R6.6 is the Xorg base-lineXORG-MAIN

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+/* $Xorg: expr.h,v 1.3 2000/08/17 19:54:30 cpqbld Exp $ */
+/************************************************************
+ Copyright (c) 1994 by Silicon Graphics Computer Systems, Inc.
+
+ Permission to use, copy, modify, and distribute this
+ software and its documentation for any purpose and without
+ fee is hereby granted, provided that the above copyright
+ notice appear in all copies and that both that copyright
+ notice and this permission notice appear in supporting
+ documentation, and that the name of Silicon Graphics not be 
+ used in advertising or publicity pertaining to distribution 
+ of the software without specific prior written permission.
+ Silicon Graphics makes no representation about the suitability 
+ of this software for any purpose. It is provided "as is"
+ without any express or implied warranty.
+ 
+ SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS 
+ SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 
+ AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
+ GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL 
+ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, 
+ DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 
+ OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION  WITH
+ THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ********************************************************/
+
+#ifndef EXPR_H
+#define EXPR_H 1
+
+typedef union _ExprResult  {
+    char *		str;
+    int			ival;
+    unsigned		uval;
+    XkbKeyNameRec	keyName;
+} ExprResult;
+
+_XFUNCPROTOBEGIN
+
+typedef	Bool	(*IdentLookupFunc)(
+#if NeedFunctionPrototypes
+	XPointer	/* priv */,
+	Atom		/* elem */,
+	Atom		/* field */,
+	unsigned	/* type */,
+	ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern	char *exprTypeText(
+#if NeedFunctionPrototypes
+    unsigned 		/* type */
+#endif
+);
+
+_XFUNCPROTOEND
+
+extern	int ExprResolveLhs(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* elem_rtrn */,
+    ExprResult *	/* field_rtrn */,
+    ExprDef **		/* index_rtrn */
+#endif
+);
+
+typedef	struct _LookupPriv {
+    XPointer 		priv;
+    IdentLookupFunc	chain;
+    XPointer 		chainPriv;
+} LookupPriv;
+
+typedef struct _LookupEntry {
+    char *	name;
+    unsigned	result;
+} LookupEntry;
+
+typedef struct _LookupTable {
+    char *	 		element;
+    LookupEntry	*		entries;
+    struct _LookupTable *	nextElement;
+} LookupTable;
+
+_XFUNCPROTOBEGIN
+
+
+extern char *exprOpText(
+#if NeedFunctionPrototypes
+    unsigned 		/* type */
+#endif
+);
+
+extern int RadioLookup(
+#if NeedFunctionPrototypes
+    XPointer 		/* priv */,
+    Atom		/* elem */,
+    Atom		/* field */,
+    unsigned		/* type */,
+    ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern int SimpleLookup(
+#if NeedFunctionPrototypes
+    XPointer 		/* priv */,
+    Atom		/* elem */,
+    Atom		/* field */,
+    unsigned		/* type */,
+    ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern int TableLookup(
+#if NeedFunctionPrototypes
+    XPointer 		/* priv */,
+    Atom		/* elem */,
+    Atom		/* field */,
+    unsigned		/* type */,
+    ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern int LookupModIndex(
+#if NeedFunctionPrototypes
+    XPointer 		/* priv */,
+    Atom		/* elem */,
+    Atom		/* field */,
+    unsigned		/* type */,
+    ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern int LookupModMask(
+#if NeedFunctionPrototypes
+    XPointer 		/* priv */,
+    Atom		/* elem */,
+    Atom		/* field */,
+    unsigned		/* type */,
+    ExprResult *	/* val_rtrn */
+#endif
+);
+
+extern int ExprResolveModIndex(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveModMask(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* priv */
+#endif
+);
+
+extern int ExprResolveBoolean(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveInteger(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveFloat(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveString(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveKeyName(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveEnum(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    LookupEntry	*	/* values */
+#endif
+);
+
+extern int ExprResolveMask(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+extern int ExprResolveKeySym(
+#if NeedFunctionPrototypes
+    ExprDef *		/* expr */,
+    ExprResult *	/* val_rtrn */,
+    IdentLookupFunc	/* lookup */,
+    XPointer		/* lookupPriv */
+#endif
+);
+
+_XFUNCPROTOEND
+
+#endif /* EXPR_H */