From 238e83ec28c72447ca8a457a1dded85661d813bd Mon Sep 17 00:00:00 2001
From: Tarun Koyalwar <tarun@projectdiscovery.io>
Date: Wed, 26 Jul 2023 18:21:31 +0530
Subject: [PATCH 1/2] add parsing Err var

---
 dsl.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dsl.go b/dsl.go
index 02d2911..52419dd 100644
--- a/dsl.go
+++ b/dsl.go
@@ -57,6 +57,10 @@ var (
 	DefaultHelperFunctions map[string]govaluate.ExpressionFunction
 
 	funcSignatureRegex = regexp.MustCompile(`(\w+)\s*\((?:([\w\d,\s]+)\s+([.\w\d{}&*]+))?\)([\s.\w\d{}&*]+)?`)
+
+	// ErrParsingArg is error when parsing value of argument
+	// Use With Caution: Nuclei ignores this error in extractors(ref: https://github.com/projectdiscovery/nuclei/issues/3950)
+	ErrParsingArg = errors.New("error parsing argument value")
 )
 
 var PrintDebugCallback func(args ...interface{}) error
@@ -771,7 +775,7 @@ func init() {
 
 			firstParsed, parseErr := version.NewVersion(toString(args[0]))
 			if parseErr != nil {
-				return nil, parseErr
+				return nil, ErrParsingArg
 			}
 
 			var versionConstraints []string

From de9bd3c7089101d0ca3406bd6a993caf14cc1ad0 Mon Sep 17 00:00:00 2001
From: Tarun Koyalwar <tarun@projectdiscovery.io>
Date: Fri, 28 Jul 2023 17:48:43 +0530
Subject: [PATCH 2/2] propogate err with ErrParsingErr

---
 dsl.go | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/dsl.go b/dsl.go
index 52419dd..512c83b 100644
--- a/dsl.go
+++ b/dsl.go
@@ -36,13 +36,13 @@ import (
 	"github.com/hashicorp/go-version"
 	"github.com/kataras/jwt"
 	"github.com/logrusorgru/aurora"
-	"github.com/pkg/errors"
 	"github.com/projectdiscovery/dsl/deserialization"
 	"github.com/projectdiscovery/dsl/llm"
 	"github.com/projectdiscovery/dsl/randomip"
 	"github.com/projectdiscovery/gologger"
 	"github.com/projectdiscovery/mapcidr"
 	jarm "github.com/projectdiscovery/utils/crypto/jarm"
+	errors "github.com/projectdiscovery/utils/errors"
 	maputils "github.com/projectdiscovery/utils/maps"
 	randint "github.com/projectdiscovery/utils/rand"
 	stringsutil "github.com/projectdiscovery/utils/strings"
@@ -775,7 +775,7 @@ func init() {
 
 			firstParsed, parseErr := version.NewVersion(toString(args[0]))
 			if parseErr != nil {
-				return nil, ErrParsingArg
+				return nil, errors.NewWithErr(ErrParsingArg).Wrap(parseErr)
 			}
 
 			var versionConstraints []string
@@ -846,10 +846,10 @@ func init() {
 			}
 			start, err := strconv.Atoi(toString(args[1]))
 			if err != nil {
-				return nil, errors.Wrap(err, "invalid start position")
+				return nil, errors.NewWithErr(err).Msgf("invalid start position")
 			}
 			if start > len(argStr) {
-				return nil, errors.Wrap(err, "start position bigger than slice length")
+				return nil, errors.NewWithErr(err).Msgf("start position bigger than slice length")
 			}
 			if len(args) == 2 {
 				return argStr[start:], nil
@@ -857,16 +857,16 @@ func init() {
 
 			end, err := strconv.Atoi(toString(args[2]))
 			if err != nil {
-				return nil, errors.Wrap(err, "invalid end position")
+				return nil, errors.NewWithErr(err).Msgf("invalid end position")
 			}
 			if end < 0 {
-				return nil, errors.Wrap(err, "negative end position")
+				return nil, errors.NewWithErr(err).Msgf("negative end position")
 			}
 			if end < start {
-				return nil, errors.Wrap(err, "end position before start")
+				return nil, errors.NewWithErr(err).Msgf("end position before start")
 			}
 			if end > len(argStr) {
-				return nil, errors.Wrap(err, "end position bigger than slice length start")
+				return nil, errors.NewWithErr(err).Msgf("end position bigger than slice length start")
 			}
 			return argStr[start:end], nil
 		}))