Parse basic information about data sections (name, type)

This commit is contained in:
Sasha Koshka 2022-08-16 10:44:02 -04:00
parent ac40fa96e5
commit f978621673
2 changed files with 105 additions and 3 deletions

View File

@ -1,9 +1,111 @@
package parser
// parseData parses a data section
import "git.tebibyte.media/sashakoshka/arf/file"
import "git.tebibyte.media/sashakoshka/arf/types"
import "git.tebibyte.media/sashakoshka/arf/lexer"
// parseData parses a data section.
func (parser *ParsingOperation) parseDataSection () (
section *DataSection,
err error,
) {
err = parser.expect(lexer.TokenKindName)
if err != nil { return }
section = &DataSection { location: parser.token.Location() }
err = parser.nextToken(lexer.TokenKindPermission)
if err != nil { return }
section.permission = parser.token.Value().(types.Permission)
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
section.name = parser.token.Value().(string)
err = parser.nextToken(lexer.TokenKindColon)
if err != nil { return }
section.what, err = parser.parseType()
if err != nil { return }
return
}
// parseType parses a type notation of the form Name, {Name}, etc.
func (parser *ParsingOperation) parseType () (what Type, err error) {
err = parser.nextToken(lexer.TokenKindName, lexer.TokenKindLBrace)
if err != nil { return }
what.location = parser.token.Location()
if parser.token.Is(lexer.TokenKindLBrace) {
what.kind = TypeKindPointer
var points Type
points, err = parser.parseType()
if err != nil { return }
what.points = &points
err = parser.nextToken (
lexer.TokenKindUInt,
lexer.TokenKindRBrace)
if err != nil { return }
if parser.token.Is(lexer.TokenKindUInt) {
what.kind = TypeKindArray
what.length = parser.token.Value().(uint64)
err = parser.nextToken (
lexer.TokenKindUInt,
lexer.TokenKindRBrace)
if err != nil { return }
}
} else {
what.name, err = parser.parseIdentifier()
if err != nil { return }
}
err = parser.nextToken()
if parser.token.Is(lexer.TokenKindColon) {
err = parser.nextToken(lexer.TokenKindName)
if err != nil { return }
qualifier := parser.token.Value().(string)
switch qualifier {
case "mut":
what.mutable = true
default:
err = parser.token.NewError (
"unknown type qualifier \"" + qualifier + "\"",
file.ErrorKindError)
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 }
}
return
}

View File

@ -42,9 +42,9 @@ type Type struct {
mutable bool
kind TypeKind
// only applicable for arrays. a value of nil means it has an
// only applicable for arrays. a value of zero means it has an
// undefined/dynamic length.
length *Argument
length uint64
// only applicable for basic.
name Identifier