| CTPL Reference Manual | ||||
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| Top | Description | ||||
#include <ctpl/ctpl.h> #define CTPL_ENVIRON_ERROR enum CtplEnvironError; CtplEnviron; gboolean (*CtplEnvironForeachFunc) (CtplEnviron *env,const gchar *symbol,const CtplValue *value,gpointer user_data); CtplEnviron * ctpl_environ_new (void); CtplEnviron * ctpl_environ_ref (CtplEnviron *env); void ctpl_environ_unref (CtplEnviron *env); const CtplValue * ctpl_environ_lookup (const CtplEnviron *env,const gchar *symbol); void ctpl_environ_push (CtplEnviron *env,const gchar *symbol,const CtplValue *value); void ctpl_environ_push_int (CtplEnviron *env,const gchar *symbol,glong value); void ctpl_environ_push_float (CtplEnviron *env,const gchar *symbol,gdouble value); void ctpl_environ_push_string (CtplEnviron *env,const gchar *symbol,const gchar *value); gboolean ctpl_environ_pop (CtplEnviron *env,const gchar *symbol,CtplValue **poped_value); void ctpl_environ_foreach (CtplEnviron *env,CtplEnvironForeachFunc func,gpointer user_data); void ctpl_environ_merge (CtplEnviron *env,const CtplEnviron *source,gboolean merge_symbols); gboolean ctpl_environ_add_from_stream (CtplEnviron *env,CtplInputStream *stream,GError **error); gboolean ctpl_environ_add_from_path (CtplEnviron *env,const gchar *path,GError **error); gboolean ctpl_environ_add_from_string (CtplEnviron *env,const gchar *string,GError **error);
A CtplEnviron represents an environment of symbols used to lookup, push and pop symbols when computing a template.
Use ctpl_environ_new() to create a new environment; and then
ctpl_environ_push(), ctpl_environ_push_int(), ctpl_environ_push_float() and
ctpl_environ_push_string() to fill it.
CtplEnviron uses a GObject-style refcounting, via
ctpl_environ_ref() and ctpl_environ_unref().
Example 10. Creating and filling a environment
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CtplEnviron *env; env = ctpl_environ_new () ctpl_environ_push_string (env, "symbol name", "symbol value"); ctpl_environ_push_int (env, "response", 42); /* ... */ ctpl_environ_unref (env); |
Environments can also be loaded from CtplInputStreams, strings or
files using ctpl_environ_add_from_stream(), ctpl_environ_add_from_string() or
ctpl_environ_add_from_path(). Environment descriptions are of the form
SYMBOL = VALUE; and can contain comments. Comments start with a
# (number sign) and end at the next line ending.
For more details, see the environment description syntax.
#define CTPL_ENVIRON_ERROR (ctpl_environ_error_quark ())
Error domain of CtplEnviron.
typedef enum _CtplEnvironError
{
CTPL_ENVIRON_ERROR_LOADER_MISSING_SYMBOL,
CTPL_ENVIRON_ERROR_LOADER_MISSING_VALUE,
CTPL_ENVIRON_ERROR_LOADER_MISSING_SEPARATOR,
CTPL_ENVIRON_ERROR_FAILED
} CtplEnvironError;
Errors in the CTPL_ENVIRON_ERROR domain.
gboolean (*CtplEnvironForeachFunc) (CtplEnviron *env,const gchar *symbol,const CtplValue *value,gpointer user_data);
User function for ctpl_environ_foreach().
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The CtplEnviron on which the function was called |
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The current symbol |
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The symbol's value |
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User data passed to ctpl_environ_foreach()
|
Returns : |
TRUE to continue enumerating environ, FALSE to stop. |
CtplEnviron * ctpl_environ_new (void);
Creates a new CtplEnviron.
Returns : |
A new CtplEnviron |
CtplEnviron * ctpl_environ_ref (CtplEnviron *env);
Adds a reference to a CtplEnviron.
|
a CtplEnviron |
Returns : |
The environ |
Since 0.3
void ctpl_environ_unref (CtplEnviron *env);
Removes a reference from a CtplEnviron. If the reference count drops to 0, frees the environ and all its allocated resources.
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a CtplEnviron |
Since 0.3
const CtplValue * ctpl_environ_lookup (const CtplEnviron *env,const gchar *symbol);
Looks up for a symbol in the given CtplEnviron.
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A CtplEnviron |
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A symbol name |
Returns : |
The CtplValue holding the symbol's value, or NULL if the symbol
can't be found. This value should not be modified or freed. |
void ctpl_environ_push (CtplEnviron *env,const gchar *symbol,const CtplValue *value);
Pushes a symbol into a CtplEnviron. Pushing a symbol adds it or overwrites the value in place for it while keeping any already present value for latter poping. The push/pop concept is simple as a stack: when you push, you add a value on the top of a stack, and when you pop, you remove the top element of this stack, revealing the previous value.
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A CtplEnviron |
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The symbol name |
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The symbol value |
void ctpl_environ_push_int (CtplEnviron *env,const gchar *symbol,glong value);
Pushes an integer symbol into a CtplEnviron. See ctpl_environ_push().
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A CtplEnviron |
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A symbol name |
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The symbol value |
void ctpl_environ_push_float (CtplEnviron *env,const gchar *symbol,gdouble value);
Pushes a float symbol into a CtplEnviron. See ctpl_environ_push().
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A CtplEnviron |
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A symbol name |
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The symbol value |
void ctpl_environ_push_string (CtplEnviron *env,const gchar *symbol,const gchar *value);
Pushes a string symbol into a CtplEnviron. See ctpl_environ_push().
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A CtplEnviron |
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A symbol name |
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The symbol value |
gboolean ctpl_environ_pop (CtplEnviron *env,const gchar *symbol,CtplValue **poped_value);
Tries to pop a symbol from a CtplEnviron. See ctpl_environ_push() for
details on pushing and poping.
Use ctpl_environ_lookup() if you want to get the symbol's value without
poping it from the environ.
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A CtplEnviron |
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A symbol name |
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Return location for the poped value, or
NULL. You must free this value with ctpl_value_free() when you
no longer need it. This is set only if poping succeeded, so if
this function returned TRUE. [out][allow-none]
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Returns : |
Whether a value has been poped. |
Since 0.3
void ctpl_environ_foreach (CtplEnviron *env,CtplEnvironForeachFunc func,gpointer user_data);
Calls func on each symbol of the environment.
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A CtplEnviron |
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A CtplEnvironForeachFunc |
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user data to pass to func
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void ctpl_environ_merge (CtplEnviron *env,const CtplEnviron *source,gboolean merge_symbols);
Merges an environment into another. If a symbol of the source environ already
exists in the destination one, its value is either pushed if merge_symbols
is true or ignored if FALSE.
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A CtplEnviron |
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Source environ to merge with env
|
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Whether to merge symbols that exists in both environs |
gboolean ctpl_environ_add_from_stream (CtplEnviron *env,CtplInputStream *stream,GError **error);
Loads an environment description from a CtplInputStream.
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A CtplEnviron to fill |
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A CtplInputStream from where read the environment description. |
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Return location for an error, or NULL to ignore them |
Returns : |
TRUE on success, FALSE otherwise. |
gboolean ctpl_environ_add_from_path (CtplEnviron *env,const gchar *path,GError **error);
Loads an environment description from a path.
See ctpl_environ_add_from_stream().
Errors can come from the G_IO_ERROR domain if the file loading failed, or
from the CTPL_ENVIRON_ERROR domain if the parsing of the environment
description failed.
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A CtplEnviron to fill |
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The path of the file from which load the environment description, in the GLib's filename encoding |
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Return location for an error, or NULL to ignore them |
Returns : |
TRUE on success, FALSE otherwise. |
gboolean ctpl_environ_add_from_string (CtplEnviron *env,const gchar *string,GError **error);
Loads an environment description from a string.
See ctpl_environ_add_from_stream().
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A CtplEnviron to fill |
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A string containing an environment description |
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Return location for an error, or NULL to ignore them |
Returns : |
TRUE on success, FALSE otherwise. |