xsheetjs/bits/90_utils.js

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var _chr = function(c) { return String.fromCharCode(c); };
function encode_col(col) { var s=""; for(++col; col; col=Math.floor((col-1)/26)) s = _chr(((col-1)%26) + 65) + s; return s; }
function encode_row(row) { return "" + (row + 1); }
function encode_cell(cell) { return encode_col(cell.c) + encode_row(cell.r); }
function decode_col(c) { var d = 0, i = 0; for(; i !== c.length; ++i) d = 26*d + c.charCodeAt(i) - 64; return d - 1; }
function decode_row(rowstr) { return Number(rowstr) - 1; }
function split_cell(cstr) { return cstr.replace(/(\$?[A-Z]*)(\$?[0-9]*)/,"$1,$2").split(","); }
function decode_cell(cstr) { var splt = split_cell(cstr); return { c:decode_col(splt[0]), r:decode_row(splt[1]) }; }
function decode_range(range) { var x =range.split(":").map(decode_cell); return {s:x[0],e:x[x.length-1]}; }
function encode_range(range) { return encode_cell(range.s) + ":" + encode_cell(range.e); }
/**
* Convert a sheet into an array of objects where the column headers are keys.
**/
function sheet_to_row_object_array(sheet){
var val, rowObject, range, columnHeaders, emptyRow, C;
var outSheet = [];
if (sheet["!ref"]) {
range = decode_range(sheet["!ref"]);
columnHeaders = {};
for (C = range.s.c; C <= range.e.c; ++C) {
val = sheet[encode_cell({
c: C,
r: range.s.r
})];
if(val){
switch(val.t) {
case 's': case 'str': columnHeaders[C] = val.v; break;
case 'n': columnHeaders[C] = val.v; break;
}
}
}
for (var R = range.s.r + 1; R <= range.e.r; ++R) {
emptyRow = true;
//Row number is recorded in the prototype
//so that it doesn't appear when stringified.
rowObject = Object.create({ __rowNum__ : R });
for (C = range.s.c; C <= range.e.c; ++C) {
val = sheet[encode_cell({
c: C,
r: R
})];
if(val !== undefined) switch(val.t){
case 's': case 'str': case 'b': case 'n':
if(val.v !== undefined) {
rowObject[columnHeaders[C]] = val.v;
emptyRow = false;
}
break;
case 'e': break; /* throw */
default: throw 'unrecognized type ' + val.t;
}
}
if(!emptyRow) {
outSheet.push(rowObject);
}
}
}
return outSheet;
}
function sheet_to_csv(sheet) {
var stringify = function stringify(val) {
switch(val.t){
case 'n': return String(val.v);
case 's': case 'str':
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if(typeof val.v === 'undefined') return "";
return JSON.stringify(val.v);
case 'b': return val.v ? "TRUE" : "FALSE";
case 'e': return ""; /* throw out value in case of error */
default: throw 'unrecognized type ' + val.t;
}
};
var out = "";
if(sheet["!ref"]) {
var r = utils.decode_range(sheet["!ref"]);
for(var R = r.s.r; R <= r.e.r; ++R) {
var row = [];
for(var C = r.s.c; C <= r.e.c; ++C) {
var val = sheet[utils.encode_cell({c:C,r:R})];
row.push(val ? stringify(val).replace(/\\r\\n/g,"\n").replace(/\\t/g,"\t").replace(/\\\\/g,"\\").replace("\\\"","\"\"") : "");
}
out += row.join(",") + "\n";
}
}
return out;
}
function get_formulae(ws) {
var cmds = [];
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for(var y in ws) if(y[0] !=='!' && ws.hasOwnProperty(y)) {
var x = ws[y];
var val = "";
if(x.f) val = x.f;
else if(typeof x.v === 'number') val = x.v;
else val = x.v;
cmds.push(y + "=" + val);
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}
return cmds;
}
var utils = {
encode_col: encode_col,
encode_row: encode_row,
encode_cell: encode_cell,
encode_range: encode_range,
decode_col: decode_col,
decode_row: decode_row,
split_cell: split_cell,
decode_cell: decode_cell,
decode_range: decode_range,
sheet_to_csv: sheet_to_csv,
get_formulae: get_formulae,
sheet_to_row_object_array: sheet_to_row_object_array
};