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* @license Apache-2.0
*
* Copyright (c) 2022 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// VARIABLES //
var RE = /%(?:([1-9]\d*)\$)?([0 +\-#]*)(\*|\d+)?(?:(\.)(\*|\d+)?)?[hlL]?([%A-Za-z])/g;
// FUNCTIONS //
/**
* Parses a delimiter.
*
* @private
* @param {Array} match - regular expression match
* @returns {Object} delimiter token object
*/
function parse( match ) {
var token = {
'mapping': ( match[ 1 ] ) ? parseInt( match[ 1 ], 10 ) : void 0,
'flags': match[ 2 ],
'width': match[ 3 ],
'precision': match[ 5 ],
'specifier': match[ 6 ]
};
if ( match[ 4 ] === '.' && match[ 5 ] === void 0 ) {
token.precision = '1';
}
return token;
}
// MAIN //
/**
* Tokenizes a string into an array of string parts and format identifier objects.
*
* @param {string} str - input string
* @returns {Array} tokens
*
* @example
* var tokens = formatTokenize( 'Hello %s!' );
* // returns [ 'Hello ', {...}, '!' ]
*/
function formatTokenize( str ) {
var content;
var tokens;
var match;
var prev;
tokens = [];
prev = 0;
match = RE.exec( str );
while ( match ) {
content = str.slice( prev, RE.lastIndex - match[ 0 ].length );
if ( content.length ) {
tokens.push( content );
}
// Check for an escaped percent sign `%%`...
if ( match[ 6 ] === '%' ) {
tokens.push( '%' );
} else {
tokens.push( parse( match ) );
}
prev = RE.lastIndex;
match = RE.exec( str );
}
content = str.slice( prev );
if ( content.length ) {
tokens.push( content );
}
return tokens;
}
// EXPORTS //
module.exports = formatTokenize;
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