now macro errors are printed to page (still need better introspection)

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

pwiki/page.js

@@ -2409,6 +2409,13 @@ module.System = {
 	//
 	// NOTE: these are last resort pages, preferably overloaded in /Templates.
 	//
+	ParseError: {
+		text: object.doc`
+			<slot title/>
+			<div class="error">
+				<div class="msg" wikiwords="no">ParseError: @(msg)</div>
+				Page: [@(path)]
+			</div> `,},
 	RecursionError: {
 		text: 'RECURSION ERROR: @source(../path)' },
 	NotFoundError: {

pwiki/parser.js

@@ -378,7 +378,7 @@ module.BaseParser = {
 			if(done){
 				if(to){
 					throw new Error(
-						'Premature end of input: Expected closing "'+ to +'"') }
+						'Premature end of input: Expected </'+ to +'>') }
 				return }
 
 			// special case: quoting -> collect text...
@@ -404,9 +404,9 @@ module.BaseParser = {
 					&& !(value.name == to 
 						&& value.type == 'closing')){
 				throw new Error(
-					'Unexpected "'+ value.name +'" macro' 
+					'Unexpected <'+ value.name +'> macro' 
 						+(to ? 
-							' in "'+to+'"' 
+							' in <'+to+'>' 
 							: '')) }
 			// open block...
 			if(value.type == 'opening'){
@@ -416,7 +416,7 @@ module.BaseParser = {
 			// close block...
 			} else if(value.type == 'closing'){
 				if(value.name != to){
-					throw new Error('Unexpected closing "'+ value.name +'"') }
+					throw new Error('Unexpected </'+ value.name +'>') }
 				// NOTE: we are intentionally not yielding the value here...
 				return } 
 			// normal value...
@@ -437,6 +437,7 @@ module.BaseParser = {
 	// 		one should only be used for parsing and be forgotten after 
 	// 		the ast is constructed the other should be part of the ast...
 	expand: async function*(page, ast, state={}){
+		try{
 			ast = ast == null ?
 					//this.group(page)
 					this.group(page, await page.raw ?? '')
@@ -472,7 +473,30 @@ module.BaseParser = {
 						|| page.macros[name] instanceof types.Generator){
 					yield* res
 				} else {
-				yield res } } },
+					yield res } } 
+
+			// error...
+			}catch(err){
+				console.error(err)
+				yield await page.parse(
+					// XXX add line number and page path...
+					'@include("./ParseError'
+						+':path='
+							// XXX use pwiki.encodeElem(..) ???
+							+ page.path 
+						+':msg='
+							+ err.message 
+								// quote html stuff...
+								.replace(/&/g, '&amp;')
+								.replace(/</g, '&lt;')
+								.replace(/>/g, '&gt;')
+								// quote argument syntax...
+								.replace(/["']/g, function(c){
+									return '%'+ c.charCodeAt().toString(16) })
+								.replace(/:/g, '&colon;')
+								.replace(/=/g, '&equals;')
+						+'")')
+				return } },
 
 	// recursively resolve and enumerate the ast...
 	//

pwiki2.html

@@ -150,6 +150,18 @@ body.loading .page.spinner span {
 	}
 }
 
+.error .msg {
+	font-weight: bold;
+	color: red;
+	margin-bottom: 1em;
+}
+.error {
+	background: lightyellow;
+	padding: 1em;
+	box-shadow: inset 3px 5px 15px 5px rgba(0,0,0,0.05);
+	border: dashed red 1px;
+}
+
 textarea {
 	font-size: 1.2em;
 	border: none;

pwiki2.js

@@ -36,12 +36,14 @@
 * 		- 
 *
 *
+* XXX BUG? can't use < and > (bot?) in page title...
+* XXX parser: error handling: revise page quoting... 
+* XXX parser: error handling: add line number + context... (???) 
 * XXX BUG: parser:
 * 		This will break:
 * 			await pwiki.parse('<macro src=../tags join=", ">@source(.)</macro>')
 *		This will not:
 * 			await pwiki.parse('<macro src="../tags" join=", ">@source(.)</macro>')
-* XXX ASAP parser: error handling: must output to page and be informative...
 * XXX ASAP test: can we store the file handler with permissions in a ServiceWorker??
 * XXX the parser should handle all action return values, including:
 * 			- lists			-- XXX