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arf/parser/enum.go

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2022-08-21 00:42:25 -06:00
package parser
import "git.tebibyte.media/sashakoshka/arf/types"
import "git.tebibyte.media/sashakoshka/arf/lexer"
import "git.tebibyte.media/sashakoshka/arf/infoerr"
func (parser *ParsingOperation) parseEnumSection () (
section *EnumSection,
err error,
) {
err = parser.expect(lexer.TokenKindName)
if err != nil { return }
section = &EnumSection {
location: parser.token.Location(),
members: make(map[string] Argument),
}
// 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 }
err = parser.expect(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
// parse members
err = parser.parseEnumMembers(section)
if err != nil { return }
if len(section.members) == 0 {
infoerr.NewError (
section.location,
"defining an enum with no members",
infoerr.ErrorKindWarn).Print()
}
return
}
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// parseEnumMembers parses a list of members for an enum section. Indentation
// level is assumed.
func (parser *ParsingOperation) parseEnumMembers (
into *EnumSection,
) (
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 }
// get name
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
name := parser.token.Value().(string)
err = parser.nextToken()
if err != nil { return }
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// parse default value
var argument Argument
if parser.token.Is(lexer.TokenKindNewline) {
err = parser.nextToken()
if err != nil { return }
argument, err = parser.parseInitializationValues(1)
into.members[name] = argument
if err != nil { return }
} else {
argument, err = parser.parseArgument()
into.members[name] = argument
if err != nil { return }
err = parser.expect(lexer.TokenKindNewline)
if err != nil { return }
err = parser.nextToken()
if err != nil { return }
}
}
}