517 lines
20 KiB
JavaScript
517 lines
20 KiB
JavaScript
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/*! dustjs-helpers - v1.3.0
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* https://github.com/linkedin/dustjs-helpers
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* Copyright (c) 2014 Aleksander Williams; Released under the MIT License */
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(function(dust){
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//using the built in logging method of dust when accessible
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var _log = dust.log ? function(mssg) { dust.log(mssg, "INFO"); } : function() {};
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function isSelect(context) {
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var value = context.current();
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return typeof value === "object" && value.isSelect === true;
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}
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// Utility method : toString() equivalent for functions
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function jsonFilter(key, value) {
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if (typeof value === "function") {
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//to make sure all environments format functions the same way
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return value.toString()
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//remove all leading and trailing whitespace
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.replace(/(^\s+|\s+$)/mg, '')
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//remove new line characters
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.replace(/\n/mg, '')
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//replace , and 0 or more spaces with ", "
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.replace(/,\s*/mg, ', ')
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//insert space between ){
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.replace(/\)\{/mg, ') {')
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;
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}
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return value;
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}
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// Utility method: to invoke the given filter operation such as eq/gt etc
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function filter(chunk, context, bodies, params, filterOp) {
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params = params || {};
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var body = bodies.block,
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actualKey,
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expectedValue,
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filterOpType = params.filterOpType || '';
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// when @eq, @lt etc are used as standalone helpers, key is required and hence check for defined
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if ( typeof params.key !== "undefined") {
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actualKey = dust.helpers.tap(params.key, chunk, context);
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}
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else if (isSelect(context)) {
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actualKey = context.current().selectKey;
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// supports only one of the blocks in the select to be selected
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if (context.current().isResolved) {
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filterOp = function() { return false; };
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}
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}
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else {
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_log("No key specified for filter in:" + filterOpType + " helper ");
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return chunk;
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}
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expectedValue = dust.helpers.tap(params.value, chunk, context);
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// coerce both the actualKey and expectedValue to the same type for equality and non-equality compares
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if (filterOp(coerce(expectedValue, params.type, context), coerce(actualKey, params.type, context))) {
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if (isSelect(context)) {
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context.current().isResolved = true;
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}
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// we want helpers without bodies to fail gracefully so check it first
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if(body) {
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return chunk.render(body, context);
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}
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else {
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_log("No key specified for filter in:" + filterOpType + " helper ");
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return chunk;
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}
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}
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else if (bodies['else']) {
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return chunk.render(bodies['else'], context);
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}
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return chunk;
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}
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function coerce (value, type, context) {
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if (value) {
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switch (type || typeof(value)) {
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case 'number': return +value;
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case 'string': return String(value);
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case 'boolean': {
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value = (value === 'false' ? false : value);
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return Boolean(value);
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}
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case 'date': return new Date(value);
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case 'context': return context.get(value);
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}
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}
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return value;
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}
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var helpers = {
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// Utility helping to resolve dust references in the given chunk
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// uses the Chunk.render method to resolve value
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/*
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Reference resolution rules:
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if value exists in JSON:
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"" or '' will evaluate to false, boolean false, null, or undefined will evaluate to false,
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numeric 0 evaluates to true, so does, string "0", string "null", string "undefined" and string "false".
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Also note that empty array -> [] is evaluated to false and empty object -> {} and non-empty object are evaluated to true
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The type of the return value is string ( since we concatenate to support interpolated references
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if value does not exist in JSON and the input is a single reference: {x}
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dust render emits empty string, and we then return false
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if values does not exist in JSON and the input is interpolated references : {x} < {y}
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dust render emits < and we return the partial output
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*/
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"tap": function(input, chunk, context) {
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// return given input if there is no dust reference to resolve
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// dust compiles a string/reference such as {foo} to a function
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if (typeof input !== "function") {
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return input;
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}
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var dustBodyOutput = '',
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returnValue;
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//use chunk render to evaluate output. For simple functions result will be returned from render call,
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//for dust body functions result will be output via callback function
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returnValue = chunk.tap(function(data) {
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dustBodyOutput += data;
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return '';
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}).render(input, context);
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chunk.untap();
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//assume it's a simple function call if return result is not a chunk
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if (returnValue.constructor !== chunk.constructor) {
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//use returnValue as a result of tap
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return returnValue;
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} else if (dustBodyOutput === '') {
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return false;
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} else {
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return dustBodyOutput;
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}
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},
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"sep": function(chunk, context, bodies) {
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var body = bodies.block;
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if (context.stack.index === context.stack.of - 1) {
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return chunk;
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}
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if(body) {
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return bodies.block(chunk, context);
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}
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else {
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return chunk;
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}
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},
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"idx": function(chunk, context, bodies) {
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var body = bodies.block;
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if(body) {
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return bodies.block(chunk, context.push(context.stack.index));
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}
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else {
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return chunk;
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}
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},
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/**
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* contextDump helper
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* @param key specifies how much to dump.
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* "current" dumps current context. "full" dumps the full context stack.
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* @param to specifies where to write dump output.
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* Values can be "console" or "output". Default is output.
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*/
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"contextDump": function(chunk, context, bodies, params) {
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var p = params || {},
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to = p.to || 'output',
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key = p.key || 'current',
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dump;
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to = dust.helpers.tap(to, chunk, context);
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key = dust.helpers.tap(key, chunk, context);
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if (key === 'full') {
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dump = JSON.stringify(context.stack, jsonFilter, 2);
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}
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else {
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dump = JSON.stringify(context.stack.head, jsonFilter, 2);
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}
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if (to === 'console') {
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_log(dump);
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return chunk;
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}
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else {
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return chunk.write(dump);
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}
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},
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/**
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if helper for complex evaluation complex logic expressions.
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Note : #1 if helper fails gracefully when there is no body block nor else block
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#2 Undefined values and false values in the JSON need to be handled specially with .length check
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for e.g @if cond=" '{a}'.length && '{b}'.length" is advised when there are chances of the a and b been
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undefined or false in the context
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#3 Use only when the default ? and ^ dust operators and the select fall short in addressing the given logic,
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since eval executes in the global scope
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#4 All dust references are default escaped as they are resolved, hence eval will block malicious scripts in the context
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Be mindful of evaluating a expression that is passed through the unescape filter -> |s
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@param cond, either a string literal value or a dust reference
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a string literal value, is enclosed in double quotes, e.g. cond="2>3"
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a dust reference is also enclosed in double quotes, e.g. cond="'{val}'' > 3"
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cond argument should evaluate to a valid javascript expression
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**/
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"if": function( chunk, context, bodies, params ){
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var body = bodies.block,
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skip = bodies['else'];
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if( params && params.cond){
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var cond = params.cond;
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cond = dust.helpers.tap(cond, chunk, context);
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// eval expressions with given dust references
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if(eval(cond)){
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if(body) {
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return chunk.render( bodies.block, context );
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}
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else {
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_log("Missing body block in the if helper!");
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return chunk;
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}
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}
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if(skip){
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return chunk.render( bodies['else'], context );
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}
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}
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// no condition
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else {
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_log("No condition given in the if helper!");
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}
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return chunk;
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},
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/**
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* math helper
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* @param key is the value to perform math against
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* @param method is the math method, is a valid string supported by math helper like mod, add, subtract
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* @param operand is the second value needed for operations like mod, add, subtract, etc.
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* @param round is a flag to assure that an integer is returned
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*/
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"math": function ( chunk, context, bodies, params ) {
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//key and method are required for further processing
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if( params && typeof params.key !== "undefined" && params.method ){
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var key = params.key,
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method = params.method,
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// operand can be null for "abs", ceil and floor
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operand = params.operand,
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round = params.round,
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mathOut = null,
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operError = function(){
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_log("operand is required for this math method");
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return null;
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};
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key = dust.helpers.tap(key, chunk, context);
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operand = dust.helpers.tap(operand, chunk, context);
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// TODO: handle and tests for negatives and floats in all math operations
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switch(method) {
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case "mod":
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if(operand === 0 || operand === -0) {
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_log("operand for divide operation is 0/-0: expect Nan!");
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}
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mathOut = parseFloat(key) % parseFloat(operand);
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break;
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case "add":
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mathOut = parseFloat(key) + parseFloat(operand);
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break;
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case "subtract":
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mathOut = parseFloat(key) - parseFloat(operand);
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break;
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case "multiply":
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mathOut = parseFloat(key) * parseFloat(operand);
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break;
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case "divide":
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if(operand === 0 || operand === -0) {
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_log("operand for divide operation is 0/-0: expect Nan/Infinity!");
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}
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mathOut = parseFloat(key) / parseFloat(operand);
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break;
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case "ceil":
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mathOut = Math.ceil(parseFloat(key));
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break;
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case "floor":
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mathOut = Math.floor(parseFloat(key));
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break;
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case "round":
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mathOut = Math.round(parseFloat(key));
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break;
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case "abs":
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mathOut = Math.abs(parseFloat(key));
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break;
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default:
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_log("method passed is not supported");
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}
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if (mathOut !== null){
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if (round) {
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mathOut = Math.round(mathOut);
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}
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if (bodies && bodies.block) {
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// with bodies act like the select helper with mathOut as the key
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// like the select helper bodies['else'] is meaningless and is ignored
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return chunk.render(bodies.block, context.push({ isSelect: true, isResolved: false, selectKey: mathOut }));
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} else {
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// self closing math helper will return the calculated output
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return chunk.write(mathOut);
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}
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} else {
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return chunk;
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}
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}
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// no key parameter and no method
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else {
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_log("Key is a required parameter for math helper along with method/operand!");
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}
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return chunk;
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},
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/**
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select helper works with one of the eq/ne/gt/gte/lt/lte/default providing the functionality
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of branching conditions
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@param key, ( required ) either a string literal value or a dust reference
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a string literal value, is enclosed in double quotes, e.g. key="foo"
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a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
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@param type (optional), supported types are number, boolean, string, date, context, defaults to string
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**/
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"select": function(chunk, context, bodies, params) {
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var body = bodies.block;
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// key is required for processing, hence check for defined
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if( params && typeof params.key !== "undefined"){
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// returns given input as output, if the input is not a dust reference, else does a context lookup
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var key = dust.helpers.tap(params.key, chunk, context);
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// bodies['else'] is meaningless and is ignored
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if( body ) {
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return chunk.render(bodies.block, context.push({ isSelect: true, isResolved: false, selectKey: key }));
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}
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else {
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_log("Missing body block in the select helper ");
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return chunk;
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}
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}
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// no key
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else {
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_log("No key given in the select helper!");
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}
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return chunk;
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},
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/**
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eq helper compares the given key is same as the expected value
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It can be used standalone or in conjunction with select for multiple branching
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@param key, The actual key to be compared ( optional when helper used in conjunction with select)
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either a string literal value or a dust reference
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a string literal value, is enclosed in double quotes, e.g. key="foo"
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a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
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@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
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@param type (optional), supported types are number, boolean, string, date, context, defaults to string
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Note : use type="number" when comparing numeric
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**/
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"eq": function(chunk, context, bodies, params) {
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if(params) {
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params.filterOpType = "eq";
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}
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return filter(chunk, context, bodies, params, function(expected, actual) { return actual === expected; });
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},
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/**
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ne helper compares the given key is not the same as the expected value
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It can be used standalone or in conjunction with select for multiple branching
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@param key, The actual key to be compared ( optional when helper used in conjunction with select)
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either a string literal value or a dust reference
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a string literal value, is enclosed in double quotes, e.g. key="foo"
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a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
|
||
|
|
@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
|
||
|
|
@param type (optional), supported types are number, boolean, string, date, context, defaults to string
|
||
|
|
Note : use type="number" when comparing numeric
|
||
|
|
**/
|
||
|
|
"ne": function(chunk, context, bodies, params) {
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "ne";
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return actual !== expected; });
|
||
|
|
}
|
||
|
|
return chunk;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
lt helper compares the given key is less than the expected value
|
||
|
|
It can be used standalone or in conjunction with select for multiple branching
|
||
|
|
@param key, The actual key to be compared ( optional when helper used in conjunction with select)
|
||
|
|
either a string literal value or a dust reference
|
||
|
|
a string literal value, is enclosed in double quotes, e.g. key="foo"
|
||
|
|
a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
|
||
|
|
@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
|
||
|
|
@param type (optional), supported types are number, boolean, string, date, context, defaults to string
|
||
|
|
Note : use type="number" when comparing numeric
|
||
|
|
**/
|
||
|
|
"lt": function(chunk, context, bodies, params) {
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "lt";
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return actual < expected; });
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
lte helper compares the given key is less or equal to the expected value
|
||
|
|
It can be used standalone or in conjunction with select for multiple branching
|
||
|
|
@param key, The actual key to be compared ( optional when helper used in conjunction with select)
|
||
|
|
either a string literal value or a dust reference
|
||
|
|
a string literal value, is enclosed in double quotes, e.g. key="foo"
|
||
|
|
a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
|
||
|
|
@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
|
||
|
|
@param type (optional), supported types are number, boolean, string, date, context, defaults to string
|
||
|
|
Note : use type="number" when comparing numeric
|
||
|
|
**/
|
||
|
|
"lte": function(chunk, context, bodies, params) {
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "lte";
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return actual <= expected; });
|
||
|
|
}
|
||
|
|
return chunk;
|
||
|
|
},
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
gt helper compares the given key is greater than the expected value
|
||
|
|
It can be used standalone or in conjunction with select for multiple branching
|
||
|
|
@param key, The actual key to be compared ( optional when helper used in conjunction with select)
|
||
|
|
either a string literal value or a dust reference
|
||
|
|
a string literal value, is enclosed in double quotes, e.g. key="foo"
|
||
|
|
a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
|
||
|
|
@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
|
||
|
|
@param type (optional), supported types are number, boolean, string, date, context, defaults to string
|
||
|
|
Note : use type="number" when comparing numeric
|
||
|
|
**/
|
||
|
|
"gt": function(chunk, context, bodies, params) {
|
||
|
|
// if no params do no go further
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "gt";
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return actual > expected; });
|
||
|
|
}
|
||
|
|
return chunk;
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
gte helper, compares the given key is greater than or equal to the expected value
|
||
|
|
It can be used standalone or in conjunction with select for multiple branching
|
||
|
|
@param key, The actual key to be compared ( optional when helper used in conjunction with select)
|
||
|
|
either a string literal value or a dust reference
|
||
|
|
a string literal value, is enclosed in double quotes, e.g. key="foo"
|
||
|
|
a dust reference may or may not be enclosed in double quotes, e.g. key="{val}" and key=val are both valid
|
||
|
|
@param value, The expected value to compare to, when helper is used standalone or in conjunction with select
|
||
|
|
@param type (optional), supported types are number, boolean, string, date, context, defaults to string
|
||
|
|
Note : use type="number" when comparing numeric
|
||
|
|
**/
|
||
|
|
"gte": function(chunk, context, bodies, params) {
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "gte";
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return actual >= expected; });
|
||
|
|
}
|
||
|
|
return chunk;
|
||
|
|
},
|
||
|
|
|
||
|
|
// to be used in conjunction with the select helper
|
||
|
|
// TODO: fix the helper to do nothing when used standalone
|
||
|
|
"default": function(chunk, context, bodies, params) {
|
||
|
|
// does not require any params
|
||
|
|
if(params) {
|
||
|
|
params.filterOpType = "default";
|
||
|
|
}
|
||
|
|
return filter(chunk, context, bodies, params, function(expected, actual) { return true; });
|
||
|
|
},
|
||
|
|
|
||
|
|
/**
|
||
|
|
* size helper prints the size of the given key
|
||
|
|
* Note : size helper is self closing and does not support bodies
|
||
|
|
* @param key, the element whose size is returned
|
||
|
|
*/
|
||
|
|
"size": function( chunk, context, bodies, params ) {
|
||
|
|
var key, value=0, nr, k;
|
||
|
|
params = params || {};
|
||
|
|
key = params.key;
|
||
|
|
if (!key || key === true) { //undefined, null, "", 0
|
||
|
|
value = 0;
|
||
|
|
}
|
||
|
|
else if(dust.isArray(key)) { //array
|
||
|
|
value = key.length;
|
||
|
|
}
|
||
|
|
else if (!isNaN(parseFloat(key)) && isFinite(key)) { //numeric values
|
||
|
|
value = key;
|
||
|
|
}
|
||
|
|
else if (typeof key === "object") { //object test
|
||
|
|
//objects, null and array all have typeof ojbect...
|
||
|
|
//null and array are already tested so typeof is sufficient http://jsperf.com/isobject-tests
|
||
|
|
nr = 0;
|
||
|
|
for(k in key){
|
||
|
|
if(Object.hasOwnProperty.call(key,k)){
|
||
|
|
nr++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
value = nr;
|
||
|
|
} else {
|
||
|
|
value = (key + '').length; //any other value (strings etc.)
|
||
|
|
}
|
||
|
|
return chunk.write(value);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
for (var key in helpers) {
|
||
|
|
dust.helpers[key] = helpers[key];
|
||
|
|
}
|
||
|
|
|
||
|
|
if(typeof exports !== 'undefined') {
|
||
|
|
module.exports = dust;
|
||
|
|
}
|
||
|
|
|
||
|
|
})(typeof exports !== 'undefined' ? require('dustjs-linkedin') : dust);
|