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whitespace-utils.js
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119 lines (98 loc) · 2.79 KB
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import escapeStringRegexp from "escape-string-regexp";
class WhitespaceUtils {
#whitespaceCharacters;
constructor(whitespaceCharacters) {
this.#whitespaceCharacters = new Set(whitespaceCharacters);
if (
process.env.NODE_ENV !== "production" &&
(this.#whitespaceCharacters.size === 0 ||
Array.prototype.some.call(
whitespaceCharacters,
(character) => !/^\s$/u.test(character),
))
) {
throw new TypeError(
`Invalid characters: ${JSON.stringify(whitespaceCharacters)}`,
);
}
}
getLeadingWhitespaceCount(text) {
const whitespaceCharacters = this.#whitespaceCharacters;
let count = 0;
for (
let index = 0;
index < text.length && whitespaceCharacters.has(text.charAt(index));
index++
) {
count++;
}
return count;
}
getTrailingWhitespaceCount(text) {
const whitespaceCharacters = this.#whitespaceCharacters;
let count = 0;
for (
let index = text.length - 1;
index >= 0 && whitespaceCharacters.has(text.charAt(index));
index--
) {
count++;
}
return count;
}
getLeadingWhitespace(text) {
const count = this.getLeadingWhitespaceCount(text);
return text.slice(0, count);
}
getTrailingWhitespace(text) {
const count = this.getTrailingWhitespaceCount(text);
return text.slice(text.length - count);
}
hasLeadingWhitespace(text) {
return this.#whitespaceCharacters.has(text.charAt(0));
}
hasTrailingWhitespace(text) {
return this.#whitespaceCharacters.has(text.at(-1));
}
trimStart(text) {
const count = this.getLeadingWhitespaceCount(text);
return text.slice(count);
}
trimEnd(text) {
const count = this.getTrailingWhitespaceCount(text);
return text.slice(0, text.length - count);
}
trim(text) {
return this.trimEnd(this.trimStart(text));
}
split(text, captureWhitespace = false) {
const pattern = `[${escapeStringRegexp(
[...this.#whitespaceCharacters].join(""),
)}]+`;
const regexp = new RegExp(
captureWhitespace ? `(${pattern})` : pattern,
"u",
);
return text.split(regexp);
}
hasWhitespaceCharacter(text) {
const whitespaceCharacters = this.#whitespaceCharacters;
return Array.prototype.some.call(text, (character) =>
whitespaceCharacters.has(character),
);
}
hasNonWhitespaceCharacter(text) {
const whitespaceCharacters = this.#whitespaceCharacters;
return Array.prototype.some.call(
text,
(character) => !whitespaceCharacters.has(character),
);
}
isWhitespaceOnly(text) {
const whitespaceCharacters = this.#whitespaceCharacters;
return Array.prototype.every.call(text, (character) =>
whitespaceCharacters.has(character),
);
}
}
export default WhitespaceUtils;