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