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Support multiple comment symbols #766

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zeehio commented Dec 17, 2017

This pull request allows to provide more than one comment pattern to readr. Example:

  "# A comment",
  "// another comment",
  "3,4"), delim = ",", comment = c("#", "//"))

It is applied on top of this other PR #677, so merging this will be easier once that PR is reviewed.

zeehio added some commits Dec 17, 2017

Provide encoding to datasource()
If this encoding is ambiguous in endianness (like UTF-16 or UTF-32 which mandate
a Byte Order Mark) the BOM is detected and skipped (as before) and the encoding
is updated to reflect the endianness (UTF-16LE, UTF16-BE...)
Allow multiple comment patterns
This commit allows users to define multiple comments using a character vector.

Additionally, comment detection is now handled exclusively by the datasource, before it was splitted between both the datasource and the tokenizer.

The `comment` argument in the tokenizer functions is deprecated and will be removed in future versions.

@zeehio zeehio force-pushed the zeehio:multiple_comment_prefixes branch from 828d243 to b5760c3 Dec 17, 2017

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