120 lines
4.1 KiB
JavaScript
120 lines
4.1 KiB
JavaScript
/**
|
|
* @fileoverview Helper class to aid in constructing fix commands.
|
|
* @author Alan Pierce
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const astUtils = require("../util/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;
|