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traverse-helpers.js
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traverse-helpers.js
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import { storyNameFromExport } from '@storybook/router/utils';
import { handleADD, handleSTORYOF, patchNode, handleExportedName } from './parse-helpers';
const estraverse = require('estraverse');
export function splitSTORYOF(ast, source) {
let lastIndex = 0;
const parts = [source];
estraverse.traverse(ast, {
fallback: 'iteration',
enter: node => {
patchNode(node);
if (node.type === 'CallExpression') {
lastIndex = handleSTORYOF(node, parts, source, lastIndex);
}
},
});
return parts;
}
export function splitExports(ast, source) {
const parts = [];
let lastIndex = 0;
estraverse.traverse(ast, {
fallback: 'iteration',
enter: node => {
patchNode(node);
if (
node.type === 'ExportNamedDeclaration' &&
node.declaration &&
node.declaration.declarations &&
node.declaration.declarations.length === 1 &&
node.declaration.declarations[0].type === 'VariableDeclarator' &&
node.declaration.declarations[0].id &&
node.declaration.declarations[0].id.name &&
node.declaration.declarations[0].init &&
['CallExpression', 'ArrowFunctionExpression', 'FunctionExpression'].includes(
node.declaration.declarations[0].init.type
)
) {
const functionNode = node.declaration.declarations[0].init;
parts.push(source.substring(lastIndex, functionNode.start - 1));
parts.push(source.substring(functionNode.start, functionNode.end));
lastIndex = functionNode.end;
}
},
});
if (source.length > lastIndex + 1) parts.push(source.substring(lastIndex + 1));
if (parts.length === 1) return [source];
return parts;
}
export function findAddsMap(ast, storiesOfIdentifiers) {
const addsMap = {};
const idsToFrameworks = {};
estraverse.traverse(ast, {
fallback: 'iteration',
enter: (node, parent) => {
patchNode(node);
if (node.type === 'MemberExpression') {
const { toAdd, idToFramework } = handleADD(node, parent, storiesOfIdentifiers);
Object.assign(addsMap, toAdd);
Object.assign(idsToFrameworks, idToFramework);
}
},
});
return { addsMap, idsToFrameworks };
}
export function findExportsMap(ast) {
const addsMap = {};
const idsToFrameworks = {};
const metaDeclaration =
ast &&
ast.program &&
ast.program.body &&
ast.program.body.find(
d =>
d.type === 'ExportDefaultDeclaration' &&
d.declaration.type === 'ObjectExpression' &&
(d.declaration.properties || []).length
);
const titleProperty =
metaDeclaration &&
metaDeclaration.declaration &&
metaDeclaration.declaration.properties.find(p => p.key && p.key.name === 'title');
if (!titleProperty) {
return { addsMap, idsToFrameworks };
}
const title = titleProperty.value.value;
estraverse.traverse(ast, {
fallback: 'iteration',
enter: node => {
patchNode(node);
if (
node.type === 'ExportNamedDeclaration' &&
node.declaration &&
node.declaration.declarations &&
node.declaration.declarations.length === 1 &&
node.declaration.declarations[0].type === 'VariableDeclarator' &&
node.declaration.declarations[0].id &&
node.declaration.declarations[0].id.name &&
node.declaration.declarations[0].init &&
['CallExpression', 'ArrowFunctionExpression', 'FunctionExpression'].includes(
node.declaration.declarations[0].init.type
)
) {
const storyName = storyNameFromExport(node.declaration.declarations[0].id.name);
const toAdd = handleExportedName(title, storyName, node.declaration.declarations[0].init);
Object.assign(addsMap, toAdd);
}
},
});
return { addsMap, idsToFrameworks };
}
export function findDependencies(ast) {
const dependencies = [];
const storiesOfIdentifiers = {};
estraverse.traverse(ast, {
fallback: 'iteration',
enter: node => {
patchNode(node);
if (node.type === 'ImportDeclaration') {
const candidateSpecifier = (node.specifiers || []).find(
s => (s.imported || {}).name === 'storiesOf'
);
if (node.source.value.startsWith('@storybook/') && candidateSpecifier) {
Object.assign(storiesOfIdentifiers, {
[candidateSpecifier.local.name]: node.source.value,
});
}
dependencies.push(node.source.value);
}
},
});
return { dependencies, storiesOfIdentifiers };
}
export function popParametersObjectFromDefaultExport(source, ast) {
let splicedSource = source;
let parametersSliceOfCode = '';
let indexWhereToAppend = -1;
let foundParametersProperty = false;
estraverse.traverse(ast, {
fallback: 'iteration',
enter: node => {
patchNode(node);
if (
node.type === 'ExportDefaultDeclaration' &&
node.declaration.type === 'ObjectExpression' &&
(node.declaration.properties || []).length
) {
const parametersProperty = node.declaration.properties.find(
p => p.key.name === 'parameters' && p.value.type === 'ObjectExpression'
);
foundParametersProperty = !!parametersProperty;
if (foundParametersProperty) {
patchNode(parametersProperty.value);
} else {
patchNode(node.declaration);
}
splicedSource = parametersProperty
? source.substring(0, parametersProperty.value.start) +
source.substring(parametersProperty.value.end + 1)
: splicedSource;
parametersSliceOfCode = parametersProperty
? source.substring(parametersProperty.value.start, parametersProperty.value.end)
: '{}';
indexWhereToAppend = parametersProperty
? parametersProperty.value.start
: node.declaration.start + 1;
}
},
});
return { splicedSource, parametersSliceOfCode, indexWhereToAppend, foundParametersProperty };
}