mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-06-30 17:23:16 +00:00
263 lines
8.9 KiB
JavaScript
263 lines
8.9 KiB
JavaScript
/*\
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title: $:/core/modules/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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\*/
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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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"prefix": {
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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(title.substr(0," + operator.operand.length + ")" + op + "==\"" + $tw.utils.stringify(operator.operand) + "\") {$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(title.substr(0," + operator.operand.length + ")" + op + "==\"" + $tw.utils.stringify(operator.operand) + "\") {subResults.splice(r,1);}}";
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}
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},
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"is": {
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selector: function(operator) {
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var op = operator.prefix === "!" ? "!" : "";
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if(operator.operand === "shadow") {
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return "for(var title in source) {if(" + op + "this.getTiddler(title).isShadow) {$tw.utils.pushTop(subResults,title);}}";
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} else {
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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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var op = operator.prefix === "!" ? "" : "!";
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if(operator.operand === "shadow") {
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return "for(var r=subResults.length-1; r>=0; r--) {if(" + op + "this.getTiddler(subResults[r]).isShadow) {subResults.splice(r,1);}}"
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} else {
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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 filter 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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"limit": {
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selector: function(operator) {
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throw "Cannot use limit operator at the start of a filter operation";
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},
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filter: function(operator) {
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var limit = parseInt(operator.operand,10),
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base = operator.prefix === "!" ? 0 : limit;
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return "if(subResults.length > " + limit + ") {subResults.splice(" + base + ",subResults.length-" + limit + ");}";
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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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