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/**
* @fileoverview Config file operations. This file must be usable in the browser,
* so no Node-specific code can be here.
* @author Nicholas C. Zakas
*/
//------------------------------------------------------------------------------
// Private
//------------------------------------------------------------------------------
const RULE_SEVERITY_STRINGS = ["off", "warn", "error"],
RULE_SEVERITY = RULE_SEVERITY_STRINGS.reduce((map, value, index) => {
map[value] = index;
return map;
}, {}),
VALID_SEVERITIES = [0, 1, 2, "off", "warn", "error"];
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Normalizes the severity value of a rule's configuration to a number
* @param {(number|string|[number, ...*]|[string, ...*])} ruleConfig A rule's configuration value, generally
* received from the user. A valid config value is either 0, 1, 2, the string "off" (treated the same as 0),
* the string "warn" (treated the same as 1), the string "error" (treated the same as 2), or an array
* whose first element is one of the above values. Strings are matched case-insensitively.
* @returns {(0|1|2)} The numeric severity value if the config value was valid, otherwise 0.
*/
function getRuleSeverity(ruleConfig) {
const severityValue = Array.isArray(ruleConfig) ? ruleConfig[0] : ruleConfig;
if (severityValue === 0 || severityValue === 1 || severityValue === 2) {
return severityValue;
}
if (typeof severityValue === "string") {
return RULE_SEVERITY[severityValue.toLowerCase()] || 0;
}
return 0;
}
/**
* Converts old-style severity settings (0, 1, 2) into new-style
* severity settings (off, warn, error) for all rules. Assumption is that severity
* values have already been validated as correct.
* @param {Object} config The config object to normalize.
* @returns {void}
*/
function normalizeToStrings(config) {
if (config.rules) {
Object.keys(config.rules).forEach(ruleId => {
const ruleConfig = config.rules[ruleId];
if (typeof ruleConfig === "number") {
config.rules[ruleId] = RULE_SEVERITY_STRINGS[ruleConfig] || RULE_SEVERITY_STRINGS[0];
} else if (Array.isArray(ruleConfig) && typeof ruleConfig[0] === "number") {
ruleConfig[0] = RULE_SEVERITY_STRINGS[ruleConfig[0]] || RULE_SEVERITY_STRINGS[0];
}
});
}
}
/**
* Determines if the severity for the given rule configuration represents an error.
* @param {int|string|Array} ruleConfig The configuration for an individual rule.
* @returns {boolean} True if the rule represents an error, false if not.
*/
function isErrorSeverity(ruleConfig) {
return getRuleSeverity(ruleConfig) === 2;
}
/**
* Checks whether a given config has valid severity or not.
* @param {number|string|Array} ruleConfig The configuration for an individual rule.
* @returns {boolean} `true` if the configuration has valid severity.
*/
function isValidSeverity(ruleConfig) {
let severity = Array.isArray(ruleConfig) ? ruleConfig[0] : ruleConfig;
if (typeof severity === "string") {
severity = severity.toLowerCase();
}
return VALID_SEVERITIES.indexOf(severity) !== -1;
}
/**
* Checks whether every rule of a given config has valid severity or not.
* @param {Object} config The configuration for rules.
* @returns {boolean} `true` if the configuration has valid severity.
*/
function isEverySeverityValid(config) {
return Object.keys(config).every(ruleId => isValidSeverity(config[ruleId]));
}
/**
* Normalizes a value for a global in a config
* @param {(boolean|string|null)} configuredValue The value given for a global in configuration or in
* a global directive comment
* @returns {("readable"|"writeable"|"off")} The value normalized as a string
* @throws Error if global value is invalid
*/
function normalizeConfigGlobal(configuredValue) {
switch (configuredValue) {
case "off":
return "off";
case true:
case "true":
case "writeable":
case "writable":
return "writable";
case null:
case false:
case "false":
case "readable":
case "readonly":
return "readonly";
default:
throw new Error(`'${configuredValue}' is not a valid configuration for a global (use 'readonly', 'writable', or 'off')`);
}
}
export {
getRuleSeverity,
normalizeToStrings,
isErrorSeverity,
isValidSeverity,
isEverySeverityValid,
normalizeConfigGlobal
};
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