#
#
#           The Nimrod Compiler
#        (c) Copyright 2012 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#

import 
  os, lists, strutils, strtabs
  
const
  hasTinyCBackend* = defined(tinyc)

type                          # please make sure we have under 32 options
                              # (improves code efficiency a lot!)
  TOption* = enum             # **keep binary compatible**
    optNone, optObjCheck, optFieldCheck, optRangeCheck, optBoundsCheck, 
    optOverflowCheck, optNilCheck,
    optNaNCheck, optInfCheck,
    optAssert, optLineDir, optWarns, optHints, 
    optOptimizeSpeed, optOptimizeSize, optStackTrace, # stack tracing support
    optLineTrace,             # line tracing support (includes stack tracing)
    optEndb,                  # embedded debugger
    optByRef,                 # use pass by ref for objects
                              # (for interfacing with C)
    optProfiler,              # profiler turned on
    optImplicitStatic,        # optimization: implicit at compile time
                              # evaluation
    optPatterns               # en/disable pattern matching
  TOptions* = set[TOption]
  TGlobalOption* = enum       # **keep binary compatible**
    gloptNone, optForceFullMake, optBoehmGC, optRefcGC, optDeadCodeElim, 
    optListCmd, optCompileOnly, optNoLinking, 
    optSafeCode,              # only allow safe code
    optCDebug,                # turn on debugging information
    optGenDynLib,             # generate a dynamic library
    optGenStaticLib,          # generate a static library
    optGenGuiApp,             # generate a GUI application
    optGenScript,             # generate a script file to compile the *.c files
    optGenMapping,            # generate a mapping file
    optRun,                   # run the compiled project
    optSymbolFiles,           # use symbol files for speeding up compilation
    optSkipConfigFile,        # skip the general config file
    optSkipProjConfigFile,    # skip the project's config file
    optSkipUserConfigFile,    # skip the users's config file
    optSkipParentConfigFiles, # skip parent dir's config files
    optNoMain,                # do not generate a "main" proc
    optThreads,               # support for multi-threading
    optStdout,                # output to stdout
    optSuggest,               # ideTools: 'suggest'
    optContext,               # ideTools: 'context'
    optDef,                   # ideTools: 'def'
    optUsages,                # ideTools: 'usages'
    optThreadAnalysis,        # thread analysis pass
    optTaintMode,             # taint mode turned on
    optTlsEmulation,          # thread var emulation turned on
    optGenIndex               # generate index file for documentation;
                              # also: generate header file

  TGlobalOptions* = set[TGlobalOption]
  TCommands* = enum           # Nimrod's commands
                              # **keep binary compatible**
    cmdNone, cmdCompileToC, cmdCompileToCpp, cmdCompileToOC, 
    cmdCompileToEcmaScript, cmdCompileToLLVM, cmdInterpret, cmdPretty, cmdDoc, 
    cmdGenDepend, cmdDump, 
    cmdCheck,                 # semantic checking for whole project
    cmdParse,                 # parse a single file (for debugging)
    cmdScan,                  # scan a single file (for debugging)
    cmdIdeTools,              # ide tools
    cmdDef,                   # def feature (find definition for IDEs)
    cmdRst2html,              # convert a reStructuredText file to HTML
    cmdRst2tex,               # convert a reStructuredText file to TeX
    cmdInteractive,           # start interactive session
    cmdRun                    # run the project via TCC backend
  TStringSeq* = seq[string]

const 
  ChecksOptions* = {optObjCheck, optFieldCheck, optRangeCheck, optNilCheck, 
    optOverflowCheck, optBoundsCheck, optAssert, optNaNCheck, optInfCheck}

var 
  gOptions*: TOptions = {optObjCheck, optFieldCheck, optRangeCheck, 
                         optBoundsCheck, optOverflowCheck, optAssert, optWarns, 
                         optHints, optStackTrace, optLineTrace,
                         optPatterns}
  gGlobalOptions*: TGlobalOptions = {optRefcGC, optThreadAnalysis}
  gExitcode*: int8
  searchPaths*: TLinkedList
  outFile*: string = ""
  headerFile*: string = ""
  gCmd*: TCommands = cmdNone  # the command
  gVerbosity*: int            # how verbose the compiler is
  gNumberOfProcessors*: int   # number of processors

const 
  genSubDir* = "nimcache"
  NimExt* = "nim"
  RodExt* = "rod"
  HtmlExt* = "html"
  TexExt* = "tex"
  IniExt* = "ini"
  DefaultConfig* = "nimrod.cfg"
  DocConfig* = "nimdoc.cfg"
  DocTexConfig* = "nimdoc.tex.cfg"

# additional configuration variables:
var
  gConfigVars* = newStringTable(modeStyleInsensitive)
  libpath* = ""
  gProjectName* = "" # holds a name like 'nimrod'
  gProjectPath* = "" # holds a path like /home/alice/projects/nimrod/compiler/
  gProjectFull* = "" # projectPath/projectName
  nimcacheDir* = ""
  command* = "" # the main command (e.g. cc, check, scan, etc)
  commandArgs*: seq[string] = @[] # any arguments after the main command
  gKeepComments*: bool = true # whether the parser needs to keep comments
  implicitImports*: seq[string] = @[] # modules that are to be implicitly imported
  implicitIncludes*: seq[string] = @[] # modules that are to be implicitly included

const oKeepVariableNames* = true

proc mainCommandArg*: string =
  ## This is intended for commands like check or parse
  ## which will work on the main project file unless
  ## explicitly given a specific file argument
  if commandArgs.len > 0:
    result = commandArgs[0]
  else:
    result = gProjectName

proc existsConfigVar*(key: string): bool = 
  result = hasKey(gConfigVars, key)

proc getConfigVar*(key: string): string = 
  result = gConfigVars[key]

proc setConfigVar*(key, val: string) = 
  gConfigVars[key] = val

proc getOutFile*(filename, ext: string): string = 
  if options.outFile != "": result = options.outFile
  else: result = changeFileExt(filename, ext)
  
proc getPrefixDir*(): string = 
  ## gets the application directory
  result = SplitPath(getAppDir()).head

proc canonicalizePath*(path: string): string =
  result = path.expandFilename
  when not FileSystemCaseSensitive: result = result.toLower

proc shortenDir*(dir: string): string = 
  ## returns the interesting part of a dir
  var prefix = getPrefixDir() & dirSep
  if startsWith(dir, prefix): 
    return substr(dir, len(prefix))
  prefix = gProjectPath & dirSep
  if startsWith(dir, prefix):
    return substr(dir, len(prefix))
  result = dir

proc removeTrailingDirSep*(path: string): string = 
  if (len(path) > 0) and (path[len(path) - 1] == dirSep): 
    result = substr(path, 0, len(path) - 2)
  else: 
    result = path
  
proc getGeneratedPath: string =
  result = if nimcacheDir.len > 0: nimcacheDir else: gProjectPath.shortenDir /
                                                         genSubDir
  
proc toGeneratedFile*(path, ext: string): string = 
  ## converts "/home/a/mymodule.nim", "rod" to "/home/a/nimcache/mymodule.rod"
  var (head, tail) = splitPath(path)
  #if len(head) > 0: head = shortenDir(head & dirSep)
  result = joinPath([getGeneratedPath(), changeFileExt(tail, ext)])
  #echo "toGeneratedFile(", path, ", ", ext, ") = ", result

proc completeGeneratedFilePath*(f: string, createSubDir: bool = true): string = 
  var (head, tail) = splitPath(f)
  #if len(head) > 0: head = removeTrailingDirSep(shortenDir(head & dirSep))
  var subdir = getGeneratedPath() # / head
  if createSubDir:
    try: 
      createDir(subdir)
    except EOS: 
      writeln(stdout, "cannot create directory: " & subdir)
      quit(1)
  result = joinPath(subdir, tail)
  #echo "completeGeneratedFilePath(", f, ") = ", result

iterator iterSearchPath*(): string = 
  var it = PStrEntry(SearchPaths.head)
  while it != nil: 
    yield it.data
    it = PStrEntry(it.Next)

proc rawFindFile(f: string): string =
  for it in iterSearchPath():
    result = JoinPath(it, f)
    if ExistsFile(result):
      return result.canonicalizePath
  result = ""

proc FindFile*(f: string): string {.procvar.} = 
  result = rawFindFile(f)
  if len(result) == 0: result = rawFindFile(toLower(f))

proc findModule*(modulename: string): string {.inline.} =
  # returns path to module
  result = FindFile(AddFileExt(modulename, nimExt))

proc binaryStrSearch*(x: openarray[string], y: string): int = 
  var a = 0
  var b = len(x) - 1
  while a <= b: 
    var mid = (a + b) div 2
    var c = cmpIgnoreCase(x[mid], y)
    if c < 0: 
      a = mid + 1
    elif c > 0: 
      b = mid - 1
    else: 
      return mid
  result = - 1

# Can we keep this? I'm using it all the time
template nimdbg*: expr = c.filename.endsWith"nimdbg.nim"
template cnimdbg*: expr = p.module.filename.endsWith"nimdbg.nim"