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{:insert, :remove, :concat} = table
immutable = require 'immutable'
local Lua, LuaValue, Location
Location = immutable {"text_name","text","start","stop"}, {
__new: (text_name, text, start, stop)-> text_name, text, start, stop or start
__tostring: "#{text_name}[#{start}:#{stop}]"
__lt: (other)=>
assert(@text == other.text, "Cannot compare sources from different texts")
return if @start == other.start
@stop < other.stop
else @start < other.start
__le: (other)=>
assert(@text == other.text, "Cannot compare sources from different texts")
return if @start == other.start
@stop <= other.stop
else @start <= other.start
get_text: => @text\sub(@start,@stop)
get_line_number: =>
-- TODO: do a binary search if this is actually slow, which I doubt
line_starts = LINE_STARTS[@text]
start_line = 1
while start_line < #line_starts and line_starts[start_line+1] <= @start
start_line += 1
stop_line = start_line
while stop_line < #line_starts and line_starts[stop_line+1] <= @stop
stop_line += 1
return start_line, stop_line
get_line: => "#{@text_name}:#{@get_line_number}"
get_line_range: =>
start_line, stop_line = @get_line_number
return if stop_line == start_line
"#{text_name}:#{start_line}"
else "#{text_name}:#{start_line}-#{stop_line}"
}
class Lua
is_statement: true
is_value: false
__new: (@source, ...)=>
@bits = {...}
@free_vars = {}
add_free_vars: (free_vars)=>
seen = {[v]:true for v in *@free_vars}
for var in *free_vars
unless seen[var]
@free_vars[#@free_vars+1] = var
seen[var] = true
as_statements: => self
declare_locals: (skip={})=>
if next(skip) == 1
skip = {[s]:true for s in *skip}
@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 b in *@bits
if type(b) == 'string'
buff[#buff+1] = b
else
for sub in *b\render!
buff[#buff+1] = sub
return concat(buff, "")
__len: =>
len = 0
for b in *@bits
len += #b
return len
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, ...)
make_offset_table: (lua_chunkname)=>
-- Return a mapping from output (lua) character number to input (nomsu) character number
lua_str = tostring(self)
metadata = {
nomsu_filename:@source.text_name, nomsu_file:@source.text,
lua_filename:lua_chunkname, lua_file:lua_str
lua_to_nomsu: {}, nomsu_to_lua: {}
}
metadata, lua_offset = {}, 1
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.souce, Location(lua_chunkname, lua_str, 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
class LuaValue extends Lua
is_statement: false
is_value: true
__new: (@source, ...)=>
@bits = {...}
as_statements: =>
bits = {unpack @bits}
bits[#bits+1] = ";"
return Lua(@source, bits)
parenthesize: =>
@prepend "("
@append ")"
return {:Lua, :LuaValue}
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