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/**
* @fileoverview Rule to enforce the number of spaces after certain keywords
* @author Nick Fisher
* @copyright 2014 Nick Fisher. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
// unless the first option is `"never"`, then a space is required
var requiresSpace = context.options[0] !== "never";
/**
* Check if the separation of two adjacent tokens meets the spacing rules, and report a problem if not.
*
* @param {ASTNode} node The node to which the potential problem belongs.
* @param {Token} left The first token.
* @param {Token} right The second token
* @returns {void}
*/
function checkTokens(node, left, right) {
var hasSpace = left.range[1] < right.range[0],
value = left.value;
if (hasSpace !== requiresSpace) {
context.report(node, "Keyword \"{{value}}\" must {{not}}be followed by whitespace.", {
value: value,
not: requiresSpace ? "" : "not "
});
}
}
/**
* Check if the given node (`if`, `for`, `while`, etc), has the correct spacing after it.
* @param {ASTNode} node The node to check.
* @returns {void}
*/
function check(node) {
var tokens = context.getFirstTokens(node, 2);
checkTokens(node, tokens[0], tokens[1]);
}
return {
"IfStatement": function (node) {
check(node);
// check the `else`
if (node.alternate && node.alternate.type !== "IfStatement") {
checkTokens(node.alternate, context.getTokenBefore(node.alternate), context.getFirstToken(node.alternate));
}
},
"ForStatement": check,
"ForOfStatement": check,
"ForInStatement": check,
"WhileStatement": check,
"DoWhileStatement": function (node) {
check(node);
// check the `while`
var whileTokens = context.getTokensAfter(node.body, 2);
checkTokens(node, whileTokens[0], whileTokens[1]);
},
"SwitchStatement": check,
"TryStatement": function (node) {
check(node);
// check the `finally`
if (node.finalizer) {
checkTokens(node.finalizer, context.getTokenBefore(node.finalizer), context.getFirstToken(node.finalizer));
}
},
"CatchStatement": check,
"WithStatement": check
};
};
module.exports.schema = [
{
"enum": ["always", "never"]
}
];
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