Updated and added examples
Getty Ritter
7 years ago
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{
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# comments start with an octothorpe
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# objects are created with key-value pairs, but don't use
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# commas or colons
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# objects are created with key-value pairs separated
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# by commas
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"one": 1 |
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"one": 1, # integers
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"two": 2.0 |
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"two": 2.0, # floats
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"three": [ # lists use square brackets
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"s" # the string syntax is identical to JSON's
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"s" # again, no commas are necessary
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"0"
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]
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"s", # the string syntax is identical to JSON's
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"s",
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"0", # trailing commas ARE allowed
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],
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"four": # stitched expressions are fully contained in parens
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( 2 + 2 ) |
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( 2 + 2 ),
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# the with keyword introduces a binding, of the form
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# with ( [ident] [arg1 arg2 ... argn] = [expr] )
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# with [ident] [arg1 arg2 ... argn] = [expr];
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# these can occur anywhere and are ignored, but are scoped
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# to the data structure in which they occur
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with
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incr x = x + 1;
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# to the data structure in which they occur (?)
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with incr x = x + 1;
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"five": (incr 4) |
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"five": (incr 4),
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# this entire file denotes the JSON document
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# { "one": 1,
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[
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# Virgil allows list and dictionary comprehensions in
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# code splices
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`[ x | x in [ 1, 2, 3 ] ],
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# comprehensions over multiple generators
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`[ [x,y] | x in [ 1, 2 ]
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, y in [ 1, 2 ]
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],
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# parallel comprehensions
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`[ [x,y] | x in [ 1, 2 ]
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| y in [ 1, 2 ]
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],
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`{ v: k | k: v in { "one": "un", "two": "du", "three": "tri" } },
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# the generator expression can be either a list or a dict,
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# regardless of the final value of the comprehension
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`{ str(x): x + 1 | x in [ 1, 2, 3 ] },
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# this file is equivalent to
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# [
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# [ 1, 2, 3 ],
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# [ [1,1], [1,2], [2,1], [2,2] ],
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# [ [1,1], [2,2], ],
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# { "un": "one", "du": "two", "tri": "three" },
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# { "1": 1, "two": 2, "three": 3 },
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# ]
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]⏎
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{
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# comments start with an octothorpe
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# objects are created with key-value pairs, but don't use
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# commas or colons
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# objects are created with key-value pairs
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"one": 1 |
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"one": 1, # integers
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"two": 2.0 |
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"two": 2.0, # floats
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# lists use square brackets
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"three":
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[
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"s" # the string syntax is identical to JSON's
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"s" # again, no commas are necessary
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"0"
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]
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"s", # the string syntax is identical to JSON's
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"s",
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"0", # trailing commas are allowed
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],
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}
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[ # stitching of expressions
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]⏎
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