Initial implementation of style/theme parsing.

Huge thanks to @SheetJS for guidance on how to do all of this!

Experimental, guarded by the cellStyles option (default: false)

README.md

@@ -210,6 +210,7 @@ that does not start with `!` corresponds to a cell (using `A-1` notation).
 - `.c` : comments associated with the cell
 - `.z` : the number format string associated with the cell (if requested)
 - `.l` : the hyperlink of the cell (.Target holds link, .tooltip is tooltip)
+- `.s` : the style/theme of the cell (if applicable)
 
 For dates, `.v` holds the raw date code from the sheet and `.w` holds the text
 
@@ -222,6 +223,7 @@ The exported `read` and `readFile` functions accept an options argument:
 | cellFormula | true    | Save formulae to the .f field |
 | cellHTML    | true    | Parse rich text and save HTML to the .h field |
 | cellNF      | false   | Save number format string to the .z field |
+| cellStyles  | false   | Save style/theme info to the .s field |
 | sheetStubs  | false   | Create cell objects for stub cells |
 | sheetRows   | 0       | If >0, read the first `sheetRows` rows ** |
 | bookDeps    | false   | If true, parse calculation chains |

bits/56_stycommon.js

@@ -1,2 +1,4 @@
 var styles = {}; // shared styles
 
+var themes = {}; // shared themes
+

bits/57_styxml.js

@@ -1,3 +1,48 @@
+/* 18.8.21 fills CT_Fills */
+function parse_fills(t, opts) {
+	styles.Fills = [];
+	var fill = {};
+	t[0].match(/<[^>]*>/g).forEach(function(x) {
+		var y = parsexmltag(x);
+		switch(y[0]) {
+			case '<fills': case '<fills>': case '</fills>': break;
+
+			/* 18.8.20 fill CT_Fill */
+			case '<fill>': break;
+			case '</fill>': styles.Fills.push(fill); fill = {}; break;
+
+			/* 18.8.32 patternFill CT_PatternFill */
+			case '<patternFill':
+				if(y.patternType) fill.patternType = y.patternType;
+				break;
+			case '<patternFill/>': break;
+
+			/* 18.8.3 bgColor CT_Color */
+			case '<bgColor':
+				if(!fill.bgColor) fill.bgColor = {};
+				if(y.indexed) fill.bgColor.indexed = parseInt(y.indexed);
+				if(y.theme) fill.bgColor.theme = parseInt(y.theme);
+				if(y.tint) fill.bgColor.tint = Number(y.tint);
+				/* Excel uses 8 character RGB strings? */
+				if(y.rgb) fill.bgColor.rgb = y.rgb.substring(y.rgb.length - 6);
+				break;
+			case '</bgColor>': break;
+
+			/* 18.8.19 fgColor CT_Color */
+			case '<fgColor':
+				if(!fill.fgColor) fill.fgColor = {};
+				if(y.theme) fill.fgColor.theme = parseInt(y.theme);
+				if(y.tint) fill.fgColor.tint = Number(y.tint);
+				/* Excel uses 8 character RGB strings? */
+				if(y.rgb) fill.fgColor.rgb = y.rgb.substring(y.rgb.length - 6);
+				break;
+			case '</fgColor>': break;
+
+			default: if(opts.WTF) throw 'unrecognized ' + y[0] + ' in fills';
+		}
+	});
+}
+
 /* 18.8.31 numFmts CT_NumFmts */
 function parse_numFmts(t, opts) {
 	styles.NumberFmt = [];
@@ -38,6 +83,7 @@ function parse_cellXfs(t, opts) {
 			/* 18.8.45 xf CT_Xf */
 			case '<xf': delete y[0];
 				if(y.numFmtId) y.numFmtId = parseInt(y.numFmtId, 10);
+				if(y.fillId) y.fillId = parseInt(y.fillId, 10);
 				styles.CellXf.push(y); break;
 			case '</xf>': break;
 
@@ -73,7 +119,10 @@ function parse_sty_xml(data, opts) {
 	if((t=data.match(/<numFmts([^>]*)>.*<\/numFmts>/))) parse_numFmts(t, opts);
 
 	/* fonts CT_Fonts ? */
-	/* fills CT_Fills ? */
+
+	/* fills CT_Fills */
+	if((t=data.match(/<fills([^>]*)>.*<\/fills>/))) parse_fills(t, opts);
+
 	/* borders CT_Borders ? */
 	/* cellStyleXfs CT_CellStyleXfs ? */
 

bits/72_wsxml.js

@@ -73,14 +73,24 @@ function parse_ws_xml(data, opts, rels) {
 			}
 
 			/* formatting */
-			var fmtid = 0;
+			var fmtid = 0, fillid = 0;
 			if(cell.s && styles.CellXf) {
 				var cf = styles.CellXf[cell.s];
 				if(cf && cf.numFmtId) fmtid = cf.numFmtId;
+				if(opts.cellStyles && cf && cf.fillId) fillid = cf.fillId;
 			}
 			try {
 				p.w = SSF.format(fmtid,p.v,_ssfopts);
 				if(opts.cellNF) p.z = SSF._table[fmtid];
+				if(fillid) {
+					p.s = styles.Fills[fillid];
+					if (p.s.fgColor && p.s.fgColor.theme) {
+						p.s.fgColor.rgb = rgb_tint(themes.themeElements.clrScheme[p.s.fgColor.theme].rgb, p.s.fgColor.tint || 0);
+					}
+					if (p.s.bgColor && p.s.bgColor.theme) {
+						p.s.bgColor.rgb = rgb_tint(themes.themeElements.clrScheme[p.s.bgColor.theme].rgb, p.s.bgColor.tint || 0);
+					}
+				}
 			} catch(e) { if(opts.WTF) throw e; }
 			s[cell.r] = p;
 		});

bits/79_xmlbin.js

@@ -10,6 +10,10 @@ function parse_sty(data, name, opts) {
 	return (name.substr(-4)===".bin" ? parse_sty_bin : parse_sty_xml)(data, opts);
 }
 
+function parse_theme(data, name, opts) {
+	return parse_theme_xml(data, opts);
+}
+
 function parse_sst(data, name, opts) {
 	return (name.substr(-4)===".bin" ? parse_sst_bin : parse_sst_xml)(data, opts);
 }

bits/84_defaults.js

@@ -11,6 +11,7 @@ var fix_read_opts = fix_opts([
 	['cellNF', false], /* emit cell number format string as .z */
 	['cellHTML', true], /* emit html string as .h */
 	['cellFormula', true], /* emit formulae as .f */
+	['cellStyles', false], /* emits style/theme as .s */
 
 	['sheetStubs', false], /* emit empty cells */
 	['sheetRows', 0, 'n'], /* read n rows (0 = read all rows) */

bits/85_parsezip.js

@@ -25,6 +25,9 @@ function parse_zip(zip, opts) {
 
 		styles = {};
 		if(dir.style) styles = parse_sty(getzipdata(zip, dir.style.replace(/^\//,'')),dir.style, opts);
+
+		themes = {};
+		if(opts.cellStyles && dir.themes) themes = parse_theme(getzipdata(zip, dir.themes[0].replace(/^\//,'')),dir.themes[0], opts);
 	}
 
 	var wb = parse_wb(getzipdata(zip, dir.workbooks[0].replace(/^\//,'')), dir.workbooks[0], opts);
@@ -105,6 +108,7 @@ function parse_zip(zip, opts) {
 		SheetNames: props.SheetNames,
 		Strings: strs,
 		Styles: styles,
+		Themes: themes,
 		SSF: SSF.get_table()
 	};
 	if(opts.bookFiles) {