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node_modules/eslint/lib/rules/semi-spacing.js

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+/**
+ * @fileoverview Validates spacing before and after semicolon
+ * @author Mathias Schreck
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before and after semicolons",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/semi-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    before: {
+                        type: "boolean",
+                        default: false
+                    },
+                    after: {
+                        type: "boolean",
+                        default: true
+                    }
+                },
+                additionalProperties: false
+            }
+        ]
+    },
+
+    create(context) {
+
+        const config = context.options[0],
+            sourceCode = context.getSourceCode();
+        let requireSpaceBefore = false,
+            requireSpaceAfter = true;
+
+        if (typeof config === "object") {
+            requireSpaceBefore = config.before;
+            requireSpaceAfter = config.after;
+        }
+
+        /**
+         * Checks if a given token has leading whitespace.
+         * @param {Object} token The token to check.
+         * @returns {boolean} True if the given token has leading space, false if not.
+         */
+        function hasLeadingSpace(token) {
+            const tokenBefore = sourceCode.getTokenBefore(token);
+
+            return tokenBefore && astUtils.isTokenOnSameLine(tokenBefore, token) && sourceCode.isSpaceBetweenTokens(tokenBefore, token);
+        }
+
+        /**
+         * Checks if a given token has trailing whitespace.
+         * @param {Object} token The token to check.
+         * @returns {boolean} True if the given token has trailing space, false if not.
+         */
+        function hasTrailingSpace(token) {
+            const tokenAfter = sourceCode.getTokenAfter(token);
+
+            return tokenAfter && astUtils.isTokenOnSameLine(token, tokenAfter) && sourceCode.isSpaceBetweenTokens(token, tokenAfter);
+        }
+
+        /**
+         * Checks if the given token is the last token in its line.
+         * @param {Token} token The token to check.
+         * @returns {boolean} Whether or not the token is the last in its line.
+         */
+        function isLastTokenInCurrentLine(token) {
+            const tokenAfter = sourceCode.getTokenAfter(token);
+
+            return !(tokenAfter && astUtils.isTokenOnSameLine(token, tokenAfter));
+        }
+
+        /**
+         * Checks if the given token is the first token in its line
+         * @param {Token} token The token to check.
+         * @returns {boolean} Whether or not the token is the first in its line.
+         */
+        function isFirstTokenInCurrentLine(token) {
+            const tokenBefore = sourceCode.getTokenBefore(token);
+
+            return !(tokenBefore && astUtils.isTokenOnSameLine(token, tokenBefore));
+        }
+
+        /**
+         * Checks if the next token of a given token is a closing parenthesis.
+         * @param {Token} token The token to check.
+         * @returns {boolean} Whether or not the next token of a given token is a closing parenthesis.
+         */
+        function isBeforeClosingParen(token) {
+            const nextToken = sourceCode.getTokenAfter(token);
+
+            return (nextToken && astUtils.isClosingBraceToken(nextToken) || astUtils.isClosingParenToken(nextToken));
+        }
+
+        /**
+         * Reports if the given token has invalid spacing.
+         * @param {Token} token The semicolon token to check.
+         * @param {ASTNode} node The corresponding node of the token.
+         * @returns {void}
+         */
+        function checkSemicolonSpacing(token, node) {
+            if (astUtils.isSemicolonToken(token)) {
+                const location = token.loc.start;
+
+                if (hasLeadingSpace(token)) {
+                    if (!requireSpaceBefore) {
+                        context.report({
+                            node,
+                            loc: location,
+                            message: "Unexpected whitespace before semicolon.",
+                            fix(fixer) {
+                                const tokenBefore = sourceCode.getTokenBefore(token);
+
+                                return fixer.removeRange([tokenBefore.range[1], token.range[0]]);
+                            }
+                        });
+                    }
+                } else {
+                    if (requireSpaceBefore) {
+                        context.report({
+                            node,
+                            loc: location,
+                            message: "Missing whitespace before semicolon.",
+                            fix(fixer) {
+                                return fixer.insertTextBefore(token, " ");
+                            }
+                        });
+                    }
+                }
+
+                if (!isFirstTokenInCurrentLine(token) && !isLastTokenInCurrentLine(token) && !isBeforeClosingParen(token)) {
+                    if (hasTrailingSpace(token)) {
+                        if (!requireSpaceAfter) {
+                            context.report({
+                                node,
+                                loc: location,
+                                message: "Unexpected whitespace after semicolon.",
+                                fix(fixer) {
+                                    const tokenAfter = sourceCode.getTokenAfter(token);
+
+                                    return fixer.removeRange([token.range[1], tokenAfter.range[0]]);
+                                }
+                            });
+                        }
+                    } else {
+                        if (requireSpaceAfter) {
+                            context.report({
+                                node,
+                                loc: location,
+                                message: "Missing whitespace after semicolon.",
+                                fix(fixer) {
+                                    return fixer.insertTextAfter(token, " ");
+                                }
+                            });
+                        }
+                    }
+                }
+            }
+        }
+
+        /**
+         * Checks the spacing of the semicolon with the assumption that the last token is the semicolon.
+         * @param {ASTNode} node The node to check.
+         * @returns {void}
+         */
+        function checkNode(node) {
+            const token = sourceCode.getLastToken(node);
+
+            checkSemicolonSpacing(token, node);
+        }
+
+        return {
+            VariableDeclaration: checkNode,
+            ExpressionStatement: checkNode,
+            BreakStatement: checkNode,
+            ContinueStatement: checkNode,
+            DebuggerStatement: checkNode,
+            ReturnStatement: checkNode,
+            ThrowStatement: checkNode,
+            ImportDeclaration: checkNode,
+            ExportNamedDeclaration: checkNode,
+            ExportAllDeclaration: checkNode,
+            ExportDefaultDeclaration: checkNode,
+            ForStatement(node) {
+                if (node.init) {
+                    checkSemicolonSpacing(sourceCode.getTokenAfter(node.init), node);
+                }
+
+                if (node.test) {
+                    checkSemicolonSpacing(sourceCode.getTokenAfter(node.test), node);
+                }
+            }
+        };
+    }
+};