[tracker] libtracker-data: Add support for STRSTARTS/STRENDS builtin functions

[Carlos Garnacho <carlosg src gnome org>]

commit 54aac6a12b2ae575421b391c2eb0812c3f6bc9c4
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 28 20:29:59 2015 +0200

    libtracker-data: Add support for STRSTARTS/STRENDS builtin functions
    
    These are defined in Sparql 1.1 query language recommendation,
    http://www.w3.org/TR/sparql11-query/#func-strstarts
    http://www.w3.org/TR/sparql11-query/#func-strends

 src/libtracker-data/tracker-sparql-expression.vala |   12 ++++++++++++
 src/libtracker-data/tracker-sparql-scanner.vala    |   12 ++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-sparql-expression.vala 
b/src/libtracker-data/tracker-sparql-expression.vala
index bb31628..5b36d19 100644
--- a/src/libtracker-data/tracker-sparql-expression.vala
+++ b/src/libtracker-data/tracker-sparql-expression.vala
@@ -1230,6 +1230,18 @@ class Tracker.Sparql.Expression : Object {
                        type = translate_aggregate_expression (sql);
                        sql.append (")");
                        return PropertyType.INTEGER;
+               case SparqlTokenType.STRSTARTS:
+                       next ();
+                       expect (SparqlTokenType.OPEN_PARENS);
+                       var result = translate_function (sql, FN_NS + "starts-with");
+                       expect (SparqlTokenType.CLOSE_PARENS);
+                       return result;
+               case SparqlTokenType.STRENDS:
+                       next ();
+                       expect (SparqlTokenType.OPEN_PARENS);
+                       var result = translate_function (sql, FN_NS + "ends-with");
+                       expect (SparqlTokenType.CLOSE_PARENS);
+                       return result;
                case SparqlTokenType.SUBSTR:
                        next ();
                        expect (SparqlTokenType.OPEN_PARENS);
diff --git a/src/libtracker-data/tracker-sparql-scanner.vala b/src/libtracker-data/tracker-sparql-scanner.vala
index 903de58..3ffeace 100644
--- a/src/libtracker-data/tracker-sparql-scanner.vala
+++ b/src/libtracker-data/tracker-sparql-scanner.vala
@@ -344,6 +344,10 @@ public class Tracker.SparqlScanner : Object {
                                        break;
                                }
                                break;
+                       case 'S':
+                       case 's':
+                               if (matches (begin, "STRENDS")) return SparqlTokenType.STRENDS;
+                               break;
                        case 'I':
                        case 'i':
                                if (matches (begin, "ISBLANK")) return SparqlTokenType.ISBLANK;
@@ -402,6 +406,10 @@ public class Tracker.SparqlScanner : Object {
                        case 'i':
                                if (matches (begin, "ISLITERAL")) return SparqlTokenType.ISLITERAL;
                                break;
+                       case 'S':
+                       case 's':
+                               if (matches (begin, "STRSTARTS")) return SparqlTokenType.STRSTARTS;
+                               break;
                        }
                        break;
                case 11:
@@ -985,11 +993,13 @@ public enum Tracker.SparqlTokenType {
        SILENT,
        STAR,
        STR,
+       STRENDS,
        STRING_LITERAL1,
        STRING_LITERAL2,
        STRING_LITERAL_LONG1,
        STRING_LITERAL_LONG2,
        STRLEN,
+       STRSTARTS,
        SUBSTR,
        SUM,
        TRUE,
@@ -1087,11 +1097,13 @@ public enum Tracker.SparqlTokenType {
                case SILENT: return "`SILENT'";
                case STAR: return "`*'";
                case STR: return "`STR'";
+               case STRENDS: return "`STRENDS'";
                case STRING_LITERAL1: return "string literal";
                case STRING_LITERAL2: return "string literal";
                case STRING_LITERAL_LONG1: return "string literal";
                case STRING_LITERAL_LONG2: return "string literal";
                case STRLEN: return "`STRLEN'";
+               case STRSTARTS: return "`STRSTARTS'";
                case SUBSTR: return "`SUBSTR'";
                case SUM: return "`SUM'";
                case TRUE: return "`true'";