version bump 0.12.8: sheetRows multiformat support

- all formats accept `sheetRows` option (fixes #1062 h/t @prog666) - `table_to_*` support for `sheetRows` - demo cleanup
2018-04-06 02:39:48 -04:00 · 2018-04-06 02:39:48 -04:00 · 93f7749bec
parent 3592efa77b
commit 93f7749bec
37 changed files with 728 additions and 135 deletions
--- a/.spelling
+++ b/.spelling
@ -107,6 +107,12 @@ AngularJS
 NativeScript
 angular-cli

+ - demos/array/README.md
+WebGL
+WebAssembly
+dataset
+TensorFlow
+
 - demos/database/README.md
 Knex
 LowDB
--- a/README.md
+++ b/README.md
@ -198,6 +198,7 @@ The [`demos` directory](demos/) includes sample projects for:
 - [`XMLHttpRequest and fetch`](demos/xhr/)
 - [`nodejs server`](demos/server/)
 - [`databases and key/value stores`](demos/database/)
+- [`typed arrays and math`](demos/array/)

 **Bundlers and Tooling**
 - [`browserify`](demos/browserify/)
@ -2045,9 +2046,10 @@ Both functions accept options arguments:

 | Option Name |  Default | Description                                         |
 | :---------- | :------: | :-------------------------------------------------- |
+|`raw`        |          | If true, every cell will hold raw strings           |
 |`dateNF`     |  FMT 14  | Use specified date format in string output          |
 |`cellDates`  |  false   | Store dates as type `d` (default is `n`)            |
-|`raw`        |          | If true, every cell will hold raw strings           |
+|`sheetRows`  |    0     | If >0, read the first `sheetRows` rows of the table |


 <details>
--- a/bits/01_version.js
+++ b/bits/01_version.js
@ -1 +1 @@
-XLSX.version = '0.12.7';
+XLSX.version = '0.12.8';
--- a/bits/40_harb.js
+++ b/bits/40_harb.js
@ -180,6 +180,7 @@ function dbf_to_aoa(buf, opts)/*:AOA*/ {
 		}
 	}
 	if(ft != 0x02) if(d.l < d.length && d[d.l++] != 0x1A) throw new Error("DBF EOF Marker missing " + (d.l-1) + " of " + d.length + " " + d[d.l-1].toString(16));
+	if(opts && opts.sheetRows) out = out.slice(0, opts.sheetRows);
 	return out;
 }

@ -206,7 +207,8 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 	for(i = 0; i < headers.length; ++i) {
 		if(i == null) continue;
 		++hcnt;
-		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name");
+		if(typeof headers[i] === 'number') headers[i] = headers[i].toString(10);
+		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name " + headers[i] + " |" + (typeof headers[i]) + "|");
 		if(headers.indexOf(headers[i]) !== i) for(j=0; j<1024;++j)
 			if(headers.indexOf(headers[i] + "_" + j) == -1) { headers[i] += "_" + j; break; }
 	}
@ -394,6 +396,7 @@ var SYLK = (function() {
 		}
 		if(rowinfo.length > 0) sht['!rows'] = rowinfo;
 		if(colinfo.length > 0) sht['!cols'] = colinfo;
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return [arr, sht];
 	}

@ -484,7 +487,7 @@ var DIF = (function() {
 		}
 		throw new Error("Unrecognized type " + opts.type);
 	}
-	function dif_to_aoa_str(str/*:string*//*::, opts*/)/*:AOA*/ {
+	function dif_to_aoa_str(str/*:string*/, opts)/*:AOA*/ {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr/*:AOA*/ = [];
 		for (; ri !== records.length; ++ri) {
 			if (records[ri].trim() === 'BOT') { arr[++R] = []; C = 0; continue; }
@ -512,6 +515,7 @@ var DIF = (function() {
 			}
 			if (data === 'EOD') break;
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -585,7 +589,7 @@ var ETH = (function() {
 	function decode(s/*:string*/)/*:string*/ { return s.replace(/\\b/g,"\\").replace(/\\c/g,":").replace(/\\n/g,"\n"); }
 	function encode(s/*:string*/)/*:string*/ { return s.replace(/\\/g, "\\b").replace(/:/g, "\\c").replace(/\n/g,"\\n"); }

-	function eth_to_aoa(str/*:string*//*::, opts*/)/*:AOA*/ {
+	function eth_to_aoa(str/*:string*/, opts)/*:AOA*/ {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr/*:AOA*/ = [];
 		for (; ri !== records.length; ++ri) {
 			var record = records[ri].trim().split(":");
@ -606,6 +610,7 @@ var ETH = (function() {
 					if(record[2] == 'vtf') arr[R][C] = [arr[R][C], _f];
 			}
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -713,6 +718,7 @@ var PRN = (function() {
 			for(C = 1; C <= (lines[R].length - start)/10 + 1; ++C)
 				set_text_arr(lines[R].slice(start+(C-1)*10,start+C*10).trim(),arr,R,C,o);
 		}
+		if(o.sheetRows) arr = arr.slice(0, o.sheetRows);
 		return arr;
 	}

@ -799,11 +805,11 @@ var PRN = (function() {
 			start = end+1;
 			if(range.e.c < C) range.e.c = C;
 			if(range.e.r < R) range.e.r = R;
-			if(cc == sepcc) ++C; else { C = 0; ++R; }
+			if(cc == sepcc) ++C; else { C = 0; ++R; if(o.sheetRows && o.sheetRows <= R) return true; }
 		}
-		for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
+		outer: for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
 			case 0x22: instr = !instr; break;
-			case sepcc: case 0x0a: case 0x0d: if(!instr) finish_cell(); break;
+			case sepcc: case 0x0a: case 0x0d: if(!instr && finish_cell()) break outer; break;
 			default: break;
 		}
 		if(end - start > 0) finish_cell();
--- a/bits/41_lotus.js
+++ b/bits/41_lotus.js
@ -24,7 +24,7 @@ var WK_ = (function() {
 		throw "Unsupported type " + opts.type;
 	}

-	function lotus_to_workbook_buf(d,opts)/*:Workbook*/ {
+	function lotus_to_workbook_buf(d, opts)/*:Workbook*/ {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
@ -32,6 +32,7 @@ var WK_ = (function() {
 		var sheets = {}, snames = [n];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
+		var sheetRows = o.sheetRows || 0;

 		if(d[2] == 0x02) o.Enum = WK1Enum;
 		else if(d[2] == 0x1a) o.Enum = WK3Enum;
@ -79,6 +80,7 @@ var WK_ = (function() {
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 						snames.push(n);
 					}
+					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
 						if(!s[val[0].r]) s[val[0].r] = [];
 						s[val[0].r][val[0].c] = val[1];
--- a/bits/67_wsxml.js
+++ b/bits/67_wsxml.js
@ -75,7 +75,7 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
--- a/bits/68_wsbin.js
+++ b/bits/68_wsbin.js
@ -645,7 +645,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 	if(!s["!ref"] && (refguess.s.r < 2000000 || ref && (ref.e.r > 0 || ref.e.c > 0 || ref.s.r > 0 || ref.s.c > 0))) s["!ref"] = encode_range(ref || refguess);
 	if(opts.sheetRows && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
--- a/bits/75_xlml.js
+++ b/bits/75_xlml.js
@ -276,7 +276,14 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 			if(Rn[1]==='/'){
 				if((tmp=state.pop())[0]!==Rn[3]) throw new Error("Bad state: "+tmp.join("|"));
 				sheetnames.push(sheetname);
-				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) cursheet["!ref"] = encode_range(refguess);
+				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) {
+					cursheet["!ref"] = encode_range(refguess);
+					if(opts.sheetRows && opts.sheetRows <= refguess.e.r) {
+						cursheet["!fullref"] = cursheet["!ref"];
+						refguess.e.r = opts.sheetRows - 1;
+						cursheet["!ref"] = encode_range(refguess);
+					}
+				}
 				if(merges.length) cursheet["!merges"] = merges;
 				if(cstys.length > 0) cursheet["!cols"] = cstys;
 				if(rowinfo.length > 0) cursheet["!rows"] = rowinfo;
--- a/bits/76_xls.js
+++ b/bits/76_xls.js
@ -129,6 +129,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	};
 	var addcell = function addcell(cell/*:any*/, line/*:any*/, options/*:any*/) {
 		if(file_depth > 1) return;
+		if(options.sheetRows && cell.r >= options.sheetRows) cell_valid = false;
 		if(!cell_valid) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -152,8 +153,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				break;
 			}
 		}
-		if(options.sheetRows && lastcell.r >= options.sheetRows) cell_valid = false;
-		else {
+		{
 			if(options.dense) {
 				if(!out[cell.r]) out[cell.r] = [];
 				out[cell.r][cell.c] = line;
@ -319,6 +319,13 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
 							out["!ref"] = encode_range(range);
+							if(options.sheetRows && options.sheetRows <= range.e.r) {
+								var tmpri = range.e.r;
+								range.e.r = options.sheetRows - 1;
+								out["!fullref"] = out["!ref"];
+								out["!ref"] = encode_range(range);
+								range.e.r = tmpri;
+							}
 							range.e.r++; range.e.c++;
 						}
 						if(merges.length > 0) out["!merges"] = merges;
--- a/bits/79_html.js
+++ b/bits/79_html.js
@ -15,7 +15,7 @@ var HTML_ = (function() {
 		for(i = 0; i < rows.length; ++i) {
 			var row = rows[i].trim();
 			var hd = row.slice(0,3).toLowerCase();
-			if(hd == "<tr") { ++R; C = 0; continue; }
+			if(hd == "<tr") { ++R; if(opts.sheetRows && opts.sheetRows <= R) { --R; break; } C = 0; continue; }
 			if(hd != "<td") continue;
 			var cells = row.split(/<\/td>/i);
 			for(j = 0; j < cells.length; ++j) {
@ -119,10 +119,11 @@ function parse_dom_table(table/*:HTMLElement*/, _opts/*:?any*/)/*:Worksheet*/ {
 	if(DENSE != null) opts.dense = DENSE;
 	var ws/*:Worksheet*/ = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 	var rows/*:HTMLCollection<HTMLTableRowElement>*/ = table.getElementsByTagName('tr');
-	var range/*:Range*/ = {s:{r:0,c:0},e:{r:rows.length - 1,c:0}};
+	var sheetRows = Math.min(opts.sheetRows||10000000, rows.length);
+	var range/*:Range*/ = {s:{r:0,c:0},e:{r:sheetRows - 1,c:0}};
 	var merges/*:Array<Range>*/ = [], midx = 0;
 	var R = 0, _C = 0, C = 0, RS = 0, CS = 0;
-	for(; R < rows.length; ++R) {
+	for(; R < sheetRows; ++R) {
 		var row/*:HTMLTableRowElement*/ = rows[R];
 		var elts/*:HTMLCollection<HTMLTableCellElement>*/ = (row.children/*:any*/);
 		for(_C = C = 0; _C < elts.length; ++_C) {
@ -156,6 +157,7 @@ function parse_dom_table(table/*:HTMLElement*/, _opts/*:?any*/)/*:Worksheet*/ {
 	}
 	ws['!merges'] = merges;
 	ws['!ref'] = encode_range(range);
+	if(sheetRows < rows.length) ws['!fullref'] = encode_range((range.e.r = rows.length-1,range));
 	return ws;
 }

--- a/bits/80_parseods.js
+++ b/bits/80_parseods.js
@ -62,6 +62,11 @@ var parse_content_xml = (function() {
 			case 'table': case '工作表': // 9.1.2 <table:table>
 				if(Rn[1]==='/') {
 					if(range.e.c >= range.s.c && range.e.r >= range.s.r) ws['!ref'] = encode_range(range);
+					if(opts.sheetRows > 0 && opts.sheetRows <= range.e.r) {
+						ws['!fullref'] = ws['!ref'];
+						range.e.r = opts.sheetRows - 1;
+						ws['!ref'] = encode_range(range);
+					}
 					if(merges.length) ws['!merges'] = merges;
 					if(rowinfo.length) ws["!rows"] = rowinfo;
 					sheetag.name = utf8read(sheetag['名称'] || sheetag.name);
@ -178,7 +183,7 @@ var parse_content_xml = (function() {
 					if(comments.length > 0) { q.c = comments; comments = []; }
 					if(textp && opts.cellText !== false) q.w = textp;
 					if(!isstub || opts.sheetStubs) {
-						if(!(opts.sheetRows && opts.sheetRows < R)) {
+						if(!(opts.sheetRows && opts.sheetRows <= R)) {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {
--- a/demos/README.md
+++ b/demos/README.md
@ -26,6 +26,7 @@ can be installed with Bash on Windows or with `cygwin`.
 - [`XMLHttpRequest and fetch`](xhr/)
 - [`nodejs server`](server/)
 - [`databases and key/value stores`](database/)
+- [`typed arrays and math`](array/)

 **Bundlers and Tooling**
 - [`browserify`](browserify/)
--- a/demos/array/Makefile
+++ b/demos/array/Makefile
@ -0,0 +1,8 @@
+.PHONY: tfjs
+tfjs:
+	npm install @tensorflow/tfjs
+	node tf.js
+
+.PHONY: propel
+propel:
+	node propel.js
--- a/demos/array/README.md
+++ b/demos/array/README.md
@ -0,0 +1,155 @@
+# Typed Arrays and Math
+
+ECMAScript version 6 introduced Typed Arrays, array-like objects designed for
+low-level optimizations and predictable operations.  They are supported in most
+modern browsers and form the basis of various APIs, including NodeJS Buffers,
+WebGL buffers, WebAssembly, and tensors in linear algebra and math libraries.
+
+This demo covers conversions between worksheets and Typed Arrays.  It also tries
+to cover common numerical libraries that work with data arrays.
+
+Excel supports a subset of the IEEE754 Double precision floating point numbers,
+but many libraries only support `Float32` Single precision values. `Math.fround`
+rounds `Number` values to the nearest single-precision floating point value.
+
+## Working with Data in Typed Arrays
+
+Typed arrays are not true Array objects.  The array of array utility functions
+like `aoa_to_sheet` will not handle arrays of Typed Arrays.
+
+#### Exporting Typed Arrays to a Worksheet
+
+A single typed array can be converted to a pure JS array with `Array.from`:
+
+```js
+var column = Array.from(dataset_typedarray);
+```
+
+`aoa_to_sheet` expects a row-major array of arrays.  To export multiple data
+sets, "transpose" the data:
+
+```js
+/* assuming data is an array of typed arrays */
+var aoa = [];
+for(var i = 0; i < data.length; ++i) {
+  for(var j = 0; j < data[i].length; ++j) {
+    if(!aoa[j]) aoa[j] = [];
+    aoa[j][i] = data[i][j];
+  }
+}
+/* aoa can be directly converted to a worksheet object */
+var ws = XLSX.utils.aoa_to_sheet(aoa);
+```
+
+#### Importing Data from a Spreadsheet
+
+`sheet_to_json` with the option `header:1` will generate a row-major array of
+arrays that can be transposed.  However, it is more efficient to walk the sheet
+manually:
+
+```js
+/* find worksheet range */
+var range = XLSX.utils.decode_range(ws['!ref']);
+var out = []
+/* walk the columns */
+for(var C = range.s.c; C <= range.e.c; ++C) {
+  /* create the typed array */
+  var ta = new Float32Array(range.e.r - range.s.r + 1);
+  /* walk the rows */
+  for(var R = range.s.r; R <= range.e.r; ++R) {
+    /* find the cell, skip it if the cell isn't numeric or boolean */
+    var cell = ws[XLSX.utils.encode_cell({r:R, c:C})];
+    if(!cell || cell.t != 'n' && cell.t != 'b') continue;
+    /* assign to the typed array */
+    ta[R - range.s.r] = cell.v;
+  }
+  out.push(ta);
+}
+```
+
+If the data set has a header row, the loop can be adjusted to skip those rows.
+
+
+## Demos
+
+Each example focuses on single-variable linear regression.  Sample worksheets
+will start with a label row.  The first column is the x-value and the second
+column is the y-value.  A sample spreadsheet can be generated randomly:
+
+```js
+var aoo = [];
+for(var i = 0; i < 100; ++i) aoo.push({x:i, y:2 * i + Math.random()});
+var ws = XLSX.utils.json_to_sheet(aoo);
+var wb = XLSX.utils.book_new(); XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
+XLSX.writeFile(wb, "linreg.xlsx");
+```
+
+Some libraries provide utility functions that work with plain arrays of numbers.
+When possible, they should be preferred over manual conversion.
+
+Reshaping raw float arrays and exporting to a worksheet is straightforward:
+
+```js
+function array_to_sheet(farray, shape, headers) {
+  /* generate new AOA from the float array */
+  var aoa = [];
+  for(var j = 0; j < shape[0]; ++j) {
+    aoa[j] = [];
+    for(var i = 0; i < shape[1]; ++i) aoa[j][i] = farray[j * shape[1] + i];
+  }
+
+  /* add headers and generate worksheet */
+  if(headers) aoa.unshift(headers);
+  return XLSX.utils.aoa_to_sheet(aoa);
+}
+```
+
+#### Tensor Operations with Propel ML
+
+[Propel ML](http://propelml.org/) `tensor` objects can be transposed:
+
+```js
+var tensor = pr.tensor(aoa).transpose();
+var col1 = tensor.slice(0, 1);
+var col2 = tensor.slice(1, 1);
+```
+
+To export to a worksheet, `dataSync` generates a `Float32Array` that can be
+re-shaped in JS:
+
+```js
+/* extract shape and float array */
+var tensor = pr.concat([col1, col2]).transpose();
+var shape = tensor.shape;
+var farray = tensor.dataSync();
+var ws = array_to_sheet(farray, shape, ["header1", "header2"]);
+```
+
+The demo generates a sample dataset and uses Propel to calculate the OLS linear
+regression coefficients.  Afterwards, the tensors are exported to a new file.
+
+#### TensorFlow
+
+[TensorFlow](https://js.tensorflow.org/) `tensor` objects can be created from
+arrays of arrays:
+
+```js
+var tensor = tf.tensor2d(aoa).transpose();
+var col1 = tensor.slice([0,0], [1,tensor.shape[1]]).flatten();
+var col2 = tensor.slice([1,0], [1,tensor.shape[1]]).flatten();
+```
+
+`stack` should be used to create the 2-d tensor for export:
+
+```js
+var tensor = tf.stack([col1, col2]).transpose();
+var shape = tensor.shape;
+var farray = tensor.dataSync();
+var ws = array_to_sheet(farray, shape, ["header1", "header2"]);
+```
+
+The demo generates a sample dataset and uses a simple linear predictor with
+least-squares scoring to calculate regression coefficients.  The tensors are
+exported to a new file.
+
+[![Analytics](https://ga-beacon.appspot.com/UA-36810333-1/SheetJS/js-xlsx?pixel)](https://github.com/SheetJS/js-xlsx)
--- a/demos/array/linest.js
+++ b/demos/array/linest.js
@ -0,0 +1,27 @@
+/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
+/*global module, require, XLSX:true */
+if(typeof require !== 'undefined' && typeof XLSX === 'undefined') XLSX = require('xlsx');
+
+function generate_random_file(n) {
+	if(!n) n = 100;
+	var aoo = [];
+	var x_ = 0, y_ = 0, xx = 0, xy = 0;
+	for(var i = 0; i < n; ++i) {
+		var y = Math.fround(2 * i + Math.random());
+		aoo.push({x:i, y:y});
+		x_ += i / n; y_ += y / n; xx += i*i; xy += i * y;
+	}
+	var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
+	console.log(m, Math.fround(y_ - m * x_), "JS Pre");
+	var ws = XLSX.utils.json_to_sheet(aoo);
+	var wb = XLSX.utils.book_new();
+	XLSX.utils.book_append_sheet(wb, ws, "Sheet1");
+	ws = XLSX.utils.aoa_to_sheet([[2, 0]]);
+	XLSX.utils.sheet_set_array_formula(ws, "A1:B1", "LINEST(Sheet1!B2:B101,Sheet1!A2:A101)");
+	XLSX.utils.book_append_sheet(wb, ws, "Sheet2");
+
+	XLSX.writeFile(wb, "linreg.xlsx");
+}
+if(typeof module !== 'undefined') module.exports = {
+	generate_random_file: generate_random_file
+};
--- a/demos/array/propel.js
+++ b/demos/array/propel.js
@ -0,0 +1,59 @@
+/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
+/* eslint-env node */
+var XLSX = require('xlsx');
+var pr = require('propel');
+var linest = require('./linest');
+
+/* generate linreg.xlsx with 100 random points */
+linest.generate_random_file(100);
+
+/* get the first worksheet as an array of arrays, skip the first row */
+var wb = XLSX.readFile('linreg.xlsx');
+var ws = wb.Sheets[wb.SheetNames[0]];
+var aoa = XLSX.utils.sheet_to_json(ws, {header:1, raw:true}).slice(1);
+
+/* calculate the coefficients in JS */
+(function(aoa) {
+	var x_ = 0, y_ = 0, xx = 0, xy = 0, n = aoa.length;
+	for(var i = 0; i < n; ++i) {
+		x_ += aoa[i][0] / n;
+		y_ += aoa[i][1] / n;
+		xx += aoa[i][0] * aoa[i][0];
+		xy += aoa[i][0] * aoa[i][1];
+	}
+	var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
+	console.log(m, Math.fround(y_ - m * x_), "JS Post");
+})(aoa);
+
+/* build X and Y vectors */
+var tensor = pr.tensor(aoa).transpose();
+var xs = tensor.slice(0, 1);
+var ys = tensor.slice(1, 1);
+
+/* compute the coefficient */
+var n = xs.size;
+var x_ = Math.fround(xs.reduceMean().dataSync()[0]);
+var y_ = Math.fround(ys.reduceMean().dataSync()[0]);
+var xx = Math.fround(xs.dot(xs.transpose()).dataSync()[0]);
+var xy = Math.fround(xs.dot(ys.transpose()).dataSync()[0]);
+var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
+var b_ = Math.fround(y_ - m * x_);
+console.log(m, b_, "Propel");
+var yh = xs.mul(m).add(b_);
+
+/* export data to aoa */
+var prdata = pr.concat([xs, ys, yh]).transpose();
+var shape = prdata.shape;
+var prarr = prdata.dataSync();
+var praoa = [];
+for(var j = 0; j < shape[0]; ++j) {
+	praoa[j] = [];
+	for(var i = 0; i < shape[1]; ++i) praoa[j][i] = prarr[j * shape[1] + i];
+}
+
+/* add headers and export */
+praoa.unshift(["x", "y", "pred"]);
+var new_ws = XLSX.utils.aoa_to_sheet(praoa);
+var new_wb = XLSX.utils.book_new();
+XLSX.utils.book_append_sheet(new_wb, new_ws, "Sheet1");
+XLSX.writeFile(new_wb, "propel.xls");
--- a/demos/array/tf.js
+++ b/demos/array/tf.js
@ -0,0 +1,78 @@
+/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
+/* eslint-env node */
+var XLSX = require('xlsx');
+var tf = require('@tensorflow/tfjs');
+var linest = require('./linest');
+
+/* generate linreg.xlsx with 100 random points */
+var N = 100;
+linest.generate_random_file(N);
+
+/* get the first worksheet as an array of arrays, skip the first row */
+var wb = XLSX.readFile('linreg.xlsx');
+var ws = wb.Sheets[wb.SheetNames[0]];
+var aoa = XLSX.utils.sheet_to_json(ws, {header:1, raw:true}).slice(1);
+
+/* calculate the coefficients in JS */
+(function(aoa) {
+	var x_ = 0, y_ = 0, xx = 0, xy = 0, n = aoa.length;
+	for(var i = 0; i < n; ++i) {
+		x_ += aoa[i][0] / n;
+		y_ += aoa[i][1] / n;
+		xx += aoa[i][0] * aoa[i][0];
+		xy += aoa[i][0] * aoa[i][1];
+	}
+	var m = Math.fround((xy - n * x_ * y_)/(xx - n * x_ * x_));
+	console.log(m, Math.fround(y_ - m * x_), "JS Post");
+})(aoa);
+
+/* build X and Y vectors */
+var tensor = tf.tensor2d(aoa).transpose();
+console.log(tensor.shape);
+var xs = tensor.slice([0,0], [1,tensor.shape[1]]).flatten();
+var ys = tensor.slice([1,0], [1,tensor.shape[1]]).flatten();
+
+/* set up variables with initial guess */
+var x_ = xs.mean().dataSync()[0];
+var y_ = ys.mean().dataSync()[0];
+var a = tf.variable(tf.scalar(y_/x_));
+var b = tf.variable(tf.scalar(Math.random()));
+
+/* linear predictor */
+function predict(x) { return tf.tidy(function() { return a.mul(x).add(b); }); }
+/* mean square scoring */
+function loss(yh, y) { return yh.sub(y).square().mean(); }
+
+/* train */
+for(var j = 0; j < 5; ++j) {
+	var learning_rate = 0.0001 /(j+1), iterations = 1000;
+	var optimizer = tf.train.sgd(learning_rate);
+
+	for(var i = 0; i < iterations; ++i) optimizer.minimize(function() {
+		var pred = predict(xs);
+		var L = loss(pred, ys);
+		return L
+	});
+
+	/* compute the coefficient */
+	var m = a.dataSync()[0], b_ = b.dataSync()[0];
+	console.log(m, b_, "TF " + iterations * (j+1));
+}
+
+/* export data to aoa */
+var yh = predict(xs);
+var tfdata = tf.stack([xs, ys, yh]).transpose();
+var shape = tfdata.shape;
+var tfarr = tfdata.dataSync();
+var tfaoa = [];
+for(j = 0; j < shape[0]; ++j) {
+	tfaoa[j] = [];
+	for(i = 0; i < shape[1]; ++i) tfaoa[j][i] = tfarr[j * shape[1] + i];
+}
+
+/* add headers and export */
+tfaoa.unshift(["x", "y", "pred"]);
+var new_ws = XLSX.utils.aoa_to_sheet(tfaoa);
+var new_wb = XLSX.utils.book_new();
+XLSX.utils.book_append_sheet(new_wb, new_ws, "Sheet1");
+XLSX.writeFile(new_wb, "tfjs.xls");
--- a/demos/chrome/popup.js
+++ b/demos/chrome/popup.js
@ -28,4 +28,4 @@ document.getElementById('sjsdownload').addEventListener('click', function() {
    XLSX.utils.book_append_sheet(wb, ws, 'Bookmarks');
    XLSX.writeFile(wb, "bookmarks.xlsx");
  });
-});
+});
--- a/demos/chrome/table.js
+++ b/demos/chrome/table.js
@ -38,6 +38,6 @@ chrome.runtime.onInstalled.addListener(function() {
 });

 function sjsexport_cb(wb) {
-	if(!wb || !wb.SheetNames || !wb.Sheets) { console.log(wb); return alert("Error in exporting table"); }
+	if(!wb || !wb.SheetNames || !wb.Sheets) { return alert("Error in exporting table"); }
 	XLSX.writeFile(wb, "export.xlsx");
-}
+}
--- a/dist/xlsx.core.min.js
+++ b/dist/xlsx.core.min.js
--- a/dist/xlsx.core.min.map
+++ b/dist/xlsx.core.min.map
--- a/dist/xlsx.extendscript.js
+++ b/dist/xlsx.extendscript.js
@ -9141,7 +9141,7 @@ module.exports = ZStream;
 /*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false */
 var XLSX = {};
 (function make_xlsx(XLSX){
-XLSX.version = '0.12.7';
+XLSX.version = '0.12.8';
 var current_codepage = 1200, current_ansi = 1252;
 /*global cptable:true */
 if(typeof module !== "undefined" && typeof require !== 'undefined') {
@ -15055,6 +15055,7 @@ var fields = [], field = ({});
 		}
 	}
 	if(ft != 0x02) if(d.l < d.length && d[d.l++] != 0x1A) throw new Error("DBF EOF Marker missing " + (d.l-1) + " of " + d.length + " " + d[d.l-1].toString(16));
+	if(opts && opts.sheetRows) out = out.slice(0, opts.sheetRows);
 	return out;
 }

@ -15081,7 +15082,8 @@ function sheet_to_dbf(ws, opts) {
 	for(i = 0; i < headers.length; ++i) {
 		if(i == null) continue;
 		++hcnt;
-		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name");
+		if(typeof headers[i] === 'number') headers[i] = headers[i].toString(10);
+		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name " + headers[i] + " |" + (typeof headers[i]) + "|");
 		if(headers.indexOf(headers[i]) !== i) for(j=0; j<1024;++j)
 			if(headers.indexOf(headers[i] + "_" + j) == -1) { headers[i] += "_" + j; break; }
 	}
@ -15269,6 +15271,7 @@ var SYLK = (function() {
 		}
 		if(rowinfo.length > 0) sht['!rows'] = rowinfo;
 		if(colinfo.length > 0) sht['!cols'] = colinfo;
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return [arr, sht];
 	}

@ -15359,7 +15362,7 @@ var DIF = (function() {
 		}
 		throw new Error("Unrecognized type " + opts.type);
 	}
-	function dif_to_aoa_str(str) {
+	function dif_to_aoa_str(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			if (records[ri].trim() === 'BOT') { arr[++R] = []; C = 0; continue; }
@ -15387,6 +15390,7 @@ var DIF = (function() {
 			}
 			if (data === 'EOD') break;
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -15460,7 +15464,7 @@ var ETH = (function() {
 	function decode(s) { return s.replace(/\\b/g,"\\").replace(/\\c/g,":").replace(/\\n/g,"\n"); }
 	function encode(s) { return s.replace(/\\/g, "\\b").replace(/:/g, "\\c").replace(/\n/g,"\\n"); }

-	function eth_to_aoa(str) {
+	function eth_to_aoa(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			var record = records[ri].trim().split(":");
@ -15481,6 +15485,7 @@ var ETH = (function() {
 					if(record[2] == 'vtf') arr[R][C] = [arr[R][C], _f];
 			}
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -15588,6 +15593,7 @@ var PRN = (function() {
 			for(C = 1; C <= (lines[R].length - start)/10 + 1; ++C)
 				set_text_arr(lines[R].slice(start+(C-1)*10,start+C*10).trim(),arr,R,C,o);
 		}
+		if(o.sheetRows) arr = arr.slice(0, o.sheetRows);
 		return arr;
 	}

@ -15674,11 +15680,11 @@ var PRN = (function() {
 			start = end+1;
 			if(range.e.c < C) range.e.c = C;
 			if(range.e.r < R) range.e.r = R;
-			if(cc == sepcc) ++C; else { C = 0; ++R; }
+			if(cc == sepcc) ++C; else { C = 0; ++R; if(o.sheetRows && o.sheetRows <= R) return true; }
 		}
-		for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
+		outer: for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
 			case 0x22: instr = !instr; break;
-			case sepcc: case 0x0a: case 0x0d: if(!instr) finish_cell(); break;
+			case sepcc: case 0x0a: case 0x0d: if(!instr && finish_cell()) break outer; break;
 			default: break;
 		}
 		if(end - start > 0) finish_cell();
@ -15777,7 +15783,7 @@ var WK_ = (function() {
 		throw "Unsupported type " + opts.type;
 	}

-	function lotus_to_workbook_buf(d,opts) {
+	function lotus_to_workbook_buf(d, opts) {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
@ -15785,6 +15791,7 @@ var WK_ = (function() {
 		var sheets = {}, snames = [n];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
+		var sheetRows = o.sheetRows || 0;

 		if(d[2] == 0x02) o.Enum = WK1Enum;
 		else if(d[2] == 0x1a) o.Enum = WK3Enum;
@ -15832,6 +15839,7 @@ var WK_ = (function() {
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 						snames.push(n);
 					}
+					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
 						if(!s[val[0].r]) s[val[0].r] = [];
 						s[val[0].r][val[0].c] = val[1];
@ -21033,7 +21041,7 @@ function parse_ws_xml(data, opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -22181,7 +22189,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && (refguess.s.r < 2000000 || ref && (ref.e.r > 0 || ref.e.c > 0 || ref.s.r > 0 || ref.s.c > 0))) s["!ref"] = encode_range(ref || refguess);
 	if(opts.sheetRows && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -23556,7 +23564,14 @@ for(var cma = c; cma <= cc; ++cma) {
 			if(Rn[1]==='/'){
 				if((tmp=state.pop())[0]!==Rn[3]) throw new Error("Bad state: "+tmp.join("|"));
 				sheetnames.push(sheetname);
-				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) cursheet["!ref"] = encode_range(refguess);
+				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) {
+					cursheet["!ref"] = encode_range(refguess);
+					if(opts.sheetRows && opts.sheetRows <= refguess.e.r) {
+						cursheet["!fullref"] = cursheet["!ref"];
+						refguess.e.r = opts.sheetRows - 1;
+						cursheet["!ref"] = encode_range(refguess);
+					}
+				}
 				if(merges.length) cursheet["!merges"] = merges;
 				if(cstys.length > 0) cursheet["!cols"] = cstys;
 				if(rowinfo.length > 0) cursheet["!rows"] = rowinfo;
@ -24555,6 +24570,7 @@ function parse_workbook(blob, options) {
 	};
 	var addcell = function addcell(cell, line, options) {
 		if(file_depth > 1) return;
+		if(options.sheetRows && cell.r >= options.sheetRows) cell_valid = false;
 		if(!cell_valid) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -24578,8 +24594,7 @@ function parse_workbook(blob, options) {
 				break;
 			}
 		}
-		if(options.sheetRows && lastcell.r >= options.sheetRows) cell_valid = false;
-		else {
+		{
 			if(options.dense) {
 				if(!out[cell.r]) out[cell.r] = [];
 				out[cell.r][cell.c] = line;
@ -24744,6 +24759,13 @@ wb.opts.Date1904 = Workbook.WBProps.date1904 = val; break;
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
 							out["!ref"] = encode_range(range);
+							if(options.sheetRows && options.sheetRows <= range.e.r) {
+								var tmpri = range.e.r;
+								range.e.r = options.sheetRows - 1;
+								out["!fullref"] = out["!ref"];
+								out["!ref"] = encode_range(range);
+								range.e.r = tmpri;
+							}
 							range.e.r++; range.e.c++;
 						}
 						if(merges.length > 0) out["!merges"] = merges;
@ -26933,7 +26955,7 @@ var HTML_ = (function() {
 		for(i = 0; i < rows.length; ++i) {
 			var row = rows[i].trim();
 			var hd = row.slice(0,3).toLowerCase();
-			if(hd == "<tr") { ++R; C = 0; continue; }
+			if(hd == "<tr") { ++R; if(opts.sheetRows && opts.sheetRows <= R) { --R; break; } C = 0; continue; }
 			if(hd != "<td") continue;
 			var cells = row.split(/<\/td>/i);
 			for(j = 0; j < cells.length; ++j) {
@ -27037,10 +27059,11 @@ function parse_dom_table(table, _opts) {
 	if(DENSE != null) opts.dense = DENSE;
 	var ws = opts.dense ? ([]) : ({});
 	var rows = table.getElementsByTagName('tr');
-	var range = {s:{r:0,c:0},e:{r:rows.length - 1,c:0}};
+	var sheetRows = Math.min(opts.sheetRows||10000000, rows.length);
+	var range = {s:{r:0,c:0},e:{r:sheetRows - 1,c:0}};
 	var merges = [], midx = 0;
 	var R = 0, _C = 0, C = 0, RS = 0, CS = 0;
-	for(; R < rows.length; ++R) {
+	for(; R < sheetRows; ++R) {
 		var row = rows[R];
 		var elts = (row.children);
 		for(_C = C = 0; _C < elts.length; ++_C) {
@ -27074,6 +27097,7 @@ function parse_dom_table(table, _opts) {
 	}
 	ws['!merges'] = merges;
 	ws['!ref'] = encode_range(range);
+	if(sheetRows < rows.length) ws['!fullref'] = encode_range((range.e.r = rows.length-1,range));
 	return ws;
 }

@ -27144,6 +27168,11 @@ var parse_content_xml = (function() {
 			case 'table': case '工作表': // 9.1.2 <table:table>
 				if(Rn[1]==='/') {
 					if(range.e.c >= range.s.c && range.e.r >= range.s.r) ws['!ref'] = encode_range(range);
+					if(opts.sheetRows > 0 && opts.sheetRows <= range.e.r) {
+						ws['!fullref'] = ws['!ref'];
+						range.e.r = opts.sheetRows - 1;
+						ws['!ref'] = encode_range(range);
+					}
 					if(merges.length) ws['!merges'] = merges;
 					if(rowinfo.length) ws["!rows"] = rowinfo;
 					sheetag.name = utf8read(sheetag['名称'] || sheetag.name);
@ -27260,7 +27289,7 @@ var parse_content_xml = (function() {
 					if(comments.length > 0) { q.c = comments; comments = []; }
 					if(textp && opts.cellText !== false) q.w = textp;
 					if(!isstub || opts.sheetStubs) {
-						if(!(opts.sheetRows && opts.sheetRows < R)) {
+						if(!(opts.sheetRows && opts.sheetRows <= R)) {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {
--- a/dist/xlsx.full.min.js
+++ b/dist/xlsx.full.min.js
--- a/dist/xlsx.full.min.map
+++ b/dist/xlsx.full.min.map
--- a/dist/xlsx.js
+++ b/dist/xlsx.js
@ -4,7 +4,7 @@
 /*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false */
 var XLSX = {};
 (function make_xlsx(XLSX){
-XLSX.version = '0.12.7';
+XLSX.version = '0.12.8';
 var current_codepage = 1200, current_ansi = 1252;
 /*global cptable:true */
 if(typeof module !== "undefined" && typeof require !== 'undefined') {
@ -5918,6 +5918,7 @@ var fields = [], field = ({});
 		}
 	}
 	if(ft != 0x02) if(d.l < d.length && d[d.l++] != 0x1A) throw new Error("DBF EOF Marker missing " + (d.l-1) + " of " + d.length + " " + d[d.l-1].toString(16));
+	if(opts && opts.sheetRows) out = out.slice(0, opts.sheetRows);
 	return out;
 }

@ -5944,7 +5945,8 @@ function sheet_to_dbf(ws, opts) {
 	for(i = 0; i < headers.length; ++i) {
 		if(i == null) continue;
 		++hcnt;
-		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name");
+		if(typeof headers[i] === 'number') headers[i] = headers[i].toString(10);
+		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name " + headers[i] + " |" + (typeof headers[i]) + "|");
 		if(headers.indexOf(headers[i]) !== i) for(j=0; j<1024;++j)
 			if(headers.indexOf(headers[i] + "_" + j) == -1) { headers[i] += "_" + j; break; }
 	}
@ -6132,6 +6134,7 @@ var SYLK = (function() {
 		}
 		if(rowinfo.length > 0) sht['!rows'] = rowinfo;
 		if(colinfo.length > 0) sht['!cols'] = colinfo;
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return [arr, sht];
 	}

@ -6222,7 +6225,7 @@ var DIF = (function() {
 		}
 		throw new Error("Unrecognized type " + opts.type);
 	}
-	function dif_to_aoa_str(str) {
+	function dif_to_aoa_str(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			if (records[ri].trim() === 'BOT') { arr[++R] = []; C = 0; continue; }
@ -6250,6 +6253,7 @@ var DIF = (function() {
 			}
 			if (data === 'EOD') break;
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6323,7 +6327,7 @@ var ETH = (function() {
 	function decode(s) { return s.replace(/\\b/g,"\\").replace(/\\c/g,":").replace(/\\n/g,"\n"); }
 	function encode(s) { return s.replace(/\\/g, "\\b").replace(/:/g, "\\c").replace(/\n/g,"\\n"); }

-	function eth_to_aoa(str) {
+	function eth_to_aoa(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			var record = records[ri].trim().split(":");
@ -6344,6 +6348,7 @@ var ETH = (function() {
 					if(record[2] == 'vtf') arr[R][C] = [arr[R][C], _f];
 			}
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6451,6 +6456,7 @@ var PRN = (function() {
 			for(C = 1; C <= (lines[R].length - start)/10 + 1; ++C)
 				set_text_arr(lines[R].slice(start+(C-1)*10,start+C*10).trim(),arr,R,C,o);
 		}
+		if(o.sheetRows) arr = arr.slice(0, o.sheetRows);
 		return arr;
 	}

@ -6537,11 +6543,11 @@ var PRN = (function() {
 			start = end+1;
 			if(range.e.c < C) range.e.c = C;
 			if(range.e.r < R) range.e.r = R;
-			if(cc == sepcc) ++C; else { C = 0; ++R; }
+			if(cc == sepcc) ++C; else { C = 0; ++R; if(o.sheetRows && o.sheetRows <= R) return true; }
 		}
-		for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
+		outer: for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
 			case 0x22: instr = !instr; break;
-			case sepcc: case 0x0a: case 0x0d: if(!instr) finish_cell(); break;
+			case sepcc: case 0x0a: case 0x0d: if(!instr && finish_cell()) break outer; break;
 			default: break;
 		}
 		if(end - start > 0) finish_cell();
@ -6640,7 +6646,7 @@ var WK_ = (function() {
 		throw "Unsupported type " + opts.type;
 	}

-	function lotus_to_workbook_buf(d,opts) {
+	function lotus_to_workbook_buf(d, opts) {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
@ -6648,6 +6654,7 @@ var WK_ = (function() {
 		var sheets = {}, snames = [n];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
+		var sheetRows = o.sheetRows || 0;

 		if(d[2] == 0x02) o.Enum = WK1Enum;
 		else if(d[2] == 0x1a) o.Enum = WK3Enum;
@ -6695,6 +6702,7 @@ var WK_ = (function() {
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 						snames.push(n);
 					}
+					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
 						if(!s[val[0].r]) s[val[0].r] = [];
 						s[val[0].r][val[0].c] = val[1];
@ -11896,7 +11904,7 @@ function parse_ws_xml(data, opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -13044,7 +13052,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && (refguess.s.r < 2000000 || ref && (ref.e.r > 0 || ref.e.c > 0 || ref.s.r > 0 || ref.s.c > 0))) s["!ref"] = encode_range(ref || refguess);
 	if(opts.sheetRows && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -14419,7 +14427,14 @@ for(var cma = c; cma <= cc; ++cma) {
 			if(Rn[1]==='/'){
 				if((tmp=state.pop())[0]!==Rn[3]) throw new Error("Bad state: "+tmp.join("|"));
 				sheetnames.push(sheetname);
-				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) cursheet["!ref"] = encode_range(refguess);
+				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) {
+					cursheet["!ref"] = encode_range(refguess);
+					if(opts.sheetRows && opts.sheetRows <= refguess.e.r) {
+						cursheet["!fullref"] = cursheet["!ref"];
+						refguess.e.r = opts.sheetRows - 1;
+						cursheet["!ref"] = encode_range(refguess);
+					}
+				}
 				if(merges.length) cursheet["!merges"] = merges;
 				if(cstys.length > 0) cursheet["!cols"] = cstys;
 				if(rowinfo.length > 0) cursheet["!rows"] = rowinfo;
@ -15418,6 +15433,7 @@ function parse_workbook(blob, options) {
 	};
 	var addcell = function addcell(cell, line, options) {
 		if(file_depth > 1) return;
+		if(options.sheetRows && cell.r >= options.sheetRows) cell_valid = false;
 		if(!cell_valid) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -15441,8 +15457,7 @@ function parse_workbook(blob, options) {
 				break;
 			}
 		}
-		if(options.sheetRows && lastcell.r >= options.sheetRows) cell_valid = false;
-		else {
+		{
 			if(options.dense) {
 				if(!out[cell.r]) out[cell.r] = [];
 				out[cell.r][cell.c] = line;
@ -15607,6 +15622,13 @@ wb.opts.Date1904 = Workbook.WBProps.date1904 = val; break;
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
 							out["!ref"] = encode_range(range);
+							if(options.sheetRows && options.sheetRows <= range.e.r) {
+								var tmpri = range.e.r;
+								range.e.r = options.sheetRows - 1;
+								out["!fullref"] = out["!ref"];
+								out["!ref"] = encode_range(range);
+								range.e.r = tmpri;
+							}
 							range.e.r++; range.e.c++;
 						}
 						if(merges.length > 0) out["!merges"] = merges;
@ -17796,7 +17818,7 @@ var HTML_ = (function() {
 		for(i = 0; i < rows.length; ++i) {
 			var row = rows[i].trim();
 			var hd = row.slice(0,3).toLowerCase();
-			if(hd == "<tr") { ++R; C = 0; continue; }
+			if(hd == "<tr") { ++R; if(opts.sheetRows && opts.sheetRows <= R) { --R; break; } C = 0; continue; }
 			if(hd != "<td") continue;
 			var cells = row.split(/<\/td>/i);
 			for(j = 0; j < cells.length; ++j) {
@ -17900,10 +17922,11 @@ function parse_dom_table(table, _opts) {
 	if(DENSE != null) opts.dense = DENSE;
 	var ws = opts.dense ? ([]) : ({});
 	var rows = table.getElementsByTagName('tr');
-	var range = {s:{r:0,c:0},e:{r:rows.length - 1,c:0}};
+	var sheetRows = Math.min(opts.sheetRows||10000000, rows.length);
+	var range = {s:{r:0,c:0},e:{r:sheetRows - 1,c:0}};
 	var merges = [], midx = 0;
 	var R = 0, _C = 0, C = 0, RS = 0, CS = 0;
-	for(; R < rows.length; ++R) {
+	for(; R < sheetRows; ++R) {
 		var row = rows[R];
 		var elts = (row.children);
 		for(_C = C = 0; _C < elts.length; ++_C) {
@ -17937,6 +17960,7 @@ function parse_dom_table(table, _opts) {
 	}
 	ws['!merges'] = merges;
 	ws['!ref'] = encode_range(range);
+	if(sheetRows < rows.length) ws['!fullref'] = encode_range((range.e.r = rows.length-1,range));
 	return ws;
 }

@ -18007,6 +18031,11 @@ var parse_content_xml = (function() {
 			case 'table': case '工作表': // 9.1.2 <table:table>
 				if(Rn[1]==='/') {
 					if(range.e.c >= range.s.c && range.e.r >= range.s.r) ws['!ref'] = encode_range(range);
+					if(opts.sheetRows > 0 && opts.sheetRows <= range.e.r) {
+						ws['!fullref'] = ws['!ref'];
+						range.e.r = opts.sheetRows - 1;
+						ws['!ref'] = encode_range(range);
+					}
 					if(merges.length) ws['!merges'] = merges;
 					if(rowinfo.length) ws["!rows"] = rowinfo;
 					sheetag.name = utf8read(sheetag['名称'] || sheetag.name);
@ -18123,7 +18152,7 @@ var parse_content_xml = (function() {
 					if(comments.length > 0) { q.c = comments; comments = []; }
 					if(textp && opts.cellText !== false) q.w = textp;
 					if(!isstub || opts.sheetStubs) {
-						if(!(opts.sheetRows && opts.sheetRows < R)) {
+						if(!(opts.sheetRows && opts.sheetRows <= R)) {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {
--- a/dist/xlsx.min.js
+++ b/dist/xlsx.min.js
--- a/dist/xlsx.min.map
+++ b/dist/xlsx.min.map
--- a/docbits/11_demos.md
+++ b/docbits/11_demos.md
@ -11,6 +11,7 @@ The [`demos` directory](demos/) includes sample projects for:
 - [`XMLHttpRequest and fetch`](demos/xhr/)
 - [`nodejs server`](demos/server/)
 - [`databases and key/value stores`](demos/database/)
+- [`typed arrays and math`](demos/array/)

 **Bundlers and Tooling**
 - [`browserify`](demos/browserify/)
--- a/docbits/82_util.md
+++ b/docbits/82_util.md
@ -212,9 +212,10 @@ Both functions accept options arguments:

 | Option Name |  Default | Description                                         |
 | :---------- | :------: | :-------------------------------------------------- |
+|`raw`        |          | If true, every cell will hold raw strings           |
 |`dateNF`     |  FMT 14  | Use specified date format in string output          |
 |`cellDates`  |  false   | Store dates as type `d` (default is `n`)            |
-|`raw`        |          | If true, every cell will hold raw strings           |
+|`sheetRows`  |    0     | If >0, read the first `sheetRows` rows of the table |


 <details>
--- a/misc/docs/README.md
+++ b/misc/docs/README.md
@ -189,6 +189,7 @@ The [`demos` directory](demos/) includes sample projects for:
 - [`XMLHttpRequest and fetch`](demos/xhr/)
 - [`nodejs server`](demos/server/)
 - [`databases and key/value stores`](demos/database/)
+- [`typed arrays and math`](demos/array/)

 **Bundlers and Tooling**
 - [`browserify`](demos/browserify/)
@ -1886,9 +1887,10 @@ Both functions accept options arguments:

 | Option Name |  Default | Description                                         |
 | :---------- | :------: | :-------------------------------------------------- |
+|`raw`        |          | If true, every cell will hold raw strings           |
 |`dateNF`     |  FMT 14  | Use specified date format in string output          |
 |`cellDates`  |  false   | Store dates as type `d` (default is `n`)            |
-|`raw`        |          | If true, every cell will hold raw strings           |
+|`sheetRows`  |    0     | If >0, read the first `sheetRows` rows of the table |



--- a/package.json
+++ b/package.json
@ -1,6 +1,6 @@
 {
 	"name": "xlsx",
-	"version": "0.12.7",
+	"version": "0.12.8",
 	"author": "sheetjs",
 	"description": "SheetJS Spreadsheet data parser and writer",
 	"keywords": [
--- a/test.js
+++ b/test.js
@ -26,7 +26,7 @@ var opts = ({cellNF: true}/*:any*/);
 var TYPE = browser ? "binary" : "buffer";
 opts.type = TYPE;
 var fullex = [".xlsb", /*".xlsm",*/ ".xlsx"/*, ".xlml", ".xls"*/];
-var ofmt = ["xlsb", "xlsm", "xlsx", "ods", "biff2", "biff5", "biff8", "xlml", "sylk", "dif", "dbf", "eth"];
+var ofmt = ["xlsb", "xlsm", "xlsx", "ods", "biff2", "biff5", "biff8", "xlml", "sylk", "dif", "dbf", "eth", "fods", "csv", "txt", "html"];
 var ex = fullex.slice(); ex = ex.concat([".ods", ".xls", ".xml", ".fods"]);
 if(typeof process != 'undefined' && ((process||{}).env)) {
 	opts.WTF = true;
@ -540,6 +540,45 @@ describe('parse options', function() {
 		it('sheetRows n=10', function() { FSTPaths.forEach(function(p) {
 			checkcells(X.read(fs.readFileSync(p), {type:TYPE, sheetRows:10}), false, false, false, true);
 		}); });
+		it('sheetRows n=1', function() { ofmt.forEach(function(fmt) {
+			var data = [[1,2],[3,4],[5,6]];
+			var ws = X.utils.aoa_to_sheet(data);
+			assert(ws['!ref'] === "A1:B3");
+			var wb = X.utils.book_new();
+			X.utils.book_append_sheet(wb, ws, "Sheet1");
+			var bs = X.write(wb, { bookType: fmt, type: "binary" });
+
+			var wb0 = X.read(bs, { type: "binary" });
+			var ws0 = wb0.Sheets.Sheet1;
+			assert.equal(ws0['!ref'], "A1:B3");
+			assert.equal(get_cell(ws0, "A1").v, 1);
+			assert.equal(get_cell(ws0, "B2").v, 4);
+			assert.equal(get_cell(ws0, "A3").v, 5);
+
+			var wb1 = X.read(bs, { type: "binary", sheetRows: 1 });
+			var ws1 = wb1.Sheets.Sheet1;
+			assert.equal(ws1['!ref'], "A1:B1");
+			assert.equal(get_cell(ws1, "A1").v, 1);
+			assert(!get_cell(ws1, "B2"));
+			assert(!get_cell(ws1, "A3"));
+			if(ws1['!fullref']) assert.equal(ws1['!fullref'], "A1:B3");
+
+			var wb2 = X.read(bs, { type: "binary", sheetRows: 2 });
+			var ws2 = wb2.Sheets.Sheet1;
+			assert.equal(ws2['!ref'], "A1:B2");
+			assert.equal(get_cell(ws2, "A1").v, 1);
+			assert.equal(get_cell(ws2, "B2").v, 4);
+			assert(!get_cell(ws2, "A3"));
+			if(ws2['!fullref']) assert.equal(ws2['!fullref'], "A1:B3");
+
+			var wb3 = X.read(bs, { type: "binary", sheetRows: 3 });
+			var ws3 = wb3.Sheets.Sheet1;
+			assert.equal(ws3['!ref'], "A1:B3");
+			assert.equal(get_cell(ws3, "A1").v, 1);
+			assert.equal(get_cell(ws3, "B2").v, 4);
+			assert.equal(get_cell(ws3, "A3").v, 5);
+			if(ws3['!fullref']) assert.equal(ws3['!fullref'], "A1:B3");
+		}); });
 	});
 	describe('book', function() {
 		it('bookSheets should not generate sheets', function() {
@ -1981,6 +2020,17 @@ describe('HTML', function() {
 		assert.equal(get_cell(ws, "A1").v, "A&B");
 		assert.equal(get_cell(ws, "B1").v, "A·B");
 	});
+	if(domtest) it('should honor sheetRows', function() {
+		var html = X.utils.sheet_to_html(X.utils.aoa_to_sheet([[1,2],[3,4],[5,6]]));
+		var ws = X.utils.table_to_sheet(get_dom_element(html));
+		assert.equal(ws['!ref'], "A1:B3");
+		ws = X.utils.table_to_sheet(get_dom_element(html), {sheetRows:1});
+		assert.equal(ws['!ref'], "A1:B1");
+		assert.equal(ws['!fullref'], "A1:B3");
+		ws = X.utils.table_to_sheet(get_dom_element(html), {sheetRows:2});
+		assert.equal(ws['!ref'], "A1:B2");
+		assert.equal(ws['!fullref'], "A1:B3");
+	});
 	describe('type override', function() {
 		function chk(ws) {
 			assert.equal(get_cell(ws, "A1").t, "s");
@ -2025,7 +2075,7 @@ describe('js -> file -> js', function() {
 			['C2', 'C3'].forEach(cb); /* string */
 			if(!DIF_XL) cb('D4'); /* date */
 			if(DIF_XL && f == "dif") assert.equal(get_cell(newwb.Sheets.Sheet1, 'C5').v, '=""0.3""');// dif forces string formula
-			else eqcell(wb, newwb, 'Sheet1', 'C5');
+			else if(f != 'csv' && f != 'txt') eqcell(wb, newwb, 'Sheet1', 'C5');
 		});
 	});
 });
--- a/tests/core.js
+++ b/tests/core.js
@ -26,7 +26,7 @@ var opts = ({cellNF: true}/*:any*/);
 var TYPE = browser ? "binary" : "buffer";
 opts.type = TYPE;
 var fullex = [".xlsb", /*".xlsm",*/ ".xlsx"/*, ".xlml", ".xls"*/];
-var ofmt = ["xlsb", "xlsm", "xlsx", "ods", "biff2", "biff5", "biff8", "xlml", "sylk", "dif", "dbf", "eth"];
+var ofmt = ["xlsb", "xlsm", "xlsx", "ods", "biff2", "biff5", "biff8", "xlml", "sylk", "dif", "dbf", "eth", "fods", "csv", "txt", "html"];
 var ex = fullex.slice(); ex = ex.concat([".ods", ".xls", ".xml", ".fods"]);
 if(typeof process != 'undefined' && ((process||{}).env)) {
 	opts.WTF = true;
@ -540,6 +540,45 @@ describe('parse options', function() {
 		it('sheetRows n=10', function() { FSTPaths.forEach(function(p) {
 			checkcells(X.read(fs.readFileSync(p), {type:TYPE, sheetRows:10}), false, false, false, true);
 		}); });
+		it('sheetRows n=1', function() { ofmt.forEach(function(fmt) {
+			var data = [[1,2],[3,4],[5,6]];
+			var ws = X.utils.aoa_to_sheet(data);
+			assert(ws['!ref'] === "A1:B3");
+			var wb = X.utils.book_new();
+			X.utils.book_append_sheet(wb, ws, "Sheet1");
+			var bs = X.write(wb, { bookType: fmt, type: "binary" });
+
+			var wb0 = X.read(bs, { type: "binary" });
+			var ws0 = wb0.Sheets.Sheet1;
+			assert.equal(ws0['!ref'], "A1:B3");
+			assert.equal(get_cell(ws0, "A1").v, 1);
+			assert.equal(get_cell(ws0, "B2").v, 4);
+			assert.equal(get_cell(ws0, "A3").v, 5);
+
+			var wb1 = X.read(bs, { type: "binary", sheetRows: 1 });
+			var ws1 = wb1.Sheets.Sheet1;
+			assert.equal(ws1['!ref'], "A1:B1");
+			assert.equal(get_cell(ws1, "A1").v, 1);
+			assert(!get_cell(ws1, "B2"));
+			assert(!get_cell(ws1, "A3"));
+			if(ws1['!fullref']) assert.equal(ws1['!fullref'], "A1:B3");
+
+			var wb2 = X.read(bs, { type: "binary", sheetRows: 2 });
+			var ws2 = wb2.Sheets.Sheet1;
+			assert.equal(ws2['!ref'], "A1:B2");
+			assert.equal(get_cell(ws2, "A1").v, 1);
+			assert.equal(get_cell(ws2, "B2").v, 4);
+			assert(!get_cell(ws2, "A3"));
+			if(ws2['!fullref']) assert.equal(ws2['!fullref'], "A1:B3");
+
+			var wb3 = X.read(bs, { type: "binary", sheetRows: 3 });
+			var ws3 = wb3.Sheets.Sheet1;
+			assert.equal(ws3['!ref'], "A1:B3");
+			assert.equal(get_cell(ws3, "A1").v, 1);
+			assert.equal(get_cell(ws3, "B2").v, 4);
+			assert.equal(get_cell(ws3, "A3").v, 5);
+			if(ws3['!fullref']) assert.equal(ws3['!fullref'], "A1:B3");
+		}); });
 	});
 	describe('book', function() {
 		it('bookSheets should not generate sheets', function() {
@ -1981,6 +2020,17 @@ describe('HTML', function() {
 		assert.equal(get_cell(ws, "A1").v, "A&B");
 		assert.equal(get_cell(ws, "B1").v, "A·B");
 	});
+	if(domtest) it('should honor sheetRows', function() {
+		var html = X.utils.sheet_to_html(X.utils.aoa_to_sheet([[1,2],[3,4],[5,6]]));
+		var ws = X.utils.table_to_sheet(get_dom_element(html));
+		assert.equal(ws['!ref'], "A1:B3");
+		ws = X.utils.table_to_sheet(get_dom_element(html), {sheetRows:1});
+		assert.equal(ws['!ref'], "A1:B1");
+		assert.equal(ws['!fullref'], "A1:B3");
+		ws = X.utils.table_to_sheet(get_dom_element(html), {sheetRows:2});
+		assert.equal(ws['!ref'], "A1:B2");
+		assert.equal(ws['!fullref'], "A1:B3");
+	});
 	describe('type override', function() {
 		function chk(ws) {
 			assert.equal(get_cell(ws, "A1").t, "s");
@ -2025,7 +2075,7 @@ describe('js -> file -> js', function() {
 			['C2', 'C3'].forEach(cb); /* string */
 			if(!DIF_XL) cb('D4'); /* date */
 			if(DIF_XL && f == "dif") assert.equal(get_cell(newwb.Sheets.Sheet1, 'C5').v, '=""0.3""');// dif forces string formula
-			else eqcell(wb, newwb, 'Sheet1', 'C5');
+			else if(f != 'csv' && f != 'txt') eqcell(wb, newwb, 'Sheet1', 'C5');
 		});
 	});
 });
--- a/types/doc.ts
+++ b/types/doc.ts
@ -101,7 +101,8 @@ const tbl = {}; /* document.getElementById('table'); */
 const ws3 = XLSX.utils.table_to_sheet(tbl, {
 	raw: true,
 	cellDates: true,
-	dateNF: "yyyy-mm-dd"
+	dateNF: "yyyy-mm-dd",
+	sheetRows: 1
 });

 const obj1 = XLSX.utils.sheet_to_formulae(ws1);
--- a/types/index.d.ts
+++ b/types/index.d.ts
@ -657,6 +657,12 @@ export interface SheetJSONOpts extends JSON2SheetOpts, OriginOption {}
 export interface Table2SheetOpts extends CommonOptions, DateNFOption {
    /* If true, plaintext parsing will not parse values */
    raw?: boolean;
+
+    /**
+     * If >0, read the first sheetRows rows
+     * @default 0
+     */
+    sheetRows?: number;
 }

 /** General utilities */
--- a/xlsx.flow.js
+++ b/xlsx.flow.js
@ -4,7 +4,7 @@
 /*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false */
 var XLSX = {};
 (function make_xlsx(XLSX){
-XLSX.version = '0.12.7';
+XLSX.version = '0.12.8';
 var current_codepage = 1200, current_ansi = 1252;
 /*:: declare var cptable:any; */
 /*global cptable:true */
@ -6010,6 +6010,7 @@ function dbf_to_aoa(buf, opts)/*:AOA*/ {
 		}
 	}
 	if(ft != 0x02) if(d.l < d.length && d[d.l++] != 0x1A) throw new Error("DBF EOF Marker missing " + (d.l-1) + " of " + d.length + " " + d[d.l-1].toString(16));
+	if(opts && opts.sheetRows) out = out.slice(0, opts.sheetRows);
 	return out;
 }

@ -6036,7 +6037,8 @@ function sheet_to_dbf(ws/*:Worksheet*/, opts/*:WriteOpts*/) {
 	for(i = 0; i < headers.length; ++i) {
 		if(i == null) continue;
 		++hcnt;
-		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name");
+		if(typeof headers[i] === 'number') headers[i] = headers[i].toString(10);
+		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name " + headers[i] + " |" + (typeof headers[i]) + "|");
 		if(headers.indexOf(headers[i]) !== i) for(j=0; j<1024;++j)
 			if(headers.indexOf(headers[i] + "_" + j) == -1) { headers[i] += "_" + j; break; }
 	}
@ -6224,6 +6226,7 @@ var SYLK = (function() {
 		}
 		if(rowinfo.length > 0) sht['!rows'] = rowinfo;
 		if(colinfo.length > 0) sht['!cols'] = colinfo;
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return [arr, sht];
 	}

@ -6314,7 +6317,7 @@ var DIF = (function() {
 		}
 		throw new Error("Unrecognized type " + opts.type);
 	}
-	function dif_to_aoa_str(str/*:string*//*::, opts*/)/*:AOA*/ {
+	function dif_to_aoa_str(str/*:string*/, opts)/*:AOA*/ {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr/*:AOA*/ = [];
 		for (; ri !== records.length; ++ri) {
 			if (records[ri].trim() === 'BOT') { arr[++R] = []; C = 0; continue; }
@ -6342,6 +6345,7 @@ var DIF = (function() {
 			}
 			if (data === 'EOD') break;
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6415,7 +6419,7 @@ var ETH = (function() {
 	function decode(s/*:string*/)/*:string*/ { return s.replace(/\\b/g,"\\").replace(/\\c/g,":").replace(/\\n/g,"\n"); }
 	function encode(s/*:string*/)/*:string*/ { return s.replace(/\\/g, "\\b").replace(/:/g, "\\c").replace(/\n/g,"\\n"); }

-	function eth_to_aoa(str/*:string*//*::, opts*/)/*:AOA*/ {
+	function eth_to_aoa(str/*:string*/, opts)/*:AOA*/ {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr/*:AOA*/ = [];
 		for (; ri !== records.length; ++ri) {
 			var record = records[ri].trim().split(":");
@ -6436,6 +6440,7 @@ var ETH = (function() {
 					if(record[2] == 'vtf') arr[R][C] = [arr[R][C], _f];
 			}
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6543,6 +6548,7 @@ var PRN = (function() {
 			for(C = 1; C <= (lines[R].length - start)/10 + 1; ++C)
 				set_text_arr(lines[R].slice(start+(C-1)*10,start+C*10).trim(),arr,R,C,o);
 		}
+		if(o.sheetRows) arr = arr.slice(0, o.sheetRows);
 		return arr;
 	}

@ -6629,11 +6635,11 @@ var PRN = (function() {
 			start = end+1;
 			if(range.e.c < C) range.e.c = C;
 			if(range.e.r < R) range.e.r = R;
-			if(cc == sepcc) ++C; else { C = 0; ++R; }
+			if(cc == sepcc) ++C; else { C = 0; ++R; if(o.sheetRows && o.sheetRows <= R) return true; }
 		}
-		for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
+		outer: for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
 			case 0x22: instr = !instr; break;
-			case sepcc: case 0x0a: case 0x0d: if(!instr) finish_cell(); break;
+			case sepcc: case 0x0a: case 0x0d: if(!instr && finish_cell()) break outer; break;
 			default: break;
 		}
 		if(end - start > 0) finish_cell();
@ -6732,7 +6738,7 @@ var WK_ = (function() {
 		throw "Unsupported type " + opts.type;
 	}

-	function lotus_to_workbook_buf(d,opts)/*:Workbook*/ {
+	function lotus_to_workbook_buf(d, opts)/*:Workbook*/ {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
@ -6740,6 +6746,7 @@ var WK_ = (function() {
 		var sheets = {}, snames = [n];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
+		var sheetRows = o.sheetRows || 0;

 		if(d[2] == 0x02) o.Enum = WK1Enum;
 		else if(d[2] == 0x1a) o.Enum = WK3Enum;
@ -6787,6 +6794,7 @@ var WK_ = (function() {
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 						snames.push(n);
 					}
+					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
 						if(!s[val[0].r]) s[val[0].r] = [];
 						s[val[0].r][val[0].c] = val[1];
@ -11992,7 +12000,7 @@ function parse_ws_xml(data/*:?string*/, opts, idx/*:number*/, rels, wb/*:WBWBPro
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -13141,7 +13149,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb/*:WBWBProps*/, themes, styles)/
 	if(!s["!ref"] && (refguess.s.r < 2000000 || ref && (ref.e.r > 0 || ref.e.c > 0 || ref.s.r > 0 || ref.s.c > 0))) s["!ref"] = encode_range(ref || refguess);
 	if(opts.sheetRows && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -14521,7 +14529,14 @@ function parse_xlml_xml(d, _opts)/*:Workbook*/ {
 			if(Rn[1]==='/'){
 				if((tmp=state.pop())[0]!==Rn[3]) throw new Error("Bad state: "+tmp.join("|"));
 				sheetnames.push(sheetname);
-				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) cursheet["!ref"] = encode_range(refguess);
+				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) {
+					cursheet["!ref"] = encode_range(refguess);
+					if(opts.sheetRows && opts.sheetRows <= refguess.e.r) {
+						cursheet["!fullref"] = cursheet["!ref"];
+						refguess.e.r = opts.sheetRows - 1;
+						cursheet["!ref"] = encode_range(refguess);
+					}
+				}
 				if(merges.length) cursheet["!merges"] = merges;
 				if(cstys.length > 0) cursheet["!cols"] = cstys;
 				if(rowinfo.length > 0) cursheet["!rows"] = rowinfo;
@ -15526,6 +15541,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 	};
 	var addcell = function addcell(cell/*:any*/, line/*:any*/, options/*:any*/) {
 		if(file_depth > 1) return;
+		if(options.sheetRows && cell.r >= options.sheetRows) cell_valid = false;
 		if(!cell_valid) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -15549,8 +15565,7 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 				break;
 			}
 		}
-		if(options.sheetRows && lastcell.r >= options.sheetRows) cell_valid = false;
-		else {
+		{
 			if(options.dense) {
 				if(!out[cell.r]) out[cell.r] = [];
 				out[cell.r][cell.c] = line;
@ -15716,6 +15731,13 @@ function parse_workbook(blob, options/*:ParseOpts*/)/*:Workbook*/ {
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
 							out["!ref"] = encode_range(range);
+							if(options.sheetRows && options.sheetRows <= range.e.r) {
+								var tmpri = range.e.r;
+								range.e.r = options.sheetRows - 1;
+								out["!fullref"] = out["!ref"];
+								out["!ref"] = encode_range(range);
+								range.e.r = tmpri;
+							}
 							range.e.r++; range.e.c++;
 						}
 						if(merges.length > 0) out["!merges"] = merges;
@ -17907,7 +17929,7 @@ var HTML_ = (function() {
 		for(i = 0; i < rows.length; ++i) {
 			var row = rows[i].trim();
 			var hd = row.slice(0,3).toLowerCase();
-			if(hd == "<tr") { ++R; C = 0; continue; }
+			if(hd == "<tr") { ++R; if(opts.sheetRows && opts.sheetRows <= R) { --R; break; } C = 0; continue; }
 			if(hd != "<td") continue;
 			var cells = row.split(/<\/td>/i);
 			for(j = 0; j < cells.length; ++j) {
@ -18011,10 +18033,11 @@ function parse_dom_table(table/*:HTMLElement*/, _opts/*:?any*/)/*:Worksheet*/ {
 	if(DENSE != null) opts.dense = DENSE;
 	var ws/*:Worksheet*/ = opts.dense ? ([]/*:any*/) : ({}/*:any*/);
 	var rows/*:HTMLCollection<HTMLTableRowElement>*/ = table.getElementsByTagName('tr');
-	var range/*:Range*/ = {s:{r:0,c:0},e:{r:rows.length - 1,c:0}};
+	var sheetRows = Math.min(opts.sheetRows||10000000, rows.length);
+	var range/*:Range*/ = {s:{r:0,c:0},e:{r:sheetRows - 1,c:0}};
 	var merges/*:Array<Range>*/ = [], midx = 0;
 	var R = 0, _C = 0, C = 0, RS = 0, CS = 0;
-	for(; R < rows.length; ++R) {
+	for(; R < sheetRows; ++R) {
 		var row/*:HTMLTableRowElement*/ = rows[R];
 		var elts/*:HTMLCollection<HTMLTableCellElement>*/ = (row.children/*:any*/);
 		for(_C = C = 0; _C < elts.length; ++_C) {
@ -18048,6 +18071,7 @@ function parse_dom_table(table/*:HTMLElement*/, _opts/*:?any*/)/*:Worksheet*/ {
 	}
 	ws['!merges'] = merges;
 	ws['!ref'] = encode_range(range);
+	if(sheetRows < rows.length) ws['!fullref'] = encode_range((range.e.r = rows.length-1,range));
 	return ws;
 }

@ -18118,6 +18142,11 @@ var parse_content_xml = (function() {
 			case 'table': case '工作表': // 9.1.2 <table:table>
 				if(Rn[1]==='/') {
 					if(range.e.c >= range.s.c && range.e.r >= range.s.r) ws['!ref'] = encode_range(range);
+					if(opts.sheetRows > 0 && opts.sheetRows <= range.e.r) {
+						ws['!fullref'] = ws['!ref'];
+						range.e.r = opts.sheetRows - 1;
+						ws['!ref'] = encode_range(range);
+					}
 					if(merges.length) ws['!merges'] = merges;
 					if(rowinfo.length) ws["!rows"] = rowinfo;
 					sheetag.name = utf8read(sheetag['名称'] || sheetag.name);
@ -18234,7 +18263,7 @@ var parse_content_xml = (function() {
 					if(comments.length > 0) { q.c = comments; comments = []; }
 					if(textp && opts.cellText !== false) q.w = textp;
 					if(!isstub || opts.sheetStubs) {
-						if(!(opts.sheetRows && opts.sheetRows < R)) {
+						if(!(opts.sheetRows && opts.sheetRows <= R)) {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {
--- a/xlsx.js
+++ b/xlsx.js
@ -4,7 +4,7 @@
 /*global global, exports, module, require:false, process:false, Buffer:false, ArrayBuffer:false */
 var XLSX = {};
 (function make_xlsx(XLSX){
-XLSX.version = '0.12.7';
+XLSX.version = '0.12.8';
 var current_codepage = 1200, current_ansi = 1252;
 /*global cptable:true */
 if(typeof module !== "undefined" && typeof require !== 'undefined') {
@ -5918,6 +5918,7 @@ var fields = [], field = ({});
 		}
 	}
 	if(ft != 0x02) if(d.l < d.length && d[d.l++] != 0x1A) throw new Error("DBF EOF Marker missing " + (d.l-1) + " of " + d.length + " " + d[d.l-1].toString(16));
+	if(opts && opts.sheetRows) out = out.slice(0, opts.sheetRows);
 	return out;
 }

@ -5944,7 +5945,8 @@ function sheet_to_dbf(ws, opts) {
 	for(i = 0; i < headers.length; ++i) {
 		if(i == null) continue;
 		++hcnt;
-		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name");
+		if(typeof headers[i] === 'number') headers[i] = headers[i].toString(10);
+		if(typeof headers[i] !== 'string') throw new Error("DBF Invalid column name " + headers[i] + " |" + (typeof headers[i]) + "|");
 		if(headers.indexOf(headers[i]) !== i) for(j=0; j<1024;++j)
 			if(headers.indexOf(headers[i] + "_" + j) == -1) { headers[i] += "_" + j; break; }
 	}
@ -6132,6 +6134,7 @@ var SYLK = (function() {
 		}
 		if(rowinfo.length > 0) sht['!rows'] = rowinfo;
 		if(colinfo.length > 0) sht['!cols'] = colinfo;
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return [arr, sht];
 	}

@ -6222,7 +6225,7 @@ var DIF = (function() {
 		}
 		throw new Error("Unrecognized type " + opts.type);
 	}
-	function dif_to_aoa_str(str) {
+	function dif_to_aoa_str(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			if (records[ri].trim() === 'BOT') { arr[++R] = []; C = 0; continue; }
@ -6250,6 +6253,7 @@ var DIF = (function() {
 			}
 			if (data === 'EOD') break;
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6323,7 +6327,7 @@ var ETH = (function() {
 	function decode(s) { return s.replace(/\\b/g,"\\").replace(/\\c/g,":").replace(/\\n/g,"\n"); }
 	function encode(s) { return s.replace(/\\/g, "\\b").replace(/:/g, "\\c").replace(/\n/g,"\\n"); }

-	function eth_to_aoa(str) {
+	function eth_to_aoa(str, opts) {
 		var records = str.split('\n'), R = -1, C = -1, ri = 0, arr = [];
 		for (; ri !== records.length; ++ri) {
 			var record = records[ri].trim().split(":");
@ -6344,6 +6348,7 @@ var ETH = (function() {
 					if(record[2] == 'vtf') arr[R][C] = [arr[R][C], _f];
 			}
 		}
+		if(opts && opts.sheetRows) arr = arr.slice(0, opts.sheetRows);
 		return arr;
 	}

@ -6451,6 +6456,7 @@ var PRN = (function() {
 			for(C = 1; C <= (lines[R].length - start)/10 + 1; ++C)
 				set_text_arr(lines[R].slice(start+(C-1)*10,start+C*10).trim(),arr,R,C,o);
 		}
+		if(o.sheetRows) arr = arr.slice(0, o.sheetRows);
 		return arr;
 	}

@ -6537,11 +6543,11 @@ var PRN = (function() {
 			start = end+1;
 			if(range.e.c < C) range.e.c = C;
 			if(range.e.r < R) range.e.r = R;
-			if(cc == sepcc) ++C; else { C = 0; ++R; }
+			if(cc == sepcc) ++C; else { C = 0; ++R; if(o.sheetRows && o.sheetRows <= R) return true; }
 		}
-		for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
+		outer: for(;end < str.length;++end) switch((cc=str.charCodeAt(end))) {
 			case 0x22: instr = !instr; break;
-			case sepcc: case 0x0a: case 0x0d: if(!instr) finish_cell(); break;
+			case sepcc: case 0x0a: case 0x0d: if(!instr && finish_cell()) break outer; break;
 			default: break;
 		}
 		if(end - start > 0) finish_cell();
@ -6640,7 +6646,7 @@ var WK_ = (function() {
 		throw "Unsupported type " + opts.type;
 	}

-	function lotus_to_workbook_buf(d,opts) {
+	function lotus_to_workbook_buf(d, opts) {
 		if(!d) return d;
 		var o = opts || {};
 		if(DENSE != null && o.dense == null) o.dense = DENSE;
@ -6648,6 +6654,7 @@ var WK_ = (function() {
 		var sheets = {}, snames = [n];

 		var refguess = {s: {r:0, c:0}, e: {r:0, c:0} };
+		var sheetRows = o.sheetRows || 0;

 		if(d[2] == 0x02) o.Enum = WK1Enum;
 		else if(d[2] == 0x1a) o.Enum = WK3Enum;
@ -6695,6 +6702,7 @@ var WK_ = (function() {
 						sidx = val[3]; n = "Sheet" + (sidx + 1);
 						snames.push(n);
 					}
+					if(sheetRows > 0 && val[0].r >= sheetRows) break;
 					if(o.dense) {
 						if(!s[val[0].r]) s[val[0].r] = [];
 						s[val[0].r][val[0].c] = val[1];
@ -11896,7 +11904,7 @@ function parse_ws_xml(data, opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && refguess.e.c >= refguess.s.c && refguess.e.r >= refguess.s.r) s["!ref"] = encode_range(refguess);
 	if(opts.sheetRows > 0 && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -13044,7 +13052,7 @@ function parse_ws_bin(data, _opts, idx, rels, wb, themes, styles) {
 	if(!s["!ref"] && (refguess.s.r < 2000000 || ref && (ref.e.r > 0 || ref.e.c > 0 || ref.s.r > 0 || ref.s.c > 0))) s["!ref"] = encode_range(ref || refguess);
 	if(opts.sheetRows && s["!ref"]) {
 		var tmpref = safe_decode_range(s["!ref"]);
-		if(opts.sheetRows < +tmpref.e.r) {
+		if(opts.sheetRows <= +tmpref.e.r) {
 			tmpref.e.r = opts.sheetRows - 1;
 			if(tmpref.e.r > refguess.e.r) tmpref.e.r = refguess.e.r;
 			if(tmpref.e.r < tmpref.s.r) tmpref.s.r = tmpref.e.r;
@ -14419,7 +14427,14 @@ for(var cma = c; cma <= cc; ++cma) {
 			if(Rn[1]==='/'){
 				if((tmp=state.pop())[0]!==Rn[3]) throw new Error("Bad state: "+tmp.join("|"));
 				sheetnames.push(sheetname);
-				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) cursheet["!ref"] = encode_range(refguess);
+				if(refguess.s.r <= refguess.e.r && refguess.s.c <= refguess.e.c) {
+					cursheet["!ref"] = encode_range(refguess);
+					if(opts.sheetRows && opts.sheetRows <= refguess.e.r) {
+						cursheet["!fullref"] = cursheet["!ref"];
+						refguess.e.r = opts.sheetRows - 1;
+						cursheet["!ref"] = encode_range(refguess);
+					}
+				}
 				if(merges.length) cursheet["!merges"] = merges;
 				if(cstys.length > 0) cursheet["!cols"] = cstys;
 				if(rowinfo.length > 0) cursheet["!rows"] = rowinfo;
@ -15418,6 +15433,7 @@ function parse_workbook(blob, options) {
 	};
 	var addcell = function addcell(cell, line, options) {
 		if(file_depth > 1) return;
+		if(options.sheetRows && cell.r >= options.sheetRows) cell_valid = false;
 		if(!cell_valid) return;
 		if(options.cellStyles && line.XF && line.XF.data) process_cell_style(cell, line, options);
 		delete line.ixfe; delete line.XF;
@ -15441,8 +15457,7 @@ function parse_workbook(blob, options) {
 				break;
 			}
 		}
-		if(options.sheetRows && lastcell.r >= options.sheetRows) cell_valid = false;
-		else {
+		{
 			if(options.dense) {
 				if(!out[cell.r]) out[cell.r] = [];
 				out[cell.r][cell.c] = line;
@ -15607,6 +15622,13 @@ wb.opts.Date1904 = Workbook.WBProps.date1904 = val; break;
 						if(range.e.r > 0 && range.e.c > 0) {
 							range.e.r--; range.e.c--;
 							out["!ref"] = encode_range(range);
+							if(options.sheetRows && options.sheetRows <= range.e.r) {
+								var tmpri = range.e.r;
+								range.e.r = options.sheetRows - 1;
+								out["!fullref"] = out["!ref"];
+								out["!ref"] = encode_range(range);
+								range.e.r = tmpri;
+							}
 							range.e.r++; range.e.c++;
 						}
 						if(merges.length > 0) out["!merges"] = merges;
@ -17796,7 +17818,7 @@ var HTML_ = (function() {
 		for(i = 0; i < rows.length; ++i) {
 			var row = rows[i].trim();
 			var hd = row.slice(0,3).toLowerCase();
-			if(hd == "<tr") { ++R; C = 0; continue; }
+			if(hd == "<tr") { ++R; if(opts.sheetRows && opts.sheetRows <= R) { --R; break; } C = 0; continue; }
 			if(hd != "<td") continue;
 			var cells = row.split(/<\/td>/i);
 			for(j = 0; j < cells.length; ++j) {
@ -17900,10 +17922,11 @@ function parse_dom_table(table, _opts) {
 	if(DENSE != null) opts.dense = DENSE;
 	var ws = opts.dense ? ([]) : ({});
 	var rows = table.getElementsByTagName('tr');
-	var range = {s:{r:0,c:0},e:{r:rows.length - 1,c:0}};
+	var sheetRows = Math.min(opts.sheetRows||10000000, rows.length);
+	var range = {s:{r:0,c:0},e:{r:sheetRows - 1,c:0}};
 	var merges = [], midx = 0;
 	var R = 0, _C = 0, C = 0, RS = 0, CS = 0;
-	for(; R < rows.length; ++R) {
+	for(; R < sheetRows; ++R) {
 		var row = rows[R];
 		var elts = (row.children);
 		for(_C = C = 0; _C < elts.length; ++_C) {
@ -17937,6 +17960,7 @@ function parse_dom_table(table, _opts) {
 	}
 	ws['!merges'] = merges;
 	ws['!ref'] = encode_range(range);
+	if(sheetRows < rows.length) ws['!fullref'] = encode_range((range.e.r = rows.length-1,range));
 	return ws;
 }

@ -18007,6 +18031,11 @@ var parse_content_xml = (function() {
 			case 'table': case '工作表': // 9.1.2 <table:table>
 				if(Rn[1]==='/') {
 					if(range.e.c >= range.s.c && range.e.r >= range.s.r) ws['!ref'] = encode_range(range);
+					if(opts.sheetRows > 0 && opts.sheetRows <= range.e.r) {
+						ws['!fullref'] = ws['!ref'];
+						range.e.r = opts.sheetRows - 1;
+						ws['!ref'] = encode_range(range);
+					}
 					if(merges.length) ws['!merges'] = merges;
 					if(rowinfo.length) ws["!rows"] = rowinfo;
 					sheetag.name = utf8read(sheetag['名称'] || sheetag.name);
@ -18123,7 +18152,7 @@ var parse_content_xml = (function() {
 					if(comments.length > 0) { q.c = comments; comments = []; }
 					if(textp && opts.cellText !== false) q.w = textp;
 					if(!isstub || opts.sheetStubs) {
-						if(!(opts.sheetRows && opts.sheetRows < R)) {
+						if(!(opts.sheetRows && opts.sheetRows <= R)) {
 							for(var rpt = 0; rpt < rowpeat; ++rpt) {
 								colpeat = parseInt(ctag['number-columns-repeated']||"1", 10);
 								if(opts.dense) {