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* @fileoverview Rule to disallow whitespace before the semicolon
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* @author Jonathan Kingston
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* @copyright 2015 Mathias Schreck
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* @copyright 2014 Jonathan Kingston
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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module.exports = function(context) {
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* Determines whether two adjacent tokens are have whitespace between them.
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* @param {Object} left - The left token object.
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* @param {Object} right - The right token object.
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* @returns {boolean} Whether or not there is space between the tokens.
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function isSpaced(left, right) {
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return left.range[1] < right.range[0];
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* Checks whether two tokens are on the same line.
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* @param {Object} left The leftmost token.
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* @param {Object} right The rightmost token.
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* @returns {boolean} True if the tokens are on the same line, false if not.
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function isSameLine(left, right) {
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return left.loc.end.line === right.loc.start.line;
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* Checks if a given token has leading whitespace.
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* @param {Object} token The token to check.
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* @returns {boolean} True if the given token has leading space, false if not.
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function hasLeadingSpace(token) {
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var tokenBefore = context.getTokenBefore(token);
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return isSameLine(tokenBefore, token) && isSpaced(tokenBefore, token);
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* Checks if the given token is a semicolon.
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* @param {Token} token The token to check.
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* @returns {boolean} Whether or not the given token is a semicolon.
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function isSemicolon(token) {
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return token.type === "Punctuator" && token.value === ";";
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* Reports if the given token has leading space.
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* @param {Token} token The semicolon token to check.
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* @param {ASTNode} node The corresponding node of the token.
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function checkSemiTokenForLeadingSpace(token, node) {
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if (isSemicolon(token) && hasLeadingSpace(token)) {
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context.report(node, token.loc.start, "Unexpected whitespace before semicolon.");
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* Checks leading space before the semicolon with the assumption that the last token is the semicolon.
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* @param {ASTNode} node The node to check.
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function checkNode(node) {
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var token = context.getLastToken(node);
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checkSemiTokenForLeadingSpace(token, node);
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"VariableDeclaration": checkNode,
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"ExpressionStatement": checkNode,
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"BreakStatement": checkNode,
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"ContinueStatement": checkNode,
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"DebuggerStatement": checkNode,
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"ReturnStatement": checkNode,
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"ThrowStatement": checkNode,
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"ForStatement": function (node) {
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checkSemiTokenForLeadingSpace(context.getTokenAfter(node.init), node);
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checkSemiTokenForLeadingSpace(context.getTokenAfter(node.test), node);
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module.exports.schema = [];