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Add ability to fetch a subconfig

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This commit is contained in:
Mike Bierlee 2022-09-24 20:05:15 +03:00
parent 2a5ae23576
commit 3c5f88b9fd
1 changed files with 63 additions and 26 deletions
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89
source/mirage/config.d
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@ -232,18 +232,57 @@ class ConfigDictionary {
* Returns: The value at the path in the configuration. To convert it use get!T().
*/
string get(string configPath) {
auto path = new ConfigPath(configPath);
auto node = getNodeAt(path);
auto value = cast(ValueNode) node;
if (value) {
return value.value;
} else {
throw new ConfigReadException(
"Value expected but " ~ node.nodeType ~ " found at path: " ~ createExceptionPath(
path));
}
}
/**
* Get values from the configuration and attempts to convert them to the specified type.
*
* Params:
* configPath = Path to the wanted config value. See get().
* Returns: The value at the path in the configuration.
*/
ConvertToType get(ConvertToType)(string configPath) {
return get(configPath).to!ConvertToType;
}
/**
* Fetch a sub-section of the config as another config.
*
* Commonly used for example to fetch further configuration from arrays, e.g.: `getConfig("http.servers[3]")`
* which then returns the rest of the config at that path.
*
* Params:
* configPath = Path to the wanted config. See get().
* Returns: A sub-section of the configuration.
*/
ConfigDictionary getConfig(string configPath) {
auto path = new ConfigPath(configPath);
auto node = getNodeAt(path);
return new ConfigDictionary(node);
}
string createExceptionPath(ConfigPath path) {
return "'" ~ path.path ~ "' (at '" ~ path.getCurrentPath() ~ "')";
}
private ConfigNode getNodeAt(ConfigPath path) {
enforce!ConfigReadException(rootNode !is null, "The config is empty");
auto path = new ConfigPath(configPath);
auto currentNode = rootNode;
PathSegment currentPathSegment = path.getNextSegment();
string createExceptionPath() {
return "'" ~ configPath ~ "' (at '" ~ path.getCurrentPath() ~ "')";
}
void throwPathNotExists() {
throw new ConfigReadException("Path does not exist: " ~ createExceptionPath());
throw new ConfigReadException("Path does not exist: " ~ createExceptionPath(path));
}
void ifNotNullPointer(void* obj, void delegate() fn) {
@ -278,7 +317,7 @@ class ConfigDictionary {
ifNotNull(arrayNode, {
if (arrayNode.children.length < arrayPath.index) {
throw new ConfigReadException(
"Array index out of bounds: " ~ createExceptionPath());
"Array index out of bounds: " ~ createExceptionPath(path));
}
currentNode = arrayNode.children[arrayPath.index];
@ -299,24 +338,7 @@ class ConfigDictionary {
currentPathSegment = path.getNextSegment();
}
auto value = cast(ValueNode) currentNode;
if (value) {
return value.value;
} else {
throw new ConfigReadException(
"Value expected but " ~ currentNode.nodeType ~ " found at path: " ~ createExceptionPath());
}
}
/**
* Get values from the configuration and attempts to convert them to the specified type.
*
* Params:
* configPath = Path to the wanted config value. See get().
* Returns: The value at the path in the configuration.
*/
ConvertToType get(ConvertToType)(string configPath) {
return get(configPath).to!ConvertToType;
return currentNode;
}
}
@ -377,7 +399,7 @@ version (unittest) {
@("Get value in root with just a dot")
unittest {
auto dictionary = new ConfigDictionary( new ValueNode("yup"));
auto dictionary = new ConfigDictionary(new ValueNode("yup"));
assert(dictionary.get(".") == "yup");
}
@ -555,4 +577,19 @@ version (unittest) {
assert(dictionary.get!string("tres") == "Hi you");
assert(isClose(dictionary.get!float("quatro"), 1.3));
}
@("Get config from array")
unittest {
auto dictionaryOne = new ConfigDictionary(new ObjectNode(
[
"servers": new ArrayNode([
new ObjectNode(["hostname": "lala.com"]),
new ObjectNode(["hostname": "lele.com"])
])
])
);
auto config = dictionaryOne.getConfig("servers[0]");
assert(config.get("hostname") == "lala.com");
}
}