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app_vue/node_modules/eslint/lib/rules/no-multi-spaces.js

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+/**
+ * @fileoverview Disallow use of multiple spaces.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "disallow multiple spaces",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/no-multi-spaces"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    exceptions: {
+                        type: "object",
+                        patternProperties: {
+                            "^([A-Z][a-z]*)+$": {
+                                type: "boolean"
+                            }
+                        },
+                        additionalProperties: false
+                    },
+                    ignoreEOLComments: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            multipleSpaces: "Multiple spaces found before '{{displayValue}}'."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+        const options = context.options[0] || {};
+        const ignoreEOLComments = options.ignoreEOLComments;
+        const exceptions = Object.assign({ Property: true }, options.exceptions);
+        const hasExceptions = Object.keys(exceptions).filter(key => exceptions[key]).length > 0;
+
+        /**
+         * Formats value of given comment token for error message by truncating its length.
+         * @param {Token} token comment token
+         * @returns {string} formatted value
+         * @private
+         */
+        function formatReportedCommentValue(token) {
+            const valueLines = token.value.split("\n");
+            const value = valueLines[0];
+            const formattedValue = `${value.slice(0, 12)}...`;
+
+            return valueLines.length === 1 && value.length <= 12 ? value : formattedValue;
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            Program() {
+                sourceCode.tokensAndComments.forEach((leftToken, leftIndex, tokensAndComments) => {
+                    if (leftIndex === tokensAndComments.length - 1) {
+                        return;
+                    }
+                    const rightToken = tokensAndComments[leftIndex + 1];
+
+                    // Ignore tokens that don't have 2 spaces between them or are on different lines
+                    if (
+                        !sourceCode.text.slice(leftToken.range[1], rightToken.range[0]).includes("  ") ||
+                        leftToken.loc.end.line < rightToken.loc.start.line
+                    ) {
+                        return;
+                    }
+
+                    // Ignore comments that are the last token on their line if `ignoreEOLComments` is active.
+                    if (
+                        ignoreEOLComments &&
+                        astUtils.isCommentToken(rightToken) &&
+                        (
+                            leftIndex === tokensAndComments.length - 2 ||
+                            rightToken.loc.end.line < tokensAndComments[leftIndex + 2].loc.start.line
+                        )
+                    ) {
+                        return;
+                    }
+
+                    // Ignore tokens that are in a node in the "exceptions" object
+                    if (hasExceptions) {
+                        const parentNode = sourceCode.getNodeByRangeIndex(rightToken.range[0] - 1);
+
+                        if (parentNode && exceptions[parentNode.type]) {
+                            return;
+                        }
+                    }
+
+                    let displayValue;
+
+                    if (rightToken.type === "Block") {
+                        displayValue = `/*${formatReportedCommentValue(rightToken)}*/`;
+                    } else if (rightToken.type === "Line") {
+                        displayValue = `//${formatReportedCommentValue(rightToken)}`;
+                    } else {
+                        displayValue = rightToken.value;
+                    }
+
+                    context.report({
+                        node: rightToken,
+                        loc: { start: leftToken.loc.end, end: rightToken.loc.start },
+                        messageId: "multipleSpaces",
+                        data: { displayValue },
+                        fix: fixer => fixer.replaceTextRange([leftToken.range[1], rightToken.range[0]], " ")
+                    });
+                });
+            }
+        };
+
+    }
+};