Commit c2e51811c9556b54fd97a87b298d93387180fa75 - ndbl

More explanation Getty Ritter 9 years ago

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46	46	have this property in practice.
47	47
48	48	As a pleasant but unintended side effect, an executable bash file that
49		does nothing but define environment variables is trivially an NDBL
	49	does nothing but define environment variables is often trivially an NDBL
50	50	file.
51	51
52	52	Structure of an NDBL Document

87	87	Examples With Explanation
88	88	-------------------------
89	89
90		In the examples below, I will use `{ key: value }` as shorthand to represent a
91		multimap.
	90	In the examples below, I will use `[ key: value ]` as shorthand to represent an
	91	ordered sequence of key-value pairs.
92	92
93	93	host=machine1
94	94	host=machine2
95	95
96	96	This parses to the following structure:
97	97
98		[~~{host:machine1},{host:machine2}~~]
	98	[[ "host": "machine1" ], [ "host": "machine2" ]]
99	99
100	100	Adding indentation merges the two multisets, as the second line is now
101	101	considered a 'cotinuation' of the first group.

105	105
106	106	This becomes
107	107
108		[~~{host:machine1,host:machine2}~~]
	108	[[ "host": "machine1", "host": "machine2" ]]
109	109
110	110	A third non-indented line will then start a new group:
111	111

115	115
116	116	This becomes
117	117
118		[~~{host:machine1,host:machine2},{host:machine3}]~~
	118	[ [ "host": "machine1"
	119	, "host": "machine2"
	120	]
	121	, [ "host": "machine3" ]
	122	]
119	123
120		Empty values are permitted, and ~~can be used as a tag of sorts.~~
	124	Empty values are permitted, and are idiomatically used as a 'header' for a group
	125	of configuration options:
121	126
122	127	database=
123	128	file=file1.txt

126	131
127	132	This becomes
128	133
129		[~~{database:},{file:file1.txt},{file:file2.txt},{file:file3.txt}~~]
	134	[["database": "", "file": "file1.txt", "file": "file2.txt", "file": "file3.txt"]]
130	135
131	136	Comments are allowed but must come after a whitespace character, which
132	137	means that the following document contains no comments:

135	140
136	141	This becomes
137	142
138		[~~{key:value#hello}~~]
	143	[["key": "value#hello"]]
139	144
140	145	But this document does contain a comment:
141	146

143	148
144	149	This becomes
145	150
146		[~~{key:value}~~]
	151	[["key": "value"]]
147	152
148	153	Comments can begin a line, as well.
149	154

154	159	port=22
155	160	user=abu-al-walid
156	161	nicename="H-G Remote Server"
	162
	163	This document corresponds to
	164
	165	[ [ "host": "hg-remote"
	166	, "portforwarding": ""
	167	, "hostname": "hunter-gratzner.example.com"
	168	, "port": "22"
	169	, "user": "abu-al-walid"
	170	, "nicename": "H-G Remote Server"
	171	]
	172	]
157	173
158	174	NDBL does not provide arbitrarily-nested hierarchical strutures,
159	175	a list type, a numeric type, a boolean type, or other niceties. This does not