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server/internal/library/hggen/views/gohtml/utils.go

@@ -0,0 +1,101 @@
+package gohtml
+
+import (
+	"bytes"
+	"strings"
+	"unicode"
+)
+
+type formatterTokenType int
+
+const (
+	formatterTokenType_Nothing formatterTokenType = iota
+	formatterTokenType_Tag
+	formatterTokenType_Text
+)
+
+type formattedBuffer struct {
+	buffer  *bytes.Buffer
+	rawMode bool
+
+	indentString string
+	indentLevel  int
+
+	lineWrapColumn       int
+	lineWrapMaxSpillover int
+
+	curLineLength int
+	prevTokenType formatterTokenType
+}
+
+func (bf *formattedBuffer) writeLineFeed() {
+	if !bf.rawMode {
+		// Strip trailing newlines
+		bf.buffer = bytes.NewBuffer(bytes.TrimRightFunc(
+			bf.buffer.Bytes(),
+			func(r rune) bool {
+				return r != '\n' && unicode.IsSpace(r)
+			},
+		))
+	}
+
+	bf.buffer.WriteString("\n")
+	bf.curLineLength = 0
+	bf.prevTokenType = formatterTokenType_Nothing
+}
+
+func (bf *formattedBuffer) writeIndent() {
+	bf.buffer.WriteString(strings.Repeat(bf.indentString, bf.indentLevel))
+	bf.curLineLength += len(bf.indentString) * bf.indentLevel
+}
+
+func (bf *formattedBuffer) writeToken(token string, kind formatterTokenType) {
+	if bf.rawMode {
+		bf.buffer.WriteString(token)
+		bf.curLineLength += len(token)
+		return
+	}
+
+	if bf.prevTokenType == formatterTokenType_Nothing && strings.TrimSpace(token) == "" {
+		// It's a whitespace token, but we already have indentation which functions
+		// the same, so we ignore it
+		return
+	}
+
+	toWrite := token
+	if kind == formatterTokenType_Text && bf.prevTokenType == formatterTokenType_Text {
+		toWrite = " " + token
+	}
+
+	if bf.prevTokenType != formatterTokenType_Nothing && bf.lineWrapColumn > 0 {
+		switch {
+		case bf.curLineLength > bf.lineWrapColumn:
+			// Current line is too long
+			fallthrough
+
+		case bf.curLineLength+len(toWrite) > bf.lineWrapColumn+bf.lineWrapMaxSpillover:
+			// Current line + new token is too long even with allowed spillover
+			fallthrough
+
+		case bf.curLineLength+len(toWrite) > bf.lineWrapColumn &&
+			bf.curLineLength > bf.lineWrapColumn-bf.lineWrapMaxSpillover:
+			// Current line + new token is too long and doesn't quality for spillover
+
+			bf.writeLineFeed()
+			bf.writeToken(token, kind)
+			return
+		}
+	}
+
+	if bf.curLineLength == 0 {
+		bf.writeIndent()
+	}
+	bf.buffer.WriteString(toWrite)
+	bf.curLineLength += len(toWrite)
+	bf.prevTokenType = kind
+}
+
+// unifyLineFeed unifies line feeds.
+func unifyLineFeed(s string) string {
+	return strings.Replace(strings.Replace(s, "\r\n", "\n", -1), "\r", "\n", -1)
+}