mirror of
https://github.com/Jermolene/TiddlyWiki5
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468749159d
So that file comparisons work better
304 lines
12 KiB
JavaScript
304 lines
12 KiB
JavaScript
/*\
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title: $:/core/modules/wiki.filters.js
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type: application/javascript
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module-type: wikimethod
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Adds tiddler filtering to the $tw.Wiki object.
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TiddlyWiki has a special syntax for expressing filters. They can be used to select tiddlers for an operation, or to filter a set of tiddlers to add or remove members.
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The mechanism is easiest to understand by first presenting some example filter strings:
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|!Filter |!Results |
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|`HelloThere` |The single tiddler titled `HelloThere` (if it exists) |
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|`[[A Title With Several Words]]` |The single tiddler titled `A Title With Several Words` (if it exists) |
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|`[title[MyTiddler]]` |The single tiddler titled `MyTiddler` (if it exists) |
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|`HelloThere Introduction` |The tiddlers titled `HelloThere` and `Introduction` (if they exist) |
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|`[tag[important]]` |Any tiddlers with the tag `important` |
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|`[!tag[important]]` |Any tiddlers not with the tag `important` |
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|`[tag[important]sort[title]]` |Any tiddlers with the tag `important` sorted by title |
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|`[tag[important]!sort[title]]` |Any tiddlers with the tag `important` reverse sorted by title |
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|`[[one][two][three]tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist and are tagged with `tom` |
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|`[[one][two][three]] [tag[tom]]` |Any of the tiddlers called `one`, `two` or `three` that exist, along with all of the source tiddlers that are tagged with `tom` |
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|`[tag[tom]] [tag[harry]] -[[one][two][three]]` |All tiddlers tagged either `tom` or `harry`, but excluding `one`, `two` and `three` |
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[[one]] [[two]] [tag[three]] -[[four]] +[sort[title]]
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[tag[important]] -[[one][two]] -[[three]] +[sort[-modified]limit[20]]
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A filter string consists of one or more filter operations, each comprising one or more filter operators with associated operands.
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The operators look like `[operator[operand]]`, where `operator` is one of:
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* ''title'': selects the tiddler with the title given in the operand
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* ''is'': tests whether a tiddler is a member of the system defined set named in the operand (see below)
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* ''has'': tests whether a tiddler has a specified field
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* ''tag'': tests whether a given tag is (`[tag[mytag]]`) or is not (`[!tag[mytag]]`) present on the tiddler
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* ''<field>'': tests whether a tiddler field has a specified value (`[modifier[Jeremy]]`) or not (`[!modifier[Jeremy]]`)
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An operator can be negated with by preceding it with `!`, for example `[!tag[Tommy]]` selects the tiddlers that are not tagged with `Tommy`.
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The operator defaults to `title` if omitted, so `[[HelloThere]]` is equivalent to `[title[HelloThere]]`. If there are no spaces in the title, then the double square brackets can also be omitted: `HelloThere`.
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The operands available with the `is` operator are:
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* ''tiddler'': selects all ordinary (non-shadow) tiddlers
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Operators are combined into logically ANDed expressions by bashing them together and merging the square brackets:
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{{{
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[tag[one]] [tag[two]] ---> [tag[one]tag[two]]
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}}}
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Operations can be preceded with `-` to negate their action, removing the selected tiddlers from the results. For example, `[tag[Tommy]] -HelloThere -[[Another One]]` selects all tiddlers tagged with `Tommy` except those titled `HelloThere` or `Another One`.
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Operations can be preceded with `+` in order to make them apply to all of the current results, rather than the original source. For example, `[tag[Jeremy]] [tag[Tommy]] +[sort[title]]` selects the tiddlers tagged `Tommy` or `Jeremy`, and sorts them by the `title` field.
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Filters are processed with the following elements:
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* a string of filter operations, each made up of one or more filter operators
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* the incoming source tiddlers
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* the overall result stack
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* the subresult stack of the tiddlers selected by the current operation
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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exports.filterTiddlers = function(filterString) {
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var fn = this.compileFilter(filterString);
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return fn.call(this,this.tiddlers);
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};
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/*
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Compiling a filter gives a JavaScript function that is invoked as `this.filter(source)`, where `source` is a hashmap of source tiddler titles (the values don't matter, so it is possible to use a store or a changes object). It returns an array of tiddler titles that satisfy the filter
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*/
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exports.compileFilter = function(filterString) {
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var filter = this.parseFilter(filterString),
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output = [],
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t,operation,operationInfo,type,p,operator,operatorInfo,fn;
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output.push(this.filterFragments.prologue);
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for(t=0; t<filter.length; t++) {
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operation = filter[t];
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operationInfo = this.filterFragments.operation.prefix[operation.prefix || ""];
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output.push(operationInfo.prologue);
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type = "selector";
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if(operation.prefix === "+") {
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type = "filter";
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}
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for(p=0; p<operation.operators.length; p++) {
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operator = operation.operators[p];
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operatorInfo = this.operators[operator.operator];
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if(!operatorInfo) { // Check for it being a field operator
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operatorInfo = this.operators["field"];
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}
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output.push(operatorInfo[type](operator));
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type = "filter";
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}
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output.push(operationInfo.epilogue);
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}
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output.push(this.filterFragments.epilogue);
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try {
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/*jslint evil: true */
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fn = eval(output.join("\n"));
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} catch(ex) {
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throw "Error in filter expression: " + ex;
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}
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return fn;
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};
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exports.filterFragments = {
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prologue: "(function(source) {\nvar results = [], subResults;",
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epilogue: "return results;\n})",
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operation: {
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prefix: {
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"": {
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prologue: "subResults = [];",
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epilogue: "$tw.utils.pushTop(results,subResults);"
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},
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"+": {
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prologue: "subResults = results.slice(0);\nresults.splice(0,results.length);",
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epilogue: "$tw.utils.pushTop(results,subResults);"
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},
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"-": {
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prologue: "subResults = [];",
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epilogue: "$tw.utils.removeArrayEntries(results,subResults);"
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}
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}
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}
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};
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exports.operators = {
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"title": {
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selector: function(operator) {
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return "if($tw.utils.hop(source,\"" + $tw.utils.stringify(operator.operand) + "\")) {$tw.utils.pushTop(subResults,\"" + $tw.utils.stringify(operator.operand) + "\");}";
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},
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filter: function(operator) {
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return "if(subResults.indexOf(\"" + $tw.utils.stringify(operator.operand) + "\") !== -1) {subResults = [\"" + $tw.utils.stringify(operator.operand) + "\"];} else {subResults = [];}";
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}
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},
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"is": {
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selector: function(operator) {
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switch(operator.operand) {
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case "tiddler":
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if(operator.prefix === "!") {
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return "subResults = [];";
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} else {
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return "for(var title in source) {$tw.utils.pushTop(subResults,title);}";
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}
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break;
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default:
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throw "Unknown operand for 'is' filter operator";
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}
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},
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filter: function(operator) {
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switch(operator.operand) {
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case "tiddler":
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if(operator.prefix === "!") {
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return "subResults = [];";
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} else {
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return "";
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}
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break;
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default:
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throw "Unknown operand for 'is' filter operator";
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}
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}
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},
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"tag": {
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selector: function(operator) {
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var op = operator.prefix === "!" ? "!" : "";
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return "for(var title in source) {if(" + op + "this.getTiddler(title).hasTag(\"" + $tw.utils.stringify(operator.operand) + "\")) {$tw.utils.pushTop(subResults,title);}}";
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},
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filter: function(operator) {
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var op = operator.prefix === "!" ? "" : "!";
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return "for(var r=subResults.length-1; r>=0; r--) {if(" + op + "this.getTiddler(subResults[r]).hasTag(\"" + $tw.utils.stringify(operator.operand) + "\")) {subResults.splice(r,1);}}";
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}
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},
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"has": {
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selector: function(operator) {
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var op = operator.prefix === "!" ? "=" : "!";
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return "for(var title in source) {if(this.getTiddler(title).fields[\"" + $tw.utils.stringify(operator.operand) + "\"] " + op + "== undefined) {$tw.utils.pushTop(subResults,title);}}";
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},
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filter: function(operator) {
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var op = operator.prefix === "!" ? "!" : "=";
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return "for(var r=subResults.length-1; r>=0; r--) {if(this.getTiddler(subResults[r]).fields[\"" + $tw.utils.stringify(operator.operand) + "\"] " + op + "== undefined) {subResults.splice(r,1);}}";
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}
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},
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"sort": {
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selector: function(operator) {
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throw "Cannot use sort operator at the start of a sort operation";
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},
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filter: function(operator) {
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var desc = operator.prefix === "!" ? "true" : "false";
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return "this.sortTiddlers(subResults,\"" + $tw.utils.stringify(operator.operand) + "\"," + desc + ");";
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}
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},
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"field": {
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selector: function(operator) {
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var op = operator.prefix === "!" ? "!" : "=";
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return "for(var title in source) {if(this.getTiddler(title).fields[\"" + $tw.utils.stringify(operator.operator) + "\"] " + op + "== \"" + operator.operand + "\") {$tw.utils.pushTop(subResults,title);}}";
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},
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filter: function(operator) {
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var op = operator.prefix === "!" ? "=" : "!";
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return "for(var r=subResults.length-1; r>=0; r--) {if(this.getTiddler(subResults[r]).fields[\"" + $tw.utils.stringify(operator.operator) + "\"] " + op + "== \"" + operator.operand + "\") {subResults.splice(r,1);}}";
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}
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}
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};
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/*
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Parses an operation within a filter string
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results: Array of array of operator nodes into which results should be inserted
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filterString: filter string
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p: start position within the string
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Returns the new start position, after the parsed operation
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*/
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function parseFilterOperation(operators,filterString,p) {
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var operator, operand, bracketPos;
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// Skip the starting square bracket
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if(filterString[p++] !== "[") {
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throw "Missing [ in filter expression";
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}
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// Process each operator in turn
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do {
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operator = {};
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// Check for an operator prefix
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if(filterString[p] === "!") {
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operator.prefix = filterString[p++];
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}
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// Get the operator name
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bracketPos = filterString.indexOf("[",p);
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if(bracketPos === -1) {
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throw "Missing [ in filter expression";
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}
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operator.operator = filterString.substring(p,bracketPos);
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if(operator.operator === "") {
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operator.operator = "title";
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}
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p = bracketPos + 1;
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// Get the operand
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bracketPos = filterString.indexOf("]",p);
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if(bracketPos === -1) {
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throw "Missing ] in filter expression";
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}
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operator.operand = filterString.substring(p,bracketPos);
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p = bracketPos + 1;
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// Push this operator
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operators.push(operator);
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} while(filterString[p] !== "]");
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// Skip the ending square bracket
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if(filterString[p++] !== "]") {
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throw "Missing ] in filter expression";
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}
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// Return the parsing position
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return p;
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}
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/*
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Parse a filter string
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*/
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exports.parseFilter = function(filterString) {
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filterString = filterString || "";
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var results = [], // Array of arrays of operator nodes {operator:,operand:}
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p = 0, // Current position in the filter string
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match;
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var whitespaceRegExp = /(\s+)/mg,
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operandRegExp = /((?:\+|\-)?)(?:(\[)|("(?:[^"])*")|('(?:[^'])*')|([^\s\[\]]+))/mg;
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while(p < filterString.length) {
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// Skip any whitespace
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whitespaceRegExp.lastIndex = p;
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match = whitespaceRegExp.exec(filterString);
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if(match && match.index === p) {
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p = p + match[0].length;
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}
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// Match the start of the operation
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if(p < filterString.length) {
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operandRegExp.lastIndex = p;
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match = operandRegExp.exec(filterString);
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if(!match || match.index !== p) {
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throw "Syntax error in filter expression";
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}
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var operation = {
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prefix: "",
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operators: []
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};
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if(match[1]) {
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operation.prefix = match[1];
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p++;
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}
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if(match[2]) { // Opening square bracket
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p = parseFilterOperation(operation.operators,filterString,p);
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} else {
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p = match.index + match[0].length;
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}
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if(match[3] || match[4] || match[5]) { // Double quoted string, single quoted string or unquoted title
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operation.operators.push(
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{operator: "title", operand: match[3] || match[4] || match[5]}
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);
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}
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results.push(operation);
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}
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}
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return results;
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};
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})();
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