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