From: John Darrington <john@darrington.wattle.id.au>
Date: Mon, 6 Oct 2008 03:02:49 +0000 (+0800)
Subject: Allow hyphens in {sub}command names.
X-Git-Tag: v0.7.1~50^2~40
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ff46735d4c81b49fa17c8bd26f3f5dd7bde9a15d;p=pspp-builds.git

Allow hyphens in {sub}command names.

Extend the lexer so as to allow hypens to appear
in the identifiers which of subcommands.
---

diff --git a/src/language/lexer/lexer.c b/src/language/lexer/lexer.c
index 1c9542d7..5b24522f 100644
--- a/src/language/lexer/lexer.c
+++ b/src/language/lexer/lexer.c
@@ -1304,3 +1304,28 @@ lex_tokstr (const struct lexer *lexer)
 {
   return &lexer->tokstr;
 }
+
+/* If the lexer is positioned at the (pseudo)identifier S, which
+   may contain a hyphen ('-'), skips it and returns true.  Each
+   half of the identifier may be abbreviated to its first three
+   letters.
+   Otherwise, returns false. */
+bool
+lex_match_hyphenated_word (struct lexer *lexer, const char *s)
+{
+  const char *hyphen = strchr (s, '-');
+  if (hyphen == NULL)
+    return lex_match_id (lexer, s);
+  else if (lexer->token != T_ID
+	   || !lex_id_match (ss_buffer (s, hyphen - s), ss_cstr (lexer->tokid))
+	   || lex_look_ahead (lexer) != '-')
+    return false;
+  else
+    {
+      lex_get (lexer);
+      lex_force_match (lexer, '-');
+      lex_force_match_id (lexer, hyphen + 1);
+      return true;
+    }
+}
+
diff --git a/src/language/lexer/lexer.h b/src/language/lexer/lexer.h
index 53732b49..9e5d09ae 100644
--- a/src/language/lexer/lexer.h
+++ b/src/language/lexer/lexer.h
@@ -55,6 +55,8 @@ bool lex_match (struct lexer *, int);
 bool lex_match_id (struct lexer *, const char *);
 bool lex_match_id_n (struct lexer *, const char *, size_t n);
 bool lex_match_int (struct lexer *, int);
+bool lex_match_hyphenated_word (struct lexer *lexer, const char *s);
+
 
 /* Forcible matching functions. */
 bool lex_force_match (struct lexer *, int);
diff --git a/src/language/lexer/q2c.c b/src/language/lexer/q2c.c
index d14c69d0..3e23390f 100644
--- a/src/language/lexer/q2c.c
+++ b/src/language/lexer/q2c.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+   Copyright (C) 1997-9, 2000, 2008 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
@@ -357,6 +357,44 @@ dump_token (void)
 }
 #endif /* DUMP_TOKENS */
 
+
+const char hyphen_proxy = '_';
+
+static void
+id_cpy (char **cp)
+{
+  char *dest = tokstr;
+  char *src = *cp;
+
+  while (*src == '_' || *src == '-' || isalnum ((unsigned char) *src))
+    {
+      *dest++ = *src == '-' ? hyphen_proxy :toupper ((unsigned char) (*src));
+      src++;
+    }
+
+  *cp = src;
+  *dest++ = '\0';
+}
+
+static const char *
+unmunge (const char *s)
+{
+  char *dest = xmalloc (strlen (s));
+  char *d = dest;
+
+  while (*s)
+    {
+      if (*s == hyphen_proxy)
+	*d = '-';
+      else
+	*d = *s;
+      s++;
+      d++;
+    }
+
+  return dest;
+}
+
 /* Reads a token from the input file. */
 static int
 lex_get (void)
@@ -398,9 +436,8 @@ lex_get (void)
     {
       char *dest = tokstr;
       token = T_ID;
-      while (*cp == '_' || isalnum ((unsigned char) *cp))
-	*dest++ = toupper ((unsigned char) (*cp++));
-      *dest++ = '\0';
+
+      id_cpy (&cp);
     }
   else
     token = *cp++;
@@ -1374,7 +1411,11 @@ make_match (const char *t)
   else if (isdigit ((unsigned char) t[0]))
     sprintf (s, "lex_match_int (lexer, %s)", t);
   else
-    sprintf (s, "lex_match_id (lexer, \"%s\")", t);
+    {
+      char *c = unmunge (t);
+      sprintf (s, "lex_match_hyphenated_word (lexer, \"%s\")", c);
+      free (c);
+    }
 
   return s;
 }