45 lines
1.6 KiB
Plaintext
45 lines
1.6 KiB
Plaintext
-- This file contains the datastructures used to represent parsed Nomsu syntax trees,
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-- as well as the logic for converting them to Lua code.
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{:repr} = require 'utils'
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{:insert, :remove, :concat} = table
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{:Source} = require "code_obj"
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AST = {}
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AST.is_syntax_tree = (n)->
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type(n) == 'table' and getmetatable(n) and AST[n.type] == getmetatable(n)
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types = {"Number", "Var", "Block", "EscapedNomsu", "Text", "List", "Dict", "DictEntry",
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"IndexChain", "Action"}
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for name in *types
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cls = {}
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with cls
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.__class = cls
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.__index = cls
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.__name = name
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.type = name
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.is_instance = (x)=> getmetatable(x) == @
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.__tostring = => "#{@name}(#{concat([repr(v) for v in *@], ', ')})"
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.map = (fn)=>
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if replacement = fn(@) then return replacement
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replacements = [AST.is_syntax_tree(v) and v\map(fn) or nil for v in *@]
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return @ unless next(replacements)
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return (@__class)(@source, unpack([replacements[i] or v for i,v in ipairs(@)]))
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AST[name] = setmetatable cls,
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__tostring: => @name
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__call: (source, ...)=>
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if type(source) == 'string'
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source = Source\from_string(source)
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for i=1,select('#', ...) do assert(select(i,...))
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assert(Source\is_instance(source))
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inst = {:source, ...}
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setmetatable(inst, @)
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if inst.__init then inst\__init!
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return inst
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AST.Action.__init = =>
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stub_bits = [type(a) == 'string' and a or '%' for a in *@]
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@stub = concat stub_bits, " "
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return AST
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