Support case insensitive matching in prefix/suffix operators (#6468)

* Support case insensitive matching in prefix/suffix operators

Support `caseinsensitive`/`caseinsensitive` suffixes in the following
filter operators:

  * prefix
  * suffix
  * removeprefix
  * removesuffix

The suffixes have the same behaviour as in the match operator.

Closes: #6407

* Do not filter titles if suffix/removesuffix operand is empty

Issue: #6407

core/modules/filters/prefix.js

@@ -16,7 +16,24 @@ Filter operator for checking if a title starts with a prefix
 Export our filter function
 */
 exports.prefix = function(source,operator,options) {
-	var results = [];
+	var results = [],
+		suffixes = (operator.suffixes || [])[0] || [];
+	if(suffixes.indexOf("caseinsensitive") !== -1) {
+		var operand = operator.operand.toLowerCase();
+		if(operator.prefix === "!") {
+			source(function(tiddler,title) {
+				if(title.toLowerCase().substr(0,operand.length) !== operand) {
+					results.push(title);
+				}
+			});
+		} else {
+			source(function(tiddler,title) {
+				if(title.toLowerCase().substr(0,operand.length) === operand) {
+					results.push(title);
+				}
+			});
+		}
+	} else {
 		if(operator.prefix === "!") {
 			source(function(tiddler,title) {
 				if(title.substr(0,operator.operand.length) !== operator.operand) {
@@ -30,6 +47,7 @@ exports.prefix = function(source,operator,options) {
 				}
 			});
 		}
+	}
 	return results;
 };
 

core/modules/filters/removeprefix.js

@@ -16,12 +16,22 @@ Filter operator for removing a prefix from each title in the list. Titles that d
 Export our filter function
 */
 exports.removeprefix = function(source,operator,options) {
-	var results = [];
+	var results = [],
+		suffixes = (operator.suffixes || [])[0] || [];
+	if(suffixes.indexOf("caseinsensitive") !== -1) {
+		var operand = operator.operand.toLowerCase();
+		source(function(tiddler,title) {
+			if(title.toLowerCase().substr(0,operand.length) === operand) {
+				results.push(title.substr(operand.length));
+			}
+		});
+	} else {
 		source(function(tiddler,title) {
 			if(title.substr(0,operator.operand.length) === operator.operand) {
 				results.push(title.substr(operator.operand.length));
 			}
 		});
+	}
 	return results;
 };
 

core/modules/filters/removesuffix.js

@@ -16,12 +16,26 @@ Filter operator for removing a suffix from each title in the list. Titles that d
 Export our filter function
 */
 exports.removesuffix = function(source,operator,options) {
-	var results = [];
+	var results = [],
+		suffixes = (operator.suffixes || [])[0] || [];
+	if (!operator.operand) {
+		source(function(tiddler,title) {
+			results.push(title);
+		});
+	} else if(suffixes.indexOf("caseinsensitive") !== -1) {
+		var operand = operator.operand.toLowerCase();
+		source(function(tiddler,title) {
+			if(title && title.toLowerCase().substr(-operand.length) === operand) {
+				results.push(title.substr(0,title.length - operand.length));
+			}
+		});
+	} else {
 		source(function(tiddler,title) {
 			if(title && title.substr(-operator.operand.length) === operator.operand) {
 				results.push(title.substr(0,title.length - operator.operand.length));
 			}
 		});
+	}
 	return results;
 };
 

core/modules/filters/suffix.js

@@ -16,7 +16,28 @@ Filter operator for checking if a title ends with a suffix
 Export our filter function
 */
 exports.suffix = function(source,operator,options) {
-	var results = [];
+	var results = [],
+		suffixes = (operator.suffixes || [])[0] || [];
+	if (!operator.operand) {
+		source(function(tiddler,title) {
+			results.push(title);
+		});
+	} else if(suffixes.indexOf("caseinsensitive") !== -1) {
+		var operand = operator.operand.toLowerCase();
+		if(operator.prefix === "!") {
+			source(function(tiddler,title) {
+				if(title.toLowerCase().substr(-operand.length) !== operand) {
+					results.push(title);
+				}
+			});
+		} else {
+			source(function(tiddler,title) {
+				if(title.toLowerCase().substr(-operand.length) === operand) {
+					results.push(title);
+				}
+			});
+		}
+	} else {
 		if(operator.prefix === "!") {
 			source(function(tiddler,title) {
 				if(title.substr(-operator.operand.length) !== operator.operand) {
@@ -30,6 +51,7 @@ exports.suffix = function(source,operator,options) {
 				}
 			});
 		}
+	}
 	return results;
 };
 

editions/test/tiddlers/tests/test-filters.js

@@ -314,7 +314,32 @@ Tests the filtering mechanism.
 	
 		it("should handle the prefix operator", function() {
 			expect(wiki.filterTiddlers("[prefix[Tiddler]]").join(",")).toBe("Tiddler Three,TiddlerOne");
+			expect(wiki.filterTiddlers("[prefix:casesensitive[tiddler]]").join(",")).toBe("");
+			expect(wiki.filterTiddlers("[prefix:caseinsensitive[tiddler]]").join(",")).toBe("Tiddler Three,TiddlerOne");
 			expect(wiki.filterTiddlers("[prefix[nothing]]").join(",")).toBe("");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]prefix[]]").join(",")).toBe("ABCDE,abcde");
+		});
+
+		it("should handle the suffix operator", function() {
+			expect(wiki.filterTiddlers("[suffix[One]]").join(",")).toBe("TiddlerOne");
+			expect(wiki.filterTiddlers("[suffix:casesensitive[one]]").join(",")).toBe("one");
+			expect(wiki.filterTiddlers("[suffix:caseinsensitive[one]]").join(",")).toBe("one,TiddlerOne");
+			expect(wiki.filterTiddlers("[suffix[nothing]]").join(",")).toBe("");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]suffix[]]").join(",")).toBe("ABCDE,abcde");
+		});
+
+		it("should handle the removeprefix operator", function() {
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removeprefix[ABC]]").join(",")).toBe("DE");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removeprefix:casesensitive[ABC]]").join(",")).toBe("DE");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removeprefix:caseinsensitive[abc]]").join(",")).toBe("DE,de");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removeprefix[]]").join(",")).toBe("ABCDE,abcde");
+		});
+
+		it("should handle the removesuffix operator", function() {
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removesuffix[DE]]").join(",")).toBe("ABC");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removesuffix:casesensitive[DE]]").join(",")).toBe("ABC");
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removesuffix:caseinsensitive[de]]").join(",")).toBe("ABC,abc")
+			expect(wiki.filterTiddlers("[enlist[ABCDE abcde]removesuffix[]]").join(",")).toBe("ABCDE,abcde");
 		});
 	
 		it("should handle the sort and sortcs operators", function() {

editions/tw5.com/tiddlers/filters/examples/prefix.tid

@@ -1,9 +1,10 @@
 created: 20150123223129000
-modified: 20150123223321000
+modified: 20220218023400000
 tags: [[prefix Operator]] [[Operator Examples]]
 title: prefix Operator (Examples)
 type: text/vnd.tiddlywiki
 
 <<.operator-example 1 "[tag[task]!prefix[Go]]">>
-<<.operator-example 2 "[prefix[$:/languages/]]">>
+<<.operator-example 2 "[tag[task]!prefix:caseinsensitive[go]]">>
-<<.operator-example 3 "[prefix[$:/]]" "same as `[is[system]]`">>
+<<.operator-example 3 "[prefix[$:/languages/]]">>
+<<.operator-example 4 "[prefix[$:/]]" "same as `[is[system]]`">>

editions/tw5.com/tiddlers/filters/examples/removeprefix.tid

@@ -1,7 +1,8 @@
 created: 20150118132851000
-modified: 20150123210429000
+modified: 20220218023400000
 tags: [[removeprefix Operator]] [[Operator Examples]]
 title: removeprefix Operator (Examples)
 type: text/vnd.tiddlywiki
 
 <<.operator-example 1 "[[My Cat]] [[Your Garden]] [[My Favourite Armchair]] +[removeprefix[My ]]">>
+<<.operator-example 2 "[[My Cat]] [[Your Garden]] [[My Favourite Armchair]] +[removeprefix:caseinsensitive[my ]]">>

editions/tw5.com/tiddlers/filters/examples/removesuffix.tid

@@ -1,9 +1,8 @@
 created: 20150118132851000
-modified: 20150123211000000
+modified: 20220218023400000
 tags: [[removesuffix Operator]] [[Operator Examples]]
 title: removesuffix Operator (Examples)
 type: text/vnd.tiddlywiki
 
 <<.operator-example 1 "SIMPLEX Googolplex Complex +[removesuffix[plex]]">>
-
+<<.operator-example 2 "SIMPLEX Googolplex Complex +[removesuffix:caseinsensitive[plex]]">>
-

editions/tw5.com/tiddlers/filters/examples/suffix.tid

@@ -1,8 +1,9 @@
 created: 20150124113652000
-modified: 20150124113925000
+modified: 20220218023400000
 tags: [[suffix Operator]] [[Operator Examples]]
 title: suffix Operator (Examples)
 type: text/vnd.tiddlywiki
 
 <<.operator-example 1 "[suffix[.jpg]]">>
-<<.operator-example 2 "[tag[task]!suffix[ing]]">>
+<<.operator-example 2 "[suffix:caseinsensitive[.JPG]]">>
+<<.operator-example 3 "[tag[task]!suffix[ing]]">>

editions/tw5.com/tiddlers/filters/prefix.tid

@@ -1,5 +1,5 @@
 created: 20140410103123179
-modified: 20150203192735000
+modified: 20220218023400000
 tags: [[Filter Operators]] [[String Operators]] [[Negatable Operators]]
 title: prefix Operator
 type: text/vnd.tiddlywiki
@@ -10,7 +10,22 @@ op-parameter: a string of characters
 op-parameter-name: S
 op-output: those input titles that start with <<.place S>>
 op-neg-output: those input tiddlers that do <<.em not>> start with <<.place S>>
+op-suffix: the <<.op prefix>> operator uses a rich suffix, see below for details
 
-<<.s-matching-is-case-sensitive>>
+<<.from-version "5.2.2">>
+
+The <<.op prefix>> operator uses an extended syntax that permits multiple flags to be passed:
+
+```
+[prefix:<flag list>[<operand>]]
+```
+
+* ''flag list'': a comma delimited list of flags
+* ''operand'': filter operand
+
+The available flags are:
+
+* ''casesensitive'': (default), this flag forces a case-sensitive match, where upper and lower case letters are considered different
+* ''caseinsensitive'': overrides the default so that upper and lower case letters are considered identical for matching purposes
 
 <<.operator-examples "prefix">>

editions/tw5.com/tiddlers/filters/removeprefix.tid

@@ -1,5 +1,5 @@
 created: 20140410103123179
-modified: 20150203190709000
+modified: 20220218023400000
 tags: [[Filter Operators]] [[String Operators]]
 title: removeprefix Operator
 type: text/vnd.tiddlywiki
@@ -9,9 +9,24 @@ op-input: a [[selection of titles|Title Selection]]
 op-parameter: a string of characters
 op-parameter-name: S
 op-output: those input titles that start with <<.place S>>, but with those characters discarded
-
+op-suffix: the <<.op removeprefix>> operator uses a rich suffix, see below for details
-<<.s-matching-is-case-sensitive>>
 
 <<.tip " This filters out input titles that do not start with S. For removing S without filtering out input titles that don't start with S, see [[trim|trim Operator]].">>
 
+<<.from-version "5.2.2">>
+
+The <<.op removeprefix>> operator uses an extended syntax that permits multiple flags to be passed:
+
+```
+[removeprefix:<flag list>[<operand>]]
+```
+
+* ''flag list'': a comma delimited list of flags
+* ''operand'': filter operand
+
+The available flags are:
+
+* ''casesensitive'': (default), this flag forces a case-sensitive match, where upper and lower case letters are considered different
+* ''caseinsensitive'': overrides the default so that upper and lower case letters are considered identical for matching purposes
+
 <<.operator-examples "removeprefix">>

editions/tw5.com/tiddlers/filters/removesuffix.tid

@@ -1,5 +1,5 @@
 created: 20140828133830424
-modified: 20150203190744000
+modified: 20220218023400000
 tags: [[Filter Operators]] [[String Operators]]
 title: removesuffix Operator
 type: text/vnd.tiddlywiki
@@ -9,9 +9,24 @@ op-input: a [[selection of titles|Title Selection]]
 op-parameter: a string of characters
 op-parameter-name: S
 op-output: those input titles that end with <<.place S>>, but with those characters discarded
-
+op-suffix: the <<.op removesuffix>> operator uses a rich suffix, see below for details
-<<.s-matching-is-case-sensitive>>
 
 <<.tip " This filters out input titles that do not end with S. For removing S without filtering out input titles that don't end with S, see [[trim|trim Operator]].">>
 
+<<.from-version "5.2.2">>
+
+The <<.op removesuffix>> operator uses an extended syntax that permits multiple flags to be passed:
+
+```
+[removesuffix:<flag list>[<operand>]]
+```
+
+* ''flag list'': a comma delimited list of flags
+* ''operand'': filter operand
+
+The available flags are:
+
+* ''casesensitive'': (default), this flag forces a case-sensitive match, where upper and lower case letters are considered different
+* ''caseinsensitive'': overrides the default so that upper and lower case letters are considered identical for matching purposes
+
 <<.operator-examples "removesuffix">>

editions/tw5.com/tiddlers/filters/suffix.tid

@@ -1,5 +1,5 @@
 created: 20140828133830424
-modified: 20150203192738000
+modified: 20220218023400000
 tags: [[Filter Operators]] [[String Operators]] [[Negatable Operators]]
 title: suffix Operator
 type: text/vnd.tiddlywiki
@@ -10,7 +10,22 @@ op-parameter: a string of characters
 op-parameter-name: S
 op-output: those input titles that end with <<.place S>>
 op-neg-output: those input tiddlers that do <<.em not>> end with <<.place S>>
+op-suffix: the <<.op suffix>> operator uses a rich suffix, see below for details
 
-<<.s-matching-is-case-sensitive>>
+<<.from-version "5.2.2">>
+
+The <<.op suffix>> operator uses an extended syntax that permits multiple flags to be passed:
+
+```
+[suffix:<flag list>[<operand>]]
+```
+
+* ''flag list'': a comma delimited list of flags
+* ''operand'': filter operand
+
+The available flags are:
+
+* ''casesensitive'': (default), this flag forces a case-sensitive match, where upper and lower case letters are considered different
+* ''caseinsensitive'': overrides the default so that upper and lower case letters are considered identical for matching purposes
 
 <<.operator-examples "suffix">>