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visitor.ts
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visitor.ts
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import * as ts from 'typescript';
import * as tsutils from 'tsutils';
import { VisitorContext } from './visitor-context';
function reportNode(node: ts.Node) {
const sourceFile = node.getSourceFile();
const { line, character } = sourceFile.getLineAndCharacterOfPosition(node.getStart());
return `${sourceFile.fileName}:${line + 1}:${character + 1}`;
}
function stringifyTypeNodes(nodes: ts.NodeArray<ts.TypeNode> | undefined, visitorContext: VisitorContext): string {
return nodes === undefined ? '' : '<' + nodes.map((node) => stringifyTypeNode(node, visitorContext)).join(',') + '>';
}
function stringifyTypeNode(node: ts.TypeNode, visitorContext: VisitorContext): string {
if (node.kind === ts.SyntaxKind.NumberKeyword) {
return 'number';
} else if (node.kind === ts.SyntaxKind.StringKeyword) {
return 'string';
} else if (node.kind === ts.SyntaxKind.BooleanKeyword) {
return 'boolean';
} else if (ts.isTypeReferenceNode(node)) {
const type = visitorContext.checker.getTypeFromTypeNode(node);
const fqn = visitorContext.checker.getFullyQualifiedName(type.symbol);
const typeArgumentsPostfix = stringifyTypeNodes(node.typeArguments, visitorContext);
return fqn + typeArgumentsPostfix;
} else if (ts.isLiteralTypeNode(node)) {
if (ts.isStringLiteral(node.literal)) {
return JSON.stringify(node.literal.text);
} else {
throw new Error('Unsupported LiteralTypeNode kind: ' + node.kind);
}
} else {
throw new Error('Unsupported TypeNode kind: ' + node.kind);
}
}
function constructArrowFunction(identifier: ts.Identifier, returnExpression: ts.Expression) {
return ts.createArrowFunction(
undefined,
undefined,
[
ts.createParameter(
undefined,
undefined,
undefined,
identifier
)
],
undefined,
undefined,
ts.createBlock([ts.createReturn(returnExpression)])
);
}
function visitNumberKeyword(node: ts.TypeNode, accessor: ts.Expression, visitorContext: VisitorContext) {
return ts.createStrictEquality(ts.createTypeOf(accessor), ts.createStringLiteral('number'));
}
function visitBooleanKeyword(node: ts.TypeNode, accessor: ts.Expression, visitorContext: VisitorContext) {
return ts.createStrictEquality(ts.createTypeOf(accessor), ts.createStringLiteral('boolean'));
}
function visitStringKeyword(node: ts.TypeNode, accessor: ts.Expression, visitorContext: VisitorContext) {
return ts.createStrictEquality(ts.createTypeOf(accessor), ts.createStringLiteral('string'));
}
function visitInterfaceDeclaration(node: ts.InterfaceDeclaration, accessor: ts.Expression, visitorContext: VisitorContext): ts.Expression {
const typeArguments = visitorContext.typeArgumentsStack[visitorContext.typeArgumentsStack.length - 1];
const conditions: ts.Expression[] = [];
conditions.push(ts.createStrictEquality(ts.createTypeOf(accessor), ts.createStringLiteral('object')));
conditions.push(ts.createStrictInequality(accessor, ts.createNull()));
const typeParameterTypes = node.typeParameters === undefined
? undefined
: node.typeParameters.map((typeParameter) => visitorContext.checker.getTypeAtLocation(typeParameter));
if (node.heritageClauses) {
for (const heritageClause of node.heritageClauses) {
for (const heritageType of heritageClause.types) {
if (ts.isIdentifier(heritageType.expression)) {
const heritageTypeArguments = heritageType.typeArguments === undefined
? undefined
: heritageType.typeArguments.map((typeArgument) => {
const type = visitorContext.checker.getTypeFromTypeNode(typeArgument);
let typeNode = typeArgument;
if (typeArguments !== undefined && typeParameterTypes !== undefined) {
const index = typeParameterTypes.findIndex((typeParameterType) => typeParameterType === type);
if (index >= 0) {
typeNode = typeArguments[index];
}
}
return typeNode;
});
const type = visitorContext.checker.getTypeAtLocation(heritageType.expression);
visitorContext.typeArgumentsStack.push(ts.createNodeArray(heritageTypeArguments));
const expression = type.symbol.declarations
.map((declaration) => visitDeclaration(declaration, accessor, visitorContext))
.reduce((condition, expression) =>
ts.createBinary(
condition,
ts.SyntaxKind.AmpersandAmpersandToken,
expression
)
);
conditions.push(expression);
visitorContext.typeArgumentsStack.pop();
} else {
throw new Error('Expected heritage type expression to be an identifier.');
}
}
}
}
for (const member of node.members) {
if (ts.isPropertySignature(member)) {
const memberAccessor = ts.createPropertyAccess(accessor, tsutils.getPropertyName(member.name));
if (member.type !== undefined) {
let typeNode = member.type;
if (typeArguments !== undefined) {
const type = visitorContext.checker.getTypeFromTypeNode(member.type);
let matchedTypeArgumentIndex = -1;
if (typeParameterTypes !== undefined) {
matchedTypeArgumentIndex = typeParameterTypes.findIndex((typeParameterType) => typeParameterType === type);
}
if (matchedTypeArgumentIndex >= 0) {
typeNode = typeArguments[matchedTypeArgumentIndex];
}
}
// TODO: member optional
conditions.push(visitTypeNode(typeNode, memberAccessor, visitorContext));
}
}
}
return conditions.reduce((condition, expression) =>
ts.createBinary(
condition,
ts.SyntaxKind.AmpersandAmpersandToken,
expression
)
);
}
function visitDeclaration(node: ts.Declaration, accessor: ts.Expression, visitorContext: VisitorContext): ts.Expression {
const typeCheckFunctionAccessorTopLevel = visitorContext.typeCheckFunctionAccessorTopLevel;
const typeArguments = visitorContext.typeArgumentsStack[visitorContext.typeArgumentsStack.length - 1];
const type = visitorContext.checker.getTypeAtLocation(node);
const fqn = visitorContext.checker.getFullyQualifiedName(type.symbol);
const typeArgumentsPostfix = stringifyTypeNodes(typeArguments, visitorContext);
const name = fqn + typeArgumentsPostfix;
if (!(name in visitorContext.typeDefinitions)) {
const accessor = ts.createIdentifier('object');
let expression: ts.Expression;
if (ts.isInterfaceDeclaration(node)) {
expression = visitInterfaceDeclaration(node, accessor, visitorContext);
} else if (ts.isTypeParameterDeclaration(node)) {
throw new Error('Unbound type parameter: ' + node.getText() + ' at ' + reportNode(node));
} else {
throw new Error('Unsupported declaration kind: ' + node.kind);
}
visitorContext.typeCheckFunctionAccessorTopLevel = null;
visitorContext.typeDefinitions[name] = constructArrowFunction(
accessor,
expression
);
visitorContext.typeCheckFunctionAccessorTopLevel = typeCheckFunctionAccessorTopLevel;
}
return ts.createCall(
typeCheckFunctionAccessorTopLevel !== null
? typeCheckFunctionAccessorTopLevel
: visitorContext.typeCheckFunctionAccessor,
undefined,
[
accessor,
ts.createStringLiteral(name)
]
);
}
function visitTypeReferenceNode(node: ts.TypeReferenceNode, accessor: ts.Expression, visitorContext: VisitorContext): ts.Expression {
const type = visitorContext.checker.getTypeFromTypeNode(node);
visitorContext.typeArgumentsStack.push(node.typeArguments);
const expression = type.symbol.declarations
.map((declaration) => visitDeclaration(declaration, accessor, visitorContext))
.reduce((condition, expression) => ts.createBinary(condition, ts.SyntaxKind.AmpersandAmpersandToken, expression));
visitorContext.typeArgumentsStack.pop();
return expression;
}
function visitLiteralTypeNode(node: ts.LiteralTypeNode, accessor: ts.Expression, visitorContext: VisitorContext) {
if (ts.isStringLiteral(node.literal)) {
return ts.createStrictEquality(accessor, ts.createStringLiteral(node.literal.text));
} else {
throw new Error('Unsupported LiteralTypeNode kind: ' + node.kind);
}
}
export function visitTypeNode(node: ts.TypeNode, accessor: ts.Expression, visitorContext: VisitorContext) {
/* if (node.kind === ts.SyntaxKind.AnyKeyword) {
name = 'any';
} else if (node.kind === ts.SyntaxKind.UnknownKeyword) {
name = 'unknown';
} else*/
if (node.kind === ts.SyntaxKind.NumberKeyword) {
return visitNumberKeyword(node, accessor, visitorContext);
/*} else if (node.kind === ts.SyntaxKind.ObjectKeyword) {
name = 'object';*/
} else if (node.kind === ts.SyntaxKind.BooleanKeyword) {
return visitBooleanKeyword(node, accessor, visitorContext);
} else if (node.kind === ts.SyntaxKind.StringKeyword) {
return visitStringKeyword(node, accessor, visitorContext);
/*} else if (node.kind === ts.SyntaxKind.VoidKeyword) {
name = 'void';
} else if (node.kind === ts.SyntaxKind.UndefinedKeyword) {
name = 'undefined';
} else if (node.kind === ts.SyntaxKind.NullKeyword) {
name = 'null';
} else if (node.kind === ts.SyntaxKind.NeverKeyword) {
name = 'never';
}*/
} else if (ts.isTypeReferenceNode(node)) {
return visitTypeReferenceNode(node, accessor, visitorContext);
} else if (ts.isLiteralTypeNode(node)) {
return visitLiteralTypeNode(node, accessor, visitorContext);
} else {
throw new Error('Unsupported TypeNode kind: ' + node.kind);
}
}