public PythonAst(Statement body, bool isModule, PythonLanguageFeatures languageFeatures, bool printExpressions) {
ContractUtils.RequiresNotNull(body, "body");
_body = body;
_isModule = isModule;
_printExpressions = printExpressions;
_languageFeatures = languageFeatures;
}
private Parser(Tokenizer tokenizer, ErrorSink errorSink, ParserSink parserSink, PythonLanguageFeatures languageFeatures) {
ContractUtils.RequiresNotNull(tokenizer, "tokenizer");
ContractUtils.RequiresNotNull(errorSink, "errorSink");
ContractUtils.RequiresNotNull(parserSink, "parserSink");
tokenizer.ErrorSink = new TokenizerErrorSink(this);
_tokenizer = tokenizer;
_errors = errorSink;
_sink = parserSink;
Reset(tokenizer.SourceUnit, languageFeatures);
}
// 'from' relative_module 'import' identifier ['as' name] (',' identifier ['as' name]) *
// 'from' relative_module 'import' '(' identifier ['as' name] (',' identifier ['as' name])* [','] ')'
// 'from' module 'import' "*"
private FromImportStatement ParseFromImportStmt() {
Eat(TokenKind.KeywordFrom);
SourceLocation start = GetStart();
ModuleName dname = ParseRelativeModuleName();
Eat(TokenKind.KeywordImport);
bool ateParen = MaybeEat(TokenKind.LeftParenthesis);
SymbolId[] names;
SymbolId[] asNames;
bool fromFuture = false;
if (MaybeEat(TokenKind.Multiply)) {
names = FromImportStatement.Star;
asNames = null;
if (dname is RelativeModuleName) {
ReportSyntaxError("'import *' not allowed with 'from .'");
}
} else {
List<SymbolId> l = new List<SymbolId>();
List<SymbolId> las = new List<SymbolId>();
if (MaybeEat(TokenKind.LeftParenthesis)) {
ParseAsNameList(l, las);
Eat(TokenKind.RightParenthesis);
} else {
ParseAsNameList(l, las);
}
names = l.ToArray();
asNames = las.ToArray();
}
// Process from __future__ statement
if (dname.Names.Count == 1 && dname.Names[0] == Symbols.Future) {
if (!_fromFutureAllowed) {
ReportSyntaxError(IronPython.Resources.MisplacedFuture);
}
if (names == FromImportStatement.Star) {
ReportSyntaxError(IronPython.Resources.NoFutureStar);
}
fromFuture = true;
foreach (SymbolId name in names) {
if (name == Symbols.Division) {
_languageFeatures |= PythonLanguageFeatures.TrueDivision;
} else if (name == Symbols.WithStmt) {
_languageFeatures |= PythonLanguageFeatures.AllowWithStatement;
} else if (name == Symbols.AbsoluteImport) {
_languageFeatures |= PythonLanguageFeatures.AbsoluteImports;
} else if (name == Symbols.PrintFunction && Python26) {
_languageFeatures |= PythonLanguageFeatures.PrintFunction;
_tokenizer.PrintFunction = true;
} else if (name == Symbols.UnicodeLiterals && Python26) {
// nop for us, just ignore it...
} else if (name == Symbols.NestedScopes) {
} else if (name == Symbols.Generators) {
} else {
string strName = SymbolTable.IdToString(name);
fromFuture = false;
if (strName != "braces") {
ReportSyntaxError(IronPython.Resources.UnknownFutureFeature + strName);
} else {
// match CPython error message
ReportSyntaxError(IronPython.Resources.NotAChance);
}
}
}
}
if (ateParen) {
Eat(TokenKind.RightParenthesis);
}
FromImportStatement ret = new FromImportStatement(dname, names, asNames, fromFuture, AbsoluteImports);
ret.SetLoc(start, GetEnd());
return ret;
}
public void Reset(SourceUnit sourceUnit, PythonLanguageFeatures languageFeatures) {
ContractUtils.RequiresNotNull(sourceUnit, "sourceUnit");
_sourceUnit = sourceUnit;
_languageFeatures = languageFeatures;
_token = new TokenWithSpan();
_lookahead = new TokenWithSpan();
_fromFutureAllowed = true;
_functions = null;
_privatePrefix = null;
_parsingStarted = false;
_errorCode = 0;
}
/// <summary>
/// Creates a new PythonCompilerOptions with the specified language features enabled.
/// </summary>
public PythonCompilerOptions(PythonLanguageFeatures features) {
_languageFeatures = features;
}
/// <summary>
/// Copy constructor.
/// </summary>
internal PythonModule(Scope/*!*/ scope, PythonModule/*!*/ module)
: base(scope) {
Assert.NotNull(module);
_features = module.LanguageFeatures;
}
protected override void ModuleReloading() {
base.ModuleReloading();
_features = PythonLanguageFeatures.Default;
_showCls = false;
}
