Allow stepped integer parameters.

doc/src/cylc-user-guide/cug.tex

@@ -4379,6 +4379,7 @@ \subsubsection{Parameter Expansion}
     [[parameters]]
         obs = ship, buoy, plane
         run = 1..5  # 1, 2, 3, 4, 5
+        idx = 1..9..2  # 1, 3, 5, 7, 9
 \end{lstlisting}
 Then angle brackets denote use of these parameters throughout the suite
 definition. For the values above, this parameterized name:

doc/src/cylc-user-guide/suiterc.tex

@@ -234,13 +234,13 @@ \subsection{[cylc]}
     \item {\em default:} False
 \end{myitemize}
 
-\subsubsection[parameters]{[cylc] \textrightarrow parameters}
+\subsubsection[{[[}parameters{]]}]{[cylc] \textrightarrow [[parameters]]}
 
 Define parameter values here for use in expanding {\em parameterized tasks} -
 see Section~\ref{Parameterized Tasks}.
 \begin{myitemize}
     \item {\em type:} list of strings, or an integer range
-        \lstinline=LOWER..UPPER= (two dots, inclusive bounds)
+        \lstinline=LOWER..UPPER..STEP= (two dots, inclusive bounds, STEP optional)
     \item {\em default:} (none)
     \item {\em examples:}
         \begin{myitemize}
@@ -249,7 +249,7 @@ \subsection{[cylc]}
         \end{myitemize}
 \end{myitemize}
 
-\subsubsection[parameter templates]{[cylc] \textrightarrow parameter templates}
+\subsubsection[{[[}parameter templates{]]}]{[cylc] \textrightarrow [[parameter templates]]}
 \label{RefParameterTemplates}
 
 Parameterized task names (see previous item, and Section~\ref{Parameterized

lib/cylc/cfgspec/suite.py

@@ -36,7 +36,7 @@
 from cylc.network import PRIVILEGE_LEVELS
 
 
-REC_PARAM_INT_RANGE = re.compile('(\d+)\.\.(\d+)')
+REC_PARAM_INT_RANGE = re.compile('(\d+)\.\.(\d+)(?:\.\.(\d+))?')
 
 
 def _coerce_cycleinterval(value, keys, _):
@@ -141,19 +141,19 @@ def _coerce_final_cycletime(value, keys, _):
 def _coerce_parameter_list(value, keys, _):
     """Coerce parameter list."""
     value = _strip_and_unquote_list(keys, value)
-    if len(value) == 1:
-        # May be a range e.g. '1..5' (bounds inclusive)
-        try:
-            lower, upper = REC_PARAM_INT_RANGE.match(value[0]).groups()
-        except AttributeError:
-            if '.' in value[0]:
-                # Dot is illegal in node names, probably bad range syntax.
-                raise IllegalValueError("parameter", keys, value)
-        else:
-            n_dig = len(upper)
-            return [
-                str(i).zfill(n_dig) for i in range(int(lower), int(upper) + 1)]
-    return value
+    # May be an integer range with step e.g. '1..6..2' (bounds inclusive).
+    try:
+        lower, upper, step = REC_PARAM_INT_RANGE.match(value[0]).groups()
+        step = step or 1
+    except AttributeError:
+        if '.' in value[0]:
+            # Dot is illegal in node names, probably bad range syntax.
+            raise IllegalValueError("parameter", keys, value)
+        return value
+    else:
+        n_dig = len(upper)
+        return [str(i).zfill(n_dig) for i in
+                range(int(lower), int(upper) + 1, int(step))]
 
 coercers['cycletime'] = _coerce_cycletime
 coercers['cycletime_format'] = _coerce_cycletime_format

lib/cylc/graph_parser.py

@@ -1,4 +1,4 @@
-#!usr/bin/env python
+#!/usr/bin/env python
 
 # THIS FILE IS PART OF THE CYLC SUITE ENGINE.
 # Copyright (C) 2008-2017 NIWA

tests/param_expand/01-basic.t

@@ -0,0 +1,31 @@
+#!/bin/bash
+# THIS FILE IS PART OF THE CYLC SUITE ENGINE.
+# Copyright (C) 2008-2017 NIWA
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#-------------------------------------------------------------------------------
+# check tasks and graph generated by parameter expansion.
+. $(dirname $0)/test_header
+#-------------------------------------------------------------------------------
+set_test_number 2
+#-------------------------------------------------------------------------------
+install_suite $TEST_NAME_BASE $TEST_NAME_BASE
+#-------------------------------------------------------------------------------
+TEST_NAME=$TEST_NAME_BASE-validate
+run_ok $TEST_NAME cylc validate "${SUITE_NAME}"
+#-------------------------------------------------------------------------------
+cylc graph --reference $SUITE_NAME > new.graph.ref
+cmp_ok new.graph.ref $TEST_SOURCE_DIR/$TEST_NAME_BASE/graph.ref
+#-------------------------------------------------------------------------------
+purge_suite $SUITE_NAME

tests/param_expand/01-basic/graph.ref

@@ -0,0 +1,48 @@
+edge "foo_cat.1" "bar_j1.1" solid
+edge "foo_cat.1" "bar_j2.1" solid
+edge "foo_cat.1" "bar_j3.1" solid
+edge "foo_cat.1" "bar_j4.1" solid
+edge "foo_cat.1" "bar_j5.1" solid
+edge "foo_dog.1" "bar_j1.1" solid
+edge "foo_dog.1" "bar_j2.1" solid
+edge "foo_dog.1" "bar_j3.1" solid
+edge "foo_dog.1" "bar_j4.1" solid
+edge "foo_dog.1" "bar_j5.1" solid
+edge "foo_fish.1" "bar_j1.1" solid
+edge "foo_fish.1" "bar_j2.1" solid
+edge "foo_fish.1" "bar_j3.1" solid
+edge "foo_fish.1" "bar_j4.1" solid
+edge "foo_fish.1" "bar_j5.1" solid
+edge "qux_j1.1" "waz_k01.1" solid
+edge "qux_j1.1" "waz_k05.1" solid
+edge "qux_j1.1" "waz_k09.1" solid
+edge "qux_j2.1" "waz_k01.1" solid
+edge "qux_j2.1" "waz_k05.1" solid
+edge "qux_j2.1" "waz_k09.1" solid
+edge "qux_j3.1" "waz_k01.1" solid
+edge "qux_j3.1" "waz_k05.1" solid
+edge "qux_j3.1" "waz_k09.1" solid
+edge "qux_j4.1" "waz_k01.1" solid
+edge "qux_j4.1" "waz_k05.1" solid
+edge "qux_j4.1" "waz_k09.1" solid
+edge "qux_j5.1" "waz_k01.1" solid
+edge "qux_j5.1" "waz_k05.1" solid
+edge "qux_j5.1" "waz_k09.1" solid
+graph
+node "bar_j1.1" "bar_j1\n1" unfilled box black
+node "bar_j2.1" "bar_j2\n1" unfilled box black
+node "bar_j3.1" "bar_j3\n1" unfilled box black
+node "bar_j4.1" "bar_j4\n1" unfilled box black
+node "bar_j5.1" "bar_j5\n1" unfilled box black
+node "foo_cat.1" "foo_cat\n1" unfilled box black
+node "foo_dog.1" "foo_dog\n1" unfilled box black
+node "foo_fish.1" "foo_fish\n1" unfilled box black
+node "qux_j1.1" "qux_j1\n1" unfilled box black
+node "qux_j2.1" "qux_j2\n1" unfilled box black
+node "qux_j3.1" "qux_j3\n1" unfilled box black
+node "qux_j4.1" "qux_j4\n1" unfilled box black
+node "qux_j5.1" "qux_j5\n1" unfilled box black
+node "waz_k01.1" "waz_k01\n1" unfilled box black
+node "waz_k05.1" "waz_k05\n1" unfilled box black
+node "waz_k09.1" "waz_k09\n1" unfilled box black
+stop

tests/param_expand/01-basic/suite.rc

@@ -0,0 +1,18 @@
+[cylc]
+    [[parameters]]
+        i = cat, dog, fish
+	j = 1..5
+	k = 1..10..4
+[scheduling]
+    [[dependencies]]
+        graph = """
+            foo<i> => bar<j>
+	    qux<j> => waz<k>
+	"""
+[runtime]
+    [[root]]
+	script = true
+    [[foo<i>]]
+    [[bar<j>]]
+    [[qux<j>]]
+    [[waz<k>]]