64 lines
2.0 KiB
Plaintext
64 lines
2.0 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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-- Helper method:
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Tree = (name, methods)->
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cls = methods or {}
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with cls
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.type = name
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.__class = cls
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.__name = name
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.is_instance = (x)=> getmetatable(x) == @
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.__index = cls
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.__tostring = => "#{@name}(#{table.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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made_changes, new_vals = false, {}
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for i,v in ipairs @
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if AST.is_syntax_tree(v)
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if replacement = v\map(fn)
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if replacement ~= v
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made_changes = true
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v = replacement
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new_vals[i] = v
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return @ unless made_changes
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replacement = getmetatable(self)(@source, unpack(new_vals))
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return replacement
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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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Tree "Number"
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Tree "Var"
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Tree "Block"
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Tree "EscapedNomsu"
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Tree "Text"
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Tree "List"
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Tree "Dict"
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Tree "DictEntry"
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Tree "IndexChain"
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Tree "Action",
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__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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get_spec: =>
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concat [type(a) == "string" and a or "%#{a[1]}" for a in *@], " "
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return AST
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