Bumped version to 0.2.6

Makefile

@@ -2,7 +2,7 @@
 
 build/packages:
 	mkdir -p $@
-	node tools/stage-for-pnpn.mjs package-manifest.yaml source $@
+	node tools/stage-for-pnpm.mjs package-manifest.yaml source $@
 
 publish:
 	cd build/packages && ./publish-all.sh

documentation/data/readme.md

@@ -0,0 +1,9 @@
+# @efforting.tech/data
+
+Data processing modules.
+
+**TODO:** *Explain in more detail what this vague description actually refers to.*
+
+## field-configuration-factories.mjs
+
+Currently there are a few factories defined but we might add more as specific needs arises throughout the library.

experiments/config1.mjs

@@ -0,0 +1,50 @@
+import { Schema, Field_Configuration  } from '@efforting.tech/data/field-configuration';
+
+
+function mandatory_anything(value) {
+	return value !== undefined;
+}
+
+
+function string_coercion_function(value) {
+	if (value === undefined) {
+		throw new Error('Undefined not allowed');
+	}
+	return String(value);
+}
+
+
+
+const fc = new Field_Configuration(null, string_coercion_function, null, 'Anything that could be a string');
+const fd = new Field_Configuration(null, string_coercion_function, () => 'baz', 'A string. Defaults to \'baz\'');
+
+console.log(fc.check_validation(undefined));
+console.log(fc.check_validation(true));
+
+console.log([ fc.coerce(123) ]);
+console.log([ fc.coerce(true) ]);
+
+// console.log([ fc.load(undefined, 'Some configuration') ]);
+// console.log([ fc.load(true) ]);
+
+
+//fc.validate(undefined);
+//console.log(fc.load(undefined, 'New thingamabob object'));
+
+
+const s = new Schema({
+	foo: fc,
+	bar: fd,
+});
+
+const s2 = new Schema({
+	thing: fc,
+	stuff: s,
+});
+
+console.log(s2.load({
+	stuff: { foo: 'Hello World' },
+	thing: 123,
+}));
+
+// { thing: '123', stuff: { foo: 'Hello World', bar: 'baz' } }

experiments/config2.mjs

@@ -0,0 +1,9 @@
+import * as F from '@efforting.tech/data/field-configuration-factories';
+
+const s = new F.Schema({
+	foo: F.value(123, 'The value'),
+	bar: F.factory((t) => `Field ${t.field_name} was not set`, 'The factory'),
+});
+
+
+console.log(s.load()) // { foo: 123, bar: 'Field bar was not set' }

experiments/package.json

@@ -3,6 +3,7 @@
 	"type": "module",
 	"dependencies": {
 		"@efforting.tech/errors": "link:../build/packages/errors",
-		"@efforting.tech/rule-processing": "link:../build/packages/rule-processing"
+		"@efforting.tech/rule-processing": "link:../build/packages/rule-processing",
+		"@efforting.tech/data": "link:../build/packages/data"
 	}
 }

package-manifest.yaml

@@ -1,6 +1,6 @@
 scope: '@efforting.tech'
 registry: 'https://npm.efforting.tech/'
-version: 0.2.4
+version: 0.2.6
 
 author:
   name: 'Mikael Lövqvist'
@@ -21,6 +21,12 @@ packages:
     internal-dependencies:
       - errors
 
+  data:
+    path: source/data
+    #documentation: documentation/data
+    description: Data management
+    internal-dependencies:
+      - errors
 
 wip-packages:
   object-graph-storage:

package.json

@@ -0,0 +1,5 @@
+{
+	"dependencies": {
+		"experiments": "^0.3.0"
+	}
+}

source/data/field-configuration-factories.mjs

@@ -0,0 +1,28 @@
+import { Field_Configuration } from './field-configuration.mjs';
+export { Schema } from './field-configuration.mjs';
+
+//constructor(validation_function=null, coercion_function=null, factory_function=null, expected_description=undefined) {
+
+export function value(default_value, description) {
+	return new Field_Configuration(null, null, () => default_value, description);
+}
+
+export function factory(factory_function, description) {
+	return new Field_Configuration(null, null, factory_function, description);
+}
+
+export function typed_value(coercion_function, default_value, description) {
+	return new Field_Configuration(null, coercion_function, () => default_value, description);
+}
+
+export function typed_factory(coercion_function, factory_function, description) {
+	return new Field_Configuration(null, coercion_function, factory_function, description);
+}
+
+export function required(description) {
+	return new Field_Configuration((value) => value !== undefined, null, null, description);
+}
+
+export function typed_required(coercion_function, description) {
+	return new Field_Configuration((value) => value !== undefined, coercion_function, null, description);
+}

source/data/field-configuration.mjs

@@ -0,0 +1,82 @@
+import { Data_Validation_Failed, Data_Coercion_Failed, Superfluous_Data_Field } from '@efforting.tech/errors';
+
+
+export class Field_Configuration {
+	constructor(validation_function=null, coercion_function=null, factory_function=null, expected_description=undefined) {
+		Object.assign(this, { validation_function, coercion_function, factory_function, expected_description });
+	}
+
+	check_validation(value) {
+		const { validation_function } = this;
+		return !validation_function || validation_function(value);
+	}
+
+	validate(value, target=undefined) {
+		const { validation_function, expected_description } = this;
+		if (!this.check_validation(value)) {
+			throw new Data_Validation_Failed({
+				validation_function, value,
+				target, expected_description,
+			});
+		}
+	}
+
+	coerce(value, target=undefined) {
+		const { coercion_function, expected_description } = this;
+		try {
+			return coercion_function ? coercion_function(value) : value;
+		} catch (e) {
+			throw new Data_Coercion_Failed({
+				coercion_function, value,
+				target, expected_description,
+				upstream_error: e,
+			})
+		}
+	}
+
+	load(value=undefined, target=undefined) {
+
+		const { factory_function } = this;
+
+		if ((value === undefined) && factory_function) {
+			value = factory_function(target);
+		}
+
+		const coerced_value = this.coerce(value, target);
+		this.validate(coerced_value, target);
+		return coerced_value;
+	}
+
+
+}
+
+
+export class Schema {
+
+	constructor(field_schema, name=undefined) {
+		Object.assign(this, { field_schema, name });
+	}
+
+	load(value={}, target=undefined) {
+		const { field_schema, name } = this;
+
+		for (const [value_name, value_value] of Object.entries(value)) {
+			if (!field_schema[value_name]) {
+				throw new Superfluous_Data_Field({
+					field_value: value_value, field_name: value_name, target,
+				});
+			}
+		}
+
+		const result = {};
+		const this_schema = name ? `schema "${name}"` : 'untitled schema';
+
+		for (const [field_name, field_config] of Object.entries(field_schema)) {
+			const sub_target = { schema: this, name: field_name, config: field_config, parent_target: target, info: `Field "${field_name}" of ${this_schema}` };
+			result[field_name] = field_config.load(value[field_name], sub_target);
+		}
+
+		return result;
+	}
+
+}

source/errors.mjs

@@ -1,5 +1,49 @@
 import { inspect } from 'node:util';
 
+// § GROUP: Configuration field errors
+
+export class Data_Validation_Failed extends Error {
+	constructor(data) {
+		const { value, target, expected_description, validation_function, upstream_error } = data;
+		const type = value === null ? 'null' : typeof value;
+
+		const target_info = target?.info ? inspect(target.info) : 'unknown target';
+		const field_ref = target?.name ? `field "${target.name}"` : 'unknown field';
+
+		const expected_desc = expected_description ?? `data that would pass validation using ${validation_function}`;
+		const upstream_error_description = upstream_error ? ` Upstream error was: ${upstream_error}` : '';
+		super(`Data validation failed for ${field_ref} of ${target_info}. Encountered data of type "${type}" while expecting "${expected_desc}".${upstream_error_description}`);
+		this.data = data;
+	}
+}
+
+export class Superfluous_Data_Field extends Error {
+	constructor(data) {
+		const { field_value, field_name, target, upstream_error } = data;
+		const type = field_value === null ? 'null' : typeof field_value;
+
+		const target_info = target?.info ? inspect(target.info) : 'unknown target';
+
+		const upstream_error_description = upstream_error ? ` Upstream error was: ${upstream_error}` : '';
+		super(`Data validation failed for ${target_info}. Superfluous field "${field_name}" with value of type "${type}" encountered.${upstream_error_description}`);
+		this.data = data;
+	}
+}
+
+export class Data_Coercion_Failed extends Error {
+	constructor(data) {
+		const { value, target, expected_description, coercion_function, upstream_error } = data;
+		const type = value === null ? 'null' : typeof value;
+
+		const target_info = target?.info ? inspect(target.info) : 'unknown target';
+		const field_ref = target?.name ? `field "${target.name}"` : 'unknown field';
+
+		const expected_desc = expected_description ?? `data that would be coerced using ${coercion_function}`;
+		const upstream_error_description = upstream_error ? ` Upstream error was: ${upstream_error}` : '';
+		super(`Data coercion failed for ${field_ref} of ${target_info}. Encountered data of type "${type}" while expecting "${expected_desc}".${upstream_error_description}`);
+		this.data = data;
+	}
+}
 // § GROUP: Resolving errors
 
 export class Item_Unresolvable extends Error {

source/rule-processing/resolvers.mjs

@@ -30,6 +30,7 @@ export class Chained_Resolver extends Abstract_Resolver {
 
 export class Mapping_Resolver extends Abstract_Resolver {
 	constructor(rules=new Map(), key_function=null) {
+		super();
 		Object.assign(this, { rules, key_function });
 	}
 

tools/stage-for-pnpm.mjs

@@ -89,7 +89,7 @@ for (const [package_name, package_data] of Object.entries(manifest.packages)) {
 	const exports_map = {};
 	for (const file of linked_sources) {
 		const name = path.basename(file, '.mjs');
-		const key = name === pkg.name ? '.' : `./${name}`;
+		const key = name === path.basename(pkg.name) ? '.' : `./${name}`;
 		exports_map[key] =  `./${file}`;
 	}