forked from sheetjs/sheetjs
41 lines
1.6 KiB
TypeScript
41 lines
1.6 KiB
TypeScript
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/*! sheetjs (C) 2013-present SheetJS -- http://sheetjs.com */
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import { CellObject } from '../../';
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import { u8_to_dataview, popcnt } from './util';
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function parseit(buf: Uint8Array, version: number): CellObject {
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var dv = u8_to_dataview(buf);
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var ctype = buf[version == 4 ? 1 : 2];
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/* TODO: find the correct field position of number formats, formulae, etc */
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var flags = dv.getUint32(4, true);
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var data_offset = 12 + popcnt(flags & 0x3F8E) * 4;
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var sidx = -1, ieee = NaN, dt = NaN;
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if(flags & 0x10) { sidx = dv.getUint32(data_offset, true); data_offset += 4; }
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if(flags & 0x20) { ieee = dv.getFloat64(data_offset, true); data_offset += 8; }
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if(flags & 0x40) { dt = dv.getFloat64(data_offset, true); data_offset += 8; }
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var ret;
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switch(ctype) {
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case 0: break; // return { t: "z" }; // blank?
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case 2: ret = { t: "n", v: ieee }; break;
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case 3: ret = { t: "s", v: sidx }; break;
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case 5: var dd = new Date(2001, 0, 1); dd.setTime(dd.getTime() + dt * 1000); ret = { t: "d", v: dd }; break; // date-time TODO: relative or absolute?
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case 6: ret = { t: "b", v: ieee > 0 }; break;
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case 7: ret = { t: "n", v: ieee }; break; // duration in seconds TODO: emit [hh]:[mm] style format with adjusted value
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default: throw new Error(`Unsupported cell type ${buf.slice(0,4)}`);
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}
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/* TODO: Some fields appear after the cell data */
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return ret;
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}
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function parse(buf: Uint8Array): CellObject {
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var version = buf[0]; // numbers 3.5 uses "3", 6.x - 11.x use "4"
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switch(version) {
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case 3: case 4: return parseit(buf, version);
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default: throw new Error(`Unsupported pre-BNC version ${version}`);
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}
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}
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export { parse };
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