Complete Step 181

editor/document/row.go

@@ -133,14 +133,28 @@ func (r *Row) updateSyntax() {
 	keywords1 := s.Keywords1
 	keywords2 := s.Keywords2
 
+	// Scan for comments
 	var scsIndex int = -1
+	var mcsIndex int = -1
+	var mceIndex int = -1
 	scs := s.LineCommentStart
+	mcs := s.MultilineCommentStart
+	mce := s.MultilineCommentEnd
+	hasMcs := len(mcs) > 0
+	hasMce := len(mce) > 0
 	if len(scs) > 0 {
 		scsIndex = strings.Index(renderStr, scs)
 	}
+	if hasMcs {
+		mcsIndex = strings.Index(renderStr, mcs)
+	}
+	if hasMce {
+		mceIndex = strings.Index(renderStr, mce)
+	}
 
 	prevSep := true
 	inString := '0'
+	inComment := false
 	for i < r.RenderSize() {
 		ch := r.render[i]
 		prevHl := highlight.Normal
@@ -151,13 +165,43 @@ func (r *Row) updateSyntax() {
 		ip1 := i + 1
 
 		// Single line comments
-		if inString == '0' && scsIndex == i {
+		if inString == '0' && !inComment && scsIndex == i {
 			for j := scsIndex; j < renderLen; j++ {
 				r.Hl[j] = highlight.Comment
 			}
 			break
 		}
 
+		// Multiline comments
+		if hasMcs && hasMce && inString == '0' {
+			if inComment {
+				r.Hl[i] = highlight.MLComment
+				// We found the end of the multiline comment
+				if mceIndex == i {
+					for j := i; j < (i + len(mce)); j++ {
+						r.Hl[j] = highlight.MLComment
+					}
+					i += len(mce)
+					inComment = false
+					prevSep = true
+					continue
+				}
+
+				i++
+				continue
+			}
+
+			// Found the start of the multiline comment
+			if mcsIndex == i {
+				for j := i; j < (i + len(mce)); j++ {
+					r.Hl[j] = highlight.MLComment
+				}
+				i += len(mcs)
+				inComment = true
+				continue
+			}
+		}
+
 		// String literals
 		if s.Flags&highlight.DoStrings == highlight.DoStrings {
 			// At the start of a string literal

editor/highlight/highlight.go

@@ -11,6 +11,7 @@ import (
 const (
 	Normal = iota
 	Comment
+	MLComment
 	Keyword1
 	Keyword2
 	String
@@ -29,6 +30,7 @@ const (
 
 var syntaxColorMap = map[int]string{
 	Comment:   terminal.FGCyan,
+	MLComment: terminal.FGBrightCyan,
 	Keyword1:  terminal.FGYellow,
 	Keyword2:  terminal.FGGreen,
 	String:    terminal.FGBrightMagenta,
@@ -56,6 +58,8 @@ type Syntax struct {
 	FileType              string
 	FileMatch             []string
 	LineCommentStart      string
+	MultilineCommentStart string
+	MultilineCommentEnd   string
 	Keywords1             []string
 	Keywords2             []string
 	Flags                 int
@@ -66,20 +70,44 @@ var HLDB = []*Syntax{{
 	"c",
 	[]string{".c", ".h", ".cpp"},
 	"//",
-	[]string{"switch", "if", "while", "for", "break", "continue", "return", "else", "struct", "union", "typedef", "static", "enum", "class", "case"},
-	[]string{"int", "long", "double", "float", "char", "unsigned", "signed", "void"},
+	"/*",
+	"*/",
+	[]string{
+		"switch", "if", "while", "for", "break", "continue", "return",
+		"else", "struct", "union", "typedef", "static", "enum",
+		"class", "case",
+	},
+	[]string{"int",
+		"long", "double", "float", "char", "unsigned", "signed", "void",
+		"#define", "#endif", "#error", "#if", "#ifdef", "#ifndef", "#include",
+		"#undef",
+	},
 	DoNumbers | DoStrings,
 }, {
 	"go",
 	[]string{".go", "go.mod"},
 	"//",
-	[]string{"break", "case", "chan", "const", "continue", "default", "defer", "else", "fallthrough", "for", "func", "go", "goto", "if", "import", "interface", "map", "package", "range", "return", "select", "struct", "switch", "type", "var", "iota"},
-	[]string{"bool", "uint8", "uint16", "uint32", "uint64", "int8", "int16", "int32", "int64", "float32", "float64", "complex64", "complex128", "byte", "rune", "uint", "int", "uintptr", "string", "struct", "type", "map"},
+	"/*",
+	"*/",
+	[]string{
+		"break", "case", "chan", "const", "continue", "default", "defer",
+		"else", "fallthrough", "for", "func", "go", "goto", "if",
+		"import", "interface", "map", "package", "range", "return", "select",
+		"struct", "switch", "type", "var", "iota",
+	},
+	[]string{
+		"bool", "uint8", "uint16", "uint32", "uint64", "int8", "int16",
+		"int32", "int64", "float32", "float64", "complex64", "complex128",
+		"byte", "rune", "uint", "int", "uintptr", "string",
+		"struct", "type", "map",
+	},
 	DoNumbers | DoStrings,
 }, {
 	"makefile",
 	[]string{"Makefile", "makefile", "justfile"},
 	"#",
+	"",
+	"",
 	[]string{},
 	[]string{},
 	0,