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-- This file contains objects that are used to track code positions and incrementally
-- build up generated code, while keeping track of where it came from, and managing
-- indentation levels.
{:insert, :remove, :concat} = table
local Lua, Source
export LINE_STARTS
class Source
new: (@filename, @start, @stop)=>
@from_string: (str)=>
filename,start,stop = str\match("^@(.-)%[(%d+):(%d+)%]$")
unless filename
filename,start = str\match("^@(.-)%[(%d+)%]$")
return @(filename or str, tonumber(start or 1), tonumber(stop))
@is_instance: (x)=> type(x) == 'table' and x.__class == @
__tostring: =>
if @stop
"@#{@filename}[#{@start}:#{@stop}]"
else
"@#{@filename}[#{@start}]"
__eq: (other)=>
getmetatable(@) == getmetatable(other) and @filename == other.filename and @start == other.start and @stop == other.stop
__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 if type(offset) != 'number' then error("Cannot add Source and #{type(offset)}")
return Source(@filename, @start+offset, @stop)
class Code
new: (@source, ...)=>
@bits, @indents, @current_indent = {}, {}, 0
@append(...)
if type(@source) == 'string'
@source = Source\from_string(@source)
assert(@source and Source\is_instance(@source))
append: (...)=>
n = select("#",...)
bits, indents = @bits, @indents
match = string.match
for i=1,n
b = select(i, ...)
bits[#bits+1] = b
if type(b) == 'string'
if spaces = match(b, "\n([ ]*)[^\n]*$")
@current_indent = #spaces
elseif @current_indent != 0
indents[#bits] = @current_indent
@__str = nil
prepend: (...)=>
n = select("#",...)
bits, indents = @bits, @indents
for i=#bits+n,n+1,-1
bits[i] = bits[i-n]
for i=1,n
bits[i] = select(i, ...)
@current_indent = 0
for i,b in ipairs(bits)
if type(b) == 'string'
if spaces = b\match("\n([ ]*)[^\n]*$")
@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(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(var.type == "Var")
removals[var[1]] = 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][1]]
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 [string.as_lua_id(v[1]) 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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