhat com>
Date:   Wed Sep 27 17:18:53 2017 +0200

    gskslpreprocessor: Return fatalness of parsing
    
    Instead of relying on parsing functions to return FALSE on error, we
    record that parsing failed inside the preprocessor object and continue
    parsing (potentially using dummy objects as the result).
    
    That way, we keep parsing and can emit potentially useful error messages
    for the rest of the document.
    
    Now we just need to implement that mentality.

 gsk/gskslcompiler.c            |    4 +++-
 gsk/gskslpreprocessor.c        |    9 +++++++++
 gsk/gskslpreprocessorprivate.h |    1 +
 gsk/gskslprogram.c             |   17 +++++++----------
 gsk/gskslprogramprivate.h      |    2 +-
 5 files changed, 21 insertions(+), 12 deletions(-)
---
diff --git a/gsk/gskslcompiler.c b/gsk/gskslcompiler.c
index 1e9cfea..b473cec 100644
--- a/gsk/gskslcompiler.c
+++ b/gsk/gskslcompiler.c
@@ -196,7 +196,9 @@ gsk_sl_compiler_compile (GskSlCompiler *compiler,
 
   preproc = gsk_sl_preprocessor_new (compiler, source);
 
-  if (!gsk_sl_program_parse (program, preproc))
+  gsk_sl_program_parse (program, preproc);
+
+  if (gsk_sl_preprocessor_has_fatal_error (preproc))
     {
       g_object_unref (program);
       program = NULL;
diff --git a/gsk/gskslpreprocessor.c b/gsk/gskslpreprocessor.c
index 98c2fd5..ca39e79 100644
--- a/gsk/gskslpreprocessor.c
+++ b/gsk/gskslpreprocessor.c
@@ -39,6 +39,7 @@ struct _GskSlPreprocessor
   GskSlTokenizer *tokenizer;
   GArray *tokens;
   GHashTable *defines;
+  gboolean fatal_error;
 };
 
 /* API */
@@ -111,6 +112,12 @@ gsk_sl_preprocessor_unref (GskSlPreprocessor *preproc)
   g_slice_free (GskSlPreprocessor, preproc);
 }
 
+gboolean
+gsk_sl_preprocessor_has_fatal_error (GskSlPreprocessor *preproc)
+{
+  return preproc->fatal_error;
+}
+
 static gboolean
 gsk_sl_preprocessor_next_token (GskSlPreprocessor *preproc,
                                 GskSlPpToken      *pp,
@@ -375,6 +382,8 @@ gsk_sl_preprocessor_emit_error (GskSlPreprocessor     *preproc,
                                 const GskCodeLocation *location,
                                 const GError          *error)
 {
+  preproc->fatal_error |= fatal;
+
   g_printerr ("%3zu:%2zu: %s: %s\n",
               location->lines + 1, location->line_bytes,
               fatal ? "error" : "warn",
diff --git a/gsk/gskslpreprocessorprivate.h b/gsk/gskslpreprocessorprivate.h
index 8fcb429..b6544cc 100644
--- a/gsk/gskslpreprocessorprivate.h
+++ b/gsk/gskslpreprocessorprivate.h
@@ -31,6 +31,7 @@ GskSlPreprocessor *     gsk_sl_preprocessor_new                 (GskSlCompiler
 GskSlPreprocessor *     gsk_sl_preprocessor_ref                 (GskSlPreprocessor   *preproc);
 void                    gsk_sl_preprocessor_unref               (GskSlPreprocessor   *preproc);
 
+gboolean                gsk_sl_preprocessor_has_fatal_error     (GskSlPreprocessor   *preproc);
 const GskSlToken *      gsk_sl_preprocessor_get                 (GskSlPreprocessor   *preproc);
 const GskCodeLocation * gsk_sl_preprocessor_get_location        (GskSlPreprocessor   *preproc);
 void                    gsk_sl_preprocessor_consume             (GskSlPreprocessor   *preproc,
diff --git a/gsk/gskslprogram.c b/gsk/gskslprogram.c
index 8f9c3ed..d1dea50 100644
--- a/gsk/gskslprogram.c
+++ b/gsk/gskslprogram.c
@@ -136,7 +136,7 @@ gsk_sl_program_parse_variable (GskSlProgram      *program,
   return TRUE;
 }
 
-static gboolean
+static void
 gsk_sl_program_parse_declaration (GskSlProgram      *program,
                                   GskSlScope        *scope,
                                   GskSlPreprocessor *preproc)
@@ -155,7 +155,7 @@ gsk_sl_program_parse_declaration (GskSlProgram      *program,
   if (type == NULL)
     {
       gsk_sl_preprocessor_consume (preproc, program);
-      return FALSE;
+      return;
     }
 
   token = gsk_sl_preprocessor_get (preproc);
@@ -170,13 +170,13 @@ gsk_sl_program_parse_declaration (GskSlProgram      *program,
           gsk_sl_preprocessor_consume (preproc, program);
         }
       gsk_sl_type_unref (type);
-      return success;
+      return;
     }
   else if (!gsk_sl_token_is (token, GSK_SL_TOKEN_IDENTIFIER))
     {
       gsk_sl_preprocessor_error (preproc, SYNTAX, "Expected a variable name");
       gsk_sl_type_unref (type);
-      return FALSE;
+      return;
     }
 
   name = g_strdup (token->str);
@@ -204,24 +204,21 @@ gsk_sl_program_parse_declaration (GskSlProgram      *program,
 
   g_free (name);
 
-  return success;
+  return;
 }
 
-gboolean
+void
 gsk_sl_program_parse (GskSlProgram      *program,
                       GskSlPreprocessor *preproc)
 {
   const GskSlToken *token;
-  gboolean success = TRUE;
 
   for (token = gsk_sl_preprocessor_get (preproc);
        !gsk_sl_token_is (token, GSK_SL_TOKEN_EOF);
        token = gsk_sl_preprocessor_get (preproc))
     {
-      success &= gsk_sl_program_parse_declaration (program, program->scope, preproc);
+      gsk_sl_program_parse_declaration (program, program->scope, preproc);
     }
-
-  return success;
 }
 
 void
diff --git a/gsk/gskslprogramprivate.h b/gsk/gskslprogramprivate.h
index 9b24b8e..4d9ec97 100644
--- a/gsk/gskslprogramprivate.h
+++ b/gsk/gskslprogramprivate.h
@@ -24,7 +24,7 @@
 
 G_BEGIN_DECLS
 
-gboolean                gsk_sl_program_parse                    (GskSlProgram           *program,
+void                    gsk_sl_program_parse                    (GskSlProgram           *program,
                                                                  GskSlPreprocessor      *preproc);
 
 G_END_DECLS