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arf/parser/type-notation.go

310 lines
7.7 KiB
Go

package parser
import "git.tebibyte.media/arf/arf/lexer"
import "git.tebibyte.media/arf/arf/infoerr"
import "git.tebibyte.media/arf/arf/types"
// parseType parses a type notation of the form Name, {Name}, etc.
func (parser *ParsingOperation) parseType () (what Type, err error) {
err = parser.expect(lexer.TokenKindName, lexer.TokenKindLBrace)
if err != nil { return }
what.location = parser.token.Location()
if parser.token.Is(lexer.TokenKindLBrace) {
what.kind = TypeKindPointer
err = parser.nextToken()
if err != nil { return }
var points Type
points, err = parser.parseType()
if err != nil { return }
what.points = &points
err = parser.expect (
lexer.TokenKindRBrace,
lexer.TokenKindElipsis)
if err != nil { return }
if parser.token.Is(lexer.TokenKindElipsis) {
what.kind = TypeKindVariableArray
err = parser.nextToken(lexer.TokenKindRBrace)
if err != nil { return }
}
err = parser.nextToken()
if err != nil { return }
} else {
what.name, err = parser.parseIdentifier()
if err != nil { return }
}
for {
if !parser.token.Is(lexer.TokenKindColon) { break }
err = parser.nextToken()
if err != nil { return }
err = parser.skipWhitespace()
if err != nil { return }
err = parser.expect(
lexer.TokenKindName,
lexer.TokenKindUInt,
lexer.TokenKindLParen,
lexer.TokenKindLessThan)
if err != nil { return }
if parser.token.Is(lexer.TokenKindName) {
// parse type qualifier
qualifier := parser.token.Value().(string)
switch qualifier {
case "mut":
what.mutable = true
default:
err = parser.token.NewError (
"unknown type qualifier \"" +
qualifier + "\"",
infoerr.ErrorKindError)
return
}
} else if parser.token.Is(lexer.TokenKindUInt) {
// parse fixed array length
what.length = parser.token.Value().(uint64)
} else if parser.token.Is(lexer.TokenKindLessThan) {
// parse default value
what.defaultValue, err = parser.parseBasicDefaultValue()
if err != nil { return }
} else if parser.token.Is(lexer.TokenKindLParen) {
// parse members and member default values
what.defaultValue,
what.members,
err = parser.parseObjectDefaultValueAndMembers()
if err != nil { return }
}
err = parser.nextToken()
if err != nil { return }
}
return
}
// parseBasicDefaultValue parses a default value of a non-object type.
func (parser *ParsingOperation) parseBasicDefaultValue () (
value Argument,
err error,
) {
value.location = parser.token.Location()
err = parser.expect(lexer.TokenKindLessThan)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
var attributes []Argument
defer func () {
// if we have multiple values, we need to return the full array
// instead.
if len(attributes) > 1 {
value.kind = ArgumentKindArrayDefaultValues
value.value = ArrayDefaultValues(attributes)
}
} ()
for {
err = parser.skipWhitespace()
if err != nil { return }
if parser.token.Is(lexer.TokenKindGreaterThan) { break }
value, err = parser.parseArgument()
if err != nil { return }
attributes = append(attributes, value)
}
return
}
// parseObjectDefaultValueAndMembers parses default values and new members of an
// object type.
func (parser *ParsingOperation) parseObjectDefaultValueAndMembers () (
value Argument,
members []TypeMember,
err error,
) {
value.location = parser.token.Location()
err = parser.expect(lexer.TokenKindLParen)
if err != nil { return }
parser.nextToken()
if err != nil { return }
var attributes ObjectDefaultValues
for {
err = parser.skipWhitespace()
if err != nil { return }
if parser.token.Is(lexer.TokenKindRParen) { break }
err = parser.expect(lexer.TokenKindDot)
if err != nil { return }
parser.nextToken(lexer.TokenKindName, lexer.TokenKindPermission)
if err != nil { return }
if parser.token.Is(lexer.TokenKindName) {
// parsing a defalut value for an inherited member
var memberName string
var memberValue Argument
memberName,
memberValue, err = parser.parseObjectInheritedMember()
if err != nil { return }
if value.kind == ArgumentKindNil {
// create default value map if it doesn't
// already exist
value.kind = ArgumentKindObjectDefaultValues
attributes = make(ObjectDefaultValues)
value.value = attributes
}
// TODO: error on duplicate
if memberValue.kind != ArgumentKindNil {
attributes[memberName] = memberValue
}
} else if parser.token.Is(lexer.TokenKindPermission) {
// parsing a member declaration
var member TypeMember
member,
err = parser.parseObjectNewMember()
// TODO: error on duplicate
members = append(members, member)
}
}
return
}
// parseObjectDefaultValue parses member default values only, and will throw an
// error when it encounteres a new member definition.
func (parser *ParsingOperation) parseObjectDefaultValue () (
value Argument,
err error,
) {
value.location = parser.token.Location()
err = parser.expect(lexer.TokenKindLParen)
if err != nil { return }
parser.nextToken()
if err != nil { return }
var attributes ObjectDefaultValues
for {
err = parser.skipWhitespace()
if err != nil { return }
if parser.token.Is(lexer.TokenKindRParen) { break }
err = parser.expect(lexer.TokenKindDot)
if err != nil { return }
parser.nextToken(lexer.TokenKindName)
if err != nil { return }
if value.kind == ArgumentKindNil {
value.kind = ArgumentKindObjectDefaultValues
attributes = make(ObjectDefaultValues)
value.value = attributes
}
var memberName string
var memberValue Argument
memberName,
memberValue, err = parser.parseObjectInheritedMember()
attributes[memberName] = memberValue
}
return
}
// .name:<value>
// parseObjectInheritedMember parses a new default value for an inherited
// member.
func (parser *ParsingOperation) parseObjectInheritedMember () (
name string,
value Argument,
err error,
) {
// get the name of the inherited member
err = parser.expect(lexer.TokenKindName)
value.location = parser.token.Location()
if err != nil { return }
name = parser.token.Value().(string)
// we require a default value to be present
err = parser.nextToken(lexer.TokenKindColon)
if err != nil { return }
err = parser.nextToken(lexer.TokenKindLParen, lexer.TokenKindLessThan)
if err != nil { return }
if parser.token.Is(lexer.TokenKindLessThan) {
// parse default value
value, err = parser.parseBasicDefaultValue()
if err != nil { return }
} else if parser.token.Is(lexer.TokenKindLParen) {
// parse member default values
value, err = parser.parseObjectDefaultValue()
if err != nil { return }
}
err = parser.nextToken()
if err != nil { return }
return
}
// .ro name:Type:qualifier:<value>
// parseObjectNewMember parses an object member declaration, and its
// default value if it exists.
func (parser *ParsingOperation) parseObjectNewMember () (
member TypeMember,
err error,
) {
// get member permission
err = parser.expect(lexer.TokenKindPermission)
member.location = parser.token.Location()
if err != nil { return }
member.permission = parser.token.Value().(types.Permission)
// get member name
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
member.name = parser.token.Value().(string)
// get type
err = parser.nextToken(lexer.TokenKindColon)
if err != nil { return }
err = parser.nextToken(lexer.TokenKindName, lexer.TokenKindLBrace)
if err != nil { return }
member.what, err = parser.parseType()
if err != nil { return }
// TODO: get bit width
if parser.token.Is(lexer.TokenKindBinaryAnd) {
err = parser.nextToken(lexer.TokenKindUInt)
if err != nil { return }
member.bitWidth = parser.token.Value().(uint64)
err = parser.nextToken()
if err != nil { return }
}
return
}