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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';
// MODULES //
var formatInteger = require( './format_integer.js' );
var isString = require( './is_string.js' );
var formatDouble = require( './format_double.js' );
var spacePad = require( './space_pad.js' );
var zeroPad = require( './zero_pad.js' );
// VARIABLES //
var fromCharCode = String.fromCharCode;
var isArray = Array.isArray; // NOTE: We use the global `Array.isArray` function here instead of `@stdlib/assert/is-array` to avoid circular dependencies.
// FUNCTIONS //
/**
* Returns a boolean indicating whether a value is `NaN`.
*
* @private
* @param {*} value - input value
* @returns {boolean} boolean indicating whether a value is `NaN`
*
* @example
* var bool = isnan( NaN );
* // returns true
*
* @example
* var bool = isnan( 4 );
* // returns false
*/
function isnan( value ) { // explicitly define a function here instead of `@stdlib/math/base/assert/is-nan` in order to avoid circular dependencies
return ( value !== value );
}
/**
* Initializes token object with properties of supplied format identifier object or default values if not present.
*
* @private
* @param {Object} token - format identifier object
* @returns {Object} token object
*/
function initialize( token ) {
var out = {};
out.specifier = token.specifier;
out.precision = ( token.precision === void 0 ) ? 1 : token.precision;
out.width = token.width;
out.flags = token.flags || '';
out.mapping = token.mapping;
return out;
}
// MAIN //
/**
* Generates string from a token array by interpolating values.
*
* @param {Array} tokens - string parts and format identifier objects
* @param {Array} ...args - variable values
* @throws {TypeError} first argument must be an array
* @throws {Error} invalid flags
* @returns {string} formatted string
*
* @example
* var tokens = [ 'beep ', { 'specifier': 's' } ];
* var out = formatInterpolate( tokens, 'boop' );
* // returns 'beep boop'
*/
function formatInterpolate( tokens ) {
var hasPeriod;
var flags;
var token;
var flag;
var num;
var out;
var pos;
var i;
var j;
if ( !isArray( tokens ) ) {
throw new TypeError( 'invalid argument. First argument must be an array. Value: `' + tokens + '`.' );
}
out = '';
pos = 1;
for ( i = 0; i < tokens.length; i++ ) {
token = tokens[ i ];
if ( isString( token ) ) {
out += token;
} else {
hasPeriod = token.precision !== void 0;
token = initialize( token );
if ( !token.specifier ) {
throw new TypeError( 'invalid argument. Token is missing `specifier` property. Index: `'+ i +'`. Value: `' + token + '`.' );
}
if ( token.mapping ) {
pos = token.mapping;
}
flags = token.flags;
for ( j = 0; j < flags.length; j++ ) {
flag = flags.charAt( j );
switch ( flag ) {
case ' ':
token.sign = ' ';
break;
case '+':
token.sign = '+';
break;
case '-':
token.padRight = true;
token.padZeros = false;
break;
case '0':
token.padZeros = flags.indexOf( '-' ) < 0; // NOTE: We use built-in `Array.prototype.indexOf` here instead of `@stdlib/assert/contains` in order to avoid circular dependencies.
break;
case '#':
token.alternate = true;
break;
default:
throw new Error( 'invalid flag: ' + flag );
}
}
if ( token.width === '*' ) {
token.width = parseInt( arguments[ pos ], 10 );
pos += 1;
if ( isnan( token.width ) ) {
throw new TypeError( 'the argument for * width at position ' + pos + ' is not a number. Value: `' + token.width + '`.' );
}
if ( token.width < 0 ) {
token.padRight = true;
token.width = -token.width;
}
}
if ( hasPeriod ) {
if ( token.precision === '*' ) {
token.precision = parseInt( arguments[ pos ], 10 );
pos += 1;
if ( isnan( token.precision ) ) {
throw new TypeError( 'the argument for * precision at position ' + pos + ' is not a number. Value: `' + token.precision + '`.' );
}
if ( token.precision < 0 ) {
token.precision = 1;
hasPeriod = false;
}
}
}
token.arg = arguments[ pos ];
switch ( token.specifier ) {
case 'b':
case 'o':
case 'x':
case 'X':
case 'd':
case 'i':
case 'u':
// Case: %b (binary), %o (octal), %x, %X (hexadecimal), %d, %i (decimal), %u (unsigned decimal)
if ( hasPeriod ) {
token.padZeros = false;
}
token.arg = formatInteger( token );
break;
case 's':
// Case: %s (string)
token.maxWidth = ( hasPeriod ) ? token.precision : -1;
token.arg = String( token.arg );
break;
case 'c':
// Case: %c (character)
if ( !isnan( token.arg ) ) {
num = parseInt( token.arg, 10 );
if ( num < 0 || num > 127 ) {
throw new Error( 'invalid character code. Value: ' + token.arg );
}
token.arg = ( isnan( num ) ) ? String( token.arg ) : fromCharCode( num ); // eslint-disable-line max-len
}
break;
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
// Case: %e, %E (scientific notation), %f, %F (decimal floating point), %g, %G (uses the shorter of %e/E or %f/F)
if ( !hasPeriod ) {
token.precision = 6;
}
token.arg = formatDouble( token );
break;
default:
throw new Error( 'invalid specifier: ' + token.specifier );
}
// Fit argument into field width...
if ( token.maxWidth >= 0 && token.arg.length > token.maxWidth ) {
token.arg = token.arg.substring( 0, token.maxWidth );
}
if ( token.padZeros ) {
token.arg = zeroPad( token.arg, token.width || token.precision, token.padRight ); // eslint-disable-line max-len
} else if ( token.width ) {
token.arg = spacePad( token.arg, token.width, token.padRight );
}
out += token.arg || '';
pos += 1;
}
}
return out;
}
// EXPORTS //
module.exports = formatInterpolate;
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