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tiny-js-wasm/TinyJS.cpp

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/*
* TinyJS
*
* A single-file Javascript-alike engine
*
* Authored By Gordon Williams <gw@pur3.co.uk>
*
* Copyright (C) 2009 Pur3 Ltd
*
* 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.
*/
/* Version 0.1 : (gw) First published on Google Code
Version 0.11 : Making sure the 'root' variable never changes
'symbol_base' added for the current base of the sybmbol table
Version 0.12 : Added findChildOrCreate, changed string passing to use references
Fixed broken string encoding in getJSString()
Removed getInitCode and added getJSON instead
Added nil
Added rough JSON parsing
Improved example app
Version 0.13 : Added tokenEnd/tokenLastEnd to lexer to avoid parsing whitespace
Ability to define functions without names
Can now do "var mine = function(a,b) { ... };"
Slightly better 'trace' function
Added findChildOrCreateByPath function
Added simple test suite
Added skipping of blocks when not executing
Version 0.14 : Added parsing of more number types
Added parsing of string defined with '
Changed nil to null as per spec, added 'undefined'
Now set variables with the correct scope, and treat unknown
as 'undefined' rather than failing
Added proper (I hope) handling of null and undefined
Added === check
Version 0.15 : Fix for possible memory leaks
Version 0.16 : Removal of un-needed findRecursive calls
symbol_base removed and replaced with 'scopes' stack
Added reference counting a proper tree structure
(Allowing pass by reference)
Allowed JSON output to output IDs, not strings
Added get/set for array indices
Changed Callbacks to include user data pointer
Added some support for objects
Added more Java-esque builtin functions
Version 0.17 : Now we don't deepCopy the parent object of the class
Added JSON.stringify and eval()
Nicer JSON indenting
Fixed function output in JSON
Added evaluateComplex
Fixed some reentrancy issues with evaluate/execute
Version 0.18 : Fixed some issues with code being executed when it shouldn't
Version 0.19 : Added array.length
Changed '__parent' to 'prototype' to bring it more in line with javascript
Version 0.20 : Added '%' operator
Version 0.21 : Added array type
String.length() no more - now String.length
Added extra constructors to reduce confusion
Fixed checks against undefined
Version 0.22 : First part of ardi's changes:
sprintf -> sprintf_s
extra tokens parsed
array memory leak fixed
Fixed memory leak in evaluateComplex
Fixed memory leak in FOR loops
Fixed memory leak for unary minus
Version 0.23 : Allowed evaluate[Complex] to take in semi-colon separated
statements and then only return the value from the last one.
Also checks to make sure *everything* was parsed.
Ints + doubles are now stored in binary form (faster + more precise)
Version 0.24 : More useful error for maths ops
Don't dump everything on a match error.
Version 0.25 : Better string escaping
Version 0.26 : Add CScriptVar::equals
Add built-in array functions
Version 0.27 : Added OZLB's TinyJS.setVariable (with some tweaks)
Added OZLB's Maths Functions
Version 0.28 : Ternary operator
Rudimentary call stack on error
Added String Character functions
Added shift operators
Version 0.29 : Added new object via functions
Fixed getString() for double on some platforms
Version 0.30 : Rlyeh Mario's patch for Math Functions on VC++
Version 0.31 : Add exec() to TinyJS functions
Now print quoted JSON that can be read by PHP/Python parsers
Fixed postfix increment operator
Version 0.32 : Fixed Math.randInt on 32 bit PCs, where it was broken
Version 0.33 : Fixed Memory leak + brokenness on === comparison
NOTE:
Constructing an array with an initial length 'Array(5)' doesn't work
Recursive loops of data such as a.foo = a; fail to be garbage collected
length variable cannot be set
The postfix increment operator returns the current value, not the previous as it should.
There is no prefix increment operator
Arrays are implemented as a linked list - hence a lookup time is O(n)
TODO:
Utility va-args style function in TinyJS for executing a function directly
Merge the parsing of expressions/statements so eval("statement") works like we'd expect.
Move 'shift' implementation into mathsOp
*/
#include "TinyJS.h"
#include <assert.h>
#define ASSERT(X) assert(X)
/* Frees the given link IF it isn't owned by anything else */
#define CLEAN(x) { CScriptVarLink *__v = x; if (__v && !__v->owned) { delete __v; } }
/* Create a LINK to point to VAR and free the old link.
* BUT this is more clever - it tries to keep the old link if it's not owned to save allocations */
#define CREATE_LINK(LINK, VAR) { if (!LINK || LINK->owned) LINK = new CScriptVarLink(VAR); else LINK->replaceWith(VAR); }
#include <string>
#include <string.h>
#include <sstream>
#include <cstdlib>
#include <stdio.h>
using namespace std;
#ifdef _WIN32
#ifdef _DEBUG
#ifndef DBG_NEW
#define DBG_NEW new ( _NORMAL_BLOCK , __FILE__ , __LINE__ )
#define new DBG_NEW
#endif
#endif
#endif
#ifdef __GNUC__
#define vsprintf_s vsnprintf
#define sprintf_s snprintf
#define _strdup strdup
#endif
// ----------------------------------------------------------------------------------- Memory Debug
#define DEBUG_MEMORY 0
#if DEBUG_MEMORY
vector<CScriptVar*> allocatedVars;
vector<CScriptVarLink*> allocatedLinks;
void mark_allocated(CScriptVar *v) {
allocatedVars.push_back(v);
}
void mark_deallocated(CScriptVar *v) {
for (size_t i=0;i<allocatedVars.size();i++) {
if (allocatedVars[i] == v) {
allocatedVars.erase(allocatedVars.begin()+i);
break;
}
}
}
void mark_allocated(CScriptVarLink *v) {
allocatedLinks.push_back(v);
}
void mark_deallocated(CScriptVarLink *v) {
for (size_t i=0;i<allocatedLinks.size();i++) {
if (allocatedLinks[i] == v) {
allocatedLinks.erase(allocatedLinks.begin()+i);
break;
}
}
}
void show_allocated() {
for (size_t i=0;i<allocatedVars.size();i++) {
printf("ALLOCATED, %d refs\n", allocatedVars[i]->getRefs());
allocatedVars[i]->trace(" ");
}
for (size_t i=0;i<allocatedLinks.size();i++) {
printf("ALLOCATED LINK %s, allocated[%d] to \n", allocatedLinks[i]->name.c_str(), allocatedLinks[i]->var->getRefs());
allocatedLinks[i]->var->trace(" ");
}
allocatedVars.clear();
allocatedLinks.clear();
}
#endif
// ----------------------------------------------------------------------------------- Utils
bool isWhitespace(char ch) {
return (ch==' ') || (ch=='\t') || (ch=='\n') || (ch=='\r');
}
bool isNumeric(char ch) {
return (ch>='0') && (ch<='9');
}
bool isNumber(const string &str) {
for (size_t i=0;i<str.size();i++)
if (!isNumeric(str[i])) return false;
return true;
}
bool isHexadecimal(char ch) {
return ((ch>='0') && (ch<='9')) ||
((ch>='a') && (ch<='f')) ||
((ch>='A') && (ch<='F'));
}
bool isAlpha(char ch) {
return ((ch>='a') && (ch<='z')) || ((ch>='A') && (ch<='Z')) || ch=='_';
}
bool isIDString(const char *s) {
if (!isAlpha(*s))
return false;
while (*s) {
if (!(isAlpha(*s) || isNumeric(*s)))
return false;
s++;
}
return true;
}
void replace(string &str, char textFrom, const char *textTo) {
int sLen = strlen(textTo);
size_t p = str.find(textFrom);
while (p != string::npos) {
str = str.substr(0, p) + textTo + str.substr(p+1);
p = str.find(textFrom, p+sLen);
}
}
/// convert the given string into a quoted string suitable for javascript
std::string getJSString(const std::string &str) {
std::string nStr = str;
for (size_t i=0;i<nStr.size();i++) {
const char *replaceWith = "";
bool replace = true;
switch (nStr[i]) {
case '\\': replaceWith = "\\\\"; break;
case '\n': replaceWith = "\\n"; break;
case '\r': replaceWith = "\\r"; break;
case '\a': replaceWith = "\\a"; break;
case '"': replaceWith = "\\\""; break;
default: {
int nCh = ((int)nStr[i]) &0xFF;
if (nCh<32 || nCh>127) {
char buffer[5];
sprintf_s(buffer, 5, "\\x%02X", nCh);
replaceWith = buffer;
} else replace=false;
}
}
if (replace) {
nStr = nStr.substr(0, i) + replaceWith + nStr.substr(i+1);
i += strlen(replaceWith)-1;
}
}
return "\"" + nStr + "\"";
}
/** Is the string alphanumeric */
bool isAlphaNum(const std::string &str) {
if (str.size()==0) return true;
if (!isAlpha(str[0])) return false;
for (size_t i=0;i<str.size();i++)
if (!(isAlpha(str[i]) || isNumeric(str[i])))
return false;
return true;
}
// ----------------------------------------------------------------------------------- CSCRIPTEXCEPTION
CScriptException::CScriptException(const string &exceptionText) {
text = exceptionText;
}
// ----------------------------------------------------------------------------------- CSCRIPTLEX
CScriptLex::CScriptLex(const string &input) {
data = _strdup(input.c_str());
dataOwned = true;
dataStart = 0;
dataEnd = strlen(data);
reset();
}
CScriptLex::CScriptLex(CScriptLex *owner, int startChar, int endChar) {
data = owner->data;
dataOwned = false;
dataStart = startChar;
dataEnd = endChar;
reset();
}
CScriptLex::~CScriptLex(void)
{
if (dataOwned)
free((void*)data);
}
void CScriptLex::reset() {
dataPos = dataStart;
tokenStart = 0;
tokenEnd = 0;
tokenLastEnd = 0;
tk = 0;
tkStr = "";
getNextCh();
getNextCh();
getNextToken();
}
void CScriptLex::match(int expected_tk) {
if (tk!=expected_tk) {
ostringstream errorString;
errorString << "Got " << getTokenStr(tk) << " expected " << getTokenStr(expected_tk)
<< " at " << getPosition(tokenStart);
throw new CScriptException(errorString.str());
}
getNextToken();
}
string CScriptLex::getTokenStr(int token) {
if (token>32 && token<128) {
char buf[4] = "' '";
buf[1] = (char)token;
return buf;
}
switch (token) {
case LEX_EOF : return "EOF";
case LEX_ID : return "ID";
case LEX_INT : return "INT";
case LEX_FLOAT : return "FLOAT";
case LEX_STR : return "STRING";
case LEX_EQUAL : return "==";
case LEX_TYPEEQUAL : return "===";
case LEX_NEQUAL : return "!=";
case LEX_NTYPEEQUAL : return "!==";
case LEX_LEQUAL : return "<=";
case LEX_LSHIFT : return "<<";
case LEX_LSHIFTEQUAL : return "<<=";
case LEX_GEQUAL : return ">=";
case LEX_RSHIFT : return ">>";
case LEX_RSHIFTUNSIGNED : return ">>";
case LEX_RSHIFTEQUAL : return ">>=";
case LEX_PLUSEQUAL : return "+=";
case LEX_MINUSEQUAL : return "-=";
case LEX_PLUSPLUS : return "++";
case LEX_MINUSMINUS : return "--";
case LEX_ANDEQUAL : return "&=";
case LEX_ANDAND : return "&&";
case LEX_OREQUAL : return "|=";
case LEX_OROR : return "||";
case LEX_XOREQUAL : return "^=";
// reserved words
case LEX_R_IF : return "if";
case LEX_R_ELSE : return "else";
case LEX_R_DO : return "do";
case LEX_R_WHILE : return "while";
case LEX_R_FOR : return "for";
case LEX_R_BREAK : return "break";
case LEX_R_CONTINUE : return "continue";
case LEX_R_FUNCTION : return "function";
case LEX_R_RETURN : return "return";
case LEX_R_VAR : return "var";
case LEX_R_TRUE : return "true";
case LEX_R_FALSE : return "false";
case LEX_R_NULL : return "null";
case LEX_R_UNDEFINED : return "undefined";
case LEX_R_NEW : return "new";
}
ostringstream msg;
msg << "?[" << token << "]";
return msg.str();
}
void CScriptLex::getNextCh() {
currCh = nextCh;
if (dataPos < dataEnd)
nextCh = data[dataPos];
else
nextCh = 0;
dataPos++;
}
void CScriptLex::getNextToken() {
tk = LEX_EOF;
tkStr.clear();
while (currCh && isWhitespace(currCh)) getNextCh();
// newline comments
if (currCh=='/' && nextCh=='/') {
while (currCh && currCh!='\n') getNextCh();
getNextCh();
getNextToken();
return;
}
// block comments
if (currCh=='/' && nextCh=='*') {
while (currCh && (currCh!='*' || nextCh!='/')) getNextCh();
getNextCh();
getNextCh();
getNextToken();
return;
}
// record beginning of this token
tokenStart = dataPos-2;
// tokens
if (isAlpha(currCh)) { // IDs
while (isAlpha(currCh) || isNumeric(currCh)) {
tkStr += currCh;
getNextCh();
}
tk = LEX_ID;
if (tkStr=="if") tk = LEX_R_IF;
else if (tkStr=="else") tk = LEX_R_ELSE;
else if (tkStr=="do") tk = LEX_R_DO;
else if (tkStr=="while") tk = LEX_R_WHILE;
else if (tkStr=="for") tk = LEX_R_FOR;
else if (tkStr=="break") tk = LEX_R_BREAK;
else if (tkStr=="continue") tk = LEX_R_CONTINUE;
else if (tkStr=="function") tk = LEX_R_FUNCTION;
else if (tkStr=="return") tk = LEX_R_RETURN;
else if (tkStr=="var") tk = LEX_R_VAR;
else if (tkStr=="true") tk = LEX_R_TRUE;
else if (tkStr=="false") tk = LEX_R_FALSE;
else if (tkStr=="null") tk = LEX_R_NULL;
else if (tkStr=="undefined") tk = LEX_R_UNDEFINED;
else if (tkStr=="new") tk = LEX_R_NEW;
} else if (isNumeric(currCh)) { // Numbers
bool isHex = false;
if (currCh=='0') { tkStr += currCh; getNextCh(); }
if (currCh=='x') {
isHex = true;
tkStr += currCh; getNextCh();
}
tk = LEX_INT;
while (isNumeric(currCh) || (isHex && isHexadecimal(currCh))) {
tkStr += currCh;
getNextCh();
}
if (!isHex && currCh=='.') {
tk = LEX_FLOAT;
tkStr += '.';
getNextCh();
while (isNumeric(currCh)) {
tkStr += currCh;
getNextCh();
}
}
// do fancy e-style floating point
if (!isHex && (currCh=='e'||currCh=='E')) {
tk = LEX_FLOAT;
tkStr += currCh; getNextCh();
if (currCh=='-') { tkStr += currCh; getNextCh(); }
while (isNumeric(currCh)) {
tkStr += currCh; getNextCh();
}
}
} else if (currCh=='"') {
// strings...
getNextCh();
while (currCh && currCh!='"') {
if (currCh == '\\') {
getNextCh();
switch (currCh) {
case 'n' : tkStr += '\n'; break;
case '"' : tkStr += '"'; break;
case '\\' : tkStr += '\\'; break;
default: tkStr += currCh;
}
} else {
tkStr += currCh;
}
getNextCh();
}
getNextCh();
tk = LEX_STR;
} else if (currCh=='\'') {
// strings again...
getNextCh();
while (currCh && currCh!='\'') {
if (currCh == '\\') {
getNextCh();
switch (currCh) {
case 'n' : tkStr += '\n'; break;
case 'a' : tkStr += '\a'; break;
case 'r' : tkStr += '\r'; break;
case 't' : tkStr += '\t'; break;
case '\'' : tkStr += '\''; break;
case '\\' : tkStr += '\\'; break;
case 'x' : { // hex digits
char buf[3] = "??";
getNextCh(); buf[0] = currCh;
getNextCh(); buf[1] = currCh;
tkStr += (char)strtol(buf,0,16);
} break;
default: if (currCh>='0' && currCh<='7') {
// octal digits
char buf[4] = "???";
buf[0] = currCh;
getNextCh(); buf[1] = currCh;
getNextCh(); buf[2] = currCh;
tkStr += (char)strtol(buf,0,8);
} else
tkStr += currCh;
}
} else {
tkStr += currCh;
}
getNextCh();
}
getNextCh();
tk = LEX_STR;
} else {
// single chars
tk = currCh;
if (currCh) getNextCh();
if (tk=='=' && currCh=='=') { // ==
tk = LEX_EQUAL;
getNextCh();
if (currCh=='=') { // ===
tk = LEX_TYPEEQUAL;
getNextCh();
}
} else if (tk=='!' && currCh=='=') { // !=
tk = LEX_NEQUAL;
getNextCh();
if (currCh=='=') { // !==
tk = LEX_NTYPEEQUAL;
getNextCh();
}
} else if (tk=='<' && currCh=='=') {
tk = LEX_LEQUAL;
getNextCh();
} else if (tk=='<' && currCh=='<') {
tk = LEX_LSHIFT;
getNextCh();
if (currCh=='=') { // <<=
tk = LEX_LSHIFTEQUAL;
getNextCh();
}
} else if (tk=='>' && currCh=='=') {
tk = LEX_GEQUAL;
getNextCh();
} else if (tk=='>' && currCh=='>') {
tk = LEX_RSHIFT;
getNextCh();
if (currCh=='=') { // >>=
tk = LEX_RSHIFTEQUAL;
getNextCh();
} else if (currCh=='>') { // >>>
tk = LEX_RSHIFTUNSIGNED;
getNextCh();
}
} else if (tk=='+' && currCh=='=') {
tk = LEX_PLUSEQUAL;
getNextCh();
} else if (tk=='-' && currCh=='=') {
tk = LEX_MINUSEQUAL;
getNextCh();
} else if (tk=='+' && currCh=='+') {
tk = LEX_PLUSPLUS;
getNextCh();
} else if (tk=='-' && currCh=='-') {
tk = LEX_MINUSMINUS;
getNextCh();
} else if (tk=='&' && currCh=='=') {
tk = LEX_ANDEQUAL;
getNextCh();
} else if (tk=='&' && currCh=='&') {
tk = LEX_ANDAND;
getNextCh();
} else if (tk=='|' && currCh=='=') {
tk = LEX_OREQUAL;
getNextCh();
} else if (tk=='|' && currCh=='|') {
tk = LEX_OROR;
getNextCh();
} else if (tk=='^' && currCh=='=') {
tk = LEX_XOREQUAL;
getNextCh();
}
}
/* This isn't quite right yet */
tokenLastEnd = tokenEnd;
tokenEnd = dataPos-3;
}
string CScriptLex::getSubString(int lastPosition) {
int lastCharIdx = tokenLastEnd+1;
if (lastCharIdx < dataEnd) {
/* save a memory alloc by using our data array to create the
substring */
char old = data[lastCharIdx];
data[lastCharIdx] = 0;
std::string value = &data[lastPosition];
data[lastCharIdx] = old;
return value;
} else {
return std::string(&data[lastPosition]);
}
}
CScriptLex *CScriptLex::getSubLex(int lastPosition) {
int lastCharIdx = tokenLastEnd+1;
if (lastCharIdx < dataEnd)
return new CScriptLex(this, lastPosition, lastCharIdx);
else
return new CScriptLex(this, lastPosition, dataEnd );
}
string CScriptLex::getPosition(int pos) {
if (pos<0) pos=tokenLastEnd;
int line = 1,col = 1;
for (int i=0;i<pos;i++) {
char ch;
if (i < dataEnd)
ch = data[i];
else
ch = 0;
col++;
if (ch=='\n') {
line++;
col = 0;
}
}
char buf[256];
sprintf_s(buf, 256, "(line: %d, col: %d)", line, col);
return buf;
}
// ----------------------------------------------------------------------------------- CSCRIPTVARLINK
CScriptVarLink::CScriptVarLink(CScriptVar *var, const std::string &name) {
#if DEBUG_MEMORY
mark_allocated(this);
#endif
this->name = name;
this->nextSibling = 0;
this->prevSibling = 0;
this->var = var->ref();
this->owned = false;
}
CScriptVarLink::CScriptVarLink(const CScriptVarLink &link) {
// Copy constructor
#if DEBUG_MEMORY
mark_allocated(this);
#endif
this->name = link.name;
this->nextSibling = 0;
this->prevSibling = 0;
this->var = link.var->ref();
this->owned = false;
}
CScriptVarLink::~CScriptVarLink() {
#if DEBUG_MEMORY
mark_deallocated(this);
#endif
var->unref();
}
void CScriptVarLink::replaceWith(CScriptVar *newVar) {
CScriptVar *oldVar = var;
var = newVar->ref();
oldVar->unref();
}
void CScriptVarLink::replaceWith(CScriptVarLink *newVar) {
if (newVar)
replaceWith(newVar->var);
else
replaceWith(new CScriptVar());
}
int CScriptVarLink::getIntName() {
return atoi(name.c_str());
}
void CScriptVarLink::setIntName(int n) {
char sIdx[64];
sprintf_s(sIdx, sizeof(sIdx), "%d", n);
name = sIdx;
}
// ----------------------------------------------------------------------------------- CSCRIPTVAR
CScriptVar::CScriptVar() {
refs = 0;
#if DEBUG_MEMORY
mark_allocated(this);
#endif
init();
flags = SCRIPTVAR_UNDEFINED;
}
CScriptVar::CScriptVar(const string &str) {
refs = 0;
#if DEBUG_MEMORY
mark_allocated(this);
#endif
init();
flags = SCRIPTVAR_STRING;
data = str;
}
CScriptVar::CScriptVar(const string &varData, int varFlags) {
refs = 0;
#if DEBUG_MEMORY
mark_allocated(this);
#endif
init();
flags = varFlags;
if (varFlags & SCRIPTVAR_INTEGER) {
intData = strtol(varData.c_str(),0,0);
} else if (varFlags & SCRIPTVAR_DOUBLE) {
doubleData = strtod(varData.c_str(),0);
} else
data = varData;
}
CScriptVar::CScriptVar(double val) {
refs = 0;
#if DEBUG_MEMORY
mark_allocated(this);
#endif
init();
setDouble(val);
}
CScriptVar::CScriptVar(int val) {
refs = 0;
#if DEBUG_MEMORY
mark_allocated(this);
#endif
init();
setInt(val);
}
CScriptVar::~CScriptVar(void) {
#if DEBUG_MEMORY
mark_deallocated(this);
#endif
removeAllChildren();
}
void CScriptVar::init() {
firstChild = 0;
lastChild = 0;
flags = 0;
jsCallback = 0;
jsCallbackUserData = 0;
data = TINYJS_BLANK_DATA;
intData = 0;
doubleData = 0;
}
CScriptVar *CScriptVar::getReturnVar() {
return getParameter(TINYJS_RETURN_VAR);
}
void CScriptVar::setReturnVar(CScriptVar *var) {
findChildOrCreate(TINYJS_RETURN_VAR)->replaceWith(var);
}
CScriptVar *CScriptVar::getParameter(const std::string &name) {
return findChildOrCreate(name)->var;
}
CScriptVarLink *CScriptVar::findChild(const string &childName) {
CScriptVarLink *v = firstChild;
while (v) {
if (v->name.compare(childName)==0)
return v;
v = v->nextSibling;
}
return 0;
}
CScriptVarLink *CScriptVar::findChildOrCreate(const string &childName, int varFlags) {
CScriptVarLink *l = findChild(childName);
if (l) return l;
return addChild(childName, new CScriptVar(TINYJS_BLANK_DATA, varFlags));
}
CScriptVarLink *CScriptVar::findChildOrCreateByPath(const std::string &path) {
size_t p = path.find('.');
if (p == string::npos)
return findChildOrCreate(path);
return findChildOrCreate(path.substr(0,p), SCRIPTVAR_OBJECT)->var->
findChildOrCreateByPath(path.substr(p+1));
}
CScriptVarLink *CScriptVar::addChild(const std::string &childName, CScriptVar *child) {
if (isUndefined()) {
flags = SCRIPTVAR_OBJECT;
}
// if no child supplied, create one
if (!child)
child = new CScriptVar();
CScriptVarLink *link = new CScriptVarLink(child, childName);
link->owned = true;
if (lastChild) {
lastChild->nextSibling = link;
link->prevSibling = lastChild;
lastChild = link;
} else {
firstChild = link;
lastChild = link;
}
return link;
}
CScriptVarLink *CScriptVar::addChildNoDup(const std::string &childName, CScriptVar *child) {
// if no child supplied, create one
if (!child)
child = new CScriptVar();
CScriptVarLink *v = findChild(childName);
if (v) {
v->replaceWith(child);
} else {
v = addChild(childName, child);
}
return v;
}
void CScriptVar::removeChild(CScriptVar *child) {
CScriptVarLink *link = firstChild;
while (link) {
if (link->var == child)
break;
link = link->nextSibling;
}
ASSERT(link);
removeLink(link);
}
void CScriptVar::removeLink(CScriptVarLink *link) {
if (!link) return;
if (link->nextSibling)
link->nextSibling->prevSibling = link->prevSibling;
if (link->prevSibling)
link->prevSibling->nextSibling = link->nextSibling;
if (lastChild == link)
lastChild = link->prevSibling;
if (firstChild == link)
firstChild = link->nextSibling;
delete link;
}
void CScriptVar::removeAllChildren() {
CScriptVarLink *c = firstChild;
while (c) {
CScriptVarLink *t = c->nextSibling;
delete c;
c = t;
}
firstChild = 0;
lastChild = 0;
}
CScriptVar *CScriptVar::getArrayIndex(int idx) {
char sIdx[64];
sprintf_s(sIdx, sizeof(sIdx), "%d", idx);
CScriptVarLink *link = findChild(sIdx);
if (link) return link->var;
else return new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_NULL); // undefined
}
void CScriptVar::setArrayIndex(int idx, CScriptVar *value) {
char sIdx[64];
sprintf_s(sIdx, sizeof(sIdx), "%d", idx);
CScriptVarLink *link = findChild(sIdx);
if (link) {
if (value->isUndefined())
removeLink(link);
else
link->replaceWith(value);
} else {
if (!value->isUndefined())
addChild(sIdx, value);
}
}
int CScriptVar::getArrayLength() {
int highest = -1;
if (!isArray()) return 0;
CScriptVarLink *link = firstChild;
while (link) {
if (isNumber(link->name)) {
int val = atoi(link->name.c_str());
if (val > highest) highest = val;
}
link = link->nextSibling;
}
return highest+1;
}
int CScriptVar::getChildren() {
int n = 0;
CScriptVarLink *link = firstChild;
while (link) {
n++;
link = link->nextSibling;
}
return n;
}
int CScriptVar::getInt() {
/* strtol understands about hex and octal */
if (isInt()) return intData;
if (isNull()) return 0;
if (isUndefined()) return 0;
if (isDouble()) return (int)doubleData;
return 0;
}
double CScriptVar::getDouble() {
if (isDouble()) return doubleData;
if (isInt()) return intData;
if (isNull()) return 0;
if (isUndefined()) return 0;
return 0; /* or NaN? */
}
const string &CScriptVar::getString() {
/* Because we can't return a string that is generated on demand.
* I should really just use char* :) */
static string s_null = "null";
static string s_undefined = "undefined";
if (isInt()) {
char buffer[32];
sprintf_s(buffer, sizeof(buffer), "%ld", intData);
data = buffer;
return data;
}
if (isDouble()) {
char buffer[32];
sprintf_s(buffer, sizeof(buffer), "%f", doubleData);
data = buffer;
return data;
}
if (isNull()) return s_null;
if (isUndefined()) return s_undefined;
// are we just a string here?
return data;
}
void CScriptVar::setInt(int val) {
flags = (flags&~SCRIPTVAR_VARTYPEMASK) | SCRIPTVAR_INTEGER;
intData = val;
doubleData = 0;
data = TINYJS_BLANK_DATA;
}
void CScriptVar::setDouble(double val) {
flags = (flags&~SCRIPTVAR_VARTYPEMASK) | SCRIPTVAR_DOUBLE;
doubleData = val;
intData = 0;
data = TINYJS_BLANK_DATA;
}
void CScriptVar::setString(const string &str) {
// name sure it's not still a number or integer
flags = (flags&~SCRIPTVAR_VARTYPEMASK) | SCRIPTVAR_STRING;
data = str;
intData = 0;
doubleData = 0;
}
void CScriptVar::setUndefined() {
// name sure it's not still a number or integer
flags = (flags&~SCRIPTVAR_VARTYPEMASK) | SCRIPTVAR_UNDEFINED;
data = TINYJS_BLANK_DATA;
intData = 0;
doubleData = 0;
removeAllChildren();
}
void CScriptVar::setArray() {
// name sure it's not still a number or integer
flags = (flags&~SCRIPTVAR_VARTYPEMASK) | SCRIPTVAR_ARRAY;
data = TINYJS_BLANK_DATA;
intData = 0;
doubleData = 0;
removeAllChildren();
}
bool CScriptVar::equals(CScriptVar *v) {
CScriptVar *resV = mathsOp(v, LEX_EQUAL);
bool res = resV->getBool();
delete resV;
return res;
}
CScriptVar *CScriptVar::mathsOp(CScriptVar *b, int op) {
CScriptVar *a = this;
// Type equality check
if (op == LEX_TYPEEQUAL || op == LEX_NTYPEEQUAL) {
// check type first, then call again to check data
bool eql = ((a->flags & SCRIPTVAR_VARTYPEMASK) ==
(b->flags & SCRIPTVAR_VARTYPEMASK));
if (eql) {
CScriptVar *contents = a->mathsOp(b, LEX_EQUAL);
if (!contents->getBool()) eql = false;
if (!contents->refs) delete contents;
}
;
if (op == LEX_TYPEEQUAL)
return new CScriptVar(eql);
else
return new CScriptVar(!eql);
}
// do maths...
if (a->isUndefined() && b->isUndefined()) {
if (op == LEX_EQUAL) return new CScriptVar(true);
else if (op == LEX_NEQUAL) return new CScriptVar(false);
else return new CScriptVar(); // undefined
} else if ((a->isNumeric() || a->isUndefined()) &&
(b->isNumeric() || b->isUndefined())) {
if (!a->isDouble() && !b->isDouble()) {
// use ints
int da = a->getInt();
int db = b->getInt();
switch (op) {
case '+': return new CScriptVar(da+db);
case '-': return new CScriptVar(da-db);
case '*': return new CScriptVar(da*db);
case '/': return new CScriptVar(da/db);
case '&': return new CScriptVar(da&db);
case '|': return new CScriptVar(da|db);
case '^': return new CScriptVar(da^db);
case '%': return new CScriptVar(da%db);
case LEX_EQUAL: return new CScriptVar(da==db);
case LEX_NEQUAL: return new CScriptVar(da!=db);
case '<': return new CScriptVar(da<db);
case LEX_LEQUAL: return new CScriptVar(da<=db);
case '>': return new CScriptVar(da>db);
case LEX_GEQUAL: return new CScriptVar(da>=db);
default: throw new CScriptException("Operation "+CScriptLex::getTokenStr(op)+" not supported on the Int datatype");
}
} else {
// use doubles
double da = a->getDouble();
double db = b->getDouble();
switch (op) {
case '+': return new CScriptVar(da+db);
case '-': return new CScriptVar(da-db);
case '*': return new CScriptVar(da*db);
case '/': return new CScriptVar(da/db);
case LEX_EQUAL: return new CScriptVar(da==db);
case LEX_NEQUAL: return new CScriptVar(da!=db);
case '<': return new CScriptVar(da<db);
case LEX_LEQUAL: return new CScriptVar(da<=db);
case '>': return new CScriptVar(da>db);
case LEX_GEQUAL: return new CScriptVar(da>=db);
default: throw new CScriptException("Operation "+CScriptLex::getTokenStr(op)+" not supported on the Double datatype");
}
}
} else if (a->isArray()) {
/* Just check pointers */
switch (op) {
case LEX_EQUAL: return new CScriptVar(a==b);
case LEX_NEQUAL: return new CScriptVar(a!=b);
default: throw new CScriptException("Operation "+CScriptLex::getTokenStr(op)+" not supported on the Array datatype");
}
} else if (a->isObject()) {
/* Just check pointers */
switch (op) {
case LEX_EQUAL: return new CScriptVar(a==b);
case LEX_NEQUAL: return new CScriptVar(a!=b);
default: throw new CScriptException("Operation "+CScriptLex::getTokenStr(op)+" not supported on the Object datatype");
}
} else {
string da = a->getString();
string db = b->getString();
// use strings
switch (op) {
case '+': return new CScriptVar(da+db, SCRIPTVAR_STRING);
case LEX_EQUAL: return new CScriptVar(da==db);
case LEX_NEQUAL: return new CScriptVar(da!=db);
case '<': return new CScriptVar(da<db);
case LEX_LEQUAL: return new CScriptVar(da<=db);
case '>': return new CScriptVar(da>db);
case LEX_GEQUAL: return new CScriptVar(da>=db);
default: throw new CScriptException("Operation "+CScriptLex::getTokenStr(op)+" not supported on the string datatype");
}
}
ASSERT(0);
return 0;
}
void CScriptVar::copySimpleData(CScriptVar *val) {
data = val->data;
intData = val->intData;
doubleData = val->doubleData;
flags = (flags & ~SCRIPTVAR_VARTYPEMASK) | (val->flags & SCRIPTVAR_VARTYPEMASK);
}
void CScriptVar::copyValue(CScriptVar *val) {
if (val) {
copySimpleData(val);
// remove all current children
removeAllChildren();
// copy children of 'val'
CScriptVarLink *child = val->firstChild;
while (child) {
CScriptVar *copied;
// don't copy the 'parent' object...
if (child->name != TINYJS_PROTOTYPE_CLASS)
copied = child->var->deepCopy();
else
copied = child->var;
addChild(child->name, copied);
child = child->nextSibling;
}
} else {
setUndefined();
}
}
CScriptVar *CScriptVar::deepCopy() {
CScriptVar *newVar = new CScriptVar();
newVar->copySimpleData(this);
// copy children
CScriptVarLink *child = firstChild;
while (child) {
CScriptVar *copied;
// don't copy the 'parent' object...
if (child->name != TINYJS_PROTOTYPE_CLASS)
copied = child->var->deepCopy();
else
copied = child->var;
newVar->addChild(child->name, copied);
child = child->nextSibling;
}
return newVar;
}
void CScriptVar::trace(string indentStr, const string &name) {
TRACE("%s'%s' = '%s' %s\n",
indentStr.c_str(),
name.c_str(),
getString().c_str(),
getFlagsAsString().c_str());
string indent = indentStr+" ";
CScriptVarLink *link = firstChild;
while (link) {
link->var->trace(indent, link->name);
link = link->nextSibling;
}
}
string CScriptVar::getFlagsAsString() {
string flagstr = "";
if (flags&SCRIPTVAR_FUNCTION) flagstr = flagstr + "FUNCTION ";
if (flags&SCRIPTVAR_OBJECT) flagstr = flagstr + "OBJECT ";
if (flags&SCRIPTVAR_ARRAY) flagstr = flagstr + "ARRAY ";
if (flags&SCRIPTVAR_NATIVE) flagstr = flagstr + "NATIVE ";
if (flags&SCRIPTVAR_DOUBLE) flagstr = flagstr + "DOUBLE ";
if (flags&SCRIPTVAR_INTEGER) flagstr = flagstr + "INTEGER ";
if (flags&SCRIPTVAR_STRING) flagstr = flagstr + "STRING ";
return flagstr;
}
string CScriptVar::getParsableString() {
// Numbers can just be put in directly
if (isNumeric())
return getString();
if (isFunction()) {
ostringstream funcStr;
funcStr << "function (";
// get list of parameters
CScriptVarLink *link = firstChild;
while (link) {
funcStr << link->name;
if (link->nextSibling) funcStr << ",";
link = link->nextSibling;
}
// add function body
funcStr << ") " << getString();
return funcStr.str();
}
// if it is a string then we quote it
if (isString())
return getJSString(getString());
if (isNull())
return "null";
return "undefined";
}
void CScriptVar::getJSON(ostringstream &destination, const string linePrefix) {
if (isObject()) {
string indentedLinePrefix = linePrefix+" ";
// children - handle with bracketed list
destination << "{ \n";
CScriptVarLink *link = firstChild;
while (link) {
destination << indentedLinePrefix;
destination << getJSString(link->name);
destination << " : ";
link->var->getJSON(destination, indentedLinePrefix);
link = link->nextSibling;
if (link) {
destination << ",\n";
}
}
destination << "\n" << linePrefix << "}";
} else if (isArray()) {
string indentedLinePrefix = linePrefix+" ";
destination << "[\n";
int len = getArrayLength();
if (len>10000) len=10000; // we don't want to get stuck here!
for (int i=0;i<len;i++) {
getArrayIndex(i)->getJSON(destination, indentedLinePrefix);
if (i<len-1) destination << ",\n";
}
destination << "\n" << linePrefix << "]";
} else {
// no children or a function... just write value directly
destination << getParsableString();
}
}
void CScriptVar::setCallback(JSCallback callback, void *userdata) {
jsCallback = callback;
jsCallbackUserData = userdata;
}
CScriptVar *CScriptVar::ref() {
refs++;
return this;
}
void CScriptVar::unref() {
if (refs<=0) printf("OMFG, we have unreffed too far!\n");
if ((--refs)==0) {
delete this;
}
}
int CScriptVar::getRefs() {
return refs;
}
// ----------------------------------------------------------------------------------- CSCRIPT
CTinyJS::CTinyJS() {
l = 0;
root = (new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT))->ref();
// Add built-in classes
stringClass = (new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT))->ref();
arrayClass = (new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT))->ref();
objectClass = (new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT))->ref();
root->addChild("String", stringClass);
root->addChild("Array", arrayClass);
root->addChild("Object", objectClass);
}
CTinyJS::~CTinyJS() {
ASSERT(!l);
scopes.clear();
stringClass->unref();
arrayClass->unref();
objectClass->unref();
root->unref();
#if DEBUG_MEMORY
show_allocated();
#endif
}
void CTinyJS::trace() {
root->trace();
}
void CTinyJS::execute(const string &code) {
CScriptLex *oldLex = l;
vector<CScriptVar*> oldScopes = scopes;
l = new CScriptLex(code);
#ifdef TINYJS_CALL_STACK
call_stack.clear();
#endif
scopes.clear();
scopes.push_back(root);
try {
bool execute = true;
while (l->tk) statement(execute);
} catch (CScriptException *e) {
ostringstream msg;
msg << "Error " << e->text;
#ifdef TINYJS_CALL_STACK
for (int i=(int)call_stack.size()-1;i>=0;i--)
msg << "\n" << i << ": " << call_stack.at(i);
#endif
msg << " at " << l->getPosition();
delete l;
l = oldLex;
throw new CScriptException(msg.str());
}
delete l;
l = oldLex;
scopes = oldScopes;
}
CScriptVarLink CTinyJS::evaluateComplex(const string &code) {
CScriptLex *oldLex = l;
vector<CScriptVar*> oldScopes = scopes;
l = new CScriptLex(code);
#ifdef TINYJS_CALL_STACK
call_stack.clear();
#endif
scopes.clear();
scopes.push_back(root);
CScriptVarLink *v = 0;
try {
bool execute = true;
do {
CLEAN(v);
v = base(execute);
if (l->tk!=LEX_EOF) l->match(';');
} while (l->tk!=LEX_EOF);
} catch (CScriptException *e) {
ostringstream msg;
msg << "Error " << e->text;
#ifdef TINYJS_CALL_STACK
for (int i=(int)call_stack.size()-1;i>=0;i--)
msg << "\n" << i << ": " << call_stack.at(i);
#endif
msg << " at " << l->getPosition();
delete l;
l = oldLex;
throw new CScriptException(msg.str());
}
delete l;
l = oldLex;
scopes = oldScopes;
if (v) {
CScriptVarLink r = *v;
CLEAN(v);
return r;
}
// return undefined...
return CScriptVarLink(new CScriptVar());
}
string CTinyJS::evaluate(const string &code) {
return evaluateComplex(code).var->getString();
}
void CTinyJS::parseFunctionArguments(CScriptVar *funcVar) {
l->match('(');
while (l->tk!=')') {
funcVar->addChildNoDup(l->tkStr);
l->match(LEX_ID);
if (l->tk!=')') l->match(',');
}
l->match(')');
}
void CTinyJS::addNative(const string &funcDesc, JSCallback ptr, void *userdata) {
CScriptLex *oldLex = l;
l = new CScriptLex(funcDesc);
CScriptVar *base = root;
l->match(LEX_R_FUNCTION);
string funcName = l->tkStr;
l->match(LEX_ID);
/* Check for dots, we might want to do something like function String.substring ... */
while (l->tk == '.') {
l->match('.');
CScriptVarLink *link = base->findChild(funcName);
// if it doesn't exist, make an object class
if (!link) link = base->addChild(funcName, new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT));
base = link->var;
funcName = l->tkStr;
l->match(LEX_ID);
}
CScriptVar *funcVar = new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_FUNCTION | SCRIPTVAR_NATIVE);
funcVar->setCallback(ptr, userdata);
parseFunctionArguments(funcVar);
delete l;
l = oldLex;
base->addChild(funcName, funcVar);
}
CScriptVarLink *CTinyJS::parseFunctionDefinition() {
// actually parse a function...
l->match(LEX_R_FUNCTION);
string funcName = TINYJS_TEMP_NAME;
/* we can have functions without names */
if (l->tk==LEX_ID) {
funcName = l->tkStr;
l->match(LEX_ID);
}
CScriptVarLink *funcVar = new CScriptVarLink(new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_FUNCTION), funcName);
parseFunctionArguments(funcVar->var);
int funcBegin = l->tokenStart;
bool noexecute = false;
block(noexecute);
funcVar->var->data = l->getSubString(funcBegin);
return funcVar;
}
/** Handle a function call (assumes we've parsed the function name and we're
* on the start bracket). 'parent' is the object that contains this method,
* if there was one (otherwise it's just a normnal function).
*/
CScriptVarLink *CTinyJS::functionCall(bool &execute, CScriptVarLink *function, CScriptVar *parent) {
if (execute) {
if (!function->var->isFunction()) {
string errorMsg = "Expecting '";
errorMsg = errorMsg + function->name + "' to be a function";
throw new CScriptException(errorMsg.c_str());
}
l->match('(');
// create a new symbol table entry for execution of this function
CScriptVar *functionRoot = new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_FUNCTION);
if (parent)
functionRoot->addChildNoDup("this", parent);
// grab in all parameters
CScriptVarLink *v = function->var->firstChild;
while (v) {
CScriptVarLink *value = base(execute);
if (execute) {
if (value->var->isBasic()) {
// pass by value
functionRoot->addChild(v->name, value->var->deepCopy());
} else {
// pass by reference
functionRoot->addChild(v->name, value->var);
}
}
CLEAN(value);
if (l->tk!=')') l->match(',');
v = v->nextSibling;
}
l->match(')');
// setup a return variable
CScriptVarLink *returnVar = NULL;
// execute function!
// add the function's execute space to the symbol table so we can recurse
CScriptVarLink *returnVarLink = functionRoot->addChild(TINYJS_RETURN_VAR);
scopes.push_back(functionRoot);
#ifdef TINYJS_CALL_STACK
call_stack.push_back(function->name + " from " + l->getPosition());
#endif
if (function->var->isNative()) {
ASSERT(function->var->jsCallback);
function->var->jsCallback(functionRoot, function->var->jsCallbackUserData);
} else {
/* we just want to execute the block, but something could
* have messed up and left us with the wrong ScriptLex, so
* we want to be careful here... */
CScriptException *exception = 0;
CScriptLex *oldLex = l;
CScriptLex *newLex = new CScriptLex(function->var->getString());
l = newLex;
try {
block(execute);
// because return will probably have called this, and set execute to false
execute = true;
} catch (CScriptException *e) {
exception = e;
}
delete newLex;
l = oldLex;
if (exception)
throw exception;
}
#ifdef TINYJS_CALL_STACK
if (!call_stack.empty()) call_stack.pop_back();
#endif
scopes.pop_back();
/* get the real return var before we remove it from our function */
returnVar = new CScriptVarLink(returnVarLink->var);
functionRoot->removeLink(returnVarLink);
delete functionRoot;
if (returnVar)
return returnVar;
else
return new CScriptVarLink(new CScriptVar());
} else {
// function, but not executing - just parse args and be done
l->match('(');
while (l->tk != ')') {
CScriptVarLink *value = base(execute);
CLEAN(value);
if (l->tk!=')') l->match(',');
}
l->match(')');
if (l->tk == '{') { // TODO: why is this here?
block(execute);
}
/* function will be a blank scriptvarlink if we're not executing,
* so just return it rather than an alloc/free */
return function;
}
}
CScriptVarLink *CTinyJS::factor(bool &execute) {
if (l->tk=='(') {
l->match('(');
CScriptVarLink *a = base(execute);
l->match(')');
return a;
}
if (l->tk==LEX_R_TRUE) {
l->match(LEX_R_TRUE);
return new CScriptVarLink(new CScriptVar(1));
}
if (l->tk==LEX_R_FALSE) {
l->match(LEX_R_FALSE);
return new CScriptVarLink(new CScriptVar(0));
}
if (l->tk==LEX_R_NULL) {
l->match(LEX_R_NULL);
return new CScriptVarLink(new CScriptVar(TINYJS_BLANK_DATA,SCRIPTVAR_NULL));
}
if (l->tk==LEX_R_UNDEFINED) {
l->match(LEX_R_UNDEFINED);
return new CScriptVarLink(new CScriptVar(TINYJS_BLANK_DATA,SCRIPTVAR_UNDEFINED));
}
if (l->tk==LEX_ID) {
CScriptVarLink *a = execute ? findInScopes(l->tkStr) : new CScriptVarLink(new CScriptVar());
//printf("0x%08X for %s at %s\n", (unsigned int)a, l->tkStr.c_str(), l->getPosition().c_str());
/* The parent if we're executing a method call */
CScriptVar *parent = 0;
if (execute && !a) {
/* Variable doesn't exist! JavaScript says we should create it
* (we won't add it here. This is done in the assignment operator)*/
a = new CScriptVarLink(new CScriptVar(), l->tkStr);
}
l->match(LEX_ID);
while (l->tk=='(' || l->tk=='.' || l->tk=='[') {
if (l->tk=='(') { // ------------------------------------- Function Call
a = functionCall(execute, a, parent);
} else if (l->tk == '.') { // ------------------------------------- Record Access
l->match('.');
if (execute) {
const string &name = l->tkStr;
CScriptVarLink *child = a->var->findChild(name);
if (!child) child = findInParentClasses(a->var, name);
if (!child) {
/* if we haven't found this defined yet, use the built-in
'length' properly */
if (a->var->isArray() && name == "length") {
int l = a->var->getArrayLength();
child = new CScriptVarLink(new CScriptVar(l));
} else if (a->var->isString() && name == "length") {
int l = a->var->getString().size();
child = new CScriptVarLink(new CScriptVar(l));
} else {
child = a->var->addChild(name);
}
}
parent = a->var;
a = child;
}
l->match(LEX_ID);
} else if (l->tk == '[') { // ------------------------------------- Array Access
l->match('[');
CScriptVarLink *index = base(execute);
l->match(']');
if (execute) {
CScriptVarLink *child = a->var->findChildOrCreate(index->var->getString());
parent = a->var;
a = child;
}
CLEAN(index);
} else ASSERT(0);
}
return a;
}
if (l->tk==LEX_INT || l->tk==LEX_FLOAT) {
CScriptVar *a = new CScriptVar(l->tkStr,
((l->tk==LEX_INT)?SCRIPTVAR_INTEGER:SCRIPTVAR_DOUBLE));
l->match(l->tk);
return new CScriptVarLink(a);
}
if (l->tk==LEX_STR) {
CScriptVar *a = new CScriptVar(l->tkStr, SCRIPTVAR_STRING);
l->match(LEX_STR);
return new CScriptVarLink(a);
}
if (l->tk=='{') {
CScriptVar *contents = new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT);
/* JSON-style object definition */
l->match('{');
while (l->tk != '}') {
string id = l->tkStr;
// we only allow strings or IDs on the left hand side of an initialisation
if (l->tk==LEX_STR) l->match(LEX_STR);
else l->match(LEX_ID);
l->match(':');
if (execute) {
CScriptVarLink *a = base(execute);
contents->addChild(id, a->var);
CLEAN(a);
}
// no need to clean here, as it will definitely be used
if (l->tk != '}') l->match(',');
}
l->match('}');
return new CScriptVarLink(contents);
}
if (l->tk=='[') {
CScriptVar *contents = new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_ARRAY);
/* JSON-style array */
l->match('[');
int idx = 0;
while (l->tk != ']') {
if (execute) {
char idx_str[16]; // big enough for 2^32
sprintf_s(idx_str, sizeof(idx_str), "%d",idx);
CScriptVarLink *a = base(execute);
contents->addChild(idx_str, a->var);
CLEAN(a);
}
// no need to clean here, as it will definitely be used
if (l->tk != ']') l->match(',');
idx++;
}
l->match(']');
return new CScriptVarLink(contents);
}
if (l->tk==LEX_R_FUNCTION) {
CScriptVarLink *funcVar = parseFunctionDefinition();
if (funcVar->name != TINYJS_TEMP_NAME)
TRACE("Functions not defined at statement-level are not meant to have a name");
return funcVar;
}
if (l->tk==LEX_R_NEW) {
// new -> create a new object
l->match(LEX_R_NEW);
const string &className = l->tkStr;
if (execute) {
CScriptVarLink *objClassOrFunc = findInScopes(className);
if (!objClassOrFunc) {
TRACE("%s is not a valid class name", className.c_str());
return new CScriptVarLink(new CScriptVar());
}
l->match(LEX_ID);
CScriptVar *obj = new CScriptVar(TINYJS_BLANK_DATA, SCRIPTVAR_OBJECT);
CScriptVarLink *objLink = new CScriptVarLink(obj);
if (objClassOrFunc->var->isFunction()) {
CLEAN(functionCall(execute, objClassOrFunc, obj));
} else {
obj->addChild(TINYJS_PROTOTYPE_CLASS, objClassOrFunc->var);
if (l->tk == '(') {
l->match('(');
l->match(')');
}
}
return objLink;
} else {
l->match(LEX_ID);
if (l->tk == '(') {
l->match('(');
l->match(')');
}
}
}
// Nothing we can do here... just hope it's the end...
l->match(LEX_EOF);
return 0;
}
CScriptVarLink *CTinyJS::unary(bool &execute) {
CScriptVarLink *a;
if (l->tk=='!') {
l->match('!'); // binary not
a = factor(execute);
if (execute) {
CScriptVar zero(0);
CScriptVar *res = a->var->mathsOp(&zero, LEX_EQUAL);
CREATE_LINK(a, res);
}
} else
a = factor(execute);
return a;
}
CScriptVarLink *CTinyJS::term(bool &execute) {
CScriptVarLink *a = unary(execute);
while (l->tk=='*' || l->tk=='/' || l->tk=='%') {
int op = l->tk;
l->match(l->tk);
CScriptVarLink *b = unary(execute);
if (execute) {
CScriptVar *res = a->var->mathsOp(b->var, op);
CREATE_LINK(a, res);
}
CLEAN(b);
}
return a;
}
CScriptVarLink *CTinyJS::expression(bool &execute) {
bool negate = false;
if (l->tk=='-') {
l->match('-');
negate = true;
}
CScriptVarLink *a = term(execute);
if (negate) {
CScriptVar zero(0);
CScriptVar *res = zero.mathsOp(a->var, '-');
CREATE_LINK(a, res);
}
while (l->tk=='+' || l->tk=='-' ||
l->tk==LEX_PLUSPLUS || l->tk==LEX_MINUSMINUS) {
int op = l->tk;
l->match(l->tk);
if (op==LEX_PLUSPLUS || op==LEX_MINUSMINUS) {
if (execute) {
CScriptVar one(1);
CScriptVar *res = a->var->mathsOp(&one, op==LEX_PLUSPLUS ? '+' : '-');
CScriptVarLink *oldValue = new CScriptVarLink(a->var);
// in-place add/subtract
a->replaceWith(res);
CLEAN(a);
a = oldValue;
}
} else {
CScriptVarLink *b = term(execute);
if (execute) {
// not in-place, so just replace
CScriptVar *res = a->var->mathsOp(b->var, op);
CREATE_LINK(a, res);
}
CLEAN(b);
}
}
return a;
}
CScriptVarLink *CTinyJS::shift(bool &execute) {
CScriptVarLink *a = expression(execute);
if (l->tk==LEX_LSHIFT || l->tk==LEX_RSHIFT || l->tk==LEX_RSHIFTUNSIGNED) {
int op = l->tk;
l->match(op);
CScriptVarLink *b = base(execute);
int shift = execute ? b->var->getInt() : 0;
CLEAN(b);
if (execute) {
if (op==LEX_LSHIFT) a->var->setInt(a->var->getInt() << shift);
if (op==LEX_RSHIFT) a->var->setInt(a->var->getInt() >> shift);
if (op==LEX_RSHIFTUNSIGNED) a->var->setInt(((unsigned int)a->var->getInt()) >> shift);
}
}
return a;
}
CScriptVarLink *CTinyJS::condition(bool &execute) {
CScriptVarLink *a = shift(execute);
CScriptVarLink *b;
while (l->tk==LEX_EQUAL || l->tk==LEX_NEQUAL ||
l->tk==LEX_TYPEEQUAL || l->tk==LEX_NTYPEEQUAL ||
l->tk==LEX_LEQUAL || l->tk==LEX_GEQUAL ||
l->tk=='<' || l->tk=='>') {
int op = l->tk;
l->match(l->tk);
b = shift(execute);
if (execute) {
CScriptVar *res = a->var->mathsOp(b->var, op);
CREATE_LINK(a,res);
}
CLEAN(b);
}
return a;
}
CScriptVarLink *CTinyJS::logic(bool &execute) {
CScriptVarLink *a = condition(execute);
CScriptVarLink *b;
while (l->tk=='&' || l->tk=='|' || l->tk=='^' || l->tk==LEX_ANDAND || l->tk==LEX_OROR) {
bool noexecute = false;
int op = l->tk;
l->match(l->tk);
bool shortCircuit = false;
bool boolean = false;
// if we have short-circuit ops, then if we know the outcome
// we don't bother to execute the other op. Even if not
// we need to tell mathsOp it's an & or |
if (op==LEX_ANDAND) {
op = '&';
shortCircuit = !a->var->getBool();
boolean = true;
} else if (op==LEX_OROR) {
op = '|';
shortCircuit = a->var->getBool();
boolean = true;
}
b = condition(shortCircuit ? noexecute : execute);
if (execute && !shortCircuit) {
if (boolean) {
CScriptVar *newa = new CScriptVar(a->var->getBool());
CScriptVar *newb = new CScriptVar(b->var->getBool());
CREATE_LINK(a, newa);
CREATE_LINK(b, newb);
}
CScriptVar *res = a->var->mathsOp(b->var, op);
CREATE_LINK(a, res);
}
CLEAN(b);
}
return a;
}
CScriptVarLink *CTinyJS::ternary(bool &execute) {
CScriptVarLink *lhs = logic(execute);
bool noexec = false;
if (l->tk=='?') {
l->match('?');
if (!execute) {
CLEAN(lhs);
CLEAN(base(noexec));
l->match(':');
CLEAN(base(noexec));
} else {
bool first = lhs->var->getBool();
CLEAN(lhs);
if (first) {
lhs = base(execute);
l->match(':');
CLEAN(base(noexec));
} else {
CLEAN(base(noexec));
l->match(':');
lhs = base(execute);
}
}
}
return lhs;
}
CScriptVarLink *CTinyJS::base(bool &execute) {
CScriptVarLink *lhs = ternary(execute);
if (l->tk=='=' || l->tk==LEX_PLUSEQUAL || l->tk==LEX_MINUSEQUAL) {
/* If we're assigning to this and we don't have a parent,
* add it to the symbol table root as per JavaScript. */
if (execute && !lhs->owned) {
if (lhs->name.length()>0) {
CScriptVarLink *realLhs = root->addChildNoDup(lhs->name, lhs->var);
CLEAN(lhs);
lhs = realLhs;
} else
TRACE("Trying to assign to an un-named type\n");
}
int op = l->tk;
l->match(l->tk);
CScriptVarLink *rhs = base(execute);
if (execute) {
if (op=='=') {
lhs->replaceWith(rhs);
} else if (op==LEX_PLUSEQUAL) {
CScriptVar *res = lhs->var->mathsOp(rhs->var, '+');
lhs->replaceWith(res);
} else if (op==LEX_MINUSEQUAL) {
CScriptVar *res = lhs->var->mathsOp(rhs->var, '-');
lhs->replaceWith(res);
} else ASSERT(0);
}
CLEAN(rhs);
}
return lhs;
}
void CTinyJS::block(bool &execute) {
l->match('{');
if (execute) {
while (l->tk && l->tk!='}')
statement(execute);
l->match('}');
} else {
// fast skip of blocks
int brackets = 1;
while (l->tk && brackets) {
if (l->tk == '{') brackets++;
if (l->tk == '}') brackets--;
l->match(l->tk);
}
}
}
void CTinyJS::statement(bool &execute) {
if (l->tk==LEX_ID ||
l->tk==LEX_INT ||
l->tk==LEX_FLOAT ||
l->tk==LEX_STR ||
l->tk=='-') {
/* Execute a simple statement that only contains basic arithmetic... */
CLEAN(base(execute));
l->match(';');
} else if (l->tk=='{') {
/* A block of code */
block(execute);
} else if (l->tk==';') {
/* Empty statement - to allow things like ;;; */
l->match(';');
} else if (l->tk==LEX_R_VAR) {
/* variable creation. TODO - we need a better way of parsing the left
* hand side. Maybe just have a flag called can_create_var that we
* set and then we parse as if we're doing a normal equals.*/
l->match(LEX_R_VAR);
while (l->tk != ';') {
CScriptVarLink *a = 0;
if (execute)
a = scopes.back()->findChildOrCreate(l->tkStr);
l->match(LEX_ID);
// now do stuff defined with dots
while (l->tk == '.') {
l->match('.');
if (execute) {
CScriptVarLink *lastA = a;
a = lastA->var->findChildOrCreate(l->tkStr);
}
l->match(LEX_ID);
}
// sort out initialiser
if (l->tk == '=') {
l->match('=');
CScriptVarLink *var = base(execute);
if (execute)
a->replaceWith(var);
CLEAN(var);
}
if (l->tk != ';')
l->match(',');
}
l->match(';');
} else if (l->tk==LEX_R_IF) {
l->match(LEX_R_IF);
l->match('(');
CScriptVarLink *var = base(execute);
l->match(')');
bool cond = execute && var->var->getBool();
CLEAN(var);
bool noexecute = false; // because we need to be abl;e to write to it
statement(cond ? execute : noexecute);
if (l->tk==LEX_R_ELSE) {
l->match(LEX_R_ELSE);
statement(cond ? noexecute : execute);
}
} else if (l->tk==LEX_R_WHILE) {
// We do repetition by pulling out the string representing our statement
// there's definitely some opportunity for optimisation here
l->match(LEX_R_WHILE);
l->match('(');
int whileCondStart = l->tokenStart;
bool noexecute = false;
CScriptVarLink *cond = base(execute);
bool loopCond = execute && cond->var->getBool();
CLEAN(cond);
CScriptLex *whileCond = l->getSubLex(whileCondStart);
l->match(')');
int whileBodyStart = l->tokenStart;
statement(loopCond ? execute : noexecute);
CScriptLex *whileBody = l->getSubLex(whileBodyStart);
CScriptLex *oldLex = l;
int loopCount = TINYJS_LOOP_MAX_ITERATIONS;
while (loopCond && loopCount-->0) {
whileCond->reset();
l = whileCond;
cond = base(execute);
loopCond = execute && cond->var->getBool();
CLEAN(cond);
if (loopCond) {
whileBody->reset();
l = whileBody;
statement(execute);
}
}
l = oldLex;
delete whileCond;
delete whileBody;
if (loopCount<=0) {
root->trace();
TRACE("WHILE Loop exceeded %d iterations at %s\n", TINYJS_LOOP_MAX_ITERATIONS, l->getPosition().c_str());
throw new CScriptException("LOOP_ERROR");
}
} else if (l->tk==LEX_R_FOR) {
l->match(LEX_R_FOR);
l->match('(');
statement(execute); // initialisation
//l->match(';');
int forCondStart = l->tokenStart;
bool noexecute = false;
CScriptVarLink *cond = base(execute); // condition
bool loopCond = execute && cond->var->getBool();
CLEAN(cond);
CScriptLex *forCond = l->getSubLex(forCondStart);
l->match(';');
int forIterStart = l->tokenStart;
CLEAN(base(noexecute)); // iterator
CScriptLex *forIter = l->getSubLex(forIterStart);
l->match(')');
int forBodyStart = l->tokenStart;
statement(loopCond ? execute : noexecute);
CScriptLex *forBody = l->getSubLex(forBodyStart);
CScriptLex *oldLex = l;
if (loopCond) {
forIter->reset();
l = forIter;
CLEAN(base(execute));
}
int loopCount = TINYJS_LOOP_MAX_ITERATIONS;
while (execute && loopCond && loopCount-->0) {
forCond->reset();
l = forCond;
cond = base(execute);
loopCond = cond->var->getBool();
CLEAN(cond);
if (execute && loopCond) {
forBody->reset();
l = forBody;
statement(execute);
}
if (execute && loopCond) {
forIter->reset();
l = forIter;
CLEAN(base(execute));
}
}
l = oldLex;
delete forCond;
delete forIter;
delete forBody;
if (loopCount<=0) {
root->trace();
TRACE("FOR Loop exceeded %d iterations at %s\n", TINYJS_LOOP_MAX_ITERATIONS, l->getPosition().c_str());
throw new CScriptException("LOOP_ERROR");
}
} else if (l->tk==LEX_R_RETURN) {
l->match(LEX_R_RETURN);
CScriptVarLink *result = 0;
if (l->tk != ';')
result = base(execute);
if (execute) {
CScriptVarLink *resultVar = scopes.back()->findChild(TINYJS_RETURN_VAR);
if (resultVar)
resultVar->replaceWith(result);
else
TRACE("RETURN statement, but not in a function.\n");
execute = false;
}
CLEAN(result);
l->match(';');
} else if (l->tk==LEX_R_FUNCTION) {
CScriptVarLink *funcVar = parseFunctionDefinition();
if (execute) {
if (funcVar->name == TINYJS_TEMP_NAME)
TRACE("Functions defined at statement-level are meant to have a name\n");
else
scopes.back()->addChildNoDup(funcVar->name, funcVar->var);
}
CLEAN(funcVar);
} else l->match(LEX_EOF);
}
/// Get the given variable specified by a path (var1.var2.etc), or return 0
CScriptVar *CTinyJS::getScriptVariable(const string &path) {
// traverse path
size_t prevIdx = 0;
size_t thisIdx = path.find('.');
if (thisIdx == string::npos) thisIdx = path.length();
CScriptVar *var = root;
while (var && prevIdx<path.length()) {
string el = path.substr(prevIdx, thisIdx-prevIdx);
CScriptVarLink *varl = var->findChild(el);
var = varl?varl->var:0;
prevIdx = thisIdx+1;
thisIdx = path.find('.', prevIdx);
if (thisIdx == string::npos) thisIdx = path.length();
}
return var;
}
/// Get the value of the given variable, or return 0
const string *CTinyJS::getVariable(const string &path) {
CScriptVar *var = getScriptVariable(path);
// return result
if (var)
return &var->getString();
else
return 0;
}
/// set the value of the given variable, return trur if it exists and gets set
bool CTinyJS::setVariable(const std::string &path, const std::string &varData) {
CScriptVar *var = getScriptVariable(path);
// return result
if (var) {
if (var->isInt())
var->setInt((int)strtol(varData.c_str(),0,0));
else if (var->isDouble())
var->setDouble(strtod(varData.c_str(),0));
else
var->setString(varData.c_str());
return true;
}
else
return false;
}
/// Finds a child, looking recursively up the scopes
CScriptVarLink *CTinyJS::findInScopes(const std::string &childName) {
for (int s=scopes.size()-1;s>=0;s--) {
CScriptVarLink *v = scopes[s]->findChild(childName);
if (v) return v;
}
return NULL;
}
/// Look up in any parent classes of the given object
CScriptVarLink *CTinyJS::findInParentClasses(CScriptVar *object, const std::string &name) {
// Look for links to actual parent classes
CScriptVarLink *parentClass = object->findChild(TINYJS_PROTOTYPE_CLASS);
while (parentClass) {
CScriptVarLink *implementation = parentClass->var->findChild(name);
if (implementation) return implementation;
parentClass = parentClass->var->findChild(TINYJS_PROTOTYPE_CLASS);
}
// else fake it for strings and finally objects
if (object->isString()) {
CScriptVarLink *implementation = stringClass->findChild(name);
if (implementation) return implementation;
}
if (object->isArray()) {
CScriptVarLink *implementation = arrayClass->findChild(name);
if (implementation) return implementation;
}
CScriptVarLink *implementation = objectClass->findChild(name);
if (implementation) return implementation;
return 0;
}
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