blob: e82048459143e1cac5261fed5bd966fd29dfbc26 [file] [log] [blame]
* 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 <vector>
#include <memory>
#include <unordered_map>
#include <unordered_set>
#include "SkSLErrorReporter.h"
#include "ir/SkSLLayout.h"
#include "SkSLToken.h"
struct yy_buffer_state;
typedef struct yy_buffer_state *YY_BUFFER_STATE;
namespace SkSL {
struct ASTBlock;
struct ASTBreakStatement;
struct ASTContinueStatement;
struct ASTDeclaration;
struct ASTDiscardStatement;
struct ASTDoStatement;
struct ASTExpression;
struct ASTExpressionStatement;
struct ASTForStatement;
struct ASTIfStatement;
struct ASTInterfaceBlock;
struct ASTParameter;
struct ASTPrecision;
struct ASTReturnStatement;
struct ASTStatement;
struct ASTSuffix;
struct ASTSwitchCase;
struct ASTSwitchStatement;
struct ASTType;
struct ASTWhileStatement;
struct ASTVarDeclarations;
struct Modifiers;
class SymbolTable;
* Consumes .sksl text and produces an abstract syntax tree describing the contents.
class Parser {
Parser(String text, SymbolTable& types, ErrorReporter& errors);
* Consumes a complete .sksl file and produces a list of declarations. Errors are reported via
* the ErrorReporter; the return value may contain some declarations even when errors have
* occurred.
std::vector<std::unique_ptr<ASTDeclaration>> file();
* Return the next token, including whitespace tokens, from the parse stream.
Token nextRawToken();
* Return the next non-whitespace token from the parse stream.
Token nextToken();
* Push a token back onto the parse stream, so that it is the next one read. Only a single level
* of pushback is supported (that is, it is an error to call pushback() twice in a row without
* an intervening nextToken()).
void pushback(Token t);
* Returns the next non-whitespace token without consuming it from the stream.
Token peek();
* Checks to see if the next token is of the specified type. If so, stores it in result (if
* result is non-null) and returns true. Otherwise, pushes it back and returns false.
bool checkNext(Token::Kind kind, Token* result = nullptr);
* Reads the next non-whitespace token and generates an error if it is not the expected type.
* The 'expected' string is part of the error message, which reads:
* "expected <expected>, but found '<actual text>'"
* If 'result' is non-null, it is set to point to the token that was read.
* Returns true if the read token was as expected, false otherwise.
bool expect(Token::Kind kind, const char* expected, Token* result = nullptr);
bool expect(Token::Kind kind, String expected, Token* result = nullptr);
void error(Position p, const char* msg);
void error(Position p, String msg);
* Returns true if the 'name' identifier refers to a type name. For instance, isType("int") will
* always return true.
bool isType(String name);
// these functions parse individual grammar rules from the current parse position; you probably
// don't need to call any of these outside of the parser. The function declarations in the .cpp
// file have comments describing the grammar rules.
std::unique_ptr<ASTDeclaration> precision();
std::unique_ptr<ASTDeclaration> directive();
std::unique_ptr<ASTDeclaration> section();
std::unique_ptr<ASTDeclaration> declaration();
std::unique_ptr<ASTVarDeclarations> varDeclarations();
std::unique_ptr<ASTType> structDeclaration();
std::unique_ptr<ASTVarDeclarations> structVarDeclaration(Modifiers modifiers);
std::unique_ptr<ASTVarDeclarations> varDeclarationEnd(Modifiers modifiers,
std::unique_ptr<ASTType> type,
String name);
std::unique_ptr<ASTParameter> parameter();
int layoutInt();
String layoutCode();
Layout::Key layoutKey();
Layout layout();
Modifiers modifiers();
Modifiers modifiersWithDefaults(int defaultFlags);
std::unique_ptr<ASTStatement> statement();
std::unique_ptr<ASTType> type();
std::unique_ptr<ASTDeclaration> interfaceBlock(Modifiers mods);
std::unique_ptr<ASTIfStatement> ifStatement();
std::unique_ptr<ASTDoStatement> doStatement();
std::unique_ptr<ASTWhileStatement> whileStatement();
std::unique_ptr<ASTForStatement> forStatement();
std::unique_ptr<ASTSwitchCase> switchCase();
std::unique_ptr<ASTStatement> switchStatement();
std::unique_ptr<ASTReturnStatement> returnStatement();
std::unique_ptr<ASTBreakStatement> breakStatement();
std::unique_ptr<ASTContinueStatement> continueStatement();
std::unique_ptr<ASTDiscardStatement> discardStatement();
std::unique_ptr<ASTBlock> block();
std::unique_ptr<ASTExpressionStatement> expressionStatement();
std::unique_ptr<ASTExpression> expression();
std::unique_ptr<ASTExpression> commaExpression();
std::unique_ptr<ASTExpression> assignmentExpression();
std::unique_ptr<ASTExpression> ternaryExpression();
std::unique_ptr<ASTExpression> logicalOrExpression();
std::unique_ptr<ASTExpression> logicalXorExpression();
std::unique_ptr<ASTExpression> logicalAndExpression();
std::unique_ptr<ASTExpression> bitwiseOrExpression();
std::unique_ptr<ASTExpression> bitwiseXorExpression();
std::unique_ptr<ASTExpression> bitwiseAndExpression();
std::unique_ptr<ASTExpression> equalityExpression();
std::unique_ptr<ASTExpression> relationalExpression();
std::unique_ptr<ASTExpression> shiftExpression();
std::unique_ptr<ASTExpression> additiveExpression();
std::unique_ptr<ASTExpression> multiplicativeExpression();
std::unique_ptr<ASTExpression> unaryExpression();
std::unique_ptr<ASTExpression> postfixExpression();
std::unique_ptr<ASTSuffix> suffix();
std::unique_ptr<ASTExpression> term();
bool intLiteral(int64_t* dest);
bool floatLiteral(double* dest);
bool boolLiteral(bool* dest);
bool identifier(String* dest);
void* fScanner;
void* fLayoutScanner;
// current parse depth, used to enforce a recursion limit to try to keep us from overflowing the
// stack on pathological inputs
int fDepth = 0;
Token fPushback;
SymbolTable& fTypes;
ErrorReporter& fErrors;
friend class AutoDepth;
} // namespace