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

# This module handles the reading of the config file.

import
  llstream, commands, os, strutils, msgs, lexer, ast,
  options, idents, wordrecg, strtabs, lineinfos, pathutils, scriptconfig

when defined(nimPreviewSlimSystem):
  import std/syncio

# ---------------- configuration file parser -----------------------------
# we use Nim's lexer here to save space and work

proc ppGetTok(L: var Lexer, tok: var Token) =
  # simple filter
  rawGetTok(L, tok)
  while tok.tokType in {tkComment}: rawGetTok(L, tok)

proc parseExpr(L: var Lexer, tok: var Token; config: ConfigRef): bool
proc parseAtom(L: var Lexer, tok: var Token; config: ConfigRef): bool =
  if tok.tokType == tkParLe:
    ppGetTok(L, tok)
    result = parseExpr(L, tok, config)
    if tok.tokType == tkParRi: ppGetTok(L, tok)
    else: lexMessage(L, errGenerated, "expected closing ')'")
  elif tok.tokType == tkNot:
    ppGetTok(L, tok)
    result = not parseAtom(L, tok, config)
  else:
    result = isDefined(config, tok.ident.s)
    ppGetTok(L, tok)

proc parseAndExpr(L: var Lexer, tok: var Token; config: ConfigRef): bool =
  result = parseAtom(L, tok, config)
  while tok.tokType == tkAnd:
    ppGetTok(L, tok)          # skip "and"
    var b = parseAtom(L, tok, config)
    result = result and b

proc parseExpr(L: var Lexer, tok: var Token; config: ConfigRef): bool =
  result = parseAndExpr(L, tok, config)
  while tok.tokType == tkOr:
    ppGetTok(L, tok)          # skip "or"
    var b = parseAndExpr(L, tok, config)
    result = result or b

proc evalppIf(L: var Lexer, tok: var Token; config: ConfigRef)olspan='5' class='logmsg'>
Fixes #9177