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arf/parser/type.go

136 lines
3.6 KiB
Go

package parser
import "git.tebibyte.media/arf/arf/types"
import "git.tebibyte.media/arf/arf/lexer"
// parseTypeSection parses a type definition. It can inherit from other types,
// and define new members on them.
func (parser *parsingOperation) parseTypeSection () (
section TypeSection,
err error,
) {
err = parser.expect(lexer.TokenKindName)
if err != nil { return }
section.location = parser.token.Location()
// get permission
err = parser.nextToken(lexer.TokenKindPermission)
if err != nil { return }
section.permission = parser.token.Value().(types.Permission)
// get name
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
section.name = parser.token.Value().(string)
// parse inherited type
err = parser.nextToken(lexer.TokenKindColon)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
section.what, err = parser.parseType()
if err != nil { return }
// see if value exists
if parser.token.Is(lexer.TokenKindNewline) {
err = parser.nextToken()
if err != nil { return }
// if we have exited the section, return
if !parser.token.Is(lexer.TokenKindIndent) { return }
if parser.token.Value().(int) != 1 { return }
err = parser.nextToken()
if err != nil { return }
}
// if we have not encountered members, get value and return.
if !parser.token.Is(lexer.TokenKindPermission) {
section.argument, err = parser.parseArgument()
err = parser.expect(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
return
}
parser.previousToken()
for {
// if we have exited the section, return
if !parser.token.Is(lexer.TokenKindIndent) { return }
if parser.token.Value().(int) != 1 { return }
err = parser.nextToken(lexer.TokenKindPermission)
if err != nil { return }
var member TypeSectionMember
member, err = parser.parseTypeSectionMember()
section.members = append(section.members, member)
if err != nil { return }
}
}
// parseTypeSectionMember parses a type section member variable.
func (parser *parsingOperation) parseTypeSectionMember () (
member TypeSectionMember,
err error,
) {
// get permission
err = parser.expect(lexer.TokenKindPermission)
if err != nil { return }
member.permission = parser.token.Value().(types.Permission)
member.location = parser.token.Location()
// get name
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
member.name = parser.token.Value().(string)
// if there is a type, get it
err = parser.nextToken()
if err != nil { return }
if parser.token.Is(lexer.TokenKindColon) {
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
member.what, err = parser.parseType()
if err != nil { return }
}
// see if value exists
if parser.token.Is(lexer.TokenKindNewline) {
parser.nextToken()
// if we have exited the member, return
if !parser.token.Is(lexer.TokenKindIndent) { return }
if parser.token.Value().(int) != 2 { return }
err = parser.nextToken()
if err != nil { return }
}
// if default value exists, get it
if !parser.token.Is(lexer.TokenKindBinaryAnd) {
member.argument, err = parser.parseArgument()
}
// if there is a bit width specifier, get it
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 }
}
err = parser.expect(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
return
}