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generator.ts
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generator.ts
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import {
getTypes,
ParamTransform,
parseSQLFile,
parseTypeScriptFile,
prettyPrintEvents,
processTSQueryAST,
processSQLQueryAST,
SQLQueryAST,
TSQueryAST,
} from '@pgtyped/query';
import { camelCase } from 'camel-case';
import { pascalCase } from 'pascal-case';
import { ProcessingMode } from './index';
import { DefaultTypeMapping, TypeAllocator } from './types';
import { ParsedConfig } from './config';
import path from 'path';
export interface IField {
fieldName: string;
fieldType: string;
}
const interfaceGen = (interfaceName: string, contents: string) =>
`export interface ${interfaceName} {
${contents}
}\n\n`;
export const generateInterface = (interfaceName: string, fields: IField[]) => {
const contents = fields
.map(({ fieldName, fieldType }) => ` ${fieldName}: ${fieldType};`)
.join('\n');
return interfaceGen(interfaceName, contents);
};
export const generateTypeAlias = (typeName: string, alias: string) =>
`export type ${typeName} = ${alias};\n\n`;
type ParsedQuery =
| {
ast: TSQueryAST;
mode: ProcessingMode.TS;
}
| {
ast: SQLQueryAST;
mode: ProcessingMode.SQL;
};
export async function queryToTypeDeclarations(
parsedQuery: ParsedQuery,
connection: any,
types: TypeAllocator,
config: ParsedConfig,
): Promise<string> {
let queryData;
let queryName;
if (parsedQuery.mode === ProcessingMode.TS) {
queryName = pascalCase(parsedQuery.ast.name);
queryData = processTSQueryAST(parsedQuery.ast);
} else {
queryName = pascalCase(parsedQuery.ast.name);
queryData = processSQLQueryAST(parsedQuery.ast);
}
const typeData = await getTypes(queryData, connection);
const interfaceName = pascalCase(queryName);
if ('errorCode' in typeData) {
// tslint:disable-next-line:no-console
console.error('Error in query. Details: %o', typeData);
const returnInterface = generateTypeAlias(
`I${interfaceName}Result`,
'never',
);
const paramInterface = generateTypeAlias(
`I${interfaceName}Params`,
'never',
);
const resultErrorComment = `/** Query '${queryName}' is invalid, so its result is assigned type 'never' */\n`;
const paramErrorComment = `/** Query '${queryName}' is invalid, so its parameters are assigned type 'never' */\n`;
return `${resultErrorComment}${returnInterface}${paramErrorComment}${paramInterface}`;
}
const { returnTypes, paramMetadata } = typeData;
const returnFieldTypes: IField[] = [];
const paramFieldTypes: IField[] = [];
returnTypes.forEach(({ returnName, type, nullable }) => {
let tsTypeName = types.use(type);
if (nullable || nullable == null) {
tsTypeName += ' | null';
}
returnFieldTypes.push({
fieldName: config.camelCaseColumnNames
? camelCase(returnName)
: returnName,
fieldType: tsTypeName,
});
});
const { params } = paramMetadata;
for (const param of paramMetadata.mapping) {
if (
param.type === ParamTransform.Scalar ||
param.type === ParamTransform.Spread
) {
const isArray = param.type === ParamTransform.Spread;
const assignedIndex =
param.assignedIndex instanceof Array
? param.assignedIndex[0]
: param.assignedIndex;
const pgTypeName = params[assignedIndex - 1];
let tsTypeName = types.use(pgTypeName);
if (!param.required) {
tsTypeName += ' | null | void';
}
paramFieldTypes.push({
fieldName: param.name,
fieldType: isArray ? `readonly (${tsTypeName})[]` : tsTypeName,
});
} else {
const isArray = param.type === ParamTransform.PickSpread;
let fieldType = Object.values(param.dict)
.map((p) => {
const paramType = types.use(params[p.assignedIndex - 1]);
return p.required
? ` ${p.name}: ${paramType}`
: ` ${p.name}: ${paramType} | null | void`;
})
.join(',\n');
fieldType = `{\n${fieldType}\n }`;
if (isArray) {
fieldType = `readonly (${fieldType})[]`;
}
paramFieldTypes.push({
fieldName: param.name,
fieldType,
});
}
}
// TypeAllocator errors are currently considered non-fatal since a `never`
// type is emitted which can be caught later when compiling the generated
// code
// tslint:disable-next-line:no-console
types.errors.forEach((err) => console.log(err));
const resultInterfaceName = `I${interfaceName}Result`;
const returnTypesInterface =
`/** '${queryName}' return type */\n` +
(returnFieldTypes.length > 0
? generateInterface(`I${interfaceName}Result`, returnFieldTypes)
: generateTypeAlias(resultInterfaceName, 'void'));
const paramInterfaceName = `I${interfaceName}Params`;
const paramTypesInterface =
`/** '${queryName}' parameters type */\n` +
(paramFieldTypes.length > 0
? generateInterface(`I${interfaceName}Params`, paramFieldTypes)
: generateTypeAlias(paramInterfaceName, 'void'));
const typePairInterface =
`/** '${queryName}' query type */\n` +
generateInterface(`I${interfaceName}Query`, [
{ fieldName: 'params', fieldType: paramInterfaceName },
{ fieldName: 'result', fieldType: resultInterfaceName },
]);
return [paramTypesInterface, returnTypesInterface, typePairInterface].join(
'',
);
}
type ITypedQuery =
| {
mode: 'ts';
fileName: string;
query: {
name: string;
ast: TSQueryAST;
};
typeDeclaration: string;
}
| {
mode: 'sql';
fileName: string;
query: {
name: string;
ast: SQLQueryAST;
paramTypeAlias: string;
returnTypeAlias: string;
};
typeDeclaration: string;
};
async function generateTypedecsFromFile(
contents: string,
fileName: string,
connection: any,
mode: 'ts' | 'sql',
types: TypeAllocator = new TypeAllocator(DefaultTypeMapping),
config: ParsedConfig,
): Promise<ITypedQuery[]> {
const results: ITypedQuery[] = [];
const { queries, events } =
mode === 'ts'
? parseTypeScriptFile(contents, fileName)
: parseSQLFile(contents);
if (events.length > 0) {
prettyPrintEvents(contents, events);
if (events.find((e) => 'critical' in e)) {
return results;
}
}
for (const queryAST of queries) {
let typedQuery: ITypedQuery;
if (mode === 'sql') {
const sqlQueryAST = queryAST as SQLQueryAST;
const result = await queryToTypeDeclarations(
{ ast: sqlQueryAST, mode: ProcessingMode.SQL },
connection,
types,
config,
);
typedQuery = {
mode: 'sql' as const,
query: {
name: camelCase(sqlQueryAST.name),
ast: sqlQueryAST,
paramTypeAlias: `I${pascalCase(sqlQueryAST.name)}Params`,
returnTypeAlias: `I${pascalCase(sqlQueryAST.name)}Result`,
},
fileName,
typeDeclaration: result,
};
} else {
const tsQueryAST = queryAST as TSQueryAST;
const result = await queryToTypeDeclarations(
{
ast: tsQueryAST,
mode: ProcessingMode.TS,
},
connection,
types,
config,
);
typedQuery = {
mode: 'ts' as const,
fileName,
query: {
name: tsQueryAST.name,
ast: tsQueryAST,
},
typeDeclaration: result,
};
}
results.push(typedQuery);
}
return results;
}
export async function generateDeclarationFile(
contents: string,
fileName: string,
connection: any,
mode: 'ts' | 'sql',
types: TypeAllocator = new TypeAllocator(DefaultTypeMapping),
config: ParsedConfig,
): Promise<{ typeDecs: ITypedQuery[]; declarationFileContents: string }> {
if (mode === 'sql') {
types.use({ name: 'PreparedQuery', from: '@pgtyped/query' });
}
const typeDecs = await generateTypedecsFromFile(
contents,
fileName,
connection,
mode,
types,
config,
);
// file paths in generated files must be stable across platforms
// https://github.com/adelsz/pgtyped/issues/230
const isWindowsPath = path.sep === '\\';
// always emit POSIX paths
const stableFilePath = isWindowsPath
? fileName.replace(/\\/g, '/')
: fileName;
let declarationFileContents = '';
declarationFileContents += `/** Types generated for queries found in "${stableFilePath}" */\n`;
declarationFileContents += types.declaration();
declarationFileContents += '\n';
for (const typeDec of typeDecs) {
declarationFileContents += typeDec.typeDeclaration;
if (typeDec.mode === 'ts') {
continue;
}
const queryPP = typeDec.query.ast.statement.body
.split('\n')
.map((s: string) => ' * ' + s)
.join('\n');
declarationFileContents += `const ${
typeDec.query.name
}IR: any = ${JSON.stringify(typeDec.query.ast)};\n\n`;
declarationFileContents +=
`/**\n` +
` * Query generated from SQL:\n` +
` * \`\`\`\n` +
`${queryPP}\n` +
` * \`\`\`\n` +
` */\n`;
declarationFileContents +=
`export const ${typeDec.query.name} = ` +
`new PreparedQuery<${typeDec.query.paramTypeAlias},${typeDec.query.returnTypeAlias}>` +
`(${typeDec.query.name}IR);\n\n\n`;
}
return { declarationFileContents, typeDecs };
}