Addition of 3 more databases

MANIFEST.in

@@ -2,6 +2,7 @@ include versioneer.py
 include pyxray/_version.py
 include pyxray/data/*.asc
 include pyxray/data/*.csv
+include pyxray/data/*.txt
 recursive-include tests *.py
 exclude pyxray/data/cache
 exclude pyxray/data/*.sql

pyxray/parser/chantler2005.py

@@ -0,0 +1,97 @@
+#!/usr/bin/env python
+"""
+Parser for the NIST FFAST database compiled by Chantler C. T., et.al.
+"""
+
+# Standard library modules.
+import logging
+import os
+import pkgutil
+
+# Third party modules.
+
+
+# Local modules.
+import pyxray.parser.base as base
+from pyxray.descriptor import Reference, Element
+from pyxray.property import (
+    ElementAtomicWeight,
+    ElementMassDensity,
+    AtomicSubshellBindingEnergy,
+)
+
+# Globals and constants variables.
+logger = logging.getLogger(__name__)
+
+CHANTLER2005 = Reference(
+    "chantler2005",
+    author="Chantler, C.T. and Olsen, K. and Dragoset, R.A. and Chang, J. and Kishore, A.R. and Kotochigova, S.A. and "
+    "Zucker, D.S.",
+    year="2005",
+    title="X-Ray Form Factor, Attenuation, and Scattering Tables (version 2.1)",
+    publisher="National Institute of Standards and Technology, Gaithersburg, MD, USA",
+    doi="10.18434/T4HS32",
+    howpublished="Online",
+    url="http://physics.nist.gov/ffast",
+)
+
+_SUBSHELLS = [
+    base.K,
+    base.L1,
+    base.L2,
+    base.L3,
+    base.M1,
+    base.M2,
+    base.M3,
+    base.M4,
+    base.M5,
+    base.N1,
+    base.N2,
+    base.N3,
+    base.N4,
+    base.N5,
+    base.N6,
+    base.N7,
+    base.O1,
+    base.O2,
+    base.O3,
+    base.O4,
+    base.O5,
+    base.P1,
+    base.P2,
+    base.P3,
+]
+
+_NUM_SUBSHELLS = 24
+
+
+class Chantler2005Parser(base._Parser):
+    def __iter__(self):
+        relpath = os.path.join("..", "data", "shelldata.csv")
+        content = pkgutil.get_data(__name__, relpath).decode("utf8")
+
+        rows = content.splitlines()
+        n_rows = len(rows)
+
+        for z in range(1, len(rows)):
+            row = [item.strip() for item in rows[z].split(",")]
+            element = Element(z)
+
+            prop = ElementAtomicWeight(CHANTLER2005, element, float(row[0]))
+            logger.debug(f"Parsed: {prop}")
+            yield prop
+
+            prop = ElementMassDensity(CHANTLER2005, element, float(row[2]) * 1e3)
+            logger.debug(f"Parsed: {prop}")
+            yield prop
+
+            for i in range(_NUM_SUBSHELLS):
+                value = row[i + 7]
+                if value:
+                    prop = AtomicSubshellBindingEnergy(
+                        CHANTLER2005, element, _SUBSHELLS[i], float(value)
+                    )
+                    logger.debug(f"Parsed: {prop}")
+                    yield prop
+
+            self.update(int(z / n_rows * 100))