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Code Issues Releases Wiki Activity

Improved comments

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Jeremy Ruston 2012-03-29 12:23:34 +01:00
parent d03d461672
commit 02aaa3567f
1 changed files with 54 additions and 23 deletions
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77
js/Renderer.js
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@ -1,7 +1,23 @@
/*\ /*\
title: js/Renderer.js title: js/Renderer.js
Renderer objects Renderer objects encapsulate a tree of nodes that are capable of rendering and selectively updating an
HTML representation of themselves. The following node types are defined:
* ''MacroNode'' - represents an invocation of a macro
* ''ElementNode'' - represents a single HTML element
* ''TextNode'' - represents an HTML text node
* ''EntityNode'' - represents an HTML entity node
* ''RawNode'' - represents a chunk of unparsed HTML text
These node types are implemented with prototypal inheritance from a base Node class. One
unusual convenience in the implementation is that the node constructors can be called without an explicit
`new` keyword: the constructors check for `this` not being an instance of themselves, and recursively invoke
themselves with `new` when required.
Convenience functions are provided to wrap up the construction of some common interface elements:
* ''ErrorNode''
* ''LabelNode''
* ''SplitLabelNode''
\*/ \*/
(function(){ (function(){
@ -14,13 +30,21 @@ var utils = require("./Utils.js"),
Dependencies = require("./Dependencies.js").Dependencies, Dependencies = require("./Dependencies.js").Dependencies,
esprima = require("esprima"); esprima = require("esprima");
// Intialise the renderer object /*
Intialise the renderer object
nodes: an array of Node objects
dependencies: an optional Dependencies object
store: a reference to the WikiStore object to use for rendering these nodes
*/
var Renderer = function(nodes,dependencies,store) { var Renderer = function(nodes,dependencies,store) {
this.nodes = nodes; this.nodes = nodes;
this.dependencies = dependencies; this.dependencies = dependencies;
this.store = store; this.store = store;
}; };
/*
The base class for all types of renderer nodes
*/
var Node = function(children) { var Node = function(children) {
if(this instanceof Node) { if(this instanceof Node) {
this.children = children; this.children = children;
@ -52,6 +76,9 @@ Construct a renderer node representing a macro invocation
srcParams: a hashmap of parameters (each can be a string, or a fn(tiddler,store,utils) for evaluated parameters) srcParams: a hashmap of parameters (each can be a string, or a fn(tiddler,store,utils) for evaluated parameters)
children: optional array of child nodes children: optional array of child nodes
store: reference to the WikiStore associated with this macro store: reference to the WikiStore associated with this macro
dependencies: optional Dependencies object representing the dependencies of this macro
Note that the dependencies will be evaluated if not provided.
*/ */
var MacroNode = function(macroName,srcParams,children,store,dependencies) { var MacroNode = function(macroName,srcParams,children,store,dependencies) {
if(this instanceof MacroNode) { if(this instanceof MacroNode) {
@ -61,27 +88,8 @@ var MacroNode = function(macroName,srcParams,children,store,dependencies) {
this.children = children; this.children = children;
this.store = store; this.store = store;
this.srcParams = typeof srcParams === "string" ? this.parseMacroParamString(srcParams) : srcParams; this.srcParams = typeof srcParams === "string" ? this.parseMacroParamString(srcParams) : srcParams;
// Evaluate the dependencies // Evaluate the dependencies if required
if(dependencies) { this.dependencies = dependencies ? dependencies : this.evaluateDependencies();
this.dependencies = dependencies;
} else {
this.dependencies = new Dependencies();
if(this.srcParams && this.macro) {
if(this.macro.dependentAll) {
this.dependencies.dependentAll = true;
}
for(var m in this.macro.params) {
var paramInfo = this.macro.params[m];
if(m in this.srcParams && paramInfo.type === "tiddler") {
if(typeof this.srcParams[m] === "function") {
this.dependencies.dependentAll = true;
} else {
this.dependencies.addDependency(this.srcParams[m],!paramInfo.skinny);
}
}
}
}
}
} else { } else {
return new MacroNode(macroName,srcParams,children,store,dependencies); return new MacroNode(macroName,srcParams,children,store,dependencies);
} }
@ -90,6 +98,29 @@ var MacroNode = function(macroName,srcParams,children,store,dependencies) {
MacroNode.prototype = new Node(); MacroNode.prototype = new Node();
MacroNode.prototype.constructor = MacroNode; MacroNode.prototype.constructor = MacroNode;
/*
Evaluate the dependencies of this macro invocation by examining the macro parameters
*/
MacroNode.prototype.evaluateDependencies = function() {
var dependencies = new Dependencies();
if(this.srcParams && this.macro) {
if(this.macro.dependentAll) {
dependencies.dependentAll = true;
}
for(var m in this.macro.params) {
var paramInfo = this.macro.params[m];
if(m in this.srcParams && paramInfo.type === "tiddler") {
if(typeof this.srcParams[m] === "function") {
dependencies.dependentAll = true;
} else {
dependencies.addDependency(this.srcParams[m],!paramInfo.skinny);
}
}
}
}
return dependencies;
};
MacroNode.prototype.parseMacroParamString = function(paramString) { MacroNode.prototype.parseMacroParamString = function(paramString) {
/*jslint evil: true */ /*jslint evil: true */
var params = {}, var params = {},