123 lines
3.1 KiB
Go
123 lines
3.1 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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import "git.tebibyte.media/arf/arf/infoerr"
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// parseEnumSection parses an enumerated type section.
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func (parser *ParsingOperation) parseEnumSection () (
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section EnumSection,
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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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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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// parse members
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err = parser.parseEnumMembers(§ion)
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if err != nil { return }
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if len(section.members) == 0 {
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infoerr.NewError (
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section.location,
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"defining an enum with no members",
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infoerr.ErrorKindWarn).Print()
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}
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return
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}
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// parseEnumMembers parses a list of members for an enum section. Indentation
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// level is assumed.
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func (parser *ParsingOperation) parseEnumMembers (
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into *EnumSection,
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) (
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err error,
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) {
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for {
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// if we've left the block, stop parsing
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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.TokenKindMinus)
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if err != nil { return }
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var member EnumMember
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member, err = parser.parseEnumMember()
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into.members = append(into.members, member)
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if err != nil { return }
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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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}
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}
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// parseEnumMember parses a single enum member. Indenttion level is assumed.
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func (parser *ParsingOperation) parseEnumMember () (
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member EnumMember,
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err error,
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) {
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err = parser.expect(lexer.TokenKindMinus)
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if err != nil { return }
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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.location = parser.token.Location()
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member.name = parser.token.Value().(string)
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// see if value exists
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err = parser.nextToken (
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lexer.TokenKindColon,
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lexer.TokenKindNewline)
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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()
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if err != nil { return }
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err = parser.skipWhitespace()
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if err != nil { return }
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err = parser.expect (
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lexer.TokenKindLessThan,
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lexer.TokenKindGreaterThan)
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindLessThan) {
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// parse value
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member.value, 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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// parse default values
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member.value, err = parser.parseObjectDefaultValue()
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if err != nil { return }
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}
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}
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return
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}
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