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Templates

You'll learn here how to load, and render templates. Guides/runtime.md will talk about about what happens during the rendering itself.

Errors

Not funny, but those happens.

Once and for all: GRMustache methods may return errors whose domain is GRMustacheErrorDomain, and error codes interpreted with the GRMustacheErrorCode enumeration:

extern NSString* const GRMustacheErrorDomain;

typedef enum {
    GRMustacheErrorCodeParseError,
    GRMustacheErrorCodeTemplateNotFound,
} GRMustacheErrorCode;

On-the-fly rendering methods

There are methods for rendering from strings, files, and bundle resources:

@interface GRMustacheTemplate

// Renders the provided templateString.
+ (NSString *)renderObject:(id)object
                fromString:(NSString *)templateString
                     error:(NSError **)outError;

// Renders the template loaded from a url. (from MacOS 10.6 and iOS 4.0)
+ (NSString *)renderObject:(id)object
         fromContentsOfURL:(NSURL *)url
                     error:(NSError **)outError;

// Renders the template loaded from a path.
+ (NSString *)renderObject:(id)object
        fromContentsOfFile:(NSString *)path
                     error:(NSError **)outError;

// Renders the template loaded from a bundle resource of extension "mustache".
+ (NSString *)renderObject:(id)object
              fromResource:(NSString *)name
                    bundle:(NSBundle *)bundle   // nil stands for the main bundle
                     error:(NSError **)outError;

// Renders the template loaded from a bundle resource of provided extension.
+ (NSString *)renderObject:(id)object
              fromResource:(NSString *)name
             withExtension:(NSString *)ext
                    bundle:(NSBundle *)bundle   // nil stands for the main bundle
                     error:(NSError **)outError;

Parse-once-and-render-many-times methods

It's efficient to parse a template once, and then render it as often as needed:

@interface GRMustacheTemplate

// Parses the templateString.
+ (id)templateFromString:(NSString *)templateString
                   error:(NSError **)outError;

// Loads and parses the template from url. (from MacOS 10.6 and iOS 4.0)
+ (id)templateFromContentsOfURL:(NSURL *)url
                          error:(NSError **)outError;

// Loads and parses the template from path.
+ (id)templateFromContentsOfFile:(NSString *)path
                           error:(NSError **)outError;

// Loads and parses the template from a bundle resource of extension "mustache".
+ (id)templateFromResource:(NSString *)name
                    bundle:(NSBundle *)bundle   // nil stands for the main bundle
                     error:(NSError **)outError;

// Loads and parses the template from a bundle resource of provided extension.
+ (id)templateFromResource:(NSString *)name
             withExtension:(NSString *)ext
                    bundle:(NSBundle *)bundle   // nil stands for the main bundle
                     error:(NSError **)outError;

Those methods return GRMustacheTemplate instances, which render objects with the following methods:

- (NSString *)renderObject:(id)object;
- (NSString *)renderObjects:(id)object, ...;    // nil-terminated list

The latter method, which takes several arguments, is helpful when several objects should feed the template. It actually initializes the rendering context stack with those objects.

Partials

When a {{>name}} Mustache tag occurs in a template, GRMustache renders in place the content of another template, the partial, identified by its name.

Depending on the method which has been used to create the original template, partials will be looked for in different places :

  • In the main bundle, with ".mustache" extension:
    • renderObject:fromString:error:
    • templateFromString:error:
  • In the specified bundle, with ".mustache" extension:
    • renderObject:fromResource:bundle:error:
    • templateFromResource:bundle:error:
  • In the specified bundle, with the provided extension:
    • renderObject:fromResource:withExtension:bundle:error:
    • templateFromResource:withExtension:bundle:error:
  • Relatively to the URL of the including template, with the same extension:
    • renderObject:fromContentsOfURL:error:
    • templateFromContentsOfURL:error:
  • Relatively to the path of the including template, with the same extension:
    • renderObject:fromContentsOfFile:error:
    • templateFromContentsOfFile:error:

You can write recursive partials. Just avoid infinite loops in your context objects.

More loading options

All methods above load UTF8-encoded templates and partials from disk. If this does not fulfill your needs, check Guides/template_repositories.md

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