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Add return of default values

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Mike Bierlee 2022-09-29 00:38:54 +03:00
parent 3ae90783de
commit 3c7918c2e2
1 changed files with 86 additions and 25 deletions
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91
source/mirage/config.d
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@ -30,6 +30,15 @@ class ConfigReadException : Exception {
}
}
/**
* Used by ConfigDictionary when the supplied path does not exist.
*/
class ConfigPathNotFoundException : Exception {
this(string msg, string file = __FILE__, size_t line = __LINE__) {
super(msg, file, line);
}
}
/**
* Used by ConfigFactory instances when loading or parsing configuration fails.
*/
@ -246,10 +255,15 @@ class ConfigDictionary {
* Although the path should be universally the same over all types of config files, some might not lend to this structure,
* and have a more specific way of retrieving data from the config. See the examples and specific config factories for
* more details.
* defaultValue = (Optional) Value to return when the given configPath is invalid. When not supplied a ConfigPathNotFoundException exception is thrown.
*
* Throws: ConfigReadException when something goes wrong reading the config.
* ConfigPathNotFoundException when the given path does not exist in the config.
*
* Returns: The value at the path in the configuration. To convert it use get!T().
*/
string get(string configPath) {
string get(string configPath, string defaultValue = null) {
try {
auto path = new ConfigPath(configPath);
auto node = getNodeAt(path);
auto value = cast(ValueNode) node;
@ -260,6 +274,13 @@ class ConfigDictionary {
"Value expected but " ~ node.nodeType ~ " found at path: " ~ createExceptionPath(
path));
}
} catch (ConfigPathNotFoundException e) {
if (defaultValue !is null) {
return defaultValue;
}
throw e;
}
}
/**
@ -267,12 +288,38 @@ class ConfigDictionary {
*
* Params:
* configPath = Path to the wanted config value. See get().
*
* Throws: ConfigReadException when something goes wrong reading the config.
* ConfigPathNotFoundException when the given path does not exist in the config.
*
* Returns: The value at the path in the configuration.
* See_Also: get
*/
ConvertToType get(ConvertToType)(string configPath) {
return get(configPath).to!ConvertToType;
}
/**
* Get values from the configuration and attempts to convert them to the specified type.
*
* Params:
* configPath = Path to the wanted config value. See get().
* defaultValue = (Optional) Value to return when the given configPath is invalid. When not supplied a ConfigPathNotFoundException exception is thrown.
*
* Throws: ConfigReadException when something goes wrong reading the config.
* ConfigPathNotFoundException when the given path does not exist in the config.
*
* Returns: The value at the path in the configuration.
* See_Also: get
*/
ConvertToType get(ConvertToType)(string configPath, ConvertToType defaultValue) {
try {
return get(configPath).to!ConvertToType;
} catch (ConfigPathNotFoundException e) {
return defaultValue;
}
}
/**
* Fetch a sub-section of the config as another config.
*
@ -294,20 +341,23 @@ class ConfigDictionary {
}
private ConfigNode getNodeAt(ConfigPath path) {
enforce!ConfigReadException(rootNode !is null, "The config is empty");
void throwPathNotFound() {
throw new ConfigPathNotFoundException(
"Path does not exist: " ~ createExceptionPath(path));
}
if (rootNode is null) {
throwPathNotFound();
}
auto currentNode = rootNode;
PathSegment currentPathSegment = path.getNextSegment();
void throwPathNotExists() {
throw new ConfigReadException("Path does not exist: " ~ createExceptionPath(path));
}
void ifNotNullPointer(void* obj, void delegate() fn) {
if (obj) {
fn();
} else {
throwPathNotExists();
throwPathNotFound();
}
}
@ -315,18 +365,18 @@ class ConfigDictionary {
if (obj) {
fn();
} else {
throwPathNotExists();
throwPathNotFound();
}
}
while (currentPathSegment !is null) {
if (currentNode is null) {
throwPathNotExists();
throwPathNotFound();
}
auto valueNode = cast(ValueNode) currentNode;
if (valueNode) {
throwPathNotExists();
throwPathNotFound();
}
auto arrayPath = cast(ArrayPathSegment) currentPathSegment;
@ -485,7 +535,7 @@ version (unittest) {
unittest {
auto config = new ConfigDictionary();
assertThrown!ConfigReadException(config.get("."));
assertThrown!ConfigPathNotFoundException(config.get("."));
}
@("Get value in root with empty path")
@ -586,7 +636,7 @@ version (unittest) {
])
);
assertThrown!ConfigReadException(config.get("hostname.cluster.spacey"));
assertThrown!ConfigPathNotFoundException(config.get("hostname.cluster.spacey"));
}
@("Exception is thrown when given path terminates too early")
@ -604,7 +654,7 @@ version (unittest) {
unittest {
auto config = new ConfigDictionary(new ArrayNode());
assertThrown!ConfigReadException(config.get("hostname"));
assertThrown!ConfigPathNotFoundException(config.get("hostname"));
}
@("Get value from objects in array")
@ -789,8 +839,19 @@ version (unittest) {
assert(config.get("tooMuchWhiteSpace") == "$MIRAGE_CONFIG_TEST_ENV_VAR ");
assert(config.get("notSet") == "${MIRAGE_CONFIG_NOT_SET_TEST_ENV_VAR}");
assert(config.get("withDefault") == "$MIRAGE_CONFIG_NOT_SET_TEST_ENV_VAR:use default!");
assert(config.get("withDefaultAndBrackets") == "${MIRAGE_CONFIG_NOT_SET_TEST_ENV_VAR:use default!}");
assert(config.get(
"withDefaultAndBrackets") == "${MIRAGE_CONFIG_NOT_SET_TEST_ENV_VAR:use default!}");
assert(config.get("megaMix") == "${MIRAGE_CONFIG_TEST_ENV_VAR_TWO} ${MIRAGE_CONFIG_TEST_ENV_VAR} ${MIRAGE_CONFIG_NOT_SET_TEST_ENV_VAR:go}!");
assert(config.get("typical") == "${MIRAGE_CONFIG_TEST_HOSTNAME:localhost}:${MIRAGE_CONFIG_TEST_PORT:8080}");
assert(config.get(
"typical") == "${MIRAGE_CONFIG_TEST_HOSTNAME:localhost}:${MIRAGE_CONFIG_TEST_PORT:8080}");
}
@("Get with default should return default")
unittest {
auto config = new ConfigDictionary();
assert(config.get("la.la.la", "not there") == "not there");
assert(config.get!int("do.re.mi.fa.so", 42) == 42);
}
//TODO: Test null nodes should gracefully fail
}