93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
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import { fieldDB } from './fields.js';
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/**
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* @typedef {Parameters<import('./loader.js').Loader['asm']>[0]} GameVersion
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*/
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const dtype2fmtinfo = {
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8: { prefix: 'hh', mask: 0xff },
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16: { prefix: 'h', mask: 0xffff },
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32: { prefix: '', mask: 0xffffffff },
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};
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/**
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* @param {string} input
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* @param {GameVersion} version
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*/
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export function parseFormat(input, version) {
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const regex = /<(.*?)>/g;
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let preview = '';
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let format = '';
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/** @type {(typeof fieldDB)[string][]} */
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const fields = [];
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/** @type {RegExpExecArray|null} */
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let m = null;
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let i0 = 0;
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while ((m = regex.exec(input))) {
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const { index: i } = m;
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// text
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const text = input.slice(i0, i);
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preview += text;
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format += text.replace(/%/g, '%%');
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// arg
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const [fieldId, fmt0, pvw0] = m[1].split('|');
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const field = fieldDB[fieldId.toLowerCase()];
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if (field) {
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const { dtype } = field;
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let fmt;
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let pvw;
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if (typeof field.preview === 'function') {
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// TODO preview of %s field
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fmt = field.fmt;
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pvw = field.preview(version);
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} else {
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const fmt2 = fmt0 || field.fmt;
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let ipvw = +pvw0;
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if (!pvw0 || !isFinite(ipvw)) ipvw = field.preview;
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let padfmt = '';
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if (dtype === 'float') {
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const m = fmt2.trim().match(/^(?:%?(\d*)\.)?(\d+)([eEf]?)$/);
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padfmt = m?.[1] || '';
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const digit = +(m?.[2] || 0);
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const suffix = m?.[3] || 'f';
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fmt = `%${padfmt}.${digit}${suffix}`;
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pvw = ipvw[suffix === 'f' ? 'toFixed' : 'toExponential'](digit);
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if (suffix === 'E') pvw = pvw.toUpperCase();
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} else {
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const { prefix, mask } = dtype2fmtinfo[dtype];
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ipvw &= mask;
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const m = fmt2.trim().match(/^%?(\d*)h{,2}([dioxXu])$/);
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padfmt = m?.[1] || '';
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const t = m?.[2] || 'u';
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fmt = `%${padfmt}${prefix}${t}`;
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if ('di'.includes(t)) {
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if (ipvw > mask >>> 1) ipvw -= mask;
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pvw = ipvw.toString(10);
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} else if (t === 'o') {
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pvw = (ipvw >>> 0).toString(8);
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} else if ('xX'.includes(t)) {
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pvw = (ipvw >>> 0).toString(16);
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} else {
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pvw = (ipvw >>> 0).toString(10);
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}
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}
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pvw = pvw.padStart(+padfmt, padfmt[0] === '0' ? '0' : ' ');
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}
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preview += pvw;
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format += fmt;
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fields.push(field);
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} else {
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// fail to parse
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preview += m[0];
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format += m[0].replace(/%/g, '%%');
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}
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// next
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i0 = i + m[0].length;
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}
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const text = input.slice(i0);
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preview += text;
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format += text.replace(/%/g, '%%');
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// DONE
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return { preview, format, fields };
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}
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