146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
package parser
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import "git.tebibyte.media/arf/arf/lexer"
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import "git.tebibyte.media/arf/arf/infoerr"
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// parseType parses a type notation of the form Name, {Name}, etc.
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func (parser *ParsingOperation) parseType () (what Type, err error) {
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err = parser.expect(lexer.TokenKindName, lexer.TokenKindLBrace)
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if err != nil { return }
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what.location = parser.token.Location()
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if parser.token.Is(lexer.TokenKindLBrace) {
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what.kind = TypeKindPointer
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err = parser.nextToken()
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if err != nil { return }
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var points Type
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points, err = parser.parseType()
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if err != nil { return }
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what.points = &points
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err = parser.expect (
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lexer.TokenKindRBrace,
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lexer.TokenKindElipsis)
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindElipsis) {
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what.kind = TypeKindVariableArray
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err = parser.nextToken(lexer.TokenKindRBrace)
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if err != nil { return }
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}
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err = parser.nextToken()
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if err != nil { return }
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} else {
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what.name, err = parser.parseIdentifier()
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if err != nil { return }
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}
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for {
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if !parser.token.Is(lexer.TokenKindColon) { break }
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err = parser.nextToken(lexer.TokenKindName, lexer.TokenKindUInt)
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindName) {
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// parse type qualifier
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qualifier := parser.token.Value().(string)
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switch qualifier {
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case "mut":
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what.mutable = true
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default:
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err = parser.token.NewError (
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"unknown type qualifier \"" +
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qualifier + "\"",
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infoerr.ErrorKindError)
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return
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}
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} else {
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// parse fixed array length
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what.length = parser.token.Value().(uint64)
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}
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err = parser.nextToken()
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if err != nil { return }
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}
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// TODO: consider offloading array default values to argument parsing, and
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// then just grabbing the next argument after this if it exists. that way
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// we can have array litreals anywhere.
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// get default value
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if parser.token.Is(lexer.TokenKindLessThan) {
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what.defaultValue, err = parser.parseBasicDefaultValue()
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if err != nil { return }
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} else if parser.token.Is(lexer.TokenKindLParen) {
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// TODO: parse members and member default values
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}
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return
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}
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// parseBasicDefaultValue parses a default value of a non-object type.
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func (parser *ParsingOperation) parseBasicDefaultValue () (
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value Argument,
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err error,
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) {
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err = parser.expect(lexer.TokenKindLessThan)
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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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var arguments []Argument
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defer func () {
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// if we have multiple values, we need to return the full array
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// instead.
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if len(arguments) > 1 {
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// FIXME: i think this is a sign that the tree needs
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// cleaning up.
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value.kind = ArgumentKindArrayDefaultValues
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location := value.location
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value.value = ArrayDefaultValues {
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values: arguments,
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}
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value.location = location
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}
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} ()
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for {
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if parser.token.Is(lexer.TokenKindIndent) { continue }
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if parser.token.Is(lexer.TokenKindNewline) { continue }
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if parser.token.Is(lexer.TokenKindGreaterThan) { break }
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value, err = parser.parseArgument()
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if err != nil { return }
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arguments = append(arguments, value)
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}
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return
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}
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// parseObjectDefaultValue parses default values and new members of an object
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// type.
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func (parser *ParsingOperation) parseObjectDefaultValue () (
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value Argument,
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members []TypeMember,
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err error,
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) {
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err = parser.expect(lexer.TokenKindLParen)
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if err != nil { return }
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parser.nextToken()
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if err != nil { return }
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for {
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err = parser.expect(lexer.TokenKindDot)
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if err != nil { return }
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parser.nextToken()
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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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