135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
package parser
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import "git.tebibyte.media/arf/arf/types"
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import "git.tebibyte.media/arf/arf/lexer"
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// parseTypeSection parses a type definition. It can inherit from other types,
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// and define new members on them.
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func (parser *ParsingOperation) parseTypeSection () (
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section TypeSection,
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err error,
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) {
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err = parser.expect(lexer.TokenKindName)
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if err != nil { return }
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section.location = parser.token.Location()
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// get permission
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err = parser.nextToken(lexer.TokenKindPermission)
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if err != nil { return }
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section.permission = parser.token.Value().(types.Permission)
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// get name
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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section.name = parser.token.Value().(string)
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// parse inherited type
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err = parser.nextToken(lexer.TokenKindColon)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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section.what, err = parser.parseType()
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if err != nil { return }
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// see if value exists
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if parser.token.Is(lexer.TokenKindNewline) {
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parser.nextToken()
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// if we have exited the section, return
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if !parser.token.Is(lexer.TokenKindIndent) { return }
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if parser.token.Value().(int) != 1 { return }
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err = parser.nextToken()
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if err != nil { return }
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}
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// if we have not encountered members, get value and return.
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if !parser.token.Is(lexer.TokenKindPermission) {
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section.argument, err = parser.parseArgument()
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err = parser.expect(lexer.TokenKindNewline)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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return
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}
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parser.previousToken()
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for {
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// if we have exited the section, return
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if !parser.token.Is(lexer.TokenKindIndent) { return }
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if parser.token.Value().(int) != 1 { return }
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err = parser.nextToken(lexer.TokenKindPermission)
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if err != nil { return }
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var member TypeSectionMember
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member, err = parser.parseTypeSectionMember()
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section.members = append(section.members, member)
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if err != nil { return }
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}
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return
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}
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// parseTypeSectionMember parses a type section member variable.
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func (parser *ParsingOperation) parseTypeSectionMember () (
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member TypeSectionMember,
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err error,
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) {
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// get permission
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err = parser.expect(lexer.TokenKindPermission)
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if err != nil { return }
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member.permission = parser.token.Value().(types.Permission)
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// get name
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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member.name = parser.token.Value().(string)
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// if there is a type, get it
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err = parser.nextToken()
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindColon) {
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err = parser.nextToken(lexer.TokenKindName)
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if err != nil { return }
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member.what, err = parser.parseType()
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if err != nil { return }
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}
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// see if value exists
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if parser.token.Is(lexer.TokenKindNewline) {
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parser.nextToken()
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// if we have exited the member, return
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if !parser.token.Is(lexer.TokenKindIndent) { return }
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if parser.token.Value().(int) != 2 { return }
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err = parser.nextToken()
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if err != nil { return }
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}
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// if default value exists, get it
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if !parser.token.Is(lexer.TokenKindBinaryAnd) {
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member.argument, err = parser.parseArgument()
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}
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// if there is a bit width specifier, get it
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if parser.token.Is(lexer.TokenKindBinaryAnd) {
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err = parser.nextToken(lexer.TokenKindUInt)
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if err != nil { return }
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member.bitWidth = parser.token.Value().(uint64)
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err = parser.nextToken()
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if err != nil { return }
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}
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err = parser.expect(lexer.TokenKindNewline)
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if err != nil { return }
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err = parser.nextToken()
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if err != nil { return }
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return
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}
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