71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
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'use strict';
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module.exports = babelCore => {
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const t = babelCore.types;
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const wrapArg = babelCore.template('(START(t, ASSERTION, FILE, LINE), END(t, ARG))');
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const helpers = babelCore.template(`function START(t, assertion, file, line) {
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if (t._throwsArgStart) {
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t._throwsArgStart(assertion, file, line);
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}
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}
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function END(t, arg) {
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if (t._throwsArgEnd) {
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t._throwsArgEnd();
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}
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return arg;
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}`);
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const assertionVisitor = {
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CallExpression(path, state) {
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const callee = path.get('callee');
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if (!callee.isMemberExpression() || !callee.get('object').isIdentifier({name: 't'}) || !callee.get('property').isIdentifier()) {
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return;
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}
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const assertion = callee.get('property').get('name').node;
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if (assertion !== 'throws' && assertion !== 'notThrows') {
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return;
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}
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const arg0 = path.node.arguments[0];
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if (!(arg0 && arg0.loc && (typeof arg0.start === 'number') && (typeof arg0.end === 'number'))) {
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return;
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}
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// Wrap the argument expression, so that the stack trace of the assertion
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// isn't affected.
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path.node.arguments[0] = wrapArg(Object.assign({
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ARG: arg0,
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ASSERTION: t.stringLiteral(assertion),
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FILE: t.stringLiteral(state.file.opts.filename),
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LINE: t.numericLiteral(arg0.loc.start.line)
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}, this.installHelper())).expression;
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}
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};
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return {
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visitor: {
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Program(path, state) {
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const START = t.identifier(path.scope.generateUid('avaThrowsHelperStart'));
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const END = t.identifier(path.scope.generateUid('avaThrowsHelperEnd'));
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const helperIdentifiers = {START, END};
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let created = false;
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path.traverse(assertionVisitor, {
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installHelper() {
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if (!created) {
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created = true;
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path.unshiftContainer('body', helpers(helperIdentifiers));
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}
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return helperIdentifiers;
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},
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file: state.file
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});
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}
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}
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};
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};
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