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export default {
meta: {
type: 'layout',
docs: {
description: 'enforce spacing inside parentheses for control structures only',
category: 'Stylistic Issues',
},
fixable: 'whitespace',
schema: [],
messages: {
missingSpaceAfterOpen: 'Missing space after opening parenthesis in control structure.',
missingSpaceBeforeClose: 'Missing space before closing parenthesis in control structure.',
unexpectedSpaceAfterOpen: 'Unexpected space after opening parenthesis in function call.',
unexpectedSpaceBeforeClose: 'Unexpected space before closing parenthesis in function call.',
},
},
create (context) {
const sourceCode = context.getSourceCode();
function checkControlStructureSpacing (node) {
// For control structures, we need to find the parentheses around the condition/test
let conditionNode;
if ( node.type === 'IfStatement' || node.type === 'WhileStatement' || node.type === 'DoWhileStatement' ) {
conditionNode = node.test;
} else if ( node.type === 'ForStatement' || node.type === 'ForInStatement' || node.type === 'ForOfStatement' ) {
// For loops, we want the parentheses around the entire for clause
conditionNode = node;
} else if ( node.type === 'SwitchStatement' ) {
conditionNode = node.discriminant;
} else if ( node.type === 'CatchClause' ) {
conditionNode = node.param;
}
if ( ! conditionNode ) return;
// Find the opening paren - it should be right before the condition starts
const openParen = sourceCode.getTokenBefore(conditionNode, token => token.value === '(');
if ( !openParen || openParen.value !== '(' ) return;
// Find the closing paren - it should be right after the condition ends
const closeParen = sourceCode.getTokenAfter(conditionNode, token => token.value === ')');
if ( !closeParen || closeParen.value !== ')' ) return;
const afterOpen = sourceCode.getTokenAfter(openParen);
const beforeClose = sourceCode.getTokenBefore(closeParen);
{
const contentBetweenParens = sourceCode.getText().slice(openParen.range[1], closeParen.range[0]);
const isSingleCharVariable = /^\s*[a-zA-Z_$]\s*$/.test(contentBetweenParens);
// Skip spacing requirements for single character variables
if ( isSingleCharVariable ) {
return;
}
}
// Control structures should have spacing
if ( afterOpen && openParen.range[1] === afterOpen.range[0] ) {
context.report({
node,
loc: openParen.loc,
messageId: 'missingSpaceAfterOpen',
fix (fixer) {
return fixer.insertTextAfter(openParen, ' ');
},
});
}
if ( beforeClose && beforeClose.range[1] === closeParen.range[0] ) {
context.report({
node,
loc: closeParen.loc,
messageId: 'missingSpaceBeforeClose',
fix (fixer) {
return fixer.insertTextBefore(closeParen, ' ');
},
});
}
}
function checkForLoopSpacing (node) {
// For loops are special - we need to find the opening paren after the 'for' keyword
// and the closing paren before the body
const forKeyword = sourceCode.getFirstToken(node);
if ( !forKeyword || forKeyword.value !== 'for' ) return;
const openParen = sourceCode.getTokenAfter(forKeyword, token => token.value === '(');
if ( ! openParen ) return;
// The closing paren should be right before the body
const closeParen = sourceCode.getTokenBefore(node.body, token => token.value === ')');
if ( ! closeParen ) return;
const afterOpen = sourceCode.getTokenAfter(openParen);
const beforeClose = sourceCode.getTokenBefore(closeParen);
if ( afterOpen && openParen.range[1] === afterOpen.range[0] ) {
context.report({
node,
loc: openParen.loc,
messageId: 'missingSpaceAfterOpen',
fix (fixer) {
return fixer.insertTextAfter(openParen, ' ');
},
});
}
if ( beforeClose && beforeClose.range[1] === closeParen.range[0] ) {
context.report({
node,
loc: closeParen.loc,
messageId: 'missingSpaceBeforeClose',
fix (fixer) {
return fixer.insertTextBefore(closeParen, ' ');
},
});
}
}
function checkFunctionCallSpacing (node) {
// Find the opening parenthesis for this function call
const openParen = sourceCode.getFirstToken(node, token => token.value === '(');
const closeParen = sourceCode.getLastToken(node, token => token.value === ')');
if ( !openParen || !closeParen ) return;
const afterOpen = sourceCode.getTokenAfter(openParen);
const beforeClose = sourceCode.getTokenBefore(closeParen);
// Function calls should NOT have spacing
if ( afterOpen && openParen.range[1] !== afterOpen.range[0] ) {
const spaceAfter = sourceCode.getText().slice(openParen.range[1], afterOpen.range[0]);
if ( /^\s+$/.test(spaceAfter) ) {
context.report({
node,
loc: openParen.loc,
messageId: 'unexpectedSpaceAfterOpen',
fix (fixer) {
return fixer.removeRange([openParen.range[1], afterOpen.range[0]]);
},
});
}
}
if ( beforeClose && beforeClose.range[1] !== closeParen.range[0] ) {
const spaceBefore = sourceCode.getText().slice(beforeClose.range[1], closeParen.range[0]);
if ( /^\s+$/.test(spaceBefore) ) {
context.report({
node,
loc: closeParen.loc,
messageId: 'unexpectedSpaceBeforeClose',
fix (fixer) {
return fixer.removeRange([beforeClose.range[1], closeParen.range[0]]);
},
});
}
}
}
return {
// Control structures that should have spacing
IfStatement (node) {
checkControlStructureSpacing(node);
},
WhileStatement (node) {
checkControlStructureSpacing(node);
},
DoWhileStatement (node) {
checkControlStructureSpacing(node);
},
SwitchStatement (node) {
checkControlStructureSpacing(node);
},
CatchClause (node) {
if ( node.param ) {
checkControlStructureSpacing(node);
}
},
// For loops need special handling
ForStatement (node) {
checkForLoopSpacing(node);
},
ForInStatement (node) {
checkForLoopSpacing(node);
},
ForOfStatement (node) {
checkForLoopSpacing(node);
},
// Function calls that should NOT have spacing
CallExpression (node) {
checkFunctionCallSpacing(node);
},
NewExpression (node) {
if ( node.arguments.length > 0 || sourceCode.getLastToken(node).value === ')' ) {
checkFunctionCallSpacing(node);
}
},
};
},
}; |