blob: 1b6690d535acbd5c40114e96b32d31aeb4db359c [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 "stdio.h"
#include "SkSLParser.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/SkSLASTEnum.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/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(), String("exceeded max parse depth"));
return false;
}
return true;
}
private:
Parser* fParser;
};
Parser::Parser(const char* text, size_t length, SymbolTable& types, ErrorReporter& errors)
: fText(text)
, fPushback(Token::INVALID, -1, -1)
, fTypes(types)
, fErrors(errors) {
fLexer.start(text, length);
}
/* (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::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 result = fPushback;
fPushback.fKind = Token::INVALID;
return result;
}
Token result = fLexer.next();
return result;
}
Token Parser::nextToken() {
Token token = this->nextRawToken();
while (token.fKind == Token::WHITESPACE || token.fKind == Token::LINE_COMMENT ||
token.fKind == Token::BLOCK_COMMENT) {
token = this->nextRawToken();
}
return token;
}
void Parser::pushback(Token t) {
ASSERT(fPushback.fKind == Token::INVALID);
fPushback = std::move(t);
}
Token Parser::peek() {
if (fPushback.fKind == Token::INVALID) {
fPushback = this->nextToken();
}
return fPushback;
}
bool Parser::checkNext(Token::Kind kind, Token* result) {
if (fPushback.fKind != Token::INVALID && fPushback.fKind != kind) {
return false;
}
Token next = this->nextToken();
if (next.fKind == kind) {
if (result) {
*result = next;
}
return true;
}
this->pushback(std::move(next));
return false;
}
bool Parser::expect(Token::Kind kind, const char* expected, Token* result) {
Token next = this->nextToken();
if (next.fKind == kind) {
if (result) {
*result = std::move(next);
}
return true;
} else {
this->error(next, "expected " + String(expected) + ", but found '" +
this->text(next) + "'");
return false;
}
}
StringFragment Parser::text(Token token) {
return StringFragment(fText + token.fOffset, token.fLength);
}
void Parser::error(Token token, String msg) {
this->error(token.fOffset, msg);
}
void Parser::error(int offset, String msg) {
fErrors.error(offset, msg);
}
bool Parser::isType(StringFragment name) {
return nullptr != fTypes[name];
}
/* 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;
}
StringFragment text = this->text(start);
if (text == "#version") {
this->expect(Token::INT_LITERAL, "a version number");
Token next = this->peek();
StringFragment nextText = this->text(next);
if (nextText == "es" || nextText == "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 (text == "#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.fOffset,
String(this->text(name))));
} else {
this->error(start, "unsupported directive '" + this->text(start) + "'");
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 = this->text(argToken);
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, "reached end of file while parsing section");
return nullptr;
default:
break;
}
if (!level) {
break;
}
text += this->text(next);
}
StringFragment name = this->text(start);
++name.fChars;
--name.fLength;
return std::unique_ptr<ASTDeclaration>(new ASTSection(start.fOffset,
String(name),
argument,
text));
}
/* ENUM CLASS IDENTIFIER LBRACE (IDENTIFIER (EQ expression)? (COMMA IDENTIFIER (EQ expression))*)?
RBRACE */
std::unique_ptr<ASTDeclaration> Parser::enumDeclaration() {
Token start;
if (!this->expect(Token::ENUM, "'enum'", &start)) {
return nullptr;
}
if (!this->expect(Token::CLASS, "'class'")) {
return nullptr;
}
Token name;
if (!this->expect(Token::IDENTIFIER, "an identifier", &name)) {
return nullptr;
}
if (!this->expect(Token::LBRACE, "'{'")) {
return nullptr;
}
fTypes.add(this->text(name), std::unique_ptr<Symbol>(new Type(this->text(name),
Type::kEnum_Kind)));
std::vector<StringFragment> names;
std::vector<std::unique_ptr<ASTExpression>> values;
if (!this->checkNext(Token::RBRACE)) {
Token id;
if (!this->expect(Token::IDENTIFIER, "an identifier", &id)) {
return nullptr;
}
names.push_back(this->text(id));
if (this->checkNext(Token::EQ)) {
std::unique_ptr<ASTExpression> value = this->assignmentExpression();
if (!value) {
return nullptr;
}
values.push_back(std::move(value));
} else {
values.push_back(nullptr);
}
while (!this->checkNext(Token::RBRACE)) {
if (!this->expect(Token::COMMA, "','")) {
return nullptr;
}
if (!this->expect(Token::IDENTIFIER, "an identifier", &id)) {
return nullptr;
}
names.push_back(this->text(id));
if (this->checkNext(Token::EQ)) {
std::unique_ptr<ASTExpression> value = this->assignmentExpression();
if (!value) {
return nullptr;
}
values.push_back(std::move(value));
} else {
values.push_back(nullptr);
}
}
}
this->expect(Token::SEMICOLON, "';'");
return std::unique_ptr<ASTDeclaration>(new ASTEnum(name.fOffset, this->text(name), names,
std::move(values)));
}
/* enumDeclaration | modifiers (structVarDeclaration | type IDENTIFIER ((LPAREN parameter
(COMMA parameter)* RPAREN (block | SEMICOLON)) | SEMICOLON) | interfaceBlock) */
std::unique_ptr<ASTDeclaration> Parser::declaration() {
Token lookahead = this->peek();
if (lookahead.fKind == Token::ENUM) {
return this->enumDeclaration();
}
Modifiers modifiers = this->modifiers();
lookahead = this->peek();
if (lookahead.fKind == Token::IDENTIFIER && !this->isType(this->text(lookahead))) {
// 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.fOffset,
modifiers,
std::move(type),
this->text(name),
std::move(parameters),
std::move(body)));
} else {
return this->varDeclarationEnd(modifiers, std::move(type), this->text(name));
}
}
/* 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), this->text(name));
}
/* 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->fOffset, "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->fOffset, "initializers are not permitted on struct fields");
}
}
}
if (!this->expect(Token::RBRACE, "'}'")) {
return nullptr;
}
fTypes.add(this->text(name), std::unique_ptr<Type>(new Type(name.fOffset, this->text(name),
fields)));
return std::unique_ptr<ASTType>(new ASTType(name.fOffset, this->text(name),
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),
this->text(name));
if (result) {
for (const auto& var : result->fVars) {
if (var.fValue) {
this->error(var.fValue->fOffset,
"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,
StringFragment 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(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(this->text(name), 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(this->text(sizeToken)));
if (!this->expect(Token::RBRACKET, "']'")) {
return nullptr;
}
}
return std::unique_ptr<ASTParameter>(new ASTParameter(name.fOffset, modifiers, std::move(type),
this->text(name), 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(this->text(resultToken));
}
return -1;
}
/** EQ IDENTIFIER */
StringFragment Parser::layoutIdentifier() {
if (!this->expect(Token::EQ, "'='")) {
return StringFragment();
}
Token resultToken;
if (!this->expect(Token::IDENTIFIER, "an identifier", &resultToken)) {
return StringFragment();
}
return this->text(resultToken);
}
/** 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->nextRawToken();
this->pushback(start);
String code;
int level = 1;
bool done = false;
while (!done) {
Token next = this->nextRawToken();
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, "reached end of file while parsing layout");
return nullptr;
default:
break;
}
if (!level) {
done = true;
}
if (done) {
this->pushback(std::move(next));
}
else {
code += this->text(next);
}
}
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 (this->text(key) == "identity") {
return Layout::kIdentity_Key;
} else {
this->error(key, "unsupported layout key");
}
}
}
return Layout::kKey_Key;
}
/* LAYOUT LPAREN IDENTIFIER (EQ INT_LITERAL)? (COMMA IDENTIFIER (EQ INT_LITERAL)?)* RPAREN */
Layout Parser::layout() {
int flags = 0;
int location = -1;
int offset = -1;
int binding = -1;
int index = -1;
int set = -1;
int builtin = -1;
int inputAttachmentIndex = -1;
Layout::Format format = Layout::Format::kUnspecified;
Layout::Primitive primitive = Layout::kUnspecified_Primitive;
int maxVertices = -1;
int invocations = -1;
String when;
StringFragment ctype;
Layout::Key key = Layout::kNo_Key;
if (this->checkNext(Token::LAYOUT)) {
if (!this->expect(Token::LPAREN, "'('")) {
return Layout(flags, location, offset, binding, index, set, builtin,
inputAttachmentIndex, format, primitive, maxVertices, invocations, when,
key, ctype);
}
for (;;) {
Token t = this->nextToken();
String text = this->text(t);
fLayoutLexer.start(text.c_str(), text.size());
int token = fLayoutLexer.next().fKind;
if (token != LayoutToken::INVALID) {
switch (token) {
case LayoutToken::LOCATION:
location = this->layoutInt();
break;
case LayoutToken::OFFSET:
offset = this->layoutInt();
break;
case LayoutToken::BINDING:
binding = this->layoutInt();
break;
case LayoutToken::INDEX:
index = this->layoutInt();
break;
case LayoutToken::SET:
set = this->layoutInt();
break;
case LayoutToken::BUILTIN:
builtin = this->layoutInt();
break;
case LayoutToken::INPUT_ATTACHMENT_INDEX:
inputAttachmentIndex = this->layoutInt();
break;
case LayoutToken::ORIGIN_UPPER_LEFT:
flags |= Layout::kOriginUpperLeft_Flag;
break;
case LayoutToken::OVERRIDE_COVERAGE:
flags |= Layout::kOverrideCoverage_Flag;
break;
case LayoutToken::BLEND_SUPPORT_ALL_EQUATIONS:
flags |= Layout::kBlendSupportAllEquations_Flag;
break;
case LayoutToken::BLEND_SUPPORT_MULTIPLY:
flags |= Layout::kBlendSupportMultiply_Flag;
break;
case LayoutToken::BLEND_SUPPORT_SCREEN:
flags |= Layout::kBlendSupportScreen_Flag;
break;
case LayoutToken::BLEND_SUPPORT_OVERLAY:
flags |= Layout::kBlendSupportOverlay_Flag;
break;
case LayoutToken::BLEND_SUPPORT_DARKEN:
flags |= Layout::kBlendSupportDarken_Flag;
break;
case LayoutToken::BLEND_SUPPORT_LIGHTEN:
flags |= Layout::kBlendSupportLighten_Flag;
break;
case LayoutToken::BLEND_SUPPORT_COLORDODGE:
flags |= Layout::kBlendSupportColorDodge_Flag;
break;
case LayoutToken::BLEND_SUPPORT_COLORBURN:
flags |= Layout::kBlendSupportColorBurn_Flag;
break;
case LayoutToken::BLEND_SUPPORT_HARDLIGHT:
flags |= Layout::kBlendSupportHardLight_Flag;
break;
case LayoutToken::BLEND_SUPPORT_SOFTLIGHT:
flags |= Layout::kBlendSupportSoftLight_Flag;
break;
case LayoutToken::BLEND_SUPPORT_DIFFERENCE:
flags |= Layout::kBlendSupportDifference_Flag;
break;
case LayoutToken::BLEND_SUPPORT_EXCLUSION:
flags |= Layout::kBlendSupportExclusion_Flag;
break;
case LayoutToken::BLEND_SUPPORT_HSL_HUE:
flags |= Layout::kBlendSupportHSLHue_Flag;
break;
case LayoutToken::BLEND_SUPPORT_HSL_SATURATION:
flags |= Layout::kBlendSupportHSLSaturation_Flag;
break;
case LayoutToken::BLEND_SUPPORT_HSL_COLOR:
flags |= Layout::kBlendSupportHSLColor_Flag;
break;
case LayoutToken::BLEND_SUPPORT_HSL_LUMINOSITY:
flags |= Layout::kBlendSupportHSLLuminosity_Flag;
break;
case LayoutToken::PUSH_CONSTANT:
flags |= Layout::kPushConstant_Flag;
break;
case LayoutToken::POINTS:
primitive = Layout::kPoints_Primitive;
break;
case LayoutToken::LINES:
primitive = Layout::kLines_Primitive;
break;
case LayoutToken::LINE_STRIP:
primitive = Layout::kLineStrip_Primitive;
break;
case LayoutToken::LINES_ADJACENCY:
primitive = Layout::kLinesAdjacency_Primitive;
break;
case LayoutToken::TRIANGLES:
primitive = Layout::kTriangles_Primitive;
break;
case LayoutToken::TRIANGLE_STRIP:
primitive = Layout::kTriangleStrip_Primitive;
break;
case LayoutToken::TRIANGLES_ADJACENCY:
primitive = Layout::kTrianglesAdjacency_Primitive;
break;
case LayoutToken::MAX_VERTICES:
maxVertices = this->layoutInt();
break;
case LayoutToken::INVOCATIONS:
invocations = this->layoutInt();
break;
case LayoutToken::WHEN:
when = this->layoutCode();
break;
case LayoutToken::KEY:
key = this->layoutKey();
break;
case LayoutToken::CTYPE:
ctype = this->layoutIdentifier();
break;
}
} else if (Layout::ReadFormat(this->text(t), &format)) {
// AST::ReadFormat stored the result in 'format'.
} else {
this->error(t, ("'" + this->text(t) + "' is not a valid layout qualifier").c_str());
}
if (this->checkNext(Token::RPAREN)) {
break;
}
if (!this->expect(Token::COMMA, "','")) {
break;
}
}
}
return Layout(flags, location, offset, binding, index, set, builtin, inputAttachmentIndex,
format, primitive, maxVertices, invocations, when, key, ctype);
}
/* 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.fOffset,
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(this->text(start))) {
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(this->text(type))) {
this->error(type, ("no type named '" + this->text(type) + "'").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.fOffset, this->text(type),
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, "no type named '" + this->text(name) + "'");
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;
StringFragment instanceName;
Token instanceNameToken;
if (this->checkNext(Token::IDENTIFIER, &instanceNameToken)) {
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, "']'");
}
instanceName = this->text(instanceNameToken);
}
this->expect(Token::SEMICOLON, "';'");
return std::unique_ptr<ASTDeclaration>(new ASTInterfaceBlock(name.fOffset, mods,
this->text(name),
std::move(decls),
instanceName,
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.fOffset,
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.fOffset,
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.fOffset,
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.fOffset, 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.fOffset, nullptr,
std::move(statements)));
}
if (!this->expect(Token::RBRACE, "'}'")) {
return nullptr;
}
return std::unique_ptr<ASTStatement>(new ASTSwitchStatement(start.fOffset,
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(this->text(nextToken))) {
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.fOffset,
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.fOffset,
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.fOffset));
}
/* 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.fOffset));
}
/* 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.fOffset));
}
/* 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.fOffset,
std::move(statements)));
case Token::END_OF_FILE:
this->error(this->peek(), "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;
}
/* commaExpression */
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), std::move(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),
std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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), std::move(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(std::move(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: // fall through
case Token::COLONCOLON: {
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 | COLONCOLON IDENTIFIER */
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.fOffset));
}
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: // fall through
case Token::COLONCOLON: {
int offset = this->peek().fOffset;
StringFragment text;
if (this->identifier(&text)) {
return std::unique_ptr<ASTSuffix>(new ASTFieldSuffix(offset, 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.fOffset,
std::move(parameters)));
}
case Token::PLUSPLUS:
return std::unique_ptr<ASTSuffix>(new ASTSuffix(next.fOffset,
ASTSuffix::kPostIncrement_Kind));
case Token::MINUSMINUS:
return std::unique_ptr<ASTSuffix>(new ASTSuffix(next.fOffset,
ASTSuffix::kPostDecrement_Kind));
default: {
this->error(next, "expected expression suffix, but found '" + this->text(next) +
"'\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: {
StringFragment text;
if (this->identifier(&text)) {
result.reset(new ASTIdentifier(t.fOffset, std::move(text)));
}
break;
}
case Token::INT_LITERAL: {
int64_t i;
if (this->intLiteral(&i)) {
result.reset(new ASTIntLiteral(t.fOffset, i));
}
break;
}
case Token::FLOAT_LITERAL: {
double f;
if (this->floatLiteral(&f)) {
result.reset(new ASTFloatLiteral(t.fOffset, f));
}
break;
}
case Token::TRUE_LITERAL: // fall through
case Token::FALSE_LITERAL: {
bool b;
if (this->boolLiteral(&b)) {
result.reset(new ASTBoolLiteral(t.fOffset, 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.fOffset, "expected expression, but found '" + this->text(t) + "'\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(this->text(t));
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(this->text(t));
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, "expected 'true' or 'false', but found '" + this->text(t) + "'\n");
return false;
}
}
/* IDENTIFIER */
bool Parser::identifier(StringFragment* dest) {
Token t;
if (this->expect(Token::IDENTIFIER, "identifier", &t)) {
*dest = this->text(t);
return true;
}
return false;
}
} // namespace