vendor tsgo

tools/tsgo/internal/testutil/stringtestutil/stringtestutil.go

@@ -0,0 +1,51 @@
+package stringtestutil
+
+import (
+	"strings"
+
+	"github.com/microsoft/typescript-go/internal/stringutil"
+)
+
+func Dedent(text string) string {
+	lines := strings.Split(text, "\n")
+	// Remove blank lines in the beginning and end
+	// and convert all tabs in the beginning of line to spaces
+	startLine := -1
+	lastLine := 0
+	for i, line := range lines {
+		firstNonWhite := strings.IndexFunc(line, func(r rune) bool {
+			return !stringutil.IsWhiteSpaceLike(r)
+		})
+		if firstNonWhite > 0 {
+			line = strings.ReplaceAll(line[0:firstNonWhite], "\t", "    ") + line[firstNonWhite:]
+			lines[i] = line
+		}
+		line = strings.TrimSpace(line)
+		if line != "" {
+			if startLine == -1 {
+				startLine = i
+			}
+			lastLine = i
+		}
+	}
+	lines = lines[startLine : lastLine+1]
+	mappedLines := make([]string, len(lines))
+	for i, line := range lines {
+		if trimmed := strings.TrimSpace(line); trimmed == "" {
+			mappedLines[i] = ""
+		} else {
+			mappedLines[i] = line
+		}
+	}
+	indentation := stringutil.GuessIndentation(mappedLines)
+	if indentation > 0 {
+		for i := range lines {
+			if len(lines[i]) > indentation {
+				lines[i] = lines[i][indentation:]
+			} else {
+				lines[i] = ""
+			}
+		}
+	}
+	return strings.Join(lines, "\n")
+}