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There is a character ä (0圎4) that can be represented at least in two ways in Unicode: U+00C4 (ä) or U+0061 (a) U+0308 (¨ - combining diaeresis). Let's say for example we have file encoded in iso-8859-1 and we use the same encoding for JSON-RPC communication. So why would it be better to use Unicode codepoints instead of bytes? Of the client implementations of ycmd (there are about 8 I think), all of them are able to provide line-byte offsets. My thought process is that if there is a file in different encoding than any utf, and we use other encoding than utf in JSON-RCP (which can happen in future) then why would there be any need for the client and server to know what Unicode is at all? I am sorry in advance if I am telling something stupid right now.

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I don't know for certain all of them, but certainly the main one ( Vim) is not able to provide utf 16 code units they would have to be calculated.Īnyway, the point is that it might not be as simple as originally thought :D Though I appreciate that a specification is such, and changing it would be breaking. However, as we receive byte offsets from the client, and internally use unicode code points, we have to reencode the file as utf 16, do a bunch of hackery to count the code units, then send the file, encoded as utf8 over to the language server, with offsets in utf 16 code units. The last is a bit of a fib, because we're integrating Language Server API for java.

WINDOWS TYPING UTF CODEPOINTS FULL

* full disclosure, I think these use code points, else we have a bug!

6 use unicode code points (gocode, tern, tsserver*, jedi, racer, omnisharp*).

Of the 7 downstream language completers we support in ycmd: To save one encoding pass we could transfer the JSON-RPC message in UTF-16 instead which is easy to support. We choose UTF-16 encoding here since most language store strings in memory in UTF-16 not UTF-8. We decided to let the server do this since the server very likely has read the file before anyways. So the client would need to read the content of the file and convert the offset in line / column. However the protocol was design to support tools and their UI a for example a reference match in a file could not be rendered using byte offsets in a list. Regarding byte offsets: there was another discussion whether the protocol should be offset based. If we want to support UTF-8 for internal text document representation and line offsets this would be a breaking change or needs to be a capability the client announces. The column offset in a document assumes that after the JSON-RPC message as been decoded when parsing the string document content needs to be stored in UTF-16 encoding. We currently use utf-8 here but as the header indicates this can be change to any encoding assuming that the encoding is supported in all libraries (for example node per default as only a limited set on encodings). See byte order, DBCS and emoji.We need to distinguish between the encoding used to transfer the JSON-RPC message. If non-ASCII characters require more than one byte, the high-order 1 bits of the byte define how many bytes are used. With UTF-8, if only ASCII text is required, a single byte is used per character with the high-order bit set to 0. The UTF-8 coding scheme is widely used because words from multiple languages and every type of symbol can be mixed together in the same message without having to reserve multiple bytes for every character as in UTF-16 or UTF-32. When combined with the byte order of the hardware (big endian or little endian), they are known officially as 'character encoding schemes.' They are also known by their UTF acronyms, which stand for 'Unicode Transformation Format' or 'Universal Character Set Transformation Format.' There are several formats for storing Unicode code points.

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Unicode supports more than a million code points, which are written with a 'U' followed by a plus sign and the number in hex for example, the word 'Hello' is written U+0048 U+0065 U+006C U+006C U+006F (see hex chart). The code point is a unique number for a character or some symbol such as an accent mark or ligature. Although commonly thought to be only a two-byte coding system, Unicode characters can use only one byte, or up to four bytes, to hold a Unicode 'code point' (see below).

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How to Set Up Two-Factor AuthenticationĪ character code that defines every character in most of the speaking languages in the world.

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Windows typing utf codepoints