[tracker] libtracker-data: Add support for the CONTAINS builtin function

[Carlos Garnacho <carlosg src gnome org>]

commit b8017378897454444e17b1c62e59b4e70c18d321
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 28 20:28:31 2015 +0200

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

 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 d9ca3b8..a4318a3 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -1178,6 +1178,12 @@ class Tracker.Sparql.Expression : Object {
                        var result = translate_function (sql, FN_NS + "concat");
                        expect (SparqlTokenType.CLOSE_PARENS);
                        return result;
+               case SparqlTokenType.CONTAINS:
+                       next ();
+                       expect (SparqlTokenType.OPEN_PARENS);
+                       var result = translate_function (sql, FN_NS + "contains");
+                       expect (SparqlTokenType.CLOSE_PARENS);
+                       return result;
                case SparqlTokenType.IF:
                        return translate_if_call (sql);
                case SparqlTokenType.SAMETERM:
diff --git a/src/libtracker-data/tracker-sparql-scanner.vala b/src/libtracker-data/tracker-sparql-scanner.vala
index 77983f4..cd2f29a 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -328,7 +328,16 @@ public class Tracker.SparqlScanner : Object {
                        switch (begin[0]) {
                        case 'C':
                        case 'c':
-                               if (matches (begin, "COALESCE")) return SparqlTokenType.COALESCE;
+                               switch (begin[2]) {
+                               case 'A':
+                               case 'a':
+                                       if (matches (begin, "COALESCE")) return SparqlTokenType.COALESCE;
+                                       break;
+                               case 'N':
+                               case 'n':
+                                       if (matches (begin, "CONTAINS")) return SparqlTokenType.CONTAINS;
+                                       break;
+                               }
                                break;
                        case 'D':
                        case 'd':
@@ -877,6 +886,7 @@ public enum Tracker.SparqlTokenType {
        COALESCE,
        COLON,
        CONCAT,
+       CONTAINS,
        COMMA,
        CONSTRUCT,
        COUNT,
@@ -978,6 +988,7 @@ public enum Tracker.SparqlTokenType {
                case COALESCE: return "`COALESCE'";
                case COLON: return "`:'";
                case CONCAT: return "`CONCAT'";
+               case CONTAINS: return "`CONTAINS'";
                case COMMA: return "`,'";
                case CONSTRUCT: return "`CONSTRUCT'";
                case COUNT: return "`COUNT'";