Support for abbreviated struct declarations.

ChangeLog

@@ -1,3 +1,14 @@
+2003-05-31  Bruno Haible  <bruno@clisp.org>
+
+	* doc/gperf.texi (User-supplied Struct): Mention the possibility of an
+	abbreviated struct declaration.
+	* src/input.cc (Input::read_input): Support struct declarations of the
+	form "struct foo;".
+	* tests/incomplete.gperf: New file.
+	* tests/incomplete.exp: New file.
+	* tests/Makefile.in (check-test): Check incomplete.gperf too.
+	Reported by Rob Leslie <rob@mars.org>.
+
 2003-05-20  Bruno Haible  <bruno@clisp.org>
 
 	* doc/Makefile.in (gperf.ps): Don't use $< in a target rule.

doc/gperf.texi

@@ -380,7 +380,7 @@ input:
 
 @example
 @group
-struct months @{ char *name; int number; int days; int leap_days; @};
+struct month @{ char *name; int number; int days; int leap_days; @};
 %%
 january,   1, 31, 31
 february,  2, 28, 29
@@ -403,6 +403,18 @@ other fields are a pair of consecutive percent signs, @samp{%%},
 appearing left justified in the first column, as in the UNIX utility
 @code{lex}.
 
+If the @code{struct} has already been declared in an include file, it can
+be mentioned in an abbreviated form, like this:
+
+@example
+@group
+struct month;
+%%
+january,   1, 31, 31
+...
+@end group
+@end example
+
 @node Gperf Declarations, C Code Inclusion, User-supplied Struct, Declarations
 @subsubsection Gperf Declarations
 
@@ -628,9 +640,9 @@ feature:
 %@{
 #include <assert.h>
 /* This section of code is inserted directly into the output. */
-int return_month_days (struct months *months, int is_leap_year);
+int return_month_days (struct month *months, int is_leap_year);
 %@}
-struct months @{ char *name; int number; int days; int leap_days; @};
+struct month @{ char *name; int number; int days; int leap_days; @};
 %%
 january,   1, 31, 31
 february,  2, 28, 29

src/input.cc

@@ -713,7 +713,7 @@ Input::read_input ()
         _struct_decl = struct_decl;
         /* Set _struct_tag to the naked "struct something".  */
         const char *p;
-        for (p = struct_decl; *p && *p != '{' && *p != '\n'; p++)
+        for (p = struct_decl; *p && *p != '{' && *p != ';' && *p != '\n'; p++)
           ;
         for (; p > struct_decl;)
           if (p[-1] == '\n' || p[-1] == ' ' || p[-1] == '\t')

tests/Makefile.in

@@ -162,6 +162,8 @@ check-test:
 	diff $(srcdir)/charsets.exp charsets.out
 	$(GPERF) -C -E -G -I -t < $(srcdir)/languages.gperf > languages.out
 	diff $(srcdir)/languages.exp languages.out
+	$(GPERF) -t < $(srcdir)/incomplete.gperf > incomplete.out
+	diff $(srcdir)/incomplete.exp incomplete.out
 # prints out the help message
 	-$(GPERF) -h > test-6.out
 	diff $(srcdir)/test-6.exp test-6.out

tests/incomplete.exp

@@ -0,0 +1,125 @@
+/* C code produced by gperf version 3.0 */
+/* Command-line: ../src/gperf -t  */
+/* Computed positions: -k'1,3' */
+
+#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
+      && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
+      && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
+      && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
+      && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
+      && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
+      && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
+      && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
+      && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
+      && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
+      && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
+      && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
+      && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
+      && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
+      && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
+      && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
+      && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
+      && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
+      && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
+      && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
+      && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
+      && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
+      && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
+/* The character set is not based on ISO-646.  */
+error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gnu-gperf@gnu.org>."
+#endif
+
+struct month;
+
+#define TOTAL_KEYWORDS 12
+#define MIN_WORD_LENGTH 3
+#define MAX_WORD_LENGTH 9
+#define MIN_HASH_VALUE 3
+#define MAX_HASH_VALUE 18
+/* maximum key range = 16, duplicates = 0 */
+
+#ifdef __GNUC__
+__inline
+#else
+#ifdef __cplusplus
+inline
+#endif
+#endif
+static unsigned int
+hash (str, len)
+     register const char *str;
+     register unsigned int len;
+{
+  static unsigned char asso_values[] =
+    {
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19,  5,  5,  5,
+       0, 19,  5,  0, 19, 19,  0, 19, 10,  0,
+       0,  5,  0, 19,  0,  0,  0, 19,  0, 19,
+      19,  0, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19, 19, 19, 19, 19,
+      19, 19, 19, 19, 19, 19
+    };
+  return len + asso_values[(unsigned char)str[2]] + asso_values[(unsigned char)str[0]];
+}
+
+#ifdef __GNUC__
+__inline
+#endif
+struct month *
+in_word_set (str, len)
+     register const char *str;
+     register unsigned int len;
+{
+  static struct month wordlist[] =
+    {
+      {""}, {""}, {""},
+      {"may",       5, 31, 31},
+      {"june",      6, 30, 30},
+      {"march",     3, 31, 31},
+      {""},
+      {"january",   1, 31, 31},
+      {"november", 11, 30, 30},
+      {"september", 9, 30, 30},
+      {"april",     4, 30, 30},
+      {"august",    8, 31, 31},
+      {"october",  10, 31, 31},
+      {"december", 12, 31, 31},
+      {"july",      7, 31, 31},
+      {""}, {""}, {""},
+      {"february",  2, 28, 29}
+    };
+
+  if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
+    {
+      register int key = hash (str, len);
+
+      if (key <= MAX_HASH_VALUE && key >= 0)
+        {
+          register const char *s = wordlist[key].name;
+
+          if (*str == *s && !strcmp (str + 1, s + 1))
+            return &wordlist[key];
+        }
+    }
+  return 0;
+}

tests/incomplete.gperf

@@ -0,0 +1,14 @@
+struct month;
+%%
+january,   1, 31, 31
+february,  2, 28, 29
+march,     3, 31, 31
+april,     4, 30, 30
+may,       5, 31, 31
+june,      6, 30, 30
+july,      7, 31, 31
+august,    8, 31, 31
+september, 9, 30, 30
+october,  10, 31, 31
+november, 11, 30, 30
+december, 12, 31, 31