[xml] PATCH: XPath eq and neq operators (NON STANDARD ?)

["pwhelan" <pwhelan exis cl>]

Hello 

This patch adds support for the 'eq' and 'neq' operators, in a way so that 
they are just aliases for the '=' and '!=' operators. 

This patch is really just a 'personal itch' kind of thing to handle the 
needs of a customer. 

Thanks for the great library,
Phillip Whelan 


--- libxml2-2.6.27/xpath.c      2006-11-23 14:25:16.000000000 -0300
+++ libxml2-2.6.27-eq-xpath-patch/xpath.c       2007-01-11 13:10:24.000000000 -0300
@@ -10734,6 +10735,32 @@
     }
 }
 
+
+/**
+ * xmlXPathIsEqualityExpr;
+ * @ctxt:  the XPath Parser context
+ *
+ * Test if an expresion is an equality expression.
+ *
+ */
+static int xmlXPathIsEqualityExpr(xmlXPathParserContextPtr ctxt)
+{
+    if ( CUR == '=' )
+       return 1;
+    
+    if ((CUR == '!') && (NXT(1) == '='))
+       return 1;
+    
+    if ((CUR == 'e') && (NXT(1) == 'q'))
+       return 1;
+    
+    if ((CUR == 'n') && (NXT(1) == 'e') && (NXT(2) == 'q'))
+       return 1;
+    
+    return 0;
+}
+
+
 /**
  * xmlXPathCompEqualityExpr:
  * @ctxt:  the XPath Parser context
@@ -10754,15 +10781,23 @@
 xmlXPathCompEqualityExpr(xmlXPathParserContextPtr ctxt) {
     xmlXPathCompRelationalExpr(ctxt);
     CHECK_ERROR;
-    SKIP_BLANKS;
-    while ((CUR == '=') || ((CUR == '!') && (NXT(1) == '='))) {
+    SKIP_BLANKS;    
+    while (xmlXPathIsEqualityExpr(ctxt)) {
        int eq;
        int op1 = ctxt->comp->last;
-
-        if (CUR == '=') eq = 1;
+       
+        if ((CUR == '='))
+               eq = 1; 
+        else if ((CUR == 'e') && (NXT(1) == 'q'))
+               eq = 1;
        else eq = 0;
+       
        NEXT;
-       if (!eq) NEXT;
+       if ((!eq) || (eq && CUR == 'q'))
+               NEXT;
+       if ((!eq) && (CUR == 'q'))
+               NEXT;
+       
        SKIP_BLANKS;
         xmlXPathCompRelationalExpr(ctxt);
        CHECK_ERROR;