gatsby-remark-remove-cjk-breaks

This plugin removes line breaks between CJK characters to avoid an unexpected space between the characters.

Example Output

input markdown

上午好。
这是一个美丽的早晨。

おはようございます。
良い朝ですね。

rendered text on browsers without this plugin

上午好。 这是一个美丽的早晨。

おはようございます。 良い朝ですね。

(A space is unexpectedly inserted between a punctuation and the next character)

rendered text on browsers with this plugin

上午好。这是一个美丽的早晨。

おはようございます。良い朝ですね。

Installation

npm install gatsby-remark-remove-cjk-breaks

Usage

// In your gatsby-config.js
plugins: [
  {
    resolve: `gatsby-transformer-remark`,
    options: {
      plugins: [
        {
          resolve: `gatsby-remark-remove-cjk-breaks`,
          options: {
            // include Hangul characters into CJK character set.
            // default: false
            // NOTE:
            // Hangul is not included in the default CJK character set
            // to avoid the unexpected concatenation of Hangul characters
            // because Korean has a rule to separate characters with a space.
            includeHangul: false,

            // include include squared Latin abbreviation characters.
            // (e.g. ㎅, ㎆) to CJK character set
            // default: false
            includeSquaredLatinAbbrs: false,

            // include emoji sequences into CJK character set.
            // default: false
            includeEmoji: false,

            // add regexp that expresses an additional characters to the default character set.
            // Regular expressions of each object in this array are exclusively added to
            // the CJK character set, which may be extended the above options, and
            // each extended character set is used for the replacing.
            additionalRegexpPairs: [
              {
                // add regexp to the default character set before a line break.
                // It is useful if you use half-width parenthesis without a space n CJK text.
                // default: undefined (that means that only the default character set is used)
                breforeBreak: '\\p{ASCII}',

                // add regexp to the default character set after a line break.
                // It is useful if you use half-width parenthesis without a space in CJK text.
                // default: undefined (that means that only the default character set is used)
                afterBreak: undefined,
              },
            ],
          },
        },
      ]
    }
  },
]

Setting Examples

To use ASCII words without a space in CJK text

// In your gatsby-config.js
plugins: [
  {
    resolve: `gatsby-transformer-remark`,
    options: {
      plugins: [
        {
          resolve: `gatsby-remark-remove-cjk-breaks`,
          options: {
            additionalRegexpPairs: [
              {
                breforeBreak: '\\p{ASCII}',
                afterBreak: undefined,
              },
              {
                breforeBreak: undefined,
                afterBreak: '\\p{ASCII}',
              },
            ],
          },
        },
      ]
    }
  },
]

This setting converts, for example, “中文句子\nan english word\n日本語の文” to “中文句子an english word日本語の文”

To use half-width parentheses without a space in CJK text:

// In your gatsby-config.js
plugins: [
  {
    resolve: `gatsby-transformer-remark`,
    options: {
      plugins: [
        {
          resolve: `gatsby-remark-remove-cjk-breaks`,
          options: {
            additionalRegexpPairs: [
              {
                breforeBreak: '(',
                afterBreak: undefined,
              },
              {
                breforeBreak: undefined,
                afterBreak: ')',
              },
            ],
          },
        },
      ]
    }
  },
]

This setting converts, for example, “半角の丸括弧\n(全角の丸括弧はデフォルトに含まれる)を追加” to “半角の丸括弧(全角の丸括弧はデフォルトに含まれる)を追加”