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Copy pathparse.h
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7340 lines (6387 loc) · 201 KB
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// Copyright (c) Herb Sutter
// SPDX-License-Identifier: CC-BY-NC-ND-4.0
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//===========================================================================
// Parser
//===========================================================================
#ifndef __CPP2_PARSE
#define __CPP2_PARSE
#include "lex.h"
#include <memory>
#include <variant>
#include <iostream>
namespace cpp2 {
auto violates_lifetime_safety = false;
//-----------------------------------------------------------------------
// Operator categorization
//
//G prefix-operator:
//G one of '!' '-' '+'
//GT parameter-direction
//G
auto is_prefix_operator(token const& tok)
-> bool
{
//if (to_passing_style(tok) != passing_style::invalid) {
// return true;
//}
switch (tok.type()) {
break;case lexeme::Not:
case lexeme::Minus:
case lexeme::Plus:
return true;
break;default:
return false;
}
}
//G postfix-operator:
//G one of '++' '--' '*' '&' '~' '$'
//G
auto is_postfix_operator(lexeme l)
-> bool
{
switch (l) {
break;case lexeme::PlusPlus:
case lexeme::MinusMinus:
case lexeme::Multiply:
case lexeme::Ampersand:
case lexeme::Tilde:
case lexeme::Dollar:
return true;
break;default:
return false;
}
}
//G assignment-operator:
//G one of '=' '*=' '/=' '%=' '+=' '-=' '>>=' '<<=' '&=' '^=' '|='
//G
auto is_assignment_operator(lexeme l)
-> bool
{
switch (l) {
break;case lexeme::Assignment:
case lexeme::MultiplyEq:
case lexeme::SlashEq:
case lexeme::ModuloEq:
case lexeme::PlusEq:
case lexeme::MinusEq:
case lexeme::RightShiftEq:
case lexeme::LeftShiftEq:
case lexeme::AmpersandEq:
case lexeme::CaretEq:
case lexeme::PipeEq:
return true;
break;default:
return false;
}
}
//-----------------------------------------------------------------------
//
// Parse tree node types
//
//-----------------------------------------------------------------------
//
//-----------------------------------------------------------------------
// try_visit
//
// Helper to visit whatever is in a variant where each
// alternative is a smart pointer
//
template <int I>
auto try_visit(auto& variant, auto& visitor, int depth)
-> void
{
if (variant.index() == I) {
auto const& s = std::get<I>(variant);
assert (s);
s->visit(visitor, depth+1);
}
}
struct expression_list_node;
struct id_expression_node;
struct declaration_node;
struct inspect_expression_node;
struct literal_node;
struct primary_expression_node
{
enum active { empty=0, identifier, expression_list, id_expression, declaration, inspect, literal };
std::variant<
std::monostate,
token const*,
std::unique_ptr<expression_list_node>,
std::unique_ptr<id_expression_node>,
std::unique_ptr<declaration_node>,
std::unique_ptr<inspect_expression_node>,
std::unique_ptr<literal_node>
> expr;
// API
//
auto is_identifier() const
-> bool;
auto is_id_expression() const
-> bool;
auto is_expression_list() const
-> bool;
auto get_expression_list() const
-> expression_list_node const*;
auto is_literal() const
-> bool;
auto template_args_count() -> int;
auto get_token() const -> token const*;
auto to_string() const
-> std::string;
// Internals
//
auto position() const -> source_position;
auto visit(auto& v, int depth) -> void;
};
struct literal_node {
token const* literal = {};
token const* user_defined_suffix = {};
// API
//
auto get_token() const
-> token const*
{
return literal;
}
auto to_string() const
-> std::string
{
assert (literal);
auto ret = literal->to_string(true);
if (user_defined_suffix) {
ret += user_defined_suffix->to_string(true);
}
return ret;
}
// Internals
//
auto position() const
-> source_position
{
assert (literal);
return literal->position();
}
auto visit(auto& v, int depth) -> void
{
v.start(*this, depth);
assert (literal);
literal->visit(v, depth+1);
if (user_defined_suffix) {
user_defined_suffix->visit(v, depth+1);
}
v.end(*this, depth);
}
};
struct postfix_expression_node;
struct prefix_expression_node
{
std::vector<token const*> ops;
std::unique_ptr<postfix_expression_node> expr;
// API
//
auto is_identifier() const
-> bool;
auto is_id_expression() const
-> bool;
auto is_expression_list() const
-> bool;
auto get_expression_list() const
-> expression_list_node const*;
auto get_postfix_expression_node() const
-> postfix_expression_node *
{
assert(expr);
return expr.get();
}
auto is_literal() const
-> bool;
auto is_result_a_temporary_variable() const -> bool;
auto to_string() const
-> std::string;
// Internals
//
auto position() const -> source_position;
auto visit(auto& v, int depth) -> void;
};
template<
String Name,
typename Term
>
struct binary_expression_node
{
std::unique_ptr<Term> expr;
struct term
{
token const* op;
std::unique_ptr<Term> expr;
};
std::vector<term> terms;
// API
//
auto is_identifier() const
-> bool
{
return terms.empty() && expr->is_identifier();
}
auto is_id_expression() const
-> bool
{
return terms.empty() && expr->is_id_expression();
}
auto is_expression_list() const
-> bool
{
return terms.empty() && expr->is_expression_list();
}
auto get_expression_list() const
-> expression_list_node const*
{
if (is_expression_list()) {
return expr->get_expression_list();
}
return {};
}
auto is_literal() const
-> bool
{
return terms.empty() && expr->is_literal();
}
// Get left-hand postfix-expression
auto get_postfix_expression_node() const
-> postfix_expression_node *
{
assert(expr);
return expr->get_postfix_expression_node();
}
// Get first right-hand postfix-expression, if there is one
auto get_second_postfix_expression_node() const
-> postfix_expression_node *
{
if (!terms.empty()) {
assert(terms.front().expr);
return terms.front().expr->get_postfix_expression_node();
}
// else
return {};
}
// "Simple" means binary (size>0) and not chained (size<2)
struct get_lhs_rhs_if_simple_binary_expression_with_ret {
postfix_expression_node* lhs;
Term* rhs;
};
auto get_lhs_rhs_if_simple_binary_expression_with(lexeme op) const
-> get_lhs_rhs_if_simple_binary_expression_with_ret
{
if (
std::ssize(terms) == 1
&& terms[0].op->type() == op
)
{
return {
get_postfix_expression_node(),
terms.front().expr.get()
};
}
// Else
return { nullptr, nullptr };
}
auto is_result_a_temporary_variable() const -> bool {
if constexpr (std::string_view(Name.value) == "assignment") {
assert(expr);
return expr->is_result_a_temporary_variable();
} else {
if (terms.empty()) {
assert(expr);
return expr->is_result_a_temporary_variable();
} else {
return true;
}
}
}
auto to_string() const
-> std::string
{
assert (expr);
auto ret = expr->to_string();
for (auto const& x : terms) {
assert (x.op);
ret += " " + x.op->to_string(true);
assert (x.expr);
ret += " " + x.expr->to_string();
}
return ret;
}
// Internals
//
auto position() const
-> source_position
{
assert (expr);
return expr->position();
}
auto visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
assert (expr);
expr->visit(v, depth+1);
for (auto const& x : terms) {
assert (x.op);
v.start(*x.op, depth+1);
assert (x.expr);
x.expr->visit(v, depth+1);
}
v.end(*this, depth);
}
};
struct is_as_expression_node;
using multiplicative_expression_node = binary_expression_node< "multiplicative" , is_as_expression_node >;
using additive_expression_node = binary_expression_node< "additive" , multiplicative_expression_node >;
using shift_expression_node = binary_expression_node< "shift" , additive_expression_node >;
using compare_expression_node = binary_expression_node< "compare" , shift_expression_node >;
using relational_expression_node = binary_expression_node< "relational" , compare_expression_node >;
using equality_expression_node = binary_expression_node< "equality" , relational_expression_node >;
using bit_and_expression_node = binary_expression_node< "bit-and" , equality_expression_node >;
using bit_xor_expression_node = binary_expression_node< "bit-xor" , bit_and_expression_node >;
using bit_or_expression_node = binary_expression_node< "bit-or" , bit_xor_expression_node >;
using logical_and_expression_node = binary_expression_node< "logical-and" , bit_or_expression_node >;
using logical_or_expression_node = binary_expression_node< "logical-or" , logical_and_expression_node >;
using assignment_expression_node = binary_expression_node< "assignment" , logical_or_expression_node >;
struct assignment_expression_lhs_rhs {
postfix_expression_node* lhs;
logical_or_expression_node* rhs;
};
struct expression_node
{
std::unique_ptr<assignment_expression_node> expr;
// API
//
auto is_identifier() const
-> bool
{
return expr->is_identifier();
}
auto is_id_expression() const
-> bool
{
return expr->is_id_expression();
}
auto is_expression_list() const
-> bool
{
return expr->is_expression_list();
}
auto get_expression_list() const
-> expression_list_node const*
{
if (is_expression_list()) {
return expr->get_expression_list();
}
return {};
}
auto is_literal() const
-> bool
{
return expr->is_literal();
}
auto get_lhs_rhs_if_simple_assignment() const
-> assignment_expression_lhs_rhs;
auto to_string() const
-> std::string
{
assert (expr);
return expr->to_string();
}
// Internals
//
auto position() const -> source_position
{
assert (expr);
return expr->position();
}
auto visit(auto& v, int depth) -> void
{
v.start(*this, depth);
assert (expr);
expr->visit(v, depth+1);
v.end(*this, depth);
}
};
enum class passing_style { in=0, copy, inout, out, move, forward, invalid };
auto to_passing_style(token const& t) -> passing_style {
if (t.type() == lexeme::Identifier) {
if (t == "in" ) { return passing_style::in; }
if (t == "copy" ) { return passing_style::copy; }
if (t == "inout" ) { return passing_style::inout; }
if (t == "out" ) { return passing_style::out; }
if (t == "move" ) { return passing_style::move; }
if (t == "forward") { return passing_style::forward; }
}
return passing_style::invalid;
}
auto to_string_view(passing_style pass) -> std::string_view {
switch (pass) {
break;case passing_style::in : return "in";
break;case passing_style::copy : return "copy";
break;case passing_style::inout : return "inout";
break;case passing_style::out : return "out";
break;case passing_style::move : return "move";
break;case passing_style::forward: return "forward";
break;default : return "INVALID passing_style";
}
}
struct expression_list_node
{
token const* open_paren = {};
token const* close_paren = {};
bool inside_initializer = false;
struct term {
passing_style pass = {};
std::unique_ptr<expression_node> expr;
auto visit(auto& v, int depth) -> void
{
v.start(*this, depth);
assert(expr);
expr->visit(v, depth+1);
v.end(*this, depth);
}
};
std::vector< term > expressions;
auto position() const
-> source_position
{
// Make sure this got set
assert (open_paren);
return open_paren->position();
}
auto visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
for (auto& x : expressions) {
x.visit(v, depth+1);
}
v.end(*this, depth);
}
};
auto primary_expression_node::is_identifier() const
-> bool
{
return expr.index() == identifier;
}
auto primary_expression_node::is_id_expression() const
-> bool
{
return expr.index() == id_expression;
}
auto primary_expression_node::is_expression_list() const
-> bool
{
return expr.index() == expression_list;
}
auto primary_expression_node::get_expression_list() const
-> expression_list_node const*
{
if (is_expression_list()) {
return std::get<expression_list>(expr).get();
}
return {};
}
auto primary_expression_node::is_literal() const
-> bool
{
return expr.index() == literal;
}
struct expression_statement_node
{
std::unique_ptr<expression_node> expr;
bool has_semicolon = false;
// API
//
auto to_string() const
-> std::string
{
assert (expr);
return expr->to_string();
}
// Internals
//
auto position() const
-> source_position
{
assert (expr);
return expr->position();
}
auto visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
assert (expr);
expr->visit(v, depth+1);
v.end(*this, depth);
}
};
struct capture {
postfix_expression_node* capture_expr;
std::string cap_sym = {};
std::string str = {};
std::string str_suppressed_move = {};
auto operator==(postfix_expression_node* p) { return capture_expr == p; }
};
struct capture_group {
std::vector<capture> members;
auto add(postfix_expression_node* p)
-> void
{
members.push_back({p});
}
auto remove(postfix_expression_node* p)
-> void;
~capture_group();
};
struct postfix_expression_node
{
std::unique_ptr<primary_expression_node> expr;
struct term
{
token const* op;
// This is used if *op is . - can be null
std::unique_ptr<id_expression_node> id_expr = {};
// These are used if *op is [ or ( - can be null
std::unique_ptr<expression_list_node> expr_list = {};
token const* op_close = {};
};
std::vector<term> ops;
capture_group* cap_grp = {};
~postfix_expression_node()
{
if (cap_grp) {
cap_grp->remove(this);
}
}
// API
//
auto is_identifier() const
-> bool
{
return ops.empty() && expr->is_identifier();
}
auto is_id_expression() const
-> bool
{
return ops.empty() && expr->is_id_expression();
}
auto is_expression_list() const
-> bool
{
return ops.empty() && expr->is_expression_list();
}
auto get_expression_list() const
-> expression_list_node const*
{
if (is_expression_list()) {
return expr->get_expression_list();
}
return {};
}
auto is_literal() const
-> bool
{
return ops.empty() && expr->is_literal();
}
auto get_first_token_ignoring_this() const
-> token const*;
auto is_result_a_temporary_variable() const -> bool {
if (ops.empty()) {
return false;
} else {
return (ops.front().op->type() == lexeme::Ampersand
|| ops.front().op->type() == lexeme::Tilde);
}
}
auto to_string() const
-> std::string;
// Internals
//
auto position() const -> source_position
{
assert (expr);
return expr->position();
}
auto visit(auto& v, int depth) -> void;
};
auto prefix_expression_node::is_identifier() const
-> bool
{
return ops.empty() && expr->is_identifier();
}
auto prefix_expression_node::is_id_expression() const
-> bool
{
return ops.empty() && expr->is_id_expression();
}
auto prefix_expression_node::is_expression_list() const
-> bool
{
return ops.empty() && expr->is_expression_list();
}
auto prefix_expression_node::get_expression_list() const
-> expression_list_node const*
{
if (is_expression_list()) {
return expr->get_expression_list();
}
return {};
}
auto prefix_expression_node::is_literal() const
-> bool
{
return ops.empty() && expr->is_literal();
}
auto prefix_expression_node::is_result_a_temporary_variable() const -> bool {
if (ops.empty()) {
return expr->is_result_a_temporary_variable();
} else {
return true;
}
}
auto expression_node::get_lhs_rhs_if_simple_assignment() const
-> assignment_expression_lhs_rhs
{
auto ret = expr->get_lhs_rhs_if_simple_binary_expression_with(lexeme::Assignment);
return { ret.lhs, ret.rhs };
}
auto capture_group::remove(postfix_expression_node* p)
-> void
{
p->cap_grp = {};
auto old_size = members.size();
std::erase(members, p);
assert (members.size() == old_size-1);
}
capture_group::~capture_group()
{
assert (members.empty());
// We shouldn't need to do this:
// while (!members.empty()) {
// remove(members.front().capture_expr);
// }
// if the capture_group outlives the tree of things that can point to it
// => each node with a capture_group should declare it as the first member
// before any other node that could own a postfix_expression that could
// point back up to that capture_group
}
auto prefix_expression_node::to_string() const
-> std::string
{
auto ret = std::string{};
for (auto const& x : ops) {
assert (x);
ret += x->as_string_view();
}
assert (expr);
return ret + expr->to_string();
}
auto prefix_expression_node::position() const
-> source_position
{
if (std::ssize(ops) > 0) {
return ops.front()->position();
}
assert (expr);
return expr->position();
}
auto prefix_expression_node::visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
for (auto const& x : ops) {
assert (x);
v.start(*x, depth+1);
}
assert (expr);
expr->visit(v, depth+1);
v.end(*this, depth);
}
struct type_id_node;
struct template_args_tag { };
struct unqualified_id_node
{
token const* identifier = {}; // required
enum active { empty=0, expression, type_id };
// These are used only if it's a template-id
source_position open_angle = {};
source_position close_angle = {};
struct term {
source_position comma;
std::variant<
std::monostate,
std::unique_ptr<expression_node>,
std::unique_ptr<type_id_node>
> arg;
};
std::vector<term> template_args;
auto template_args_count()
-> int
{
return std::ssize(template_args);
}
auto get_token() const
-> token const*
{
if (open_angle == source_position{}) {
assert (identifier);
return identifier;
}
// else
return {};
}
auto to_string() const
-> std::string;
auto position() const
-> source_position
{
assert (identifier);
return identifier->position();
}
auto visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
assert (identifier);
v.start(*identifier, depth+1);
if (open_angle != source_position{}) {
// Inform the visitor that this is a template args list
v.start(template_args_tag{}, depth);
assert(open_angle != source_position{});
assert(close_angle != source_position{});
assert(template_args.empty()
|| template_args.front().comma == source_position{});
for (auto& a : template_args) {
try_visit<expression>(a.arg, v, depth+1);
try_visit<type_id >(a.arg, v, depth+1);
}
v.end(template_args_tag{}, depth);
}
v.end(*this, depth);
}
};
struct qualified_id_node
{
struct term {
token const* scope_op;
std::unique_ptr<unqualified_id_node> id = {};
term( token const* o ) : scope_op{o} { }
};
std::vector<term> ids;
auto get_token() const
-> token const*
{
if (
std::ssize(ids) == 1
&& !ids.front().scope_op
)
{
assert (ids.front().id);
return ids.front().id->get_token();
}
// else
return {};
}
auto to_string() const
-> std::string
{
auto ret = std::string{};
for (auto& term : ids) {
if (term.scope_op) {
ret += term.scope_op->as_string_view();
}
assert (term.id);
ret += term.id->to_string();
}
return ret;
}
auto get_first_token() const
-> token const*
{
assert (
!ids.empty()
&& ids.front().id
);
return ids.front().id->get_token();
}
auto position() const
-> source_position
{
assert (!ids.empty());
if (ids.front().scope_op) {
return ids.front().scope_op->position();
}
else {
assert (ids.front().id);
return ids.front().id->position();
}
}
auto visit(auto& v, int depth)
-> void
{
v.start(*this, depth);
for (auto const& x : ids) {
if (x.scope_op) {
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