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