71 lines
2.6 KiB
Plaintext
71 lines
2.6 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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unpack or= table.unpack
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AST = {}
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AST.is_syntax_tree = (n, t=nil)->
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type(n) == 'table' and getmetatable(n) and AST[n.type] == getmetatable(n) and (t == nil or n.type == t)
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types = {"Number", "Var", "Block", "EscapedNomsu", "Text", "List", "Dict", "DictEntry",
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"IndexChain", "Action", "FileChunks"}
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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 = =>
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args = {tostring(@source), unpack(@)}
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"#{@type}(#{concat([repr(v) for v in *args], ', ')})"
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.map = (fn)=>
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replacement = fn(@)
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if replacement == false then return nil
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if replacement
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-- Clone the replacement, but give it a proper source
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replacement = (replacement.__class)(@source, unpack(replacement))
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else
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replacements = {}
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changes = false
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for i,v in ipairs(@)
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replacements[#replacements+1] = v
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if AST.is_syntax_tree(v)
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r = v\map(fn)
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continue if r == v or r == nil
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changes = true
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replacements[#replacements] = r
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return @ unless changes
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replacement = (@__class)(@source, unpack(replacements))
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replacement.comments = [c for c in *@comments] if @comments
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return replacement
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.__eq = (other)=>
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return false if type(@) != type(other) or #@ != #other or getmetatable(@) != getmetatable(other)
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for i=1,#@
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return false if @[i] != other[i]
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return true
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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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AST.Action.get_args = =>
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[tok for tok in *@ when type(tok) != 'string']
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return AST
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