X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f16b08196c780556cbf50691e2944960aebc46f6..3f5d1b2c67651a9d620946de421f2e51600b885e:/src/location.c

diff --git a/src/location.c b/src/location.c
index 57adf188..6e5306c6 100644
--- a/src/location.c
+++ b/src/location.c
@@ -1,5 +1,6 @@
 /* Locations for Bison
-   Copyright (C) 2002, 2005, 2006, 2007 Free Software Foundation, Inc.
+
+   Copyright (C) 2002, 2005-2012 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -97,22 +98,127 @@ location_compute (location *loc, boundary *cur, char const *token, size_t size)
 
 /* Output to OUT the location LOC.
    Warning: it uses quotearg's slot 3.  */
-void
+unsigned
 location_print (FILE *out, location loc)
 {
-  int end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
-  fprintf (out, "%s:%d.%d",
-	   quotearg_n_style (3, escape_quoting_style, loc.start.file),
-	   loc.start.line, loc.start.column);
-
+  unsigned res = 0;
+  int end_col = 0 != loc.end.column ? loc.end.column - 1 : 0;
+  res += fprintf (out, "%s",
+                  quotearg_n_style (3, escape_quoting_style, loc.start.file));
+  if (0 <= loc.start.line)
+    {
+      res += fprintf (out, ":%d", loc.start.line);
+      if (0 <= loc.start.column)
+        res += fprintf (out, ".%d", loc.start.column);
+    }
   if (loc.start.file != loc.end.file)
-    fprintf (out, "-%s:%d.%d",
-	     quotearg_n_style (3, escape_quoting_style, loc.end.file),
-	     loc.end.line, end_col);
-  else if (loc.start.line < loc.end.line)
-    fprintf (out, "-%d.%d", loc.end.line, end_col);
-  else if (loc.start.column < end_col)
-    fprintf (out, "-%d", end_col);
+    {
+      res += fprintf (out, "-%s",
+                      quotearg_n_style (3, escape_quoting_style,
+                                        loc.end.file));
+      if (0 <= loc.end.line)
+        {
+          res += fprintf (out, ":%d", loc.end.line);
+          if (0 <= end_col)
+            res += fprintf (out, ".%d", end_col);
+        }
+    }
+  else if (0 <= loc.end.line)
+    {
+      if (loc.start.line < loc.end.line)
+        {
+          res += fprintf (out, "-%d", loc.end.line);
+          if (0 <= end_col)
+            res += fprintf (out, ".%d", end_col);
+        }
+      else if (0 <= end_col && loc.start.column < end_col)
+        res += fprintf (out, "-%d", end_col);
+    }
+
+  return res;
+}
+
+
+/* Persistant data used by location_caret to avoid reopening and rereading the
+   same file all over for each error.  */
+struct caret_info
+{
+  FILE* source;
+  size_t line;
+  size_t offset;
+};
+
+static struct caret_info caret_info = { NULL, 1, 0 };
+
+/* Free any allocated ressources and close any open file handles that are
+   left-over by the usage of location_caret.  */
+void
+cleanup_caret ()
+{
+  if (caret_info.source)
+    fclose (caret_info.source);
+}
+
+/* Output to OUT the line and caret corresponding to location LOC.  */
+void
+location_caret (FILE *out, location loc)
+{
+  /* FIXME: find a way to support X-file locations, and only open once each
+     file. That would make the procedure future-proof.  */
+  if (! (caret_info.source
+         || (caret_info.source = fopen (loc.start.file, "r")))
+      || loc.start.column == -1 || loc.start.line == -1)
+    return;
+
+  /* If the line we want to quote is seekable (the same line as the previous
+     location), just seek it. If it was before, we lost track of it, so
+     return to the start of file.  */
+  if (caret_info.line <= loc.start.line)
+    fseek (caret_info.source, caret_info.offset, SEEK_SET);
+  else
+    {
+      caret_info.line = 1;
+      caret_info.offset = 0;
+      fseek (caret_info.source, caret_info.offset, SEEK_SET);
+    }
+
+  /* Advance to the line's position, keeping track of the offset.  */
+  {
+    int i;
+    for (i = caret_info.line; i < loc.start.line; caret_info.offset++)
+      if (fgetc (caret_info.source) == '\n')
+        ++i;
+  }
+  caret_info.line = loc.start.line;
+
+  /* Read the actual line.  Don't update the offset, so that we keep a pointer
+     to the start of the line.  */
+  {
+    ssize_t len = 0;
+    char *buf = NULL;
+    if ((len = getline (&buf, (size_t*) &len, caret_info.source)) != -1)
+      {
+        /* The caret of a multiline location ends with the first line.  */
+        int end = loc.start.line != loc.end.line ? len : loc.end.column;
+
+        if (len)
+          {
+            int i = loc.start.column;
+            /* Quote the file, indent by a single column.  */
+            fputc (' ', out);
+            fwrite (buf, 1, len, out);
+
+            /* Print the caret, with the same indent as above.  */
+            fputc (' ', out);
+            fprintf (out, "%*s", loc.start.column - 1, "");
+            do {
+              fputc ('^', out);
+            } while (++i < end);
+          }
+        fputc ('\n', out);
+        free (buf);
+      }
+  }
 }
 
 void
@@ -120,11 +226,11 @@ boundary_set_from_string (boundary *bound, char *loc_str)
 {
   /* Must search in reverse since the file name field may
    * contain `.' or `:'.  */
-  char *delim = strrchr (loc_str, '.');
+  char *delim = mbsrchr (loc_str, '.');
   aver (delim);
   *delim = '\0';
   bound->column = atoi (delim+1);
-  delim = strrchr (loc_str, ':');
+  delim = mbsrchr (loc_str, ':');
   aver (delim);
   *delim = '\0';
   bound->line = atoi (delim+1);