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#
#
# The Nim Compiler
# (c) Copyright 2013 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module implements the symbol importing mechanism.
import
intsets, strutils, os, ast, astalgo, msgs, options, idents, lookups,
semdata, passes, renderer, modulepaths, sigmatch, lineinfos
proc readExceptSet*(c: PContext, n: PNode): IntSet =
assert n.kind in {nkImportExceptStmt, nkExportExceptStmt}
result = initIntSet()
for i in 1 ..< n.len:
let ident = lookups.considerQuotedIdent(c, n[i])
result.incl(ident.id)
proc importPureEnumField*(c: PContext; s: PSym) =
let check = strTableGet(c.importTable.symbols, s.name)
if check == nil:
let checkB = strTableGet(c.pureEnumFields, s.name)
if checkB == nil:
strTableAdd(c.pureEnumFields, s)
else:
# mark as ambigous:
incl(c.ambiguousSymbols, checkB.id)
incl(c.ambiguousSymbols, s.id)
proc rawImportSymbol(c: PContext, s: PSym) =
# This does not handle stubs, because otherwise loading on demand would be
# pointless in practice. So importing stubs is fine here!
# check if we have already a symbol of the same name:
var check = strTableGet(c.importTable.symbols, s.name)
if check != nil and check.id != s.id:
if s.kind notin OverloadableSyms or check.kind notin OverloadableSyms:
# s and check need to be qualified:
incl(c.ambiguousSymbols, s.id)
incl(c.ambiguousSymbols, check.id)
# thanks to 'export' feature, it could be we import the same symbol from
# multiple sources, so we need to call 'StrTableAdd' here:
strTableAdd(c.importTable.symbols, s)
if s.kind == skType:
var etyp = s.typ
if etyp.kind in {tyBool, tyEnum}:
for j in 0 ..< sonsLen(etyp.n):
var e = etyp.n.sons[j].sym
if e.kind != skEnumField:
internalError(c.config, s.info, "rawImportSymbol")
# BUGFIX: because of aliases for enums the symbol may already
# have been put into the symbol table
# BUGFIX: but only iff they are the same symbols!
var it: TIdentIter
check = initIdentIter(it, c.importTable.symbols, e.name)
while check != nil:
if check.id == e.id:
e = nil
break
check = nextIdentIter(it, c.importTable.symbols)
if e != nil:
if sfPure notin s.flags:
rawImportSymbol(c, e)
else:
importPureEnumField(c, e)
else:
# rodgen assures that converters and patterns are no stubs
if s.kind == skConverter: addConverter(c, s)
if hasPattern(s): addPattern(c, s)
proc importSymbol(c: PContext, n: PNode, fromMod: PSym) =
let ident = lookups.considerQuotedIdent(c, n)
let s = strTableGet(fromMod.tab, ident)
if s == nil:
errorUndeclaredIdentifier(c, n.info, ident.s)
else:
when false:
if s.kind == skStub: loadStub(s)
let multiImport = s.kind notin ExportableSymKinds or s.kind in skProcKinds
# for an enumeration we have to add all identifiers
if multiImport:
# for a overloadable syms add all overloaded routines
var it: TIdentIter
var e = initIdentIter(it, fromMod.tab, s.name)
while e != nil:
if e.name.id != s.name.id: internalError(c.config, n.info, "importSymbol: 3")
if s.kind in ExportableSymKinds:
rawImportSymbol(c, e)
e = nextIdentIter(it, fromMod.tab)
else:
rawImportSymbol(c, s)
suggestSym(c.config, n.info, s, c.graph.usageSym, false)
proc importAllSymbolsExcept(c: PContext, fromMod: PSym, exceptSet: IntSet) =
var i: TTabIter
var s = initTabIter(i, fromMod.tab)
while s != nil:
if s.kind != skModule:
if s.kind != skEnumField:
if s.kind notin ExportableSymKinds:
internalError(c.config, s.info, "importAllSymbols: " & $s.kind & " " & s.name.s)
if exceptSet.isNil or s.name.id notin exceptSet:
rawImportSymbol(c, s)
s = nextIter(i, fromMod.tab)
proc importAllSymbols*(c: PContext, fromMod: PSym) =
var exceptSet: IntSet
importAllSymbolsExcept(c, fromMod, exceptSet)
proc importForwarded(c: PContext, n: PNode, exceptSet: IntSet) =
if n.isNil: return
case n.kind
of nkExportStmt:
for a in n:
assert a.kind == nkSym
let s = a.sym
if s.kind == skModule:
importAllSymbolsExcept(c, s, exceptSet)
elif exceptSet.isNil or s.name.id notin exceptSet:
rawImportSymbol(c, s)
of nkExportExceptStmt:
localError(c.config, n.info, "'export except' not implemented")
else:
for i in 0..safeLen(n)-1:
importForwarded(c, n.sons[i], exceptSet)
proc importModuleAs(c: PContext; n: PNode, realModule: PSym): PSym =
result = realModule
if n.kind != nkImportAs: discard
elif n.len != 2 or n.sons[1].kind != nkIdent:
localError(c.config, n.info, "module alias must be an identifier")
elif n.sons[1].ident.id != realModule.name.id:
# some misguided guy will write 'import abc.foo as foo' ...
result = createModuleAlias(realModule, n.sons[1].ident, realModule.info,
c.config.options)
proc myImportModule(c: PContext, n: PNode; importStmtResult: PNode): PSym =
let f = checkModuleName(c.config, n)
if f != InvalidFileIdx:
let L = c.graph.importStack.len
let recursion = c.graph.importStack.find(f)
c.graph.importStack.add f
#echo "adding ", toFullPath(f), " at ", L+1
if recursion >= 0:
var err = ""
for i in recursion ..< L:
if i > recursion: err.add "\n"
err.add toFullPath(c.config, c.graph.importStack[i]) & " imports " &
toFullPath(c.config, c.graph.importStack[i+1])
c.recursiveDep = err
result = importModuleAs(c, n, c.graph.importModuleCallback(c.graph, c.module, f))
#echo "set back to ", L
c.graph.importStack.setLen(L)
# we cannot perform this check reliably because of
# test: modules/import_in_config)
when true:
if result.info.fileIndex == c.module.info.fileIndex and
result.info.fileIndex == n.info.fileIndex:
localError(c.config, n.info, "A module cannot import itself")
if sfDeprecated in result.flags:
if result.constraint != nil:
message(c.config, n.info, warnDeprecated, result.constraint.strVal & "; " & result.name.s & " is deprecated")
else:
message(c.config, n.info, warnDeprecated, result.name.s & " is deprecated")
suggestSym(c.config, n.info, result, c.graph.usageSym, false)
importStmtResult.add newSymNode(result, n.info)
c.unusedImports.add((result, n.info))
#newStrNode(toFullPath(c.config, f), n.info)
proc transformImportAs(c: PContext; n: PNode): PNode =
if n.kind == nkInfix and considerQuotedIdent(c, n[0]).s == "as":
result = newNodeI(nkImportAs, n.info)
result.add n.sons[1]
result.add n.sons[2]
else:
result = n
proc impMod(c: PContext; it: PNode; importStmtResult: PNode) =
let it = transformImportAs(c, it)
let m = myImportModule(c, it, importStmtResult)
if m != nil:
var emptySet: IntSet
# ``addDecl`` needs to be done before ``importAllSymbols``!
addDecl(c, m, it.info) # add symbol to symbol table of module
importAllSymbolsExcept(c, m, emptySet)
#importForwarded(c, m.ast, emptySet)
proc evalImport*(c: PContext, n: PNode): PNode =
result = newNodeI(nkImportStmt, n.info)
for i in 0 ..< sonsLen(n):
let it = n.sons[i]
if it.kind == nkInfix and it.len == 3 and it[2].kind == nkBracket:
let sep = it[0]
let dir = it[1]
var imp = newNodeI(nkInfix, it.info)
imp.add sep
imp.add dir
imp.add sep # dummy entry, replaced in the loop
for x in it[2]:
# transform `a/b/[c as d]` to `/a/b/c as d`
if x.kind == nkInfix and x.sons[0].ident.s == "as":
let impAs = copyTree(x)
imp.sons[2] = x.sons[1]
impAs.sons[1] = imp
impMod(c, imp, result)
else:
imp.sons[2] = x
impMod(c, imp, result)
else:
impMod(c, it, result)
proc evalFrom*(c: PContext, n: PNode): PNode =
result = newNodeI(nkImportStmt, n.info)
checkMinSonsLen(n, 2, c.config)
n.sons[0] = transformImportAs(c, n.sons[0])
var m = myImportModule(c, n.sons[0], result)
if m != nil:
n.sons[0] = newSymNode(m)
addDecl(c, m, n.info) # add symbol to symbol table of module
for i in 1 ..< sonsLen(n):
if n.sons[i].kind != nkNilLit:
importSymbol(c, n.sons[i], m)
proc evalImportExcept*(c: PContext, n: PNode): PNode =
result = newNodeI(nkImportStmt, n.info)
checkMinSonsLen(n, 2, c.config)
n.sons[0] = transformImportAs(c, n.sons[0])
var m = myImportModule(c, n.sons[0], result)
if m != nil:
n.sons[0] = newSymNode(m)
addDecl(c, m, n.info) # add symbol to symbol table of module
importAllSymbolsExcept(c, m, readExceptSet(c, n))
#importForwarded(c, m.ast, exceptSet)
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