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{:insert, :remove, :concat} = table
immutable = require 'immutable'
local Lua, Source
export LINE_STARTS
Source = immutable {"filename","start","stop"}, {
name:"Source"
__new: (filename, start, stop)=>
if stop then assert(start <= stop, "Invalid range: #{start}, #{stop}")
return filename, start, stop
__tostring: =>
if @stop
"Source(\"#{@filename}\", #{@start}, #{@stop})"
else
"Source(\"#{@filename}\", #{@start})"
__lt: (other)=>
assert(@filename == other.filename, "Cannot compare sources from different files")
return if @start == other.start
(@stop or @start) < (other.stop or other.start)
else @start < other.start
__le: (other)=>
assert(@filename == other.filename, "Cannot compare sources from different files")
return if @start == other.start
(@stop or @start) <= (other.stop or other.start)
else @start <= other.start
__add: (offset)=>
if type(self) == 'number'
offset, self = self, offset
else assert(type(offset) == 'number', "Cannot add Source and #{type(offset)}")
return Source(@filename, @start+offset, @stop)
sub: (start, stop)=>
if not @stop
assert(not stop, "cannot subscript non-range with range")
assert(start > 0, "cannot subscript non-range with negative index")
return Source(@filename, @start + (start or 0))
else
start or= 1
if start < 0 then start = @stop + start + 1
stop or= -1
if stop < 0 then stop = @stop + stop + 1
return Source(@filename, @start + start - 1, @start + stop - 1)
get_text: =>
FILE_CACHE[@filename]\sub(@start,@stop)
get_line_number: =>
-- TODO: do a binary search if this is actually slow, which I doubt
src = FILE_CACHE[@filename]
line_starts = LINE_STARTS[src]
start_line = 1
while (line_starts[start_line+1] or math.huge) <= @start
start_line += 1
stop_line = start_line
while (line_starts[stop_line+1] or math.huge) <= @stop
stop_line += 1
return start_line, stop_line
get_line: => "#{@filename}:#{@get_line_number!}"
get_line_range: =>
start_line, stop_line = @get_line_number!
return if stop_line == start_line
"#{@filename}:#{start_line}"
else "#{@filename}:#{start_line}-#{stop_line}"
}
class Code
new: (@source, ...)=>
if type(@source) == 'string'
filename,start,stop = @source\match("^(.-)[(%d+):(%d+)]$")
@source = Source(filename, tonumber(start), tonumber(stop))
@bits = {...}
clone: =>
cls = @__class
copy = cls(@source, unpack(@bits))
copy.is_value = @is_value
for k,v in pairs @free_vars
copy.free_vars[k] = v
return copy
__tostring: =>
buff = {}
for i,b in ipairs @bits
buff[#buff+1] = tostring(b)
ret = concat(buff, "")
return ret
__len: =>
len = 0
for b in *@bits
len += #b
return len
sub: (start,stop)=>
str = tostring(self)\sub(start,stop)
cls = @__class
return cls(@source\sub(start-@source.start+1,stop-@source.stop+1), str)
append: (...)=>
n = select("#",...)
bits = @bits
for i=1,n
bits[#bits+1] = select(i, ...)
prepend: (...)=>
n = select("#",...)
bits = @bits
for i=#bits+n,n+1,-1
bits[i] = bits[i-n]
for i=1,n
bits[i] = select(i, ...)
class Lua extends Code
new: (...)=>
super ...
@free_vars = {}
@is_value = false
@Value = (...)->
lua = Lua(...)
lua.is_value = true
return lua
add_free_vars: (...)=>
seen = {[v]:true for v in *@free_vars}
for i=1,select("#",...)
var = select(i, ...)
unless seen[var]
@free_vars[#@free_vars+1] = var
seen[var] = true
convert_to_statements: (prefix="", suffix=";")=>
unless @is_value
return
if prefix != ""
@prepend prefix
if suffix != ""
@append suffix
declare_locals: (skip={})=>
if next(skip) == 1
skip = {[s]:true for s in *skip}
if #@free_vars > 0
@prepend "local #{concat @free_vars, ", "};\n"
for var in *@free_vars do skip[var] = true
for bit in *@bits
if type(bit) == Lua
bit\declare_locals(skip)
__tostring: =>
buff = {}
for i,b in ipairs @bits
buff[#buff+1] = tostring(b)
ret = concat(buff, "")
return ret
__len: =>
len = 0
for b in *@bits
len += #b
return len
append: (...)=>
n = select("#",...)
bits = @bits
for i=1,n
bit = select(i, ...)
bits[#bits+1] = bit
if type(bit) != 'string' and not bit.is_value and #@bits > 0
bits[#bits+1] = "\n"
prepend: (...)=>
n = select("#",...)
bits = @bits
insert_index = 1
-- TODO: optimize?
for i=1,n
bit = select(i, ...)
insert bits, insert_index, bit
insert_index += 1
if type(bit) != 'string' and not bit.is_value and insert_index < #@bits + 1
insert bits, insert_index, "\n"
insert_index += 1
make_offset_table: =>
-- Return a mapping from output (lua) character number to input (nomsu) character number
lua_chunkname = tostring(@source)..".lua"
lua_str = tostring(self)
metadata = {
nomsu_filename:@source.filename
lua_filename:lua_chunkname, lua_file:lua_str
lua_to_nomsu: {}, nomsu_to_lua: {}
}
lua_offset = 1
walk = (lua)->
if type(lua) == 'string'
lua_offset += #lua
else
lua_start = lua_offset
for b in *lua.bits
walk b
lua_stop = lua_offset
nomsu_src, lua_src = lua.source, Source(lua_chunkname, lua_start, lua_stop)
metadata.lua_to_nomsu[lua_src] = nomsu_src
metadata.nomsu_to_lua[nomsu_src] = lua_src
walk self
return lua_str, metadata
parenthesize: =>
if @is_value
@prepend "("
@append ")"
else
error "Cannot parenthesize lua statements"
class Nomsu extends Code
__tostring: =>
buff = {}
for i,b in ipairs @bits
buff[#buff+1] = tostring(b)
ret = concat(buff, "")
return ret
__len: =>
len = 0
for b in *@bits
len += #b
return len
return {:Code, :Nomsu, :Lua, :Source}
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