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gd_parser.cpp
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gd_parser.cpp
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/*************************************************************************/
/* gd_parser.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2015 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "gd_parser.h"
#include "print_string.h"
#include "io/resource_loader.h"
#include "os/file_access.h"
#include "script_language.h"
template<class T>
T* GDParser::alloc_node() {
T *t = memnew( T);
t->next=list;
list=t;
if (!head)
head=t;
t->line=tokenizer->get_token_line();
t->column=tokenizer->get_token_column();
return t;
}
bool GDParser::_end_statement() {
if (tokenizer->get_token()==GDTokenizer::TK_SEMICOLON) {
tokenizer->advance();
return true; //handle next
} else if (tokenizer->get_token()==GDTokenizer::TK_NEWLINE || tokenizer->get_token()==GDTokenizer::TK_EOF) {
return true; //will be handled properly
}
return false;
}
bool GDParser::_enter_indent_block(BlockNode* p_block) {
if (tokenizer->get_token()!=GDTokenizer::TK_COLON) {
// report location at the previous token (on the previous line)
int error_line = tokenizer->get_token_line(-1);
int error_column = tokenizer->get_token_column(-1);
_set_error("':' expected at end of line.",error_line,error_column);
return false;
}
tokenizer->advance();
if (tokenizer->get_token()!=GDTokenizer::TK_NEWLINE) {
// be more python-like
int current = tab_level.back()->get();
tab_level.push_back(current+1);
return true;
//_set_error("newline expected after ':'.");
//return false;
}
while(true) {
if (tokenizer->get_token()!=GDTokenizer::TK_NEWLINE) {
print_line("no newline");
return false; //wtf
} else if (tokenizer->get_token(1)!=GDTokenizer::TK_NEWLINE) {
int indent = tokenizer->get_token_line_indent();
int current = tab_level.back()->get();
if (indent<=current) {
print_line("current: "+itos(current)+" indent: "+itos(indent));
print_line("less than current");
return false;
}
tab_level.push_back(indent);
tokenizer->advance();
return true;
} else if (p_block) {
NewLineNode *nl = alloc_node<NewLineNode>();
nl->line=tokenizer->get_token_line();
p_block->statements.push_back(nl);
}
tokenizer->advance(); // go to next newline
}
}
bool GDParser::_parse_arguments(Node* p_parent,Vector<Node*>& p_args,bool p_static,bool p_can_codecomplete) {
if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE) {
tokenizer->advance();
} else {
int argidx=0;
while(true) {
if (tokenizer->get_token()==GDTokenizer::TK_CURSOR) {
_make_completable_call(argidx);
completion_node=p_parent;
} else if (tokenizer->get_token()==GDTokenizer::TK_CONSTANT && tokenizer->get_token_constant().get_type()==Variant::STRING && tokenizer->get_token(1)==GDTokenizer::TK_CURSOR) {
//completing a string argument..
completion_cursor=tokenizer->get_token_constant();
_make_completable_call(argidx);
completion_node=p_parent;
tokenizer->advance(1);
return false;
}
Node*arg = _parse_expression(p_parent,p_static);
if (!arg)
return false;
p_args.push_back(arg);
if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE) {
tokenizer->advance();
break;
} else if (tokenizer->get_token()==GDTokenizer::TK_COMMA) {
if (tokenizer->get_token(1)==GDTokenizer::TK_PARENTHESIS_CLOSE) {
_set_error("Expression expected");
return false;
}
tokenizer->advance();
argidx++;
} else {
// something is broken
_set_error("Expected ',' or ')'");
return false;
}
}
}
return true;
}
void GDParser::_make_completable_call(int p_arg) {
completion_cursor=StringName();
completion_type=COMPLETION_CALL_ARGUMENTS;
completion_class=current_class;
completion_function=current_function;
completion_line=tokenizer->get_token_line();
completion_argument=p_arg;
completion_block=current_block;
completion_found=true;
tokenizer->advance();
}
bool GDParser::_get_completable_identifier(CompletionType p_type,StringName& identifier) {
identifier=StringName();
if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER) {
identifier=tokenizer->get_token_identifier();
tokenizer->advance();
}
if (tokenizer->get_token()==GDTokenizer::TK_CURSOR) {
completion_cursor=identifier;
completion_type=p_type;
completion_class=current_class;
completion_function=current_function;
completion_line=tokenizer->get_token_line();
completion_block=current_block;
completion_found=true;
tokenizer->advance();
if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER) {
identifier=identifier.operator String() + tokenizer->get_token_identifier().operator String();
tokenizer->advance();
}
return true;
}
return false;
}
GDParser::Node* GDParser::_parse_expression(Node *p_parent,bool p_static,bool p_allow_assign) {
// Vector<Node*> expressions;
// Vector<OperatorNode::Operator> operators;
Vector<Expression> expression;
Node *expr=NULL;
while(true) {
/*****************/
/* Parse Operand */
/*****************/
if (parenthesis>0) {
//remove empty space (only allowed if inside parenthesis
while(tokenizer->get_token()==GDTokenizer::TK_NEWLINE) {
tokenizer->advance();
}
}
if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_OPEN) {
//subexpression ()
tokenizer->advance();
parenthesis++;
Node* subexpr = _parse_expression(p_parent,p_static);
parenthesis--;
if (!subexpr)
return NULL;
if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_CLOSE) {
_set_error("Expected ')' in expression");
return NULL;
}
tokenizer->advance();
expr=subexpr;
} else if (tokenizer->get_token()==GDTokenizer::TK_CURSOR) {
tokenizer->advance();
continue; //no point in cursor in the middle of expression
} else if (tokenizer->get_token()==GDTokenizer::TK_CONSTANT) {
//constant defined by tokenizer
ConstantNode *constant = alloc_node<ConstantNode>();
constant->value=tokenizer->get_token_constant();
tokenizer->advance();
expr=constant;
} else if (tokenizer->get_token()==GDTokenizer::TK_PR_PRELOAD) {
//constant defined by tokenizer
tokenizer->advance();
if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_OPEN) {
_set_error("Expected '(' after 'preload'");
return NULL;
}
tokenizer->advance();
if (tokenizer->get_token()!=GDTokenizer::TK_CONSTANT || tokenizer->get_token_constant().get_type()!=Variant::STRING) {
_set_error("Expected string constant as 'preload' argument.");
return NULL;
}
String path = tokenizer->get_token_constant();
if (!path.is_abs_path() && base_path!="")
path=base_path+"/"+path;
path = path.replace("///","//").simplify_path();
if (path==self_path) {
_set_error("Can't preload itself (use 'get_script()').");
return NULL;
}
Ref<Resource> res;
if (!validating) {
//this can be too slow for just validating code
if (for_completion && ScriptCodeCompletionCache::get_sigleton()) {
res = ScriptCodeCompletionCache::get_sigleton()->get_cached_resource(path);
} else {
res = ResourceLoader::load(path);
}
if (!res.is_valid()) {
_set_error("Can't preload resource at path: "+path);
return NULL;
}
} else {
if (!FileAccess::exists(path)) {
_set_error("Can't preload resource at path: "+path);
return NULL;
}
}
tokenizer->advance();
if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_CLOSE) {
_set_error("Expected ')' after 'preload' path");
return NULL;
}
ConstantNode *constant = alloc_node<ConstantNode>();
constant->value=res;
tokenizer->advance();
expr=constant;
} else if (tokenizer->get_token()==GDTokenizer::TK_PR_YIELD) {
//constant defined by tokenizer
tokenizer->advance();
if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_OPEN) {
_set_error("Expected '(' after 'yield'");
return NULL;
}
tokenizer->advance();
OperatorNode *yield = alloc_node<OperatorNode>();
yield->op=OperatorNode::OP_YIELD;
if (tokenizer->get_token()==GDTokenizer::TK_PARENTHESIS_CLOSE) {
expr=yield;
tokenizer->advance();
} else {
Node *object = _parse_and_reduce_expression(p_parent,p_static);
if (!object)
return NULL;
yield->arguments.push_back(object);
if (tokenizer->get_token()!=GDTokenizer::TK_COMMA) {
_set_error("Expected ',' after first argument of 'yield'");
return NULL;
}
tokenizer->advance();
Node *signal = _parse_and_reduce_expression(p_parent,p_static);
if (!signal)
return NULL;
yield->arguments.push_back(signal);
if (tokenizer->get_token()!=GDTokenizer::TK_PARENTHESIS_CLOSE) {
_set_error("Expected ')' after second argument of 'yield'");
return NULL;
}
tokenizer->advance();
expr=yield;
}
} else if (tokenizer->get_token()==GDTokenizer::TK_SELF) {
if (p_static) {
_set_error("'self'' not allowed in static function or constant expression");
return NULL;
}
//constant defined by tokenizer
SelfNode *self = alloc_node<SelfNode>();
tokenizer->advance();
expr=self;
} else if (tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_TYPE && tokenizer->get_token(1)==GDTokenizer::TK_PERIOD) {
Variant::Type bi_type = tokenizer->get_token_type();
tokenizer->advance(2);
StringName identifier;
if (_get_completable_identifier(COMPLETION_BUILT_IN_TYPE_CONSTANT,identifier)) {
completion_built_in_constant=bi_type;
}
if (identifier==StringName()) {
_set_error("Built-in type constant expected after '.'");
return NULL;
}
if (!Variant::has_numeric_constant(bi_type,identifier)) {
_set_error("Static constant '"+identifier.operator String()+"' not present in built-in type "+Variant::get_type_name(bi_type)+".");
return NULL;
}
ConstantNode *cn = alloc_node<ConstantNode>();
cn->value=Variant::get_numeric_constant_value(bi_type,identifier);
expr=cn;
} else if (tokenizer->get_token(1)==GDTokenizer::TK_PARENTHESIS_OPEN && (tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_TYPE || tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER || tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_FUNC)) {
//function or constructor
OperatorNode *op = alloc_node<OperatorNode>();
op->op=OperatorNode::OP_CALL;
if (tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_TYPE) {
TypeNode *tn = alloc_node<TypeNode>();
tn->vtype=tokenizer->get_token_type();
op->arguments.push_back(tn);
tokenizer->advance(2);
} else if (tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_FUNC) {
BuiltInFunctionNode *bn = alloc_node<BuiltInFunctionNode>();
bn->function=tokenizer->get_token_built_in_func();
op->arguments.push_back(bn);
tokenizer->advance(2);
} else {
SelfNode *self = alloc_node<SelfNode>();
op->arguments.push_back(self);
StringName identifier;
if (_get_completable_identifier(COMPLETION_FUNCTION,identifier)) {
}
IdentifierNode* id = alloc_node<IdentifierNode>();
id->name=identifier;
op->arguments.push_back(id);
tokenizer->advance(1);
}
if (tokenizer->get_token()==GDTokenizer::TK_CURSOR) {
_make_completable_call(0);
completion_node=op;
}
if (!_parse_arguments(op,op->arguments,p_static,true))
return NULL;
expr=op;
} else if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER) {
//identifier (reference)
const ClassNode* cln = static_cast<const ClassNode*>(get_parse_tree());
bool bfn = false;
StringName identifier;
if (_get_completable_identifier(COMPLETION_IDENTIFIER,identifier)) {
}
for( int i=0; i<cln->constant_expressions.size(); ++i ) {
if( cln->constant_expressions[i].identifier == identifier ) {
expr = cln->constant_expressions[i].expression;
bfn = true;
break;
}
}
if ( !bfn ) {
IdentifierNode *id = alloc_node<IdentifierNode>();
id->name = identifier;
expr = id;
}
} else if (/*tokenizer->get_token()==GDTokenizer::TK_OP_ADD ||*/ tokenizer->get_token()==GDTokenizer::TK_OP_SUB || tokenizer->get_token()==GDTokenizer::TK_OP_NOT || tokenizer->get_token()==GDTokenizer::TK_OP_BIT_INVERT) {
//single prefix operators like !expr -expr ++expr --expr
OperatorNode *op = alloc_node<OperatorNode>();
Expression e;
e.is_op=true;
switch(tokenizer->get_token()) {
case GDTokenizer::TK_OP_SUB: e.op=OperatorNode::OP_NEG; break;
case GDTokenizer::TK_OP_NOT: e.op=OperatorNode::OP_NOT; break;
case GDTokenizer::TK_OP_BIT_INVERT: e.op=OperatorNode::OP_BIT_INVERT;; break;
default: {}
}
tokenizer->advance();
if (e.op!=OperatorNode::OP_NOT && tokenizer->get_token()==GDTokenizer::TK_OP_NOT) {
_set_error("Misplaced 'not'.");
return NULL;
}
expression.push_back(e);
continue; //only exception, must continue...
/*
Node *subexpr=_parse_expression(op,p_static);
if (!subexpr)
return NULL;
op->arguments.push_back(subexpr);
expr=op;*/
} else if (tokenizer->get_token()==GDTokenizer::TK_BRACKET_OPEN) {
// array
tokenizer->advance();
ArrayNode *arr = alloc_node<ArrayNode>();
bool expecting_comma=false;
while(true) {
if (tokenizer->get_token()==GDTokenizer::TK_EOF) {
_set_error("Unterminated array");
return NULL;
} else if (tokenizer->get_token()==GDTokenizer::TK_BRACKET_CLOSE) {
tokenizer->advance();
break;
} else if (tokenizer->get_token()==GDTokenizer::TK_NEWLINE) {
tokenizer->advance(); //ignore newline
} else if (tokenizer->get_token()==GDTokenizer::TK_COMMA) {
if (!expecting_comma) {
_set_error("expression or ']' expected");
return NULL;
}
expecting_comma=false;
tokenizer->advance(); //ignore newline
} else {
//parse expression
if (expecting_comma) {
_set_error("',' or ']' expected");
return NULL;
}
Node *n = _parse_expression(arr,p_static);
if (!n)
return NULL;
arr->elements.push_back(n);
expecting_comma=true;
}
}
expr=arr;
} else if (tokenizer->get_token()==GDTokenizer::TK_CURLY_BRACKET_OPEN) {
// array
tokenizer->advance();
DictionaryNode *dict = alloc_node<DictionaryNode>();
enum DictExpect {
DICT_EXPECT_KEY,
DICT_EXPECT_COLON,
DICT_EXPECT_VALUE,
DICT_EXPECT_COMMA
};
Node *key=NULL;
DictExpect expecting=DICT_EXPECT_KEY;
while(true) {
if (tokenizer->get_token()==GDTokenizer::TK_EOF) {
_set_error("Unterminated dictionary");
return NULL;
} else if (tokenizer->get_token()==GDTokenizer::TK_CURLY_BRACKET_CLOSE) {
if (expecting==DICT_EXPECT_COLON) {
_set_error("':' expected");
return NULL;
}
if (expecting==DICT_EXPECT_VALUE) {
_set_error("value expected");
return NULL;
}
tokenizer->advance();
break;
} else if (tokenizer->get_token()==GDTokenizer::TK_NEWLINE) {
tokenizer->advance(); //ignore newline
} else if (tokenizer->get_token()==GDTokenizer::TK_COMMA) {
if (expecting==DICT_EXPECT_KEY) {
_set_error("key or '}' expected");
return NULL;
}
if (expecting==DICT_EXPECT_VALUE) {
_set_error("value expected");
return NULL;
}
if (expecting==DICT_EXPECT_COLON) {
_set_error("':' expected");
return NULL;
}
expecting=DICT_EXPECT_KEY;
tokenizer->advance(); //ignore newline
} else if (tokenizer->get_token()==GDTokenizer::TK_COLON) {
if (expecting==DICT_EXPECT_KEY) {
_set_error("key or '}' expected");
return NULL;
}
if (expecting==DICT_EXPECT_VALUE) {
_set_error("value expected");
return NULL;
}
if (expecting==DICT_EXPECT_COMMA) {
_set_error("',' or '}' expected");
return NULL;
}
expecting=DICT_EXPECT_VALUE;
tokenizer->advance(); //ignore newline
} else {
if (expecting==DICT_EXPECT_COMMA) {
_set_error("',' or '}' expected");
return NULL;
}
if (expecting==DICT_EXPECT_COLON) {
_set_error("':' expected");
return NULL;
}
if (expecting==DICT_EXPECT_KEY) {
if (tokenizer->get_token()==GDTokenizer::TK_IDENTIFIER && tokenizer->get_token(1)==GDTokenizer::TK_OP_ASSIGN) {
//lua style identifier, easier to write
ConstantNode *cn = alloc_node<ConstantNode>();
cn->value = tokenizer->get_token_identifier();
key = cn;
tokenizer->advance(2);
expecting=DICT_EXPECT_VALUE;
} else {
//python/js style more flexible
key = _parse_expression(dict,p_static);
if (!key)
return NULL;
expecting=DICT_EXPECT_COLON;
}
}
if (expecting==DICT_EXPECT_VALUE) {
Node *value = _parse_expression(dict,p_static);
if (!value)
return NULL;
expecting=DICT_EXPECT_COMMA;
DictionaryNode::Pair pair;
pair.key=key;
pair.value=value;
dict->elements.push_back(pair);
key=NULL;
}
}
}
expr=dict;
} else if (tokenizer->get_token()==GDTokenizer::TK_PERIOD && (tokenizer->get_token(1)==GDTokenizer::TK_IDENTIFIER || tokenizer->get_token(1)==GDTokenizer::TK_CURSOR) && tokenizer->get_token(2)==GDTokenizer::TK_PARENTHESIS_OPEN) {
// parent call
tokenizer->advance(); //goto identifier
OperatorNode *op = alloc_node<OperatorNode>();
op->op=OperatorNode::OP_PARENT_CALL;
/*SelfNode *self = alloc_node<SelfNode>();
op->arguments.push_back(self);
forbidden for now */
StringName identifier;
if (_get_completable_identifier(COMPLETION_PARENT_FUNCTION,identifier)) {
//indexing stuff
}
IdentifierNode *id = alloc_node<IdentifierNode>();
id->name=identifier;
op->arguments.push_back(id);
tokenizer->advance(1);
if (!_parse_arguments(op,op->arguments,p_static))
return NULL;
expr=op;
} else {
//find list [ or find dictionary {
print_line("found bug?");
_set_error("Error parsing expression, misplaced: "+String(tokenizer->get_token_name(tokenizer->get_token())));
return NULL; //nothing
}
if (!expr) {
ERR_EXPLAIN("GDParser bug, couldn't figure out what expression is..");
ERR_FAIL_COND_V(!expr,NULL);
}
/******************/
/* Parse Indexing */
/******************/
while (true) {
//expressions can be indexed any number of times
if (tokenizer->get_token()==GDTokenizer::TK_PERIOD) {
//indexing using "."
if (tokenizer->get_token(1)!=GDTokenizer::TK_CURSOR && tokenizer->get_token(1)!=GDTokenizer::TK_IDENTIFIER && tokenizer->get_token(1)!=GDTokenizer::TK_BUILT_IN_FUNC ) {
_set_error("Expected identifier as member");
return NULL;
} else if (tokenizer->get_token(2)==GDTokenizer::TK_PARENTHESIS_OPEN) {
//call!!
OperatorNode * op = alloc_node<OperatorNode>();
op->op=OperatorNode::OP_CALL;
tokenizer->advance();
IdentifierNode * id = alloc_node<IdentifierNode>();
if (tokenizer->get_token()==GDTokenizer::TK_BUILT_IN_FUNC ) {
//small hack so built in funcs don't obfuscate methods
id->name=GDFunctions::get_func_name(tokenizer->get_token_built_in_func());
tokenizer->advance();
} else {
StringName identifier;
if (_get_completable_identifier(COMPLETION_METHOD,identifier)) {
completion_node=op;
//indexing stuff
}
id->name=identifier;
}
op->arguments.push_back(expr); // call what
op->arguments.push_back(id); // call func
//get arguments
tokenizer->advance(1);
if (tokenizer->get_token()==GDTokenizer::TK_CURSOR) {
_make_completable_call(0);
completion_node=op;
}
if (!_parse_arguments(op,op->arguments,p_static,true))
return NULL;
expr=op;
} else {
//simple indexing!
OperatorNode * op = alloc_node<OperatorNode>();
op->op=OperatorNode::OP_INDEX_NAMED;
tokenizer->advance();
StringName identifier;
if (_get_completable_identifier(COMPLETION_INDEX,identifier)) {
if (identifier==StringName()) {
identifier="@temp"; //so it parses allright
}
completion_node=op;
//indexing stuff
}
IdentifierNode * id = alloc_node<IdentifierNode>();
id->name=identifier;
op->arguments.push_back(expr);
op->arguments.push_back(id);
expr=op;
}
} else if (tokenizer->get_token()==GDTokenizer::TK_BRACKET_OPEN) {
//indexing using "[]"
OperatorNode * op = alloc_node<OperatorNode>();
op->op=OperatorNode::OP_INDEX;
tokenizer->advance(1);
Node *subexpr = _parse_expression(op,p_static);
if (!subexpr) {
return NULL;
}
if (tokenizer->get_token()!=GDTokenizer::TK_BRACKET_CLOSE) {
_set_error("Expected ']'");
return NULL;
}
op->arguments.push_back(expr);
op->arguments.push_back(subexpr);
tokenizer->advance(1);
expr=op;
} else
break;
}
/******************/
/* Parse Operator */
/******************/
if (parenthesis>0) {
//remove empty space (only allowed if inside parenthesis
while(tokenizer->get_token()==GDTokenizer::TK_NEWLINE) {
tokenizer->advance();
}
}
Expression e;
e.is_op=false;
e.node=expr;
expression.push_back(e);
// determine which operator is next
OperatorNode::Operator op;
bool valid=true;
//assign, if allowed is only alowed on the first operator
#define _VALIDATE_ASSIGN if (!p_allow_assign) { _set_error("Unexpected assign."); return NULL; } p_allow_assign=false;
switch(tokenizer->get_token()) { //see operator
case GDTokenizer::TK_OP_IN: op=OperatorNode::OP_IN; break;
case GDTokenizer::TK_OP_EQUAL: op=OperatorNode::OP_EQUAL ; break;
case GDTokenizer::TK_OP_NOT_EQUAL: op=OperatorNode::OP_NOT_EQUAL ; break;
case GDTokenizer::TK_OP_LESS: op=OperatorNode::OP_LESS ; break;
case GDTokenizer::TK_OP_LESS_EQUAL: op=OperatorNode::OP_LESS_EQUAL ; break;
case GDTokenizer::TK_OP_GREATER: op=OperatorNode::OP_GREATER ; break;
case GDTokenizer::TK_OP_GREATER_EQUAL: op=OperatorNode::OP_GREATER_EQUAL ; break;
case GDTokenizer::TK_OP_AND: op=OperatorNode::OP_AND ; break;
case GDTokenizer::TK_OP_OR: op=OperatorNode::OP_OR ; break;
case GDTokenizer::TK_OP_ADD: op=OperatorNode::OP_ADD ; break;
case GDTokenizer::TK_OP_SUB: op=OperatorNode::OP_SUB ; break;
case GDTokenizer::TK_OP_MUL: op=OperatorNode::OP_MUL ; break;
case GDTokenizer::TK_OP_DIV: op=OperatorNode::OP_DIV ; break;
case GDTokenizer::TK_OP_MOD: op=OperatorNode::OP_MOD ; break;
//case GDTokenizer::TK_OP_NEG: op=OperatorNode::OP_NEG ; break;
case GDTokenizer::TK_OP_SHIFT_LEFT: op=OperatorNode::OP_SHIFT_LEFT ; break;
case GDTokenizer::TK_OP_SHIFT_RIGHT: op=OperatorNode::OP_SHIFT_RIGHT ; break;
case GDTokenizer::TK_OP_ASSIGN: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN ; break;
case GDTokenizer::TK_OP_ASSIGN_ADD: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_ADD ; break;
case GDTokenizer::TK_OP_ASSIGN_SUB: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_SUB ; break;
case GDTokenizer::TK_OP_ASSIGN_MUL: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_MUL ; break;
case GDTokenizer::TK_OP_ASSIGN_DIV: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_DIV ; break;
case GDTokenizer::TK_OP_ASSIGN_MOD: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_MOD ; break;
case GDTokenizer::TK_OP_ASSIGN_SHIFT_LEFT: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_SHIFT_LEFT; ; break;
case GDTokenizer::TK_OP_ASSIGN_SHIFT_RIGHT: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_SHIFT_RIGHT; ; break;
case GDTokenizer::TK_OP_ASSIGN_BIT_AND: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_BIT_AND ; break;
case GDTokenizer::TK_OP_ASSIGN_BIT_OR: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_BIT_OR ; break;
case GDTokenizer::TK_OP_ASSIGN_BIT_XOR: _VALIDATE_ASSIGN op=OperatorNode::OP_ASSIGN_BIT_XOR ; break;
case GDTokenizer::TK_OP_BIT_AND: op=OperatorNode::OP_BIT_AND ; break;
case GDTokenizer::TK_OP_BIT_OR: op=OperatorNode::OP_BIT_OR ; break;
case GDTokenizer::TK_OP_BIT_XOR: op=OperatorNode::OP_BIT_XOR ; break;
case GDTokenizer::TK_PR_EXTENDS: op=OperatorNode::OP_EXTENDS; break;
default: valid=false; break;
}
if (valid) {
e.is_op=true;
e.op=op;
expression.push_back(e);
tokenizer->advance();
} else {
break;
}
}
/* Reduce the set set of expressions and place them in an operator tree, respecting precedence */
while(expression.size()>1) {
int next_op=-1;
int min_priority=0xFFFFF;
bool is_unary=false;
for(int i=0;i<expression.size();i++) {
if (!expression[i].is_op) {
continue;
}
int priority;
bool unary=false;
switch(expression[i].op) {
case OperatorNode::OP_EXTENDS: priority=-1; break; //before anything
case OperatorNode::OP_BIT_INVERT: priority=0; unary=true; break;
case OperatorNode::OP_NEG: priority=1; unary=true; break;
case OperatorNode::OP_MUL: priority=2; break;
case OperatorNode::OP_DIV: priority=2; break;
case OperatorNode::OP_MOD: priority=2; break;
case OperatorNode::OP_ADD: priority=3; break;
case OperatorNode::OP_SUB: priority=3; break;
case OperatorNode::OP_SHIFT_LEFT: priority=4; break;
case OperatorNode::OP_SHIFT_RIGHT: priority=4; break;
case OperatorNode::OP_BIT_AND: priority=5; break;
case OperatorNode::OP_BIT_XOR: priority=6; break;
case OperatorNode::OP_BIT_OR: priority=7; break;
case OperatorNode::OP_LESS: priority=8; break;
case OperatorNode::OP_LESS_EQUAL: priority=8; break;
case OperatorNode::OP_GREATER: priority=8; break;
case OperatorNode::OP_GREATER_EQUAL: priority=8; break;
case OperatorNode::OP_EQUAL: priority=8; break;
case OperatorNode::OP_NOT_EQUAL: priority=8; break;
case OperatorNode::OP_IN: priority=10; break;
case OperatorNode::OP_NOT: priority=11; unary=true; break;
case OperatorNode::OP_AND: priority=12; break;
case OperatorNode::OP_OR: priority=13; break;
// ?: = 10
case OperatorNode::OP_ASSIGN: priority=14; break;
case OperatorNode::OP_ASSIGN_ADD: priority=14; break;
case OperatorNode::OP_ASSIGN_SUB: priority=14; break;
case OperatorNode::OP_ASSIGN_MUL: priority=14; break;
case OperatorNode::OP_ASSIGN_DIV: priority=14; break;
case OperatorNode::OP_ASSIGN_MOD: priority=14; break;
case OperatorNode::OP_ASSIGN_SHIFT_LEFT: priority=14; break;
case OperatorNode::OP_ASSIGN_SHIFT_RIGHT: priority=14; break;
case OperatorNode::OP_ASSIGN_BIT_AND: priority=14; break;
case OperatorNode::OP_ASSIGN_BIT_OR: priority=14; break;
case OperatorNode::OP_ASSIGN_BIT_XOR: priority=14; break;
default: {
_set_error("GDParser bug, invalid operator in expression: "+itos(expression[i].op));
return NULL;
}
}
if (priority<min_priority) {
// < is used for left to right (default)
// <= is used for right to left
next_op=i;
min_priority=priority;
is_unary=unary;
}
}