docs

[pspp] / src / data / spreadsheet-reader.c

diff --git a/src/data/spreadsheet-reader.c b/src/data/spreadsheet-reader.c
index 11e8cf593ac44476664aab6ac2d8fef688121cf0..a16b430a52367fd9a670516f04b8eb0e4457e9e0 100644 (file)
--- a/src/data/spreadsheet-reader.c
+++ b/src/data/spreadsheet-reader.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 2007, 2009, 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009, 2010, 2011, 2013, 2020 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -18,9 +18,91 @@
 
 #include "spreadsheet-reader.h"
 
+#include <libpspp/assertion.h>
+#include "gnumeric-reader.h"
+#include "ods-reader.h"
+
 #include <libpspp/str.h>
 #include <stdio.h>
 #include <string.h>
+#include <gl/xalloc.h>
+#include <gl/c-xvasprintf.h>
+#include <stdlib.h>
+
+struct spreadsheet *
+spreadsheet_ref (struct spreadsheet *s)
+{
+  s->ref_cnt++;
+  return s;
+}
+
+void
+spreadsheet_unref (struct spreadsheet *s)
+{
+  if (--s->ref_cnt == 0)
+    s->destroy (s);
+}
+
+
+struct casereader *
+spreadsheet_make_reader (struct spreadsheet *s,
+                         const struct spreadsheet_read_options *opts)
+{
+  return s->make_reader (s, opts);
+}
+
+const char *
+spreadsheet_get_sheet_name (struct spreadsheet *s, int n)
+{
+  return s->get_sheet_name (s, n);
+}
+
+
+char *
+spreadsheet_get_sheet_range (struct spreadsheet *s, int n)
+{
+  return s->get_sheet_range (s, n);
+}
+
+int
+spreadsheet_get_sheet_n_sheets (struct spreadsheet *s)
+{
+  return s->get_sheet_n_sheets (s);
+}
+
+unsigned int
+spreadsheet_get_sheet_n_rows (struct spreadsheet *s, int n)
+{
+  return s->get_sheet_n_rows (s, n);
+}
+
+unsigned int
+spreadsheet_get_sheet_n_columns (struct spreadsheet *s, int n)
+{
+  return s->get_sheet_n_columns (s, n);
+}
+
+char *
+spreadsheet_get_cell (struct spreadsheet *s, int n, int row, int column)
+{
+  return s->get_sheet_cell (s, n, row, column);
+}
+
+
+#define RADIX 26
+
+static void
+reverse (char *s, int len)
+{
+  int i;
+  for (i = 0; i < len / 2; ++i)
+    {
+      char tmp = s[len - i - 1];
+      s[len - i -1] = s[i];
+      s[i] = tmp;
+    }
+}
+
 
 /* Convert a string, which is an integer encoded in base26
    IE, A=0, B=1, ... Z=25 to the integer it represents.
@@ -28,33 +110,110 @@
    greater than 1 are implicitly incremented by 1, so
    AA  = 0 + 1*26, AB = 1 + 1*26,
    ABC = 2 + 2*26 + 1*26^2 ....
+   On error, this function returns -1
 */
 int
-pseudo_base26 (const char *str)
+ps26_to_int (const char *str)
 {
   int i;
   int multiplier = 1;
   int result = 0;
   int len = strlen (str);
 
-  for ( i = len - 1 ; i >= 0; --i)
+  for (i = len - 1 ; i >= 0; --i)
     {
-      int mantissa = (str[i] - 'A');
-
-      if ( mantissa < 0 || mantissa > 25 )
+      char c = str[i];
+      if (c < 'A' || c > 'Z')
        return -1;
+      int mantissa = (c - 'A');
+
+      assert (mantissa >= 0);
+      assert (mantissa < RADIX);
 
-      if ( i != len - 1)
+      if (i != len - 1)
        mantissa++;
 
       result += mantissa * multiplier;
-
-      multiplier *= 26;
+      multiplier *= RADIX;
     }
 
   return result;
 }
 
+/* Convert an integer, which must be non-negative,
+   to pseudo base 26.
+   The caller must free the return value when no longer required.  */
+char *
+int_to_ps26 (int i)
+{
+  char *ret = NULL;
+
+  int lower = 0;
+  long long int base = RADIX;
+  int exp = 1;
+
+  if (i < 0)
+    return NULL;
+
+  while (i > lower + base - 1)
+    {
+      lower += base;
+      base *= RADIX;
+      assert (base > 0);
+      exp++;
+    }
+
+  i -= lower;
+  i += base;
+
+  ret = xmalloc (exp + 1);
+
+  exp = 0;
+  do
+    {
+      ret[exp++] = (i % RADIX) + 'A';
+      i /= RADIX;
+    }
+  while (i > 1);
+
+  ret[exp]='\0';
+
+  reverse (ret, exp);
+  return ret;
+}
+
+
+char *
+create_cell_ref (int col0, int row0)
+{
+  char *cs0 ;
+  char *s ;
+
+  if (col0 < 0) return NULL;
+  if (row0 < 0) return NULL;
+
+  cs0 = int_to_ps26 (col0);
+  s =  c_xasprintf ("%s%d", cs0, row0 + 1);
+
+  free (cs0);
+
+  return s;
+}
+
+char *
+create_cell_range (int col0, int row0, int coli, int rowi)
+{
+  char *s0 = create_cell_ref (col0, row0);
+  char *si = create_cell_ref (coli, rowi);
+
+  char *s =  c_xasprintf ("%s:%s", s0, si);
+
+  free (s0);
+  free (si);
+
+  return s;
+}
+
 
 /* Convert a cell reference in the form "A1:B2", to
    integers.  A1 means column zero, row zero.
@@ -74,16 +233,15 @@ convert_cell_ref (const char *ref,
   int n = sscanf (ref, "%4[a-zA-Z]%d:%4[a-zA-Z]%d",
              startcol, &startrow,
              stopcol, &stoprow);
-  if ( n != 4)
+  if (n != 4)
     return false;
 
   str_uppercase (startcol);
-  *col0 = pseudo_base26 (startcol);
+  *col0 = ps26_to_int (startcol);
   str_uppercase (stopcol);
-  *coli = pseudo_base26 (stopcol);
+  *coli = ps26_to_int (stopcol);
   *row0 = startrow - 1;
   *rowi = stoprow - 1 ;
 
   return true;
 }
-