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AstConverter.java
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AstConverter.java
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package org.python.indexer;
import org.python.antlr.PythonTree;
import org.python.antlr.Visitor;
import org.python.antlr.ast.*;
import org.python.antlr.base.excepthandler;
import org.python.antlr.base.expr;
import org.python.antlr.base.stmt;
import org.python.indexer.ast.*;
import org.python.indexer.ast.Assert;
import org.python.indexer.ast.Assign;
import org.python.indexer.ast.Attribute;
import org.python.indexer.ast.AugAssign;
import org.python.indexer.ast.BinOp;
import org.python.indexer.ast.BoolOp;
import org.python.indexer.ast.Break;
import org.python.indexer.ast.Call;
import org.python.indexer.ast.ClassDef;
import org.python.indexer.ast.Compare;
import org.python.indexer.ast.Continue;
import org.python.indexer.ast.Delete;
import org.python.indexer.ast.Dict;
import org.python.indexer.ast.DictComp;
import org.python.indexer.ast.Ellipsis;
import org.python.indexer.ast.ExceptHandler;
import org.python.indexer.ast.Exec;
import org.python.indexer.ast.For;
import org.python.indexer.ast.FunctionDef;
import org.python.indexer.ast.GeneratorExp;
import org.python.indexer.ast.Global;
import org.python.indexer.ast.If;
import org.python.indexer.ast.IfExp;
import org.python.indexer.ast.Import;
import org.python.indexer.ast.ImportFrom;
import org.python.indexer.ast.Index;
import org.python.indexer.ast.Lambda;
import org.python.indexer.ast.ListComp;
import org.python.indexer.ast.Module;
import org.python.indexer.ast.Name;
import org.python.indexer.ast.Num;
import org.python.indexer.ast.Pass;
import org.python.indexer.ast.Print;
import org.python.indexer.ast.Raise;
import org.python.indexer.ast.Repr;
import org.python.indexer.ast.Return;
import org.python.indexer.ast.Set;
import org.python.indexer.ast.SetComp;
import org.python.indexer.ast.Slice;
import org.python.indexer.ast.Str;
import org.python.indexer.ast.Subscript;
import org.python.indexer.ast.TryExcept;
import org.python.indexer.ast.TryFinally;
import org.python.indexer.ast.Tuple;
import org.python.indexer.ast.UnaryOp;
import org.python.indexer.ast.While;
import org.python.indexer.ast.With;
import org.python.indexer.ast.Yield;
import java.util.ArrayList;
import java.util.List;
/**
* Converts the antlr AST into the indexer's AST format.
*/
public class AstConverter extends Visitor {
public String convOp(Object t) {
if (t instanceof operatorType) {
switch((operatorType)t) {
case Add:
return "+";
case Sub:
return "-";
case Mult:
return "*";
case Div:
return "/";
case Mod:
return "%";
case Pow:
return "**";
case LShift:
return "<<";
case RShift:
return ">>";
case BitOr:
return "|";
case BitXor:
return "^";
case BitAnd:
return "&";
case FloorDiv:
return "//";
default:
return null;
}
}
if (t instanceof boolopType) {
switch ((boolopType)t) {
case And:
return "and";
case Or:
return "or";
default:
return null;
}
}
if (t instanceof unaryopType) {
switch ((unaryopType)t) {
case Invert:
return "~";
case Not:
return "not";
case USub:
return "-";
case UAdd:
return "+";
default:
return null;
}
}
if (t instanceof cmpopType) {
switch ((cmpopType)t) {
case Eq:
return "==";
case NotEq:
return "!=";
case Gt:
return ">";
case GtE:
return ">=";
case Lt:
return "<";
case LtE:
return "<=";
case In:
return "in";
case NotIn:
return "not in";
case Is:
return "is";
case IsNot:
return "is not";
default:
return null;
}
}
return null;
}
// Helpers for converting lists of things
private List<ExceptHandler> convertListExceptHandler(List<excepthandler> in) throws Exception {
List<ExceptHandler> out = new ArrayList<ExceptHandler>(in == null ? 0 : in.size());
if (in != null) {
for (excepthandler e : in) {
ExceptHandler nxh = (ExceptHandler)e.accept(this);
if (nxh != null) {
out.add(nxh);
}
}
}
return out;
}
private List<Node> convertListExpr(List<expr> in) throws Exception {
List<Node> out = new ArrayList<Node>(in == null ? 0 : in.size());
if (in != null) {
for (expr e : in) {
Node nx = (Node)e.accept(this);
if (nx != null) {
out.add(nx);
}
}
}
return out;
}
private List<Name> convertListName(List<org.python.antlr.ast.Name> in) throws Exception {
List<Name> out = new ArrayList<Name>(in == null ? 0 : in.size());
if (in != null) {
for (expr e : in) {
Name nn = (Name)e.accept(this);
if (nn != null) {
out.add(nn);
}
}
}
return out;
}
private Qname convertQname(List<org.python.antlr.ast.Name> in) throws Exception {
if (in == null) {
return null;
}
// This would be less ugly if we generated Qname nodes in the antlr ast.
Qname out = null;
int end = -1;
for (int i = in.size() - 1; i >= 0; i--) {
org.python.antlr.ast.Name n = in.get(i);
if (end == -1) {
end = n.getCharStopIndex();
}
Name nn = (Name)n.accept(this);
out = new Qname(out, nn, n.getCharStartIndex(), end);
}
return out;
}
private List<Keyword> convertListKeyword(List<keyword> in) throws Exception {
List<Keyword> out = new ArrayList<Keyword>(in == null ? 0 : in.size());
if (in != null) {
for (keyword e : in) {
Keyword nkw = new Keyword(e.getInternalArg(), convExpr(e.getInternalValue()));
if (nkw != null) {
out.add(nkw);
}
}
}
return out;
}
private Block convertListStmt(List<stmt> in) throws Exception {
List<Node> out = new ArrayList<Node>(in == null ? 0 : in.size());
if (in != null) {
for (stmt e : in) {
Node nx = (Node)e.accept(this);
if (nx != null) {
out.add(nx);
}
}
}
return new Block(out, 0, 0);
}
private Node convExpr(PythonTree e) throws Exception {
if (e == null) {
return null;
}
Object o = e.accept(this);
if (o instanceof Node) {
return (Node)o;
}
return null;
}
private int start(PythonTree tree) {
return tree.getCharStartIndex();
}
private int stop(PythonTree tree) {
return tree.getCharStopIndex();
}
@Override
public Object visitAssert(org.python.antlr.ast.Assert n) throws Exception {
return new Assert(convExpr(n.getInternalTest()),
convExpr(n.getInternalMsg()),
start(n), stop(n));
}
@Override
public Object visitAssign(org.python.antlr.ast.Assign n) throws Exception {
return new Assign(convertListExpr(n.getInternalTargets()),
convExpr(n.getInternalValue()),
start(n), stop(n));
}
@Override
public Object visitAttribute(org.python.antlr.ast.Attribute n) throws Exception {
return new Attribute(convExpr(n.getInternalValue()),
(Name)convExpr(n.getInternalAttrName()),
start(n), stop(n));
}
@Override
public Object visitAugAssign(org.python.antlr.ast.AugAssign n) throws Exception {
return new AugAssign(convExpr(n.getInternalTarget()),
convExpr(n.getInternalValue()),
convOp(n.getInternalOp()),
start(n), stop(n));
}
@Override
public Object visitBinOp(org.python.antlr.ast.BinOp n) throws Exception {
return new BinOp(convExpr(n.getInternalLeft()),
convExpr(n.getInternalRight()),
convOp(n.getInternalOp()),
start(n), stop(n));
}
@Override
public Object visitBoolOp(org.python.antlr.ast.BoolOp n) throws Exception {
BoolOp.OpType op;
switch (n.getInternalOp()) {
case And:
op = BoolOp.OpType.AND;
break;
case Or:
op = BoolOp.OpType.OR;
break;
default:
op = BoolOp.OpType.UNDEFINED;
break;
}
return new BoolOp(op, convertListExpr(n.getInternalValues()), start(n), stop(n));
}
@Override
public Object visitBreak(org.python.antlr.ast.Break n) throws Exception {
return new Break(start(n), stop(n));
}
@Override
public Object visitCall(org.python.antlr.ast.Call n) throws Exception {
return new Call(convExpr(n.getInternalFunc()),
convertListExpr(n.getInternalArgs()),
convertListKeyword(n.getInternalKeywords()),
convExpr(n.getInternalKwargs()),
convExpr(n.getInternalStarargs()),
start(n), stop(n));
}
@Override
public Object visitClassDef(org.python.antlr.ast.ClassDef n) throws Exception {
return new ClassDef((Name)convExpr(n.getInternalNameNode()),
convertListExpr(n.getInternalBases()),
convertListStmt(n.getInternalBody()),
start(n), stop(n));
}
@Override
public Object visitCompare(org.python.antlr.ast.Compare n) throws Exception {
return new Compare(convExpr(n.getInternalLeft()),
null, // XXX: why null?
convertListExpr(n.getInternalComparators()),
start(n), stop(n));
}
@Override
public Object visitContinue(org.python.antlr.ast.Continue n) throws Exception {
return new Continue(start(n), stop(n));
}
@Override
public Object visitDelete(org.python.antlr.ast.Delete n) throws Exception {
return new Delete(convertListExpr(n.getInternalTargets()), start(n), stop(n));
}
@Override
public Object visitDict(org.python.antlr.ast.Dict n) throws Exception {
return new Dict(convertListExpr(n.getInternalKeys()),
convertListExpr(n.getInternalValues()),
start(n), stop(n));
}
@Override
public Object visitEllipsis(org.python.antlr.ast.Ellipsis n) throws Exception {
return new Ellipsis(start(n), stop(n));
}
@Override
public Object visitExceptHandler(org.python.antlr.ast.ExceptHandler n) throws Exception {
return new ExceptHandler(convExpr(n.getInternalName()),
convExpr(n.getInternalType()),
convertListStmt(n.getInternalBody()),
start(n), stop(n));
}
@Override
public Object visitExec(org.python.antlr.ast.Exec n) throws Exception {
return new Exec(convExpr(n.getInternalBody()),
convExpr(n.getInternalGlobals()),
convExpr(n.getInternalLocals()),
start(n), stop(n));
}
@Override
public Object visitExpr(Expr n) throws Exception {
return new ExprStmt(convExpr(n.getInternalValue()), start(n), stop(n));
}
@Override
public Object visitFor(org.python.antlr.ast.For n) throws Exception {
return new For(convExpr(n.getInternalTarget()),
convExpr(n.getInternalIter()),
convertListStmt(n.getInternalBody()),
convertListStmt(n.getInternalOrelse()),
start(n), stop(n));
}
@Override
public Object visitFunctionDef(org.python.antlr.ast.FunctionDef n) throws Exception {
arguments args = n.getInternalArgs();
FunctionDef fn = new FunctionDef((Name)convExpr(n.getInternalNameNode()),
convertListExpr(args.getInternalArgs()),
convertListStmt(n.getInternalBody()),
convertListExpr(args.getInternalDefaults()),
(Name)convExpr(args.getInternalVarargName()),
(Name)convExpr(args.getInternalKwargName()),
start(n), stop(n));
fn.setDecoratorList(convertListExpr(n.getInternalDecorator_list()));
return fn;
}
@Override
public Object visitGeneratorExp(org.python.antlr.ast.GeneratorExp n) throws Exception {
List<Comprehension> generators =
new ArrayList<Comprehension>(n.getInternalGenerators().size());
for (comprehension c : n.getInternalGenerators()) {
generators.add(new Comprehension(convExpr(c.getInternalTarget()),
convExpr(c.getInternalIter()),
convertListExpr(c.getInternalIfs()),
start(c), stop(c)));
}
return new GeneratorExp(convExpr(n.getInternalElt()), generators, start(n), stop(n));
}
@Override
public Object visitGlobal(org.python.antlr.ast.Global n) throws Exception {
return new Global(convertListName(n.getInternalNameNodes()),
start(n), stop(n));
}
@Override
public Object visitIf(org.python.antlr.ast.If n) throws Exception {
return new If(convExpr(n.getInternalTest()),
convertListStmt(n.getInternalBody()),
convertListStmt(n.getInternalOrelse()),
start(n), stop(n));
}
@Override
public Object visitIfExp(org.python.antlr.ast.IfExp n) throws Exception {
return new IfExp(convExpr(n.getInternalTest()),
convExpr(n.getInternalBody()),
convExpr(n.getInternalOrelse()),
start(n), stop(n));
}
@Override
public Object visitImport(org.python.antlr.ast.Import n) throws Exception {
List<Alias> aliases = new ArrayList<Alias>(n.getInternalNames().size());
for (alias e : n.getInternalNames()) {
aliases.add(new Alias(e.getInternalName(),
convertQname(e.getInternalNameNodes()),
(Name)convExpr(e.getInternalAsnameNode()),
start(e), stop(e)));
}
return new Import(aliases, start(n), stop(n));
}
@Override
public Object visitImportFrom(org.python.antlr.ast.ImportFrom n) throws Exception {
List<Alias> aliases = new ArrayList<Alias>(n.getInternalNames().size());
for (alias e : n.getInternalNames()) {
aliases.add(new Alias(e.getInternalName(),
convertQname(e.getInternalNameNodes()),
(Name)convExpr(e.getInternalAsnameNode()),
start(e), stop(e)));
}
return new ImportFrom(n.getInternalModule(),
convertQname(n.getInternalModuleNames()),
aliases, start(n), stop(n));
}
@Override
public Object visitIndex(org.python.antlr.ast.Index n) throws Exception {
return new Index(convExpr(n.getInternalValue()), start(n), stop(n));
}
@Override
public Object visitLambda(org.python.antlr.ast.Lambda n) throws Exception {
arguments args = n.getInternalArgs();
return new Lambda(convertListExpr(args.getInternalArgs()),
convExpr(n.getInternalBody()),
convertListExpr(args.getInternalDefaults()),
(Name)convExpr(args.getInternalVarargName()),
(Name)convExpr(args.getInternalKwargName()),
start(n), stop(n));
}
@Override
public Object visitList(org.python.antlr.ast.List n) throws Exception {
return new NList(convertListExpr(n.getInternalElts()), start(n), stop(n));
}
@Override
public Object visitSet(org.python.antlr.ast.Set n) throws Exception {
return new Set(convertListExpr(n.getInternalElts()), start(n), stop(n));
}
// This is more complex than it should be, but let's wait until Jython add
// visitors to comprehensions
@Override
public Object visitListComp(org.python.antlr.ast.ListComp n) throws Exception {
List<Comprehension> generators =
new ArrayList<Comprehension>(n.getInternalGenerators().size());
for (comprehension c : n.getInternalGenerators()) {
generators.add(new Comprehension(convExpr(c.getInternalTarget()),
convExpr(c.getInternalIter()),
convertListExpr(c.getInternalIfs()),
start(c), stop(c)));
}
return new ListComp(convExpr(n.getInternalElt()), generators, start(n), stop(n));
}
@Override
public Object visitSetComp(org.python.antlr.ast.SetComp n) throws Exception {
List<Comprehension> generators =
new ArrayList<Comprehension>(n.getInternalGenerators().size());
for (comprehension c : n.getInternalGenerators()) {
generators.add(new Comprehension(convExpr(c.getInternalTarget()),
convExpr(c.getInternalIter()),
convertListExpr(c.getInternalIfs()),
start(c), stop(c)));
}
return new SetComp(convExpr(n.getInternalElt()), generators, start(n), stop(n));
}
@Override
public Object visitDictComp(org.python.antlr.ast.DictComp n) throws Exception {
List<Comprehension> generators =
new ArrayList<Comprehension>(n.getInternalGenerators().size());
for (comprehension c : n.getInternalGenerators()) {
generators.add(new Comprehension(convExpr(c.getInternalTarget()),
convExpr(c.getInternalIter()),
convertListExpr(c.getInternalIfs()),
start(c), stop(c)));
}
return new DictComp(convExpr(n.getInternalKey()), generators, start(n), stop(n));
}
@Override
public Object visitModule(org.python.antlr.ast.Module n) throws Exception {
return new Module(convertListStmt(n.getInternalBody()), start(n), stop(n));
}
@Override
public Object visitName(org.python.antlr.ast.Name n) throws Exception {
return new Name(n.getInternalId(), start(n), stop(n));
}
@Override
public Object visitNum(org.python.antlr.ast.Num n) throws Exception {
return new Num(n.getInternalN(), start(n), stop(n));
}
@Override
public Object visitPass(org.python.antlr.ast.Pass n) throws Exception {
return new Pass(start(n), stop(n));
}
@Override
public Object visitPrint(org.python.antlr.ast.Print n) throws Exception {
return new Print(convExpr(n.getInternalDest()),
convertListExpr(n.getInternalValues()),
start(n), stop(n));
}
@Override
public Object visitRaise(org.python.antlr.ast.Raise n) throws Exception {
return new Raise(convExpr(n.getInternalType()),
convExpr(n.getInternalInst()),
convExpr(n.getInternalTback()),
start(n), stop(n));
}
@Override
public Object visitRepr(org.python.antlr.ast.Repr n) throws Exception {
return new Repr(convExpr(n.getInternalValue()), start(n), stop(n));
}
@Override
public Object visitReturn(org.python.antlr.ast.Return n) throws Exception {
return new Return(convExpr(n.getInternalValue()), start(n), stop(n));
}
@Override
public Object visitSlice(org.python.antlr.ast.Slice n) throws Exception {
return new Slice(convExpr(n.getInternalLower()),
convExpr(n.getInternalStep()),
convExpr(n.getInternalUpper()),
start(n), stop(n));
}
@Override
public Object visitStr(org.python.antlr.ast.Str n) throws Exception {
return new Str(n.getInternalS(), start(n), stop(n));
}
@Override
public Object visitSubscript(org.python.antlr.ast.Subscript n) throws Exception {
return new Subscript(convExpr(n.getInternalValue()),
convExpr(n.getInternalSlice()),
start(n), stop(n));
}
@Override
public Object visitTryExcept(org.python.antlr.ast.TryExcept n) throws Exception {
return new TryExcept(convertListExceptHandler(n.getInternalHandlers()),
convertListStmt(n.getInternalBody()),
convertListStmt(n.getInternalOrelse()),
start(n), stop(n));
}
@Override
public Object visitTryFinally(org.python.antlr.ast.TryFinally n) throws Exception {
return new TryFinally(convertListStmt(n.getInternalBody()),
convertListStmt(n.getInternalFinalbody()),
start(n), stop(n));
}
@Override
public Object visitTuple(org.python.antlr.ast.Tuple n) throws Exception {
return new Tuple(convertListExpr(n.getInternalElts()), start(n), stop(n));
}
@Override
public Object visitUnaryOp(org.python.antlr.ast.UnaryOp n) throws Exception {
return new UnaryOp(null, // XXX: why null for operator?
convExpr(n.getInternalOperand()),
start(n), stop(n));
}
@Override
public Object visitWhile(org.python.antlr.ast.While n) throws Exception {
return new While(convExpr(n.getInternalTest()),
convertListStmt(n.getInternalBody()),
convertListStmt(n.getInternalOrelse()),
start(n), stop(n));
}
@Override
public Object visitWith(org.python.antlr.ast.With n) throws Exception {
return new With(convExpr(n.getInternalOptional_vars()),
convExpr(n.getInternalContext_expr()),
convertListStmt(n.getInternalBody()),
start(n), stop(n));
}
@Override
public Object visitYield(org.python.antlr.ast.Yield n) throws Exception {
return new Yield(convExpr(n.getInternalValue()), start(n), stop(n));
}
}