Function partitionLineEndTokens

hclwrite/parser.go:603–631

partitionLineEndTokens takes a sequence of tokens that is assumed to immediately follow a construct that can have a line comment, and returns first the index where any line comments end and then second the index immediately after the trailing newline. Line comments are defined as comments that appe

(toks hclsyntax.Tokens)

// terminates them, in the presence of these the two returned indices
// will be the same since the comment itself serves as the line end.
func partitionLineEndTokens(toks hclsyntax.Tokens) (afterComment, afterNewline int) {
	for i := 0; i < len(toks); i++ {
		tok := toks[i]
		if tok.Type != hclsyntax.TokenComment {
			switch tok.Type {
			case hclsyntax.TokenNewline:
				return i, i + 1
			case hclsyntax.TokenEOF:
				// Although this is valid, we mustn't include the EOF
				// itself as our "newline" or else strange things will
				// happen when we try to append new items.
				return i, i
			default:
				// If we have well-formed input here then nothing else should be
				// possible. This path should never happen, because we only try
				// to extract tokens from the sequence if the parser succeeded,
				// and it should catch this problem itself.
				panic("malformed line trailers: expected only comments and newlines")
			}
		}

		if len(tok.Bytes) > 0 && tok.Bytes[len(tok.Bytes)-1] == '\n' {
			// Newline at the end of a single-line comment serves both as
			// the end of comments *and* the end of the line.
			return i + 1, i + 1
		}
	}
	return len(toks), len(toks)
}

// lexConfig uses the hclsyntax scanner to get a token stream and then
// rewrites it into this package's token model.