651 lines
28 KiB
C++
651 lines
28 KiB
C++
#include "types.h"
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#include "parsing.h"
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#include "tokens.h"
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namespace parsing {
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namespace {
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static uint32_t struct_id_counter = 0;
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Result<std::unique_ptr<AST::Expression>, std::string> parse_expression(token::TokenStream& stream, Scope& scope);
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Result<std::shared_ptr<types::Type>, std::string> parse_type(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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try {
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bool is_const = false;
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if (inner.peek().type == token::Type::Ident && inner.peek().content == "const") {
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is_const = true;
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}
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auto token = inner.expect(token::Type::Ident);
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std::shared_ptr<types::Type> returned{};
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if (token.content == "struct") {
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std::optional<std::string> struct_name{};
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if (inner.peek().type == token::Type::Ident) {
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struct_name = inner.expect(token::Type::Ident).content;
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}
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std::optional<std::vector<types::StructField>> maybe_fields{};
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if (inner.peek().content == "{") {
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std::vector<types::StructField> fields{};
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inner.expect(token::Type::Symbol, "{");
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int counter = 0;
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while (inner.peek().content != "}") {
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if (counter++ > 0)
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inner.expect(token::Type::Symbol, ";");
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auto ty = parse_type(inner, scope);
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if (!ty.ok())
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break;
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auto field_name = inner.expect(token::Type::Ident);
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fields.push_back(types::StructField{ field_name.content, ty.unwrap() });
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}
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inner.expect(token::Type::Symbol, "}");
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maybe_fields = fields;
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}
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if (!struct_name && !maybe_fields) {
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throw std::runtime_error("Struct must have a name or fields!");
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}
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if (struct_name && !maybe_fields && scope.structs.find(*struct_name) != scope.structs.end()) {
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auto original_ty = scope.structs[*struct_name];
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auto original_struct_ty = dynamic_cast<types::StructType*>(original_ty.get());
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auto ty = new types::StructType{
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is_const,
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struct_name,
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original_struct_ty->m_fields,
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true,
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false,
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original_struct_ty->m_id
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};
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returned = std::shared_ptr<types::Type>{ ty };
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}
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else {
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if (scope.structs.find(*struct_name) != scope.structs.end()) {
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auto original_ty = scope.structs[*struct_name];
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auto original_struct_ty = dynamic_cast<types::StructType*>(original_ty.get());
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if (!original_struct_ty->m_fields.has_value()) {
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auto ty = new types::StructType{
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is_const,
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struct_name,
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maybe_fields,
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false,
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true,
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original_struct_ty->m_id
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};
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returned = std::shared_ptr<types::Type>{ ty };
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}
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else {
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auto ty = new types::StructType{
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is_const,
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struct_name,
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maybe_fields,
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false,
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false,
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struct_id_counter++
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};
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returned = std::shared_ptr<types::Type>{ ty };
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}
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}
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else {
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auto ty = new types::StructType{
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is_const,
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struct_name,
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maybe_fields,
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false,
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false,
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struct_id_counter++
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};
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returned = std::shared_ptr<types::Type>{ ty };
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}
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}
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}
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else {
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// TODO eventually make this be potentially more than one word
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std::string type_name = token.content;
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if (type_name == "int") {
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auto ty = new types::FundamentalType{ is_const, types::FundamentalTypeKind::Int };
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returned = std::shared_ptr<types::Type>{ ty };
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}
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else if (type_name == "char") {
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auto ty = new types::FundamentalType{ is_const, types::FundamentalTypeKind::Char };
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returned = std::shared_ptr<types::Type>{ ty };
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}
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else if (type_name == "void") {
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auto ty = new types::FundamentalType{ is_const, types::FundamentalTypeKind::Void };
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returned = std::shared_ptr<types::Type>{ ty };
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}
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else {
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throw std::runtime_error("Expected type name, got " + type_name);
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}
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}
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while (inner.peek().type == token::Type::Symbol && inner.peek().content == "*") {
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inner.next();
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auto ptr_const = false;
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if (inner.peek().type == token::Type::Ident && inner.peek().content == "const") {
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inner.next();
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ptr_const = true;
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}
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auto ty = new types::PointerType{ ptr_const, std::move(returned) };
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returned = std::shared_ptr<types::Type>{ ty };
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}
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stream.m_position = inner.m_position;
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return returned;
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::optional<uint32_t>, std::string> parse_array_postfix(token::TokenStream& stream, bool allow_empty, Scope&) {
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token::TokenStream inner{ stream };
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try {
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std::optional<uint32_t> returned{};
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inner.expect(token::Type::Symbol, "[");
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if (inner.peek().type == token::Type::LiteralInt) {
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returned = std::stoi(inner.next().content);
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}
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if (!allow_empty && !returned.has_value()) {
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throw std::runtime_error("Expected array size");
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}
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inner.expect(token::Type::Symbol, "]");
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stream.m_position = inner.m_position;
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return returned;
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::unique_ptr<AST::Expression>, std::string> parse_list_initializer(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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try {
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auto before_meta = inner.metadata();
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inner.expect(token::Type::Symbol, "{");
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std::vector<std::unique_ptr<AST::Expression>> expressions{};
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int counter = 0;
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while (inner.peek().content != "}") {
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if (counter++ > 0) {
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inner.expect(token::Type::Symbol, ",");
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}
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expressions.push_back(parse_expression(inner, scope).unwrap());
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}
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inner.expect(token::Type::Symbol, "}");
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Expression> {
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new AST::ListInitializerExpression(
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before_meta + inner.metadata(),
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std::move(expressions),
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std::shared_ptr<types::Type> {
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new types::FundamentalType{ true, types::FundamentalTypeKind::Any }
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})
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};
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::unique_ptr<AST::Expression>, std::string> parse_plain_expression(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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try {
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if (auto list_init = parse_list_initializer(inner, scope); list_init.ok()) {
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Expression> { list_init.unwrap() };
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}
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auto token = inner.next();
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if (token.type == token::Type::LiteralInt) {
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stream.m_position = inner.m_position;
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auto expr = new AST::IntLiteralExpression{ token.metadata, std::stoi(token.content) };
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return std::unique_ptr<AST::Expression>{ expr };
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}
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else if (token.type == token::Type::LiteralStr) {
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stream.m_position = inner.m_position;
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auto expr = new AST::StringLiteralExpression{ token.metadata, token.content };
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return std::unique_ptr<AST::Expression>{ expr };
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}
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else if (token.type == token::Type::Ident) {
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stream.m_position = inner.m_position;
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auto expr = new AST::ValueReferenceExpression{ token.metadata, token.content };
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return std::unique_ptr<AST::Expression>{ expr };
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}
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else {
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throw std::runtime_error("Expected expression");
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}
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::shared_ptr<types::Type>, std::string> parse_cast(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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try {
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inner.expect(token::Type::Symbol, "(");
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auto ty = parse_type(inner, scope).unwrap();
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inner.expect(token::Type::Symbol, ")");
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stream.m_position = inner.m_position;
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return ty;
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::unique_ptr<AST::Expression>, std::string> parse_primary_expression(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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try {
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auto before_meta = inner.metadata();
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if (auto cast = parse_cast(inner, scope); cast.ok()) {
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auto expr = parse_primary_expression(inner, scope).unwrap();
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Expression>{
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new AST::CastExpression{
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before_meta + inner.metadata(),
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cast.unwrap(),
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std::move(expr)
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}
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};
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}
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else if (inner.peek().content == "(") {
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inner.next();
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auto expr = parse_expression(inner, scope).unwrap();
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inner.expect(token::Type::Symbol, ")");
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stream.m_position = inner.m_position;
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return expr;
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}
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else if (inner.peek().content == "&") {
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inner.next();
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auto expr = parse_primary_expression(inner, scope).unwrap();
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Expression> {
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new AST::RefExpression(before_meta + inner.metadata(), std::move(expr))
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};
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}
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else if (inner.peek().content == "*") {
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inner.next();
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auto expr = parse_primary_expression(inner, scope).unwrap();
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Expression> {
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new AST::DerefExpression(before_meta + inner.metadata(), std::move(expr))
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};
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}
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auto plain_expr = parse_plain_expression(inner, scope);
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while (inner.peek().content == "(" || inner.peek().content == "[" || inner.peek().content == ".") {
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if (inner.peek().content == "(") {
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inner.next();
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std::vector<std::unique_ptr<AST::Expression>> args{};
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int counter = 0;
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while (inner.peek().content != ")") {
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if (counter++ > 0)
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inner.expect(token::Type::Symbol, ",");
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args.push_back(parse_expression(inner, scope).unwrap());
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}
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inner.expect(token::Type::Symbol, ")");
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auto fn_call = new AST::FunctionCallExpression{ before_meta + inner.metadata(), plain_expr.unwrap(), std::move(args) };
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plain_expr = std::unique_ptr<AST::Expression>{ fn_call };
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}
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else if (auto postfix = parse_array_postfix(inner, false, scope); postfix.ok()) {
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auto idx_expr = new AST::IndexAccessExpression{
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before_meta + inner.metadata(), plain_expr.unwrap(), *postfix.unwrap() };
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plain_expr = std::unique_ptr<AST::Expression>{ idx_expr };
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}
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else if (inner.peek().content == ".") {
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inner.next();
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std::string field_name = inner.expect(token::Type::Ident).content;
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plain_expr = std::unique_ptr<AST::Expression>{
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new AST::FieldAccessExpression{before_meta + inner.metadata(), plain_expr.unwrap(), field_name}
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};
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}
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}
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stream.m_position = inner.m_position;
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return plain_expr;
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<types::BinOp, std::string> parse_binop(token::TokenStream& stream, Scope&) {
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token::TokenStream inner{ stream };
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try {
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auto token = inner.next();
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if (token.type != token::Type::Symbol) {
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throw std::runtime_error("Expected binop");
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}
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else if (token.content == "=") {
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stream.m_position = inner.m_position;
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return types::BinOp{ types::BinOp::Assignment };
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}
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else if (token.content == "+") {
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stream.m_position = inner.m_position;
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return types::BinOp{ types::BinOp::Add };
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}
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else if (token.content == "-") {
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stream.m_position = inner.m_position;
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return types::BinOp{ types::BinOp::Sub };
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}
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else if (token.content == "<") {
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stream.m_position = inner.m_position;
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return types::BinOp{ types::BinOp::LessThan };
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}
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else if (token.content == ">") {
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stream.m_position = inner.m_position;
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return types::BinOp{ types::BinOp::GreaterThan };
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}
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throw std::runtime_error("Expected binop");
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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std::unique_ptr<AST::Expression> parse_rhs(
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token::TokenStream& stream, std::unique_ptr<AST::Expression> lhs, int prev_precedence, Scope& scope) {
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auto before = stream.metadata();
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auto binop_res = parse_binop(stream, scope);
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while (binop_res.ok()) {
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auto binop = binop_res.unwrap();
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auto rhs = parse_primary_expression(stream, scope).unwrap();
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if (types::operator_precedence(binop) > prev_precedence) {
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rhs = parse_rhs(stream, std::move(rhs), types::operator_precedence(binop), scope);
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}
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auto binop_expr = new AST::BinaryOperationExpression{ before + stream.metadata(), std::move(lhs), binop, std::move(rhs) };
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lhs = std::unique_ptr<AST::Expression>{ binop_expr };
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binop_res = parse_binop(stream, scope);
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}
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return lhs;
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}
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Result<std::unique_ptr<AST::Expression>, std::string> parse_expression(token::TokenStream& stream, Scope& scope) {
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try {
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auto lhs = parse_primary_expression(stream, scope).unwrap();
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return std::unique_ptr{ parse_rhs(stream, std::move(lhs), 0, scope) };
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::unique_ptr<AST::InitializationStatement>, std::string> parse_init_statement(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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auto before_meta = inner.metadata();
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try {
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auto ty = parse_type(inner, scope).unwrap();
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auto name = inner.expect(token::Type::Ident);
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auto array_postfix = parse_array_postfix(inner, false, scope);
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while (array_postfix.ok()) {
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auto postfix = array_postfix.unwrap();
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ty = std::shared_ptr<types::Type>{
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new types::ArrayType(ty, *postfix, false)
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};
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array_postfix = parse_array_postfix(inner, false, scope);
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}
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std::optional<std::unique_ptr<AST::Expression>> expr = {};
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if (inner.peek().type == token::Type::Symbol && inner.peek().content == "=") {
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inner.expect(token::Type::Symbol, "=");
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expr = parse_expression(inner, scope).unwrap();
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}
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inner.expect(token::Type::Symbol, ";");
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stream.m_position = inner.m_position;
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auto init = new AST::InitializationStatement{ before_meta + inner.metadata(), std::move(ty), name.content, std::move(expr) };
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return std::unique_ptr<AST::InitializationStatement>{ init };
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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}
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Result<std::unique_ptr<AST::Statement>, std::string> parse_statement(token::TokenStream& stream, Scope& scope) {
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token::TokenStream inner{ stream };
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auto before_meta = inner.metadata();
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try {
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if (inner.peek().type == token::Type::ReturnKeyword) {
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inner.next();
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auto expression = parse_expression(inner, scope).unwrap();
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inner.expect(token::Type::Symbol, ";");
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stream.m_position = inner.m_position;
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auto ret = new AST::ReturnStatement{ before_meta + stream.metadata(),std::move(expression) };
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return std::unique_ptr<AST::Statement>{ ret };
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}
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else if (inner.peek().type == token::Type::IfKeyword) {
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inner.next();
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inner.expect(token::Type::Symbol, "(");
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auto expression = parse_expression(inner, scope).unwrap();
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inner.expect(token::Type::Symbol, ")");
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auto then_statement = parse_statement(inner, scope).unwrap();
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std::optional<std::unique_ptr<AST::Statement>> else_statement{};
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if (inner.peek().type == token::Type::ElseKeyword) {
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inner.next();
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else_statement = parse_statement(inner, scope).unwrap();
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}
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stream.m_position = inner.m_position;
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auto statement = new AST::IfStatement{
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before_meta + stream.metadata(),
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std::move(expression),
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std::move(then_statement),
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std::move(else_statement)
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};
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return std::unique_ptr<AST::Statement>{ statement };
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}
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else if (auto init = parse_init_statement(inner, scope); init.ok()) {
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stream.m_position = inner.m_position;
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return std::unique_ptr<AST::Statement>{ init.unwrap() };
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}
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else if (auto expr = parse_expression(inner, scope); expr.ok()) {
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stream.m_position = inner.m_position;
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stream.expect(token::Type::Symbol, ";");
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auto expr_statement = new AST::ExpressionStatement{ before_meta + stream.metadata(), expr.unwrap() };
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return std::unique_ptr<AST::Statement>{ expr_statement };
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}
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else {
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throw std::runtime_error("Expected return-keyword");
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}
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}
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catch (std::runtime_error& error) {
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return std::string{ error.what() };
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}
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|
}
|
|
}
|
|
|
|
Result<std::unique_ptr<AST::TopLevelStatement>, std::string> parse_function(token::TokenStream& stream, Scope& scope) {
|
|
token::TokenStream inner{ stream };
|
|
auto before_meta = inner.metadata();
|
|
try {
|
|
auto type = parse_type(inner, scope).unwrap();
|
|
auto name_token = inner.expect(token::Type::Ident);
|
|
inner.expect(token::Type::Symbol, "(");
|
|
|
|
std::vector<std::pair<std::optional<std::string>, std::shared_ptr<types::Type>>> params;
|
|
bool is_vararg = false;
|
|
while (inner.peek().content != ")") {
|
|
if (params.size() > 0) {
|
|
inner.expect(token::Type::Symbol, ",");
|
|
}
|
|
|
|
if (inner.peek().content == ".") {
|
|
inner.next();
|
|
inner.expect(token::Type::Symbol, ".");
|
|
inner.expect(token::Type::Symbol, ".");
|
|
is_vararg = true;
|
|
break;
|
|
}
|
|
|
|
auto param_ty = parse_type(inner, scope).unwrap();
|
|
std::optional<std::string> param_name{};
|
|
if (inner.peek().type == token::Type::Ident) {
|
|
param_name = inner.expect(token::Type::Ident).content;
|
|
|
|
auto postfix = parse_array_postfix(inner, true, scope);
|
|
while (postfix.ok()) {
|
|
auto array_postfix = postfix.unwrap();
|
|
if (array_postfix) {
|
|
param_ty = std::shared_ptr<types::Type>{
|
|
new types::ArrayType(param_ty, *array_postfix, false)
|
|
};
|
|
}
|
|
else {
|
|
param_ty = std::shared_ptr<types::Type>{
|
|
new types::PointerType(true, param_ty)
|
|
};
|
|
}
|
|
postfix = parse_array_postfix(inner, true, scope);
|
|
}
|
|
}
|
|
|
|
params.push_back(std::pair(param_name, std::move(param_ty)));
|
|
}
|
|
|
|
inner.expect(token::Type::Symbol, ")");
|
|
|
|
auto inner_scope = parsing::Scope{ scope };
|
|
|
|
std::optional<std::vector<std::unique_ptr<AST::Statement>>> statements{};
|
|
if (inner.peek().content == "{") {
|
|
inner.expect(token::Type::Symbol, "{");
|
|
|
|
std::vector<std::unique_ptr<AST::Statement>> statement_list{};
|
|
|
|
auto statement = parse_statement(inner, inner_scope);
|
|
while (statement.ok()) {
|
|
statement_list.push_back(statement.unwrap());
|
|
statement = parse_statement(inner, inner_scope);
|
|
}
|
|
|
|
statements = std::optional{ std::move(statement_list) };
|
|
inner.expect(token::Type::Symbol, "}");
|
|
}
|
|
else {
|
|
inner.expect(token::Type::Symbol, ";");
|
|
}
|
|
|
|
stream.m_position = inner.m_position;
|
|
|
|
auto fun = new AST::Function{
|
|
before_meta + stream.metadata(),
|
|
std::move(type),
|
|
std::move(params),
|
|
is_vararg,
|
|
name_token.content,
|
|
std::move(statements)
|
|
};
|
|
return std::unique_ptr<AST::TopLevelStatement>{ fun };
|
|
}
|
|
catch (std::runtime_error& error) {
|
|
return std::string(error.what());
|
|
}
|
|
}
|
|
|
|
Result<std::unique_ptr<AST::TopLevelStatement>, std::string> parse_tl_typedef(token::TokenStream& stream, Scope& scope) {
|
|
token::TokenStream inner{ stream };
|
|
auto before_meta = inner.metadata();
|
|
try {
|
|
auto ty = parse_type(inner, scope).unwrap();
|
|
inner.expect(token::Type::Symbol, ";");
|
|
|
|
if (ty->m_kind == types::TypeKind::Struct) {
|
|
auto struct_ty = dynamic_cast<types::StructType*>(ty.get());
|
|
if (!struct_ty->m_is_ref && struct_ty->m_name) {
|
|
if (scope.structs.find(*struct_ty->m_name) != scope.structs.end() && struct_ty->m_is_def) {
|
|
auto true_ty = dynamic_cast<types::StructType*>(scope.structs[*struct_ty->m_name].get());
|
|
true_ty->m_fields = struct_ty->m_fields;
|
|
}
|
|
else {
|
|
scope.structs[*struct_ty->m_name] = ty;
|
|
}
|
|
}
|
|
}
|
|
|
|
stream.m_position = inner.m_position;
|
|
auto tl_typedef = new AST::TopLevelTypedef{
|
|
before_meta + stream.metadata(), ty
|
|
};
|
|
return std::unique_ptr<AST::TopLevelStatement>{tl_typedef};
|
|
}
|
|
catch (std::runtime_error& error) {
|
|
return std::string(error.what());
|
|
}
|
|
}
|
|
|
|
Result<std::unique_ptr<AST::TopLevelStatement>, std::string> parse_top_level_statement(token::TokenStream& stream, Scope& scope) {
|
|
token::TokenStream inner{ stream };
|
|
auto before_meta = inner.metadata();
|
|
try {
|
|
if (auto func = parse_function(inner, scope); func.ok()) {
|
|
stream.m_position = inner.m_position;
|
|
return func.unwrap();
|
|
}
|
|
else if (auto tl_typedef = parse_tl_typedef(inner, scope); tl_typedef.ok()) {
|
|
stream.m_position = inner.m_position;
|
|
return tl_typedef.unwrap();
|
|
}
|
|
else {
|
|
throw std::runtime_error("Expected top-level statement, got " + inner.peek().formatted());
|
|
}
|
|
}
|
|
catch (std::runtime_error& error) {
|
|
return std::string(error.what());
|
|
}
|
|
}
|
|
} |