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const MAX_COLUMNS = 79;
const SEPARATORS = [ ' ', '/', ',', ';' ];
/**
* Split a string literal into multiple lines
* Ex:
* input: '"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."'
* output:
* '""
* "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod "
* "tempor incididunt ut labore et dolore magna aliqua."
* @param {string} literal - A string literal
* @param {string|number} startAt - A prefix (or the negative length of the prefix) the literal will be printed at
* @returns {string} - A multiline string compatible with the POT format
*/
module.exports = function multiline( literal, startAt ) {
const maxPosition = MAX_COLUMNS - 1; // MAX_COLUMNS minus the last character needed for closing string (a ");
let nextSpaceIndex;
let i;
let char;
if ( typeof startAt === 'string' ) {
startAt = -startAt.length;
} else if ( startAt === undefined ) {
startAt = -6;
}
// Remove line break in trailing backslash syntax.
literal = literal.replace( /\\\\\n/g, '' );
// Convert regular line breaks to \n notation.
literal = literal.replace( /\n/g, '\\n' );
if ( literal.length <= startAt + MAX_COLUMNS ) {
return literal.substr( startAt > 0 ? startAt : 0 );
}
if ( startAt < 0 ) {
return '""\n' + multiline( literal, 0 );
}
for ( i = startAt + maxPosition - 1; i > startAt; i-- ) {
char = literal.charAt( i );
if ( SEPARATORS.indexOf( char ) !== -1 ) {
nextSpaceIndex = i;
break;
}
}
// we encountered a very long word, look to the right
if ( ! nextSpaceIndex ) {
for ( i = startAt + maxPosition; i < literal.length - 1; i++ ) {
char = literal.charAt( i );
if ( SEPARATORS.indexOf( char ) !== -1 ) {
nextSpaceIndex = i;
break;
}
}
}
// we encountered a line without separators, don't break it
if ( i === literal.length - 1 ) {
return literal;
}
return (
literal.substring( startAt, nextSpaceIndex + 1 ) +
'"\n' +
multiline( '"' + literal.substr( nextSpaceIndex + 1 ), 0 )
);
};
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