| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "stdio.h" |
| #include "SkSLParser.h" |
| #include "SkSLToken.h" |
| |
| #define register |
| #include "disable_flex_warnings.h" |
| #include "lex.sksl.c" |
| static_assert(YY_FLEX_MAJOR_VERSION * 10000 + YY_FLEX_MINOR_VERSION * 100 + |
| YY_FLEX_SUBMINOR_VERSION >= 20601, |
| "we require Flex 2.6.1 or better for security reasons"); |
| #undef register |
| #ifdef __clang__ |
| #pragma clang diagnostic pop |
| #endif |
| #ifdef __GNUC__ |
| #pragma GCC diagnostic pop |
| #endif |
| #ifdef _MSC_VER |
| #pragma warning(pop) |
| #endif |
| |
| #include "lex.layout.h" |
| #include "ast/SkSLASTBinaryExpression.h" |
| #include "ast/SkSLASTBlock.h" |
| #include "ast/SkSLASTBoolLiteral.h" |
| #include "ast/SkSLASTBreakStatement.h" |
| #include "ast/SkSLASTCallSuffix.h" |
| #include "ast/SkSLASTContinueStatement.h" |
| #include "ast/SkSLASTDiscardStatement.h" |
| #include "ast/SkSLASTDoStatement.h" |
| #include "ast/SkSLASTExpression.h" |
| #include "ast/SkSLASTExpressionStatement.h" |
| #include "ast/SkSLASTExtension.h" |
| #include "ast/SkSLASTFieldSuffix.h" |
| #include "ast/SkSLASTFloatLiteral.h" |
| #include "ast/SkSLASTForStatement.h" |
| #include "ast/SkSLASTFunction.h" |
| #include "ast/SkSLASTIdentifier.h" |
| #include "ast/SkSLASTIfStatement.h" |
| #include "ast/SkSLASTIndexSuffix.h" |
| #include "ast/SkSLASTInterfaceBlock.h" |
| #include "ast/SkSLASTIntLiteral.h" |
| #include "ast/SkSLASTModifiersDeclaration.h" |
| #include "ast/SkSLASTParameter.h" |
| #include "ast/SkSLASTPrecision.h" |
| #include "ast/SkSLASTPrefixExpression.h" |
| #include "ast/SkSLASTReturnStatement.h" |
| #include "ast/SkSLASTSection.h" |
| #include "ast/SkSLASTStatement.h" |
| #include "ast/SkSLASTSuffixExpression.h" |
| #include "ast/SkSLASTSwitchCase.h" |
| #include "ast/SkSLASTSwitchStatement.h" |
| #include "ast/SkSLASTTernaryExpression.h" |
| #include "ast/SkSLASTType.h" |
| #include "ast/SkSLASTVarDeclaration.h" |
| #include "ast/SkSLASTVarDeclarationStatement.h" |
| #include "ast/SkSLASTWhileStatement.h" |
| #include "ir/SkSLSymbolTable.h" |
| #include "ir/SkSLModifiers.h" |
| #include "ir/SkSLType.h" |
| |
| namespace SkSL { |
| |
| #define MAX_PARSE_DEPTH 50 |
| |
| class AutoDepth { |
| public: |
| AutoDepth(Parser* p) |
| : fParser(p) { |
| fParser->fDepth++; |
| } |
| |
| ~AutoDepth() { |
| fParser->fDepth--; |
| } |
| |
| bool checkValid() { |
| if (fParser->fDepth > MAX_PARSE_DEPTH) { |
| fParser->error(fParser->peek().fPosition, String("exceeded max parse depth")); |
| return false; |
| } |
| return true; |
| } |
| |
| private: |
| Parser* fParser; |
| }; |
| |
| Parser::Parser(String text, SymbolTable& types, ErrorReporter& errors) |
| : fPushback(Position(-1, -1), Token::INVALID_TOKEN, String()) |
| , fTypes(types) |
| , fErrors(errors) { |
| sksllex_init(&fScanner); |
| layoutlex_init(&fLayoutScanner); |
| fBuffer = sksl_scan_string(text.c_str(), fScanner); |
| skslset_lineno(1, fScanner); |
| } |
| |
| Parser::~Parser() { |
| sksl_delete_buffer(fBuffer, fScanner); |
| sksllex_destroy(fScanner); |
| layoutlex_destroy(fLayoutScanner); |
| } |
| |
| /* (precision | directive | section | declaration)* END_OF_FILE */ |
| std::vector<std::unique_ptr<ASTDeclaration>> Parser::file() { |
| std::vector<std::unique_ptr<ASTDeclaration>> result; |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::END_OF_FILE: |
| return result; |
| case Token::PRECISION: { |
| std::unique_ptr<ASTDeclaration> precision = this->precision(); |
| if (precision) { |
| result.push_back(std::move(precision)); |
| } |
| break; |
| } |
| case Token::DIRECTIVE: { |
| std::unique_ptr<ASTDeclaration> decl = this->directive(); |
| if (decl) { |
| result.push_back(std::move(decl)); |
| } |
| break; |
| } |
| case Token::SECTION: { |
| std::unique_ptr<ASTDeclaration> section = this->section(); |
| if (section) { |
| result.push_back(std::move(section)); |
| } |
| break; |
| } |
| default: { |
| std::unique_ptr<ASTDeclaration> decl = this->declaration(); |
| if (!decl) { |
| continue; |
| } |
| result.push_back(std::move(decl)); |
| } |
| } |
| } |
| } |
| |
| Token Parser::nextRawToken() { |
| if (fPushback.fKind != Token::INVALID_TOKEN) { |
| Token result = fPushback; |
| fPushback.fKind = Token::INVALID_TOKEN; |
| fPushback.fText = ""; |
| return result; |
| } |
| int token = sksllex(fScanner); |
| return Token(Position(skslget_lineno(fScanner), -1), (Token::Kind) token, |
| String(skslget_text(fScanner))); |
| } |
| |
| Token Parser::nextToken() { |
| Token token; |
| do { |
| token = this->nextRawToken(); |
| } while (token.fKind == Token::WHITESPACE); |
| return token; |
| } |
| |
| void Parser::pushback(Token t) { |
| ASSERT(fPushback.fKind == Token::INVALID_TOKEN); |
| fPushback = t; |
| } |
| |
| Token Parser::peek() { |
| fPushback = this->nextToken(); |
| return fPushback; |
| } |
| |
| bool Parser::checkNext(Token::Kind kind, Token* result) { |
| Token next = this->nextToken(); |
| if (next.fKind == kind) { |
| if (result) { |
| *result = next; |
| } |
| return true; |
| } |
| this->pushback(next); |
| return false; |
| } |
| |
| bool Parser::expect(Token::Kind kind, const char* expected, Token* result) { |
| return this->expect(kind, String(expected), result); |
| } |
| |
| bool Parser::expect(Token::Kind kind, String expected, Token* result) { |
| Token next = this->nextToken(); |
| if (next.fKind == kind) { |
| if (result) { |
| *result = next; |
| } |
| return true; |
| } else { |
| if (next.fText.size()) { |
| this->error(next.fPosition, "expected " + expected + ", but found '" + next.fText + |
| "'"); |
| } else { |
| this->error(next.fPosition, "parse error, recompile in debug mode for details"); |
| } |
| return false; |
| } |
| } |
| |
| void Parser::error(Position p, const char* msg) { |
| this->error(p, String(msg)); |
| } |
| |
| void Parser::error(Position p, String msg) { |
| fErrors.error(p, msg); |
| } |
| |
| bool Parser::isType(String name) { |
| return nullptr != fTypes[name]; |
| } |
| |
| /* PRECISION (LOWP | MEDIUMP | HIGHP) type SEMICOLON */ |
| std::unique_ptr<ASTDeclaration> Parser::precision() { |
| if (!this->expect(Token::PRECISION, "'precision'")) { |
| return nullptr; |
| } |
| Modifiers::Flag result; |
| Token p = this->nextToken(); |
| switch (p.fKind) { |
| case Token::LOWP: |
| result = Modifiers::kLowp_Flag; |
| break; |
| case Token::MEDIUMP: |
| result = Modifiers::kMediump_Flag; |
| break; |
| case Token::HIGHP: |
| result = Modifiers::kHighp_Flag; |
| break; |
| default: |
| this->error(p.fPosition, "expected 'lowp', 'mediump', or 'highp', but found '" + |
| p.fText + "'"); |
| return nullptr; |
| } |
| // FIXME handle the type |
| if (!this->type()) { |
| return nullptr; |
| } |
| this->expect(Token::SEMICOLON, "';'"); |
| return std::unique_ptr<ASTDeclaration>(new ASTPrecision(p.fPosition, result)); |
| } |
| |
| /* DIRECTIVE(#version) INT_LITERAL ("es" | "compatibility")? | |
| DIRECTIVE(#extension) IDENTIFIER COLON IDENTIFIER */ |
| std::unique_ptr<ASTDeclaration> Parser::directive() { |
| Token start; |
| if (!this->expect(Token::DIRECTIVE, "a directive", &start)) { |
| return nullptr; |
| } |
| if (start.fText == "#version") { |
| this->expect(Token::INT_LITERAL, "a version number"); |
| Token next = this->peek(); |
| if (next.fText == "es" || next.fText == "compatibility") { |
| this->nextToken(); |
| } |
| // version is ignored for now; it will eventually become an error when we stop pretending |
| // to be GLSL |
| return nullptr; |
| } else if (start.fText == "#extension") { |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::COLON, "':'")) { |
| return nullptr; |
| } |
| // FIXME: need to start paying attention to this token |
| if (!this->expect(Token::IDENTIFIER, "an identifier")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTDeclaration>(new ASTExtension(start.fPosition, |
| std::move(name.fText))); |
| } else { |
| this->error(start.fPosition, "unsupported directive '" + start.fText + "'"); |
| return nullptr; |
| } |
| } |
| |
| /* SECTION LBRACE (LPAREN IDENTIFIER RPAREN)? <any sequence of tokens with balanced braces> |
| RBRACE */ |
| std::unique_ptr<ASTDeclaration> Parser::section() { |
| Token start; |
| if (!this->expect(Token::SECTION, "a section token", &start)) { |
| return nullptr; |
| } |
| String argument; |
| if (this->peek().fKind == Token::LPAREN) { |
| this->nextToken(); |
| Token argToken; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &argToken)) { |
| return nullptr; |
| } |
| argument = argToken.fText; |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| } |
| if (!this->expect(Token::LBRACE, "'{'")) { |
| return nullptr; |
| } |
| String text; |
| int level = 1; |
| for (;;) { |
| Token next = this->nextRawToken(); |
| switch (next.fKind) { |
| case Token::LBRACE: |
| ++level; |
| break; |
| case Token::RBRACE: |
| --level; |
| break; |
| case Token::END_OF_FILE: |
| this->error(start.fPosition, "reached end of file while parsing section"); |
| return nullptr; |
| default: |
| break; |
| } |
| if (!level) { |
| break; |
| } |
| text += next.fText; |
| } |
| return std::unique_ptr<ASTDeclaration>(new ASTSection(start.fPosition, |
| String(start.fText.c_str() + 1), |
| argument, |
| text)); |
| } |
| |
| /* modifiers (structVarDeclaration | type IDENTIFIER ((LPAREN parameter |
| (COMMA parameter)* RPAREN (block | SEMICOLON)) | SEMICOLON) | interfaceBlock) */ |
| std::unique_ptr<ASTDeclaration> Parser::declaration() { |
| Modifiers modifiers = this->modifiers(); |
| Token lookahead = this->peek(); |
| if (lookahead.fKind == Token::IDENTIFIER && !this->isType(lookahead.fText)) { |
| // we have an identifier that's not a type, could be the start of an interface block |
| return this->interfaceBlock(modifiers); |
| } |
| if (lookahead.fKind == Token::STRUCT) { |
| return this->structVarDeclaration(modifiers); |
| } |
| if (lookahead.fKind == Token::SEMICOLON) { |
| this->nextToken(); |
| return std::unique_ptr<ASTDeclaration>(new ASTModifiersDeclaration(modifiers)); |
| } |
| std::unique_ptr<ASTType> type(this->type()); |
| if (!type) { |
| return nullptr; |
| } |
| if (type->fKind == ASTType::kStruct_Kind && this->checkNext(Token::SEMICOLON)) { |
| return nullptr; |
| } |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| if (this->checkNext(Token::LPAREN)) { |
| std::vector<std::unique_ptr<ASTParameter>> parameters; |
| while (this->peek().fKind != Token::RPAREN) { |
| if (parameters.size() > 0) { |
| if (!this->expect(Token::COMMA, "','")) { |
| return nullptr; |
| } |
| } |
| std::unique_ptr<ASTParameter> parameter = this->parameter(); |
| if (!parameter) { |
| return nullptr; |
| } |
| parameters.push_back(std::move(parameter)); |
| } |
| this->nextToken(); |
| std::unique_ptr<ASTBlock> body; |
| if (!this->checkNext(Token::SEMICOLON)) { |
| body = this->block(); |
| if (!body) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<ASTDeclaration>(new ASTFunction(name.fPosition, |
| modifiers, |
| std::move(type), |
| std::move(name.fText), |
| std::move(parameters), |
| std::move(body))); |
| } else { |
| return this->varDeclarationEnd(modifiers, std::move(type), name.fText); |
| } |
| } |
| |
| /* modifiers type IDENTIFIER varDeclarationEnd */ |
| std::unique_ptr<ASTVarDeclarations> Parser::varDeclarations() { |
| Modifiers modifiers = this->modifiers(); |
| std::unique_ptr<ASTType> type(this->type()); |
| if (!type) { |
| return nullptr; |
| } |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| return this->varDeclarationEnd(modifiers, std::move(type), std::move(name.fText)); |
| } |
| |
| /* STRUCT IDENTIFIER LBRACE varDeclaration* RBRACE */ |
| std::unique_ptr<ASTType> Parser::structDeclaration() { |
| if (!this->expect(Token::STRUCT, "'struct'")) { |
| return nullptr; |
| } |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LBRACE, "'{'")) { |
| return nullptr; |
| } |
| std::vector<Type::Field> fields; |
| while (this->peek().fKind != Token::RBRACE) { |
| std::unique_ptr<ASTVarDeclarations> decl = this->varDeclarations(); |
| if (!decl) { |
| return nullptr; |
| } |
| for (const auto& var : decl->fVars) { |
| auto type = (const Type*) fTypes[decl->fType->fName]; |
| for (int i = (int) var.fSizes.size() - 1; i >= 0; i--) { |
| if (!var.fSizes[i] || var.fSizes[i]->fKind != ASTExpression::kInt_Kind) { |
| this->error(decl->fPosition, "array size in struct field must be a constant"); |
| return nullptr; |
| } |
| uint64_t columns = ((ASTIntLiteral&) *var.fSizes[i]).fValue; |
| String name = type->name() + "[" + to_string(columns) + "]"; |
| type = new Type(name, Type::kArray_Kind, *type, (int) columns); |
| fTypes.takeOwnership((Type*) type); |
| } |
| fields.push_back(Type::Field(decl->fModifiers, var.fName, type)); |
| if (var.fValue) { |
| this->error(decl->fPosition, "initializers are not permitted on struct fields"); |
| } |
| } |
| } |
| if (!this->expect(Token::RBRACE, "'}'")) { |
| return nullptr; |
| } |
| fTypes.add(name.fText, std::unique_ptr<Type>(new Type(name.fPosition, name.fText, fields))); |
| return std::unique_ptr<ASTType>(new ASTType(name.fPosition, name.fText, |
| ASTType::kStruct_Kind, std::vector<int>())); |
| } |
| |
| /* structDeclaration ((IDENTIFIER varDeclarationEnd) | SEMICOLON) */ |
| std::unique_ptr<ASTVarDeclarations> Parser::structVarDeclaration(Modifiers modifiers) { |
| std::unique_ptr<ASTType> type = this->structDeclaration(); |
| if (!type) { |
| return nullptr; |
| } |
| Token name; |
| if (this->checkNext(Token::IDENTIFIER, &name)) { |
| std::unique_ptr<ASTVarDeclarations> result = this->varDeclarationEnd(modifiers, |
| std::move(type), |
| std::move(name.fText)); |
| if (result) { |
| for (const auto& var : result->fVars) { |
| if (var.fValue) { |
| this->error(var.fValue->fPosition, |
| "struct variables cannot be initialized"); |
| } |
| } |
| } |
| return result; |
| } |
| this->expect(Token::SEMICOLON, "';'"); |
| return nullptr; |
| } |
| |
| /* (LBRACKET expression? RBRACKET)* (EQ assignmentExpression)? (COMMA IDENTIFER |
| (LBRACKET expression? RBRACKET)* (EQ assignmentExpression)?)* SEMICOLON */ |
| std::unique_ptr<ASTVarDeclarations> Parser::varDeclarationEnd(Modifiers mods, |
| std::unique_ptr<ASTType> type, |
| String name) { |
| std::vector<ASTVarDeclaration> vars; |
| std::vector<std::unique_ptr<ASTExpression>> currentVarSizes; |
| while (this->checkNext(Token::LBRACKET)) { |
| if (this->checkNext(Token::RBRACKET)) { |
| currentVarSizes.push_back(nullptr); |
| } else { |
| std::unique_ptr<ASTExpression> size(this->expression()); |
| if (!size) { |
| return nullptr; |
| } |
| currentVarSizes.push_back(std::move(size)); |
| if (!this->expect(Token::RBRACKET, "']'")) { |
| return nullptr; |
| } |
| } |
| } |
| std::unique_ptr<ASTExpression> value; |
| if (this->checkNext(Token::EQ)) { |
| value = this->assignmentExpression(); |
| if (!value) { |
| return nullptr; |
| } |
| } |
| vars.emplace_back(std::move(name), std::move(currentVarSizes), std::move(value)); |
| while (this->checkNext(Token::COMMA)) { |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| currentVarSizes.clear(); |
| value.reset(); |
| while (this->checkNext(Token::LBRACKET)) { |
| if (this->checkNext(Token::RBRACKET)) { |
| currentVarSizes.push_back(nullptr); |
| } else { |
| std::unique_ptr<ASTExpression> size(this->expression()); |
| if (!size) { |
| return nullptr; |
| } |
| currentVarSizes.push_back(std::move(size)); |
| if (!this->expect(Token::RBRACKET, "']'")) { |
| return nullptr; |
| } |
| } |
| } |
| if (this->checkNext(Token::EQ)) { |
| value = this->assignmentExpression(); |
| if (!value) { |
| return nullptr; |
| } |
| } |
| vars.emplace_back(std::move(name.fText), std::move(currentVarSizes), std::move(value)); |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTVarDeclarations>(new ASTVarDeclarations(std::move(mods), |
| std::move(type), |
| std::move(vars))); |
| } |
| |
| /* modifiers type IDENTIFIER (LBRACKET INT_LITERAL RBRACKET)? */ |
| std::unique_ptr<ASTParameter> Parser::parameter() { |
| Modifiers modifiers = this->modifiersWithDefaults(0); |
| std::unique_ptr<ASTType> type = this->type(); |
| if (!type) { |
| return nullptr; |
| } |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| std::vector<int> sizes; |
| while (this->checkNext(Token::LBRACKET)) { |
| Token sizeToken; |
| if (!this->expect(Token::INT_LITERAL, "a positive integer", &sizeToken)) { |
| return nullptr; |
| } |
| sizes.push_back(SkSL::stoi(sizeToken.fText)); |
| if (!this->expect(Token::RBRACKET, "']'")) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<ASTParameter>(new ASTParameter(name.fPosition, modifiers, |
| std::move(type), name.fText, |
| std::move(sizes))); |
| } |
| |
| /** (EQ INT_LITERAL)? */ |
| int Parser::layoutInt() { |
| if (!this->expect(Token::EQ, "'='")) { |
| return -1; |
| } |
| Token resultToken; |
| if (this->expect(Token::INT_LITERAL, "a non-negative integer", &resultToken)) { |
| return SkSL::stoi(resultToken.fText); |
| } |
| return -1; |
| } |
| |
| /** EQ <any sequence of tokens with balanced parentheses and no top-level comma> */ |
| String Parser::layoutCode() { |
| if (!this->expect(Token::EQ, "'='")) { |
| return ""; |
| } |
| Token start = this->peek(); |
| String code; |
| int level = 1; |
| bool done = false; |
| while (!done) { |
| Token next = this->peek(); |
| switch (next.fKind) { |
| case Token::LPAREN: |
| ++level; |
| break; |
| case Token::RPAREN: |
| --level; |
| break; |
| case Token::COMMA: |
| if (level == 1) { |
| done = true; |
| } |
| break; |
| case Token::END_OF_FILE: |
| this->error(start.fPosition, "reached end of file while parsing layout"); |
| return nullptr; |
| default: |
| break; |
| } |
| if (!level) { |
| done = true; |
| } |
| if (!done) { |
| code += this->nextRawToken().fText; |
| } |
| } |
| return code; |
| } |
| |
| /** (EQ IDENTIFIER('identity'))? */ |
| Layout::Key Parser::layoutKey() { |
| if (this->peek().fKind == Token::EQ) { |
| this->expect(Token::EQ, "'='"); |
| Token key; |
| if (this->expect(Token::IDENTIFIER, "an identifer", &key)) { |
| if (key.fText == "identity") { |
| return Layout::kIdentity_Key; |
| } else { |
| this->error(key.fPosition, "unsupported layout key"); |
| } |
| } |
| } |
| return Layout::kKey_Key; |
| } |
| |
| /* LAYOUT LPAREN IDENTIFIER (EQ INT_LITERAL)? (COMMA IDENTIFIER (EQ INT_LITERAL)?)* RPAREN */ |
| Layout Parser::layout() { |
| int location = -1; |
| int offset = -1; |
| int binding = -1; |
| int index = -1; |
| int set = -1; |
| int builtin = -1; |
| int inputAttachmentIndex = -1; |
| bool originUpperLeft = false; |
| bool overrideCoverage = false; |
| bool blendSupportAllEquations = false; |
| Layout::Format format = Layout::Format::kUnspecified; |
| bool pushConstant = false; |
| Layout::Primitive primitive = Layout::kUnspecified_Primitive; |
| int maxVertices = -1; |
| int invocations = -1; |
| String when; |
| Layout::Key key = Layout::kNo_Key; |
| if (this->checkNext(Token::LAYOUT)) { |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return Layout(location, offset, binding, index, set, builtin, inputAttachmentIndex, |
| originUpperLeft, overrideCoverage, blendSupportAllEquations, format, |
| pushConstant, primitive, maxVertices, invocations, when, key); |
| } |
| for (;;) { |
| Token t = this->nextToken(); |
| YY_BUFFER_STATE buffer; |
| buffer = layout_scan_string(t.fText.c_str(), fLayoutScanner); |
| int token = layoutlex(fLayoutScanner); |
| layout_delete_buffer(buffer, fLayoutScanner); |
| if (token != Token::INVALID_TOKEN) { |
| switch (token) { |
| case Token::LOCATION: |
| location = this->layoutInt(); |
| break; |
| case Token::OFFSET: |
| offset = this->layoutInt(); |
| break; |
| case Token::BINDING: |
| binding = this->layoutInt(); |
| break; |
| case Token::INDEX: |
| index = this->layoutInt(); |
| break; |
| case Token::SET: |
| set = this->layoutInt(); |
| break; |
| case Token::BUILTIN: |
| builtin = this->layoutInt(); |
| break; |
| case Token::INPUT_ATTACHMENT_INDEX: |
| inputAttachmentIndex = this->layoutInt(); |
| break; |
| case Token::ORIGIN_UPPER_LEFT: |
| originUpperLeft = true; |
| break; |
| case Token::OVERRIDE_COVERAGE: |
| overrideCoverage = true; |
| break; |
| case Token::BLEND_SUPPORT_ALL_EQUATIONS: |
| blendSupportAllEquations = true; |
| break; |
| case Token::PUSH_CONSTANT: |
| pushConstant = true; |
| break; |
| case Token::POINTS: |
| primitive = Layout::kPoints_Primitive; |
| break; |
| case Token::LINES: |
| primitive = Layout::kLines_Primitive; |
| break; |
| case Token::LINE_STRIP: |
| primitive = Layout::kLineStrip_Primitive; |
| break; |
| case Token::LINES_ADJACENCY: |
| primitive = Layout::kLinesAdjacency_Primitive; |
| break; |
| case Token::TRIANGLES: |
| primitive = Layout::kTriangles_Primitive; |
| break; |
| case Token::TRIANGLE_STRIP: |
| primitive = Layout::kTriangleStrip_Primitive; |
| break; |
| case Token::TRIANGLES_ADJACENCY: |
| primitive = Layout::kTrianglesAdjacency_Primitive; |
| break; |
| case Token::MAX_VERTICES: |
| maxVertices = this->layoutInt(); |
| break; |
| case Token::INVOCATIONS: |
| invocations = this->layoutInt(); |
| break; |
| case Token::WHEN: |
| when = this->layoutCode(); |
| break; |
| case Token::KEY: |
| key = this->layoutKey(); |
| break; |
| } |
| } else if (Layout::ReadFormat(t.fText, &format)) { |
| // AST::ReadFormat stored the result in 'format'. |
| } else { |
| this->error(t.fPosition, ("'" + t.fText + |
| "' is not a valid layout qualifier").c_str()); |
| } |
| if (this->checkNext(Token::RPAREN)) { |
| break; |
| } |
| if (!this->expect(Token::COMMA, "','")) { |
| break; |
| } |
| } |
| } |
| return Layout(location, offset, binding, index, set, builtin, inputAttachmentIndex, |
| originUpperLeft, overrideCoverage, blendSupportAllEquations, format, |
| pushConstant, primitive, maxVertices, invocations, when, key); |
| } |
| |
| /* layout? (UNIFORM | CONST | IN | OUT | INOUT | LOWP | MEDIUMP | HIGHP | FLAT | NOPERSPECTIVE | |
| READONLY | WRITEONLY | COHERENT | VOLATILE | RESTRICT | BUFFER)* */ |
| Modifiers Parser::modifiers() { |
| Layout layout = this->layout(); |
| int flags = 0; |
| for (;;) { |
| // TODO: handle duplicate / incompatible flags |
| switch (peek().fKind) { |
| case Token::UNIFORM: |
| this->nextToken(); |
| flags |= Modifiers::kUniform_Flag; |
| break; |
| case Token::CONST: |
| this->nextToken(); |
| flags |= Modifiers::kConst_Flag; |
| break; |
| case Token::IN: |
| this->nextToken(); |
| flags |= Modifiers::kIn_Flag; |
| break; |
| case Token::OUT: |
| this->nextToken(); |
| flags |= Modifiers::kOut_Flag; |
| break; |
| case Token::INOUT: |
| this->nextToken(); |
| flags |= Modifiers::kIn_Flag; |
| flags |= Modifiers::kOut_Flag; |
| break; |
| case Token::LOWP: |
| this->nextToken(); |
| flags |= Modifiers::kLowp_Flag; |
| break; |
| case Token::MEDIUMP: |
| this->nextToken(); |
| flags |= Modifiers::kMediump_Flag; |
| break; |
| case Token::HIGHP: |
| this->nextToken(); |
| flags |= Modifiers::kHighp_Flag; |
| break; |
| case Token::FLAT: |
| this->nextToken(); |
| flags |= Modifiers::kFlat_Flag; |
| break; |
| case Token::NOPERSPECTIVE: |
| this->nextToken(); |
| flags |= Modifiers::kNoPerspective_Flag; |
| break; |
| case Token::READONLY: |
| this->nextToken(); |
| flags |= Modifiers::kReadOnly_Flag; |
| break; |
| case Token::WRITEONLY: |
| this->nextToken(); |
| flags |= Modifiers::kWriteOnly_Flag; |
| break; |
| case Token::COHERENT: |
| this->nextToken(); |
| flags |= Modifiers::kCoherent_Flag; |
| break; |
| case Token::VOLATILE: |
| this->nextToken(); |
| flags |= Modifiers::kVolatile_Flag; |
| break; |
| case Token::RESTRICT: |
| this->nextToken(); |
| flags |= Modifiers::kRestrict_Flag; |
| break; |
| case Token::BUFFER: |
| this->nextToken(); |
| flags |= Modifiers::kBuffer_Flag; |
| break; |
| case Token::HASSIDEEFFECTS: |
| this->nextToken(); |
| flags |= Modifiers::kHasSideEffects_Flag; |
| break; |
| default: |
| return Modifiers(layout, flags); |
| } |
| } |
| } |
| |
| Modifiers Parser::modifiersWithDefaults(int defaultFlags) { |
| Modifiers result = this->modifiers(); |
| if (!result.fFlags) { |
| return Modifiers(result.fLayout, defaultFlags); |
| } |
| return result; |
| } |
| |
| /* ifStatement | forStatement | doStatement | whileStatement | block | expression */ |
| std::unique_ptr<ASTStatement> Parser::statement() { |
| Token start = this->peek(); |
| switch (start.fKind) { |
| case Token::IF: // fall through |
| case Token::STATIC_IF: |
| return this->ifStatement(); |
| case Token::FOR: |
| return this->forStatement(); |
| case Token::DO: |
| return this->doStatement(); |
| case Token::WHILE: |
| return this->whileStatement(); |
| case Token::SWITCH: // fall through |
| case Token::STATIC_SWITCH: |
| return this->switchStatement(); |
| case Token::RETURN: |
| return this->returnStatement(); |
| case Token::BREAK: |
| return this->breakStatement(); |
| case Token::CONTINUE: |
| return this->continueStatement(); |
| case Token::DISCARD: |
| return this->discardStatement(); |
| case Token::LBRACE: |
| return this->block(); |
| case Token::SEMICOLON: |
| this->nextToken(); |
| return std::unique_ptr<ASTStatement>(new ASTBlock(start.fPosition, |
| std::vector<std::unique_ptr<ASTStatement>>())); |
| case Token::CONST: // fall through |
| case Token::HIGHP: // fall through |
| case Token::MEDIUMP: // fall through |
| case Token::LOWP: { |
| auto decl = this->varDeclarations(); |
| if (!decl) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTStatement>(new ASTVarDeclarationStatement(std::move(decl))); |
| } |
| case Token::IDENTIFIER: |
| if (this->isType(start.fText)) { |
| auto decl = this->varDeclarations(); |
| if (!decl) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTStatement>(new ASTVarDeclarationStatement( |
| std::move(decl))); |
| } |
| // fall through |
| default: |
| return this->expressionStatement(); |
| } |
| } |
| |
| /* IDENTIFIER(type) (LBRACKET intLiteral? RBRACKET)* */ |
| std::unique_ptr<ASTType> Parser::type() { |
| Token type; |
| if (!this->expect(Token::IDENTIFIER, "a type", &type)) { |
| return nullptr; |
| } |
| if (!this->isType(type.fText)) { |
| this->error(type.fPosition, ("no type named '" + type.fText + "'").c_str()); |
| return nullptr; |
| } |
| std::vector<int> sizes; |
| while (this->checkNext(Token::LBRACKET)) { |
| if (this->peek().fKind != Token::RBRACKET) { |
| int64_t i; |
| if (this->intLiteral(&i)) { |
| sizes.push_back(i); |
| } else { |
| return nullptr; |
| } |
| } else { |
| sizes.push_back(-1); |
| } |
| this->expect(Token::RBRACKET, "']'"); |
| } |
| return std::unique_ptr<ASTType>(new ASTType(type.fPosition, std::move(type.fText), |
| ASTType::kIdentifier_Kind, sizes)); |
| } |
| |
| /* IDENTIFIER LBRACE varDeclaration* RBRACE (IDENTIFIER (LBRACKET expression? RBRACKET)*)? */ |
| std::unique_ptr<ASTDeclaration> Parser::interfaceBlock(Modifiers mods) { |
| Token name; |
| if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) { |
| return nullptr; |
| } |
| if (peek().fKind != Token::LBRACE) { |
| // we only get into interfaceBlock if we found a top-level identifier which was not a type. |
| // 99% of the time, the user was not actually intending to create an interface block, so |
| // it's better to report it as an unknown type |
| this->error(name.fPosition, "no type named '" + name.fText + "'"); |
| return nullptr; |
| } |
| this->nextToken(); |
| std::vector<std::unique_ptr<ASTVarDeclarations>> decls; |
| while (this->peek().fKind != Token::RBRACE) { |
| std::unique_ptr<ASTVarDeclarations> decl = this->varDeclarations(); |
| if (!decl) { |
| return nullptr; |
| } |
| decls.push_back(std::move(decl)); |
| } |
| this->nextToken(); |
| std::vector<std::unique_ptr<ASTExpression>> sizes; |
| Token instanceName; |
| if (this->checkNext(Token::IDENTIFIER, &instanceName)) { |
| while (this->checkNext(Token::LBRACKET)) { |
| if (this->peek().fKind != Token::RBRACKET) { |
| std::unique_ptr<ASTExpression> size = this->expression(); |
| if (!size) { |
| return nullptr; |
| } |
| sizes.push_back(std::move(size)); |
| } else { |
| sizes.push_back(nullptr); |
| } |
| this->expect(Token::RBRACKET, "']'"); |
| } |
| } |
| this->expect(Token::SEMICOLON, "';'"); |
| return std::unique_ptr<ASTDeclaration>(new ASTInterfaceBlock(name.fPosition, mods, |
| name.fText, std::move(decls), |
| std::move(instanceName.fText), |
| std::move(sizes))); |
| } |
| |
| /* IF LPAREN expression RPAREN statement (ELSE statement)? */ |
| std::unique_ptr<ASTIfStatement> Parser::ifStatement() { |
| Token start; |
| bool isStatic = this->checkNext(Token::STATIC_IF, &start); |
| if (!isStatic && !this->expect(Token::IF, "'if'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> test(this->expression()); |
| if (!test) { |
| return nullptr; |
| } |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> ifTrue(this->statement()); |
| if (!ifTrue) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> ifFalse; |
| if (this->checkNext(Token::ELSE)) { |
| ifFalse = this->statement(); |
| if (!ifFalse) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<ASTIfStatement>(new ASTIfStatement(start.fPosition, |
| isStatic, |
| std::move(test), |
| std::move(ifTrue), |
| std::move(ifFalse))); |
| } |
| |
| /* DO statement WHILE LPAREN expression RPAREN SEMICOLON */ |
| std::unique_ptr<ASTDoStatement> Parser::doStatement() { |
| Token start; |
| if (!this->expect(Token::DO, "'do'", &start)) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> statement(this->statement()); |
| if (!statement) { |
| return nullptr; |
| } |
| if (!this->expect(Token::WHILE, "'while'")) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> test(this->expression()); |
| if (!test) { |
| return nullptr; |
| } |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTDoStatement>(new ASTDoStatement(start.fPosition, |
| std::move(statement), |
| std::move(test))); |
| } |
| |
| /* WHILE LPAREN expression RPAREN STATEMENT */ |
| std::unique_ptr<ASTWhileStatement> Parser::whileStatement() { |
| Token start; |
| if (!this->expect(Token::WHILE, "'while'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> test(this->expression()); |
| if (!test) { |
| return nullptr; |
| } |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> statement(this->statement()); |
| if (!statement) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTWhileStatement>(new ASTWhileStatement(start.fPosition, |
| std::move(test), |
| std::move(statement))); |
| } |
| |
| /* CASE expression COLON statement* */ |
| std::unique_ptr<ASTSwitchCase> Parser::switchCase() { |
| Token start; |
| if (!this->expect(Token::CASE, "'case'", &start)) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> value = this->expression(); |
| if (!value) { |
| return nullptr; |
| } |
| if (!this->expect(Token::COLON, "':'")) { |
| return nullptr; |
| } |
| std::vector<std::unique_ptr<ASTStatement>> statements; |
| while (this->peek().fKind != Token::RBRACE && this->peek().fKind != Token::CASE && |
| this->peek().fKind != Token::DEFAULT) { |
| std::unique_ptr<ASTStatement> s = this->statement(); |
| if (!s) { |
| return nullptr; |
| } |
| statements.push_back(std::move(s)); |
| } |
| return std::unique_ptr<ASTSwitchCase>(new ASTSwitchCase(start.fPosition, std::move(value), |
| std::move(statements))); |
| } |
| |
| /* SWITCH LPAREN expression RPAREN LBRACE switchCase* (DEFAULT COLON statement*)? RBRACE */ |
| std::unique_ptr<ASTStatement> Parser::switchStatement() { |
| Token start; |
| bool isStatic = this->checkNext(Token::STATIC_SWITCH, &start); |
| if (!isStatic && !this->expect(Token::SWITCH, "'switch'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> value(this->expression()); |
| if (!value) { |
| return nullptr; |
| } |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LBRACE, "'{'")) { |
| return nullptr; |
| } |
| std::vector<std::unique_ptr<ASTSwitchCase>> cases; |
| while (this->peek().fKind == Token::CASE) { |
| std::unique_ptr<ASTSwitchCase> c = this->switchCase(); |
| if (!c) { |
| return nullptr; |
| } |
| cases.push_back(std::move(c)); |
| } |
| // Requiring default: to be last (in defiance of C and GLSL) was a deliberate decision. Other |
| // parts of the compiler may rely upon this assumption. |
| if (this->peek().fKind == Token::DEFAULT) { |
| Token defaultStart; |
| ASSERT_RESULT(this->expect(Token::DEFAULT, "'default'", &defaultStart)); |
| if (!this->expect(Token::COLON, "':'")) { |
| return nullptr; |
| } |
| std::vector<std::unique_ptr<ASTStatement>> statements; |
| while (this->peek().fKind != Token::RBRACE) { |
| std::unique_ptr<ASTStatement> s = this->statement(); |
| if (!s) { |
| return nullptr; |
| } |
| statements.push_back(std::move(s)); |
| } |
| cases.emplace_back(new ASTSwitchCase(defaultStart.fPosition, nullptr, |
| std::move(statements))); |
| } |
| if (!this->expect(Token::RBRACE, "'}'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTStatement>(new ASTSwitchStatement(start.fPosition, |
| isStatic, |
| std::move(value), |
| std::move(cases))); |
| } |
| |
| /* FOR LPAREN (declaration | expression)? SEMICOLON expression? SEMICOLON expression? RPAREN |
| STATEMENT */ |
| std::unique_ptr<ASTForStatement> Parser::forStatement() { |
| Token start; |
| if (!this->expect(Token::FOR, "'for'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::LPAREN, "'('")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> initializer; |
| Token nextToken = this->peek(); |
| switch (nextToken.fKind) { |
| case Token::SEMICOLON: |
| this->nextToken(); |
| break; |
| case Token::CONST: { |
| std::unique_ptr<ASTVarDeclarations> vd = this->varDeclarations(); |
| if (!vd) { |
| return nullptr; |
| } |
| initializer = std::unique_ptr<ASTStatement>(new ASTVarDeclarationStatement( |
| std::move(vd))); |
| break; |
| } |
| case Token::IDENTIFIER: { |
| if (this->isType(nextToken.fText)) { |
| std::unique_ptr<ASTVarDeclarations> vd = this->varDeclarations(); |
| if (!vd) { |
| return nullptr; |
| } |
| initializer = std::unique_ptr<ASTStatement>(new ASTVarDeclarationStatement( |
| std::move(vd))); |
| break; |
| } |
| } // fall through |
| default: |
| initializer = this->expressionStatement(); |
| } |
| std::unique_ptr<ASTExpression> test; |
| if (this->peek().fKind != Token::SEMICOLON) { |
| test = this->expression(); |
| if (!test) { |
| return nullptr; |
| } |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> next; |
| if (this->peek().fKind != Token::RPAREN) { |
| next = this->expression(); |
| if (!next) { |
| return nullptr; |
| } |
| } |
| if (!this->expect(Token::RPAREN, "')'")) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTStatement> statement(this->statement()); |
| if (!statement) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTForStatement>(new ASTForStatement(start.fPosition, |
| std::move(initializer), |
| std::move(test), std::move(next), |
| std::move(statement))); |
| } |
| |
| /* RETURN expression? SEMICOLON */ |
| std::unique_ptr<ASTReturnStatement> Parser::returnStatement() { |
| Token start; |
| if (!this->expect(Token::RETURN, "'return'", &start)) { |
| return nullptr; |
| } |
| std::unique_ptr<ASTExpression> expression; |
| if (this->peek().fKind != Token::SEMICOLON) { |
| expression = this->expression(); |
| if (!expression) { |
| return nullptr; |
| } |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTReturnStatement>(new ASTReturnStatement(start.fPosition, |
| std::move(expression))); |
| } |
| |
| /* BREAK SEMICOLON */ |
| std::unique_ptr<ASTBreakStatement> Parser::breakStatement() { |
| Token start; |
| if (!this->expect(Token::BREAK, "'break'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTBreakStatement>(new ASTBreakStatement(start.fPosition)); |
| } |
| |
| /* CONTINUE SEMICOLON */ |
| std::unique_ptr<ASTContinueStatement> Parser::continueStatement() { |
| Token start; |
| if (!this->expect(Token::CONTINUE, "'continue'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTContinueStatement>(new ASTContinueStatement(start.fPosition)); |
| } |
| |
| /* DISCARD SEMICOLON */ |
| std::unique_ptr<ASTDiscardStatement> Parser::discardStatement() { |
| Token start; |
| if (!this->expect(Token::DISCARD, "'continue'", &start)) { |
| return nullptr; |
| } |
| if (!this->expect(Token::SEMICOLON, "';'")) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTDiscardStatement>(new ASTDiscardStatement(start.fPosition)); |
| } |
| |
| /* LBRACE statement* RBRACE */ |
| std::unique_ptr<ASTBlock> Parser::block() { |
| AutoDepth depth(this); |
| if (!depth.checkValid()) { |
| return nullptr; |
| } |
| Token start; |
| if (!this->expect(Token::LBRACE, "'{'", &start)) { |
| return nullptr; |
| } |
| std::vector<std::unique_ptr<ASTStatement>> statements; |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::RBRACE: |
| this->nextToken(); |
| return std::unique_ptr<ASTBlock>(new ASTBlock(start.fPosition, |
| std::move(statements))); |
| case Token::END_OF_FILE: |
| this->error(this->peek().fPosition, "expected '}', but found end of file"); |
| return nullptr; |
| default: { |
| std::unique_ptr<ASTStatement> statement = this->statement(); |
| if (!statement) { |
| return nullptr; |
| } |
| statements.push_back(std::move(statement)); |
| } |
| } |
| } |
| } |
| |
| /* expression SEMICOLON */ |
| std::unique_ptr<ASTExpressionStatement> Parser::expressionStatement() { |
| std::unique_ptr<ASTExpression> expr = this->expression(); |
| if (expr) { |
| if (this->expect(Token::SEMICOLON, "';'")) { |
| ASTExpressionStatement* result = new ASTExpressionStatement(std::move(expr)); |
| return std::unique_ptr<ASTExpressionStatement>(result); |
| } |
| } |
| return nullptr; |
| } |
| |
| /* assignmentExpression */ |
| std::unique_ptr<ASTExpression> Parser::expression() { |
| AutoDepth depth(this); |
| if (!depth.checkValid()) { |
| return nullptr; |
| } |
| return this->commaExpression(); |
| } |
| |
| /* assignmentExpression (COMMA assignmentExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::commaExpression() { |
| std::unique_ptr<ASTExpression> result = this->assignmentExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::COMMA, &t)) { |
| std::unique_ptr<ASTExpression> right = this->commaExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* ternaryExpression ((EQEQ | STAREQ | SLASHEQ | PERCENTEQ | PLUSEQ | MINUSEQ | SHLEQ | SHREQ | |
| BITWISEANDEQ | BITWISEXOREQ | BITWISEOREQ | LOGICALANDEQ | LOGICALXOREQ | LOGICALOREQ) |
| assignmentExpression)* |
| */ |
| std::unique_ptr<ASTExpression> Parser::assignmentExpression() { |
| std::unique_ptr<ASTExpression> result = this->ternaryExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::EQ: // fall through |
| case Token::STAREQ: // fall through |
| case Token::SLASHEQ: // fall through |
| case Token::PERCENTEQ: // fall through |
| case Token::PLUSEQ: // fall through |
| case Token::MINUSEQ: // fall through |
| case Token::SHLEQ: // fall through |
| case Token::SHREQ: // fall through |
| case Token::BITWISEANDEQ: // fall through |
| case Token::BITWISEXOREQ: // fall through |
| case Token::BITWISEOREQ: // fall through |
| case Token::LOGICALANDEQ: // fall through |
| case Token::LOGICALXOREQ: // fall through |
| case Token::LOGICALOREQ: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->assignmentExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result = std::unique_ptr<ASTExpression>(new ASTBinaryExpression(std::move(result), |
| t, |
| std::move(right))); |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* logicalOrExpression ('?' expression ':' assignmentExpression)? */ |
| std::unique_ptr<ASTExpression> Parser::ternaryExpression() { |
| std::unique_ptr<ASTExpression> result = this->logicalOrExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| if (this->checkNext(Token::QUESTION)) { |
| std::unique_ptr<ASTExpression> trueExpr = this->expression(); |
| if (!trueExpr) { |
| return nullptr; |
| } |
| if (this->expect(Token::COLON, "':'")) { |
| std::unique_ptr<ASTExpression> falseExpr = this->assignmentExpression(); |
| return std::unique_ptr<ASTExpression>(new ASTTernaryExpression(std::move(result), |
| std::move(trueExpr), |
| std::move(falseExpr))); |
| } |
| return nullptr; |
| } |
| return result; |
| } |
| |
| /* logicalXorExpression (LOGICALOR logicalXorExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::logicalOrExpression() { |
| std::unique_ptr<ASTExpression> result = this->logicalXorExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::LOGICALOR, &t)) { |
| std::unique_ptr<ASTExpression> right = this->logicalXorExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* logicalAndExpression (LOGICALXOR logicalAndExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::logicalXorExpression() { |
| std::unique_ptr<ASTExpression> result = this->logicalAndExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::LOGICALXOR, &t)) { |
| std::unique_ptr<ASTExpression> right = this->logicalAndExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* bitwiseOrExpression (LOGICALAND bitwiseOrExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::logicalAndExpression() { |
| std::unique_ptr<ASTExpression> result = this->bitwiseOrExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::LOGICALAND, &t)) { |
| std::unique_ptr<ASTExpression> right = this->bitwiseOrExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* bitwiseXorExpression (BITWISEOR bitwiseXorExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::bitwiseOrExpression() { |
| std::unique_ptr<ASTExpression> result = this->bitwiseXorExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::BITWISEOR, &t)) { |
| std::unique_ptr<ASTExpression> right = this->bitwiseXorExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* bitwiseAndExpression (BITWISEXOR bitwiseAndExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::bitwiseXorExpression() { |
| std::unique_ptr<ASTExpression> result = this->bitwiseAndExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::BITWISEXOR, &t)) { |
| std::unique_ptr<ASTExpression> right = this->bitwiseAndExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* equalityExpression (BITWISEAND equalityExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::bitwiseAndExpression() { |
| std::unique_ptr<ASTExpression> result = this->equalityExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| Token t; |
| while (this->checkNext(Token::BITWISEAND, &t)) { |
| std::unique_ptr<ASTExpression> right = this->equalityExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| } |
| return result; |
| } |
| |
| /* relationalExpression ((EQEQ | NEQ) relationalExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::equalityExpression() { |
| std::unique_ptr<ASTExpression> result = this->relationalExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::EQEQ: // fall through |
| case Token::NEQ: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->relationalExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* shiftExpression ((LT | GT | LTEQ | GTEQ) shiftExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::relationalExpression() { |
| std::unique_ptr<ASTExpression> result = this->shiftExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::LT: // fall through |
| case Token::GT: // fall through |
| case Token::LTEQ: // fall through |
| case Token::GTEQ: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->shiftExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* additiveExpression ((SHL | SHR) additiveExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::shiftExpression() { |
| std::unique_ptr<ASTExpression> result = this->additiveExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::SHL: // fall through |
| case Token::SHR: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->additiveExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* multiplicativeExpression ((PLUS | MINUS) multiplicativeExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::additiveExpression() { |
| std::unique_ptr<ASTExpression> result = this->multiplicativeExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::PLUS: // fall through |
| case Token::MINUS: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->multiplicativeExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* unaryExpression ((STAR | SLASH | PERCENT) unaryExpression)* */ |
| std::unique_ptr<ASTExpression> Parser::multiplicativeExpression() { |
| std::unique_ptr<ASTExpression> result = this->unaryExpression(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::STAR: // fall through |
| case Token::SLASH: // fall through |
| case Token::PERCENT: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> right = this->unaryExpression(); |
| if (!right) { |
| return nullptr; |
| } |
| result.reset(new ASTBinaryExpression(std::move(result), t, std::move(right))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* postfixExpression | (PLUS | MINUS | NOT | PLUSPLUS | MINUSMINUS) unaryExpression */ |
| std::unique_ptr<ASTExpression> Parser::unaryExpression() { |
| switch (this->peek().fKind) { |
| case Token::PLUS: // fall through |
| case Token::MINUS: // fall through |
| case Token::LOGICALNOT: // fall through |
| case Token::BITWISENOT: // fall through |
| case Token::PLUSPLUS: // fall through |
| case Token::MINUSMINUS: { |
| Token t = this->nextToken(); |
| std::unique_ptr<ASTExpression> expr = this->unaryExpression(); |
| if (!expr) { |
| return nullptr; |
| } |
| return std::unique_ptr<ASTExpression>(new ASTPrefixExpression(t, std::move(expr))); |
| } |
| default: |
| return this->postfixExpression(); |
| } |
| } |
| |
| /* term suffix* */ |
| std::unique_ptr<ASTExpression> Parser::postfixExpression() { |
| std::unique_ptr<ASTExpression> result = this->term(); |
| if (!result) { |
| return nullptr; |
| } |
| for (;;) { |
| switch (this->peek().fKind) { |
| case Token::LBRACKET: // fall through |
| case Token::DOT: // fall through |
| case Token::LPAREN: // fall through |
| case Token::PLUSPLUS: // fall through |
| case Token::MINUSMINUS: { |
| std::unique_ptr<ASTSuffix> s = this->suffix(); |
| if (!s) { |
| return nullptr; |
| } |
| result.reset(new ASTSuffixExpression(std::move(result), std::move(s))); |
| break; |
| } |
| default: |
| return result; |
| } |
| } |
| } |
| |
| /* LBRACKET expression? RBRACKET | DOT IDENTIFIER | LPAREN parameters RPAREN | |
| PLUSPLUS | MINUSMINUS */ |
| std::unique_ptr<ASTSuffix> Parser::suffix() { |
| Token next = this->nextToken(); |
| switch (next.fKind) { |
| case Token::LBRACKET: { |
| if (this->checkNext(Token::RBRACKET)) { |
| return std::unique_ptr<ASTSuffix>(new ASTIndexSuffix(next.fPosition)); |
| } |
| std::unique_ptr<ASTExpression> e = this->expression(); |
| if (!e) { |
| return nullptr; |
| } |
| this->expect(Token::RBRACKET, "']' to complete array access expression"); |
| return std::unique_ptr<ASTSuffix>(new ASTIndexSuffix(std::move(e))); |
| } |
| case Token::DOT: { |
| Position pos = this->peek().fPosition; |
| String text; |
| if (this->identifier(&text)) { |
| return std::unique_ptr<ASTSuffix>(new ASTFieldSuffix(pos, std::move(text))); |
| } |
| return nullptr; |
| } |
| case Token::LPAREN: { |
| std::vector<std::unique_ptr<ASTExpression>> parameters; |
| if (this->peek().fKind != Token::RPAREN) { |
| for (;;) { |
| std::unique_ptr<ASTExpression> expr = this->assignmentExpression(); |
| if (!expr) { |
| return nullptr; |
| } |
| parameters.push_back(std::move(expr)); |
| if (!this->checkNext(Token::COMMA)) { |
| break; |
| } |
| } |
| } |
| this->expect(Token::RPAREN, "')' to complete function parameters"); |
| return std::unique_ptr<ASTSuffix>(new ASTCallSuffix(next.fPosition, |
| std::move(parameters))); |
| } |
| case Token::PLUSPLUS: |
| return std::unique_ptr<ASTSuffix>(new ASTSuffix(next.fPosition, |
| ASTSuffix::kPostIncrement_Kind)); |
| case Token::MINUSMINUS: |
| return std::unique_ptr<ASTSuffix>(new ASTSuffix(next.fPosition, |
| ASTSuffix::kPostDecrement_Kind)); |
| default: { |
| this->error(next.fPosition, "expected expression suffix, but found '" + next.fText + |
| "'\n"); |
| return nullptr; |
| } |
| } |
| } |
| |
| /* IDENTIFIER | intLiteral | floatLiteral | boolLiteral | '(' expression ')' */ |
| std::unique_ptr<ASTExpression> Parser::term() { |
| std::unique_ptr<ASTExpression> result; |
| Token t = this->peek(); |
| switch (t.fKind) { |
| case Token::IDENTIFIER: { |
| String text; |
| if (this->identifier(&text)) { |
| result.reset(new ASTIdentifier(t.fPosition, std::move(text))); |
| } |
| break; |
| } |
| case Token::INT_LITERAL: { |
| int64_t i; |
| if (this->intLiteral(&i)) { |
| result.reset(new ASTIntLiteral(t.fPosition, i)); |
| } |
| break; |
| } |
| case Token::FLOAT_LITERAL: { |
| double f; |
| if (this->floatLiteral(&f)) { |
| result.reset(new ASTFloatLiteral(t.fPosition, f)); |
| } |
| break; |
| } |
| case Token::TRUE_LITERAL: // fall through |
| case Token::FALSE_LITERAL: { |
| bool b; |
| if (this->boolLiteral(&b)) { |
| result.reset(new ASTBoolLiteral(t.fPosition, b)); |
| } |
| break; |
| } |
| case Token::LPAREN: { |
| this->nextToken(); |
| result = this->expression(); |
| if (result) { |
| this->expect(Token::RPAREN, "')' to complete expression"); |
| } |
| break; |
| } |
| default: |
| this->nextToken(); |
| this->error(t.fPosition, "expected expression, but found '" + t.fText + "'\n"); |
| result = nullptr; |
| } |
| return result; |
| } |
| |
| /* INT_LITERAL */ |
| bool Parser::intLiteral(int64_t* dest) { |
| Token t; |
| if (this->expect(Token::INT_LITERAL, "integer literal", &t)) { |
| *dest = SkSL::stol(t.fText); |
| return true; |
| } |
| return false; |
| } |
| |
| /* FLOAT_LITERAL */ |
| bool Parser::floatLiteral(double* dest) { |
| Token t; |
| if (this->expect(Token::FLOAT_LITERAL, "float literal", &t)) { |
| *dest = SkSL::stod(t.fText); |
| return true; |
| } |
| return false; |
| } |
| |
| /* TRUE_LITERAL | FALSE_LITERAL */ |
| bool Parser::boolLiteral(bool* dest) { |
| Token t = this->nextToken(); |
| switch (t.fKind) { |
| case Token::TRUE_LITERAL: |
| *dest = true; |
| return true; |
| case Token::FALSE_LITERAL: |
| *dest = false; |
| return true; |
| default: |
| this->error(t.fPosition, "expected 'true' or 'false', but found '" + t.fText + "'\n"); |
| return false; |
| } |
| } |
| |
| /* IDENTIFIER */ |
| bool Parser::identifier(String* dest) { |
| Token t; |
| if (this->expect(Token::IDENTIFIER, "identifier", &t)) { |
| *dest = t.fText; |
| return true; |
| } |
| return false; |
| } |
| |
| } // namespace |
