From 61b18456d7c8a89fdddee64dd410ff9d30a6327e Mon Sep 17 00:00:00 2001
From: Zhang Eric <Xing.Zhang@anz.com>
Date: Mon, 11 May 2020 23:34:50 +0800
Subject: [PATCH] #234 Added new func to std_seq.go.

---
 syntax/std_seq.go      | 36 ++++++++++++++++++++++++++++++++++++
 syntax/std_seq_test.go |  5 +++++
 2 files changed, 41 insertions(+)

diff --git a/syntax/std_seq.go b/syntax/std_seq.go
index 4259ad2e..fda3b94e 100644
--- a/syntax/std_seq.go
+++ b/syntax/std_seq.go
@@ -64,5 +64,41 @@ func stdSeq() rel.Attr {
 	return rel.NewTupleAttr("seq",
 		rel.NewNativeFunctionAttr("concat", stdSeqConcat),
 		rel.NewNativeFunctionAttr("repeat", stdSeqRepeat),
+		createNestedFuncAttr("contains", 2, func(args ...rel.Value) rel.Value {
+			return rel.NewBool(strings.Contains(mustAsString(args[0]), mustAsString(args[1])))
+		}),
+		createNestedFuncAttr("split", 2, func(args ...rel.Value) rel.Value {
+			splitted := strings.Split(mustAsString(args[0]), mustAsString(args[1]))
+			vals := make([]rel.Value, 0, len(splitted))
+			for _, s := range splitted {
+				vals = append(vals, rel.NewString([]rune(s)))
+			}
+			return rel.NewArray(vals...)
+		}),
+		createNestedFuncAttr("sub", 3, func(args ...rel.Value) rel.Value {
+			return rel.NewString(
+				[]rune(
+					strings.ReplaceAll(
+						mustAsString(args[0]),
+						mustAsString(args[1]),
+						mustAsString(args[2]),
+					),
+				),
+			)
+		}),
+		createNestedFuncAttr("has_prefix", 2, func(args ...rel.Value) rel.Value {
+			return rel.NewBool(strings.HasPrefix(mustAsString(args[0]), mustAsString(args[1])))
+		}),
+		createNestedFuncAttr("has_suffix", 2, func(args ...rel.Value) rel.Value {
+			return rel.NewBool(strings.HasPrefix(mustAsString(args[0]), mustAsString(args[1])))
+		}),
+		createNestedFuncAttr("join", 2, func(args ...rel.Value) rel.Value {
+			strs := args[0].(rel.Set)
+			toJoin := make([]string, 0, strs.Count())
+			for i, ok := strs.(rel.Set).ArrayEnumerator(); ok && i.MoveNext(); {
+				toJoin = append(toJoin, mustAsString(i.Current()))
+			}
+			return rel.NewString([]rune(strings.Join(toJoin, mustAsString(args[1]))))
+		}),
 	)
 }
diff --git a/syntax/std_seq_test.go b/syntax/std_seq_test.go
index 9365218a..7b73ad70 100644
--- a/syntax/std_seq_test.go
+++ b/syntax/std_seq_test.go
@@ -36,3 +36,8 @@ func TestSeqRepeat(t *testing.T) {
 
 	AssertCodePanics(t, `//seq.repeat(2, 3.4)`)
 }
+
+func TestSeqContains(t *testing.T) {
+	t.Parallel()
+
+}