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#
#
# The Nimrod Compiler
# (c) Copyright 2011 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, nversion, commands, os, strutils, msgs, platform, condsyms, lexer,
options, idents, wordrecg
# ---------------- configuration file parser -----------------------------
# we use Nimrod's scanner here to safe space and work
proc ppGetTok(L: var TLexer, tok: PToken) =
# simple filter
rawGetTok(L, tok[])
while tok.tokType in {tkInd, tkSad, tkDed, tkComment}: rawGetTok(L, tok[])
proc parseExpr(L: var TLexer, tok: PToken): bool
proc parseAtom(L: var TLexer, tok: PToken): bool =
if tok.tokType == tkParLe:
ppGetTok(L, tok)
result = parseExpr(L, tok)
if tok.tokType == tkParRi: ppGetTok(L, tok)
else: lexMessage(L, errTokenExpected, "\')\'")
elif tok.ident.id == ord(wNot):
ppGetTok(L, tok)
result = not parseAtom(L, tok)
else:
result = isDefined(tok.ident)
ppGetTok(L, tok)
proc parseAndExpr(L: var TLexer, tok: PToken): bool =
result = parseAtom(L, tok)
while tok.ident.id == ord(wAnd):
ppGetTok(L, tok) # skip "and"
var b = parseAtom(L, tok)
result = result and b
proc parseExpr(L: var TLexer, tok: PToken): bool =
result = parseAndExpr(L, tok)
while tok.ident.id == ord(wOr):
ppGetTok(L, tok) # skip "or"
var b = parseAndExpr(L, tok)
result = result or b
proc EvalppIf(L: var TLexer, tok: PToken): bool =
ppGetTok(L, tok) # skip 'if' or 'elif'
result = parseExpr(L, tok)
if tok.tokType == tkColon: ppGetTok(L, tok)
else: lexMessage(L, errTokenExpected, "\':\'")
var condStack: seq[bool] = @[]
proc doEnd(L: var TLexer, tok: PToken) =
if high(condStack) < 0: lexMessage(L, errTokenExpected, "@if")
ppGetTok(L, tok) # skip 'end'
setlen(condStack, high(condStack))
type
TJumpDest = enum
jdEndif, jdElseEndif
proc jumpToDirective(L: var TLexer, tok: PToken, dest: TJumpDest)
proc doElse(L: var TLexer, tok: PToken) =
if high(condStack) < 0: lexMessage(L, errTokenExpected, "@if")
ppGetTok(L, tok)
if tok.tokType == tkColon: ppGetTok(L, tok)
if condStack[high(condStack)]: jumpToDirective(L, tok, jdEndif)
proc doElif(L: var TLexer, tok: PToken) =
if high(condStack) < 0: lexMessage(L, errTokenExpected, "@if")
var res = EvalppIf(L, tok)
if condStack[high(condStack)] or not res: jumpToDirective(L, tok, jdElseEndif)
else: condStack[high(condStack)] = true
proc jumpToDirective(L: var TLexer, tok: PToken, dest: TJumpDest) =
var nestedIfs = 0
while True:
if (tok.ident != nil) and (tok.ident.s == "@"):
ppGetTok(L, tok)
case whichKeyword(tok.ident)
of wIf:
Inc(nestedIfs)
of wElse:
if (dest == jdElseEndif) and (nestedIfs == 0):
doElse(L, tok)
break
of wElif:
if (dest == jdElseEndif) and (nestedIfs == 0):
doElif(L, tok)
break
of wEnd:
if nestedIfs == 0:
doEnd(L, tok)
break
if nestedIfs > 0: Dec(nestedIfs)
else:
nil
ppGetTok(L, tok)
elif tok.tokType == tkEof:
lexMessage(L, errTokenExpected, "@end")
else:
ppGetTok(L, tok)
proc parseDirective(L: var TLexer, tok: PToken) =
ppGetTok(L, tok) # skip @
case whichKeyword(tok.ident)
of wIf:
setlen(condStack, len(condStack) + 1)
var res = EvalppIf(L, tok)
condStack[high(condStack)] = res
if not res: jumpToDirective(L, tok, jdElseEndif)
of wElif: doElif(L, tok)
of wElse: doElse(L, tok)
of wEnd: doEnd(L, tok)
of wWrite:
ppGetTok(L, tok)
msgs.MsgWriteln(tokToStr(tok))
ppGetTok(L, tok)
of wPutEnv:
ppGetTok(L, tok)
var key = tokToStr(tok)
ppGetTok(L, tok)
os.putEnv(key, tokToStr(tok))
ppGetTok(L, tok)
of wPrependEnv:
ppGetTok(L, tok)
var key = tokToStr(tok)
ppGetTok(L, tok)
os.putEnv(key, tokToStr(tok) & os.getenv(key))
ppGetTok(L, tok)
of wAppendenv:
ppGetTok(L, tok)
var key = tokToStr(tok)
ppGetTok(L, tok)
os.putEnv(key, os.getenv(key) & tokToStr(tok))
ppGetTok(L, tok)
else: lexMessage(L, errInvalidDirectiveX, tokToStr(tok))
proc confTok(L: var TLexer, tok: PToken) =
ppGetTok(L, tok)
while tok.ident != nil and tok.ident.s == "@":
parseDirective(L, tok) # else: give the token to the parser
proc checkSymbol(L: TLexer, tok: PToken) =
if tok.tokType notin {tkSymbol..pred(tkIntLit), tkStrLit..tkTripleStrLit}:
lexMessage(L, errIdentifierExpected, tokToStr(tok))
proc parseAssignment(L: var TLexer, tok: PToken) =
if tok.ident.id == getIdent("-").id or tok.ident.id == getIdent("--").id:
confTok(L, tok) # skip unnecessary prefix
var info = getLineInfo(L) # safe for later in case of an error
checkSymbol(L, tok)
var s = tokToStr(tok)
confTok(L, tok) # skip symbol
var val = ""
while tok.tokType == tkDot:
add(s, '.')
confTok(L, tok)
checkSymbol(L, tok)
add(s, tokToStr(tok))
confTok(L, tok)
if tok.tokType == tkBracketLe:
# BUGFIX: val, not s!
# BUGFIX: do not copy '['!
confTok(L, tok)
checkSymbol(L, tok)
add(val, tokToStr(tok))
confTok(L, tok)
if tok.tokType == tkBracketRi: confTok(L, tok)
else: lexMessage(L, errTokenExpected, "\']\'")
add(val, ']')
if tok.tokType in {tkColon, tkEquals}:
if len(val) > 0: add(val, ':')
confTok(L, tok) # skip ':' or '='
checkSymbol(L, tok)
add(val, tokToStr(tok))
confTok(L, tok) # skip symbol
while tok.ident != nil and tok.ident.id == getIdent("&").id:
confTok(L, tok)
checkSymbol(L, tok)
add(val, tokToStr(tok))
confTok(L, tok)
processSwitch(s, val, passPP, info)
proc readConfigFile(filename: string) =
var
L: TLexer
tok: PToken
stream: PLLStream
new(tok)
stream = LLStreamOpen(filename, fmRead)
if stream != nil:
openLexer(L, filename, stream)
tok.tokType = tkEof # to avoid a pointless warning
confTok(L, tok) # read in the first token
while tok.tokType != tkEof: parseAssignment(L, tok)
if len(condStack) > 0: lexMessage(L, errTokenExpected, "@end")
closeLexer(L)
if gVerbosity >= 1: rawMessage(hintConf, filename)
proc getConfigPath(filename: string): string =
# try local configuration file:
result = joinPath(getConfigDir(), filename)
if not ExistsFile(result):
# try standard configuration file (installation did not distribute files
# the UNIX way)
result = joinPath([getPrefixDir(), "config", filename])
if not ExistsFile(result): result = "/etc/" & filename
proc LoadSpecialConfig*(configfilename: string) =
if optSkipConfigFile notin gGlobalOptions:
readConfigFile(getConfigPath(configfilename))
proc LoadConfig*(project: string) =
# set default value (can be overwritten):
if libpath == "":
# choose default libpath:
var prefix = getPrefixDir()
if (prefix == "/usr"): libpath = "/usr/lib/nimrod"
elif (prefix == "/usr/local"): libpath = "/usr/local/lib/nimrod"
else: libpath = joinPath(prefix, "lib")
LoadSpecialConfig("nimrod.cfg") # read project config file:
if optSkipProjConfigFile notin gGlobalOptions and project != "":
var conffile = changeFileExt(project, "cfg")
if existsFile(conffile): readConfigFile(conffile)
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