Add intercept module

pkg/search/ast.go

@@ -3,6 +3,7 @@ package search
 import (
 	"encoding/gob"
 	"regexp"
+	"strconv"
 	"strings"
 )
 
@@ -50,13 +51,17 @@ type StringLiteral struct {
 }
 
 func (sl StringLiteral) String() string {
-	return sl.Value
+	return strconv.Quote(sl.Value)
 }
 
 type RegexpLiteral struct {
 	*regexp.Regexp
 }
 
+func (rl RegexpLiteral) String() string {
+	return strconv.Quote(rl.Regexp.String())
+}
+
 func (rl RegexpLiteral) MarshalBinary() ([]byte, error) {
 	return []byte(rl.Regexp.String()), nil
 }

pkg/search/parser.go

@@ -208,7 +208,7 @@ func parseInfixExpression(p *Parser, left Expression) (Expression, error) {
 				return nil, fmt.Errorf("could not compile regular expression %q: %w", rightStr.Value, err)
 			}
 
-			right = re
+			right = RegexpLiteral{re}
 		}
 	}
 

pkg/search/parser_test.go

@@ -94,7 +94,7 @@ func TestParseQuery(t *testing.T) {
 			expectedExpression: InfixExpression{
 				Operator: TokOpRe,
 				Left:     StringLiteral{Value: "foo"},
-				Right:    regexp.MustCompile("bar"),
+				Right:    RegexpLiteral{regexp.MustCompile("bar")},
 			},
 			expectedError: nil,
 		},
@@ -104,7 +104,7 @@ func TestParseQuery(t *testing.T) {
 			expectedExpression: InfixExpression{
 				Operator: TokOpNotRe,
 				Left:     StringLiteral{Value: "foo"},
-				Right:    regexp.MustCompile("bar"),
+				Right:    RegexpLiteral{regexp.MustCompile("bar")},
 			},
 			expectedError: nil,
 		},
@@ -197,7 +197,7 @@ func TestParseQuery(t *testing.T) {
 				Right: InfixExpression{
 					Operator: TokOpRe,
 					Left:     StringLiteral{Value: "baz"},
-					Right:    regexp.MustCompile("yolo"),
+					Right:    RegexpLiteral{regexp.MustCompile("yolo")},
 				},
 			},
 			expectedError: nil,