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arf/parser/misc.go

109 lines
2.5 KiB
Go

package parser
import "git.tebibyte.media/arf/arf/lexer"
import "git.tebibyte.media/arf/arf/infoerr"
// 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(lexer.TokenKindName, lexer.TokenKindUInt)
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 {
// parse fixed array length
what.length = parser.token.Value().(uint64)
}
err = parser.nextToken()
if err != nil { return }
}
return
}
// parseIdentifier parses an identifier made out of dot separated names.
func (parser *ParsingOperation) parseIdentifier () (
identifier Identifier,
err error,
) {
err = parser.expect(lexer.TokenKindName)
if err != nil { return }
identifier.location = parser.token.Location()
for {
if !parser.token.Is(lexer.TokenKindName) { break }
identifier.trail = append (
identifier.trail,
parser.token.Value().(string))
err = parser.nextToken()
if err != nil { return }
if !parser.token.Is(lexer.TokenKindDot) { break }
err = parser.nextToken()
if err != nil { return }
// allow the identifier to continue on to the next line if there
// is a line break right after the dot
for parser.token.Is(lexer.TokenKindNewline) ||
parser.token.Is(lexer.TokenKindIndent) {
err = parser.nextToken()
if err != nil { return }
}
}
return
}