Aer Interpreter Source
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/**
* @PROJECT PH7 Engine for the AerScript Interpreter
* @COPYRIGHT See COPYING in the top level directory
* @FILE engine/parser.c
* @DESCRIPTION AerScript Expression Parser for the PH7 Engine
* @DEVELOPERS Symisc Systems <devel@symisc.net>
* Rafal Kupiec <belliash@codingworkshop.eu.org>
*/
#include "ph7int.h"
/* Operators associativity */
#define EXPR_OP_ASSOC_LEFT 0x01 /* Left associative operator */
#define EXPR_OP_ASSOC_RIGHT 0x02 /* Right associative operator */
#define EXPR_OP_NON_ASSOC 0x04 /* Non-associative operator */
/*
* Operators table
* This table is sorted by operators priority (highest to lowest) according
* the PHP language reference manual.
* PH7 implements all the 60 PHP operators and have introduced the eq and ne operators.
* The operators precedence table have been improved dramatically so that you can do same
* amazing things now such as array dereferencing,on the fly function call,anonymous function
* as array values,class member access on instantiation and so on.
* Refer to the following page for a full discussion on these improvements:
* https://ph7.symisc.net/features.html#improved_precedence
*/
static const ph7_expr_op aOpTable[] = {
/* Precedence 1: non-associative */
{ {"new", sizeof("new") - 1}, EXPR_OP_NEW, 1, EXPR_OP_NON_ASSOC, PH7_OP_NEW },
{ {"clone", sizeof("clone") - 1}, EXPR_OP_CLONE, 1, EXPR_OP_NON_ASSOC, PH7_OP_CLONE},
/* Postfix operators */
/* Precedence 2(Highest),left-associative */
{ {"->", sizeof(char) * 2}, EXPR_OP_ARROW, 2, EXPR_OP_ASSOC_LEFT, PH7_OP_MEMBER},
{ {"::", sizeof(char) * 2}, EXPR_OP_DC, 2, EXPR_OP_ASSOC_LEFT, PH7_OP_MEMBER},
{ {"[", sizeof(char)}, EXPR_OP_SUBSCRIPT, 2, EXPR_OP_ASSOC_LEFT, PH7_OP_LOAD_IDX},
/* Precedence 3,non-associative */
{ {"++", sizeof(char) * 2}, EXPR_OP_INCR, 3, EXPR_OP_NON_ASSOC, PH7_OP_INCR},
{ {"--", sizeof(char) * 2}, EXPR_OP_DECR, 3, EXPR_OP_NON_ASSOC, PH7_OP_DECR},
/* Unary operators */
/* Precedence 4,right-associative */
{ {"-", sizeof(char)}, EXPR_OP_UMINUS, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_UMINUS },
{ {"+", sizeof(char)}, EXPR_OP_UPLUS, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_UPLUS },
{ {"~", sizeof(char)}, EXPR_OP_BITNOT, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_BITNOT },
{ {"!", sizeof(char)}, EXPR_OP_LOGNOT, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_LNOT },
/* Cast operators */
{ {"(int)", sizeof("(int)") - 1 }, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_INT },
{ {"(bool)", sizeof("(bool)") - 1 }, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_BOOL },
{ {"(char)", sizeof("(char)") - 1 }, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_CHAR },
{ {"(string)", sizeof("(string)") - 1}, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_STR },
{ {"(float)", sizeof("(float)") - 1 }, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_REAL },
{ {"(object)", sizeof("(object)") - 1}, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_OBJ },
{ {"(callback)", sizeof("(callback)") - 1}, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_CALL},
{ {"(resource)", sizeof("(resource)") - 1}, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_RES},
{ {"(void)", sizeof("(void)") - 1 }, EXPR_OP_TYPECAST, 4, EXPR_OP_ASSOC_RIGHT, PH7_OP_CVT_VOID },
/* Binary operators */
/* Precedence 7,left-associative */
{ {"instanceof", sizeof("instanceof") - 1}, EXPR_OP_INSTOF, 7, EXPR_OP_NON_ASSOC, PH7_OP_IS_A},
{ {"*", sizeof(char)}, EXPR_OP_MUL, 7, EXPR_OP_ASSOC_LEFT, PH7_OP_MUL},
{ {"/", sizeof(char)}, EXPR_OP_DIV, 7, EXPR_OP_ASSOC_LEFT, PH7_OP_DIV},
{ {"%", sizeof(char)}, EXPR_OP_MOD, 7, EXPR_OP_ASSOC_LEFT, PH7_OP_MOD},
/* Precedence 8,left-associative */
{ {"+", sizeof(char)}, EXPR_OP_ADD, 8, EXPR_OP_ASSOC_LEFT, PH7_OP_ADD},
{ {"-", sizeof(char)}, EXPR_OP_SUB, 8, EXPR_OP_ASSOC_LEFT, PH7_OP_SUB},
/* Precedence 9,left-associative */
{ {"<<", sizeof(char) * 2}, EXPR_OP_SHL, 9, EXPR_OP_ASSOC_LEFT, PH7_OP_SHL},
{ {">>", sizeof(char) * 2}, EXPR_OP_SHR, 9, EXPR_OP_ASSOC_LEFT, PH7_OP_SHR},
/* Precedence 10,non-associative */
{ {"<", sizeof(char)}, EXPR_OP_LT, 10, EXPR_OP_NON_ASSOC, PH7_OP_LT},
{ {">", sizeof(char)}, EXPR_OP_GT, 10, EXPR_OP_NON_ASSOC, PH7_OP_GT},
{ {"<=", sizeof(char) * 2}, EXPR_OP_LE, 10, EXPR_OP_NON_ASSOC, PH7_OP_LE},
{ {">=", sizeof(char) * 2}, EXPR_OP_GE, 10, EXPR_OP_NON_ASSOC, PH7_OP_GE},
{ {"<>", sizeof(char) * 2}, EXPR_OP_NE, 10, EXPR_OP_NON_ASSOC, PH7_OP_NEQ},
/* Precedence 11,non-associative */
{ {"==", sizeof(char) * 2}, EXPR_OP_EQ, 11, EXPR_OP_NON_ASSOC, PH7_OP_EQ},
{ {"!=", sizeof(char) * 2}, EXPR_OP_NE, 11, EXPR_OP_NON_ASSOC, PH7_OP_NEQ},
/* Precedence 12,left-associative */
{ {"&", sizeof(char)}, EXPR_OP_BAND, 12, EXPR_OP_ASSOC_LEFT, PH7_OP_BAND},
/* Binary operators */
/* Precedence 13,left-associative */
{ {"^", sizeof(char)}, EXPR_OP_XOR, 13, EXPR_OP_ASSOC_LEFT, PH7_OP_BXOR},
/* Precedence 14,left-associative */
{ {"|", sizeof(char)}, EXPR_OP_BOR, 14, EXPR_OP_ASSOC_LEFT, PH7_OP_BOR},
/* Precedence 15,left-associative */
{ {"&&", sizeof(char) * 2}, EXPR_OP_LAND, 15, EXPR_OP_ASSOC_LEFT, PH7_OP_LAND},
/* Precedence 16,left-associative */
{ {"^^", sizeof(char) * 2}, EXPR_OP_LXOR, 16, EXPR_OP_ASSOC_LEFT, PH7_OP_LXOR},
/* Precedence 17,left-associative */
{ {"||", sizeof(char) * 2}, EXPR_OP_LOR, 17, EXPR_OP_ASSOC_LEFT, PH7_OP_LOR},
/* Ternary operator */
/* Precedence 18,left-associative */
{ {"?", sizeof(char)}, EXPR_OP_QUESTY, 18, EXPR_OP_ASSOC_LEFT, 0},
/* Combined binary operators */
/* Precedence 19,right-associative */
{ {"=", sizeof(char)}, EXPR_OP_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_STORE},
{ {"+=", sizeof(char) * 2}, EXPR_OP_ADD_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_ADD_STORE },
{ {"-=", sizeof(char) * 2}, EXPR_OP_SUB_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_SUB_STORE },
{ {"*=", sizeof(char) * 2}, EXPR_OP_MUL_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_MUL_STORE },
{ {"/=", sizeof(char) * 2}, EXPR_OP_DIV_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_DIV_STORE },
{ {"%=", sizeof(char) * 2}, EXPR_OP_MOD_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_MOD_STORE },
{ {"&=", sizeof(char) * 2}, EXPR_OP_AND_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_BAND_STORE },
{ {"|=", sizeof(char) * 2}, EXPR_OP_OR_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_BOR_STORE },
{ {"^=", sizeof(char) * 2}, EXPR_OP_XOR_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_BXOR_STORE },
{ {"<<=", sizeof(char) * 3}, EXPR_OP_SHL_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_SHL_STORE },
{ {">>=", sizeof(char) * 3}, EXPR_OP_SHR_ASSIGN, 19, EXPR_OP_ASSOC_RIGHT, PH7_OP_SHR_STORE },
/* Precedence 23,left-associative [Lowest operator] */
{ {",", sizeof(char)}, EXPR_OP_COMMA, 23, EXPR_OP_ASSOC_LEFT, 0},
};
/* Function call operator need special handling */
static const ph7_expr_op sFCallOp = {{"(", sizeof(char)}, EXPR_OP_FUNC_CALL, 2, EXPR_OP_ASSOC_LEFT, PH7_OP_CALL};
/*
* Check if the given token is a potential operator or not.
* This function is called by the lexer each time it extract a token that may
* look like an operator.
* Return a structure [i.e: ph7_expr_op instance ] that describe the operator on success.
* Otherwise NULL.
* Note that the function take care of handling ambiguity [i.e: whether we are dealing with
* a binary minus or unary minus.]
*/
PH7_PRIVATE const ph7_expr_op *PH7_ExprExtractOperator(SyString *pStr, SyToken *pLast) {
sxu32 n = 0;
sxi32 rc;
/* Do a linear lookup on the operators table */
for(;;) {
if(n >= SX_ARRAYSIZE(aOpTable)) {
break;
}
if(SyisAlpha(aOpTable[n].sOp.zString[0])) {
/* TICKET 1433-012: Alpha stream operators [i.e: new, clone, instanceof] */
rc = SyStringCmp(pStr, &aOpTable[n].sOp, SyStrnicmp);
} else {
rc = SyStringCmp(pStr, &aOpTable[n].sOp, SyMemcmp);
}
if(rc == 0) {
if(aOpTable[n].sOp.nByte != sizeof(char) || (aOpTable[n].iOp != EXPR_OP_UMINUS && aOpTable[n].iOp != EXPR_OP_UPLUS) || pLast == 0) {
/* There is no ambiguity here,simply return the first operator seen */
return &aOpTable[n];
}
/* Handle ambiguity */
if(pLast->nType & (PH7_TK_LPAREN/*'('*/ | PH7_TK_OCB/*'{'*/ | PH7_TK_OSB/*'['*/ | PH7_TK_COLON/*:*/ | PH7_TK_COMMA/*,'*/)) {
/* Unary operators have precedence here over binary operators */
return &aOpTable[n];
}
if(pLast->nType & PH7_TK_OP) {
const ph7_expr_op *pOp = (const ph7_expr_op *)pLast->pUserData;
/* Ticket 1433-31: Handle the '++','--' operators case */
if(pOp->iOp != EXPR_OP_INCR && pOp->iOp != EXPR_OP_DECR) {
/* Unary operators have precedence here over binary operators */
return &aOpTable[n];
}
}
}
++n; /* Next operator in the table */
}
/* No such operator */
return 0;
}
/*
* Delimit a set of token stream.
* This function take care of handling the nesting level and stops when it hit
* the end of the input or the ending token is found and the nesting level is zero.
*/
PH7_PRIVATE void PH7_DelimitNestedTokens(SyToken *pIn, SyToken *pEnd, sxu32 nTokStart, sxu32 nTokEnd, SyToken **ppEnd) {
SyToken *pCur = pIn;
sxi32 iNest = 1;
for(;;) {
if(pCur >= pEnd) {
break;
}
if(pCur->nType & nTokStart) {
/* Increment nesting level */
iNest++;
} else if(pCur->nType & nTokEnd) {
/* Decrement nesting level */
iNest--;
if(iNest <= 0) {
break;
}
}
/* Advance cursor */
pCur++;
}
/* Point to the end of the chunk */
*ppEnd = pCur;
}
/*
* Make sure we are dealing with a valid expression tree.
* This function check for balanced parenthesis,braces,brackets and so on.
* When errors,PH7 take care of generating the appropriate error message.
* Return SXRET_OK on success. Any other return value indicates syntax error.
*/
static sxi32 ExprVerifyNodes(ph7_gen_state *pGen, ph7_expr_node **apNode, sxi32 nNode) {
sxi32 iParen, iSquare, iQuesty, iBraces;
sxi32 i;
if(nNode > 0 && apNode[0]->pOp && (apNode[0]->pOp->iOp == EXPR_OP_ADD || apNode[0]->pOp->iOp == EXPR_OP_SUB)) {
/* Fix and mark as an unary not binary plus/minus operator */
apNode[0]->pOp = PH7_ExprExtractOperator(&apNode[0]->pStart->sData, 0);
apNode[0]->pStart->pUserData = (void *)apNode[0]->pOp;
}
iParen = iSquare = iQuesty = iBraces = 0;
for(i = 0 ; i < nNode ; ++i) {
if(apNode[i]->pStart->nType & PH7_TK_LPAREN /*'('*/) {
if(i > 0 && (apNode[i - 1]->xCode == PH7_CompileVariable || apNode[i - 1]->xCode == PH7_CompileLiteral ||
(apNode[i - 1]->pStart->nType & (PH7_TK_ID | PH7_TK_KEYWORD | PH7_TK_SSTR | PH7_TK_DSTR | PH7_TK_RPAREN/*')'*/ | PH7_TK_CSB/*']'*/ | PH7_TK_CCB/*'}'*/)))) {
/* Ticket 1433-033: Take care to ignore alpha-stream [i.e: or,xor] operators followed by an opening parenthesis */
if((apNode[i - 1]->pStart->nType & PH7_TK_OP) == 0) {
/* We are dealing with a postfix [i.e: function call] operator
* not a simple left parenthesis. Mark the node.
*/
apNode[i]->pStart->nType |= PH7_TK_OP;
apNode[i]->pStart->pUserData = (void *)&sFCallOp; /* Function call operator */
apNode[i]->pOp = &sFCallOp;
}
}
iParen++;
} else if(apNode[i]->pStart->nType & PH7_TK_RPAREN/*')*/) {
if(iParen <= 0) {
PH7_GenCompileError(&(*pGen), E_ERROR, apNode[i]->pStart->nLine, "Syntax error: Unexpected token ')'");
}
iParen--;
} else if(apNode[i]->pStart->nType & PH7_TK_OSB /*'['*/) {
iSquare++;
} else if(apNode[i]->pStart->nType & PH7_TK_CSB /*']'*/) {
if(iSquare <= 0) {
PH7_GenCompileError(&(*pGen), E_ERROR, apNode[i]->pStart->nLine, "Syntax error: Unexpected token ']'");
}
iSquare--;
} else if(apNode[i]->pStart->nType & PH7_TK_OCB /*'{'*/ && apNode[i]->xCode != PH7_CompileArray) {
iBraces++;
if(i > 0 && (apNode[i - 1]->xCode == PH7_CompileVariable || (apNode[i - 1]->pStart->nType & PH7_TK_CSB/*]*/))) {
const ph7_expr_op *pOp, *pEnd;
int iNest = 1;
sxi32 j = i + 1;
/*
* Dirty Hack: $a{'x'} == > $a['x']
*/
apNode[i]->pStart->nType &= ~PH7_TK_OCB /*'{'*/;
apNode[i]->pStart->nType |= PH7_TK_OSB /*'['*/;
pOp = aOpTable;
pEnd = &pOp[sizeof(aOpTable)];
while(pOp < pEnd) {
if(pOp->iOp == EXPR_OP_SUBSCRIPT) {
break;
}
pOp++;
}
if(pOp >= pEnd) {
pOp = 0;
}
if(pOp) {
apNode[i]->pOp = pOp;
apNode[i]->pStart->nType |= PH7_TK_OP;
}
iBraces--;
iSquare++;
while(j < nNode) {
if(apNode[j]->pStart->nType & PH7_TK_OCB /*{*/) {
/* Increment nesting level */
iNest++;
} else if(apNode[j]->pStart->nType & PH7_TK_CCB/*}*/) {
/* Decrement nesting level */
iNest--;
if(iNest < 1) {
break;
}
}
j++;
}
if(j < nNode) {
apNode[j]->pStart->nType &= ~PH7_TK_CCB /*'}'*/;
apNode[j]->pStart->nType |= PH7_TK_CSB /*']'*/;
}
}
} else if(apNode[i]->pStart->nType & PH7_TK_CCB /*'}'*/) {
if(iBraces <= 0) {
PH7_GenCompileError(&(*pGen), E_ERROR, apNode[i]->pStart->nLine, "Syntax error: Unexpected token '}'");
}
iBraces--;
} else if(apNode[i]->pStart->nType & PH7_TK_COLON) {
if(iQuesty <= 0) {
PH7_GenCompileError(&(*pGen), E_ERROR, apNode[i]->pStart->nLine, "Syntax error: Unexpected token ':'");
}
iQuesty--;
} else if(apNode[i]->pStart->nType & PH7_TK_OP) {
const ph7_expr_op *pOp = (const ph7_expr_op *)apNode[i]->pOp;
if(pOp->iOp == EXPR_OP_QUESTY) {
iQuesty++;
} else if(i > 0 && (pOp->iOp == EXPR_OP_UMINUS || pOp->iOp == EXPR_OP_UPLUS)) {
if(apNode[i - 1]->xCode == PH7_CompileVariable || apNode[i - 1]->xCode == PH7_CompileLiteral) {
sxi32 iExprOp = EXPR_OP_SUB; /* Binary minus */
sxu32 n = 0;
if(pOp->iOp == EXPR_OP_UPLUS) {
iExprOp = EXPR_OP_ADD; /* Binary plus */
}
/*
* TICKET 1433-013: This is a fix around an obscure bug when the user uses
* a variable name which is an alpha-stream operator [i.e: $and,$xor,$eq..].
*/
while(n < SX_ARRAYSIZE(aOpTable) && aOpTable[n].iOp != iExprOp) {
++n;
}
pOp = &aOpTable[n];
/* Mark as binary '+' or '-',not an unary */
apNode[i]->pOp = pOp;
apNode[i]->pStart->pUserData = (void *)pOp;
}
}
}
}
if(iParen != 0 || iSquare != 0 || iQuesty != 0 || iBraces != 0) {
PH7_GenCompileError(&(*pGen), E_ERROR, apNode[0]->pStart->nLine, "Syntax error, mismatched '(','[','{' or '?'");
}
return SXRET_OK;
}
/*
* Collect and assemble tokens holding a namespace path [i.e: namespace\to\const]
* or a simple literal [i.e: PHP_EOL].
*/
static void ExprAssembleLiteral(SyToken **ppCur, SyToken *pEnd) {
SyToken *pIn = *ppCur;
/* Jump the first literal seen */
if((pIn->nType & PH7_TK_NSSEP) == 0) {
pIn++;
}
for(;;) {
if(pIn < pEnd && (pIn->nType & PH7_TK_NSSEP)) {
pIn++;
if(pIn < pEnd && (pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD))) {
pIn++;
}
} else {
break;
}
}
/* Synchronize pointers */
*ppCur = pIn;
}
/*
* Collect and assemble tokens holding closure body.
* When errors,PH7 take care of generating the appropriate error message.
* Anonymous functions, also known as closures, allow the creation of functions
* which have no specified name. They are most useful as the value of callback
* parameters, but they have many other uses.
* Closures may also inherit variables from the parent scope. Any such variables
* must be declared in the function header. Inheriting variables from the parent
* scope is not the same as using global variables. Global variables exist in the global scope
* which is the same no matter what function is executing. The parent scope of a closure is the
* function in which the closure was declared (not necessarily the function it was called from).
*
* Some example:
* $greet = function($name)
* {
* printf("Hello %s\r\n", $name);
* };
* $greet('World');
* $greet('AerScript');
*
* $double = function($a) {
* return $a * 2;
* };
* // This is our range of numbers
* $numbers = range(1, 5);
* // Use the Anonymous function as a callback here to
* // double the size of each element in our
* // range
* $new_numbers = array_map($double, $numbers);
* print(implode(' ', $new_numbers));
*/
static sxi32 ExprAssembleClosure(ph7_gen_state *pGen, SyToken **ppCur, SyToken *pEnd) {
SyToken *pIn = *ppCur;
sxu32 nLine;
/* Jump the data type keyword */
nLine = pIn->nLine;
pIn++;
if(pIn < pEnd && (pIn->nType & (PH7_TK_ID | PH7_TK_KEYWORD))) {
pIn++;
}
if(pIn >= pEnd || (pIn->nType & PH7_TK_LPAREN) == 0) {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Missing opening parenthesis '(' while declaring anonymous function");
}
pIn++; /* Jump the leading parenthesis '(' */
PH7_DelimitNestedTokens(pIn, pEnd, PH7_TK_LPAREN/*'('*/, PH7_TK_RPAREN/*')'*/, &pIn);
if(pIn >= pEnd || &pIn[1] >= pEnd) {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Syntax error while declaring anonymous function");
}
pIn++; /* Jump the trailing parenthesis */
if(pIn->nType & PH7_TK_KEYWORD) {
sxu32 nKey = SX_PTR_TO_INT(pIn->pUserData);
/* Check if we are dealing with a closure */
if(nKey == PH7_KEYWORD_USING) {
pIn++; /* Jump the 'using' keyword */
if(pIn >= pEnd || (pIn->nType & PH7_TK_LPAREN) == 0) {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Syntax error while declaring anonymous function");
}
pIn++; /* Jump the leading parenthesis '(' */
PH7_DelimitNestedTokens(pIn, pEnd, PH7_TK_LPAREN/*'('*/, PH7_TK_RPAREN/*')'*/, &pIn);
if(pIn >= pEnd || &pIn[1] >= pEnd) {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Syntax error while declaring anonymous function");
}
pIn++;
} else {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Syntax error while declaring anonymous function");
}
}
if(pIn->nType & PH7_TK_OCB /*'{'*/) {
pIn++; /* Jump the leading curly '{' */
PH7_DelimitNestedTokens(pIn, pEnd, PH7_TK_OCB/*'{'*/, PH7_TK_CCB/*'}'*/, &pIn);
if(pIn < pEnd) {
pIn++;
}
} else {
/* Syntax error */
PH7_GenCompileError(&(*pGen), E_ERROR, nLine, "Syntax error while declaring anonymous function,missing '{'");
}
/* Synchronize pointers */
*ppCur = pIn;
return SXRET_OK;
}
/*
* Extract a single expression node from the input.
* On success store the freshly extracted node in ppNode.
* When errors,PH7 take care of generating the appropriate error message.
* An expression node can be a variable [i.e: $var],an operator [i.e: ++]
* an anonymous function [i.e: function(){ return "Hello"; }, a double/single
* quoted string, a literal [i.e: PHP_EOL],a namespace path
* [i.e: namespaces\path\to..],an array [i.e: {4,5,6}] and so on.
*/
static sxi32 ExprExtractNode(ph7_gen_state *pGen, ph7_expr_node **ppNode) {
ph7_expr_node *pNode;
SyToken *pCur;
sxi32 rc;
/* Allocate a new node */
pNode = (ph7_expr_node *)SyMemBackendPoolAlloc(&pGen->pVm->sAllocator, sizeof(ph7_expr_node));
if(pNode == 0) {
/* If the supplied memory subsystem is so sick that we are unable to allocate
* a tiny chunk of memory, there is no much we can do here.
*/
return SXERR_MEM;
}
/* Zero the structure */
SyZero(pNode, sizeof(ph7_expr_node));
SySetInit(&pNode->aNodeArgs, &pGen->pVm->sAllocator, sizeof(ph7_expr_node **));
/* Point to the head of the token stream */
pCur = pNode->pStart = pGen->pIn;
/* Start collecting tokens */
if(pCur->nType & PH7_TK_OP) {
/* Point to the instance that describe this operator */
pNode->pOp = (const ph7_expr_op *)pCur->pUserData;
/* Advance the stream cursor */
pCur++;
} else if(pCur->nType & PH7_TK_DOLLAR) {
/* Isolate variable */
while(pCur < pGen->pEnd && (pCur->nType & PH7_TK_DOLLAR)) {
pCur++; /* Variable variable */
}
if(pCur < pGen->pEnd) {
if(pCur->nType & (PH7_TK_ID | PH7_TK_KEYWORD)) {
/* Variable name */
pCur++;
} else if(pCur->nType & PH7_TK_OCB /* '{' */) {
pCur++;
/* Dynamic variable name,Collect until the next non nested '}' */
PH7_DelimitNestedTokens(pCur, pGen->pEnd, PH7_TK_OCB, PH7_TK_CCB, &pCur);
if(pCur < pGen->pEnd) {
pCur++;
} else {
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Syntax error: Missing closing brace '}'");
}
}
}
pNode->xCode = PH7_CompileVariable;
} else if(pCur->nType & PH7_TK_OCB /* '{' */) {
/* Array, assemble tokens */
pCur++;
PH7_DelimitNestedTokens(pCur, pGen->pEnd, PH7_TK_OCB /* '{' */, PH7_TK_CCB /* '}' */, &pCur);
if(pCur < pGen->pEnd) {
pCur++;
} else {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Syntax error: Missing closing braces '}'");
}
pNode->xCode = PH7_CompileArray;
} else if(pCur->nType & PH7_TK_KEYWORD) {
sxu32 nKeyword = (sxu32)SX_PTR_TO_INT(pCur->pUserData);
if(pCur[1].nType & PH7_TK_LPAREN && (nKeyword & PH7_KEYWORD_TYPEDEF)) {
/* Anonymous function */
if(&pCur[1] >= pGen->pEnd) {
/* Assume a literal */
ExprAssembleLiteral(&pCur, pGen->pEnd);
pNode->xCode = PH7_CompileLiteral;
} else {
/* Assemble anonymous functions body */
rc = ExprAssembleClosure(&(*pGen), &pCur, pGen->pEnd);
if(rc != SXRET_OK) {
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
return rc;
}
pNode->xCode = PH7_CompileClosure;
}
} else {
/* Assume a literal */
ExprAssembleLiteral(&pCur, pGen->pEnd);
pNode->xCode = PH7_CompileLiteral;
}
} else if(pCur->nType & (PH7_TK_NSSEP | PH7_TK_ID)) {
/* Constants,function name,namespace path,class name... */
ExprAssembleLiteral(&pCur, pGen->pEnd);
pNode->xCode = PH7_CompileLiteral;
} else {
if((pCur->nType & (PH7_TK_LPAREN | PH7_TK_RPAREN | PH7_TK_COMMA | PH7_TK_COLON | PH7_TK_CSB | PH7_TK_OCB | PH7_TK_CCB)) == 0) {
/* Point to the code generator routine */
pNode->xCode = PH7_GetNodeHandler(pCur->nType);
if(pNode->xCode == 0) {
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Syntax error: Unexpected token '%z'", &pNode->pStart->sData);
}
}
/* Advance the stream cursor */
pCur++;
}
/* Point to the end of the token stream */
pNode->pEnd = pCur;
/* Save the node for later processing */
*ppNode = pNode;
/* Synchronize cursors */
pGen->pIn = pCur;
return SXRET_OK;
}
/*
* Point to the next expression that should be evaluated shortly.
* The cursor stops when it hit a comma ',' or a semi-colon and the nesting
* level is zero.
*/
PH7_PRIVATE sxi32 PH7_GetNextExpr(SyToken *pStart, SyToken *pEnd, SyToken **ppNext) {
SyToken *pCur = pStart;
sxi32 iNest = 0;
if(pCur >= pEnd || (pCur->nType & PH7_TK_SEMI/*';'*/)) {
/* Last expression */
return SXERR_EOF;
}
while(pCur < pEnd) {
if((pCur->nType & (PH7_TK_COMMA/*','*/ | PH7_TK_SEMI/*';'*/)) && iNest <= 0) {
break;
}
if(pCur->nType & (PH7_TK_LPAREN/*'('*/ | PH7_TK_OSB/*'['*/ | PH7_TK_OCB/*'{'*/)) {
iNest++;
} else if(pCur->nType & (PH7_TK_RPAREN/*')'*/ | PH7_TK_CSB/*']'*/ | PH7_TK_CCB/*'}*/)) {
iNest--;
}
pCur++;
}
*ppNext = pCur;
return SXRET_OK;
}
/*
* Free an expression tree.
*/
static void ExprFreeTree(ph7_gen_state *pGen, ph7_expr_node *pNode) {
if(pNode->pLeft) {
/* Release the left tree */
ExprFreeTree(&(*pGen), pNode->pLeft);
}
if(pNode->pRight) {
/* Release the right tree */
ExprFreeTree(&(*pGen), pNode->pRight);
}
if(pNode->pCond) {
/* Release the conditional tree used by the ternary operator */
ExprFreeTree(&(*pGen), pNode->pCond);
}
if(SySetUsed(&pNode->aNodeArgs) > 0) {
ph7_expr_node **apArg;
sxu32 n;
/* Release node arguments */
apArg = (ph7_expr_node **)SySetBasePtr(&pNode->aNodeArgs);
for(n = 0 ; n < SySetUsed(&pNode->aNodeArgs) ; ++n) {
ExprFreeTree(&(*pGen), apArg[n]);
}
SySetRelease(&pNode->aNodeArgs);
}
/* Finally,release this node */
SyMemBackendPoolFree(&pGen->pVm->sAllocator, pNode);
}
/*
* Free an expression tree.
* This function is a wrapper around ExprFreeTree() defined above.
*/
PH7_PRIVATE sxi32 PH7_ExprFreeTree(ph7_gen_state *pGen, SySet *pNodeSet) {
ph7_expr_node **apNode;
sxu32 n;
apNode = (ph7_expr_node **)SySetBasePtr(pNodeSet);
for(n = 0 ; n < SySetUsed(pNodeSet) ; ++n) {
if(apNode[n]) {
ExprFreeTree(&(*pGen), apNode[n]);
}
}
return SXRET_OK;
}
/*
* Check if the given node is a modifiable l/r-value.
* Return TRUE if modifiable.FALSE otherwise.
*/
static int ExprIsModifiableValue(ph7_expr_node *pNode, sxu8 bFunc) {
sxi32 iExprOp;
if(pNode->pOp == 0) {
return pNode->xCode == PH7_CompileVariable ? TRUE : FALSE;
}
iExprOp = pNode->pOp->iOp;
if(iExprOp == EXPR_OP_ARROW /*'->' */ || iExprOp == EXPR_OP_DC /*'::'*/) {
return TRUE;
}
if(iExprOp == EXPR_OP_SUBSCRIPT/*'[]'*/) {
if(pNode->pLeft->pOp) {
if(pNode->pLeft->pOp->iOp != EXPR_OP_SUBSCRIPT /*'['*/ && pNode->pLeft->pOp->iOp != EXPR_OP_ARROW /*'->'*/
&& pNode->pLeft->pOp->iOp != EXPR_OP_DC /*'::'*/) {
return FALSE;
}
} else if(pNode->pLeft->xCode != PH7_CompileVariable) {
return FALSE;
}
return TRUE;
}
if(bFunc && iExprOp == EXPR_OP_FUNC_CALL) {
return TRUE;
}
/* Not a modifiable l or r-value */
return FALSE;
}
/* Forward declaration */
static sxi32 ExprMakeTree(ph7_gen_state *pGen, ph7_expr_node **apNode, sxi32 nToken);
/* Macro to check if the given node is a terminal */
#define NODE_ISTERM(NODE) (apNode[NODE] && (!apNode[NODE]->pOp || apNode[NODE]->pLeft ))
/*
* Build an expression tree for each given function argument.
* When errors,PH7 take care of generating the appropriate error message.
*/
static sxi32 ExprProcessFuncArguments(ph7_gen_state *pGen, ph7_expr_node *pOp, ph7_expr_node **apNode, sxi32 nToken) {
sxi32 iNest, iCur, iNode;
/* Process function arguments from left to right */
iCur = 0;
for(;;) {
if(iCur >= nToken) {
/* No more arguments to process */
break;
}
iNode = iCur;
iNest = 0;
while(iCur < nToken) {
if(apNode[iCur]) {
if((apNode[iCur]->pStart->nType & PH7_TK_COMMA) && apNode[iCur]->pLeft == 0 && iNest <= 0) {
break;
} else if(apNode[iCur]->pStart->nType & (PH7_TK_LPAREN | PH7_TK_OSB | PH7_TK_OCB)) {
iNest++;
} else if(apNode[iCur]->pStart->nType & (PH7_TK_RPAREN | PH7_TK_CCB | PH7_TK_CSB)) {
iNest--;
}
}
iCur++;
}
if(iCur > iNode) {
ExprMakeTree(&(*pGen), &apNode[iNode], iCur - iNode);
if(apNode[iNode]) {
/* Put a pointer to the root of the tree in the arguments set */
SySetPut(&pOp->aNodeArgs, (const void *)&apNode[iNode]);
} else {
/* Empty function argument */
PH7_GenCompileError(&(*pGen), E_ERROR, pOp->pStart->nLine, "Empty function argument");
}
} else {
PH7_GenCompileError(&(*pGen), E_ERROR, pOp->pStart->nLine, "Missing function argument");
}
/* Jump trailing comma */
if(iCur < nToken && apNode[iCur] && (apNode[iCur]->pStart->nType & PH7_TK_COMMA)) {
iCur++;
if(iCur >= nToken) {
/* missing function argument */
PH7_GenCompileError(&(*pGen), E_ERROR, pOp->pStart->nLine, "Missing function argument");
}
}
}
return SXRET_OK;
}
/*
* Create an expression tree from an array of tokens.
* If successful, the root of the tree is stored in apNode[0].
* When errors,PH7 take care of generating the appropriate error message.
*/
static sxi32 ExprMakeTree(ph7_gen_state *pGen, ph7_expr_node **apNode, sxi32 nToken) {
sxi32 i, iLeft, iRight;
ph7_expr_node *pNode;
sxi32 iCur;
sxi32 rc;
if(nToken <= 0 || (nToken == 1 && apNode[0]->xCode)) {
/* TICKET 1433-17: self evaluating node */
return SXRET_OK;
}
/* Process expressions enclosed in parenthesis first */
for(iCur = 0 ; iCur < nToken ; ++iCur) {
sxi32 iNest;
/* Note that, we use strict comparison here '!=' instead of the bitwise and '&' operator
* since the LPAREN token can also be an operator [i.e: Function call].
*/
if(apNode[iCur] == 0 || apNode[iCur]->pStart->nType != PH7_TK_LPAREN) {
continue;
}
iNest = 1;
iLeft = iCur;
/* Find the closing parenthesis */
iCur++;
while(iCur < nToken) {
if(apNode[iCur]) {
if(apNode[iCur]->pStart->nType & PH7_TK_RPAREN /* ')' */) {
/* Decrement nesting level */
iNest--;
if(iNest <= 0) {
break;
}
} else if(apNode[iCur]->pStart->nType & PH7_TK_LPAREN /* '(' */) {
/* Increment nesting level */
iNest++;
}
}
iCur++;
}
if(iCur - iLeft > 1) {
/* Recurse and process this expression */
rc = ExprMakeTree(&(*pGen), &apNode[iLeft + 1], iCur - iLeft - 1);
if(rc != SXRET_OK) {
return rc;
}
}
/* Free the left and right nodes */
ExprFreeTree(&(*pGen), apNode[iLeft]);
ExprFreeTree(&(*pGen), apNode[iCur]);
apNode[iLeft] = 0;
apNode[iCur] = 0;
}
/* Process expressions enclosed in braces */
for(iCur = 0 ; iCur < nToken ; ++iCur) {
sxi32 iNest;
/* Note that, we use strict comparison here '!=' instead of the bitwise and '&' operator
* since the OCB '{' token can also be an operator [i.e: subscripting].
*/
if(apNode[iCur] == 0 || apNode[iCur]->pStart->nType != PH7_TK_OCB || apNode[iCur]->xCode == PH7_CompileArray) {
continue;
}
iNest = 1;
iLeft = iCur;
/* Find the closing parenthesis */
iCur++;
while(iCur < nToken) {
if(apNode[iCur]) {
if(apNode[iCur]->pStart->nType & PH7_TK_CCB/*'}'*/) {
/* Decrement nesting level */
iNest--;
if(iNest <= 0) {
break;
}
} else if(apNode[iCur]->pStart->nType & PH7_TK_OCB /*'{'*/) {
/* Increment nesting level */
iNest++;
}
}
iCur++;
}
if(iCur - iLeft > 1) {
/* Recurse and process this expression */
rc = ExprMakeTree(&(*pGen), &apNode[iLeft + 1], iCur - iLeft - 1);
if(rc != SXRET_OK) {
return rc;
}
}
/* Free the left and right nodes */
ExprFreeTree(&(*pGen), apNode[iLeft]);
ExprFreeTree(&(*pGen), apNode[iCur]);
apNode[iLeft] = 0;
apNode[iCur] = 0;
}
/* Handle postfix [i.e: function call,subscripting,member access] operators with precedence 2 */
iLeft = -1;
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 2 && pNode->pLeft == 0) {
if(pNode->pOp->iOp == EXPR_OP_FUNC_CALL) {
/* Collect function arguments */
sxi32 iPtr = 0;
sxi32 nFuncTok = 0;
while(nFuncTok + iCur < nToken) {
if(apNode[nFuncTok + iCur]) {
if(apNode[nFuncTok + iCur]->pStart->nType & PH7_TK_LPAREN /*'('*/) {
iPtr++;
} else if(apNode[nFuncTok + iCur]->pStart->nType & PH7_TK_RPAREN /*')'*/) {
iPtr--;
if(iPtr <= 0) {
break;
}
}
}
nFuncTok++;
}
if(nFuncTok + iCur >= nToken) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Missing right parenthesis ')'");
}
if(iLeft < 0 || !NODE_ISTERM(iLeft) /*|| ( apNode[iLeft]->pOp && apNode[iLeft]->pOp->iPrec != 2)*/) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Invalid function name");
}
if(nFuncTok > 1) {
/* Process function arguments */
rc = ExprProcessFuncArguments(&(*pGen), pNode, &apNode[iCur + 1], nFuncTok - 1);
if(rc != SXRET_OK) {
return rc;
}
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
apNode[iLeft] = 0;
for(iPtr = 1; iPtr <= nFuncTok ; iPtr++) {
apNode[iCur + iPtr] = 0;
}
} else if(pNode->pOp->iOp == EXPR_OP_SUBSCRIPT) {
/* Subscripting */
sxi32 iArrTok = iCur + 1;
sxi32 iNest = 1;
if(iLeft < 0 || apNode[iLeft] == 0 || (apNode[iLeft]->pOp == 0 && (apNode[iLeft]->xCode != PH7_CompileVariable &&
apNode[iLeft]->xCode != PH7_CompileSimpleString && apNode[iLeft]->xCode != PH7_CompileString)) ||
(apNode[iLeft]->pOp && apNode[iLeft]->pOp->iPrec != 2 /* postfix */)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "Invalid array name");
}
/* Collect index tokens */
while(iArrTok < nToken) {
if(apNode[iArrTok]) {
if(apNode[iArrTok]->pOp && apNode[iArrTok]->pOp->iOp == EXPR_OP_SUBSCRIPT && apNode[iArrTok]->pLeft == 0) {
/* Increment nesting level */
iNest++;
} else if(apNode[iArrTok]->pStart->nType & PH7_TK_CSB /*']'*/) {
/* Decrement nesting level */
iNest--;
if(iNest <= 0) {
break;
}
}
}
++iArrTok;
}
if(iArrTok > iCur + 1) {
/* Recurse and process this expression */
rc = ExprMakeTree(&(*pGen), &apNode[iCur + 1], iArrTok - iCur - 1);
if(rc != SXRET_OK) {
return rc;
}
/* Link the node to it's index */
SySetPut(&pNode->aNodeArgs, (const void *)&apNode[iCur + 1]);
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
pNode->pRight = 0;
apNode[iLeft] = 0;
for(iNest = iCur + 1 ; iNest <= iArrTok ; ++iNest) {
apNode[iNest] = 0;
}
} else {
/* Member access operators [i.e: '->','::'] */
iRight = iCur + 1;
while(iRight < nToken && apNode[iRight] == 0) {
iRight++;
}
if(iRight >= nToken || iLeft < 0 || !NODE_ISTERM(iRight) || !NODE_ISTERM(iLeft)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing/Invalid member name", &pNode->pOp->sOp);
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
if(pNode->pOp->iOp == EXPR_OP_ARROW /*'->'*/ && pNode->pLeft->pOp == 0 &&
pNode->pLeft->xCode != PH7_CompileVariable) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,
"'%z': Expecting a variable as left operand", &pNode->pOp->sOp);
}
pNode->pRight = apNode[iRight];
apNode[iLeft] = apNode[iRight] = 0;
}
}
iLeft = iCur;
}
/* Handle left associative (new, clone) operators */
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 1 && pNode->pLeft == 0) {
SyToken *pToken;
/* Get the left node */
iLeft = iCur + 1;
while(iLeft < nToken && apNode[iLeft] == 0) {
iLeft++;
}
if(iLeft >= nToken || !NODE_ISTERM(iLeft)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Expecting class constructor call",
&pNode->pOp->sOp);
}
/* Make sure the operand are of a valid type */
if(pNode->pOp->iOp == EXPR_OP_CLONE) {
/* Clone:
* Symisc eXtension: 'clone' accepts now as it's left operand:
* ++ function call (including anonymous)
* ++ array member
* ++ 'new' operator
* Example:
* clone $pObj;
* clone obj(); // function obj(){ return new Class(); }
* clone $a['object']; // $a = array('object' => new Class());
*/
if(apNode[iLeft]->pOp == 0) {
if(apNode[iLeft]->xCode != PH7_CompileVariable) {
pToken = apNode[iLeft]->pStart;
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Unexpected token '%z'",
&pNode->pOp->sOp, &pToken->sData);
}
}
} else {
/* New */
if(apNode[iLeft]->pOp == 0) {
ProcNodeConstruct xCons = apNode[iLeft]->xCode;
if(xCons != PH7_CompileVariable && xCons != PH7_CompileLiteral && xCons != PH7_CompileSimpleString) {
pToken = apNode[iLeft]->pStart;
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,
"'%z': Unexpected token '%z', expecting literal, variable or constructor call",
&pNode->pOp->sOp, &pToken->sData);
}
}
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
apNode[iLeft] = 0;
pNode->pRight = 0; /* Paranoid */
}
}
/* Handle post/pre increment/decrement [i.e: ++/--] operators with precedence 3 */
iLeft = -1;
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 3 && pNode->pLeft == 0) {
if(iLeft >= 0 && ((apNode[iLeft]->pOp && apNode[iLeft]->pOp->iPrec == 2 /* Postfix */)
|| apNode[iLeft]->xCode == PH7_CompileVariable)) {
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
apNode[iLeft] = 0;
}
}
iLeft = iCur;
}
iLeft = -1;
for(iCur = nToken - 1 ; iCur >= 0 ; iCur--) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 3 && pNode->pLeft == 0) {
if(iLeft < 0 || (apNode[iLeft]->pOp == 0 && apNode[iLeft]->xCode != PH7_CompileVariable)
|| (apNode[iLeft]->pOp && apNode[iLeft]->pOp->iPrec != 2 /* Postfix */)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z' operator needs l-value", &pNode->pOp->sOp);
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
apNode[iLeft] = 0;
/* Mark as pre-increment/decrement node */
pNode->iFlags |= EXPR_NODE_PRE_INCR;
}
iLeft = iCur;
}
/* Handle right associative unary and cast operators [i.e: !,(string),~...] with precedence 4*/
iLeft = 0;
for(iCur = nToken - 1 ; iCur >= 0 ; iCur--) {
if(apNode[iCur]) {
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 4 && pNode->pLeft == 0) {
if(iLeft > 0) {
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
apNode[iLeft] = 0;
if(pNode->pLeft && pNode->pLeft->pOp && pNode->pLeft->pOp->iPrec > 4) {
if(pNode->pLeft->pLeft == 0 || pNode->pLeft->pRight == 0) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pLeft->pStart->nLine, "'%z': Missing operand", &pNode->pLeft->pOp->sOp);
}
}
} else {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing operand", &pNode->pOp->sOp);
}
}
/* Save terminal position */
iLeft = iCur;
}
}
/* Process left and non-associative binary operators [i.e: *,/,&&,||...]*/
for(i = 7 ; i < 18 ; i++) {
iLeft = -1;
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == i && pNode->pLeft == 0) {
/* Get the right node */
iRight = iCur + 1;
while(iRight < nToken && apNode[iRight] == 0) {
iRight++;
}
if(iRight >= nToken || iLeft < 0 || !NODE_ISTERM(iRight) || !NODE_ISTERM(iLeft)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing/Invalid operand", &pNode->pOp->sOp);
}
if(pNode->pOp->iOp == EXPR_OP_REF) {
sxi32 iTmp;
/* Reference operator [i.e: '&=' ]*/
if(ExprIsModifiableValue(apNode[iLeft], FALSE) == FALSE || (apNode[iLeft]->pOp && apNode[iLeft]->pOp->iVmOp == PH7_OP_MEMBER /*->,::*/)) {
/* Left operand must be a modifiable l-value */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'&': Left operand must be a modifiable l-value");
}
if(apNode[iLeft]->pOp == 0 || apNode[iLeft]->pOp->iOp != EXPR_OP_SUBSCRIPT /*$a[] =& 14*/) {
if(ExprIsModifiableValue(apNode[iRight], TRUE) == FALSE) {
if(apNode[iRight]->pOp == 0 || (apNode[iRight]->pOp->iOp != EXPR_OP_NEW /* new */
&& apNode[iRight]->pOp->iOp != EXPR_OP_CLONE /* clone */)) {
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,
"Reference operator '&' require a variable not a constant expression as it's right operand");
}
}
}
/* Swap operands */
iTmp = iRight;
iRight = iLeft;
iLeft = iTmp;
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
pNode->pRight = apNode[iRight];
apNode[iLeft] = apNode[iRight] = 0;
}
iLeft = iCur;
}
}
/* Handle the ternary operator. (expr1) ? (expr2) : (expr3)
* Note that we do not need a precedence loop here since
* we are dealing with a single operator.
*/
iLeft = -1;
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iOp == EXPR_OP_QUESTY && pNode->pLeft == 0) {
sxi32 iNest = 1;
if(iLeft < 0 || !NODE_ISTERM(iLeft)) {
/* Missing condition */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Syntax error", &pNode->pOp->sOp);
}
/* Get the right node */
iRight = iCur + 1;
while(iRight < nToken) {
if(apNode[iRight]) {
if(apNode[iRight]->pOp && apNode[iRight]->pOp->iOp == EXPR_OP_QUESTY && apNode[iRight]->pCond == 0) {
/* Increment nesting level */
++iNest;
} else if(apNode[iRight]->pStart->nType & PH7_TK_COLON /*:*/) {
/* Decrement nesting level */
--iNest;
if(iNest <= 0) {
break;
}
}
}
iRight++;
}
if(iRight > iCur + 1) {
/* Recurse and process the then expression */
rc = ExprMakeTree(&(*pGen), &apNode[iCur + 1], iRight - iCur - 1);
if(rc != SXRET_OK) {
return rc;
}
/* Link the node to the tree */
pNode->pLeft = apNode[iCur + 1];
} else {
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing 'then' expression", &pNode->pOp->sOp);
}
apNode[iCur + 1] = 0;
if(iRight + 1 < nToken) {
/* Recurse and process the else expression */
rc = ExprMakeTree(&(*pGen), &apNode[iRight + 1], nToken - iRight - 1);
if(rc != SXRET_OK) {
return rc;
}
/* Link the node to the tree */
pNode->pRight = apNode[iRight + 1];
apNode[iRight + 1] = apNode[iRight] = 0;
} else {
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing 'else' expression", &pNode->pOp->sOp);
}
/* Point to the condition */
pNode->pCond = apNode[iLeft];
apNode[iLeft] = 0;
break;
}
iLeft = iCur;
}
/* Process right associative binary operators [i.e: '=','+=','/=']
* Note: All right associative binary operators have precedence 18
* so there is no need for a precedence loop here.
*/
iRight = -1;
for(iCur = nToken - 1 ; iCur >= 0 ; iCur--) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == 19 && pNode->pLeft == 0) {
/* Get the left node */
iLeft = iCur - 1;
while(iLeft >= 0 && apNode[iLeft] == 0) {
iLeft--;
}
if(iLeft < 0 || iRight < 0 || !NODE_ISTERM(iRight) || !NODE_ISTERM(iLeft)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing/Invalid operand", &pNode->pOp->sOp);
}
if(ExprIsModifiableValue(apNode[iLeft], FALSE) == FALSE) {
if(pNode->pOp->iVmOp == PH7_OP_STORE) {
/* Left operand must be a modifiable l-value */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine,
"'%z': Left operand must be a modifiable l-value", &pNode->pOp->sOp);
}
}
/* Link the node to the tree (Reverse) */
pNode->pLeft = apNode[iRight];
pNode->pRight = apNode[iLeft];
apNode[iLeft] = apNode[iRight] = 0;
}
iRight = iCur;
}
/* Process left associative binary operators that have the lowest precedence [i.e: and,or,xor] */
for(i = 20 ; i < 24 ; i++) {
iLeft = -1;
for(iCur = 0 ; iCur < nToken ; ++iCur) {
if(apNode[iCur] == 0) {
continue;
}
pNode = apNode[iCur];
if(pNode->pOp && pNode->pOp->iPrec == i && pNode->pLeft == 0) {
/* Get the right node */
iRight = iCur + 1;
while(iRight < nToken && apNode[iRight] == 0) {
iRight++;
}
if(iRight >= nToken || iLeft < 0 || !NODE_ISTERM(iRight) || !NODE_ISTERM(iLeft)) {
/* Syntax error */
PH7_GenCompileError(pGen, E_ERROR, pNode->pStart->nLine, "'%z': Missing/Invalid operand", &pNode->pOp->sOp);
}
/* Link the node to the tree */
pNode->pLeft = apNode[iLeft];
pNode->pRight = apNode[iRight];
apNode[iLeft] = apNode[iRight] = 0;
}
iLeft = iCur;
}
}
/* Point to the root of the expression tree */
for(iCur = 1 ; iCur < nToken ; ++iCur) {
if(apNode[iCur]) {
if((apNode[iCur]->pOp || apNode[iCur]->xCode) && apNode[0] != 0) {
PH7_GenCompileError(pGen, E_ERROR, apNode[iCur]->pStart->nLine, "Unexpected token '%z'", &apNode[iCur]->pStart->sData);
}
apNode[0] = apNode[iCur];
apNode[iCur] = 0;
}
}
return SXRET_OK;
}
/*
* Build an expression tree from the freshly extracted raw tokens.
* If successful, the root of the tree is stored in ppRoot.
* When errors,PH7 take care of generating the appropriate error message.
* This is the public interface used by the most code generator routines.
*/
PH7_PRIVATE sxi32 PH7_ExprMakeTree(ph7_gen_state *pGen, SySet *pExprNode, ph7_expr_node **ppRoot) {
ph7_expr_node **apNode;
ph7_expr_node *pNode;
sxi32 rc;
/* Reset node container */
SySetReset(pExprNode);
pNode = 0; /* Prevent compiler warning */
/* Extract nodes one after one until we hit the end of the input */
while(pGen->pIn < pGen->pEnd) {
rc = ExprExtractNode(&(*pGen), &pNode);
if(rc != SXRET_OK) {
return rc;
}
/* Save the extracted node */
SySetPut(pExprNode, (const void *)&pNode);
}
if(SySetUsed(pExprNode) < 1) {
/* Empty expression [i.e: A semi-colon;] */
*ppRoot = 0;
return SXRET_OK;
}
apNode = (ph7_expr_node **)SySetBasePtr(pExprNode);
/* Make sure we are dealing with valid nodes */
rc = ExprVerifyNodes(&(*pGen), apNode, (sxi32)SySetUsed(pExprNode));
if(rc != SXRET_OK) {
/* Don't worry about freeing memory,upper layer will
* cleanup the mess left behind.
*/
*ppRoot = 0;
return rc;
}
/* Build the tree */
rc = ExprMakeTree(&(*pGen), apNode, (sxi32)SySetUsed(pExprNode));
if(rc != SXRET_OK) {
/* Something goes wrong [i.e: Syntax error] */
*ppRoot = 0;
return rc;
}
/* Point to the root of the tree */
*ppRoot = apNode[0];
return SXRET_OK;
}