Use a Wadler style pretty printer in the Lua REPL (#334)
- Add a cc.pretty module, which provides a Wadler style pretty printer [1].
- The cc.pretty.pretty function converts an arbitrary object into a
pretty-printed document. This can then be printed to the screen with
cc.pretty.{write, print} or converted to a string with cc.pretty.render.
- Convert the Lua REPL to use the pretty printer rather than
textutils.serialise.
[1]: http://homepages.inf.ed.ac.uk/wadler/papers/prettier/prettier.pdf
This commit is contained in:
Jonathan Coates
GitHub
parent
c79f643ba7
commit
798868427e
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@ -0,0 +1,416 @@
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--- Provides a "pretty printer", for rendering data structures in an
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-- aesthetically pleasing manner.
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--
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-- In order to display something using @{cc.pretty}, you build up a series of
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-- @{documents|Doc}. These behave a little bit like strings; you can concatenate
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-- them together and then print them to the screen.
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--
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-- However, documents also allow you to control how they should be printed. There
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-- are several functions (such as @{nest} and @{group}) which allow you to control
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-- the "layout" of the document. When you come to display the document, the 'best'
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-- (most compact) layout is used.
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--
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-- @module cc.pretty
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-- @usage Print a table to the terminal
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-- local pretty = require "cc.pretty"
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-- pretty.write(pretty.dump({ 1, 2, 3 }))
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--
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-- @usage Build a custom document and display it
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-- local pretty = require "cc.pretty"
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-- pretty.write(pretty.group(pretty.text("hello") .. pretty.space_line .. pretty.text("world")))
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local expect = require "cc.expect".expect
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local type, getmetatable, setmetatable, colours, str_write = type, getmetatable, setmetatable, colours, write
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--- @{table.insert} alternative, but with the length stored inline.
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local function append(out, value)
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local n = out.n + 1
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out[n], out.n = value, n
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end
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--- A document, which
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--
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-- Documents effectively represent a sequence of strings in alternative layouts,
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-- which we will try to print in the most compact form necessary.
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--
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-- @type Doc
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local Doc = { }
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--- An empty document.
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local empty = setmetatable({ tag = "nil" }, Doc)
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--- A document with a single space in it.
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local space = setmetatable({ tag = "text", text = " " }, Doc)
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--- A line break. When collapsed with @{group}, this will be replaced with @{empty}.
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local line = setmetatable({ tag = "line", flat = empty }, Doc)
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--- A line break. When collapsed with @{group}, this will be replaced with @{space}.
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local space_line = setmetatable({ tag = "line", flat = space }, Doc)
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local text_cache = { [""] = empty, [" "] = space, ["\n"] = space_line }
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local function mk_text(text, colour)
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return text_cache[text] or setmetatable({ tag = "text", text = text, colour = colour }, Doc)
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end
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--- Create a new document from a string.
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--
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-- If your string contains multiple lines, @{group} will flatten the string
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-- into a single line, with spaces between each line.
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--
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-- @tparam string text The string to construct a new document with.
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-- @tparam[opt] number colour The colour this text should be printed with. If not given, we default to the current
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-- colour.
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-- @treturn Doc The document with the provided text.
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local function text(text, colour)
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expect(1, text, "string")
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expect(2, colour, "number", "nil")
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local cached = text_cache[text]
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if cached then return cached end
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local new_line = text:find("\n", 1)
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if not new_line then return mk_text(text, colour) end
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-- Split the string by "\n". With a micro-optimisation to skip empty strings.
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local doc = setmetatable({ tag = "concat", n = 0 }, Doc)
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if new_line ~= 1 then append(doc, mk_text(text:sub(1, new_line - 1), colour)) end
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new_line = new_line + 1
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while true do
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local next_line = text:find("\n", new_line)
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append(doc, space_line)
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if not next_line then
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if new_line <= #text then append(doc, mk_text(text:sub(new_line), colour)) end
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return doc
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else
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if new_line <= next_line - 1 then
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append(doc, mk_text(text:sub(new_line, next_line - 1), colour))
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end
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new_line = next_line + 1
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end
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end
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end
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--- Concatenate several documents together. This behaves very similar to string concatenation.
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-- @tparam Doc|string ... The documents to concatenate.
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-- @treturn Doc The concatenated documents.
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-- @usage pretty.concat(doc1, " - ", doc2)
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-- @usage doc1 .. " - " .. doc2
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local function concat(...)
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local args = table.pack(...)
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for i = 1, args.n do
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if type(args[i]) == "string" then args[i] = text(args[i]) end
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if getmetatable(args[i]) ~= Doc then expect(i, args[i], "document") end
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end
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if args.n == 0 then return empty end
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if args.n == 1 then return args[1] end
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args.tag = "concat"
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return setmetatable(args, Doc)
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end
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Doc.__concat = concat
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--- Indent later lines of the given document with the given number of spaces.
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--
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-- For instance, nesting the document
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-- ```txt
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-- foo
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-- bar
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-- ``
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-- by two spaces will produce
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-- ```txt
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-- foo
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-- bar
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-- ```
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--
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-- @tparam number depth The number of spaces with which the document should be indented.
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-- @tparam Doc doc The document to indent.
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-- @treturn Doc The nested document.
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-- @usage pretty.nest(2, pretty.text("foo\nbar"))
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local function nest(depth, doc)
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expect(1, depth, "number")
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if getmetatable(doc) ~= Doc then expect(2, doc, "document") end
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if depth <= 0 then error("depth must be a positive number", 2) end
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return setmetatable({ tag = "nest", depth = depth, doc }, Doc)
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end
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local function flatten(doc)
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if doc.flat then return doc.flat end
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local kind = doc.tag
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if kind == "nil" or kind == "text" then
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return doc
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elseif kind == "concat" then
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local out = setmetatable({ tag = "concat", n = doc.n }, Doc)
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for i = 1, doc.n do out[i] = flatten(doc[i]) end
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doc.flat, out.flat = out, out -- cache the flattened node
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return out
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elseif kind == "nest" then
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return flatten(doc[1])
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elseif kind == "group" then
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return doc[1]
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else
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error("Unknown doc " .. kind)
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end
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end
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--- Builds a document which is displayed on a single line if there is enough
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-- room, or as normal if not.
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--
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-- @tparam Doc doc The document to group.
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-- @treturn Doc The grouped document.
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local function group(doc)
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if getmetatable(doc) ~= Doc then expect(1, doc, "document") end
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if doc.tag == "group" then return doc end -- Skip if already grouped.
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local flattened = flatten(doc)
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if flattened == doc then return doc end -- Also skip if flattening does nothing.
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return setmetatable({ tag = "group", flattened, doc }, Doc)
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end
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local function get_remaining(doc, width)
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local kind = doc.tag
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if kind == "nil" or kind == "line" then
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return width
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elseif kind == "text" then
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return width - #doc.text
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elseif kind == "concat" then
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for i = 1, doc.n do
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width = get_remaining(doc[i], width)
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if width < 0 then break end
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end
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return width
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elseif kind == "group" or kind == "nest" then
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return get_remaining(kind[1])
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else
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error("Unknown doc " .. kind)
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end
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end
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--- Display a document on the terminal.
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--
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-- @tparam Doc doc The document to render
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-- @tparam[opt] number ribbon_frac The maximum fraction of the width that we should write in.
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local function write(doc, ribbon_frac)
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if getmetatable(doc) ~= Doc then expect(1, doc, "document") end
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expect(2, ribbon_frac, "number", "nil")
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local term = term
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local width, height = term.getSize()
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local ribbon_width = (ribbon_frac or 0.6) * width
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if ribbon_width < 0 then ribbon_width = 0 end
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if ribbon_width > width then ribbon_width = width end
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local def_colour = term.getTextColour()
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local current_colour = def_colour
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local function go(doc, indent, col)
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local kind = doc.tag
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if kind == "nil" then
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return col
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elseif kind == "text" then
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local doc_colour = doc.colour or def_colour
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if doc_colour ~= current_colour then
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term.setTextColour(doc_colour)
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current_colour = doc_colour
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end
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str_write(doc.text)
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return col + #doc.text
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elseif kind == "line" then
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local _, y = term.getCursorPos()
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if y < height then
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term.setCursorPos(indent + 1, y + 1)
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else
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term.scroll(1)
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term.setCursorPos(indent + 1, height)
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end
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return indent
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elseif kind == "concat" then
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for i = 1, doc.n do col = go(doc[i], indent, col) end
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return col
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elseif kind == "nest" then
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return go(doc[1], indent + doc.depth, col)
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elseif kind == "group" then
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if get_remaining(doc[1], math.min(width, ribbon_width + indent) - col) >= 0 then
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return go(doc[1], indent, col)
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else
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return go(doc[2], indent, col)
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end
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else
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error("Unknown doc " .. kind)
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end
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end
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local col = math.max(term.getCursorPos() - 1, 0)
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go(doc, 0, col)
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if current_colour ~= def_colour then term.setTextColour(def_colour) end
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end
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--- Display a document on the terminal with a trailing new line.
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--
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-- @tparam Doc doc The document to render.
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-- @tparam[opt] number ribbon_frac The maximum fraction of the width that we should write in.
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local function print(doc, ribbon_frac)
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if getmetatable(doc) ~= Doc then expect(1, doc, "document") end
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expect(2, ribbon_frac, "number", "nil")
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write(doc, ribbon_frac)
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str_write("\n")
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end
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--- Render a document, converting it into a string.
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--
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-- @tparam Doc doc The document to render.
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-- @tparam[opt] number width The maximum width of this document. Note that long strings will not be wrapped to
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-- fit this width - it is only used for finding the best layout.
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-- @tparam[opt] number ribbon_frac The maximum fraction of the width that we should write in.
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local function render(doc, width, ribbon_frac)
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if getmetatable(doc) ~= Doc then expect(1, doc, "document") end
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expect(2, width, "number", "nil")
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expect(3, ribbon_frac, "number", "nil")
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local ribbon_width
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if width then
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ribbon_width = (ribbon_frac or 0.6) * width
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if ribbon_width < 0 then ribbon_width = 0 end
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if ribbon_width > width then ribbon_width = width end
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end
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local out = { n = 0 }
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local function go(doc, indent, col)
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local kind = doc.tag
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if kind == "nil" then
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return col
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elseif kind == "text" then
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append(out, doc.text)
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return col + #doc.text
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elseif kind == "line" then
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append(out, "\n" .. (" "):rep(indent))
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return indent
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elseif kind == "concat" then
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for i = 1, doc.n do col = go(doc[i], indent, col) end
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return col
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elseif kind == "nest" then
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return go(doc[1], indent + doc.depth, col)
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elseif kind == "group" then
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if not width or get_remaining(doc[1], math.min(width, ribbon_width + indent) - col) >= 0 then
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return go(doc[1], indent, col)
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else
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return go(doc[2], indent, col)
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end
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else
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error("Unknown doc " .. kind)
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end
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end
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go(doc, 0, 0)
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return table.concat(out, "", 1, out.n)
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end
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local keywords = {
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[ "and" ] = true, [ "break" ] = true, [ "do" ] = true, [ "else" ] = true,
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[ "elseif" ] = true, [ "end" ] = true, [ "false" ] = true, [ "for" ] = true,
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[ "function" ] = true, [ "if" ] = true, [ "in" ] = true, [ "local" ] = true,
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[ "nil" ] = true, [ "not" ] = true, [ "or" ] = true, [ "repeat" ] = true, [ "return" ] = true,
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[ "then" ] = true, [ "true" ] = true, [ "until" ] = true, [ "while" ] = true,
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}
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local comma = text(",")
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local braces = text("{}")
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local obrace, cbrace = text("{"), text("}")
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local obracket, cbracket = text("["), text("] = ")
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local function key_compare(a, b)
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local ta, tb = type(a), type(b)
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if ta == "string" then return tb ~= "string" or a < b
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elseif tb == "string" then return false
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end
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if ta == "number" then return tb ~= "number" or a < b end
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return false
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end
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local function pretty_impl(obj, tracking)
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local obj_type = type(obj)
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if obj_type == "string" then
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local formatted = ("%q"):format(obj):gsub("\\\n", "\\n")
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return text(formatted, colours.red)
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elseif obj_type == "number" then
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return text(tostring(obj), colours.magenta)
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elseif obj_type ~= "table" or tracking[obj] then
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return text(tostring(obj), colours.lightGrey)
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elseif getmetatable(obj) ~= nil and getmetatable(obj).__tostring then
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return text(tostring(obj))
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elseif next(obj) == nil then
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return braces
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else
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tracking[obj] = true
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local doc = setmetatable({ tag = "concat", n = 1, space_line }, Doc)
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local length, keys, keysn = #obj, {}, 1
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for k in pairs(obj) do keys[keysn], keysn = k, keysn + 1 end
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table.sort(keys, key_compare)
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for i = 1, keysn - 1 do
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if i > 1 then append(doc, comma) append(doc, space_line) end
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local k = keys[i]
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local v = obj[k]
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local ty = type(k)
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if ty == "number" and k % 1 == 0 and k >= 1 and k <= length then
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append(doc, pretty_impl(v, tracking))
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elseif ty == "string" and not keywords[k] and k:match("^[%a_][%a%d_]*$") then
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append(doc, text(k .. " = "))
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append(doc, pretty_impl(v, tracking))
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else
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append(doc, obracket)
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append(doc, pretty_impl(k, tracking))
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append(doc, cbracket)
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append(doc, pretty_impl(v, tracking))
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end
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end
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tracking[obj] = nil
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return group(concat(obrace, nest(2, concat(table.unpack(doc, 1, n))), space_line, cbrace))
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end
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end
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--- Pretty-print an arbitrary object, converting it into a document.
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--
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-- This can then be rendered with @{write} or @{print}.
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--
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-- @param obj The object to pretty-print.
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-- @treturn Doc The object formatted as a document.
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-- @usage Display a table on the screen
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-- local pretty = require "cc.pretty"
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-- pretty.print(pretty.pretty({ 1, 2, 3 })
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local function pretty(obj)
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return pretty_impl(obj, {})
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end
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return {
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empty = empty,
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space = space,
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line = line,
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space_line = space_line,
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text = text,
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concat = concat,
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nest = nest,
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group = group,
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write = write,
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print = print,
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render = render,
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pretty = pretty,
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}
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@ -6,6 +6,8 @@ if #tArgs > 0 then
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return
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end
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local pretty = require "cc.pretty"
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local bRunning = true
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local tCommandHistory = {}
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local tEnv = {
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@ -87,20 +89,11 @@ while bRunning do
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local n = 1
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while n < tResults.n or n <= nForcePrint do
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local value = tResults[ n + 1 ]
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if type( value ) == "table" then
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local metatable = getmetatable( value )
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if type(metatable) == "table" and type(metatable.__tostring) == "function" then
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print( tostring( value ) )
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else
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local ok, serialised = pcall( textutils.serialise, value )
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if ok then
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print( serialised )
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else
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print( tostring( value ) )
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end
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end
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local ok, serialised = pcall(pretty.pretty, value)
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if ok then
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pretty.print(serialised)
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else
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print( tostring( value ) )
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print(tostring(value))
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end
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n = n + 1
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end
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@ -0,0 +1,208 @@
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local with_window = require "test_helpers".with_window
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describe("cc.pretty", function()
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local pp = require("cc.pretty")
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describe("text", function()
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it("is constant for the empty string", function()
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expect(pp.text("")):eq(pp.empty)
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end)
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||||
|
||||
it("is constant for a space", function()
|
||||
expect(pp.text(" ")):eq(pp.space)
|
||||
end)
|
||||
|
||||
it("is constant for a newline", function()
|
||||
expect(pp.text("\n")):eq(pp.space_line)
|
||||
end)
|
||||
|
||||
it("validates arguments", function()
|
||||
expect.error(pp.text, 123):eq("bad argument #1 (expected string, got number)")
|
||||
expect.error(pp.text, "", ""):eq("bad argument #2 (expected number, got string)")
|
||||
end)
|
||||
|
||||
it("produces text documents", function()
|
||||
expect(pp.text("a")):same({ tag = "text", text = "a" })
|
||||
expect(pp.text("a", colours.grey)):same({ tag = "text", text = "a", colour = colours.grey })
|
||||
end)
|
||||
|
||||
it("splits lines", function()
|
||||
expect(pp.text("a\nb"))
|
||||
:same(pp.concat(pp.text("a"), pp.space_line, pp.text("b")))
|
||||
expect(pp.text("ab\ncd\nef"))
|
||||
:same(pp.concat(pp.text("ab"), pp.space_line, pp.text("cd"), pp.space_line, pp.text("ef")))
|
||||
end)
|
||||
|
||||
it("preserves empty lines", function()
|
||||
expect(pp.text("a\n\nb"))
|
||||
:same(pp.concat(pp.text("a"), pp.space_line, pp.space_line, pp.text("b")))
|
||||
expect(pp.text("\n\nb"))
|
||||
:same(pp.concat(pp.space_line, pp.space_line, pp.text("b")))
|
||||
expect(pp.text("a\n\n"))
|
||||
:same(pp.concat(pp.text("a"), pp.space_line, pp.space_line))
|
||||
end)
|
||||
end)
|
||||
|
||||
describe("concat", function()
|
||||
it("returns empty with 0 arguments", function()
|
||||
expect(pp.concat()):eq(pp.empty)
|
||||
end)
|
||||
|
||||
it("acts as the identity with 1 argument", function()
|
||||
local x = pp.text("test")
|
||||
expect(pp.concat(x)):eq(x)
|
||||
end)
|
||||
|
||||
it("coerces strings", function()
|
||||
expect(pp.concat("a", "b")):same(pp.concat(pp.text("a"), pp.text("b")))
|
||||
end)
|
||||
|
||||
it("validates arguments", function()
|
||||
expect.error(pp.concat, 123):eq("bad argument #1 (expected document, got number)")
|
||||
expect.error(pp.concat, "", {}):eq("bad argument #2 (expected document, got table)")
|
||||
end)
|
||||
|
||||
it("can be used as an operator", function()
|
||||
local a, b = pp.text("a"), pp.text("b")
|
||||
expect(pp.concat(a, b)):same(a .. b)
|
||||
end)
|
||||
end)
|
||||
|
||||
describe("group", function()
|
||||
it("is idempotent", function()
|
||||
local x = pp.group(pp.text("a\nb"))
|
||||
expect(pp.group(x)):eq(x)
|
||||
end)
|
||||
|
||||
it("does nothing for flat strings", function()
|
||||
local x = pp.text("a")
|
||||
expect(pp.group(x)):eq(x)
|
||||
end)
|
||||
end)
|
||||
|
||||
-- Allows us to test
|
||||
local function test_output(display)
|
||||
it("displays the empty document", function()
|
||||
expect(display(pp.empty)):same { "" }
|
||||
end)
|
||||
|
||||
it("displays a multiline string", function()
|
||||
expect(display(pp.text("hello\nworld"))):same {
|
||||
"hello",
|
||||
"world",
|
||||
}
|
||||
end)
|
||||
|
||||
it("displays a nested string", function()
|
||||
expect(display(pp.nest(2, pp.concat("hello", pp.line, "world")))):same {
|
||||
"hello",
|
||||
" world",
|
||||
}
|
||||
end)
|
||||
|
||||
it("displays a flattened group", function()
|
||||
expect(display(pp.group(pp.concat("hello", pp.space_line, "world")))):same {
|
||||
"hello world",
|
||||
}
|
||||
|
||||
expect(display(pp.group(pp.concat("hello", pp.line, "world")))):same {
|
||||
"helloworld",
|
||||
}
|
||||
end)
|
||||
|
||||
it("displays an expanded group", function()
|
||||
expect(display(pp.group(pp.concat("hello darkness", pp.space_line, "my old friend")))):same {
|
||||
"hello darkness",
|
||||
"my old friend",
|
||||
}
|
||||
end)
|
||||
|
||||
it("group removes nest", function()
|
||||
expect(display(pp.group(pp.nest(2, pp.concat("hello", pp.space_line, "world"))))):same {
|
||||
"hello world",
|
||||
}
|
||||
end)
|
||||
end
|
||||
|
||||
describe("write", function()
|
||||
local function display(doc)
|
||||
local w = with_window(20, 10, function() pp.write(doc) end)
|
||||
local _, y = w.getCursorPos()
|
||||
|
||||
local out = {}
|
||||
for i = 1, y do out[i] = w.getLine(i):gsub("%s+$", "") end
|
||||
return out
|
||||
end
|
||||
|
||||
test_output(display)
|
||||
|
||||
it("wraps a long string", function()
|
||||
expect(display(pp.text("hello world this is a long string which will wrap"))):same {
|
||||
"hello world this is",
|
||||
"a long string which",
|
||||
"will wrap",
|
||||
}
|
||||
end)
|
||||
end)
|
||||
|
||||
describe("render", function()
|
||||
local function display(doc)
|
||||
local rendered = pp.render(doc, 20)
|
||||
local n, lines = 1, {}
|
||||
for line in (rendered .. "\n"):gmatch("([^\n]*)\n") do lines[n], n = line, n + 1 end
|
||||
return lines
|
||||
end
|
||||
|
||||
test_output(display)
|
||||
|
||||
it("does not wrap a long string", function()
|
||||
expect(display(pp.text("hello world this is a long string which will wrap"))):same {
|
||||
"hello world this is a long string which will wrap",
|
||||
}
|
||||
end)
|
||||
end)
|
||||
|
||||
describe("pretty", function()
|
||||
--- We make use of "render" here, as it's considerably easier than checking against the actual structure.
|
||||
-- However, it does also mean our tests are less unit-like.
|
||||
local function pretty(x, width) return pp.render(pp.pretty(x), width) end
|
||||
|
||||
describe("tables", function()
|
||||
it("displays empty tables", function()
|
||||
expect(pp.pretty({})):same(pp.text("{}"))
|
||||
end)
|
||||
|
||||
it("displays list-like tables", function()
|
||||
expect(pretty({ 1, 2, 3 })):eq("{ 1, 2, 3 }")
|
||||
end)
|
||||
|
||||
it("displays mixed tables", function()
|
||||
expect(pretty({ n = 3, 1, 2, 3 })):eq("{ n = 3, 1, 2, 3 }")
|
||||
end)
|
||||
|
||||
it("escapes keys", function()
|
||||
expect(pretty({ ["and"] = 1, ["not that"] = 2 })):eq('{ ["and"] = 1, ["not that"] = 2 }')
|
||||
end)
|
||||
|
||||
it("sorts keys", function()
|
||||
expect(pretty({ c = 1, b = 2, a = 3 })):eq('{ a = 3, b = 2, c = 1 }')
|
||||
end)
|
||||
|
||||
it("groups tables", function()
|
||||
expect(pretty({ 1, 2, 3 }, 4)):eq("{\n 1,\n 2,\n 3\n}")
|
||||
end)
|
||||
end)
|
||||
|
||||
it("shows numbers", function()
|
||||
expect(pretty(123)):eq("123")
|
||||
end)
|
||||
|
||||
it("shows strings", function()
|
||||
expect(pretty("hello\nworld")):eq('"hello\\nworld"')
|
||||
end)
|
||||
|
||||
it("shows functions", function()
|
||||
expect(pretty(pretty)):eq(tostring(pretty))
|
||||
end)
|
||||
end)
|
||||
end)
|
||||
Loading…
Reference in New Issue