pandemonium_engine/modules/web/doc_classes/HTMLTemplate.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="HTMLTemplate" inherits="Resource" version="4.4">
	<brief_description>
		A class that can be used to easily script and render HTML with.
	</brief_description>
	<description>
		A class that can be used to easily render HTML with. An instance of this class could be one of a traditional web application's View. (From the Model-View-Controller or MVC pattern.)
		Some traditional web applications use a templating language to render their final output using a set of variables. Some templating language examples: Blade, Handlebars, Razor, etc. Some of these have features like for loops, ifs, they can even support method calls. This class implements similar functinality, albeit in a different manner.
		The render control logic should be implemented by overriding [method _render], variable substitutions can be done using the available helper methods.
		This class uses a templating syntax like: [code]{{ EXPRESSION }}[/code]. Everything inbetween [code]{{ }}[/code] is an expression that the system will replace during rendering with actual values from a passed in Dictionary.
		Assuming you pass in the following Dictionary to [method render_template]:
		[code]var d : Dictionary = { 
			"var": VALUE,
			"var1": VALUE,
			"var2": VALUE,
			"var_dict": {
				"x": VALUE
			},
			"var_arr": [
				VALUE,
			]
		}[/code]
		Supported expressions:
		0. To escape [code]{{[/code] use: [code]{\{[/code].  [code]{\\{[/code] will turn into [code]{\{[/code] etc.
		1. [code]p(var)[/code] - print, escaped, also includes to string cast.
		2. [code]{{ var }}[/code] - equivalent to [code]p(var)[/code].
		3. [code](var)[/code] - equivalent to [code]p(var)[/code].
		4. [code]pr(var)[/code] - print_raw, not escaped, also includes a cast to string.
		5. [code]pb(var)[/code] - print_newline_to_br, escaped, turns newlines into br tags, also includes a to string cast.
		6. [code]prb(var)[/code] - print_raw_newline_to_br, not escaped, turns newlines into br tags, also includes a to string cast.
		7. [code]vf("%d %d", var1, var2)[/code] - vformat or snprintf or String fromatting using % in gdscript.
		8. [code]qp(var1, var2)[/code] -  Same as p, but only prints when it's first argument evaluates to true. (First arg is not printed!)
		9. [code]qpr(var1, var2)[/code] - Same as pr, but only prints when it's first argument evaluates to true. (First arg is not printed!)
		10. [code]qpb(var1, var2)[/code] - Same as pb, but only prints when it's first argument evaluates to true. (First arg is not printed!)
		11. [code]qprb(var1, var2)[/code] - Same as prb, but only prints when it's first argument evaluates to true. (First arg is not printed!)
		12. [code]qvf(var1, "%d %d", var1, var2)[/code] - Same as vf, but only prints when it's first argument evaluates to true. (First arg is not printed!)
		13. [code]p(var_arr[0])[/code] - Array indexing.
		14. [code]p(var_dict["x"]), p(var_dict[x]), p(var_dict['x'])[/code] - Dictionary indexing.
		15. [code]p(var1, var2)[/code] - All methods supports multiple arguments.
		16. Let's say [code]var1[/code] is a [Vector3], [code]var["x"][/code] and [code]var[0][/code] and [code]var[x][/code] will also work.
		17. Indexing will also call [code]get()[/code] on [Object]s.
		Not supported:
		0. [code]p(var[var[var[2]]])[/code] Recursive indexing.
		1. No actual method calls. Make everything available that your templates need in your controller class!
		So this is how your HTML will look like: [code]... HTML markup ... {{ p(var) }} ... {{ pr(var) }} ... {{ pb(var) }} ... {{ prb(var, var2) }} ... {{ vf("%d %d", var1, var2) }} ... etc.[/code]
		Note: For a different approach to generating HTML, you can also take a look at [HTMLBuilder].
	</description>
	<tutorials>
	</tutorials>
	<methods>
		<method name="_render" qualifiers="virtual">
			<return type="String" />
			<argument index="0" name="request" type="WebServerRequest" />
			<argument index="1" name="data" type="Dictionary" />
			<description>
				Override this method to implement your own rendering for any given HTMLTemplate.
			</description>
		</method>
		<method name="add_template">
			<return type="void" />
			<argument index="0" name="template" type="HTMLTemplateData" />
			<description>
				Adds a [HTMLTemplateData] template.
			</description>
		</method>
		<method name="call_template_method">
			<return type="String" />
			<argument index="0" name="method" type="int" enum="HTMLTemplate.TemplateExpressionMethods" />
			<argument index="1" name="data" type="Array" />
			<argument index="2" name="first_var_decides_print" type="bool" />
			<description>
				Turns an [Array] of Variants into [String] using the given method.
			</description>
		</method>
		<method name="clear_template_defaults">
			<return type="void" />
			<description>
				Clears template defaults.
			</description>
		</method>
		<method name="clear_template_overrides">
			<return type="void" />
			<description>
				Clears template overrides.
			</description>
		</method>
		<method name="clear_templates">
			<return type="void" />
			<description>
				Clears templates.
			</description>
		</method>
		<method name="get_and_render_template">
			<return type="String" />
			<argument index="0" name="name" type="StringName" />
			<argument index="1" name="data" type="Dictionary" />
			<description>
				Gets a template string using [method get_template] and does method substitutions on it.
			</description>
		</method>
		<method name="get_template">
			<return type="HTMLTemplateData" />
			<argument index="0" name="index" type="int" />
			<description>
				Gets a template.
			</description>
		</method>
		<method name="get_template_count" qualifiers="const">
			<return type="int" />
			<description>
				Returns the template count.
			</description>
		</method>
		<method name="get_template_default" qualifiers="const">
			<return type="String" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Returns a default template value previously set.
			</description>
		</method>
		<method name="get_template_override" qualifiers="const">
			<return type="String" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Returns an override template value previously set.
			</description>
		</method>
		<method name="get_template_text">
			<return type="String" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Returns a template text identified by name. This method first looks into overrides, then it tries to get it from [member templates] (in order), and then it tries default values.
			</description>
		</method>
		<method name="has_template_default" qualifiers="const">
			<return type="bool" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Returns whether a template default denoted by name is set.
			</description>
		</method>
		<method name="has_template_override" qualifiers="const">
			<return type="bool" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Returns whether a template override denoted by name is set.
			</description>
		</method>
		<method name="process_template_expression">
			<return type="String" />
			<argument index="0" name="expression" type="String" />
			<argument index="1" name="data" type="Dictionary" />
			<description>
				Processes an expression in a template. An expression in the template look like: [code]{{ EXPRESSION }}[/code].
			</description>
		</method>
		<method name="process_template_expression_variable">
			<return type="Variant" />
			<argument index="0" name="variable" type="String" />
			<argument index="1" name="data" type="Dictionary" />
			<argument index="2" name="allow_missing" type="bool" default="false" />
			<description>
				Processes one variable from an expression in a template. An expression in the template look like: [code]{{ EXPRESSION }}[/code].
			</description>
		</method>
		<method name="remove_template">
			<return type="void" />
			<argument index="0" name="index" type="int" />
			<description>
				Removes a template.
			</description>
		</method>
		<method name="remove_template_default">
			<return type="void" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Removes a template default.
			</description>
		</method>
		<method name="remove_template_override">
			<return type="void" />
			<argument index="0" name="name" type="StringName" />
			<description>
				Removes a template override.
			</description>
		</method>
		<method name="render">
			<return type="String" />
			<argument index="0" name="request" type="WebServerRequest" />
			<argument index="1" name="data" type="Dictionary" />
			<description>
				Use this method to render the final output. This calls [method _render].
			</description>
		</method>
		<method name="render_template">
			<return type="String" />
			<argument index="0" name="text" type="String" />
			<argument index="1" name="data" type="Dictionary" />
			<description>
				Soes does variable substitutions on the given template text.
			</description>
		</method>
		<method name="set_template_default">
			<return type="void" />
			<argument index="0" name="name" type="StringName" />
			<argument index="1" name="value" type="String" />
			<description>
				Sets a template default value.
			</description>
		</method>
		<method name="set_template_override">
			<return type="void" />
			<argument index="0" name="name" type="StringName" />
			<argument index="1" name="value" type="String" />
			<description>
				Sets a template override value.
			</description>
		</method>
	</methods>
	<members>
		<member name="template_defaults" type="Dictionary" setter="set_template_defaults" getter="get_template_defaults">
			Returns all template default values.
		</member>
		<member name="template_overrides" type="Dictionary" setter="set_template_overrides" getter="get_template_overrides">
			Returns all template override values.
		</member>
		<member name="templates" type="Array" setter="set_templates" getter="get_templates" default="[  ]">
			Returns all templates.
		</member>
	</members>
	<constants>
		<constant name="TEMPLATE_EXPRESSION_METHOD_PRINT" value="0" enum="TemplateExpressionMethods">
			xml_excape() and add value to the final string.
		</constant>
		<constant name="TEMPLATE_EXPRESSION_METHOD_PRINT_RAW" value="1" enum="TemplateExpressionMethods">
			Add value to the final string.
		</constant>
		<constant name="TEMPLATE_EXPRESSION_METHOD_PRINT_BR" value="2" enum="TemplateExpressionMethods">
			xml_excape() and add value to the final string. This also converts newlines into br html tags.
		</constant>
		<constant name="TEMPLATE_EXPRESSION_METHOD_PRINT_RAW_BR" value="3" enum="TemplateExpressionMethods">
			Add value to the final string. This also converts newlines into br html tags.
		</constant>
		<constant name="TEMPLATE_EXPRESSION_METHOD_VFORMAT" value="4" enum="TemplateExpressionMethods">
			vformat the given string, using it's passed variables.
		</constant>
	</constants>
</class>