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// The MIT License
//
// Copyright (c) 2012 Gwendal Roué
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#import <Foundation/Foundation.h>
#import "GRMustacheAvailabilityMacros.h"
#import "GRMustache.h"

@class GRMustacheTemplate;
@class GRMustacheTemplateRepository;

/**
* The protocol for a GRMustacheTemplateRepository's dataSource.
*
* The dataSource's responsability is to provide Mustache template strings for
* template and partial names.
*
* **Companion guide:** https://github.com/groue/GRMustache/blob/master/Guides/template_repositories.md
*
* @see GRMustacheTemplateRepository
*
* @since v1.13
*/
@protocol GRMustacheTemplateRepositoryDataSource <NSObject>
@required


////////////////////////////////////////////////////////////////////////////////
/// @name Building Template IDs from Template Names
////////////////////////////////////////////////////////////////////////////////

/**
* Returns a template ID, that is to say an object that uniquely identifies a
* template or a template partial.
*
* The class of this ID is opaque: your implementation of a
* GRMustacheTemplateRepositoryDataSource would define, for itself, what kind of
* object would identity a template or a partial.
*
* For instance, a file-based data source may use NSString objects containing
* paths to the templates.
*
* You should try to choose "human-readable" template IDs. That is because
* template IDs are embedded in the description of errors that may happen during
* a template processing, in order to help the library user locate, and fix, the
* faulting template.
*
* Whenever relevant, template and partial hierarchies are supported via the
* _baseTemplateID_ parameter: it contains the template ID of the enclosing
* template, or nil when the data source is asked for a template ID for a
* partial that is referred from a raw template string (see
* [GRMustacheTemplateRepository templateFromString:error:]).
*
* Not all data sources have to implement hierarchies: they can simply ignore
* this parameter.
*
* The returned value can be nil: the library user would then eventually get an
* NSError of domain GRMustacheErrorDomain and code
* GRMustacheErrorCodeTemplateNotFound.
*
* @param templateRepository The GRMustacheTemplateRepository asking for a
* template ID.
* @param name The name of the template or template partial.
* @param baseTemplateID The template ID of the enclosing template, or nil.
*
* @return a template ID
*
* @since v1.13
*/
- (id<NSCopying>)templateRepository:(GRMustacheTemplateRepository *)templateRepository templateIDForName:(NSString *)name relativeToTemplateID:(id)baseTemplateID AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;


////////////////////////////////////////////////////////////////////////////////
/// @name Providing Template Strings from Template IDs
////////////////////////////////////////////////////////////////////////////////

/**
* Provided with a template ID that comes from
* templateRepository:templateIDForName:relativeToTemplateID:,
* returns a Mustache template string.
*
* For instance, a file-based data source may interpret the template ID as a
* NSString object containing paths to the template, and return the file
* content.
*
* As usually, whenever this method returns nil, the _outError_ parameter should
* point to a valid NSError. This NSError would eventually reach the library
* user.
*
* @param templateRepository The GRMustacheTemplateRepository asking for a
* Mustache template string.
* @param templateID The template ID of the template
* @param outError If there is an error returning a template string,
* upon return contains nil, or an NSError object
* that describes the problem.
*
* @return a Mustache template string
*
* @since v1.13
*/
- (NSString *)templateRepository:(GRMustacheTemplateRepository *)templateRepository templateStringForTemplateID:(id)templateID error:(NSError **)outError AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;
@end


/**
* Given a data source that provides Mustache template strings, a
* GRMustacheTemplateRepository's responsability is to provide
* GRMustacheTemplate instances.
*
* You may provide your own template string data source. However common cases
* such as loading templates from URLs, files, bundle resources, and
* dictionaries, are already implemented.
*
* **Companion guide:** https://github.com/groue/GRMustache/blob/master/Guides/template_repositories.md
*
* @see GRMustacheTemplate
* @see GRMustacheTemplateRepositoryDataSource
*
* @since v1.13
*/
@interface GRMustacheTemplateRepository : NSObject {
@private
    id<GRMustacheTemplateRepositoryDataSource> _dataSource;
    NSMutableDictionary *_templateForTemplateID;
    id _currentlyParsedTemplateID;
}

#if !TARGET_OS_IPHONE || __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000

////////////////////////////////////////////////////////////////////////////////
/// @name Building Repositories for Templates stored in the file system
////////////////////////////////////////////////////////////////////////////////

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of extension .mustache, encoded in UTF8, stored in the provided
* base URL.
*
* For instance:
*
* // Creates a repository for templates stored in /path/to/templates
* NSURL *baseURL = [NSURL fileURLWithPath:@"/path/to/templates"];
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBaseURL:baseURL];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.mustache
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.mustache`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the URL
* hierarchical system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.mustache, if invoked from
* /path/to/templates/profile.mustache.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base URL:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.mustache
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param URL the base URL where to look templates from.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBaseURL:(NSURL *)URL AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of provided extension, encoded in UTF8, stored in the provided
* base URL.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in
* // /path/to/templates
* NSURL *baseURL = [NSURL fileURLWithPath:@"/path/to/templates"];
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBaseURL:baseURL
* templateExtension:@"txt"];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.txt`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the URL
* hierarchical system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.txt, if invoked from
* /path/to/templates/profile.txt.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base URL:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.txt
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param URL The base URL where to look templates from.
* @param ext The extension of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBaseURL:(NSURL *)URL templateExtension:(NSString *)ext AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of provided extension, encoded in the provided encoding, stored in
* the provided base URL.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in
* // /path/to/templates, encoded with NSMacOSRomanStringEncoding:
* NSURL *baseURL = [NSURL fileURLWithPath:@"/path/to/templates"];
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBaseURL:baseURL
* templateExtension:@"txt"
* encoding:NSMacOSRomanStringEncoding];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.txt`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the URL
* hierarchical system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.txt, if invoked from
* /path/to/templates/profile.txt.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base URL:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.txt
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param URL The base URL where to look templates from.
* @param ext The extension of template files.
* @param encoding The encoding of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBaseURL:(NSURL *)URL templateExtension:(NSString *)ext encoding:(NSStringEncoding)encoding AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;
#endif /* if !TARGET_OS_IPHONE || __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000 */

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of extension .mustache, encoded in UTF8, stored in the provided
* directory.
*
* For instance:
*
* // Creates a repository for templates stored in /path/to/templates
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithDirectory:@"/path/to/templates"];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.mustache
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.mustache`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the hierarchical
* file system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.mustache, if invoked from
* /path/to/templates/profile.mustache.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base directory:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.mustache
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param path The path of the directory that stores templates.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithDirectory:(NSString *)path AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of provided extension, encoded in UTF8, stored in the provided
* directory.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in
* // /path/to/templates
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithDirectory:@"/path/to/templates"
* templateExtension:@"txt"];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.txt`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the hierarchical
* file system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.txt, if invoked from
* /path/to/templates/profile.txt.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base directory:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.txt
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param path The path of the directory that stores templates.
* @param ext The extension of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithDirectory:(NSString *)path templateExtension:(NSString *)ext AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from files of provided extension, encoded in the provided encoding, stored in
* the provided directory.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in
* // /path/to/templates, encoded with NSMacOSRomanStringEncoding:
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithDirectory:@"/path/to/templates"
* templateExtension:@"txt"
* encoding:NSMacOSRomanStringEncoding];
*
* // Returns a template for the file stored in
* // /path/to/templates/profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* A partial tag `{{>partial}}` loads a partial template stored in a file named
* `partial.txt`, located in the enclosing template's directory.
*
* You may use the slash `/`, and `..`, in order to navigate the hierarchical
* file system: `{{>partials/achievements}}` would load
* /path/to/templates/partials/achievements.txt, if invoked from
* /path/to/templates/profile.txt.
*
* When you ask the repository to parse a raw template string, partials are
* loaded from the base directory:
*
* // The partial would be loaded from
* // /path/to/templates/partials/achievements.txt
* GRMustacheTemplate *template = [repository templateFromString:@"{{>partials/achievements}}" error:NULL];
*
* @param path The path of the directory that stores templates.
* @param ext The extension of template files.
* @param encoding The encoding of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithDirectory:(NSString *)path templateExtension:(NSString *)ext encoding:(NSStringEncoding)encoding AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;


////////////////////////////////////////////////////////////////////////////////
/// @name Building Repositories for Templates stored as NSBundle resources
////////////////////////////////////////////////////////////////////////////////

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from resources of extension .mustache, encoded in UTF8, stored in the
* provided bundle.
*
* For instance:
*
* // Creates a repository for templates stored in the main bundle:
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBundle:[NSBundle mainBundle]];
*
* // Returns a template for the resource profile.mustache
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* You may provide nil for the bundle parameter: the repository will use the
* main bundle.
*
* A partial tag `{{>partial}}` loads a partial template from the
* `partial.mustache` resource in the bundle.
*
* @param bundle The bundle that stores templates as resources.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBundle:(NSBundle *)bundle AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from resources of provided extension, encoded in UTF8, stored in the provided
* bundle.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in the
* // main bundle:
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBundle:[NSBundle mainBundle]
* templateExtension:@"txt"];
*
* // Returns a template for the resource profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* You may provide nil for the bundle parameter: the repository will use the
* main bundle.
*
* A partial tag `{{>partial}}` loads a partial template from the `partial.txt`
* resource in the bundle.
*
* @param bundle The bundle that stores templates as resources.
* @param ext The extension of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBundle:(NSBundle *)bundle templateExtension:(NSString *)ext AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from resources of provided extension, encoded in the provided encoding,
* stored in the provided bundle.
*
* For instance:
*
* // Creates a repository for templates of extension `.txt` stored in the
* // main bundle, encoded with NSMacOSRomanStringEncoding:
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithBundle:[NSBundle mainBundle]
* templateExtension:@"txt"
* encoding:NSMacOSRomanStringEncoding];
*
* // Returns a template for the resource profile.txt
* GRMustacheTemplate *template = [repository templateForName:@"profile" error:NULL];
*
* You may provide nil for the bundle parameter: the repository will use the
* main bundle.
*
* A partial tag `{{>partial}}` loads a partial template from the `partial.txt`
* resource in the bundle.
*
* @param bundle The bundle that stores templates as resources.
* @param ext The extension of template files.
* @param encoding The encoding of template files.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithBundle:(NSBundle *)bundle templateExtension:(NSString *)ext encoding:(NSStringEncoding)encoding AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;


////////////////////////////////////////////////////////////////////////////////
/// @name Building Repositories for Templates stored in Memory
////////////////////////////////////////////////////////////////////////////////

/**
* Returns a GRMustacheTemplateRepository that loads Mustache template strings
* from a dictionary whose keys are template names, and values template strings.
*
* For instance:
*
* NSDictionary *partialsDictionary = [NSDictionary dictionaryWithObject:@"It works." forKey:@"partial"];
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepositoryWithPartialsDictionary:partialsDictionary];
*
* // Two templates that would render "It works."
* GRMustacheTemplate *template1 = [repository templateForName:@"partial" error:NULL];
* GRMustacheTemplate *template2 = [repository templateFromString:@"{{>partial}}" error:NULL];
*
* @param partialsDictionary A dictionary of whose keys are template names, and
* values Mustache template strings.
*
* @return a GRMustacheTemplateRepository
*
* @since v1.13
*/
+ (id)templateRepositoryWithPartialsDictionary:(NSDictionary *)partialsDictionary AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;


////////////////////////////////////////////////////////////////////////////////
/// @name Building Repositories using a custom Data Source
////////////////////////////////////////////////////////////////////////////////

/**
* Returns a GRMustacheTemplateRepository.
*
* Until it is provided with a data source, it is unable to load template by
* names, and unable to process partial tags such as `{{>partial}}`:
*
* GRMustacheTemplateRepository *repository = [GRMustacheTemplateRepository templateRepository];
* NSError *error;
*
* // Returns nil, and sets error to an NSError of domain
* // GRMustacheErrorDomain, code GRMustacheErrorCodeTemplateNotFound.
* [repository templateForName:@"foo" error:&error];
*
* // Returns nil, and sets error to an NSError of domain GRMustacheErrorDomain,
* // code GRMustacheErrorCodeTemplateNotFound.
* [repository templateFromString:@"{{>partial}}" error:&error];
*
* It is, however, able to process Mustache template strings without any
* partial:
*
* GRMustacheTemplate *template = [repository templateFromString:@"Hello {{name}}!" error:NULL];
*
* You will give it a data source conforming to the
* GRMustacheTemplateRepositoryDataSource protocol in order to load template and
* partials by name:
*
* repository.dataSource = ...;
*
* // Returns a template built from the string provided by the dataSource.
* [repository templateForName:@"foo" error:NULL];
*
* @return a GRMustacheTemplateRepository
*
* @see GRMustacheTemplateRepositoryDataSource
*
* @since v1.13
*/
+ (id)templateRepository AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* The repository's data source.
*
* @see GRMustacheTemplateRepositoryDataSource
*
* @since v1.13
*/
@property (nonatomic, assign) id<GRMustacheTemplateRepositoryDataSource> dataSource AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;


////////////////////////////////////////////////////////////////////////////////
/// @name Getting Templates out of a Repository
////////////////////////////////////////////////////////////////////////////////


/**
* Returns a template identified by its name.
*
* Depending on the way the repository has been created, the name identifies a
* URL, a file path, a key in a dictionary, or whatever is relevant to the
* repository's data source.
*
* @param name The template name
* @param outError If there is an error loading or parsing template and
* partials, upon return contains an NSError object that
* describes the problem.
*
* @return a GRMustacheTemplate
*
* @since v1.13
*/
- (GRMustacheTemplate *)templateForName:(NSString *)name error:(NSError **)outError AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;

/**
* Returns a template built from the provided Mustache template string.
*
* Depending on the way the repository has been created, partial tags such as
* `{{>partial}}` load partial templates from URLs, file paths, keys in a
* dictionary, or whatever is relevant to the repository's data source.
*
* @param templateString A Mustache template string
* @param outError If there is an error loading or parsing template and
* partials, upon return contains an NSError object that
* describes the problem.
*
* @return a GRMustacheTemplate
*
* @since v1.13
*/
- (GRMustacheTemplate *)templateFromString:(NSString *)templateString error:(NSError **)outError AVAILABLE_GRMUSTACHE_VERSION_4_0_AND_LATER;
@end
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