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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.
use "lib/object.nom"
object (Hole):
action [Hole from %lua]:
return (Hole {lua:%lua})
my action [as lua]:
return %me.lua
my action [as nomsu]:
return "(Hole {lua:\(%me.lua)})"
my action [as text]:
barf "Not implemented"
my action [as smext]:
barf "Must fill in holes before smexting"
object (Code):
my action [set up]:
assume %me.source
%old_bits = (%me.bits if (%me.bits is a "List") else [%me.bits])
%me.bits = []
if (%me.source is text):
%me.source = (Source from text %me.source)
for % in %old_bits:
%me::add %
my action [as text]:
barf "Not implemented"
my action [as smext]:
if (%me.__str == (nil)):
set {%buff:[], %indent:0}
for %bit in %me.bits:
if (%bit is text):
%spaces = (%bit::matching "\n([ ]*)[^\n]*$")
if %spaces: %indent = (size of %spaces.1)
..else:
%bit = (%bit::as smext)
if (%indent > 0):
%bit = (%bit::with "\n" -> "\n\(" "::* %indent)")
%buff::add %bit
%me.__str = (%buff::joined)
return %me.__str
my action [as lua]:
barf
return "\(%me.class.name::as lua id)_from_1_2(\((%me.source::as lua) if %me.source else "nil"), \(%me.bits::as lua))"
my action [as nomsu] (..)
"(\(%me.class.name) \((%me.source::as nomsu) if %me.source else "(nil)") \(%me.bits::as nomsu))"
my action [size] (size of (%me::as smext))
my action [mark as dirty]:
%me.__str = (nil)
%me._trailing_line_len = (nil)
%me._num_lines = (nil)
my action [add %new_bits]:
unless (%new_bits is a "List"):
%new_bits = [%new_bits]
for % in %new_bits:
if (% == ""): do next %
#if ((% isn't text) and (% isn't a (Code))):
% = (%::as lua)
%me.bits::add %
%me::mark as dirty
my action [trailing line length]:
if (%me._trailing_line_len == (nil)):
%me._trailing_line_len = (size of ((%me::as smext)::matching "[^\n]*$"))
return %me._trailing_line_len
my action [number of lines]:
unless %me._num_lines:
%num_lines = 1
for % in %me:
if (% is text):
%num_lines += (size of (%::all matches of "\n"))
..else:
%num_lines += ((%::number of lines) - 1)
%me._num_lines = %num_lines
return %me._num_lines
my action [is multiline, is multi-line] ((%me::number of lines) > 1)
my action [is one line, is single line] ((%me::number of lines) == 1)
my action [add %values joined with %joiner]:
%me::add %values joined with %joiner or %joiner
my action [add %values joined with %joiner or %wrapping_joiner]:
%line_len = 0
%bits = %me.bits
for %value in %values at %i:
if (%i > 1):
if (%line_len > 80):
%bits::add %wrapping_joiner
%line_len = 0
..else:
%bits::add %joiner
%bits::add %value
unless (%value is text):
%value = (%value::as smext)
%line = (%value::matching "\n([^\n]*)$")
if %line:
%line_len = (size of %line)
..else:
%line_len += (size of %value)
%me::mark as dirty
my action [prepend %]:
#if ((% isn't text) and (% isn't a %me.__type)):
% = (%::as lua)
%me.bits::add % at index 1
%me::mark as dirty
my action [parenthesize]:
%me.bits::add "(" at index 1
%me.bits::add ")"
%me::mark as dirty
object (Lua Code) extends (Code):
my action [add free vars %vars]:
if ((size of %vars) == 0): return
%seen = (%v = (yes) for %v in %me.free_vars)
for %var in %vars:
assume (%var is text)
unless %seen.%var:
%me.free_vars::add %var
%seen.%var = (yes)
%me::mark as dirty
my action [remove free vars %vars]:
if ((size of %vars) == 0): return
%removals = {}
for %var in %vars:
assume (%var is text)
%removals.%var = (yes)
%stack = [%me]
repeat while ((size of %stack) > 0):
%lua = (%stack::pop)
for %i in (size of %lua.free_vars) to 1 by -1:
if %removals.(%lua.free_vars.%i):
lua> "table.remove(\%lua.free_vars, \%i)"
#TODO: reinstate this
#%lua.free_vars::remove at index %i
for % in %lua.bits:
unless (% is text):
%stack::add %
%me::mark as dirty
my action [declare locals] (%me::declare locals (nil))
my action [declare locals %to_declare]:
unless %to_declare:
set {%to_declare:[], %seen:{}}
for %lua in recursive %me:
for %var in %lua.free_vars:
unless %seen.%var:
%seen.%var = (yes)
%to_declare::add %var
for % in %lua.bits:
unless (% is text):
recurse %lua on %
if ((size of %to_declare) > 0):
%me::remove free vars %to_declare
%me::prepend "local \(%to_declare::joined with ", ");\n"
return %to_declare
my action [as statements] (%me::as statements "" ";")
my action [as statements %prefix] (%me::as statements %prefix ";")
my action [as statements %prefix %suffix]:
unless %me.is_value:
return %me
%statements = (Lua Code from %me.source [])
if ((%prefix or "") != ""):
%statements::add %prefix
%statements::add %me
if (%suffix != ""):
%statements::add (%suffix or ";")
return %statements
my action [variables]:
%vars = []
for %code in recursive %me:
if %code.is_variable:
%vars::add (%code::as smext)
for % in %code.bits:
unless (% is text):
recurse %code on %
return %vars
action [Lua Code from %source %bits]:
assume %source
unless (%bits is a "List"): %bits = [%bits]
if (%source is a "Syntax Tree"): %source = %source.source
return (..)
Lua Code {source:%source, bits:%bits, is_value: no, free_vars:[]}
action [Lua Code from %source] (Lua Code from %source [])
action [Lua Value from %source %bits]:
assume %source
unless (%bits is a "List"): %bits = [%bits]
if (%source is a "Syntax Tree"): %source = %source.source
return (..)
Lua Code {source:%source, bits:%bits, is_value: yes, free_vars:[]}
action [Lua Value from %source] (Lua Value from %source [])
action [Lua Variable from %source] (Lua Variable from %source [])
action [Lua Variable from %source %bits]:
assume %source
unless (%bits is a "List"): %bits = [%bits]
if (%source is a "Syntax Tree"): %source = %source.source
return (..)
Lua Code {source:%source, bits:%bits, is_value: yes, is_variable: yes, free_vars:[]}
# TODO: remove this shim
(Lua Code).add_free_vars = (Lua Code).add_free_vars_1
(Lua Code).remove_free_vars = (Lua Code).remove_free_vars_1
(Lua Code).declare_locals = (Lua Code).declare_locals_1
(Lua Code).as_statements = (Lua Code).as_statements_1_2
object (Nomsu Code) extends (Code):
action [Nomsu Code from %source %bits]:
if (%bits is text): %bits = [%bits]
if (%source is a "Syntax Tree"): %source = %source.source
return (..)
Nomsu Code {source:%source, bits:%bits}
action [Nomsu Code from %source] (Nomsu Code from %source [])
action [Nomsu Code %bits] (Nomsu Code from (nil) %bits)
action [Nomsu Code] (Nomsu Code from (nil) [])
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