forked from sheetjs/sheetjs
SheetJS
577070b8d7
- simplified and documented General format processing - moved CLI to ssf-cli package (h/t @garrettluu)
72 lines
2.5 KiB
JavaScript
72 lines
2.5 KiB
JavaScript
/* The longest 32-bit integer text is "-4294967296", exactly 11 chars */
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function general_fmt_int(v/*:number*/)/*:string*/ { return v.toString(10); }
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SSF._general_int = general_fmt_int;
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/* ECMA-376 18.8.30 numFmt*/
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/* Note: `toPrecision` uses standard form when prec > E and E >= -6 */
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var general_fmt_num = (function make_general_fmt_num() {
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var trailing_zeroes_and_decimal = /(?:\.0*|(\.\d*[1-9])0+)$/;
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function strip_decimal(o/*:string*/)/*:string*/ {
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return (o.indexOf(".") == -1) ? o : o.replace(trailing_zeroes_and_decimal, "$1");
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}
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/* General Exponential always shows 2 digits exp and trims the mantissa */
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var mantissa_zeroes_and_decimal = /(?:\.0*|(\.\d*[1-9])0+)[Ee]/;
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var exp_with_single_digit = /(E[+-])(\d)$/;
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function normalize_exp(o/*:string*/)/*:string*/ {
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if(o.indexOf("E") == -1) return o;
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return o.replace(mantissa_zeroes_and_decimal,"$1E").replace(exp_with_single_digit,"$10$2");
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}
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/* exponent >= -9 and <= 9 */
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function small_exp(v/*:number*/)/*:string*/ {
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var w = (v<0?12:11);
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var o = strip_decimal(v.toFixed(12)); if(o.length <= w) return o;
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o = v.toPrecision(10); if(o.length <= w) return o;
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return v.toExponential(5);
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}
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/* exponent >= 11 or <= -10 likely exponential */
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function large_exp(v/*:number*/)/*:string*/ {
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var o = strip_decimal(v.toFixed(11));
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return (o.length > (v<0?12:11) || o === "0" || o === "-0") ? v.toPrecision(6) : o;
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}
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function general_fmt_num_base(v/*:number*/)/*:string*/ {
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var V = Math.floor(Math.log(Math.abs(v))*Math.LOG10E), o;
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if(V >= -4 && V <= -1) o = v.toPrecision(10+V);
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else if(Math.abs(V) <= 9) o = small_exp(v);
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else if(V === 10) o = v.toFixed(10).substr(0,12);
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else o = large_exp(v);
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return strip_decimal(normalize_exp(o.toUpperCase()));
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}
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return general_fmt_num_base;
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})();
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SSF._general_num = general_fmt_num;
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/*
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"General" rules:
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- text is passed through ("@")
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- booleans are rendered as TRUE/FALSE
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- "up to 11 characters" displayed for numbers
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- Default date format (code 14) used for Dates
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TODO: technically the display depends on the width of the cell
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*/
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function general_fmt(v/*:any*/, opts/*:any*/) {
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switch(typeof v) {
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case 'string': return v;
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case 'boolean': return v ? "TRUE" : "FALSE";
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case 'number': return (v|0) === v ? v.toString(10) : general_fmt_num(v);
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case 'undefined': return "";
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case 'object':
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if(v == null) return "";
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if(v instanceof Date) return format(14, datenum_local(v, opts && opts.date1904), opts);
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}
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throw new Error("unsupported value in General format: " + v);
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}
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SSF._general = general_fmt;
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