+#include <msp/core/raii.h>
#include <msp/strings/format.h>
#include <msp/strings/regex.h>
#include "programparser.h"
delete module;
}
-Module &ProgramParser::parse(const string &s)
+Module &ProgramParser::parse(const string &s, const string &n)
{
source = s;
+ source_name = n;
parse_source();
return *module;
}
-Module &ProgramParser::parse(IO::Base &io)
+Module &ProgramParser::parse(IO::Base &io, const string &n)
{
source = string();
+ source_name = n;
while(!io.eof())
{
char buffer[4096];
void ProgramParser::parse_source()
{
+ while(1)
+ {
+ string::size_type slashes = source.find("//////");
+ if(slashes==string::npos)
+ break;
+
+ string::size_type newline = source.find('\n', slashes);
+ string pragma = format("#pragma MSP stage(%s)", source.substr(slashes+6, newline-slashes-6));
+ source.replace(slashes, newline-slashes, pragma);
+ }
+
delete module;
module = new Module;
cur_stage = &module->shared;
iter = source.begin();
- while(1)
- {
- while(Node *statement = parse_global_declaration())
- cur_stage->content.body.push_back(statement);
-
- parse_token();
- string token = parse_token();
- if(token.empty())
- break;
- else if(token=="vertex")
- module->stages.push_back(VERTEX);
- else if(token=="geometry")
- module->stages.push_back(GEOMETRY);
- else if(token=="fragment")
- module->stages.push_back(FRAGMENT);
- else
- throw runtime_error(format("Parse error at '%s': expected stage identifier", token));
+ source_end = source.end();
+ current_line = 1;
+ allow_preprocess = true;
+ while(RefPtr<Node> statement = parse_global_declaration())
+ cur_stage->content.body.push_back(statement);
+}
- if(cur_stage->type!=SHARED)
- module->stages.back().previous = cur_stage;
- cur_stage = &module->stages.back();
+string ProgramParser::format_error(const std::string &message)
+{
+ string location = format("%s:%d: ", source_name, current_line);
+ return location+message;
+}
- for(; (iter!=source.end() && *iter!='\n'); ++iter) ;
- }
+string ProgramParser::format_syntax_error(const std::string &expected)
+{
+ return format_error(format("Syntax error at '%s': expected %s", last_token, expected));
}
const string &ProgramParser::peek_token(unsigned index)
{
while(next_tokens.size()<=index)
next_tokens.push_back(parse_token_());
- return next_tokens[index];
+ return (last_token = next_tokens[index]);
}
-string ProgramParser::parse_token()
+const string &ProgramParser::parse_token()
{
if(!next_tokens.empty())
{
- string token = next_tokens.front();
+ last_token = next_tokens.front();
next_tokens.pop_front();
- return token;
+ return last_token;
}
- return parse_token_();
+ return (last_token = parse_token_());
}
string ProgramParser::parse_token_()
{
- if(!skip_comment_and_whitespace())
- return string();
-
- if(isalpha(*iter) || *iter=='_')
- return parse_identifier();
- else if(isdigit(*iter))
- return parse_number();
- else
- return parse_other();
+ while(1)
+ {
+ skip_comment_and_whitespace();
+ if(iter==source_end)
+ return string();
+ else if(allow_preprocess && *iter=='#')
+ {
+ allow_preprocess = false;
+ SetForScope<deque<string> > clear_tokens(next_tokens, deque<string>());
+ preprocess();
+ }
+ else if(isalpha(*iter) || *iter=='_')
+ return parse_identifier();
+ else if(isdigit(*iter))
+ return parse_number();
+ else
+ return parse_other();
+ }
}
string ProgramParser::parse_identifier()
{
string ident;
- while(iter!=source.end())
+ while(iter!=source_end)
{
if(isalnum(*iter) || *iter=='_')
ident += *iter++;
{
bool accept_sign = false;
string number;
- while(iter!=source.end())
+ while(iter!=source_end)
{
if(isdigit(*iter) || *iter=='.')
number += *iter++;
string ProgramParser::parse_other()
{
- if(iter==source.end())
+ if(iter==source_end)
return string();
string token(1, *iter++);
- for(unsigned i=1; (i<3 && iter!=source.end()); ++i)
+ for(unsigned i=1; (i<3 && iter!=source_end); ++i)
{
bool matched = false;
for(const Operator *j=operators; (!matched && j->type); ++j)
return token;
}
-bool ProgramParser::skip_comment_and_whitespace()
+void ProgramParser::skip_comment_and_whitespace()
{
unsigned comment = 0;
- unsigned slashes = 0;
- while(iter!=source.end())
+ while(iter!=source_end)
{
if(comment==0)
{
else if(comment==1)
{
if(*iter=='/')
- {
comment = 2;
- slashes = 2;
- }
else if(*iter=='*')
comment = 3;
else
{
if(*iter=='\n')
comment = 0;
- else if(*iter=='/')
- ++slashes;
- else if(!isspace(*iter) && slashes>=6)
- return false;
}
else if(comment==3 && *iter=='*')
comment = 4;
comment = 3;
}
+ if(*iter=='\n')
+ {
+ ++current_line;
+ allow_preprocess = (comment<3);
+ }
+
++iter;
}
-
- return iter!=source.end();
}
void ProgramParser::expect(const string &token)
{
string parsed = parse_token();
if(parsed!=token)
- throw runtime_error(format("Parse error at '%s': expected '%s'", parsed, token));
+ throw runtime_error(format_syntax_error(format("'%s'", token)));
}
string ProgramParser::expect_type()
{
string token = parse_token();
if(!is_type(token))
- throw runtime_error(format("Parse error at '%s': expected a type", token));
+ throw runtime_error(format_syntax_error("a type"));
return token;
}
{
string token = parse_token();
if(!is_identifier(token))
- throw runtime_error(format("Parse error at '%s': expected an identifier", token));
+ throw runtime_error(format_syntax_error("an identifier"));
return token;
}
return token=="centroid";
}
+bool ProgramParser::is_precision_qualifier(const string &token)
+{
+ return (token=="highp" || token=="mediump" || token=="lowp");
+}
+
bool ProgramParser::is_qualifier(const string &token)
{
- return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token));
+ return (token=="const" || is_interface_qualifier(token) || is_sampling_qualifier(token) || is_precision_qualifier(token));
}
bool ProgramParser::is_builtin_type(const string &token)
return re.match(token);
}
-Node *ProgramParser::parse_global_declaration()
+void ProgramParser::preprocess()
+{
+ expect("#");
+
+ string::const_iterator line_end = iter;
+ for(; (line_end!=source_end && *line_end!='\n'); ++line_end) ;
+ SetForScope<string::const_iterator> stop_at_line_end(source_end, line_end);
+
+ string token = peek_token();
+ if(token=="pragma")
+ preprocess_pragma();
+ else if(token=="define" || token=="undef" || token=="if" || token=="ifdef" || token=="ifndef" || token=="else" ||
+ token=="elif" || token=="endif" || token=="error" || token=="extension" || token=="version" || token=="line")
+ throw runtime_error(format_error(format("Unsupported preprocessor directive '%s'", token)));
+ else if(!token.empty())
+ throw runtime_error(format_syntax_error("a preprocessor directive"));
+
+ iter = line_end;
+}
+
+void ProgramParser::preprocess_pragma()
+{
+ expect("pragma");
+ string token = parse_token();
+ if(token=="MSP")
+ preprocess_pragma_msp();
+}
+
+void ProgramParser::preprocess_pragma_msp()
{
string token = peek_token();
+ if(token=="stage")
+ preprocess_stage();
+ else
+ throw runtime_error(format_error(format("Unrecognized MSP pragma '%s'", token)));
+
+ token = parse_token();
+ if(!token.empty())
+ throw runtime_error(format_syntax_error("end of line"));
+}
+
+void ProgramParser::preprocess_stage()
+{
+ if(!allow_stage_change)
+ throw runtime_error(format_error("Changing stage not allowed here"));
+
+ expect("stage");
+ expect("(");
+ string token = expect_identifier();
+ StageType stage = SHARED;
+ if(token=="vertex")
+ stage = VERTEX;
+ else if(token=="geometry")
+ stage = GEOMETRY;
+ else if(token=="fragment")
+ stage = FRAGMENT;
+ else
+ throw runtime_error(format_syntax_error("stage identifier"));
+ expect(")");
+
+ if(stage<=cur_stage->type)
+ throw runtime_error(format_error(format("Stage '%s' not allowed here", token)));
+
+ module->stages.push_back(stage);
+
+ if(cur_stage->type!=SHARED)
+ module->stages.back().previous = cur_stage;
+ cur_stage = &module->stages.back();
+}
+
+RefPtr<Node> ProgramParser::parse_global_declaration()
+{
+ allow_stage_change = true;
+ string token = peek_token();
+ allow_stage_change = false;
+
if(token=="import")
return parse_import();
+ else if(token=="precision")
+ return parse_precision();
else if(token=="layout")
{
RefPtr<Layout> layout = parse_layout();
iface_lo->layout.qualifiers = layout->qualifiers;
iface_lo->interface = parse_token();
expect(";");
- return iface_lo.release();
+ return iface_lo;
}
else
{
- VariableDeclaration *var = parse_variable_declaration();
- var->layout = layout.release();
+ RefPtr<VariableDeclaration> var = parse_variable_declaration();
+ var->layout = layout;
return var;
}
}
else if(token=="struct")
return parse_struct_declaration();
- else if(is_sampling_qualifier(token) || token=="const")
- return parse_variable_declaration();
else if(is_interface_qualifier(token))
{
- if(is_type(peek_token(1)))
+ string next = peek_token(1);
+ if(is_type(next) || is_precision_qualifier(next))
return parse_variable_declaration();
else
return parse_interface_block();
}
+ else if(is_qualifier(token))
+ return parse_variable_declaration();
else if(is_type(token))
{
if(peek_token(2)=="(")
else if(token.empty())
return 0;
else
- throw runtime_error(format("Syntax error at '%s': expected a global declaration", token));
+ throw runtime_error(format_syntax_error("a global declaration"));
}
-Node *ProgramParser::parse_statement()
+RefPtr<Node> ProgramParser::parse_statement()
{
string token = peek_token();
if(token=="if")
return parse_passthrough();
else if(token=="return")
return parse_return();
+ else if(token=="break" || token=="continue" || token=="discard")
+ {
+ RefPtr<Jump> jump = new Jump;
+ jump->keyword = parse_token();
+ expect(";");
+
+ return jump;
+ }
else if(is_qualifier(token) || is_type(token))
return parse_variable_declaration();
else if(!token.empty())
expr->expression = parse_expression();
expect(";");
- return expr.release();
+ return expr;
}
else
- throw runtime_error(format("Syntax error at '%s': expected a statement", token));
+ throw runtime_error(format_syntax_error("a statement"));
}
-Import *ProgramParser::parse_import()
+RefPtr<Import> ProgramParser::parse_import()
{
if(cur_stage->type!=SHARED)
- throw runtime_error("Imports are only allowed in the shared section");
+ throw runtime_error(format_error("Imports are only allowed in the shared section"));
expect("import");
RefPtr<Import> import = new Import;
import->module = parse_token();
expect(";");
- return import.release();
+ return import;
}
-Layout *ProgramParser::parse_layout()
+RefPtr<Precision> ProgramParser::parse_precision()
+{
+ expect("precision");
+ RefPtr<Precision> precision = new Precision;
+
+ precision->precision = parse_token();
+ if(!is_precision_qualifier(precision->precision))
+ throw runtime_error(format_syntax_error("a precision qualifier"));
+
+ precision->type = parse_token();
+ // Not entirely accurate; only float, int and sampler types are allowed
+ if(!is_builtin_type(precision->type))
+ throw runtime_error(format_syntax_error("a builtin type"));
+
+ expect(";");
+
+ return precision;
+}
+
+RefPtr<Layout> ProgramParser::parse_layout()
{
expect("layout");
expect("(");
{
string token = parse_token();
if(token==")")
- throw runtime_error(format("Parse error at '%s': expected layout qualifier id", token));
+ throw runtime_error(format_syntax_error("a layout qualifier name"));
layout->qualifiers.push_back(Layout::Qualifier());
Layout::Qualifier &qual = layout->qualifiers.back();
}
expect(")");
- return layout.release();
+ return layout;
}
void ProgramParser::parse_block(Block &block, bool require_braces)
expect("}");
}
-Expression *ProgramParser::parse_expression(unsigned precedence)
+RefPtr<Expression> ProgramParser::parse_expression(unsigned precedence)
{
RefPtr<Expression> left;
VariableReference *left_var = 0;
if(token==";" || token==")" || token=="]" || token=="," || (oper && precedence && oper->precedence>=precedence))
{
if(left)
- return left.release();
+ return left;
else
- throw runtime_error(format("Parse error at '%s': expected an expression", token));
+ throw runtime_error(format_syntax_error("an expression"));
}
else if(left)
{
if(token=="(")
{
if(!left_var)
- throw runtime_error(format("Parse error at '%s': function name must be an identifier", token));
- left = parse_function_call(left_var);
+ throw runtime_error(format_error("Syntax error before '(': function name must be an identifier"));
+ left = parse_function_call(*left_var);
}
else if(token==".")
{
RefPtr<MemberAccess> memacc = new MemberAccess;
- memacc->left = left.release();
+ memacc->left = left;
parse_token();
memacc->member = expect_identifier();
left = memacc;
RefPtr<UnaryExpression> unary = new UnaryExpression;
unary->oper = parse_token();
unary->prefix = false;
- unary->expression = left.release();
+ unary->expression = left;
left = unary;
}
else if(oper && oper->type==BINARY)
- left = parse_binary(left.release(), oper);
+ left = parse_binary(left, oper);
else
- throw runtime_error(format("Parse error at '%s': expected an operator", token));
+ throw runtime_error(format_syntax_error("an operator"));
left_var = 0;
}
else
left = unary;
}
else
- throw runtime_error(format("Parse error at '%s': expected an expression", token));
+ throw runtime_error(format_syntax_error("an expression"));
}
}
}
-BinaryExpression *ProgramParser::parse_binary(Expression *left, const Operator *oper)
+RefPtr<BinaryExpression> ProgramParser::parse_binary(const RefPtr<Expression> &left, const Operator *oper)
{
RefPtr<BinaryExpression> binary = (oper->precedence==16 ? new Assignment : new BinaryExpression);
binary->left = left;
}
else
binary->right = parse_expression(oper->precedence+(oper->assoc==RIGHT_TO_LEFT));
- return binary.release();
+ return binary;
}
-FunctionCall *ProgramParser::parse_function_call(VariableReference *var)
+RefPtr<FunctionCall> ProgramParser::parse_function_call(const VariableReference &var)
{
RefPtr<FunctionCall> call = new FunctionCall;
- call->name = var->name;
+ call->name = var.name;
call->constructor = is_type(call->name);
expect("(");
while(peek_token()!=")")
call->arguments.push_back(parse_expression());
}
expect(")");
- return call.release();
+ return call;
}
-StructDeclaration *ProgramParser::parse_struct_declaration()
+RefPtr<StructDeclaration> ProgramParser::parse_struct_declaration()
{
expect("struct");
RefPtr<StructDeclaration> strct = new StructDeclaration;
expect(";");
declared_types.insert(strct->name);
- return strct.release();
+ return strct;
}
-VariableDeclaration *ProgramParser::parse_variable_declaration()
+RefPtr<VariableDeclaration> ProgramParser::parse_variable_declaration()
{
RefPtr<VariableDeclaration> var = new VariableDeclaration;
var->sampling = parse_token();
token = peek_token();
if(!is_interface_qualifier(token))
- throw runtime_error(format("Parse error at '%s': expected an interface qualifier", token));
+ throw runtime_error(format_syntax_error("an interface qualifier"));
}
if(is_interface_qualifier(token))
parse_token();
}
+ if(is_precision_qualifier(token))
+ var->precision = parse_token();
+
var->type = expect_type();
var->name = expect_identifier();
var->init_expression = parse_expression();
expect(";");
- return var.release();
+ return var;
}
-FunctionDeclaration *ProgramParser::parse_function_declaration()
+RefPtr<FunctionDeclaration> ProgramParser::parse_function_declaration()
{
RefPtr<FunctionDeclaration> func = new FunctionDeclaration;
expect(",");
RefPtr<VariableDeclaration> var = new VariableDeclaration;
+ string token = peek_token();
+ if(token=="in" || token=="out" || token=="inout")
+ var->interface = parse_token();
var->type = expect_type();
var->name = expect_identifier();
- func->parameters.push_back(var.release());
+ func->parameters.push_back(var);
}
expect(")");
else if(token==";")
parse_token();
else
- throw runtime_error(format("Parse error at '%s': expected '{' or ';'", token));
+ throw runtime_error(format_syntax_error("'{' or ';'"));
- return func.release();
+ return func;
}
-InterfaceBlock *ProgramParser::parse_interface_block()
+RefPtr<InterfaceBlock> ProgramParser::parse_interface_block()
{
RefPtr<InterfaceBlock> iface = new InterfaceBlock;
iface->interface = parse_token();
if(!is_interface_qualifier(iface->interface))
- throw runtime_error(format("Parse error at '%s': expected an interface qualifier", iface->interface));
+ throw runtime_error(format_syntax_error("an interface qualifier"));
iface->name = expect_identifier();
parse_block(iface->members, true);
expect(";");
}
- return iface.release();
+ return iface;
}
-Conditional *ProgramParser::parse_conditional()
+RefPtr<Conditional> ProgramParser::parse_conditional()
{
expect("if");
expect("(");
parse_block(cond->else_body, false);
}
- return cond.release();
+ return cond;
}
-Iteration *ProgramParser::parse_iteration()
+RefPtr<Iteration> ProgramParser::parse_iteration()
{
expect("for");
expect("(");
RefPtr<ExpressionStatement> expr = new ExpressionStatement;
expr->expression = parse_expression();
expect(";");
- loop->init_statement = expr.release();
+ loop->init_statement = expr;
}
loop->condition = parse_expression();
expect(";");
parse_block(loop->body, false);
- return loop.release();
+ return loop;
}
-Passthrough *ProgramParser::parse_passthrough()
+RefPtr<Passthrough> ProgramParser::parse_passthrough()
{
expect("passthrough");
RefPtr<Passthrough> pass = new Passthrough;
expect("]");
}
expect(";");
- return pass.release();
+ return pass;
}
-Return *ProgramParser::parse_return()
+RefPtr<Return> ProgramParser::parse_return()
{
expect("return");
RefPtr<Return> ret = new Return;
if(peek_token()!=";")
ret->expression = parse_expression();
expect(";");
- return ret.release();
+ return ret;
}
} // namespace GL
projects / libs / gl.git / blobdiff