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

[Carlos Garnacho <carlosg src gnome org>]

commit d48290f437ab00c2662d42c98cd549fac4023848
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 28 20:28:08 2015 +0200

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

 src/libtracker-data/tracker-sparql-expression.vala |    6 ++++++
 src/libtracker-data/tracker-sparql-scanner.vala    |    6 ++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-expression.vala 
b/src/libtracker-data/tracker-sparql-expression.vala
index 8633b20..d9ca3b8 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -1172,6 +1172,12 @@ class Tracker.Sparql.Expression : Object {
                        var result = translate_function (sql, TRACKER_NS + "coalesce");
                        expect (SparqlTokenType.CLOSE_PARENS);
                        return result;
+               case SparqlTokenType.CONCAT:
+                       next ();
+                       expect (SparqlTokenType.OPEN_PARENS);
+                       var result = translate_function (sql, FN_NS + "concat");
+                       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 7a52cdc..77983f4 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -256,6 +256,10 @@ public class Tracker.SparqlScanner : Object {
                        break;
                case 6:
                        switch (begin[0]) {
+                       case 'C':
+                       case 'c':
+                               if (matches (begin, "CONCAT")) return SparqlTokenType.CONCAT;
+                               break;
                        case 'D':
                        case 'd':
                                if (matches (begin, "DELETE")) return SparqlTokenType.DELETE;
@@ -872,6 +876,7 @@ public enum Tracker.SparqlTokenType {
        CLOSE_PARENS,
        COALESCE,
        COLON,
+       CONCAT,
        COMMA,
        CONSTRUCT,
        COUNT,
@@ -972,6 +977,7 @@ public enum Tracker.SparqlTokenType {
                case CLOSE_PARENS: return "`)'";
                case COALESCE: return "`COALESCE'";
                case COLON: return "`:'";
+               case CONCAT: return "`CONCAT'";
                case COMMA: return "`,'";
                case CONSTRUCT: return "`CONSTRUCT'";
                case COUNT: return "`COUNT'";