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/** * @fileoverview Helper class to aid in constructing fix commands. * @author Alan Pierce */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./ast-utils"); //------------------------------------------------------------------------------ // Public Interface //------------------------------------------------------------------------------ /** * A helper class to combine fix options into a fix command. Currently, it * exposes some "retain" methods that extend the range of the text being * replaced so that other fixes won't touch that region in the same pass. */ class FixTracker { /** * Create a new FixTracker. * @param {ruleFixer} fixer A ruleFixer instance. * @param {SourceCode} sourceCode A SourceCode object for the current code. */ constructor(fixer, sourceCode) { this.fixer = fixer; this.sourceCode = sourceCode; this.retainedRange = null; } /** * Mark the given range as "retained", meaning that other fixes may not * may not modify this region in the same pass. * @param {int[]} range The range to retain. * @returns {FixTracker} The same RuleFixer, for chained calls. */ retainRange(range) { this.retainedRange = range; return this; } /** * Given a node, find the function containing it (or the entire program) and * mark it as retained, meaning that other fixes may not modify it in this * pass. This is useful for avoiding conflicts in fixes that modify control * flow. * @param {ASTNode} node The node to use as a starting point. * @returns {FixTracker} The same RuleFixer, for chained calls. */ retainEnclosingFunction(node) { const functionNode = astUtils.getUpperFunction(node); return this.retainRange(functionNode ? functionNode.range : this.sourceCode.ast.range); } /** * Given a node or token, find the token before and afterward, and mark that * range as retained, meaning that other fixes may not modify it in this * pass. This is useful for avoiding conflicts in fixes that make a small * change to the code where the AST should not be changed. * @param {ASTNode|Token} nodeOrToken The node or token to use as a starting * point. The token to the left and right are use in the range. * @returns {FixTracker} The same RuleFixer, for chained calls. */ retainSurroundingTokens(nodeOrToken) { const tokenBefore = this.sourceCode.getTokenBefore(nodeOrToken) || nodeOrToken; const tokenAfter = this.sourceCode.getTokenAfter(nodeOrToken) || nodeOrToken; return this.retainRange([tokenBefore.range[0], tokenAfter.range[1]]); } /** * Create a fix command that replaces the given range with the given text, * accounting for any retained ranges. * @param {int[]} range The range to remove in the fix. * @param {string} text The text to insert in place of the range. * @returns {Object} The fix command. */ replaceTextRange(range, text) { let actualRange; if (this.retainedRange) { actualRange = [ Math.min(this.retainedRange[0], range[0]), Math.max(this.retainedRange[1], range[1]) ]; } else { actualRange = range; } return this.fixer.replaceTextRange( actualRange, this.sourceCode.text.slice(actualRange[0], range[0]) + text + this.sourceCode.text.slice(range[1], actualRange[1]) ); } /** * Create a fix command that removes the given node or token, accounting for * any retained ranges. * @param {ASTNode|Token} nodeOrToken The node or token to remove. * @returns {Object} The fix command. */ remove(nodeOrToken) { return this.replaceTextRange(nodeOrToken.range, ""); } } module.exports = FixTracker;