Basic parser for inline tables

parser.go

@@ -244,6 +244,8 @@ func (p *tomlParser) parseRvalue() interface{} {
 		return val
 	case tokenLeftBracket:
 		return p.parseArray()
+	case tokenLeftCurlyBrace:
+		return p.parseInlineTable()
 	case tokenError:
 		p.raiseError(tok, "%s", tok)
 	}
@@ -253,6 +255,56 @@ func (p *tomlParser) parseRvalue() interface{} {
 	return nil
 }
 
+func tokenIsComma(t *token) bool {
+	return t != nil && t.typ == tokenComma
+}
+
+func (p *tomlParser) parseInlineTable() *TomlTree {
+	println("parsing inline table")
+	tree := newTomlTree()
+	var previous *token
+Loop:
+	for {
+		follow := p.peek()
+		if follow == nil || follow.typ == tokenEOF {
+			p.raiseError(follow, "unterminated inline table")
+		}
+		println("token type:", follow.typ.String())
+		switch follow.typ {
+		case tokenRightCurlyBrace:
+			p.getToken()
+			break Loop
+		case tokenKey:
+			if !tokenIsComma(previous) && previous != nil {
+				p.raiseError(follow, "comma expected between fields in inline table")
+			}
+			key := p.getToken()
+			p.assume(tokenEqual)
+			value := p.parseRvalue()
+			println("got key:", key.val)
+			println("got rvalue:", value)
+			println("got rvalue type:", reflect.TypeOf(value))
+			tree.Set(key.val, value)
+		case tokenComma:
+			if previous == nil {
+				p.raiseError(follow, "inline table cannot start with a comma")
+			}
+			if tokenIsComma(previous) {
+				p.raiseError(follow, "need field between two commas in inline table")
+			}
+			p.getToken()
+		default:
+			p.raiseError(follow, "unexpected token type in inline table: %s", follow.typ.String())
+		}
+		println("assigning previous to follow")
+		previous = follow
+	}
+	if tokenIsComma(previous) {
+		p.raiseError(previous, "trailing comma at the end of inline table")
+	}
+	return tree
+}
+
 func (p *tomlParser) parseArray() []interface{} {
 	var array []interface{}
 	arrayType := reflect.TypeOf(nil)

parser_test.go

@@ -310,6 +310,40 @@ func TestArrayWithExtraCommaComment(t *testing.T) {
 	})
 }
 
+func TestSimpleInlineGroup(t *testing.T) {
+	tree, err := Load("key = {a = 42}")
+	assertTree(t, tree, err, map[string]interface{}{
+		"key": map[string]interface{}{
+			"a": int64(42),
+		},
+	})
+}
+
+func TestDoubleInlineGroup(t *testing.T) {
+	tree, err := Load("key = {a = 42, b = \"foo\"}")
+	assertTree(t, tree, err, map[string]interface{}{
+		"key": map[string]interface{}{
+			"a": int64(42),
+			"b": "foo",
+		},
+	})
+}
+
+func TestExampleInlineGroup(t *testing.T) {
+	tree, err := Load(`name = { first = "Tom", last = "Preston-Werner" }
+point = { x = 1, y = 2 }`)
+	assertTree(t, tree, err, map[string]interface{}{
+		"name": map[string]interface{}{
+			"first": "Tom",
+			"last":  "Preston-Werner",
+		},
+		"point": map[string]interface{}{
+			"x": int64(1),
+			"y": int64(2),
+		},
+	})
+}
+
 func TestDuplicateGroups(t *testing.T) {
 	_, err := Load("[foo]\na=2\n[foo]b=3")
 	if err.Error() != "(3, 2): duplicated tables" {