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arf/parser/objt.go

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package parser
import "git.tebibyte.media/sashakoshka/arf/types"
import "git.tebibyte.media/sashakoshka/arf/lexer"
import "git.tebibyte.media/sashakoshka/arf/infoerr"
// parseObjtSection parses an object type definition. This allows for structured
// types to be defined, and for member variables to be added and overridden.
func (parser *ParsingOperation) parseObjtSection () (
section *ObjtSection,
err error,
) {
err = parser.expect(lexer.TokenKindName)
if err != nil { return }
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section = &ObjtSection {
location: parser.token.Location(),
members: make(map[string] ObjtMember),
}
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// 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.inherits, err = parser.parseType()
if err != nil { return }
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err = parser.expect(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
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if err != nil { return }
// parse members
err = parser.parseObjtMembers(section)
if err != nil { return }
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if len(section.members) == 0 {
infoerr.NewError (
section.location,
"defining an object with no members",
infoerr.ErrorKindWarn).Print()
}
return
}
// parseObjtMembers parses a list of members for an object section. Indentation
// level is assumed.
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func (parser *ParsingOperation) parseObjtMembers (
into *ObjtSection,
) (
err error,
) {
for {
// if we've left the block, stop parsing
if !parser.token.Is(lexer.TokenKindIndent) { return }
if parser.token.Value().(int) != 1 { return }
// add member to object section
var member ObjtMember
member, err = parser.parseObjtMember()
into.members[member.name] = member
if err != nil { return }
}
}
// parseObjtMember parses a single member of an object section. Indentation
// level is assumed.
func (parser *ParsingOperation) parseObjtMember () (
member ObjtMember,
err error,
) {
// get permission
err = parser.nextToken(lexer.TokenKindPermission)
if err != nil { return }
member.permission = parser.token.Value().(types.Permission)
// get name
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
member.name = parser.token.Value().(string)
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// get type
err = parser.nextToken(lexer.TokenKindColon)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
member.what, err = parser.parseType()
if err != nil { return }
// parse default value
if parser.token.Is(lexer.TokenKindNewline) {
err = parser.nextToken()
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if err != nil { return }
member.defaultValue,
err = parser.parseInitializationValues(1)
if err != nil { return }
} else {
member.defaultValue, err = parser.parseArgument()
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if err != nil { return }
err = parser.expect(lexer.TokenKindNewline)
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if err != nil { return }
err = parser.nextToken()
if err != nil { return }
}
return
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}