72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
package parser
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import "path/filepath"
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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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// parseMeta parsese the metadata header at the top of an arf file.
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func (parser *parsingOperation) parseMeta () (err error) {
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for {
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err = parser.expect (
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lexer.TokenKindName,
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lexer.TokenKindSeparator)
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if err != nil { return }
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if parser.token.Is(lexer.TokenKindSeparator) {
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err = parser.nextToken(lexer.TokenKindNewline)
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if err != nil { return }
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err = parser.nextToken()
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return
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}
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field := parser.token.Value().(string)
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err = parser.nextToken(lexer.TokenKindString)
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if err != nil { return }
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value := parser.token.Value().(string)
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switch field {
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case "author":
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parser.tree.author = value
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case "license":
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parser.tree.license = value
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case "require":
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// if import path is relative, get absolute path.
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if value[0] == '.' {
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value = filepath.Join(parser.modulePath, value)
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} else if value[0] != '/' {
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// TODO: get arf import path from an env
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// variable, and default to this if not found.
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// then, search all paths.
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value = filepath.Join (
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"/usr/local/include/arf/",
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value)
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}
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basename := filepath.Base(value)
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_, exists := parser.tree.requires[basename]
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if exists {
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err = parser.token.NewError (
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"cannot require \"" + basename +
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"\" multiple times",
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infoerr.ErrorKindError)
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return
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}
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parser.tree.requires[basename] = value
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default:
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parser.token.NewError (
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"unrecognized metadata field: " + field,
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infoerr.ErrorKindError)
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}
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err = parser.nextToken(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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