Add simple string conversion and match expressions

core/mapper/exprmapper/function/string/match/match.go

@@ -0,0 +1,31 @@
+package match
+
+import (
+	"regexp"
+
+	"github.com/TIBCOSoftware/flogo-lib/core/mapper/exprmapper/expression/function"
+	"github.com/TIBCOSoftware/flogo-lib/logger"
+)
+
+var log = logger.GetLogger("match-function")
+
+type Match struct {
+}
+
+func init() {
+	function.Registry(&Match{})
+}
+
+func (s *Match) GetName() string {
+	return "match"
+}
+
+func (s *Match) GetCategory() string {
+	return "string"
+}
+func (s *Match) Eval(expr string, inp string) bool {
+
+	match, _ := regexp.MatchString(expr, inp)
+	log.Infof(`Input "%v" matches: "%v" `, inp, match)
+	return match
+}

core/mapper/exprmapper/function/string/match/match_test.go

@@ -0,0 +1,28 @@
+package match
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/TIBCOSoftware/flogo-lib/core/mapper/exprmapper/expression"
+	"github.com/stretchr/testify/assert"
+)
+
+var s = &Match{}
+
+func TestStaticFunc_Starts_with(t *testing.T) {
+	final1 := s.Eval("p([a-z]+)ch", "peach")
+	fmt.Println(final1)
+	assert.Equal(t, true, final1)
+
+}
+
+func TestExpression(t *testing.T) {
+	fun, err := expression.ParseExpression(`string.match("p([a-z]+)ch", "peach")`)
+	assert.Nil(t, err)
+	assert.NotNil(t, fun)
+	v, err := fun.Eval()
+	assert.Nil(t, err)
+	assert.NotNil(t, v)
+	assert.Equal(t, true, v)
+}

core/mapper/exprmapper/function/string/tostring/tostring.go

@@ -0,0 +1,31 @@
+package tostring
+
+import (
+	"fmt"
+
+	"github.com/TIBCOSoftware/flogo-lib/core/mapper/exprmapper/expression/function"
+	"github.com/TIBCOSoftware/flogo-lib/logger"
+)
+
+var log = logger.GetLogger("tostring-function")
+
+type ToString struct {
+}
+
+func init() {
+	function.Registry(&ToString{})
+}
+
+func (s *ToString) GetName() string {
+	return "toString"
+}
+
+func (s *ToString) GetCategory() string {
+	return "string"
+}
+func (s *ToString) Eval(inp interface{}) string {
+
+	result := fmt.Sprintf("%v", inp)
+	log.Debugf(`Converts value to a simple string: "%s" `, result)
+	return result
+}

core/mapper/exprmapper/function/string/tostring/tostring_test.go

@@ -0,0 +1,32 @@
+package tostring
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/TIBCOSoftware/flogo-lib/core/mapper/exprmapper/expression"
+	"github.com/stretchr/testify/assert"
+)
+
+var s = &ToString{}
+
+func TestStaticFunc_Starts_with(t *testing.T) {
+	final1 := s.Eval(1)
+	fmt.Println(final1)
+	assert.Equal(t, "1", final1)
+
+	final2 := s.Eval(1.23)
+	fmt.Println(final2)
+	assert.Equal(t, "1.23", final2)
+
+}
+
+func TestExpression(t *testing.T) {
+	fun, err := expression.ParseExpression(`string.tostring(3.456)`)
+	assert.Nil(t, err)
+	assert.NotNil(t, fun)
+	v, err := fun.Eval()
+	assert.Nil(t, err)
+	assert.NotNil(t, v)
+	assert.Equal(t, "3.456", v)
+}