78 lines
2.7 KiB
TypeScript
78 lines
2.7 KiB
TypeScript
import { Value, is, Position } from '@preserves/core';
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import { ModulePath, Ref, Schema, Pattern, $thisModule, $definitions } from './gen/schema';
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import { BASE } from './base';
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import { SchemaSyntaxError } from './error';
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export * from './gen/schema';
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export type Input = Value<never>;
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export function isValidToken(s: string, allowLeadingUnderscore = false): boolean {
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if (allowLeadingUnderscore) {
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return /^[a-zA-Z_][a-zA-Z_0-9]*$/.test(s);
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} else {
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return /^[a-zA-Z][a-zA-Z_0-9]*$/.test(s);
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}
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}
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export const ANDSYM = Symbol.for('&');
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export const DOT = Symbol.for('.');
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export const DOTDOTDOT = Symbol.for('...');
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export const EQUALS = Symbol.for('=');
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export const ORSYM = Symbol.for('/');
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export type SchemaEnvEntry = { schemaModulePath: ModulePath } & (
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({
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typescriptModulePath: string | null, // null means it's $thisModule in disguise
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schema: Schema,
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}) | ({
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typescriptModulePath: string,
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schema: null,
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})
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);
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export type Environment = Array<SchemaEnvEntry>;
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function modsymFor(e: SchemaEnvEntry): string {
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return '_i_' + e.schemaModulePath.map(s => s.description!).join('$');
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}
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export function lookup<R>(namePos: Position | null,
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name: Ref,
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env: Environment,
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kLocal: (p: Pattern) => R,
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kBase: (p: Pattern) => R,
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kOther: (mod: string, modPath: string, p: Pattern | null) => R): R
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{
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for (const e of env) {
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if (is(e.schemaModulePath, Ref._.module(name)) ||
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(e.typescriptModulePath === null && Ref._.module(name) === $thisModule))
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{
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if (e.schema === null) {
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// It's an artificial module, not from a schema. Assume the identifier is present.
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return kOther(modsymFor(e), e.typescriptModulePath, null);
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} else {
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const p = Schema._.details(e.schema).get($definitions).get(Ref._.name(name));
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if (p !== void 0) {
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if (e.typescriptModulePath === null) {
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return kLocal(p);
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} else {
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return kOther(modsymFor(e), e.typescriptModulePath, p);
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}
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}
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}
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}
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}
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if (Ref._.module(name) === $thisModule) {
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const p = Schema._.details(BASE).get($definitions).get(Ref._.name(name));
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if (p !== void 0) return kBase(p);
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}
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throw new SchemaSyntaxError(`Undefined reference: ${formatRef(name)}`, namePos);
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}
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export function formatRef(r: Ref): string {
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return [... r[0] === $thisModule ? [] : r[0], r[1]].map(s => s.description!).join('.');
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}
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