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nodeConverters.ts
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137 lines (125 loc) · 5.88 KB
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/* @internal */
namespace ts {
export function createNodeConverters(factory: NodeFactory): NodeConverters {
return {
convertToFunctionBlock,
convertToFunctionExpression,
convertToArrayAssignmentElement,
convertToObjectAssignmentElement,
convertToAssignmentPattern,
convertToObjectAssignmentPattern,
convertToArrayAssignmentPattern,
convertToAssignmentElementTarget,
};
function convertToFunctionBlock(node: ConciseBody, multiLine?: boolean): Block {
if (isBlock(node)) return node;
const returnStatement = factory.createReturnStatement(node);
setTextRange(returnStatement, node);
const body = factory.createBlock([returnStatement], multiLine);
setTextRange(body, node);
return body;
}
function convertToFunctionExpression(node: FunctionDeclaration) {
if (!node.body) return Debug.fail(`Cannot convert a FunctionDeclaration without a body`);
const updated = factory.createFunctionExpression(
node.modifiers,
node.asteriskToken,
node.name,
node.typeParameters,
node.parameters,
node.type,
node.body
);
setOriginalNode(updated, node);
setTextRange(updated, node);
if (getStartsOnNewLine(node)) {
setStartsOnNewLine(updated, /*newLine*/ true);
}
return updated;
}
function convertToArrayAssignmentElement(element: ArrayBindingOrAssignmentElement) {
if (isBindingElement(element)) {
if (element.dotDotDotToken) {
Debug.assertNode(element.name, isIdentifier);
return setOriginalNode(setTextRange(factory.createSpreadElement(element.name), element), element);
}
const expression = convertToAssignmentElementTarget(element.name);
return element.initializer
? setOriginalNode(
setTextRange(
factory.createAssignment(expression, element.initializer),
element
),
element
)
: expression;
}
return cast(element, isExpression);
}
function convertToObjectAssignmentElement(element: ObjectBindingOrAssignmentElement) {
if (isBindingElement(element)) {
if (element.dotDotDotToken) {
Debug.assertNode(element.name, isIdentifier);
return setOriginalNode(setTextRange(factory.createSpreadAssignment(element.name), element), element);
}
if (element.propertyName) {
const expression = convertToAssignmentElementTarget(element.name);
return setOriginalNode(setTextRange(factory.createPropertyAssignment(element.propertyName, element.initializer ? factory.createAssignment(expression, element.initializer) : expression), element), element);
}
Debug.assertNode(element.name, isIdentifier);
return setOriginalNode(setTextRange(factory.createShorthandPropertyAssignment(element.name, element.initializer), element), element);
}
return cast(element, isObjectLiteralElementLike);
}
function convertToAssignmentPattern(node: BindingOrAssignmentPattern): AssignmentPattern {
switch (node.kind) {
case SyntaxKind.ArrayBindingPattern:
case SyntaxKind.ArrayLiteralExpression:
return convertToArrayAssignmentPattern(node);
case SyntaxKind.ObjectBindingPattern:
case SyntaxKind.ObjectLiteralExpression:
return convertToObjectAssignmentPattern(node);
}
}
function convertToObjectAssignmentPattern(node: ObjectBindingOrAssignmentPattern) {
if (isObjectBindingPattern(node)) {
return setOriginalNode(
setTextRange(
factory.createObjectLiteralExpression(map(node.elements, convertToObjectAssignmentElement)),
node
),
node
);
}
return cast(node, isObjectLiteralExpression);
}
function convertToArrayAssignmentPattern(node: ArrayBindingOrAssignmentPattern) {
if (isArrayBindingPattern(node)) {
return setOriginalNode(
setTextRange(
factory.createArrayLiteralExpression(map(node.elements, convertToArrayAssignmentElement)),
node
),
node
);
}
return cast(node, isArrayLiteralExpression);
}
function convertToAssignmentElementTarget(node: BindingOrAssignmentElementTarget): Expression {
if (isBindingPattern(node)) {
return convertToAssignmentPattern(node);
}
return cast(node, isExpression);
}
}
export const nullNodeConverters: NodeConverters = {
convertToFunctionBlock: notImplemented,
convertToFunctionExpression: notImplemented,
convertToArrayAssignmentElement: notImplemented,
convertToObjectAssignmentElement: notImplemented,
convertToAssignmentPattern: notImplemented,
convertToObjectAssignmentPattern: notImplemented,
convertToArrayAssignmentPattern: notImplemented,
convertToAssignmentElementTarget: notImplemented,
};
}