sql-formatter
Version:
Format whitespace in a SQL query to make it more readable
50 lines • 1.39 kB
JavaScript
const START = /\/\*/uy; // matches: /*
const ANY_CHAR = /[\s\S]/uy; // matches single character
const END = /\*\//uy; // matches: */
/**
* An object mimicking a regular expression,
* for matching nested block-comments.
*/
export class NestedComment {
constructor() {
this.lastIndex = 0;
}
exec(input) {
let result = '';
let match;
let nestLevel = 0;
if ((match = this.matchSection(START, input))) {
result += match;
nestLevel++;
}
else {
return null;
}
while (nestLevel > 0) {
if ((match = this.matchSection(START, input))) {
result += match;
nestLevel++;
}
else if ((match = this.matchSection(END, input))) {
result += match;
nestLevel--;
}
else if ((match = this.matchSection(ANY_CHAR, input))) {
result += match;
}
else {
return null;
}
}
return [result];
}
matchSection(regex, input) {
regex.lastIndex = this.lastIndex;
const matches = regex.exec(input);
if (matches) {
this.lastIndex += matches[0].length;
}
return matches ? matches[0] : null;
}
}
//# sourceMappingURL=NestedComment.js.map