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const definitions = require("../src/definitions");
const flatMap = require("array.prototype.flatmap");
const {
typeSignature,
iterateProps,
mapProps,
filterProps,
unique
} = require("./util");
const stdout = process.stdout;
const jsTypes = ["string", "number", "boolean"];
const quote = value => `"${value}"`;
function params(fields) {
const optionalDefault = field => (field.default ? ` = ${field.default}` : "");
return mapProps(fields)
.map(field => `${typeSignature(field)}${optionalDefault(field)}`)
.join(",");
}
function assertParamType({ assertNodeType, array, name, type }) {
if (array) {
// TODO - assert contents of array?
return `assert(typeof ${name} === "object" && typeof ${name}.length !== "undefined")\n`;
} else {
if (jsTypes.includes(type)) {
return `assert(
typeof ${name} === "${type}",
"Argument ${name} must be of type ${type}, given: " + typeof ${name}
)`;
}
if (assertNodeType === true) {
return `assert(
${name}.type === "${type}",
"Argument ${name} must be of type ${type}, given: " + ${name}.type
)`;
}
return "";
}
}
function assertParam(meta) {
const paramAssertion = assertParamType(meta);
if (paramAssertion === "") {
return "";
}
if (meta.maybe || meta.optional) {
return `
if (${meta.name} !== null && ${meta.name} !== undefined) {
${paramAssertion};
}
`;
} else {
return paramAssertion;
}
}
function assertParams(fields) {
return mapProps(fields)
.map(assertParam)
.join("\n");
}
function buildObject(typeDef) {
const optionalField = meta => {
if (meta.array) {
// omit optional array properties if the constructor function was supplied
// with an empty array
return `
if (typeof ${meta.name} !== "undefined" && ${meta.name}.length > 0) {
node.${meta.name} = ${meta.name};
}
`;
} else if (meta.type === "Object") {
// omit optional object properties if they have no keys
return `
if (typeof ${meta.name} !== "undefined" && Object.keys(${
meta.name
}).length !== 0) {
node.${meta.name} = ${meta.name};
}
`;
} else if (meta.type === "boolean") {
// omit optional boolean properties if they are not true
return `
if (${meta.name} === true) {
node.${meta.name} = true;
}
`;
} else {
return `
if (typeof ${meta.name} !== "undefined") {
node.${meta.name} = ${meta.name};
}
`;
}
};
const fields = mapProps(typeDef.fields)
.filter(f => !f.optional && !f.constant)
.map(f => f.name);
const constants = mapProps(typeDef.fields)
.filter(f => f.constant)
.map(f => `${f.name}: "${f.value}"`);
return `
const node: ${typeDef.flowTypeName || typeDef.name} = {
type: "${typeDef.name}",
${constants.concat(fields).join(",")}
}
${mapProps(typeDef.fields)
.filter(f => f.optional)
.map(optionalField)
.join("")}
`;
}
function lowerCamelCase(name) {
return name.substring(0, 1).toLowerCase() + name.substring(1);
}
function generate() {
stdout.write(`
// @flow
// THIS FILE IS AUTOGENERATED
// see scripts/generateNodeUtils.js
import { assert } from "mamacro";
function isTypeOf(t: string) {
return (n: Node) => n.type === t;
}
function assertTypeOf(t: string) {
return (n: Node) => assert(n.type === t);
}
`);
// Node builders
iterateProps(definitions, typeDefinition => {
stdout.write(`
export function ${lowerCamelCase(typeDefinition.name)} (
${params(filterProps(typeDefinition.fields, f => !f.constant))}
): ${typeDefinition.name} {
${assertParams(filterProps(typeDefinition.fields, f => !f.constant))}
${buildObject(typeDefinition)}
return node;
}
`);
});
// Node testers
iterateProps(definitions, typeDefinition => {
stdout.write(`
export const is${typeDefinition.name} =
isTypeOf("${typeDefinition.name}");
`);
});
// Node union type testers
const unionTypes = unique(
flatMap(mapProps(definitions).filter(d => d.unionType), d => d.unionType)
);
unionTypes.forEach(unionType => {
stdout.write(
`
export const is${unionType} = (node: Node) => ` +
mapProps(definitions)
.filter(d => d.unionType && d.unionType.includes(unionType))
.map(d => `is${d.name}(node) `)
.join("||") +
";\n\n"
);
});
// Node assertion
iterateProps(definitions, typeDefinition => {
stdout.write(`
export const assert${typeDefinition.name} =
assertTypeOf("${typeDefinition.name}");
`);
});
// a map from node type to its set of union types
stdout.write(
`
export const unionTypesMap = {` +
mapProps(definitions)
.filter(d => d.unionType)
.map(t => `"${t.name}": [${t.unionType.map(quote).join(",")}]\n`) +
`};
`
);
// an array of all node and union types
stdout.write(
`
export const nodeAndUnionTypes = [` +
mapProps(definitions)
.map(t => `"${t.name}"`)
.concat(unionTypes.map(quote))
.join(",") +
`];`
);
}
generate();