Initial commit

Includes all X·S·D datatype productions and operators and initial setup
for X·S·D functions (but no functions yet).

diff --git a/LICENSE b/LICENSE
new file mode 100644 (file)
index 0000000..ee6256c
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,373 @@
+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

diff --git a/README.markdown b/README.markdown
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--- /dev/null
+++ b/README.markdown
@@ -0,0 +1,36 @@
+# ♓️🪡 सूत्र
+
+**X·D·M for Ecmascript.**
+
+♓️🪡 सूत्र is an implementation of the
+[X·Path and X·Query Data Model (X·D·M)][XDM] for Ecmascript. It
+includes an implementation of the
+[X·M·L Schema Definition Language][XSD-1] in the [`xsd`](./xsd)
+directory.
+
+This module depends heavily on [♓️🧩 Piscēs][Pisces].
+
+## Nomenclature
+
+<i lang="sa">सूत्र</i> (<i lang="sa-Latn">sūtra</i>) is a Sanskrit word
+meaning “thread”.
+
+In Ascii, ♓️🪡 सूत्र should be represented as `Sutra`, the Anglicized
+form of the name.
+
+## Current Status
+
+Prospective. The immediate goal is to have a working impelentation of
+the [X·M·L Schema Definition Datatypes][XSD-2]. Other components will
+be added later.
+
+## License
+
+Source files are licensed under the terms of the <cite>Mozilla Public
+License, version 2.0</cite>. For more information, see
+[LICENSE](./LICENSE).
+
+[Pisces]: <https://git.ladys.computer/Pisces>
+[XSD-1]: <https://www.w3.org/TR/xmlschema11-1/>
+[XSD-2]: <https://www.w3.org/TR/xmlschema11-2/>
+[XDM]: <https://www.w3.org/TR/xpath-datamodel/>

diff --git a/deno.json b/deno.json
new file mode 100644 (file)
index 0000000..d00db95
--- /dev/null
+++ b/deno.json
@@ -0,0 +1 @@
+{ "fmt": { "lineWidth": 71 } }

diff --git a/deno.lock b/deno.lock
new file mode 100644 (file)
index 0000000..7688268
--- /dev/null
+++ b/deno.lock
@@ -0,0 +1,19 @@
+{
+  "version": "2",
+  "remote": {
+    "https://deno.land/std@0.192.0/fmt/colors.ts": "d67e3cd9f472535241a8e410d33423980bec45047e343577554d3356e1f0ef4e",
+    "https://deno.land/std@0.192.0/testing/_diff.ts": "1a3c044aedf77647d6cac86b798c6417603361b66b54c53331b312caeb447aea",
+    "https://deno.land/std@0.192.0/testing/_format.ts": "a69126e8a469009adf4cf2a50af889aca364c349797e63174884a52ff75cf4c7",
+    "https://deno.land/std@0.192.0/testing/_test_suite.ts": "30f018feeb3835f12ab198d8a518f9089b1bcb2e8c838a8b615ab10d5005465c",
+    "https://deno.land/std@0.192.0/testing/asserts.ts": "e16d98b4d73ffc4ed498d717307a12500ae4f2cbe668f1a215632d19fcffc22f",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/binary.js": "4dd2ba7bc3c0d7b31b24fdd8350f3d976ae8c916b283cedc06dd3b768bbcb812",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/collection.js": "3d9f2f9817273aeffd6735ecf5cd2a00ed7a9327859fb026e729b434ab98c59b",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/function.js": "0ca111c31ff3694822082e785c52d71c079c0269f3fb3b97c0d145a4a4ca31d1",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/iri.js": "8dcb861befecff5897c489b73cc077453a857cda899844ebc6f5f3f3cd6c03f2",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/mod.js": "835746ed65fa23c87235343e88945ee5a6cbb5c7baa74f197ff5f9cd280dd506",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/numeric.js": "3c46c43c6d15d91d54363320e19f3cb32beaf9779419bd05b8988a030bd68410",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/object.js": "e611a5aad46ca1525cd6a9e55eb00fee4c62012464b087bd04f38754a6eded84",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/string.js": "64e6e2ed922b927db720b38cb1c4f781617fbd15fcf0bf285a90c12ff5619a62",
+    "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/value.js": "96d2e2c347ea76f191b78a622e8bf04ac31213184f72a5d1247aa4c381304d88"
+  }
+}

diff --git a/deps.js b/deps.js
new file mode 100644 (file)
index 0000000..471ec38
--- /dev/null
+++ b/deps.js
@@ -0,0 +1,33 @@
+// ♓️🪡 सूत्र ∷ deps.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+export {
+  bind,
+  call,
+  floor,
+  getPrototype,
+  isArrayBuffer,
+  isFiniteNumber,
+  isIntegralNumber,
+  ITERATOR,
+  Matcher,
+  NAN,
+  NEGATIVE_INFINITY,
+  NEGATIVE_ZERO,
+  objectCreate,
+  POSITIVE_INFINITY,
+  POSITIVE_ZERO,
+  rawString,
+  sameValue,
+  stringSplit,
+  substring,
+  toFloat32,
+  type,
+  UNDEFINED,
+} from "https://git.ladys.computer/Pisces/blob_plain/0.4.0:/mod.js";

diff --git a/dev-deps.js b/dev-deps.js
new file mode 100644 (file)
index 0000000..3b374d6
--- /dev/null
+++ b/dev-deps.js
@@ -0,0 +1,13 @@
+// ♓️🪡 सूत् ∷ dev-deps.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+export {
+  assert,
+  assertStrictEquals,
+} from "https://deno.land/std@0.192.0/testing/asserts.ts";

diff --git a/xsd/README.markdown b/xsd/README.markdown
new file mode 100644 (file)
index 0000000..0ed60ea
--- /dev/null
+++ b/xsd/README.markdown
@@ -0,0 +1,73 @@
+# ♓️🪡 सूत्र ∷ X·S·D
+
+♓️🪡 सूत्र ∷ X·S·D provides an implementation of the
+[X·M·L Schema Definition Language][XSD-1], including the
+[X·M·L Schema Definition Datatypes][XSD-2], for Ecmascript.
+
+## Notes
+
+### Typechecking
+
+All of the functions provided by `./functions.js` will throw an error
+if they are given arguments which do not match the expectations
+established by the X·S·D spec. No type coersion occurs.
+
+### Efficiency
+
+♓️🪡 सूत्र ∷ X·S·D emphasizes algorithm correctness and takes a somewhat
+extreme stance with regards to spec adherence. This means that the
+algorithms used may be somewhat slow, although native platform features
+will be leveraged when possible.
+
+### Numeric values
+
+♓️🪡 सूत्र ∷ X·S·D treats all numeric values as native Ecmascript
+numbers. This may lead to rounding errors for decimals and extreme
+values.
+
+This behaviour may change in the future; see
+<https://github.com/tc39/proposal-decimal> for progress on getting a
+more precise decimal type into Ecmascript.
+
+### Positive and Negative Zero
+
+X·S·D only formally distinguishes positive and negative zero for floats
+and doubles, but it allows them to be represented lexically in all
+other signed numeric types. ♓️🪡 सूत्र ∷ X·S·D silently coerces negative
+zero to positive zero for numeric datatypes in which it is not an
+explicit part of the value space, as well as for numeric components of
+other datatypes (e·g durations).
+
+### Date∕times and Durations
+
+♓️🪡 सूत्र ∷ X·S·D does not provide actual classes for X·S·D
+date/timeSevenPropertyModel values or durations, treatings both as
+simple objects. This approach was taken to maximize compatibility with
+other modules. Formally :—
+
+1. A duration is any object for which getting the `months` property
+   returns an integer, getting the `seconds` property returns a finite
+   number, and these two values have the same sign. (Positive and
+   negative zero are treated as having the same sign for this
+   comparison.)
+
+   Note that `months` and `seconds` **must not** be undefined.
+
+2. A date/timeSevenPropertyModel value is any object for which getting
+   the `year`, `month`, `day`, `hour`, `minute`, `second`, and
+   `timezoneOffset` properties returns values within the bounds
+   specified in the X·S·D specification. Absent values can be
+   represented with undefined, and need not actually be defined on the
+   object).
+
+Functions which return durations or date/timeSevenPropertyModel values
+will always return a plain, extensible object which :—
+
+- Inherits from `%ObjectPrototype%`,
+- Has all of the applicable properties defined as enumerable,
+  configurable, writable own data properties (absent properties will be
+  defined with a value of undefined), and
+- Has no other own properties.
+
+[XSD-1]: <https://www.w3.org/TR/xmlschema11-1/>
+[XSD-2]: <https://www.w3.org/TR/xmlschema11-2/>

diff --git a/xsd/functions.js b/xsd/functions.js
new file mode 100644 (file)
index 0000000..4ad5b5c
--- /dev/null
+++ b/xsd/functions.js
@@ -0,0 +1,440 @@
+// ♓️🪡 सूत्र ∷ xsd/functions.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+import {
+  bind,
+  call,
+  getPrototype,
+  isArrayBuffer,
+  isFiniteNumber,
+  isIntegralNumber,
+  ITERATOR,
+  objectCreate,
+  sameValue,
+  toFloat32,
+  type,
+} from "../deps.js";
+import { div, mod } from "./operators.js";
+import {
+  booleanRep,
+  dateLexicalRep,
+  dateTimeLexicalRep,
+  dayFrag,
+  dayTimeDurationLexicalRep,
+  decimalLexicalRep,
+  decimalPtNumeral,
+  digit as lexicalDigit,
+  doubleRep,
+  duDayFrag,
+  duDayTimeFrag,
+  duHourFrag,
+  duMinuteFrag,
+  duMonthFrag,
+  durationLexicalRep,
+  duSecondFrag,
+  duTimeFrag,
+  duYearFrag,
+  duYearMonthFrag,
+  floatRep,
+  fracFrag,
+  gDayLexicalRep,
+  gMonthDayLexicalRep,
+  gMonthLexicalRep,
+  gYearLexicalRep,
+  gYearMonthLexicalRep,
+  hexBinary,
+  hexDigit,
+  hexOctet,
+  hourFrag,
+  minuteFrag,
+  monthFrag,
+  noDecimalPtNumeral,
+  numericalSpecialRep,
+  scientificNotationNumeral,
+  secondFrag,
+  stringRep,
+  timeLexicalRep,
+  timezoneFrag,
+  unsignedDecimalPtNumeral,
+  unsignedNoDecimalPtNumeral,
+  yearFrag,
+  yearMonthDurationLexicalRep,
+} from "./productions.js";
+import {
+  absent,
+  negativeInfinity,
+  negativeZero,
+  notANumber,
+  positiveInfinity,
+  positiveZero,
+} from "./values.js";
+
+const stringToFloat = parseFloat;
+
+/**
+ * Ensures that the provided matcher matches the provided value and
+ * returns it.
+ *
+ * ☡ This function throws if the matcher does not match.
+ *
+ * ※ This function is not exposed.
+ */
+const ensureMatches = (matcher, $) => {
+  if (matcher($)) {
+    return $;
+  } else {
+    throw new TypeError(
+      `सूत्र: Expected a ${matcher.name}, but got: ${$}.`,
+    );
+  }
+};
+
+/**
+ * Ensures that the provided value with the provided name is present or
+ * absent.
+ *
+ * ☡ This function throws if the presence of the value is not correct.
+ *
+ * ※ This function is not exposed.
+ */
+const ensurePresence = (name, value, present = true) => {
+  if ((value !== absent) === !present) {
+    throw new TypeError(
+      `सूत्र: Expected ${name} to be ${
+        present ? "present" : "absent"
+      }, but got: ${value}.`,
+    );
+  } else {
+    return value;
+  }
+};
+
+/**
+ * Ensures that the provided value is a valid, complete duration and
+ * returns an object with its months and seconds.
+ *
+ * ☡ This function throws if the provided value is not a valid,
+ * complete duration.
+ *
+ * ※ This function is not exposed.
+ */
+const duration = ($) => {
+  const { months, seconds } = $;
+  if (!isIntegralNumber(months)) {
+    throw new TypeError(
+      `सूत्र: Expected duration to have an integer for months, but got: ${months}.`,
+    );
+  } else if (!isFiniteNumber(seconds)) {
+    throw new TypeError(
+      `सूत्र: Expected duration to have a finite number for seconds, but got: ${seconds}.`,
+    );
+  } else if (months > 0 && seconds < 0 || months < 0 && seconds > 0) {
+    throw new TypeError(
+      `सूत्र: Expected seconds in duration to match polarity of months, but got: ${seconds}.`,
+    );
+  } else {
+    return { months, seconds };
+  }
+};
+
+/**
+ * Ensures that the provided value is a valid
+ * date/timeSevenPropertyModel value and returns an object with its
+ * year, month, day, hour, minute, second, and timezoneOffset.
+ *
+ * ☡ This function throws if the provided value is not a valid
+ * date/timeSevenPropertyModel value.
+ *
+ * ※ This function is not exposed.
+ */
+const date·timeSevenPropertyModel = ($) => {
+  if (type($) !== "object") {
+    throw new TypeError(
+      `सूत्र: Expected a date/timeSevenPropertyModel value, but got: ${$}.`,
+    );
+  } else {
+    const { year, month, day, hour, minute, second, timezoneOffset } =
+      $;
+    if (year !== absent && !isIntegralNumber(year)) {
+      throw new TypeError(
+        `सूत्र: Expected year to be an optional integer, but got: ${year}.`,
+      );
+    } else if (
+      month !== absent &&
+      !(isIntegralNumber(month) && month >= 1 && month <= 12)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected month to be an optional integer between 1 and 12 inclusive, but got: ${month}.`,
+      );
+    } else if (
+      day !== absent &&
+      !(isIntegralNumber(day) && day >= 1 && day <= 31)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected day to be an optional integer between 1 and 31 inclusive, but got: ${day}.`,
+      );
+    } else if (
+      hour !== absent &&
+      !(isIntegralNumber(hour) && hour >= 0 && hour <= 24)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected hour to be an optional integer between 0 and 24 inclusive, but got: ${hour}.`,
+      );
+    } else if (
+      minute !== absent &&
+      !(isIntegralNumber(minute) && minute >= 0 && minute <= 59)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected minute to be an optional integer between 0 and 59 inclusive, but got: ${minute}.`,
+      );
+    } else if (
+      second !== absent &&
+      !(isFiniteNumber(second) && second >= 0 && second < 60)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected second to be an optional finite number greater than or equal to 0 and less than 60, but got: ${second}.`,
+      );
+    } else if (
+      timezoneOffset !== absent &&
+      !(isIntegralNumber(timezoneOffset) && timezoneOffset >= -840 &&
+        timezoneOffset <= 840)
+    ) {
+      throw new TypeError(
+        `सूत्र: Expected timezoneOffset to be an optional integer between -840 and 840 inclusive, but got: ${timezoneOffset}.`,
+      );
+    } else if (
+      month !== absent && day !== absent && !(
+        month === 2 && day === 29
+      ) && day > daysInMonth(year, month)
+    ) {
+      throw new TypeError(
+        `सूत्र: The provided day violates the day‐of‐month constraint for month ${month}: ${day}.`,
+      );
+    } else {
+      return {
+        year,
+        month,
+        day,
+        hour,
+        minute,
+        second,
+        timezoneOffset,
+      };
+    }
+  }
+};
+
+/**
+ * Ensures that the provided value is an integer and returns it.
+ *
+ * ☡ This function throws if the provided value is not an integer.
+ *
+ * ※ This function is not exposed.
+ */
+const integer = ($) => {
+  if (!isIntegralNumber($)) {
+    throw new TypeError(`सूत्र: Expected an integer, but got: ${$}.`);
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a nonnegative integer and returns
+ * it.
+ *
+ * ☡ This function throws if the provided value is not a nonnegative
+ * integer.
+ *
+ * ※ This function is not exposed.
+ */
+const nonnegativeInteger = ($) => {
+  if (!(isIntegralNumber($) && $ >= 0)) {
+    throw new TypeError(
+      `सूत्र: Expected a nonnegative integer, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a finite number and returns it.
+ *
+ * ☡ This function throws if the provided value is not a finite number.
+ *
+ * ※ This function is not exposed.
+ */
+const decimalNumber = ($) => {
+  if (!(isFiniteNumber($))) {
+    throw new TypeError(
+      `सूत्र: Expected a finite number, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a nonnegative finite number and
+ * returns it.
+ *
+ * ☡ This function throws if the provided value is not a nonnegative
+ * finite number.
+ *
+ * ※ This function is not exposed.
+ */
+const nonnegativeDecimalNumber = ($) => {
+  if (!(isFiniteNumber($) && $ >= 0)) {
+    throw new TypeError(
+      `सूत्र: Expected a nonnegative finite number, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a 32‐bit float and returns it.
+ *
+ * ☡ This function throws if the provided value is not a 32‐bit float.
+ *
+ * ※ This function is not exposed.
+ */
+const float = ($) => {
+  if (typeof $ !== "number" || !sameValue(toFloat32($), $)) {
+    throw new TypeError(
+      `सूत्र: Expected a float value, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a number and returns it.
+ *
+ * ☡ This function throws if the provided value is not a number.
+ *
+ * ※ This function is not exposed.
+ */
+const double = ($) => {
+  if (typeof $ !== "number") {
+    throw new TypeError(
+      `सूत्र: Expected a double value, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+/**
+ * Ensures that the provided value is a hexBinary value, i·e a sequence
+ * of binary octets.
+ *
+ * ☡ This function throws if the provided value is not an array buffer.
+ *
+ * ※ This function is not exposed.
+ */
+const hexBinaryValue = ($) => {
+  if (!isArrayBuffer($)) {
+    throw new TypeError(
+      `सूत्र: Expected a hexBinary value, but got: ${$}.`,
+    );
+  } else {
+    return $;
+  }
+};
+
+const {
+  /**
+   * Converts a string of 0’s and 1’s into a sequence of binary digits.
+   *
+   * ※ This function is not exposed.
+   */
+  binaryDigitSequence,
+
+  /**
+   * Converts a generator iterator into a sequence of values.
+   *
+   * ※ This function is not exposed.
+   */
+  generatorSequence,
+
+  /**
+   * Converts a string into a sequence of characters.
+   *
+   * ※ This function is not exposed.
+   */
+  literalSequence,
+} = (() => {
+  const {
+    next: generatorIteratorNext,
+  } = getPrototype(function* () {}.prototype);
+  const { [ITERATOR]: stringIterator } = String.prototype;
+  const {
+    next: stringIteratorNext,
+  } = getPrototype(""[ITERATOR]());
+  const binaryDigitIterator = function* () {
+    for (const digit of literalSequence(this)) {
+      yield digit === "0" ? 0 : 1;
+    }
+  };
+  const binaryDigitSequenceIterablePrototype = {
+    [ITERATOR]() {
+      return {
+        next: bind(
+          generatorIteratorNext,
+          call(binaryDigitIterator, this.binaryDigits, []),
+          [],
+        ),
+      };
+    },
+  };
+  const generatorSequenceIterablePrototype = {
+    [ITERATOR]() {
+      return {
+        next: bind(
+          generatorIteratorNext,
+          this.generator(),
+          [],
+        ),
+      };
+    },
+  };
+  const literalSequenceIterablePrototype = {
+    [ITERATOR]() {
+      return {
+        next: bind(
+          stringIteratorNext,
+          call(stringIterator, this.literal, []),
+          [],
+        ),
+      };
+    },
+  };
+
+  return {
+    binaryDigitSequence: (digits) =>
+      objectCreate(
+        binaryDigitSequenceIterablePrototype,
+        { binaryDigits: { value: digits } },
+      ),
+    generatorSequence: (generator) =>
+      objectCreate(
+        generatorSequenceIterablePrototype,
+        { generator: { value: generator } },
+      ),
+    literalSequence: (literal) =>
+      objectCreate(
+        literalSequenceIterablePrototype,
+        { literal: { value: literal } },
+      ),
+  };
+})();

diff --git a/xsd/mod.js b/xsd/mod.js
new file mode 100644 (file)
index 0000000..6c69de3
--- /dev/null
+++ b/xsd/mod.js
@@ -0,0 +1,13 @@
+// ♓️🪡 सूत्र ∷ xsd/mod.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+export * from "./functions.js";
+export * from "./operators.js";
+export * from "./productions.js";
+export * from "./values.js";

diff --git a/xsd/operators.js b/xsd/operators.js
new file mode 100644 (file)
index 0000000..0ef157c
--- /dev/null
+++ b/xsd/operators.js
@@ -0,0 +1,28 @@
+// ♓️🪡 सूत्र ∷ xsd/operators.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+import { floor } from "../deps.js";
+
+/**
+ * For the provided arguments m & n, the greatest integer less than or
+ * equal to m ∕ n.
+ *
+ * See <https://www.w3.org/TR/xmlschema11-2/#dt-div>.
+ */
+export const div = (m, n) => floor(m / n);
+
+/**
+ * For the provided arguments m & n, m − n × (m ·div· n).
+ *
+ * See <https://www.w3.org/TR/xmlschema11-2/#dt-mod>.
+ *
+ * ☡ This function may suffer from floating‐point rounding errors if
+ * the provided arguments are not integers.
+ */
+export const mod = (m, n) => m - n * div(m, n);

diff --git a/xsd/productions.js b/xsd/productions.js
new file mode 100644 (file)
index 0000000..86a8e2f
--- /dev/null
+++ b/xsd/productions.js
@@ -0,0 +1,485 @@
+// ♓️🪡 सूत्र ∷ xsd/productions.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+import {
+  Matcher,
+  objectCreate,
+  rawString,
+  stringSplit,
+  substring,
+} from "../deps.js";
+
+const dayOfMonthValuesConstraint = (day, month, year = "1972") => {
+  const d = +day;
+  const m = +month;
+  const y = +year;
+  return m === 4 || m === 6 || m === 9 || m === 11
+    ? d <= 30
+    : m === 2 && (y % 4 || !(y % 100) && y % 400)
+    ? d <= 28
+    : m === 2 && (!(y % 400) || !(y % 4) && y % 100)
+    ? d <= 29
+    : true;
+};
+
+export const {
+  /** `[1]   stringRep ::= Char*` */
+  stringRep,
+
+  /** `[2]   booleanRep ::= 'true' | 'false' | '1' | '0'` */
+  booleanRep,
+
+  /** `[3]   decimalLexicalRep ::= decimalPtNumeral | noDecimalPtNumeral` */
+  decimalLexicalRep,
+
+  /** `[4]   floatRep ::= noDecimalPtNumeral | decimalPtNumeral | scientificNotationNumeral | numericalSpecialRep` */
+  floatRep,
+
+  /** `[5]   doubleRep ::= noDecimalPtNumeral | decimalPtNumeral | scientificNotationNumeral | numericalSpecialRep` */
+  doubleRep,
+
+  /** `[6]   duYearFrag ::= unsignedNoDecimalPtNumeral 'Y'` */
+  duYearFrag,
+
+  /** `[7]   duMonthFrag ::= unsignedNoDecimalPtNumeral 'M'` */
+  duMonthFrag,
+
+  /** `[8]   duDayFrag ::= unsignedNoDecimalPtNumeral 'D'` */
+  duDayFrag,
+
+  /** `[9]   duHourFrag ::= unsignedNoDecimalPtNumeral 'H'` */
+  duHourFrag,
+
+  /** `[10]   duMinuteFrag ::= unsignedNoDecimalPtNumeral 'M'` */
+  duMinuteFrag,
+
+  /**
+   * `[11]   duSecondFrag ::= (unsignedNoDecimalPtNumeral | unsignedFullDecimalPtNumeral) 'S'`
+   *
+   * ※ The X·S·D specification specifies unsignedDecimalPtNumeral, not
+   * unsignedFullDecimalPtNumeral, but the specification text and
+   * provided regular expressions imply that the latter was intended.
+   */
+  duSecondFrag,
+
+  /** `[12]   duYearMonthFrag ::= (duYearFrag duMonthFrag?) | duMonthFrag` */
+  duYearMonthFrag,
+
+  /** `[13]   duTimeFrag ::= 'T' ((duHourFrag duMinuteFrag? duSecondFrag?) | (duMinuteFrag duSecondFrag?) | duSecondFrag)` */
+  duTimeFrag,
+
+  /** `[14]   duDayTimeFrag ::= (duDayFrag duTimeFrag?) | duTimeFrag` */
+  duDayTimeFrag,
+
+  /** `[15]   durationLexicalRep ::= '-'? 'P' ((duYearMonthFrag duDayTimeFrag?) | duDayTimeFrag)` */
+  durationLexicalRep,
+
+  /**
+   * `[16]   dateTimeLexicalRep ::= yearFrag '-' monthFrag '-' dayFrag 'T' ((hourFrag ':' minuteFrag ':' secondFrag) | endOfDayFrag) timezoneFrag?`
+   *
+   * **Constraint: Day-of-month Values**
+   *
+   * The ·day· value must be no more than 30 if ·month· is one of 4, 6,
+   * 9, or 11; no more than 28 if ·month· is 2 and ·year· is not
+   * divisible by 4, or is divisible by 100 but not by 400; and no more
+   * than 29 if ·month· is 2 and ·year· is divisible by 400, or by 4
+   * but not by 100.
+   *
+   * **Constraint: Day-of-month Representations**
+   *
+   * Within a dateTimeLexicalRep, a dayFrag must not begin with the
+   * digit '3' or be '29' unless the value to which it would map would
+   * satisfy the value constraint on ·day· values ("Constraint:
+   * Day-of-month Values") given above.
+   */
+  dateTimeLexicalRep,
+
+  /** `[17]   timeLexicalRep ::= ((hourFrag ':' minuteFrag ':' secondFrag) | endOfDayFrag) timezoneFrag?` */
+  timeLexicalRep,
+
+  /**
+   * `[18]   dateLexicalRep ::= yearFrag '-' monthFrag '-' dayFrag timezoneFrag?`
+   *
+   * **Constraint: Day-of-month Values**
+   *
+   * The ·day· value must be no more than 30 if ·month· is one of 4, 6,
+   * 9, or 11; no more than 28 if ·month· is 2 and ·year· is not
+   * divisible by 4, or is divisible by 100 but not by 400; and no more
+   * than 29 if ·month· is 2 and ·year· is divisible by 400, or by 4
+   * but not by 100.
+   *
+   * **Constraint: Day-of-month Representations**
+   *
+   * Within a dateLexicalRep, a dayFrag must not begin with the digit
+   * '3' or be '29' unless the value to which it would map would
+   * satisfy the value constraint on ·day· values ("Constraint:
+   * Day-of-month Values") given above.
+   */
+  dateLexicalRep,
+
+  /** `[19]   gYearMonthLexicalRep ::= yearFrag '-' monthFrag timezoneFrag?` */
+  gYearMonthLexicalRep,
+
+  /** `[20]   gYearLexicalRep ::= yearFrag timezoneFrag?` */
+  gYearLexicalRep,
+
+  /**
+   * `[21]   gMonthDayLexicalRep ::= '--' monthFrag '-' dayFrag timezoneFrag?`
+   *
+   * **Constraint: Day-of-month Values**
+   *
+   * The ·day· value must be no more than 30 if ·month· is one of 4, 6,
+   * 9, or 11, and no more than 29 if ·month· is 2.
+   *
+   * **Constraint: Day-of-month Representations**
+   *
+   * Within a gMonthDayLexicalRep, a dayFrag must not begin with the
+   * digit '3' or be '29' unless the value to which it would map would
+   * satisfy the value constraint on ·day· values ("Constraint:
+   * Day-of-month Values") given above.
+   */
+  gMonthDayLexicalRep,
+
+  /** `[22]   gDayLexicalRep ::= '---' dayFrag timezoneFrag?` */
+  gDayLexicalRep,
+
+  /** `[23]   gMonthLexicalRep ::= '--' monthFrag timezoneFrag?` */
+  gMonthLexicalRep,
+
+  /** `[24]   hexDigit ::= [0-9a-fA-F]` */
+  hexDigit,
+
+  /** `[25]   hexOctet ::= hexDigit hexDigit` */
+  hexOctet,
+
+  /** `[26]   hexBinary ::= hexOctet*` */
+  hexBinary,
+
+  /** `[27]   Base64Binary ::= (B64quad* B64final)?` */
+  Base64Binary,
+
+  /** `[28]   B64quad ::= (B64 B64 B64 B64)` */
+  B64quad,
+
+  /** `[29]   B64final ::= B64finalquad | Padded16 | Padded8` */
+  B64final,
+
+  /** `[30]   B64finalquad ::= (B64 B64 B64 B64char)` */
+  B64finalquad,
+
+  /** `[31]   Padded16 ::= B64 B64 B16 '='` */
+  Padded16,
+
+  /** `[32]   Padded8 ::= B64 B04 '=' #x20? '='` */
+  Padded8,
+
+  /** `[33]   B64 ::= B64char #x20?` */
+  B64,
+
+  /** `[34]   B64char ::= [A-Za-z0-9+/]` */
+  B64char,
+
+  /** `[35]   B16 ::= B16char #x20?` */
+  B16,
+
+  /** `[36]   B16char ::= [AEIMQUYcgkosw048]` */
+  B16char,
+
+  /** `[37]   B04 ::= B04char #x20?` */
+  B04,
+
+  /** `[38]   B04char ::= [AQgw]` */
+  B04char,
+
+  /** `[39]   Canonical-base64Binary ::= CanonicalQuad* CanonicalPadded?` */
+  Canonical·base64Binary,
+
+  /** `[40]   CanonicalQuad ::= B64char B64char B64char B64char` */
+  CanonicalQuad,
+
+  /** `[41]   CanonicalPadded ::= B64char B64char B16char '=' | B64char B04char '=='` */
+  CanonicalPadded,
+
+  /** `[42]   yearMonthDurationLexicalRep ::= '-'? 'P' duYearMonthFrag` */
+  yearMonthDurationLexicalRep,
+
+  /** `[43]   dayTimeDurationLexicalRep ::= '-'? 'P' duDayTimeFrag` */
+  dayTimeDurationLexicalRep,
+
+  /**
+   * `[44]   dateTimeStampLexicalRep ::= yearFrag '-' monthFrag '-' dayFrag 'T' ((hourFrag ':' minuteFrag ':' secondFrag) | endOfDayFrag) timezoneFrag`
+   *
+   * **Constraint: Day-of-month Values**
+   *
+   * The ·day· value must be no more than 30 if ·month· is one of 4, 6,
+   * 9, or 11; no more than 28 if ·month· is 2 and ·year· is not
+   * divisible by 4, or is divisible by 100 but not by 400; and no more
+   * than 29 if ·month· is 2 and ·year· is divisible by 400, or by 4
+   * but not by 100.
+   *
+   * **Constraint: Day-of-month Representations**
+   *
+   * Within a dateTimeStampLexicalRep, a dayFrag must not begin with
+   * the digit '3' or be '29' unless the value to which it would map
+   * would satisfy the value constraint on ·day· values ("Constraint:
+   * Day-of-month Values") given above.
+   */
+  dateTimeStampLexicalRep,
+
+  /** `[45]   digit ::= [0-9]` */
+  digit,
+
+  /** `[46]   unsignedNoDecimalPtNumeral ::= digit+` */
+  unsignedNoDecimalPtNumeral,
+
+  /** `[47]   noDecimalPtNumeral ::= ('+' | '-')? unsignedNoDecimalPtNumeral` */
+  noDecimalPtNumeral,
+
+  /** `[48]   fracFrag ::= digit+` */
+  fracFrag,
+
+  /** `[49]   unsignedDecimalPtNumeral ::= (unsignedNoDecimalPtNumeral '.' fracFrag?) | ('.' fracFrag)` */
+  unsignedDecimalPtNumeral,
+
+  /** `[50]   unsignedFullDecimalPtNumeral ::= unsignedNoDecimalPtNumeral '.' fracFrag` */
+  unsignedFullDecimalPtNumeral,
+
+  /** `[51]   decimalPtNumeral ::= ('+' | '-')? unsignedDecimalPtNumeral` */
+  decimalPtNumeral,
+
+  /** `[52]   unsignedScientificNotationNumeral ::= (unsignedNoDecimalPtNumeral | unsignedDecimalPtNumeral) ('e' | 'E') noDecimalPtNumeral` */
+  unsignedScientificNotationNumeral,
+
+  /** `[53]   scientificNotationNumeral ::= ('+' | '-')? unsignedScientificNotationNumeral` */
+  scientificNotationNumeral,
+
+  /** `[54]   minimalNumericalSpecialRep ::= 'INF' | '-INF' | 'NaN'` */
+  minimalNumericalSpecialRep,
+
+  /** `[55]   numericalSpecialRep ::= ('+' | '-')? unsignedScientificNotationNumeral` */
+  numericalSpecialRep,
+
+  /** `[56]   yearFrag ::= '-'? (([1-9] digit digit digit+)) | ('0' digit digit digit))` */
+  yearFrag,
+
+  /** `[57]   monthFrag ::= ('0' [1-9]) | ('1' [0-2])` */
+  monthFrag,
+
+  /** `[58]   dayFrag ::= ('0' [1-9]) | ([12] digit) | ('3' [01])` */
+  dayFrag,
+
+  /** `[59]   hourFrag ::= ([01] digit) | ('2' [0-3])` */
+  hourFrag,
+
+  /** `[60]   minuteFrag ::= [0-5] digit` */
+  minuteFrag,
+
+  /** `[61]   secondFrag ::= ([0-5] digit) ('.' digit+)?` */
+  secondFrag,
+
+  /** `[62]   endOfDayFrag ::= '24:00:00' ('.' '0'+)?` */
+  endOfDayFrag,
+
+  /** `[63]   timezoneFrag ::= 'Z' | ('+' | '-') (('0' digit | '1' [0-3]) ':' minuteFrag | '14:00')` */
+  timezoneFrag,
+} = (() => {
+  const matchers = objectCreate(null);
+  const match =
+    (name, constraint = null) => (strings, ...substitutions) => {
+      const source = `(?:${rawString(strings, ...substitutions)})`;
+      matchers[name] = new Matcher(`^${source}$`, name, constraint);
+      return source;
+    };
+
+  const stringRep = match(
+    "stringRep",
+  )`[^\u{0}\u{D800}-\u{DFFF}\u{FFFE}\u{FFFF}]*`;
+  const booleanRep = match("booleanRep")`true|false|1|0`;
+  const digit = match("digit")`[0-9]`;
+  const unsignedNoDecimalPtNumeral = match(
+    "unsignedNoDecimalPtNumeral",
+  )`${digit}+`;
+  const noDecimalPtNumeral = match(
+    "noDecimalPtNumeral",
+  )`[+-]?${unsignedNoDecimalPtNumeral}`;
+  const fracFrag = match("fracFrag")`${digit}+`;
+  const unsignedDecimalPtNumeral = match(
+    "unsignedDecimalPtNumeral",
+  )`${unsignedNoDecimalPtNumeral}\.${fracFrag}?|\.${fracFrag}`;
+  const unsignedFullDecimalPtNumeral = match(
+    "unsignedFullDecimalPtNumeral",
+  )`${unsignedNoDecimalPtNumeral}\.${fracFrag}`;
+  const decimalPtNumeral = match(
+    "decimalPtNumeral",
+  )`[+-]?${unsignedDecimalPtNumeral}`;
+  const unsignedScientificNotationNumeral = match(
+    "unsignedScientificNotationNumeral",
+  )`(?:${unsignedNoDecimalPtNumeral}|${unsignedDecimalPtNumeral})[eE]${noDecimalPtNumeral}`;
+  const scientificNotationNumeral = match(
+    "scientificNotationNumeral",
+  )`[+-]?${unsignedScientificNotationNumeral}`;
+  const minimalNumericalSpecialRep = match(
+    "minimalNumericalSpecialRep",
+  )`INF|-INF|NaN`;
+  const numericalSpecialRep = match(
+    "numericalSpecialRep",
+  )`\+INF|${minimalNumericalSpecialRep}`;
+  const decimalLexicalRep = match(
+    "decimalLexicalRep",
+  )`${decimalPtNumeral}|${noDecimalPtNumeral}`;
+  const floatRep = match(
+    "floatRep",
+  )`${noDecimalPtNumeral}|${decimalPtNumeral}|${scientificNotationNumeral}|${numericalSpecialRep}`;
+  const doubleRep = match(
+    "doubleRep",
+  )`${noDecimalPtNumeral}|${decimalPtNumeral}|${scientificNotationNumeral}|${numericalSpecialRep}`;
+  const duYearFrag = match(
+    "duYearFrag",
+  )`${unsignedNoDecimalPtNumeral}Y`;
+  const duMonthFrag = match(
+    "duMonthFrag",
+  )`${unsignedNoDecimalPtNumeral}M`;
+  const duDayFrag = match("duDayFrag")`${unsignedNoDecimalPtNumeral}D`;
+  const duHourFrag = match(
+    "duHourFrag",
+  )`${unsignedNoDecimalPtNumeral}H`;
+  const duMinuteFrag = match(
+    "duMinuteFrag",
+  )`${unsignedNoDecimalPtNumeral}M`;
+  const duSecondFrag = match(
+    "duSecondFrag",
+  )`(?:${unsignedNoDecimalPtNumeral}|${unsignedFullDecimalPtNumeral})S`;
+  const duYearMonthFrag = match(
+    "duYearMonthFrag",
+  )`${duYearFrag}${duMonthFrag}?|${duMonthFrag}`;
+  const duTimeFrag = match(
+    "duTimeFrag",
+  )`T(?:${duHourFrag}${duMinuteFrag}?${duSecondFrag}?|${duMinuteFrag}${duSecondFrag}?|${duSecondFrag})`;
+  const duDayTimeFrag = match(
+    "duDayTimeFrag",
+  )`${duDayFrag}${duTimeFrag}?|${duTimeFrag}`;
+  const durationLexicalRep = match(
+    "durationLexicalRep",
+  )`-?P(?:${duYearMonthFrag}${duDayTimeFrag}?|${duDayTimeFrag})`;
+  const yearFrag = match(
+    "yearFrag",
+  )`-?(?:[1-9]${digit}{3,}|0${digit}{3})`;
+  const monthFrag = match("monthFrag")`0[1-9]|1[0-2]`;
+  const dayFrag = match("dayFrag")`0[1-9]|[12]${digit}|3[01]`;
+  const hourFrag = match("hourFrag")`[01]${digit}|2[0-3]`;
+  const minuteFrag = match("minuteFrag")`[0-5]${digit}`;
+  const secondFrag = match(
+    "secondFrag",
+  )`[0-5]${digit}(?:\.${digit}+)?`;
+  const endOfDayFrag = match("endOfDayFrag")`24:00:00(?:\.0+)?`;
+  const timezoneFrag = match(
+    "timezoneFrag",
+  )`Z|[+-](?:(?:0${digit}|1[0-3]):${minuteFrag}|14:00)`;
+  const dateTimeLexicalRep = match("dateTimeLexicalRep", ($) => {
+    const components = stringSplit($, "-");
+    return components[0] === ""
+      ? dayOfMonthValuesConstraint(
+        substring(components[3], 0, 2),
+        components[2],
+        `-${components[1]}`,
+      )
+      : dayOfMonthValuesConstraint(
+        substring(components[2], 0, 2),
+        components[1],
+        components[0],
+      );
+  })`${yearFrag}-${monthFrag}-${dayFrag}T(?:${hourFrag}:${minuteFrag}:${secondFrag}|${endOfDayFrag})${timezoneFrag}?`;
+  const timeLexicalRep = match(
+    "timeLexicalRep",
+  )`(?:${hourFrag}:${minuteFrag}:${secondFrag}|${endOfDayFrag})${timezoneFrag}?`;
+  const dateLexicalRep = match("dateLexicalRep", ($) => {
+    const components = stringSplit($, "-");
+    return components[0] === ""
+      ? dayOfMonthValuesConstraint(
+        substring(components[3], 0, 2),
+        components[2],
+        `-${components[1]}`,
+      )
+      : dayOfMonthValuesConstraint(
+        substring(components[2], 0, 2),
+        components[1],
+        components[0],
+      );
+  })`${yearFrag}-${monthFrag}-${dayFrag}${timezoneFrag}?`;
+  const gYearMonthLexicalRep = match(
+    "gYearMonthLexicalRep",
+  )`${yearFrag}-${monthFrag}${timezoneFrag}?`;
+  const gYearLexicalRep = match(
+    "gYearLexicalRep",
+  )`${yearFrag}${timezoneFrag}?`;
+  const gMonthDayLexicalRep = match("gMonthDayLexicalRep", ($) => {
+    const components = stringSplit(substring($, 2), "-");
+    return dayOfMonthValuesConstraint(
+      substring(components[1], 0, 2),
+      components[0],
+    );
+  })`--${monthFrag}-${dayFrag}${timezoneFrag}?`;
+  const gDayLexicalRep = match(
+    "gDayLexicalRep",
+  )`---${dayFrag}${timezoneFrag}?`;
+  const gMonthLexicalRep = match(
+    "gMonthLexicalRep",
+  )`--${monthFrag}${timezoneFrag}?`;
+  const hexDigit = match("hexDigit")`[0-9a-fA-F]`;
+  const hexOctet = match("hexOctet")`${hexDigit}{2}`;
+  const hexBinary = match("hexBinary")`${hexOctet}*`;
+  const B04char = match("B04char")`[AQgw]`;
+  const B04 = match("B04")`${B04char}\u{20}?`;
+  const B16char = match("B16char")`[AEIMQUYcgkosw048]`;
+  const B16 = match("B16")`${B16char}\u{20}?`;
+  const B64char = match("B64char")`[A-Za-z0-9+/]`;
+  const B64 = match("B64")`${B64char}\u{20}?`;
+  const Padded8 = match("Padded8")`${B64}${B04}=\u{20}?=`;
+  const Padded16 = match("Padded16")`${B64}{2}${B16}=`;
+  const B64finalquad = match("B64finalquad")`${B64}{3}${B64char}`;
+  const B64final = match(
+    "B64final",
+  )`${B64finalquad}|${Padded16}|${Padded8}`;
+  const B64quad = match("B64quad")`${B64}{4}`;
+  const Base64Binary = match(
+    "Base64Binary",
+  )`(?:${B64quad}*${B64final})?`;
+  const CanonicalPadded = match(
+    "CanonicalPadded",
+  )`${B64char}{2}${B16char}=|${B64char}${B04char}==`;
+  const CanonicalQuad = match("CanonicalQuad")`${B64char}{4}`;
+  const Canonical·base64Binary = match(
+    "Canonical·base64Binary",
+  )`${CanonicalQuad}*${CanonicalPadded}?`;
+  const yearMonthDurationLexicalRep = match(
+    "yearMonthDurationLexicalRep",
+  )`-?P${duYearMonthFrag}`;
+  const dayTimeDurationLexicalRep = match(
+    "dayTimeDurationLexicalRep",
+  )`-?P${duDayTimeFrag}`;
+  const dateTimeStampLexicalRep = match(
+    "dateTimeStampLexicalRep",
+    ($) => {
+      const components = stringSplit($, "-");
+      return components[0] === ""
+        ? dayOfMonthValuesConstraint(
+          substring(components[3], 0, 2),
+          components[2],
+          `-${components[1]}`,
+        )
+        : dayOfMonthValuesConstraint(
+          substring(components[2], 0, 2),
+          components[1],
+          components[0],
+        );
+    },
+  )`${yearFrag}-${monthFrag}-${dayFrag}T(?:${hourFrag}:${minuteFrag}:${secondFrag}|${endOfDayFrag})${timezoneFrag}`;
+
+  return matchers;
+})();

diff --git a/xsd/productions.test.js b/xsd/productions.test.js
new file mode 100644 (file)
index 0000000..351bc25
--- /dev/null
+++ b/xsd/productions.test.js
@@ -0,0 +1,18 @@
+// ♓️🪡 सूत्र ∷ xsd/productions.test.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+import { assert, assertStrictEquals } from "../dev-deps.js";
+import * as productions from "./productions.js";
+
+Deno.test("Exports a correctly‐named value for each production", () => {
+  for (const [name, matcher] of Object.entries(productions)) {
+    assert(matcher != null, name);
+    assertStrictEquals(matcher.name, name);
+  }
+});

diff --git a/xsd/values.js b/xsd/values.js
new file mode 100644 (file)
index 0000000..ca5eb5b
--- /dev/null
+++ b/xsd/values.js
@@ -0,0 +1,17 @@
+// ♓️🪡 सूत्र ∷ xsd/values.js
+// ====================================================================
+//
+// Copyright © 2023 Lady [@ Lady’s Computer].
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at <https://mozilla.org/MPL/2.0/>.
+
+export {
+  NAN as notANumber,
+  NEGATIVE_INFINITY as negativeInfinity,
+  NEGATIVE_ZERO as negativeZero,
+  POSITIVE_INFINITY as positiveInfinity,
+  POSITIVE_ZERO as positiveZero,
+  UNDEFINED as absent,
+} from "../deps.js";