[bugfix] Markdown formatting updates (#743)

* add minify dependency specifically for markdown

* rearrange markdown formatting

* update markdown tests

vendor/github.com/tdewolff/parse/v2/html/util.go

@@ -0,0 +1,113 @@
+package html
+
+var (
+	singleQuoteEntityBytes = []byte("'")
+	doubleQuoteEntityBytes = []byte(""")
+)
+
+// EscapeAttrVal returns the escaped attribute value bytes with quotes. Either single or double quotes are used, whichever is shorter. If there are no quotes present in the value and the value is in HTML (not XML), it will return the value without quotes.
+func EscapeAttrVal(buf *[]byte, b []byte, origQuote byte, mustQuote, isXML bool) []byte {
+	singles := 0
+	doubles := 0
+	unquoted := true
+	for _, c := range b {
+		if charTable[c] {
+			unquoted = false
+			if c == '"' {
+				doubles++
+			} else if c == '\'' {
+				singles++
+			}
+		}
+	}
+	if unquoted && (!mustQuote || origQuote == 0) && !isXML {
+		return b
+	} else if singles == 0 && origQuote == '\'' && !isXML || doubles == 0 && origQuote == '"' {
+		if len(b)+2 > cap(*buf) {
+			*buf = make([]byte, 0, len(b)+2)
+		}
+		t := (*buf)[:len(b)+2]
+		t[0] = origQuote
+		copy(t[1:], b)
+		t[1+len(b)] = origQuote
+		return t
+	}
+
+	n := len(b) + 2
+	var quote byte
+	var escapedQuote []byte
+	if singles >= doubles || isXML {
+		n += doubles * 4
+		quote = '"'
+		escapedQuote = doubleQuoteEntityBytes
+		if singles == doubles && origQuote == '\'' && !isXML {
+			quote = '\''
+			escapedQuote = singleQuoteEntityBytes
+		}
+	} else {
+		n += singles * 4
+		quote = '\''
+		escapedQuote = singleQuoteEntityBytes
+	}
+	if n > cap(*buf) {
+		*buf = make([]byte, 0, n) // maximum size, not actual size
+	}
+	t := (*buf)[:n] // maximum size, not actual size
+	t[0] = quote
+	j := 1
+	start := 0
+	for i, c := range b {
+		if c == quote {
+			j += copy(t[j:], b[start:i])
+			j += copy(t[j:], escapedQuote)
+			start = i + 1
+		}
+	}
+	j += copy(t[j:], b[start:])
+	t[j] = quote
+	return t[:j+1]
+}
+
+var charTable = [256]bool{
+	// ASCII
+	false, false, false, false, false, false, false, false,
+	false, true, true, false, true, true, false, false, // tab, line feed, form feed, carriage return
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	true, false, true, false, false, false, false, true, // space, "), '
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, true, true, true, false, // <, =, >
+
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	true, false, false, false, false, false, false, false, // `
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	// non-ASCII
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+	false, false, false, false, false, false, false, false,
+}