Category: Character code

EditorConfigとは？
-> インデントや文字コード、改行コードなどコーディングスタイルに関するエディタの設定を異なるエディタ間で共有する規格

laravel5.8のdefault EditorConfig

root = true

[*]
charset = utf-8
end_of_line = lf
insert_final_newline = true
indent_style = space
indent_size = 4
trim_trailing_whitespace = true

[*.md]
trim_trailing_whitespace = false

[*.yml]
indent_size = 2

indentは4になってますね。

sublimeのeditorConfig
https://github.com/sindresorhus/editorconfig-sublime#readme
-for support
root
indent_style
indent_size
end_of_line
charset
trim_trailing_whitespace
insert_final_newline

[shift]+[command]+[p]でinstall packageを選択

EditorConfigインストール

ドキュメントルートに.editorconfigのファイルを作成し、コーディングするとタグ等が自動整形される。
すげーーーーーーーー、採用!

There are two types of character code, Unicode, which has no BOM and with a BOM. BOM stands for byte order mark, which is a few bytes of data attached to the beginning of Unicode encoded text.

When the program reads text data, it determines from the first few bytes that it is Unicode data and which kind of encoding format is adopted. In the case of UTF-8 with BOM, the first 3 bytes are BOM, and the data is <0xEF 0xBB 0xBF>

Depending on the application such as Microsoft Excel, it may not be possible to determine whether the encoding method is UTF-8, UTF-16, UTF-32, or another different character code unless BOM is added. On the other hand, for HTML files used as web pages, it is better to save / overwrite without BOM. This is because some programs such as PHP that process web pages dynamically can not process text files with BOMs correctly. It can not generally be said that which way is better depending on the situation like this.

The difference between a file with BOM and a file without BOM is the presence or absence of the first 3 bytes, and the contents of other files and the character code (encoding system) are exactly the same. This means that if the encoding method is not correct, it will be displayed normally as a simple text file, so it can be said that it is difficult to notice that the BOM is the cause if the file malfunctions in any program.

ref:

Shift_JIS
Merit
-The number of bytes consumed is relatively small.
-Code that can be read on domestic mobile phones.

Demerit
It is garbled by how to use it.
Since encoded data often contains control characters, they may malfunction or be garbled in environments where they are not assumed.
The character type is about 9000.

UTF-8
The character range is wide and the characters of any contry can not be garbled.
It can be read by default in almost any PC environment.

When it comes to the beginning or end of a line, it is a character that is inappropriate in appearance or hard to read. Typical examples include punctuation marks and parentheses. There are two types of punctuation characters: line beginning and end line punctuation characters. The former refers to characters that are inconvenient to come to the beginning of the line, and the latter refers to characters that do not allow to come to the end of line.

終わり
括弧類：」』）｝】＞≫］など
拗促音：ぁぃぅぇぉっゃゅょァィゥェォッャュョなど
中点や音引：・（中点／中黒）ー（音引き）―（ダーシ）-（ハイフン）など
句読点：、。,.など
その他約物：ゝ々！？：；／など

始め
括弧類：「『（｛【＜≪［など

なるほどねー

An escape sequence is a special character string that controls character output, such as character color change, cursor movement, and character deletion, when outputting characters on the screen, rather than outputting the characters themselves.

In addition to the information that people can recognize as “character”, information other than “characters” such as control characters and character editing information on the OS is also included a s character information used in the OS. These characters are sometimes called “special characters”. An escape sequence exists for this special character to let people enter characters and tell it to the OS.

Typical escape sequences include the following characters.

\a : bell character(alert)
\b : return one character
\f : page feed(clear)
\n : line feed, return
\r : back to the beginning of the same line
\t : horizontal tab
\v : vertical tab
\\ : show \
\' : single quotation mark
\" : double quotation mark
\0 : null

ISO-2022-jP is a character encoding system for Japanese characters used on the internet(especially e-mail). It is characterized by being a 7-bit code that switches the character set using the ISO / IEC 2022 escape sequence (the escape sequence of the announcement function is omitted). There are also sometimes called “JIS code”.

SCII letters, kanji for JIS x 2008 etc, can be used, but half size kana characters etc can not be used.

sjis-win
When “sjis-win” is specified as character code in PHP, Windows-31J which is Shift_JIS extended by Microsoft.

Windows-31J is a character code based on “JIS X 0208-1990” by microsoft, incorporating some of NEC and IBM’s own extended letters, generally called SJIS “model dependent characters”.

What is difference between SJIS and SJIS-WIN?
sjis-win has more characters.
In frequently used places, the following characters are in sjis-win, but not in sjis.

-circle number（①②③…⑳）
-roman numerals（ⅠⅡⅢ…Ⅹ、ⅰⅱⅲ…ⅹ）
-stock with parentheses（㈱）
-High ladders（髙）

Characters that are in SJIS-WiN but not in SJIS
The following three types
– NEC special character
– NEC selection IBM extended character
– IBM extended letters