stdlib.strings

Added string functions to standard library

pkg/stdlib/strings/trim.go

@@ -0,0 +1,77 @@
+package strings
+
+import (
+	"context"
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+	"strings"
+)
+
+/*
+ * Returns the string value with whitespace stripped from the start and/or end.
+ * @param value (String) - The string.
+ * @param chars (String) - Overrides the characters that should be removed from the string. It defaults to \r\n \t.
+ * @returns (String) - The string without chars on both sides.
+ */
+func Trim(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 1, 2)
+
+	if err != nil {
+		return values.EmptyString, err
+	}
+
+	text := args[0].String()
+	chars := " "
+
+	if len(args) > 1 {
+		chars = args[1].String()
+	}
+
+	return values.NewString(strings.Trim(text, chars)), nil
+}
+
+/*
+ * Returns the string value with whitespace stripped from the start only.
+ * @param value (String) - The string.
+ * @param chars (String) - Overrides the characters that should be removed from the string. It defaults to \r\n \t.
+ * @returns (String) - The string without chars at the left-hand side.
+ */
+func LTrim(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 1, 2)
+
+	if err != nil {
+		return values.EmptyString, err
+	}
+
+	text := args[0].String()
+	chars := " "
+
+	if len(args) > 1 {
+		chars = args[1].String()
+	}
+
+	return values.NewString(strings.TrimLeft(text, chars)), nil
+}
+
+/*
+ * Returns the string value with whitespace stripped from the end only.
+ * @param value (String) - The string.
+ * @param chars (String) - Overrides the characters that should be removed from the string. It defaults to \r\n \t.
+ * @returns (String) - The string without chars at the right-hand side.
+ */
+func RTrim(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 1, 2)
+
+	if err != nil {
+		return values.EmptyString, err
+	}
+
+	text := args[0].String()
+	chars := " "
+
+	if len(args) > 1 {
+		chars = args[1].String()
+	}
+
+	return values.NewString(strings.TrimRight(text, chars)), nil
+}