syntax: add reference syntax files for testing lexers

etc/syntax/reference-files/suite.rc

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+# SYNTAX numbering matches the table in https://github.com/cylc/cylc/issues/2752
+
+# SYNTAX: 1.
+
+# SYNTAX: 1.1
+# keys and values should display differently
+# sections should be highlighted
+[a]
+    b = c
+    [[d]]
+        -j = k  # keys can have hyphens
+        j j = k  # and spaces
+        g = h=i  # values can have equals
+        e = "f"  # and quotes
+        e = "${HOME} `$HOME`"  # and funny characters
+    [[l, m, n]]  # sections can be contain commas
+        [[[o]]]  # sections can be deeply nested
+
+# SYNTAX: 1.2
+l=m  # no comment
+
+# SYNTAX: 1.3
+# display should be consistant throught multi-line string
+n = """foo"""
+n = """
+    foo
+    bar
+    baz
+"""
+
+# SYNTAX: 1.4
+# highlighting should be consistent with the following examples
+%include bar
+%include "bar/baz"
+%include "baz/bo ol"
+
+
+# SYNTAX: 2.
+graph = """
+    # settings should not be highlighted here
+    a = b
+
+    # SYNTAX: 2.1
+    # tasks and dependency arrows should display differently
+    foo => bar
+    foo=>bar
+
+    # chaining should work in-line and across lines ending in `=>` or `|`
+    foo => bar => baz
+    foo => bar =>
+    pub => baz
+    foo => \
+    bar => \
+    pub
+
+    # SYNTAX: 2.2
+    # comment highlighting should be un-affected
+    foo => bar  # pub
+    foo => bar  # pub => baz
+
+    # SYNTAX: 2.3
+    # &|() should be highlighted
+    # !foo should be highlighted
+    # ! foo should NOT be highlighted
+    foo | bar & baz => pub & qux
+    (foo | bar) & baz => (pub & qux)
+    foo => !foo & bar
+    ! foo => bar
+
+    # SYNTAX: 2.4
+    # text inside <> should be highlighted
+    # optionally suite / task could be highlighted
+    <other.suite::foo> => foo
+    foo & <other.suite::task_bar> => baz
+
+    # SYNTAX: 2.5
+    # @x should be highlighted
+    @wall_clock => foo
+    foo & @myxtrig1 => bar
+
+    # SYNTAX: 2.6
+    # text inside <> should be highlighted
+    foo<x> => bar<x>
+    <x> => <y>
+
+    # SYNTAX: 2.7
+    # text inside <> should be highlighted
+    # optionally +- could be highlighted
+    <x-1> => <x+1>
+    <x - 1> => <x + 1>
+
+    # SYNTAX: 2.8
+    # text inside <> should be highlighted
+    # optionally = could be highlighted
+    a<x=1> => a<x=2>
+    a<x = 1> => a<x = 2>
+
+    # SYNTAX: 2.9
+    # qualifier should be highlighted, whole and nothing but
+    foo:succeed => bar
+    pub & foo:fail => bar
+    FOO:succeed-all => bar
+    foo:custom_a => bar
+
+    # SYNTAX: 2.10
+    # inter-cycle dep should be highlighted
+    foo[P1D] => bar
+    foo[-P1D] => bar
+    foo[-P1Y1M1DT1H1M1S] => bar
+    foo[^] => bar
+    foo[123] => bar  # optionally invalid offsets should display as an error
+"""
+
+# graph strings should not highlight here, this should display as a setting:
+foo => bar => baz => quz

etc/syntax/reference-files/suite_empy.rc

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+#!empy
+# ^ SYNTAX:3.1
+
+# SYNTAX numbering matches the table in https://github.com/cylc/cylc/issues/2752
+
+# SYNTAX: 3.2
+# templating code should be displayed diffently to cylc code
+@# no comment  # should display as a comment
+@foo
+@{foo="bar"}
+@{ foo = "bar" }
+@{ foo = "bar"; bar = "baz" }
+@{ foo = '%s' % 'bar' }
+@{ set foo = {"1": 2, "3", []} }  # highlight to the last }
+@{ set foo = foo.bar(1, 2, 3) }  # highlight to the last }
+@{ foo_bar }
+@{foo_bar}
+@{ foo.bar(1, 2, 3, []) }  # highlight to the last }
+@[if x]a = b@[end if]  # highlight all but "a = b"
+@[if x.y[]]a = b@[end if]  # highlight all but "a = b"
+a = b  
+# SYNTAX 3.3
+# non-exhaustive list of advanced empy syntax
+@# no comment
+@?NewContextName
+@!100
+invisible@ whitespace  # the @ character should be highlighted
+foo = @\0 bar @\xHH # @\0 and @\xHH should both be highlighted
+foo = @@  # the @@ should NOT be highlighted
+@"foo"  # this should be highlighted the same as @foo?
+@( x ? "true" ! "false )
+@os.environ
+@`x`
+@:2 + 2:
+:%title  "Cylc"
+**'@<CONTENTS>'**  # ???
+@[def f(x, y=z, **kwargs)] @[end def]
+@[try]  @[except]
+
+# SYNTAX 3./1.1
+# keys, values and sections outside of the templating code should display
+# as normal
+a = @b
+@a = b
+a = @( b + 1 )
+a = @( b_b | c.d('1', "2", 3) )
+[[@a}]]
+    d = e  # check highlighting of this line un-affected by section
+[[@( a_a | c.d('1', "2", 3) )]]
+    d = e  # check highlighting of this line un-affected by section
+[[@( "%(foo)s" % {"foo": "abc"} )]]
+    d = e  # check highlighting of this line un-affected by section
+
+# SYNTAX 3./1.2
+# comments outside of the templating code should display as normal
+@( foo )  # foo
+@{ foo }  # foo
+@[ foo ]  # foo
+
+# syntax 3./1.3
+# tasks and deps outside of the templating code should display as normal
+graph = """
+    foo => @( b_az.pub('1', "2", 3) ) => qux =>
+@[ if BAR ]
+    bar => pub
+@[ else ]
+    baz => pub
+@[ endif ]
+"""
+
+# syntax 3./2.5
+# clashing xtrigger and empy syntax should somehow be handled
+graph = """
+    @wall_clock => @@bar => baz  # note empy evaluates @@ as @
+"""

etc/syntax/reference-files/suite_jinja2.rc

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+#!Jinja2
+# ^ SYNTAX:3.1
+
+# SYNTAX numbering matches the table in https://github.com/cylc/cylc/issues/2752
+
+# SYNTAX: 3.2
+# templating code should be displayed diffently to cylc code
+{# no comment #}  # should display as a comment
+{% set foo = "bar" %}
+{% set foo = '%s' % 'bar' %}
+{% set foo = {"1": 2, "3", []} %}
+{% set foo = foo.bar(1, 2, 3) %}
+{{ foo_bar }}
+{{ foo.bar(1, 2, 3) }}
+{{ foo | bar(1, 2, 3) }}
+{% include 'foo' %}
+{% include ['foo', 'bar'] %}
+{% import 'foo' as foo %}
+{% from 'foo' import foo as a, b %}
+
+# SYNTAX 3.3
+# multi-line templating code should be consistent with single-line code
+{#
+    no comment
+#}  # all three lines should display as a single comment
+{# a
+   b
+   c #}  # all three lines should display as a single comment
+{%
+    set foo = {"1": 2, "3", []}
+%}
+{% set foo = {
+    "1": 2,
+    "3", []} %}
+
+
+
+# SYNTAX 3./1.1
+# keys, values and sections outside of the templating code should display
+# as normal
+a = {{ b }}
+{{ a }} = b
+a = {{ b + 1 }}
+a = {{ b_b | c.d('1', "2", 3) }}
+[[{{ a }}]]
+    d = e  # check highlighting of this line un-affected by section
+[[{{ a_a | c.d('1', "2", 3) }}]]
+    d = e  # check highlighting of this line un-affected by section
+[[a{{ b }}c]]
+    d = e  # check highlighting of this line un-affected by section
+[[{{ "%(foo)s" % {"foo": "abc"}}}]]
+    d = e  # check highlighting of this line un-affected by section
+
+# SYNTAX 3./1.2
+# comments outside of the templating code should display as normal
+{# foo #}  # foo
+{% foo %}  # foo
+{{ foo }}  # foo
+
+# SYNTAX 3./1.3
+# tasks and deps outside of the templating code should display as normal
+graph = """
+    foo => {{ bar }} => qux
+    foo => {{ b_ar | baz.pub('1', "2", 3) }} => qux =>
+{% if BAR %}
+    bar => pub
+{% else %}
+    baz => pub
+{% endif %}
+"""