629 lines
24 KiB
Plaintext
Executable File
629 lines
24 KiB
Plaintext
Executable File
#!/usr/bin/env moon
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re = require 're'
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lpeg = require 'lpeg'
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utils = require 'utils'
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repr = utils.repr
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{:insert, :remove, :concat} = table
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pcall = (fn,...)-> true, fn(...)
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-- TODO:
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-- improve indentation of generated lua code
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-- provide way to run precompiled nomsu -> lua code
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-- better scoping?
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-- first-class rules
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-- better error reporting
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-- add line numbers of function calls
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-- versions of rules with auto-supplied arguments
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-- type checking?
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INDENT = " "
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lpeg.setmaxstack 10000 -- whoa
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{:P,:V,:S,:Cg,:C,:Cp,:B,:Cmt} = lpeg
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STRING_ESCAPES = n:"\n", t:"\t", b:"\b", a:"\a", v:"\v", f:"\f", r:"\r"
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-- Helper "classes"
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parsetree_mt = {__tostring:=> "#{@type}(#{repr(@value)})"}
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ParseTree = (x)-> setmetatable(x, parsetree_mt)
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functiondef_mt = {__tostring:=> "FunctionDef(#{repr(@aliases)}"}
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FunctionDef = (fn, aliases, src, is_macro)->
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setmetatable({:fn, :aliases, :src, :is_macro}, functiondef_mt)
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-- NOTE: this treats tabs as equivalent to 1 space
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indent_stack = {0}
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check_indent = (subject,end_pos,spaces)->
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if #spaces > indent_stack[#indent_stack]
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insert(indent_stack, #spaces)
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return end_pos
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check_dedent = (subject,end_pos,spaces)->
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if #spaces < indent_stack[#indent_stack]
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remove(indent_stack)
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return end_pos
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check_nodent = (subject,end_pos,spaces)->
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if #spaces == indent_stack[#indent_stack]
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return end_pos
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nomsu = [=[
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file <- ({ {| shebang? {:body: block :} %nl* (({.+} ("" -> "Unexpected end of file")) => error)? |} }) -> File
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shebang <- "#!" [^%nl]* %nl
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block <- ({ {|
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(ignored_line %nl)*
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line_of_statements (nodent line_of_statements)*
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(%nl ignored_line)* |} }) -> Block
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inline_block <- ({ {| inline_line_of_statements |} }) -> Block
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line_of_statements <- statement (%ws? ";" %ws? statement)*
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inline_line_of_statements <- inline_statement (%ws? ";" %ws? inline_statement)*
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statement <- ({ functioncall / expression }) -> Statement
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inline_statement <- ({ inline_functioncall / expression }) -> Statement
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expression <- (
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longstring / string / number / variable / list / thunk / block_functioncall
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/ ("(" %ws? (inline_thunk / inline_functioncall) %ws? ")"))
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-- Function calls need at least one word in them
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functioncall <- ({ {|
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(expression (dotdot / tok_gap))* word ((dotdot / tok_gap) (expression / word))*
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|} }) -> FunctionCall
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inline_functioncall <- ({ {|
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(expression tok_gap)* word (tok_gap (expression / word))*
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|} }) -> FunctionCall
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block_functioncall <- "(..)" indent
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functioncall
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(dedent / (({.+} ("" -> "Error while parsing block function call")) => error))
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word <- ({ !number {%wordchar (!"'" %wordchar)*} }) -> Word
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thunk <- ({ ":" ((indent block (dedent / (({.+} ("" -> "Error while parsing thunk")) => error)))
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/ (%ws? inline_block)) }) -> Thunk
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inline_thunk <- ({ ":" %ws? inline_block }) -> Thunk
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string <- ({ (!longstring) '"' {(("\" [^%nl]) / [^"%nl])*} '"' }) -> String
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longstring <- ({ '".."' %ws?
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{| (longstring_line (indent
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longstring_line (nodent longstring_line)*
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(dedent / longstring_error))?)
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/(indent
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longstring_line (nodent longstring_line)*
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(dedent / longstring_error)) |} }) -> Longstring
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longstring_line <- "|" {| ({("\\" / (!string_interpolation [^%nl]))+} / string_interpolation)* |}
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longstring_error <- (({.+} ("" -> "Error while parsing Longstring")) => error)
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string_interpolation <- "\" %ws? (((inline_functioncall / expression) dotdot?) / dotdot) %ws? "\"
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number <- ({ {"-"? (([0-9]+ "." [0-9]+) / ("." [0-9]+) / ([0-9]+)) } }) -> Number
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-- Hack to allow %foo's to parse as "%foo" and "'s" separately
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variable <- ({ ("%" {%wordchar (!"'" %wordchar)*}) }) -> Var
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list <- ({ {|
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("[..]" indent
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list_line (nodent list_line)*
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(dedent / (({.+} ("" -> "Error while parsing list")) => error)))
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/("[" %ws? (list_line %ws?)? "]")
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|} }) -> List
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list_line <- list_bit (%ws? "," tok_gap list_bit)* (%ws? ",")?
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list_bit <- inline_functioncall / expression
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block_comment <- "#.." [^%nl]* indent [^%nl]* (%nl ((%ws? (!. / &%nl)) / (!%dedented [^%nl]*)))*
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line_comment <- "#" [^%nl]*
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eol <- %ws? line_comment? (!. / &%nl)
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ignored_line <- (%nodented (block_comment / line_comment)) / (%ws? (!. / &%nl))
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indent <- eol (%nl ignored_line)* %nl %indented
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nodent <- eol (%nl ignored_line)* %nl %nodented
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dedent <- eol (%nl ignored_line)* (((!.) &%dedented) / (&(%nl %dedented)))
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tok_gap <- %ws / %prev_edge / &("[" / [.,:;{("#%'])
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dotdot <- nodent ".." %ws?
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]=]
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whitespace = S(" \t")^1
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defs =
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ws:whitespace, nl: P("\n")
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wordchar: P(1)-S(' \t\n\r%#:;,.{}[]()"\\')
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indented: Cmt(S(" \t")^0 * (#(P(1)-S(" \t\n") + (-P(1)))), check_indent)
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nodented: Cmt(S(" \t")^0 * (#(P(1)-S(" \t\n") + (-P(1)))), check_nodent)
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dedented: Cmt(S(" \t")^0 * (#(P(1)-S(" \t\n") + (-P(1)))), check_dedent)
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prev_edge: B(S(" \t\n.,:;}])\""))
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error: (src,pos,errors,err_msg)->
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line_no = 1
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for _ in src\sub(1,-#errors)\gmatch("\n") do line_no += 1
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err_pos = #src - #errors + 1
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if errors\sub(1,1) == "\n"
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-- Indentation error
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err_pos += #errors\match("[ \t]*", 2)
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start_of_err_line = err_pos
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while src\sub(start_of_err_line, start_of_err_line) != "\n" and start_of_err_line > 1
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start_of_err_line -= 1
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start_of_prev_line = start_of_err_line - 1
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while src\sub(start_of_prev_line, start_of_prev_line) != "\n" and start_of_prev_line > 1
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start_of_prev_line -= 1
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local prev_line,err_line,next_line
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prev_line,err_line,next_line = src\match("([^\n]*)\n([^\n]*)\n([^\n]*)", start_of_prev_line+1)
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pointer = ("-")\rep(err_pos - start_of_err_line + 0) .. "^"
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error("\n#{err_msg or "Parse error"} in #{filename} on line #{line_no}:\n\n#{prev_line}\n#{err_line}\n#{pointer}\n#{next_line}\n")
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setmetatable(defs, {
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__index: (t,key)->
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-- Disabled for performance
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--with t[key] = (src, value, errors)-> ParseTree({type: key, :src, :value, :errors}) do nil
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with t[key] = (src, value, errors)-> {type: key, :src, :value, :errors} do nil
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})
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nomsu = re.compile(nomsu, defs)
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class NomsuCompiler
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new:(parent)=>
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@write = (...)=> io.write(...)
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@defs = setmetatable({}, {__index:parent and parent.defs})
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@callstack = {}
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@debug = false
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@initialize_core!
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@utils = utils
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@repr = (...)=> repr(...)
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@loaded_files = {}
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writeln:(...)=>
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@write(...)
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@write("\n")
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def: (aliases, fn, src, is_macro=false)=>
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if type(aliases) == 'string'
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aliases = @get_aliases aliases
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if @debug
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@writeln "Defining rule: #{repr aliases}"
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fn_def = FunctionDef(fn, {}, src, is_macro)
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@add_aliases aliases, fn_def
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defmacro: (aliases, fn, src)=> @def(aliases, fn, src, true)
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add_aliases: (aliases, fn_def)=>
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first_alias,first_args = next(fn_def.aliases)
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if not first_alias
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first_alias,first_args = next(aliases)
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for alias,args in pairs(aliases)
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if fn_def[alias] then continue
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if @defs[alias] then @remove_alias(alias)
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if alias != first_alias and not utils.equivalent(utils.set(args), utils.set(first_args))
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@error "Conflicting argument names between #{first_alias} and #{alias}"
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fn_def.aliases[alias] = args
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@defs[alias] = fn_def
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remove_alias: (alias)=>
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fn_def = @defs[alias]
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if not fn_def then return
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fn_def.aliases[alias] = nil
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@defs[alias] = nil
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remove_aliases: (aliases)=>
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for alias in pairs(aliases) do @remove_alias(alias)
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get_fn_def: (x)=>
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if not x then @error "Nothing to get function def from"
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aliases = @get_aliases x
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alias,_ = next(aliases)
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return @defs[alias]
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call: (alias,...)=>
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fn_def = @defs[alias]
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if fn_def == nil
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@error "Attempt to call undefined function: #{alias}"
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-- This is a little bit hacky, but having this check is handy for catching mistakes
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if fn_def.is_macro and @callstack[#@callstack] != "__macro__"
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@error "Attempt to call macro at runtime: #{alias}\nThis can be caused by using a macro in a function that is defined before the macro."
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unless @check_permission(fn_def)
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@error "You do not have the authority to call: #{alias}"
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{:fn, :aliases} = fn_def
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args = {name, select(i,...) for i,name in ipairs(aliases[alias])}
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if @debug
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@writeln "Calling #{repr alias} with args: #{repr(args)}"
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insert @callstack, alias
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-- TODO: optimize, but still allow multiple return values?
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rets = {fn(self,args)}
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remove @callstack
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return unpack(rets)
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run_macro: (tree, kind="Expression")=>
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args = [a for a in *tree.value when a.type != "Word"]
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alias,_ = @get_alias tree
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insert @callstack, "__macro__"
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ret, manual_mode = @call(alias, unpack(args))
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remove @callstack
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if not ret
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@error("No return value for macro: #{name}")
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if kind == "Statement" and not manual_mode
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if ret\match("^do\n")
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error "Attempting to use macro return value as an expression, when it looks like a block:\n#{ret}"
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ret = "ret = "..ret
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return ret
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check_permission: (fn_def)=>
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if getmetatable(fn_def) != functiondef_mt
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fn_name = fn_def
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fn_def = @defs[fn_name]
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if fn_def == nil
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@error "Undefined function: #{fn_name}"
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whiteset = fn_def.whiteset
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if whiteset == nil then return true
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-- TODO: maybe optimize this by making the callstack a Counter and using a
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-- move-to-front optimization on the whitelist to check most likely candidates sooner
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for caller in *@callstack
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if whiteset[caller] then return true
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return false
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parse: (str, filename)=>
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if @debug
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@writeln("PARSING:\n#{str}")
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str = str\gsub("\r","").."\n"
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export indent_stack
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old_indent_stack, indent_stack = indent_stack, {0}
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tree = nomsu\match(str)
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indent_stack = old_indent_stack -- Put it back, just in case.
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if @debug
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@writeln("\nPARSE TREE:")
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@print_tree(tree)
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assert tree, "Failed to parse: #{str}"
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return tree
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tree_to_value: (tree, vars)=>
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code = "
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return (function(compiler, vars)\nreturn #{@tree_to_lua(tree)}\nend)"
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lua_thunk, err = load(code)
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if not lua_thunk
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error("Failed to compile generated code:\n#{code}\n\n#{err}")
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return (lua_thunk!)(self, vars or {})
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tree_to_lua: (tree)=>
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assert tree, "No tree provided."
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if not tree.type
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@error "Invalid tree: #{repr(tree)}"
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switch tree.type
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when "File"
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buffer = {[[return (function(compiler, vars)
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local ret]]}
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vars = {}
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for statement in *tree.value.body.value
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ok,code = pcall(@tree_to_lua, self, statement)
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if not ok
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@writeln "Error occurred in statement:\n#{statement.src}"
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error(code)
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-- Run the fuckers as we go
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lua_code = "
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return (function(compiler, vars)\n#{code}\nend)"
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lua_thunk, err = load(lua_code)
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if not lua_thunk
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error("Failed to compile generated code:\n#{code}\n\n#{err}\n\nProduced by statement:\n#{repr(statement)}")
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value = lua_thunk!
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ok,return_value = pcall(value, self, vars)
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if not ok
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@writeln "Error occurred in statement:\n#{statement.src}"
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error(return_value)
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insert buffer, code
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insert buffer, [[
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return ret
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end)
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]]
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return concat(buffer, "\n"), return_value
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when "Block"
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buffer = {}
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for statement in *tree.value
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insert buffer, @tree_to_lua(statement)
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return concat(buffer, "\n")
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when "Thunk"
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assert tree.value.type == "Block", "Non-block value in Thunk"
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lua = @tree_to_lua(tree.value)
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if #tree.value.value == 1
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if ret_value = lua\match("^%s*ret = (.*)")
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return ([[
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(function(compiler, vars)
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return %s
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end)]])\format(ret_value)
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return ([[
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(function(compiler, vars)
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local ret
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%s
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return ret
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end)]])\format(lua)
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when "Statement"
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-- This case here is to prevent "ret =" from getting prepended when the macro might not want it
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if tree.value.type == "FunctionCall"
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alias = @get_alias(tree.value)
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if @defs[alias] and @defs[alias].is_macro
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return @run_macro(tree.value, "Statement")
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return "ret = "..(@tree_to_lua(tree.value))
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when "FunctionCall"
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alias = @get_alias(tree)
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if @defs[alias] and @defs[alias].is_macro
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return @run_macro(tree, "Expression")
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else
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args = [@tree_to_lua(a) for a in *tree.value when a.type != "Word"]
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insert args, 1, repr(alias)
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return @@comma_separated_items("compiler:call(", args, ")")
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when "String"
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return repr(@@unescape_string(tree.value))
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when "Longstring"
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concat_parts = {}
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string_buffer = ""
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for i,line in ipairs(tree.value)
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if i > 1 then string_buffer ..= "\n"
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for bit in *line
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if type(bit) == "string"
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string_buffer ..= bit\gsub("\\\\","\\")
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else
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if string_buffer ~= ""
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insert concat_parts, repr(string_buffer)
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string_buffer = ""
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insert concat_parts, "compiler.utils.repr_if_not_string(#{@tree_to_lua(bit)})"
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if string_buffer ~= ""
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insert concat_parts, repr(string_buffer)
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if #concat_parts == 0
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return "''"
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elseif #concat_parts == 1
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return concat_parts[1]
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else
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return "(#{concat(concat_parts, "..")})"
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when "Number"
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return tree.value
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when "List"
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if #tree.value == 0
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return "{}"
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elseif #tree.value == 1
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return "{#{@tree_to_lua(tree.value[1])}}"
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else
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return @@comma_separated_items("{", [@tree_to_lua(item) for item in *tree.value], "}")
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when "Var"
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return "vars[#{repr(tree.value)}]"
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else
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@error("Unknown/unimplemented thingy: #{tree.type}")
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@unescape_string: (str)=>
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str\gsub("\\(.)", ((c)-> STRING_ESCAPES[c] or c))
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@comma_separated_items: (open, items, close)=>
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bits = {open}
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so_far = 0
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for i,item in ipairs(items)
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if i < #items then item ..= ", "
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insert bits, item
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so_far += #item
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if so_far >= 80
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insert bits, "\n"
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so_far = 0
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insert bits, close
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return concat(bits)
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get_alias: (x)=>
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if not x then @error "Nothing to get alias from"
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-- Returns a single alias ("say %"), and list of args ({msg}) from a single rule def
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-- (e.g. "say %msg") or function call (e.g. FunctionCall({Word("say"), Var("msg")))
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if type(x) == 'string'
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alias = x\gsub("'"," '")\gsub("%%%S+","%%")\gsub("%s+"," ")
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args = [arg for arg in x\gmatch("%%(%S[^%s']*)")]
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return alias, args
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switch x.type
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when "String" then return @get_alias(x.value)
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when "Statement" then return @get_alias(x.value)
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when "FunctionCall"
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alias, args = {}, {}, {}
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for token in *x.value
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switch token.type
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when "Word"
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insert alias, token.value
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when "Var"
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insert alias, "%"
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insert args, token.value
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else
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insert alias, "%"
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insert args, token
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return concat(alias," "), args
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get_aliases:(x)=>
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if not x then @error "Nothing to get aliases from"
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if type(x) == 'string'
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alias, args = @get_alias(x)
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return {[alias]: args}
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switch x.type
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when "String" then return @get_aliases({x.value})
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when "Statement" then return @get_aliases({x.value})
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when "FunctionCall" then return @get_aliases({x})
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when "List" then x = x.value
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when "Block" then x = x.value
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with {}
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for y in *x
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alias,args = @get_alias(y)
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[alias] = args
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var_to_lua_identifier: (var)=>
|
|
-- Converts arbitrary nomsu vars to valid lua identifiers by replacing illegal
|
|
-- characters with escape sequences
|
|
if var.type != "Var"
|
|
@error("Tried to convert something that wasn't a Var into a lua identifier: it was not a Var, it was: "..label.type)
|
|
"var"..(var.value\gsub "%W", (verboten)->
|
|
if verboten == "_" then "__" else ("_%x")\format(verboten\byte!))
|
|
|
|
_yield_tree: (tree, indent_level=0)=>
|
|
ind = (s) -> INDENT\rep(indent_level)..s
|
|
switch tree.type
|
|
when "File"
|
|
coroutine.yield(ind"File:")
|
|
@_yield_tree(tree.value.body, indent_level+1)
|
|
when "Errors" then coroutine.yield(ind"Error:\n#{tree.value}")
|
|
when "Block"
|
|
for chunk in *tree.value
|
|
@_yield_tree(chunk, indent_level)
|
|
when "Thunk"
|
|
coroutine.yield(ind"Thunk:")
|
|
@_yield_tree(tree.value, indent_level+1)
|
|
when "Statement" then @_yield_tree(tree.value, indent_level)
|
|
when "FunctionCall"
|
|
alias = @get_alias tree
|
|
args = [a for a in *tree.value when a.type != "Word"]
|
|
if #args == 0
|
|
coroutine.yield(ind"Call [#{alias}]!")
|
|
else
|
|
coroutine.yield(ind"Call [#{alias}]:")
|
|
for a in *args
|
|
@_yield_tree(a, indent_level+1)
|
|
when "String" then coroutine.yield(ind(repr(tree.value)))
|
|
when "Longstring" then coroutine.yield(ind(repr(tree.value)))
|
|
when "Number" then coroutine.yield(ind(tree.value))
|
|
when "Var" then coroutine.yield ind"Var[#{repr(tree.value)}]"
|
|
when "List"
|
|
if #tree.value == 0
|
|
coroutine.yield(ind("<Empty List>"))
|
|
else
|
|
coroutine.yield(ind"List:")
|
|
for item in *tree.value
|
|
@_yield_tree(item, indent_level+1)
|
|
else error("Unknown/unimplemented thingy: #{tree.type}")
|
|
|
|
print_tree:(tree)=>
|
|
for line in coroutine.wrap(-> @_yield_tree(tree))
|
|
@writeln(line)
|
|
|
|
stringify_tree:(tree)=>
|
|
result = {}
|
|
for line in coroutine.wrap(-> @_yield_tree(tree))
|
|
insert(result, line)
|
|
return concat result, "\n"
|
|
|
|
run: (src, filename, output_file=nil)=>
|
|
if @debug
|
|
@writeln "COMPILING:\n#{src}"
|
|
tree = @parse(src, filename)
|
|
assert tree, "Tree failed to compile: #{src}"
|
|
code, retval = @tree_to_lua(tree)
|
|
if output_file
|
|
output = io.open(output_file, "w")
|
|
output\write(code)
|
|
return retval, code
|
|
|
|
error: (...)=>
|
|
@writeln "ERROR!"
|
|
@writeln(...)
|
|
@writeln("Callstack:")
|
|
for i=#@callstack,1,-1
|
|
@writeln " #{@callstack[i]}"
|
|
@writeln " <top level>"
|
|
@callstack = {}
|
|
error!
|
|
|
|
test: (src, filename, expected)=>
|
|
i = 1
|
|
while i != nil
|
|
start,stop = src\find("\n\n", i)
|
|
|
|
test = src\sub(i,start)
|
|
i = stop
|
|
start,stop = test\find"==="
|
|
if not start or not stop then
|
|
@error("WHERE'S THE ===? in:\n#{test}")
|
|
test_src, expected = test\sub(1,start-1), test\sub(stop+1,-1)
|
|
expected = expected\match'[\n]*(.*[^\n])'
|
|
tree = @parse(test_src, filename)
|
|
got = @stringify_tree(tree.value.body)
|
|
if got != expected
|
|
@error"TEST FAILED!\nSource:\n#{test_src}\nExpected:\n#{expected}\n\nGot:\n#{got}"
|
|
|
|
|
|
initialize_core: =>
|
|
-- Sets up some core functionality
|
|
@defmacro "lua block %lua_code", (vars, kind)=>
|
|
if kind == "Expression" then error("Expected to be in statement.")
|
|
inner_vars = setmetatable({}, {__index:(_,key)-> "vars[#{repr(key)}]"})
|
|
lua = @tree_to_value(vars.lua_code, inner_vars)
|
|
if not lua\match("^do\n.*\nend$")
|
|
lua = "do\n#{lua}\nend"
|
|
return lua, true
|
|
|
|
@defmacro "lua expr %lua_code", (vars, kind)=>
|
|
lua_code = vars.lua_code.value
|
|
inner_vars = setmetatable({}, {__index:(_,key)-> "vars[#{repr(key)}]"})
|
|
lua = @tree_to_value(vars.lua_code, inner_vars)
|
|
return lua
|
|
|
|
@def "require %filename", (vars)=>
|
|
if not @loaded_files[vars.filename]
|
|
file = io.open(vars.filename)
|
|
if not file
|
|
@error "File does not exist: #{vars.filename}"
|
|
@loaded_files[vars.filename] = (@run(file\read('*a'), vars.filename)) or true
|
|
return @loaded_files[vars.filename]
|
|
|
|
@def "run file %filename", (vars)=>
|
|
file = io.open(vars.filename)
|
|
if not file
|
|
@error "File does not exist: #{vars.filename}"
|
|
return @run(file\read('*a'), vars.filename)
|
|
|
|
|
|
-- Run on the command line via "./nomsu.moon input_file.nom" to execute
|
|
-- and "./nomsu.moon input_file.nom output_file.lua" to compile (use "-" to compile to stdout)
|
|
if arg and arg[1]
|
|
--ProFi = require 'ProFi'
|
|
--ProFi\start()
|
|
c = NomsuCompiler()
|
|
input = io.open(arg[1])\read("*a")
|
|
-- If run via "./nomsu.moon file.nom -", then silence output and print generated
|
|
-- source code instead.
|
|
_write = c.write
|
|
if arg[2] == "-"
|
|
c.write = ->
|
|
retval, code = c\run(input, arg[1])
|
|
c.write = _write -- put it back
|
|
if arg[2]
|
|
output = if arg[2] == "-"
|
|
io.output()
|
|
else io.open(arg[2], 'w')
|
|
|
|
output\write [[
|
|
local load = function()
|
|
]]
|
|
output\write(code)
|
|
output\write [[
|
|
|
|
end
|
|
local NomsuCompiler = require('nomsu')
|
|
local c = NomsuCompiler()
|
|
return load()(c, {})
|
|
]]
|
|
--ProFi\stop()
|
|
--ProFi\writeReport( 'MyProfilingReport.txt' )
|
|
|
|
elseif arg
|
|
-- REPL:
|
|
c = NomsuCompiler()
|
|
c\run('require "lib/core.nom"')
|
|
while true
|
|
buff = ""
|
|
while true
|
|
io.write(">> ")
|
|
line = io.read("*L")
|
|
if line == "\n" or not line
|
|
break
|
|
buff ..= line
|
|
if #buff == 0
|
|
break
|
|
ok, ret = pcall(-> c\run(buff))
|
|
if ok and ret != nil
|
|
print "= "..repr(ret)
|
|
|
|
return NomsuCompiler
|