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StringTypes.ts
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StringTypes.ts
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import {
mapMap,
iterableFirst,
setIntersect,
hashCodeOf,
areEqual,
mapMergeWithInto,
definedMap,
addHashCode,
setUnionInto
} from "collection-utils";
import { TypeAttributeKind } from "./TypeAttributes";
import { defined, assert } from "./support/Support";
import { StringTypeMapping, stringTypeMappingGet } from "./TypeBuilder";
import { TransformedStringTypeKind } from "./Type";
import { isDate, isTime, isDateTime } from "./DateTime";
export class StringTypes {
static readonly unrestricted: StringTypes = new StringTypes(undefined, new Set());
static fromCase(s: string, count: number): StringTypes {
const caseMap: { [name: string]: number } = {};
caseMap[s] = count;
return new StringTypes(new Map([[s, count] as [string, number]]), new Set());
}
static fromCases(cases: string[]): StringTypes {
const caseMap: { [name: string]: number } = {};
for (const s of cases) {
caseMap[s] = 1;
}
return new StringTypes(new Map(cases.map(s => [s, 1] as [string, number])), new Set());
}
// undefined means no restrictions
constructor(
readonly cases: ReadonlyMap<string, number> | undefined,
readonly transformations: ReadonlySet<TransformedStringTypeKind>
) {
if (cases === undefined) {
assert(transformations.size === 0, "We can't have an unrestricted string that also allows transformations");
}
}
get isRestricted(): boolean {
return this.cases !== undefined;
}
union(othersArray: StringTypes[], startIndex: number): StringTypes {
if (this.cases === undefined) return this;
const cases = new Map(this.cases);
const transformations = new Set(this.transformations);
for (let i = startIndex; i < othersArray.length; i++) {
const other = othersArray[i];
if (other.cases === undefined) return other;
mapMergeWithInto(cases, (x, y) => x + y, other.cases);
setUnionInto(transformations, other.transformations);
}
return new StringTypes(cases, transformations);
}
intersect(othersArray: StringTypes[], startIndex: number): StringTypes {
let cases = this.cases;
let transformations = this.transformations;
for (let i = startIndex; i < othersArray.length; i++) {
const other = othersArray[i];
if (cases === undefined) {
cases = definedMap(other.cases, m => new Map(m));
} else if (other.cases !== undefined) {
const thisCases = cases;
const otherCases = other.cases;
cases = mapMap(setIntersect(thisCases.keys(), new Set(otherCases.keys())).entries(), k =>
Math.min(defined(thisCases.get(k)), defined(otherCases.get(k)))
);
}
transformations = setIntersect(transformations, other.transformations);
}
return new StringTypes(cases, transformations);
}
applyStringTypeMapping(mapping: StringTypeMapping): StringTypes {
if (!this.isRestricted) return this;
const kinds = new Set<TransformedStringTypeKind>();
for (const kind of this.transformations) {
const mapped = stringTypeMappingGet(mapping, kind);
if (mapped === "string") return StringTypes.unrestricted;
kinds.add(mapped);
}
return new StringTypes(this.cases, new Set(kinds));
}
equals(other: any): boolean {
if (!(other instanceof StringTypes)) return false;
return areEqual(this.cases, other.cases) && areEqual(this.transformations, other.transformations);
}
hashCode(): number {
let h = hashCodeOf(this.cases);
h = addHashCode(h, hashCodeOf(this.transformations));
return h;
}
toString(): string {
const parts: string[] = [];
const enumCases = this.cases;
if (enumCases === undefined) {
parts.push("unrestricted");
} else {
const firstKey = iterableFirst(enumCases.keys());
if (firstKey === undefined) {
parts.push("enum with no cases");
} else {
parts.push(`${enumCases.size.toString()} enums: ${firstKey} (${enumCases.get(firstKey)}), ...`);
}
}
return parts.concat(Array.from(this.transformations)).join(",");
}
}
class StringTypesTypeAttributeKind extends TypeAttributeKind<StringTypes> {
constructor() {
super("stringTypes");
}
get inIdentity(): boolean {
return true;
}
requiresUniqueIdentity(st: StringTypes): boolean {
return st.cases !== undefined && st.cases.size > 0;
}
combine(arr: StringTypes[]): StringTypes {
assert(arr.length > 0);
return arr[0].union(arr, 1);
}
intersect(arr: StringTypes[]): StringTypes {
assert(arr.length > 0);
return arr[0].intersect(arr, 1);
}
makeInferred(_: StringTypes): undefined {
return undefined;
}
stringify(st: StringTypes): string {
return st.toString();
}
}
export const stringTypesTypeAttributeKind: TypeAttributeKind<StringTypes> = new StringTypesTypeAttributeKind();
const INTEGER_STRING = /^(0|-?[1-9]\d*)$/;
// We're restricting numbers to what's representable as 32 bit
// signed integers, to be on the safe side of most languages.
const MIN_INTEGER_STRING = 1 << 31;
const MAX_INTEGER_STRING = -(MIN_INTEGER_STRING + 1);
function isIntegerString(s: string): boolean {
if (s.match(INTEGER_STRING) === null) {
return false;
}
const i = parseInt(s, 10);
return i >= MIN_INTEGER_STRING && i <= MAX_INTEGER_STRING;
}
const UUID = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/;
function isUUID(s: string): boolean {
return s.match(UUID) !== null;
}
/**
* JSON inference calls this function to figure out whether a given string is to be
* transformed into a higher level type. Must return undefined if not, otherwise the
* type kind of the transformed string type.
*
* @param s The string for which to determine the transformed string type kind.
*/
export function inferTransformedStringTypeKindForString(s: string): TransformedStringTypeKind | undefined {
if (s.length === 0 || "0123456789-abcdeft".indexOf(s[0]) < 0) return undefined;
if (isDate(s)) {
return "date";
} else if (isTime(s)) {
return "time";
} else if (isDateTime(s)) {
return "date-time";
} else if (isIntegerString(s)) {
return "integer-string";
} else if (s === "false" || s === "true") {
return "bool-string";
} else if (isUUID(s)) {
return "uuid";
}
return undefined;
}