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