Add parse line (#18)

Author: fmenezes

codeowners.go

@@ -1,5 +1,30 @@
 // Package codeowners provides funcionality to evaluate CODEOWNERS file.
 package codeowners // import "github.com/fmenezes/codeowners"
 
+import (
+	"strings"
+	"unicode"
+)
+
 // DefaultLocations provides default locations for the CODEOWNERS file
 var DefaultLocations = [...]string{"CODEOWNERS", "docs/CODEOWNERS", ".github/CODEOWNERS"}
+
+// ParseLine parses a CODEOWNERS line into file pattern and owners
+func ParseLine(line string) (string, []string) {
+	line = sanitiseLine(line)
+
+	var previousRune rune
+	data := strings.FieldsFunc(line, func(r rune) bool {
+		result := unicode.IsSpace(r) && previousRune != '\\'
+		previousRune = r
+		return result
+	})
+
+	if len(data) > 1 {
+		return data[0], data[1:]
+	} else if len(data) == 1 {
+		return data[0], nil
+	} else {
+		return "", nil
+	}
+}

codeowners_test.go

@@ -0,0 +1,59 @@
+package codeowners_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/fmenezes/codeowners"
+)
+
+func TestParseLine(t *testing.T) {
+	testCases := []struct {
+		input       string
+		wantPattern string
+		wantOwners  []string
+	}{
+		{
+			input:       "* test@example.org",
+			wantPattern: "*",
+			wantOwners:  []string{"test@example.org"},
+		},
+		{
+			input:       "filepattern test@example.org @owner @company/team",
+			wantPattern: "filepattern",
+			wantOwners:  []string{"test@example.org", "@owner", "@company/team"},
+		},
+		{
+			input:       "file\\ with\\ spaces @owner",
+			wantPattern: "file\\ with\\ spaces",
+			wantOwners:  []string{"@owner"},
+		},
+		{
+			input:       "    filepattern    ",
+			wantPattern: "filepattern",
+			wantOwners:  nil,
+		},
+		{
+			input:       "filepattern @owner # comments",
+			wantPattern: "filepattern",
+			wantOwners:  []string{"@owner"},
+		},
+		{
+			input:       "",
+			wantPattern: "",
+			wantOwners:  nil,
+		},
+		{
+			input:       "# only comments on the line",
+			wantPattern: "",
+			wantOwners:  nil,
+		},
+	}
+
+	for _, testCase := range testCases {
+		gotPattern, gotOwners := codeowners.ParseLine(testCase.input)
+		if gotPattern != testCase.wantPattern || !reflect.DeepEqual(gotOwners, testCase.wantOwners) {
+			t.Errorf("Input: %s, Want: %s, %v, Got: %s, %v", testCase.input, testCase.wantPattern, testCase.wantOwners, gotPattern, gotOwners)
+		}
+	}
+}

decoder.go

@@ -59,18 +59,11 @@ func (d *Decoder) More() bool {
 // If More was never called it will return an empty token.
 // After end of file Token will always return the last line.
 func (d *Decoder) Token() (Token, int) {
-	line := sanitiseLine(d.line)
-	line = strings.ReplaceAll(line, "\\ ", "\\s")
-
-	data := strings.Split(line, " ")
-
-	for i := range data {
-		data[i] = strings.ReplaceAll(data[i], "\\s", " ")
-	}
+	pattern, owners := ParseLine(d.line)
 
 	return Token{
-		path:   data[0],
-		owners: data[1:],
+		path:   pattern,
+		owners: owners,
 	}, d.lineNo
 }
 

decoder_test.go

@@ -46,7 +46,7 @@ func TestMultipleOwners(t *testing.T) {
 
 func TestFilesWithSpaces(t *testing.T) {
 	assert(t, `file\ with\ spaces @owner`, [][]string{
-		{"1", "file with spaces", "@owner"},
+		{"1", "file\\ with\\ spaces", "@owner"},
 	})
 }