65 lines
2.7 KiB
TypeScript
65 lines
2.7 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {PullApproveGroup} from './group';
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import {PullApproveGroupArray, PullApproveStringArray} from './pullapprove_arrays';
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import {getOrCreateGlob} from './utils';
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/**
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* Context that is provided to conditions. Conditions can use various helpers
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* that PullApprove provides. We try to mock them here. Consult the official
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* docs for more details: https://docs.pullapprove.com/config/conditions.
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*/
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const conditionContext = {
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'len': (value: any[]) => value.length,
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'contains_any_globs': (files: PullApproveStringArray, patterns: string[]) => {
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// Note: Do not always create globs for the same pattern again. This method
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// could be called for each source file. Creating glob's is expensive.
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return files.some(f => patterns.some(pattern => getOrCreateGlob(pattern).match(f)));
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},
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};
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/**
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* Converts a given condition to a function that accepts a set of files. The returned
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* function can be called to check if the set of files matches the condition.
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*/
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export function convertConditionToFunction(expr: string): (
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files: string[], groups: PullApproveGroup[]) => boolean {
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// Creates a dynamic function with the specified expression.
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// The first parameter will be `files` as that corresponds to the supported `files` variable that
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// can be accessed in PullApprove condition expressions. The second parameter is the list of
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// PullApproveGroups that are accessible in the condition expressions. The followed parameters
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// correspond to other context variables provided by PullApprove for conditions.
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const evaluateFn = new Function('files', 'groups', ...Object.keys(conditionContext), `
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return (${transformExpressionToJs(expr)});
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`);
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// Create a function that calls the dynamically constructed function which mimics
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// the condition expression that is usually evaluated with Python in PullApprove.
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return (files, groups) => {
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const result = evaluateFn(
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new PullApproveStringArray(...files), new PullApproveGroupArray(...groups),
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...Object.values(conditionContext));
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// If an array is returned, we consider the condition as active if the array is not
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// empty. This matches PullApprove's condition evaluation that is based on Python.
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if (Array.isArray(result)) {
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return result.length !== 0;
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}
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return !!result;
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};
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}
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/**
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* Transforms a condition expression from PullApprove that is based on python
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* so that it can be run inside JavaScript. Current transformations:
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* 1. `not <..>` -> `!<..>`
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*/
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function transformExpressionToJs(expression: string): string {
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return expression.replace(/not\s+/g, '!');
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}
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