[tracker/wip/garnacho/sparql1.1: 17/23] libtracker-data: Add support for NOW() builtin function

[Carlos Garnacho <carlosg src gnome org>]

commit 3634e54d333c153a7e32f6c73c1ef58e7f35fd07
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 29 01:07:03 2015 +0200

    libtracker-data: Add support for NOW() builtin function
    
    This function is defined in Sparql 1.1 query language recommendation,
    http://www.w3.org/TR/sparql11-query/#func-now

 src/libtracker-data/tracker-sparql-expression.vala |    6 ++++++
 src/libtracker-data/tracker-sparql-scanner.vala    |   13 ++++++++++++-
 2 files changed, 18 insertions(+), 1 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-expression.vala 
b/src/libtracker-data/tracker-sparql-expression.vala
index ea5c22c..2da4b1f 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -1346,6 +1346,12 @@ class Tracker.Sparql.Expression : Object {
                        expect (SparqlTokenType.CLOSE_PARENS);
                        sql.append ("SparqlRand()");
                        return PropertyType.DOUBLE;
+               case SparqlTokenType.NOW:
+                       next ();
+                       expect (SparqlTokenType.OPEN_PARENS);
+                       expect (SparqlTokenType.CLOSE_PARENS);
+                       sql.append ("strftime('%s', 'now')");
+                       return PropertyType.DATETIME;
                case SparqlTokenType.GROUP_CONCAT:
                        next ();
                        sql.append ("GROUP_CONCAT(");
diff --git a/src/libtracker-data/tracker-sparql-scanner.vala b/src/libtracker-data/tracker-sparql-scanner.vala
index fdd0898..0e73fba 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -121,7 +121,16 @@ public class Tracker.SparqlScanner : Object {
                                break;
                        case 'N':
                        case 'n':
-                               if (matches (begin, "NOT")) return SparqlTokenType.NOT;
+                               switch (begin[2]) {
+                               case 'T':
+                               case 't':
+                                       if (matches (begin, "NOT")) return SparqlTokenType.NOT;
+                                       break;
+                               case 'W':
+                               case 'w':
+                                       if (matches (begin, "NOW")) return SparqlTokenType.NOW;
+                                       break;
+                               }
                                break;
                        case 'S':
                        case 's':
@@ -1018,6 +1027,7 @@ public enum Tracker.SparqlTokenType {
        MINUS,
        NAMED,
        NOT,
+       NOW,
        NULL, /* Non-standard in SPARQL spec */
        OFFSET,
        OP_AND,
@@ -1131,6 +1141,7 @@ public enum Tracker.SparqlTokenType {
                case MINUS: return "`-'";
                case NAMED: return "`NAMED'";
                case NOT: return "`NOT'";
+               case NOW: return "`NOW'";
                case OFFSET: return "`OFFSET'";
                case OP_AND: return "`&&'";
                case OP_EQ: return "`='";