[tracker] libtracker-data: Add support for the ROUND() builtin function

[Carlos Garnacho <carlosg src gnome org>]

commit 183c6b8d797dc853a3a5888fd102e8748c09f066
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 28 20:30:41 2015 +0200

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

 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 fc69bde..1e39160 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -1292,6 +1292,12 @@ class Tracker.Sparql.Expression : Object {
                        type = translate_aggregate_expression (sql);
                        sql.append (")");
                        return type;
+               case SparqlTokenType.ROUND:
+                       next ();
+                       sql.append ("ROUND(");
+                       type = translate_aggregate_expression (sql);
+                       sql.append (")");
+                       return type;
                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 42d8c54..f23f0f3 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -233,7 +233,16 @@ public class Tracker.SparqlScanner : Object {
                                break;
                        case 'R':
                        case 'r':
-                               if (matches (begin, "REGEX")) return SparqlTokenType.REGEX;
+                               switch (begin[1]) {
+                               case 'E':
+                               case 'e':
+                                       if (matches (begin, "REGEX")) return SparqlTokenType.REGEX;
+                                       break;
+                               case 'O':
+                               case 'o':
+                                       if (matches (begin, "ROUND")) return SparqlTokenType.ROUND;
+                                       break;
+                               }
                                break;
                        case 'U':
                        case 'u':
@@ -992,6 +1001,7 @@ public enum Tracker.SparqlTokenType {
        REDUCED,
        REGEX,
        REPLACE,
+       ROUND,
        SAMETERM,
        SELECT,
        SEMICOLON,
@@ -1097,6 +1107,7 @@ public enum Tracker.SparqlTokenType {
                case REDUCED: return "`REDUCED'";
                case REGEX: return "`REGEX'";
                case REPLACE: return "`REPLACE'";
+               case ROUND: return "`ROUND'";
                case SAMETERM: return "`SAMETERM'";
                case SELECT: return "`SELECT'";
                case SEMICOLON: return "`;'";