From 3bdb92524be3710622e1a9ed2be4f8a0ec9b7a61 Mon Sep 17 00:00:00 2001
From: alexhudson <alexhudson@52461e19-6027-0410-9301-c4706890ca92>
Date: Thu, 24 Jun 2010 19:54:25 +0000
Subject: [PATCH] Pretty ropey initial support for a '^' BQL operator that
 behaves like LIKE.

---
 src/agents/store/query-builder.c | 24 ++++++++++++++++++++++--
 src/agents/store/query-parser.c  | 19 ++++++++++++++++++-
 src/agents/store/query-parser.h  |  1 +
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/src/agents/store/query-builder.c b/src/agents/store/query-builder.c
index 476cdfd..4623360 100644
--- a/src/agents/store/query-builder.c
+++ b/src/agents/store/query-builder.c
@@ -423,6 +423,7 @@ QueryBuilderCreateSQL(QueryBuilder *builder, char **output)
 	BongoStringBuilderAppend(&b, ";");
 	
 	*output = MemStrdup(b.value);
+	printf("SQL: '%s'\n", b.value);
 	
 	BongoStringBuilderDestroy(&b);
 	
@@ -476,7 +477,7 @@ AddExpValueByProperty(QueryBuilder *b, BongoStringBuilder *sb, void *exp, int co
 static int
 QueryExpressionToSQL(QueryBuilder *builder, struct expression *exp, BongoStringBuilder *sb)
 {
-	const char basic_ops[] = "&|<>=!~";
+	const char basic_ops[] = "&|<>=!~^";
 	int retcode = 0;
 	
 	for (unsigned int i=0; i < sizeof(basic_ops); i++) {
@@ -504,12 +505,31 @@ QueryExpressionToSQL(QueryBuilder *builder, struct expression *exp, BongoStringB
 				case '!':
 					BongoStringBuilderAppend(sb, " != ");
 					break;
+				case '^':
+					BongoStringBuilderAppend(sb, " LIKE ");
+					break;
 				default: 
 					// return 0;
 					break;
 			}
 			
-			retcode = AddExpValueByProperty(builder, sb, exp->exp2, exp->exp2_const);
+			char *val = exp->exp2;
+			if (exp->op[0] == '^') {
+				// special case for LIKE: we need to stick % on the param
+				int len = strlen(exp->exp2);
+				val = malloc(len + 4);
+				val[0] = '\''; val[1] = '%';
+				char *expression = (char*)exp->exp2;
+				for(int i=1; i < len; i++) val[i+1] = expression[i];
+				val[len] = '%';
+				val[len+1] = '\'';
+				val[len+2] = '\0';
+			}
+			
+			retcode = AddExpValueByProperty(builder, sb, val, exp->exp2_const);
+			
+			if (val != exp->exp2) free(val);
+			
 			if (retcode) return retcode;
 			
 			BongoStringBuilderAppend(sb, ")");
diff --git a/src/agents/store/query-parser.c b/src/agents/store/query-parser.c
index fa01502..42a8ff3 100644
--- a/src/agents/store/query-parser.c
+++ b/src/agents/store/query-parser.c
@@ -76,7 +76,7 @@ pull_token(char **query, char **out_token)
 int
 QueryParser_IsOp (const char *token)
 {
-	const char *ops = "&|<>=!{l~";
+	const char *ops = "&|<>=!{l~^";
 	
 	// operations must be single characters
 	if (token[1] != '\0') return -1;
@@ -88,6 +88,16 @@ QueryParser_IsOp (const char *token)
 	return -1;
 }
 
+int
+QueryParser_CanSubExp (const char *token)
+{
+	// this is true for any operator that can take sub-expressions.
+	// basically just the boolean operators.
+	if (token[0] == '&') return 0;
+	if (token[0] == '|') return 0;
+	return -1;
+}
+
 #define CHAR_IS_LC_ALPHA(x)	(((x) >= 'a') && ((x) <= 'z'))
 #define CHAR_IS_NUMBER(x)	(((x) >= '0') && ((x) <= '9'))
 #define CHAR_IS_PERIOD(x)	((x) == '.')
@@ -194,6 +204,13 @@ QueryParserRun(struct parser_state *state, BOOL strict_quotes)
 		}
 		if (QueryParser_IsOp(token) == 0) {
 			if (current_expression->op != NULL) {
+				// check this operator will allow sub-expressions
+				// TODO - this isn't quite right yet.
+				//if (QueryParser_CanSubExp(current_expression->op) == 0) {
+				//	DEBUG_MESSAGE("ERR: Cannot accept subexpression at this point\n");
+				//	return -1;
+				//}
+				
 				// need to find a free expr slot
 				struct expression *next_expression = ++(state->last);
 				
diff --git a/src/agents/store/query-parser.h b/src/agents/store/query-parser.h
index e928f14..9cf9665 100644
--- a/src/agents/store/query-parser.h
+++ b/src/agents/store/query-parser.h
@@ -32,6 +32,7 @@ int	QueryParserRun(struct parser_state *state, BOOL strict_quotes);
 void	QueryParserFinish(struct parser_state *state);
 
 int	QueryParser_IsOp (const char *token);
+int	QueryParser_CanSubExp (const char *token);
 int	QueryParser_IsProperty (const char *token);
 int QueryParser_IsNumber (const char *token);
 int QueryParser_IsString (const char *token);