From e854143a6dc4743106cc775f37e3a2226cbb18c5 Mon Sep 17 00:00:00 2001
From: siboud <siboud@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Mon, 7 Feb 2005 04:03:13 +0000
Subject: [PATCH] more work on filter.c

git-svn-id: http://ltt.polymtl.ca/svn@867 04897980-b3bd-0310-b5e0-8ef037075253
---
 ltt/branches/poly/lttv/lttv/filter.c | 49 +++++++++++++++++++++++-----
 1 file changed, 41 insertions(+), 8 deletions(-)

diff --git a/ltt/branches/poly/lttv/lttv/filter.c b/ltt/branches/poly/lttv/lttv/filter.c
index a25b99c4..380cfe06 100644
--- a/ltt/branches/poly/lttv/lttv/filter.c
+++ b/ltt/branches/poly/lttv/lttv/filter.c
@@ -58,7 +58,6 @@ parse_simple_expression(GString* expression) {
 	unsigned i;
 
 	for(i=0;i<strlen(expression);i++) {
-		
 
 	}
 }
@@ -79,8 +78,9 @@ lttv_filter_new(char *expression, LttvTrace *t) {
 	
 	gpointer tree;
 		
-	GString *currentOption = g_string_new(""); 
-		
+	GString *current_option = g_string_new(""); 
+	lttv_simple_expression current_expression;
+	
 	g_print("filter::lttv_filter_new()\n");		/* debug */
 
 	/*
@@ -98,10 +98,19 @@ lttv_filter_new(char *expression, LttvTrace *t) {
 	
 	/*
 	 *	Parse entire expression and construct
-	 *	the binary tree
+	 *	the binary tree.  There are two steps 
+   *	in browsing that string
+   *	  1. finding boolean ops ( &,|,^,! ) and parenthesis
+   *	  2. finding simple expressions
+   *	    - field path
+   *	    - op ( >, <, =, >=, <=, !=)
+   *	    - value
 	 */
 	for(i=0;i<strlen(expression);i++) {
 		switch(expression[i]) {
+      /*
+       *  boolean operators
+       */
 			case '&':		/* and */
 				parse_simple_expression(currentOption);
 				g_print("%s\n",&currentOption);
@@ -115,16 +124,40 @@ lttv_filter_new(char *expression, LttvTrace *t) {
 				g_print("%s\n",currentOption);
 				currentOption = g_string_new("");
 				break;
-			case '!':		/* not */
-				g_print("%s\n",currentOption);
-				currentOption = g_string_new("");
-				break;
+			case '!':		/* not, or not equal (math op) */
+        if(expression[i+1] == '=') {  /* != */
+          current_expression.op = LTTV_FIELD_NE;
+          i++;
+        } else {  /* ! */
+  				g_print("%s\n",currentOption);
+  				currentOption = g_string_new("");
+        }
+        break;
 			case '(':		/* start of parenthesis */
 				p++;
 				break;
 			case ')':		/* end of parenthesis */
 				p--;
 				break;
+      /*
+       *  mathematic operators
+       */
+      case '<':   /* lower, lower or equal */
+        if(expression[i+1] == '=') { /* <= */
+          i++;
+          current_expression.op = LTTV_FIELD_LE;                  
+        } else current_expression.op = LTTV_FIELD_LT;
+        break;
+      case '>':   /* higher, higher or equal */
+        if(expression[i+1] == '=') { /* >= */
+          i++;
+          current_expression.op = LTTV_FIELD_GE;                  
+        } else current_expression.op = LTTV_FIELD_GT;
+        break;
+      case '=':   /* equal */
+        current_expression.op = LTTV_FIELD_EQ;
+        break;
+      case 
 			default:		/* concatening current string */
 				g_string_append_c(currentOption,expression[i]); 				
 		}
-- 
2.34.1