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d75e2f97df
scuffed-code/icu4c/source/common/unicode/ures.h
Vladimir Weinstein d75e2f97df ICU-1948 Introducing alias type. 
X-SVN-Rev: 8892
2002-06-14 06:01:13 +00:00

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/*
**********************************************************************
* Copyright (C) 1997-2001, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
*
* File URES.H (formerly CRESBUND.H)
*
* Modification History:
*
* Date Name Description
* 04/01/97 aliu Creation.
* 02/22/99 damiba overhaul.
* 04/04/99 helena Fixed internal header inclusion.
* 04/15/99 Madhu Updated Javadoc
* 06/14/99 stephen Removed functions taking a filename suffix.
* 07/20/99 stephen Language-independent ypedef to void*
* 11/09/99 weiv Added ures_getLocale()
******************************************************************************
*/
#ifndef URES_H
#define URES_H
#include "unicode/utypes.h"
#include "unicode/uloc.h"
/**
* \file
* \brief C API: Resource Bundle
*
* <h2>C API: Resource Bundle</h2>
*
* C API representing a collection of resource information pertaining to a given
* locale. A resource bundle provides a way of accessing locale- specific information in
* a data file. You create a resource bundle that manages the resources for a given
* locale and then ask it for individual resources.
* <P>
* The resource bundle file is a text (ASCII or Unicode) file with the format:
* <pre>
* \code
* locale {
* tag1 {...}
* tag2 {...}
* }
* \endcode
* </pre>
* The tags are used to retrieve the data later. You may not have multiple instances of
* the same tag.
* <P>
* Four data types are supported. These are solitary strings, comma-delimited lists of
* strings, 2-dimensional arrays of strings, and tagged lists of strings.
* <P>
* Note that all data is textual. Adjacent strings are merged by the low-level
* tokenizer, so that the following effects occur: foo bar, baz // 2 elements, "foo
* bar", and "baz" "foo" "bar", baz // 2 elements, "foobar", and "baz" Note that a
* single intervening space is added between merged strings, unless they are both double
* quoted. This extends to more than two strings in a row.
* <P>
* Whitespace is ignored, as in a C source file.
* <P>
* Solitary strings have the format:
* <pre>
* \code
* Tag { Data }
* \endcode
* </pre>
* This is indistinguishable from a comma-delimited list with only one element, and in
* fact may be retrieved as such (as an array, or as element 0 or an array).
* <P>
* Comma-delimited lists have the format:
* <pre>
* \code
* Tag { Data, Data, Data }
* \endcode
* </pre>
* Parsing is lenient; a final string, after the last element, is allowed.
* <P>
* Tagged lists have the format:
* <pre>
* \code
* Tag { Subtag { Data } Subtag {Data} }
* \endcode
* </pre>
* Data is retrieved by specifying the subtag.
* <P>
* Two-dimensional arrays have the format:
* <pre>
* \code
* TwoD {
* { r1c1, r1c2, ..., r1cm },
* { r2c1, r2c2, ..., r2cm },
* ...
* { rnc1, rnc2, ..., rncm }
* }
* \endcode
* </pre>
* where n is the number of rows, and m is the number of columns. Parsing is lenient (as
* in other data types). A final comma is always allowed after the last element; either
* the last string in a row, or the last row itself. Furthermore, since there is no
* ambiguity, the commas between the rows are entirely optional. (However, if a comma is
* present, there can only be one comma, no more.) It is possible to have zero columns,
* as follows:
* <pre>
* \code
* Odd { {} {} {} } // 3 x 0 array
* \endcode
* </pre>
* But it is impossible to have zero rows. The smallest array is thus a 1 x 0 array,
* which looks like this:
* <pre>
* \code
* Smallest { {} } // 1 x 0 array
* \endcode
* </pre>
* The array must be strictly rectangular; that is, each row must have the same number
* of elements.
* <P>
* <H2>Usage model:</H2>
* Resource bundles contain resources. In code, both types of entities are treated the
* same and are represented with a same data structure <pre>UResourceBundle</pre>.
* Resource bundle has a tree structure, where leaf nodes can be strings, binaries
* and integers while non-leaf nodes (including the root node) can be tables and arrays.
* One or more resource bundles are used to represent data needed by the application
* for running in the particular locale. Complete set of resource bundles for an application
* would contain all the data needed to run in intended locales. <P>
* If the data for the requested locale is missing, an effort will be made to obtain most
* usable data. This process is called fallback. Also, fallback happens when a resource
* is not present in the given bundle. Then, the other bundles in the fallback chain are
* also searched for the requested resource.<P>
* Retrieving data from resources is possible in several ways, depending on the type of
* the resources:<P>
* 1) Access by a key: this approach works only for table resources<P>
* 2) Access by an index: tables and arrays can be addressed by an index<P>
* 3) Iteration: works for tables and arrays<P>
* To use data in resource bundles, following steps are needed:<P>
* 1) opening a bundle for a particular locale:
* <pre>
* \code
* UErrorCode status = U_ZERO_ERROR;
* UResourceBundle* resB = ures_open("/datadir/resources/GUI", "de_AT_EURO", &status);
* \endcode
* </pre>
* Status allows, besides testing for plain error, to see whether fallback occured. There
* are two extra non error values for status after this operation: U_USING_FALLBACK_ERROR,
* which implies that the bundle for the requested locale was not found, but that one of
* the bundles in the fallback chain was used (de_AT and de in this case) and
* U_USING_DEFAULT_ERROR which implies that not one bundle in the fallback chain was found
* and that default locale was used. In any case, 'root' locale is always at the end of the
* chain.
*
* This is an example for using a possible custom resource:
* <pre>
* \code
* const char *currentLocale;
* UErrorCode success = U_ZERO_ERROR;
* UResourceBundle* myResources=ures_open("MyResources", currentLocale, &success );
*
* UChar *button1Title, *button2Title;
* button1Title= ures_get(myResources, "OkKey", &success );
* button2Title= ures_get(myResources, "CancelKey", &success );
* \endcode
* </pre>
*/
/**
* UResourceBundle is an opaque type for handles for resource bundles in C APIs.
* @stable
*/
struct UResourceBundle;
/**
* @stable
*/
typedef struct UResourceBundle UResourceBundle;
/**
* Numeric constants for types of resource items.
* @stable
*/
typedef enum {
RES_NONE=-1,
RES_STRING=0,
RES_BINARY=1,
RES_TABLE=2,
RES_INT=7,
RES_ARRAY=8,
/* this resource is an alias - contains a string
* that is the name of resource containing data
*/
RES_ALIAS=13,
RES_INT_VECTOR=14,
RES_RESERVED=15
} UResType;
/*
* Functions to create and destroy resource bundles.
*/
/**
* Opens a UResourceBundle, from which users can extract strings by using
* their corresponding keys.
* Note that the caller is responsible of calling <TT>ures_close</TT> on each succesfully
* opened resource bundle.
* @param path : string containing the full path pointing to the directory
* where the resources reside followed by the package name
* e.g. "/usr/resource/my_app/resources/guimessages" on a Unix system.
* if NULL, ICU default data files will be used.
* @param locale: specifies the locale for which we want to open the resource
* if NULL, the default locale will be used. If strlen(locale) == 0
* root locale will be used.
*
* @param status : fills in the outgoing error code.
* The UErrorCode err parameter is used to return status information to the user. To
* check whether the construction succeeded or not, you should check the value of
* U_SUCCESS(err). If you wish more detailed information, you can check for
* informational error results which still indicate success. U_USING_FALLBACK_ERROR
* indicates that a fall back locale was used. For example, 'de_CH' was requested,
* but nothing was found there, so 'de' was used. U_USING_DEFAULT_ERROR indicates that
* the default locale data or root locale data was used; neither the requested locale
* nor any of its fall back locales could be found.
* @return a newly allocated resource bundle.
* @see ures_close
* @stable
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_open(const char* path, /* NULL if none */
const char* locale, /* NULL if none */
UErrorCode* status);
/** This function does not care what kind of localeID is passed in. It simply opens a bundle with
* that name. Fallback mechanism is disabled for the new bundle. If the requested bundle contains
* an %%ALIAS directive, the results are undefined.
* @param path : string containing the full path pointing to the directory
* where the resources reside followed by the package name
* e.g. "/usr/resource/my_app/resources/guimessages" on a Unix system.
* if NULL, ICU default data files will be used.
* @param locale: specifies the locale for which we want to open the resource
* if NULL, the default locale will be used. If strlen(locale) == 0
* root locale will be used.
*
* @param status fills in the outgoing error code. Either U_ZERO_ERROR or U_MISSING_RESOURCE_ERROR
* @return a newly allocated resource bundle or NULL if it doesn't exist.
* @see ures_close
* @draft ICU 2.0
*/
U_CAPI UResourceBundle* U_EXPORT2
ures_openDirect(const char* path, const char* locale, UErrorCode* status);
/**
*Opens a UResourceBundle, from which users can extract strings by using
*their corresponding keys. This version of open requires the path
*string to be of type <TT>const wchar_t*</TT>.
*Note that the caller is responsible of calling <TT>ures_close</TT> on each succesfully
*opened resource bundle.
*@param path: string containing the full path pointing to the directory
* where the resources reside (should end with a directory
* separator.
* e.g. "/usr/resource/my_app/resources/" on a Unix system
* if NULL will use the system's current data directory
*@param locale: specifies the locale for which we want to open the resource
* if NULL will use the default locale
*
*@param status: fills in the outgoing error code.
*@see ures_close
*@return : a newly allocated resource bundle.
*@deprecate remove after Aug 2002
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_openW(const wchar_t* path,
const char* locale,
UErrorCode* status);
/**
* Same as ures_open() but takes a const UChar *path.
* This path will be converted to char * using the default converter,
* then ures_open() is called.
*
* @stable
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_openU(const UChar* path,
const char* locale,
UErrorCode* status);
/**
* Returns the number of strings/arrays in resource bundles.
*
*@param resourceBundle: resource bundle containing the desired strings
*@param resourceKey: key tagging the resource
*@param err: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
*@return: for <STRONG>Arrays</STRONG>: returns the number of strings in the array
* <STRONG>2d Arrays</STRONG>: returns the number of 1d arrays
* <STRONG>taggedArrays</STRONG>: returns the number of strings in the array
* <STRONG>single string</STRONG>: returns 1
*@see ures_get
* @stable
*/
U_CAPI int32_t U_EXPORT2 ures_countArrayItems(const UResourceBundle* resourceBundle,
const char* resourceKey,
UErrorCode* err);
/**
* close a resource bundle, all pointers returned from the various ures_getXXX calls
* on this particular bundle are INVALID henceforth.
*
* @param resourceBundle: a succesfully opened resourceBundle.
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @see ures_open
* @see ures_openW
* @stable
*/
U_CAPI void U_EXPORT2 ures_close(UResourceBundle* resourceBundle);
/**
* Return the version number associated with this ResourceBundle as a string.
*
* @param resourceBundle The resource bundle for which the version is checked.
* @return A version number string as specified in the resource bundle or its parent.
* The caller does not own this string.
* @stable
*/
U_CAPI const char* U_EXPORT2 ures_getVersionNumber(const UResourceBundle* resourceBundle);
/**
* Return the version number associated with this ResourceBundle as a UVersionInfo array.
*
* @param resourceBundle The resource bundle for which the version is checked.
* @param versionInfo A UVersionInfo array that is filled with the version number
* as specified in the resource bundle or its parent.
* @stable
*/
U_CAPI void U_EXPORT2 ures_getVersion(const UResourceBundle* resB, UVersionInfo versionInfo);
/**
* Return the name of the Locale associated with this ResourceBundle.
* @param resourceBundle: resource bundle in question
* @param status: just for catching illegal arguments
* @return A Locale name
* @stable
*/
U_CAPI const char* U_EXPORT2
ures_getLocale(const UResourceBundle* resourceBundle, UErrorCode* status);
/**
* Same as ures_open() but uses the fill-in parameter instead of allocating
* a bundle, if r!=NULL.
* TODO need to revisit usefulness of this function
* and usage model for fillIn parameters without knowing sizeof(UResourceBundle)
* @internal
*/
U_CAPI void U_EXPORT2
ures_openFillIn(UResourceBundle *r, const char* path,
const char* localeID, UErrorCode* status);
/**
* returns a string from a string resource type
*
* @param resourceBundle: a string resource
* @param len: fills in the length of resulting string
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return a pointer to a zero-terminated UChar array which lives in a memory mapped/DLL file.
* @stable
*/
U_CAPI const UChar* U_EXPORT2 ures_getString(const UResourceBundle* resourceBundle, int32_t* len,
UErrorCode* status);
/**
* returns a binary data from a resource. Can be used at most primitive resource types (binaries,
* strings, ints)
*
* @param resourceBundle: a string resource
* @param len: fills in the length of resulting byte chunk
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return a pointer to a chuck of unsigned bytes which live in a memory mapped/DLL file.
* @stable
*/
U_CAPI const uint8_t* U_EXPORT2 ures_getBinary(const UResourceBundle* resourceBundle, int32_t* len,
UErrorCode* status);
/**
* returns a 32 bit integer array from a resource.
*
* @param resourceBundle: an int vector resource
* @param len: fills in the length of resulting byte chunk
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return a pointer to a chuck of unsigned bytes which live in a memory mapped/DLL file.
* @draft ICU 2.0
*/
U_CAPI const int32_t* U_EXPORT2 ures_getIntVector(const UResourceBundle* resourceBundle, int32_t* len,
UErrorCode* status);
/**
* returns an unsigned integer from a resource.
* This integer is originally 28 bits.
*
* @param resourceBundle: a string resource
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return an integer value
* @draft ICU 2.0
*/
U_CAPI uint32_t U_EXPORT2 ures_getUInt(const UResourceBundle* resourceBundle, UErrorCode *status);
/**
* returns a signed integer from a resource.
* This integer is originally 28 bit and the sign gets propagated.
*
* @param resourceBundle: a string resource
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return an integer value
* @draft ICU 2.0
*/
U_CAPI int32_t U_EXPORT2 ures_getInt(const UResourceBundle* resourceBundle, UErrorCode *status);
/**
* Returns the size of a resource. Size for scalar types is always 1, and for vector/table types is
* the number of child resources.
*
* @param resourceBundle: a resource
* @return number of resources in a given resource.
* @stable
*/
U_CAPI int32_t U_EXPORT2 ures_getSize(UResourceBundle *resourceBundle);
/**
* Returns the type of a resource. Available types are defined in enum UResType
*
* @param resourceBundle: a resource
* @return type of the given resource.
* @stable
*/
U_CAPI UResType U_EXPORT2 ures_getType(UResourceBundle *resourceBundle);
/**
* Returns the key associated with a given resource. Not all the resources have a key - only
* those that are members of a table.
*
* @param resourceBundle: a resource
* @return a key associated to this resource, or NULL if it doesn't have a key
* @stable
*/
U_CAPI const char * U_EXPORT2 ures_getKey(UResourceBundle *resB);
/* ITERATION API
This API provides means for iterating through a resource
*/
/**
* Resets the internal context of a resource so that iteration starts from the first element.
*
* @param resourceBundle: a resource
* @stable
*/
U_CAPI void U_EXPORT2 ures_resetIterator(UResourceBundle *resourceBundle);
/**
* Checks whether the given resource has another element to iterate over.
*
* @param resourceBundle a resource
* @return TRUE if there are more elements, FALSE if there is no more elements
* @stable
*/
U_CAPI UBool U_EXPORT2 ures_hasNext(UResourceBundle *resourceBundle);
/**
* Returns the next resource in a given resource or NULL if there are no more resources
* to iterate over. Features a fill-in parameter.
*
* @param resourceBundle a resource
* @param fillIn if NULL a new UResourceBundle struct is allocated and must be deleted by the caller.
* Alternatively, you can supply a struct to be filled by this function.
* @param status fills in the outgoing error code
* @return a pointer to a UResourceBundle struct. If fill in param was NULL, caller must delete it
* @stable
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_getNextResource(UResourceBundle *resourceBundle, UResourceBundle *fillIn, UErrorCode *status);
/**
* Returns the next string in a given resource or NULL if there are no more resources
* to iterate over.
*
* @param resourceBundle a resource
* @param len fill in length of the string
* @param key fill in for key associated with this string
* @param status fills in the outgoing error code
* @return a pointer to a zero-terminated UChar array which lives in a memory mapped/DLL file.
* @stable
*/
U_CAPI const UChar* U_EXPORT2 ures_getNextString(UResourceBundle *resourceBundle, int32_t* len, const char ** key, UErrorCode *status);
/**
* Returns the resource in a given resource at the specified index. Features a fill-in parameter.
*
* @param resourceBundle a resource
* @param indexR an index to the wanted resource.
* @param fillIn if NULL a new UResourceBundle struct is allocated and must be deleted by the caller.
* Alternatively, you can supply a struct to be filled by this function.
* @param status fills in the outgoing error code
* @return a pointer to a UResourceBundle struct. If fill in param was NULL, caller must delete it
* @stable
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_getByIndex(const UResourceBundle *resourceBundle, int32_t indexR, UResourceBundle *fillIn, UErrorCode *status);
/**
* Returns the string in a given resource at the specified index.
*
* @param resourceBundle a resource
* @param indexS an index to the wanted string.
* @param len fill in length of the string
* @param status fills in the outgoing error code
* @return a pointer to a zero-terminated UChar array which lives in a memory mapped/DLL file.
* @stable
*/
U_CAPI const UChar* U_EXPORT2 ures_getStringByIndex(const UResourceBundle *resB, int32_t indexS, int32_t* len, UErrorCode *status);
/**
* Returns a resource in a given resource that has a given key. This procedure works only with table
* resources. Features a fill-in parameter.
*
* @param resourceBundle a resource
* @param key a key associated with the wanted resource
* @param fillIn if NULL a new UResourceBundle struct is allocated and must be deleted by the caller.
* Alternatively, you can supply a struct to be filled by this function.
* @param status fills in the outgoing error code.
* @return a pointer to a UResourceBundle struct. If fill in param was NULL, caller must delete it
* @stable
*/
U_CAPI UResourceBundle* U_EXPORT2 ures_getByKey(const UResourceBundle *resourceBundle, const char* key, UResourceBundle *fillIn, UErrorCode *status);
/**
* Returns a string in a given resource that has a given key. This procedure works only with table
* resources.
*
* @param resB a resource
* @param key a key associated with the wanted string
* @param len fill in length of the string
* @param status fills in the outgoing error code
* @return a pointer to a zero-terminated UChar array which lives in a memory mapped/DLL file.
* @stable
*/
U_CAPI const UChar* U_EXPORT2 ures_getStringByKey(const UResourceBundle *resB, const char* key, int32_t* len, UErrorCode *status);
#ifdef XP_CPLUSPLUS
#include "unicode/unistr.h"
U_NAMESPACE_BEGIN
/**
* returns a string from a string resource type
*
* @param resB a resource
* @param status: fills in the outgoing error code
* could be <TT>U_MISSING_RESOURCE_ERROR</T> if the key is not found
* could be a non-failing error
* e.g.: <TT>U_USING_FALLBACK_ERROR</TT>,<TT>U_USING_DEFAULT_ERROR </TT>
* @return an UnicodeString object. If there is an error, string is bogus
* @draft ICU 2.0
*/
inline UnicodeString ures_getUnicodeString(const UResourceBundle *resB, UErrorCode* status) {
int32_t len = 0;
const UChar *r = ures_getString(resB, &len, status);
return UnicodeString(TRUE, r, len);
}
/**
* Returns the next string in a resource or NULL if there are no more resources
* to iterate over.
*
* @param resB a resource
* @param key fill in for key associated with this string
* @param status fills in the outgoing error code
* @return an UnicodeString object.
* @draft ICU 2.0
*/
inline UnicodeString ures_getNextUnicodeString(UResourceBundle *resB, const char ** key, UErrorCode* status) {
int32_t len = 0;
const UChar* r = ures_getNextString(resB, &len, key, status);
return UnicodeString(TRUE, r, len);
}
/**
* Returns the string in a given resource at the specified index.
*
* @param resB a resource
* @param index an index to the wanted string.
* @param status fills in the outgoing error code
* @return an UnicodeString object. If there is an error, string is bogus
* @draft ICU 2.0
*/
inline UnicodeString ures_getUnicodeStringByIndex(const UResourceBundle *resB, int32_t indexS, UErrorCode* status) {
int32_t len = 0;
const UChar* r = ures_getStringByIndex(resB, indexS, &len, status);
return UnicodeString(TRUE, r, len);
}
/**
* Returns a string in a resource that has a given key. This procedure works only with table
* resources.
*
* @param resB a resource
* @param key a key associated with the wanted string
* @param status fills in the outgoing error code
* @return an UnicodeString object. If there is an error, string is bogus
* @draft ICU 2.0
*/
inline UnicodeString ures_getUnicodeStringByKey(const UResourceBundle *resB, const char* key, UErrorCode* status) {
int32_t len = 0;
const UChar* r = ures_getStringByKey(resB, key, &len, status);
return UnicodeString(TRUE, r, len);
}
U_NAMESPACE_END
#endif
#endif /*_URES*/
/*eof*/
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