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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 not start
start, stop = 1, #FILE_CACHE[filename]
if stop then assert(start <= stop+1, "Invalid range: #{start}, #{stop}")
return filename, start, stop
__tostring: =>
if @stop
"\"#{@filename}[#{@start}:#{@stop}]\""
else
"\"#{@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)=>
start or= 1
assert(start > 0 and (stop == nil or stop > 0), "Negative subscripts not supported")
if not @stop
assert(not stop, "cannot subscript non-range with range")
return Source(@filename, @start + start - 1)
else
stop or= @stop
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, ...)=>
@bits, @indents, @current_indent = {}, {}, 0
@append(...)
if type(@source) == 'string'
filename,start,stop = @source\match("^(.-)%[(%d+):(%d+)%]$")
unless filename
filename,start = @source\match("^(.-)%[(%d+)%]$")
if start or stop
@source = Source(filename, tonumber(start), tonumber(stop))
else
@source = Source(@source, 1, #tostring(self)+1)
assert(@source)
sub: (start,stop)=>
-- TODO: implement this better
str = tostring(self)\sub(start,stop)
cls = @__class
return cls(@source\sub(start,stop), str)
append: (...)=>
n = select("#",...)
bits, indents = @bits, @indents
match = string.match
for i=1,n
b = select(i, ...)
assert(b != self, "No recursion please.")
assert(not Source\is_instance(b))
bits[#bits+1] = b
if type(b) == 'string'
if spaces = match(b, "\n([ ]*)[^\n]*$")
@current_indent = #spaces
elseif @current_indent != 0
indents[#bits] = @current_indent
@__str = nil
prepend: (...)=>
n = select("#",...)
bits, indents = @bits, @indents
for i=#bits+n,n+1,-1
bits[i] = bits[i-n]
for i=1,n
bits[i] = select(i, ...)
@current_indent = 0
for i,b in ipairs(bits)
assert(b != self, "No recursion please.")
if type(b) == 'string'
if spaces = b\match("\n([ ]*)[^\n]*$")
@current_indent = #spaces
elseif @current_indent != 0
indents[i] = @current_indent
else indents[i] = nil
@__str = nil
class Lua extends Code
new: (...)=>
super ...
@free_vars = {}
@is_value = false
@__str = nil
@Value = (...)->
lua = Lua(...)
lua.is_value = true
return lua
add_free_vars: (vars)=>
return unless #vars > 0
seen = {[v]:true for v in *@free_vars}
for var in *vars
assert(type(var) == 'userdata' and var.type == "Var")
unless seen[var]
@free_vars[#@free_vars+1] = var
seen[var] = true
@__str = nil
remove_free_vars: (vars)=>
return unless #vars > 0
removals = {}
for var in *vars
assert(type(var) == 'userdata' and var.type == "Var")
removals[var.value] = true
stack = {self}
while #stack > 0
lua, stack[#stack] = stack[#stack], nil
for i=#lua.free_vars,1,-1
if removals[lua.free_vars[i].value]
remove lua.free_vars, i
for b in *lua.bits
if type(b) != 'string'
stack[#stack+1] = b
@__str = nil
as_statements: (prefix="", suffix=";")=>
unless @is_value
return self
statements = Lua(@source)
if prefix != ""
statements\append prefix
statements\append self
if suffix != ""
statements\append suffix
return statements
declare_locals: (to_declare=nil)=>
if to_declare == nil
to_declare, seen = {}, {}
gather_from = =>
for var in *@free_vars
unless seen[var]
seen[var] = true
to_declare[#to_declare+1] = var
for bit in *@bits
if bit.__class == Lua
gather_from bit
gather_from self
if #to_declare > 0
@remove_free_vars to_declare
@prepend "local #{concat [v\as_lua_id! for v in *to_declare], ", "};\n"
return to_declare
__tostring: =>
if @__str == nil
buff, indents = {}, @indents
for i,b in ipairs @bits
b = tostring(b)
if indents[i]
b = b\gsub("\n", "\n"..((" ")\rep(indents[i])))
buff[#buff+1] = b
@__str = concat(buff, "")
return @__str
__len: =>
#tostring(self)
make_offset_table: =>
-- Return a mapping from output (lua) character number to input (nomsu) character number
lua_to_nomsu, nomsu_to_lua = {}, {}
walk = (lua, pos)->
for b in *lua.bits
if type(b) == 'string'
if lua.source
lua_to_nomsu[pos] = lua.source.start
nomsu_to_lua[lua.source.start] = pos
else
walk b, pos
pos += #tostring(b)
walk self, 1
return {
nomsu_filename:@source.filename
lua_filename:tostring(@source)..".lua", lua_file:@stringify!
:lua_to_nomsu, :nomsu_to_lua
}
parenthesize: =>
if @is_value
@prepend "("
@append ")"
else
error "Cannot parenthesize lua statements"
class Nomsu extends Code
__tostring: =>
if @__str == nil
buff, indents = {}, @indents
for i,b in ipairs @bits
b = tostring(b)
if indents[i]
b = b\gsub("\n", "\n"..((" ")\rep(indents[i])))
buff[#buff+1] = b
@__str = concat(buff, "")
return @__str
__len: =>
#tostring(self)
parenthesize: =>
@prepend "("
@append ")"
return {:Code, :Nomsu, :Lua, :Source}
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