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Copy pathparser.cpp
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4476 lines (3523 loc) · 100 KB
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/****************************************************************************
**
** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Script Generator project on Qt Labs.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// c++ support
#include "parser.h"
#include "tokens.h"
#include "lexer.h"
#include "control.h"
#include <cstdlib>
#include <iostream>
#define ADVANCE(tk, descr) \
{ \
if (token_stream.lookAhead() != tk) { \
tokenRequiredError(tk); \
return false; \
} \
token_stream.nextToken(); \
}
#define ADVANCE_NR(tk, descr) \
do { \
if (token_stream.lookAhead() != tk) { \
tokenRequiredError(tk); \
} \
else \
token_stream.nextToken(); \
} while (0)
#define CHECK(tk) \
do { \
if (token_stream.lookAhead() != tk) { \
return false; \
} \
token_stream.nextToken(); \
} while (0)
#define UPDATE_POS(_node, start, end) \
do { \
(_node)->start_token = start; \
(_node)->end_token = end; \
} while (0)
Parser::Parser(Control *c)
: _M_location(token_stream, location_table, line_table),
control(c),
lexer(_M_location, control)
{
_M_block_errors = false;
}
Parser::~Parser()
{
}
void Parser::advance()
{
token_stream.nextToken();
}
TranslationUnitAST *Parser::parse(const char *contents,
std::size_t size, pool *p)
{
_M_block_errors = false;
_M_pool = p;
lexer.tokenize(contents, size);
token_stream.nextToken(); // skip the first token
Lexer *oldLexer = control->changeLexer (&lexer);
Parser *oldParser = control->changeParser (this);
TranslationUnitAST *ast = 0;
parseTranslationUnit(ast);
control->changeLexer (oldLexer);
control->changeParser (oldParser);
return ast;
}
bool Parser::parseWinDeclSpec(WinDeclSpecAST *&node)
{
if (token_stream.lookAhead() != Token_identifier)
return false;
std::size_t start = token_stream.cursor();
const NameSymbol *name_symbol = token_stream.symbol(token_stream.cursor());
QString name = name_symbol->as_string();
if (name != QLatin1String("__declspec"))
return false;
std::size_t specifier = token_stream.cursor();
token_stream.nextToken();
if (token_stream.lookAhead() != '(')
return false;
token_stream.nextToken();
if (token_stream.lookAhead() != Token_identifier)
return false;
std::size_t modifier = token_stream.cursor();
token_stream.nextToken();
if (token_stream.lookAhead() != ')')
return false;
token_stream.nextToken();
node = CreateNode<WinDeclSpecAST>(_M_pool);
node->specifier = specifier;
node->modifier = modifier;
UPDATE_POS(node, start, token_stream.cursor());
return true;
}
void Parser::tokenRequiredError(int token)
{
QString err;
err += "expected token ";
err += "``";
err += token_name(token);
err += "'' found ``";
err += token_name(token_stream.lookAhead());
err += "''";
reportError(err);
}
void Parser::syntaxError()
{
QString err;
err += "unexpected token ";
err += "``";
err += token_name(token_stream.lookAhead());
err += "''";
reportError(err);
}
void Parser::reportError(const QString& msg)
{
if (!_M_block_errors)
{
int line, column;
QString fileName;
std::size_t tok = token_stream.cursor();
location().positionAt(token_stream.position(tok),
&line, &column, &fileName);
Control::ErrorMessage errmsg;
errmsg.setLine(line + 1);
errmsg.setColumn(column);
errmsg.setFileName(fileName);
errmsg.setMessage(QLatin1String("** PARSER ERROR ") + msg);
control->reportError(errmsg);
}
}
bool Parser::skipUntil(int token)
{
while (token_stream.lookAhead())
{
if (token_stream.lookAhead() == token)
return true;
token_stream.nextToken();
}
return false;
}
bool Parser::skipUntilDeclaration()
{
while (token_stream.lookAhead())
{
switch(token_stream.lookAhead())
{
case ';':
case '~':
case Token_scope:
case Token_identifier:
case Token_operator:
case Token_char:
case Token_wchar_t:
case Token_bool:
case Token_short:
case Token_int:
case Token_long:
case Token_signed:
case Token_unsigned:
case Token_float:
case Token_double:
case Token_void:
case Token_extern:
case Token_namespace:
case Token_using:
case Token_typedef:
case Token_asm:
case Token_template:
case Token_export:
case Token_const: // cv
case Token_volatile: // cv
case Token_public:
case Token_protected:
case Token_private:
case Token_signals: // Qt
case Token_slots: // Qt
return true;
default:
token_stream.nextToken();
}
}
return false;
}
bool Parser::skipUntilStatement()
{
while (token_stream.lookAhead())
{
switch(token_stream.lookAhead())
{
case ';':
case '{':
case '}':
case Token_const:
case Token_volatile:
case Token_identifier:
case Token_case:
case Token_default:
case Token_if:
case Token_switch:
case Token_while:
case Token_do:
case Token_for:
case Token_break:
case Token_continue:
case Token_return:
case Token_goto:
case Token_try:
case Token_catch:
case Token_throw:
case Token_char:
case Token_wchar_t:
case Token_bool:
case Token_short:
case Token_int:
case Token_long:
case Token_signed:
case Token_unsigned:
case Token_float:
case Token_double:
case Token_void:
case Token_class:
case Token_struct:
case Token_union:
case Token_enum:
case Token_scope:
case Token_template:
case Token_using:
return true;
default:
token_stream.nextToken();
}
}
return false;
}
bool Parser::skip(int l, int r)
{
int count = 0;
while (token_stream.lookAhead())
{
int tk = token_stream.lookAhead();
if (tk == l)
++count;
else if (tk == r)
--count;
else if (l != '{' && (tk == '{' || tk == '}' || tk == ';'))
return false;
if (count == 0)
return true;
token_stream.nextToken();
}
return false;
}
bool Parser::parseName(NameAST *&node, bool acceptTemplateId)
{
std::size_t start = token_stream.cursor();
WinDeclSpecAST *winDeclSpec = 0;
parseWinDeclSpec(winDeclSpec);
NameAST *ast = CreateNode<NameAST>(_M_pool);
if (token_stream.lookAhead() == Token_scope)
{
ast->global = true;
token_stream.nextToken();
}
std::size_t idx = token_stream.cursor();
while (true)
{
UnqualifiedNameAST *n = 0;
if (!parseUnqualifiedName(n))
return false;
if (token_stream.lookAhead() == Token_scope)
{
token_stream.nextToken();
ast->qualified_names
= snoc(ast->qualified_names, n, _M_pool);
if (token_stream.lookAhead() == Token_template)
{
/// skip optional template #### @todo CHECK
token_stream.nextToken();
}
}
else
{
Q_ASSERT(n != 0);
if (!acceptTemplateId)
{
token_stream.rewind((int) n->start_token);
parseUnqualifiedName(n, false);
}
ast->unqualified_name = n;
break;
}
}
if (idx == token_stream.cursor())
return false;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseTranslationUnit(TranslationUnitAST *&node)
{
std::size_t start = token_stream.cursor();
TranslationUnitAST *ast = CreateNode<TranslationUnitAST>(_M_pool);
while (token_stream.lookAhead())
{
std::size_t startDecl = token_stream.cursor();
DeclarationAST *declaration = 0;
if (parseDeclaration(declaration))
{
ast->declarations =
snoc(ast->declarations, declaration, _M_pool);
}
else
{
// error recovery
if (startDecl == token_stream.cursor())
{
// skip at least one token
token_stream.nextToken();
}
skipUntilDeclaration();
}
}
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseDeclaration(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
switch(token_stream.lookAhead())
{
case ';':
token_stream.nextToken();
return true;
case Token_extern:
return parseLinkageSpecification(node);
case Token_namespace:
return parseNamespace(node);
case Token_using:
return parseUsing(node);
case Token_typedef:
return parseTypedef(node);
case Token_asm:
return parseAsmDefinition(node);
case Token_Q_ENUMS:
return parseQ_ENUMS(node);
case Token_Q_ENUM:
return parseQ_ENUM(node);
case Token_template:
case Token_export:
return parseTemplateDeclaration(node);
default:
{
const ListNode<std::size_t> *cv = 0;
parseCvQualify(cv);
const ListNode<std::size_t> *storageSpec = 0;
parseStorageClassSpecifier(storageSpec);
parseCvQualify(cv);
TypeSpecifierAST *spec = 0;
if (parseEnumSpecifier(spec)
|| parseClassSpecifier(spec)
|| parseForwardDeclarationSpecifier(spec))
{
parseCvQualify(cv);
spec->cv = cv;
const ListNode<InitDeclaratorAST*> *declarators = 0;
parseInitDeclaratorList(declarators);
ADVANCE(';', ";");
SimpleDeclarationAST *ast =
CreateNode<SimpleDeclarationAST>(_M_pool);
ast->storage_specifiers = storageSpec;
ast->type_specifier = spec;
ast->init_declarators = declarators;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
}
} // end switch
token_stream.rewind((int) start);
return parseDeclarationInternal(node);
}
bool Parser::parseLinkageSpecification(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_extern);
LinkageSpecificationAST *ast = CreateNode<LinkageSpecificationAST>(_M_pool);
if (token_stream.lookAhead() == Token_string_literal)
{
ast->extern_type = token_stream.cursor();
token_stream.nextToken();
}
if (token_stream.lookAhead() == '{')
{
parseLinkageBody(ast->linkage_body);
}
else if (!parseDeclaration(ast->declaration))
{
reportError(("Declaration syntax error"));
}
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseLinkageBody(LinkageBodyAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK('{');
LinkageBodyAST *ast = CreateNode<LinkageBodyAST>(_M_pool);
while (token_stream.lookAhead())
{
int tk = token_stream.lookAhead();
if (tk == '}')
break;
std::size_t startDecl = token_stream.cursor();
DeclarationAST *declaration = 0;
if (parseDeclaration(declaration))
{
ast->declarations = snoc(ast->declarations, declaration, _M_pool);
}
else
{
// error recovery
if (startDecl == token_stream.cursor())
{
// skip at least one token
token_stream.nextToken();
}
skipUntilDeclaration();
}
}
if (token_stream.lookAhead() != '}')
reportError(("} expected"));
else
token_stream.nextToken();
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseNamespace(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_namespace);
std::size_t namespace_name = 0;
if (token_stream.lookAhead() == Token_identifier)
{
namespace_name = token_stream.cursor();
token_stream.nextToken();
}
if (token_stream.lookAhead() == '=')
{
// namespace alias
token_stream.nextToken();
NameAST *name = 0;
if (parseName(name))
{
ADVANCE(';', ";");
NamespaceAliasDefinitionAST *ast
= CreateNode<NamespaceAliasDefinitionAST>(_M_pool);
ast->namespace_name = namespace_name;
ast->alias_name = name;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
else
{
reportError(("namespace expected"));
return false;
}
}
else if (token_stream.lookAhead() != '{')
{
reportError(("{ expected"));
return false;
}
NamespaceAST *ast = CreateNode<NamespaceAST>(_M_pool);
ast->namespace_name = namespace_name;
parseLinkageBody(ast->linkage_body);
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseUsing(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_using);
if (token_stream.lookAhead() == Token_namespace)
return parseUsingDirective(node);
UsingAST *ast = CreateNode<UsingAST>(_M_pool);
if (token_stream.lookAhead() == Token_typename)
{
ast->type_name = token_stream.cursor();
token_stream.nextToken();
}
if (!parseName(ast->name))
return false;
ADVANCE(';', ";");
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseUsingDirective(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_namespace);
NameAST *name = 0;
if (!parseName(name))
{
reportError(("Namespace name expected"));
return false;
}
ADVANCE(';', ";");
UsingDirectiveAST *ast = CreateNode<UsingDirectiveAST>(_M_pool);
ast->name = name;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseOperatorFunctionId(OperatorFunctionIdAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_operator);
OperatorFunctionIdAST *ast = CreateNode<OperatorFunctionIdAST>(_M_pool);
if (!parseOperator(ast->op))
{
ast->op = 0;
// parse cast operator
const ListNode<std::size_t> *cv = 0;
parseCvQualify(cv);
if (!parseSimpleTypeSpecifier(ast->type_specifier))
{
syntaxError();
return false;
}
parseCvQualify(cv);
ast->type_specifier->cv = cv;
PtrOperatorAST *ptr_op = 0;
while (parsePtrOperator(ptr_op))
ast->ptr_ops = snoc(ast->ptr_ops, ptr_op, _M_pool);
}
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseTemplateArgumentList(const ListNode<TemplateArgumentAST*> *&node,
bool reportError)
{
TemplateArgumentAST *templArg = 0;
if (!parseTemplateArgument(templArg))
return false;
node = snoc(node, templArg, _M_pool);
while (token_stream.lookAhead() == ',')
{
token_stream.nextToken();
if (!parseTemplateArgument(templArg))
{
if (reportError)
{
syntaxError();
break;
}
node = 0;
return false;
}
node = snoc(node, templArg, _M_pool);
}
return true;
}
bool Parser::parseTypedef(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
CHECK(Token_typedef);
TypeSpecifierAST *spec = 0;
if (!parseTypeSpecifierOrClassSpec(spec))
{
reportError(("Need a type specifier to declare"));
return false;
}
const ListNode<InitDeclaratorAST*> *declarators = 0;
if (!parseInitDeclaratorList(declarators))
{
//reportError(("Need an identifier to declare"));
//return false;
}
ADVANCE(';', ";");
TypedefAST *ast = CreateNode<TypedefAST>(_M_pool);
ast->type_specifier = spec;
ast->init_declarators = declarators;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseAsmDefinition(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
ADVANCE(Token_asm, "asm");
const ListNode<std::size_t> *cv = 0;
parseCvQualify(cv);
#if defined(__GNUC__)
#warning "implement me"
#endif
skip('(', ')');
token_stream.nextToken();
ADVANCE(';', ";");
AsmDefinitionAST *ast = CreateNode<AsmDefinitionAST>(_M_pool);
ast->cv = cv;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseTemplateDeclaration(DeclarationAST *&node)
{
std::size_t start = token_stream.cursor();
std::size_t exported = 0;
if (token_stream.lookAhead() == Token_export)
{
exported = token_stream.cursor();
token_stream.nextToken();
}
CHECK(Token_template);
const ListNode<TemplateParameterAST*> *params = 0;
if (token_stream.lookAhead() == '<')
{
token_stream.nextToken();
parseTemplateParameterList(params);
ADVANCE('>', ">");
}
DeclarationAST *declaration = 0;
if (!parseDeclaration(declaration))
{
reportError(("expected a declaration"));
}
TemplateDeclarationAST *ast = CreateNode<TemplateDeclarationAST>(_M_pool);
ast->exported = exported;
ast->template_parameters = params;
ast->declaration = declaration;
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseOperator(OperatorAST *&node)
{
std::size_t start = token_stream.cursor();
OperatorAST *ast = CreateNode<OperatorAST>(_M_pool);
switch(token_stream.lookAhead())
{
case Token_new:
case Token_delete:
{
ast->op = token_stream.cursor();
token_stream.nextToken();
if (token_stream.lookAhead() == '['
&& token_stream.lookAhead(1) == ']')
{
ast->open = token_stream.cursor();
token_stream.nextToken();
ast->close = token_stream.cursor();
token_stream.nextToken();
}
}
break;
case '+':
case '-':
case '*':
case '/':
case '%':
case '^':
case '&':
case '|':
case '~':
case '!':
case '=':
case '<':
case '>':
case ',':
case Token_assign:
case Token_shift:
case Token_eq:
case Token_not_eq:
case Token_leq:
case Token_geq:
case Token_and:
case Token_or:
case Token_incr:
case Token_decr:
case Token_ptrmem:
case Token_arrow:
ast->op = token_stream.cursor();
token_stream.nextToken();
break;
default:
if (token_stream.lookAhead() == '('
&& token_stream.lookAhead(1) == ')')
{
ast->op = ast->open = token_stream.cursor();
token_stream.nextToken();
ast->close = token_stream.cursor();
token_stream.nextToken();
}
else if (token_stream.lookAhead() == '['
&& token_stream.lookAhead(1) == ']')
{
ast->op = ast->open = token_stream.cursor();
token_stream.nextToken();
ast->close = token_stream.cursor();
token_stream.nextToken();
}
else
{
return false;
}
}
UPDATE_POS(ast, start, token_stream.cursor());
node = ast;
return true;
}
bool Parser::parseCvQualify(const ListNode<std::size_t> *&node)
{
std::size_t start = token_stream.cursor();
int tk;
while (0 != (tk = token_stream.lookAhead())
&& (tk == Token_const || tk == Token_volatile))
{
node = snoc(node, token_stream.cursor(), _M_pool);
token_stream.nextToken();
}
return start != token_stream.cursor();
}
bool Parser::parseSimpleTypeSpecifier(TypeSpecifierAST *&node,
bool onlyIntegral)
{
std::size_t start = token_stream.cursor();
bool isIntegral = false;
bool done = false;
const ListNode<std::size_t> *integrals = 0;
while (!done)
{
switch(token_stream.lookAhead())
{
case Token_char:
case Token_wchar_t:
case Token_bool:
case Token_short:
case Token_int:
case Token_long:
case Token_signed:
case Token_unsigned:
case Token_float:
case Token_double:
case Token_void:
integrals = snoc(integrals, token_stream.cursor(), _M_pool);
isIntegral = true;
token_stream.nextToken();
break;
default:
done = true;
}
}
SimpleTypeSpecifierAST *ast = CreateNode<SimpleTypeSpecifierAST>(_M_pool);
if (isIntegral)
{
ast->integrals = integrals;
}
else if (token_stream.lookAhead() == Token___typeof)
{
ast->type_of = token_stream.cursor();
token_stream.nextToken();
if (token_stream.lookAhead() == '(')
{
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