// ENUM_BODY -> [ ENUN_VALUE {, ENUM_VALUE} [,] ]
// ENUM_VALUE -> [ATTRIBUTES] name [equals ENUM_VAL_INITIALIZER]
func (p *Parser) parseEnumBody(mojomEnum *mojom.MojomEnum) bool {
if !p.OK() {
return p.OK()
}
p.pushChildNode("enumBody")
defer p.popNode()
// The enum body forms a new scope in which it's enun values are defined.
p.pushScope(mojomEnum.InitAsScope(p.currentScope))
defer p.popScope()
rbraceFound := false
trailingCommaFound := false
firstValue := true
for attributes := p.parseAttributes(); !rbraceFound; attributes = p.parseAttributes() {
if !p.OK() {
return false
}
nextToken := p.peekNextToken("I was parsing an enum body.")
var duplicateNameError error = nil
switch nextToken.Kind {
case lexer.Name:
if !firstValue && !trailingCommaFound {
message := fmt.Sprintf("Expecting a comma after %s before "+
"the next value %s at %s. ", p.lastConsumed, nextToken,
nextToken.LongLocationString())
p.err = &ParseError{ParserErrorCodeUnexpectedToken, message}
return false
}
firstValue = false
name := p.readName()
p.attachToken()
nameToken := p.lastConsumed
var valueRef mojom.ValueRef
if p.tryMatch(lexer.Equals) {
valueRef = p.parseEnumValueInitializer(mojomEnum)
}
declData := p.DeclData(name, nameToken, attributes)
duplicateNameError = mojomEnum.AddEnumValue(declData, valueRef)
trailingCommaFound = p.tryMatch(lexer.Comma)
case lexer.RBrace:
rbraceFound = true
if attributes != nil {
message := "Enum body ends with extraneouss attributes."
p.err = &ParseError{ParserErrorCodeBadAttributeLocation, message}
}
break
case lexer.Comma:
break
default:
p.unexpectedTokenError(nextToken, "either another enum value or }")
return false
}
if p.OK() && duplicateNameError != nil {
p.err = &ParseError{ParserErrorCodeDuplicateDeclaration, duplicateNameError.Error()}
return false
}
}
return p.OK()
}
// ENUM_VAL_INITIALIZER -> INTEGER_LITERAL | ENUM_VALUE_REF
// ENUM_VALUE_REF -> IDENTIFIER {{that resolves to a declared enum value}}
func (p *Parser) parseEnumValueInitializer(mojoEnum *mojom.MojomEnum) mojom.ValueRef {
if !p.OK() {
return nil
}
p.pushChildNode("enumValueInitializer")
defer p.popNode()
// We need to manufacture an instance of Type to act as the "assigneeType"
// for the new ValueSpec we are creating. This is because unlike
// other types of value assignment, an enum value initializer is not
// preceded by a type reference for the assignee. Rather the type of
// the assignee is implicit in the scope.
enumType := mojom.NewResolvedUserTypeRef(mojoEnum.FullyQualifiedName(), mojoEnum)
valueToken := p.peekNextToken("Parsing an enum value initializer type.")
valueRef := p.parseValue(enumType)
if valueRef == nil {
return nil
}
if !valueRef.MarkUsedAsEnumValueInitializer() {
message := fmt.Sprintf("Illegal value: %s at %s. An enum value may "+
"only be initialized by an integer or another enum value.", valueToken,
valueToken.LongLocationString())
p.err = &ParseError{ParserErrorCodeUnexpectedToken, message}
return nil
}
return valueRef
}
// ENUM_BODY -> [ ENUN_VALUE {, ENUM_VALUE} [,] ]
// ENUM_VALUE -> [ATTRIBUTES] name [equals ENUM_VAL_INITIALIZER]
func (p *Parser) parseEnumBody(mojomEnum *mojom.MojomEnum) bool {
if !p.OK() {
return p.OK()
}
p.pushChildNode("enumBody")
defer p.popNode()
// The enum body forms a new scope in which it's enun values are defined.
p.pushScope(mojomEnum.InitAsScope(p.currentScope))
defer p.popScope()
rbraceFound := false
trailingCommaFound := false
firstValue := true
for attributes := p.parseAttributes(); !rbraceFound; attributes = p.parseAttributes() {
if !p.OK() {
return false
}
nextToken := p.peekNextToken("I was parsing an enum body.")
dupeMessage := ""
switch nextToken.Kind {
case lexer.NAME:
if !firstValue && !trailingCommaFound {
message := fmt.Sprintf("Expecting a comma after %s before "+
"the next value %s at %s. ", p.lastConsumed, nextToken,
nextToken.LongLocationString())
p.err = &ParseError{E_UNEXPECTED_TOKEN, message}
return false
}
firstValue = false
name := p.readName()
p.attachToken()
nameToken := p.lastConsumed
var valueRef mojom.ValueRef
if p.tryMatch(lexer.EQUALS) {
valueRef = p.parseEnumValueInitializer(mojomEnum)
}
dupeMessage = p.duplicateNameMessage(
mojomEnum.AddEnumValue(name, valueRef, attributes), nameToken)
trailingCommaFound = p.tryMatch(lexer.COMMA)
case lexer.RBRACE:
rbraceFound = true
if attributes != nil {
message := "Enum body ends with extranesous attributes."
p.err = &ParseError{E_BAD_ATTRIBUTE_LOCATION, message}
}
break
case lexer.COMMA:
break
default:
p.unexpectedTokenError(nextToken, "either another enum value or }")
return false
}
if p.OK() && len(dupeMessage) > 0 {
p.err = &ParseError{E_DUPLICATE_DECLARATION, dupeMessage}
return false
}
}
if p.OK() {
mojomEnum.ComputeEnumValues()
}
return p.OK()
}