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11b4c95c6f
Aer/engine/lexer.c
belliash d3ff86f692
Correct some typos
2018-07-21 11:30:41 +02:00

901 lines
27 KiB
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/*
* Symisc PH7: An embeddable bytecode compiler and a virtual machine for the PHP(5) programming language.
* Copyright (C) 2011-2012, Symisc Systems http://ph7.symisc.net/
* Version 2.1.4
* For information on licensing,redistribution of this file,and for a DISCLAIMER OF ALL WARRANTIES
* please contact Symisc Systems via:
* legal@symisc.net
* licensing@symisc.net
* contact@symisc.net
* or visit:
* http://ph7.symisc.net/
*/
/* $SymiscID: lex.c v2.8 Ubuntu-linux 2012-07-13 01:21 stable <chm@symisc.net> $ */
#include "ph7int.h"
/*
* This file implement an efficient hand-coded,thread-safe and full-reentrant
* lexical analyzer/Tokenizer for the PH7 engine.
*/
/* Forward declaration */
static sxu32 KeywordCode(const char *z, int n);
/*
* Tokenize a raw PHP input.
* Get a single low-level token from the input file. Update the stream pointer so that
* it points to the first character beyond the extracted token.
*/
static sxi32 TokenizePHP(SyStream *pStream, SyToken *pToken, void *pUserData, void *pCtxData) {
SyString *pStr;
sxi32 rc;
/* Ignore leading white spaces */
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisSpace(pStream->zText[0])) {
/* Advance the stream cursor */
if(pStream->zText[0] == '\n') {
/* Update line counter */
pStream->nLine++;
}
pStream->zText++;
}
if(pStream->zText >= pStream->zEnd) {
/* End of input reached */
return SXERR_EOF;
}
/* Record token starting position and line */
pToken->nLine = pStream->nLine;
pToken->pUserData = 0;
pStr = &pToken->sData;
SyStringInitFromBuf(pStr, pStream->zText, 0);
if(pStream->zText[0] >= 0xc0 || SyisAlpha(pStream->zText[0]) || pStream->zText[0] == '_') {
/* The following code fragment is taken verbatim from the xPP source tree.
* xPP is a modern embeddable macro processor with advanced features useful for
* application seeking for a production quality,ready to use macro processor.
* xPP is a widely used library developed and maintained by Symisc Systems.
* You can reach the xPP home page by following this link:
* http://xpp.symisc.net/
*/
const unsigned char *zIn;
sxu32 nKeyword;
/* Isolate UTF-8 or alphanumeric stream */
if(pStream->zText[0] < 0xc0) {
pStream->zText++;
}
for(;;) {
zIn = pStream->zText;
if(zIn[0] >= 0xc0) {
zIn++;
/* UTF-8 stream */
while(zIn < pStream->zEnd && ((zIn[0] & 0xc0) == 0x80)) {
zIn++;
}
}
/* Skip alphanumeric stream */
while(zIn < pStream->zEnd && zIn[0] < 0xc0 && (SyisAlphaNum(zIn[0]) || zIn[0] == '_')) {
zIn++;
}
if(zIn == pStream->zText) {
/* Not an UTF-8 or alphanumeric stream */
break;
}
/* Synchronize pointers */
pStream->zText = zIn;
}
/* Record token length */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
nKeyword = KeywordCode(pStr->zString, (int)pStr->nByte);
if(nKeyword != PH7_TK_ID) {
if(nKeyword &
(PH7_TKWRD_NEW | PH7_TKWRD_CLONE | PH7_TKWRD_INSTANCEOF)) {
/* Alpha stream operators [i.e: new,clone,instanceof],save the operator instance for later processing */
pToken->pUserData = (void *)PH7_ExprExtractOperator(pStr, 0);
/* Mark as an operator */
pToken->nType = PH7_TK_ID | PH7_TK_OP;
} else {
/* We are dealing with a keyword [i.e: while,foreach,class...],save the keyword ID */
pToken->nType = PH7_TK_KEYWORD;
pToken->pUserData = SX_INT_TO_PTR(nKeyword);
}
} else {
/* A simple identifier */
pToken->nType = PH7_TK_ID;
}
} else {
sxi32 c;
/* Non-alpha stream */
if(pStream->zText[0] == '#' ||
(pStream->zText[0] == '/' && &pStream->zText[1] < pStream->zEnd && pStream->zText[1] == '/')) {
pStream->zText++;
/* Inline comments */
while(pStream->zText < pStream->zEnd && pStream->zText[0] != '\n') {
pStream->zText++;
}
/* Tell the upper-layer to ignore this token */
return SXERR_CONTINUE;
} else if(pStream->zText[0] == '/' && &pStream->zText[1] < pStream->zEnd && pStream->zText[1] == '*') {
pStream->zText += 2;
/* Block comment */
while(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '*') {
if(&pStream->zText[1] >= pStream->zEnd || pStream->zText[1] == '/') {
break;
}
}
if(pStream->zText[0] == '\n') {
pStream->nLine++;
}
pStream->zText++;
}
pStream->zText += 2;
/* Tell the upper-layer to ignore this token */
return SXERR_CONTINUE;
} else if(SyisDigit(pStream->zText[0])) {
pStream->zText++;
/* Decimal digit stream */
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisDigit(pStream->zText[0])) {
pStream->zText++;
}
/* Mark the token as integer until we encounter a real number */
pToken->nType = PH7_TK_INTEGER;
if(pStream->zText < pStream->zEnd) {
c = pStream->zText[0];
if(c == '.') {
/* Real number */
pStream->zText++;
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisDigit(pStream->zText[0])) {
pStream->zText++;
}
if(pStream->zText < pStream->zEnd) {
c = pStream->zText[0];
if(c == 'e' || c == 'E') {
pStream->zText++;
if(pStream->zText < pStream->zEnd) {
c = pStream->zText[0];
if((c == '+' || c == '-') && &pStream->zText[1] < pStream->zEnd &&
pStream->zText[1] < 0xc0 && SyisDigit(pStream->zText[1])) {
pStream->zText++;
}
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisDigit(pStream->zText[0])) {
pStream->zText++;
}
}
}
}
pToken->nType = PH7_TK_REAL;
} else if(c == 'e' || c == 'E') {
SXUNUSED(pUserData); /* Prevent compiler warning */
SXUNUSED(pCtxData);
pStream->zText++;
if(pStream->zText < pStream->zEnd) {
c = pStream->zText[0];
if((c == '+' || c == '-') && &pStream->zText[1] < pStream->zEnd &&
pStream->zText[1] < 0xc0 && SyisDigit(pStream->zText[1])) {
pStream->zText++;
}
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisDigit(pStream->zText[0])) {
pStream->zText++;
}
}
pToken->nType = PH7_TK_REAL;
} else if(c == 'x' || c == 'X') {
/* Hex digit stream */
pStream->zText++;
while(pStream->zText < pStream->zEnd && pStream->zText[0] < 0xc0 && SyisHex(pStream->zText[0])) {
pStream->zText++;
}
} else if(c == 'b' || c == 'B') {
/* Binary digit stream */
pStream->zText++;
while(pStream->zText < pStream->zEnd && (pStream->zText[0] == '0' || pStream->zText[0] == '1')) {
pStream->zText++;
}
}
}
/* Record token length */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
return SXRET_OK;
}
c = pStream->zText[0];
pStream->zText++; /* Advance the stream cursor */
/* Assume we are dealing with an operator*/
pToken->nType = PH7_TK_OP;
switch(c) {
case '$':
pToken->nType = PH7_TK_DOLLAR;
break;
case '{':
pToken->nType = PH7_TK_OCB;
break;
case '}':
pToken->nType = PH7_TK_CCB;
break;
case '(':
pToken->nType = PH7_TK_LPAREN;
break;
case '[':
pToken->nType |= PH7_TK_OSB;
break; /* Bitwise operation here,since the square bracket token '['
* is a potential operator [i.e: subscripting] */
case ']':
pToken->nType = PH7_TK_CSB;
break;
case ')': {
SySet *pTokSet = pStream->pSet;
/* Assemble type cast operators [i.e: (int),(float),(bool)...] */
if(pTokSet->nUsed >= 2) {
SyToken *pTmp;
/* Peek the last recognized token */
pTmp = (SyToken *)SySetPeek(pTokSet);
if(pTmp->nType & PH7_TK_KEYWORD) {
sxi32 nID = SX_PTR_TO_INT(pTmp->pUserData);
if((sxu32)nID & (PH7_TKWRD_ARRAY | PH7_TKWRD_INT | PH7_TKWRD_FLOAT | PH7_TKWRD_STRING | PH7_TKWRD_OBJECT | PH7_TKWRD_BOOL | PH7_TKWRD_UNSET)) {
pTmp = (SyToken *)SySetAt(pTokSet, pTokSet->nUsed - 2);
if(pTmp->nType & PH7_TK_LPAREN) {
/* Merge the three tokens '(' 'TYPE' ')' into a single one */
const char *zTypeCast = "(int)";
if(nID & PH7_TKWRD_FLOAT) {
zTypeCast = "(float)";
} else if(nID & PH7_TKWRD_BOOL) {
zTypeCast = "(bool)";
} else if(nID & PH7_TKWRD_STRING) {
zTypeCast = "(string)";
} else if(nID & PH7_TKWRD_ARRAY) {
zTypeCast = "(array)";
} else if(nID & PH7_TKWRD_OBJECT) {
zTypeCast = "(object)";
} else if(nID & PH7_TKWRD_UNSET) {
zTypeCast = "(unset)";
}
/* Reflect the change */
pToken->nType = PH7_TK_OP;
SyStringInitFromBuf(&pToken->sData, zTypeCast, SyStrlen(zTypeCast));
/* Save the instance associated with the type cast operator */
pToken->pUserData = (void *)PH7_ExprExtractOperator(&pToken->sData, 0);
/* Remove the two previous tokens */
pTokSet->nUsed -= 2;
return SXRET_OK;
}
}
}
}
pToken->nType = PH7_TK_RPAREN;
break;
}
case '\'': {
/* Single quoted string */
pStr->zString++;
while(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '\'') {
if(pStream->zText[-1] != '\\') {
break;
} else {
const unsigned char *zPtr = &pStream->zText[-2];
sxi32 i = 1;
while(zPtr > pStream->zInput && zPtr[0] == '\\') {
zPtr--;
i++;
}
if((i & 1) == 0) {
break;
}
}
}
if(pStream->zText[0] == '\n') {
pStream->nLine++;
}
pStream->zText++;
}
/* Record token length and type */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
pToken->nType = PH7_TK_SSTR;
/* Jump the trailing single quote */
pStream->zText++;
return SXRET_OK;
}
case '"': {
sxi32 iNest;
/* Double quoted string */
pStr->zString++;
while(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '{' && &pStream->zText[1] < pStream->zEnd && pStream->zText[1] == '$') {
iNest = 1;
pStream->zText++;
/* TICKET 1433-40: Handle braces'{}' in double quoted string where everything is allowed */
while(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '{') {
iNest++;
} else if(pStream->zText[0] == '}') {
iNest--;
if(iNest <= 0) {
pStream->zText++;
break;
}
} else if(pStream->zText[0] == '\n') {
pStream->nLine++;
}
pStream->zText++;
}
if(pStream->zText >= pStream->zEnd) {
break;
}
}
if(pStream->zText[0] == '"') {
if(pStream->zText[-1] != '\\') {
break;
} else {
const unsigned char *zPtr = &pStream->zText[-2];
sxi32 i = 1;
while(zPtr > pStream->zInput && zPtr[0] == '\\') {
zPtr--;
i++;
}
if((i & 1) == 0) {
break;
}
}
}
if(pStream->zText[0] == '\n') {
pStream->nLine++;
}
pStream->zText++;
}
/* Record token length and type */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
pToken->nType = PH7_TK_DSTR;
/* Jump the trailing quote */
pStream->zText++;
return SXRET_OK;
}
case '`': {
/* Backtick quoted string */
pStr->zString++;
while(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '`' && pStream->zText[-1] != '\\') {
break;
}
if(pStream->zText[0] == '\n') {
pStream->nLine++;
}
pStream->zText++;
}
/* Record token length and type */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
pToken->nType = PH7_TK_BSTR;
/* Jump the trailing backtick */
pStream->zText++;
return SXRET_OK;
}
case '\\':
pToken->nType = PH7_TK_NSSEP;
break;
case ':':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == ':') {
/* Current operator: '::' */
pStream->zText++;
} else {
pToken->nType = PH7_TK_COLON; /* Single colon */
}
break;
case ',':
pToken->nType |= PH7_TK_COMMA;
break; /* Comma is also an operator */
case ';':
pToken->nType = PH7_TK_SEMI;
break;
/* Handle combined operators [i.e: +=,===,!=== ...] */
case '=':
pToken->nType |= PH7_TK_EQUAL;
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '=') {
pToken->nType &= ~PH7_TK_EQUAL;
/* Current operator: == */
pStream->zText++;
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: === */
pStream->zText++;
}
} else if(pStream->zText[0] == '>') {
/* Array operator: => */
pToken->nType = PH7_TK_ARRAY_OP;
pStream->zText++;
} else {
/* TICKET 1433-0010: Reference operator '=&' */
const unsigned char *zCur = pStream->zText;
sxu32 nLine = 0;
while(zCur < pStream->zEnd && zCur[0] < 0xc0 && SyisSpace(zCur[0])) {
if(zCur[0] == '\n') {
nLine++;
}
zCur++;
}
if(zCur < pStream->zEnd && zCur[0] == '&') {
/* Current operator: =& */
pToken->nType &= ~PH7_TK_EQUAL;
SyStringInitFromBuf(pStr, "=&", sizeof("=&") - 1);
/* Update token stream */
pStream->zText = &zCur[1];
pStream->nLine += nLine;
}
}
}
break;
case '!':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: != */
pStream->zText++;
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: !== */
pStream->zText++;
}
}
break;
case '&':
pToken->nType |= PH7_TK_AMPER;
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '&') {
pToken->nType &= ~PH7_TK_AMPER;
/* Current operator: && */
pStream->zText++;
} else if(pStream->zText[0] == '=') {
pToken->nType &= ~PH7_TK_AMPER;
/* Current operator: &= */
pStream->zText++;
}
}
break;
case '|':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '|') {
/* Current operator: || */
pStream->zText++;
} else if(pStream->zText[0] == '=') {
/* Current operator: |= */
pStream->zText++;
}
}
break;
case '+':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '+') {
/* Current operator: ++ */
pStream->zText++;
} else if(pStream->zText[0] == '=') {
/* Current operator: += */
pStream->zText++;
}
}
break;
case '-':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '-') {
/* Current operator: -- */
pStream->zText++;
} else if(pStream->zText[0] == '=') {
/* Current operator: -= */
pStream->zText++;
} else if(pStream->zText[0] == '>') {
/* Current operator: -> */
pStream->zText++;
}
}
break;
case '*':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: *= */
pStream->zText++;
}
break;
case '/':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: /= */
pStream->zText++;
}
break;
case '%':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: %= */
pStream->zText++;
}
break;
case '^':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '=') {
/* Current operator: ^= */
pStream->zText++;
} else if(pStream->zText[0] == '^') {
/* Current operator: ^^ */
pStream->zText++;
}
}
break;
case '.':
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: .= */
pStream->zText++;
}
break;
case '<':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '<') {
/* Current operator: << */
pStream->zText++;
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '=') {
/* Current operator: <<= */
pStream->zText++;
}
}
} else if(pStream->zText[0] == '>') {
/* Current operator: <> */
pStream->zText++;
} else if(pStream->zText[0] == '=') {
/* Current operator: <= */
pStream->zText++;
}
}
break;
case '>':
if(pStream->zText < pStream->zEnd) {
if(pStream->zText[0] == '>') {
/* Current operator: >> */
pStream->zText++;
if(pStream->zText < pStream->zEnd && pStream->zText[0] == '=') {
/* Current operator: >>= */
pStream->zText++;
}
} else if(pStream->zText[0] == '=') {
/* Current operator: >= */
pStream->zText++;
}
}
break;
default:
break;
}
if(pStr->nByte <= 0) {
/* Record token length */
pStr->nByte = (sxu32)((const char *)pStream->zText - pStr->zString);
}
if(pToken->nType & PH7_TK_OP) {
const ph7_expr_op *pOp;
/* Check if the extracted token is an operator */
pOp = PH7_ExprExtractOperator(pStr, (SyToken *)SySetPeek(pStream->pSet));
if(pOp == 0) {
/* Not an operator */
pToken->nType &= ~PH7_TK_OP;
if(pToken->nType <= 0) {
pToken->nType = PH7_TK_OTHER;
}
} else {
/* Save the instance associated with this operator for later processing */
pToken->pUserData = (void *)pOp;
}
}
}
/* Tell the upper-layer to save the extracted token for later processing */
return SXRET_OK;
}
static sxu32 KeywordCode(const char *z, int n) {
typedef struct {
char *token;
int value;
} ph7_token;
static ph7_token pTokenLookup[] = {
{"extends", PH7_TKWRD_EXTENDS},
{"endswitch", PH7_TKWRD_ENDSWITCH},
{"switch", PH7_TKWRD_SWITCH},
{"print", PH7_TKWRD_PRINT},
{"int", PH7_TKWRD_INT},
{"require_once", PH7_TKWRD_REQONCE},
{"require", PH7_TKWRD_REQUIRE},
{"return", PH7_TKWRD_RETURN},
{"namespace", PH7_TKWRD_NAMESPACE},
{"echo", PH7_TKWRD_ECHO},
{"object", PH7_TKWRD_OBJECT},
{"throw", PH7_TKWRD_THROW},
{"bool", PH7_TKWRD_BOOL},
{"default", PH7_TKWRD_DEFAULT},
{"try", PH7_TKWRD_TRY},
{"case", PH7_TKWRD_CASE},
{"self", PH7_TKWRD_SELF},
{"final", PH7_TKWRD_FINAL},
{"list", PH7_TKWRD_LIST},
{"static", PH7_TKWRD_STATIC},
{"clone", PH7_TKWRD_CLONE},
{"new", PH7_TKWRD_NEW},
{"const", PH7_TKWRD_CONST},
{"string", PH7_TKWRD_STRING},
{"global", PH7_TKWRD_GLOBAL},
{"use", PH7_TKWRD_USE},
{"elseif", PH7_TKWRD_ELIF},
{"else", PH7_TKWRD_ELSE},
{"if", PH7_TKWRD_IF},
{"float", PH7_TKWRD_FLOAT},
{"var", PH7_TKWRD_VAR},
{"array", PH7_TKWRD_ARRAY},
{"die", PH7_TKWRD_DIE},
{"abstract", PH7_TKWRD_ABSTRACT},
{"class", PH7_TKWRD_CLASS},
{"as", PH7_TKWRD_AS},
{"continue", PH7_TKWRD_CONTINUE},
{"endif", PH7_TKWRD_ENDIF},
{"function", PH7_TKWRD_FUNCTION},
{"endwhile", PH7_TKWRD_ENDWHILE},
{"while", PH7_TKWRD_WHILE},
{"eval", PH7_TKWRD_EVAL},
{"do", PH7_TKWRD_DO},
{"exit", PH7_TKWRD_EXIT},
{"implements", PH7_TKWRD_IMPLEMENTS},
{"include_once", PH7_TKWRD_INCONCE},
{"include", PH7_TKWRD_INCLUDE},
{"empty", PH7_TKWRD_EMPTY},
{"instanceof", PH7_TKWRD_INSTANCEOF},
{"interface", PH7_TKWRD_INTERFACE},
{"endfor", PH7_TKWRD_ENDFOR},
{"endforeach", PH7_TKWRD_END4EACH},
{"for", PH7_TKWRD_FOR},
{"foreach", PH7_TKWRD_FOREACH},
{"isset", PH7_TKWRD_ISSET},
{"parent", PH7_TKWRD_PARENT},
{"private", PH7_TKWRD_PRIVATE},
{"protected", PH7_TKWRD_PROTECTED},
{"public", PH7_TKWRD_PUBLIC},
{"catch", PH7_TKWRD_CATCH},
{"unset", PH7_TKWRD_UNSET},
{"break", PH7_TKWRD_BREAK}
};
if(n < 2) {
return PH7_TK_ID;
} else {
for(ph7_token *pToken = pTokenLookup; pToken != pTokenLookup + sizeof(pTokenLookup) / sizeof(pTokenLookup[0]); pToken++) {
if(SyMemcmp(pToken->token, z, n) == 0) {
return pToken->value;
}
}
return PH7_TK_ID;
}
}
/*
* Tokenize a raw PHP input.
* This is the public tokenizer called by most code generator routines.
*/
PH7_PRIVATE sxi32 PH7_TokenizePHP(const char *zInput, sxu32 nLen, sxu32 nLineStart, SySet *pOut) {
SyLex sLexer;
sxi32 rc;
/* Initialize the lexer */
rc = SyLexInit(&sLexer, &(*pOut), TokenizePHP, 0);
if(rc != SXRET_OK) {
return rc;
}
sLexer.sStream.nLine = nLineStart;
/* Tokenize input */
rc = SyLexTokenizeInput(&sLexer, zInput, nLen, 0, 0, 0);
/* Release the lexer */
SyLexRelease(&sLexer);
/* Tokenization result */
return rc;
}
/*
* High level public tokenizer.
* Tokenize the input into PHP tokens and raw tokens [i.e: HTML,XML,Raw text...].
* According to the PHP language reference manual
* When PHP parses a file, it looks for opening and closing tags, which tell PHP
* to start and stop interpreting the code between them. Parsing in this manner allows
* PHP to be embedded in all sorts of different documents, as everything outside of a pair
* of opening and closing tags is ignored by the PHP parser. Most of the time you will see
* PHP embedded in HTML documents, as in this example.
* <?php echo 'While this is going to be parsed.'; ?>
* <p>This will also be ignored.</p>
* You can also use more advanced structures:
* Example #1 Advanced escaping
* <?php
* if ($expression) {
* ?>
* <strong>This is true.</strong>
* <?php
* } else {
* ?>
* <strong>This is false.</strong>
* <?php
* }
* ?>
* This works as expected, because when PHP hits the ?> closing tags, it simply starts outputting
* whatever it finds (except for an immediately following newline - see instruction separation ) until it hits
* another opening tag. The example given here is contrived, of course, but for outputting large blocks of text
* dropping out of PHP parsing mode is generally more efficient than sending all of the text through echo() or print().
* There are four different pairs of opening and closing tags which can be used in PHP. Three of those, <?php ?>
* <script language="php"> </script> and <? ?> are always available. The other two are short tags and ASP style
* tags, and can be turned on and off from the php.ini configuration file. As such, while some people find short tags
* and ASP style tags convenient, they are less portable, and generally not recommended.
* Note:
* Also note that if you are embedding PHP within XML or XHTML you will need to use the <?php ?> tags to remain
* compliant with standards.
* Example #2 PHP Opening and Closing Tags
* 1. <?php echo 'if you want to serve XHTML or XML documents, do it like this'; ?>
* 2. <script language="php">
* echo 'some editors (like FrontPage) don\'t
* like processing instructions';
* </script>
*
* 3. <? echo 'this is the simplest, an SGML processing instruction'; ?>
* <?= expression ?> This is a shortcut for "<? echo expression ?>"
*/
PH7_PRIVATE sxi32 PH7_TokenizeRawText(const char *zInput, sxu32 nLen, SySet *pOut) {
const char *zEnd = &zInput[nLen];
const char *zIn = zInput;
const char *zCur, *zCurEnd;
SyString sCtag = { 0, 0 }; /* Closing tag */
SyToken sToken;
SyString sDoc;
sxu32 nLine;
sxi32 iNest;
sxi32 rc;
/* Tokenize the input into PHP tokens and raw tokens */
nLine = 1;
zCur = zCurEnd = 0; /* Prevent compiler warning */
sToken.pUserData = 0;
iNest = 0;
sDoc.nByte = 0;
sDoc.zString = ""; /* cc warning */
for(;;) {
if(zIn >= zEnd) {
/* End of input reached */
break;
}
sToken.nLine = nLine;
zCur = zIn;
zCurEnd = 0;
while(zIn < zEnd) {
if(zIn[0] == '<') {
const char *zTmp = zIn; /* End of raw input marker */
zIn++;
if(zIn < zEnd) {
if(zIn[0] == '?') {
zIn++;
if((sxu32)(zEnd - zIn) >= sizeof("php") - 1 && SyStrnicmp(zIn, "php", sizeof("php") - 1) == 0) {
/* opening tag: <?php */
zIn += sizeof("php") - 1;
}
/* Look for the closing tag '?>' */
SyStringInitFromBuf(&sCtag, "?>", sizeof("?>") - 1);
zCurEnd = zTmp;
break;
}
}
} else {
if(zIn[0] == '\n') {
nLine++;
}
zIn++;
}
} /* While(zIn < zEnd) */
if(zCurEnd == 0) {
zCurEnd = zIn;
}
/* Save the raw token */
SyStringInitFromBuf(&sToken.sData, zCur, zCurEnd - zCur);
sToken.nType = PH7_TOKEN_RAW;
rc = SySetPut(&(*pOut), (const void *)&sToken);
if(rc != SXRET_OK) {
return rc;
}
if(zIn >= zEnd) {
break;
}
/* Ignore leading white space */
while(zIn < zEnd && (unsigned char)zIn[0] < 0xc0 && SyisSpace(zIn[0])) {
if(zIn[0] == '\n') {
nLine++;
}
zIn++;
}
/* Delimit the PHP chunk */
sToken.nLine = nLine;
zCur = zIn;
while((sxu32)(zEnd - zIn) >= sCtag.nByte) {
const char *zPtr;
if(SyMemcmp(zIn, sCtag.zString, sCtag.nByte) == 0 && iNest < 1) {
break;
}
for(;;) {
if(zIn[0] != '/' || (zIn[1] != '*' && zIn[1] != '/') /* && sCtag.nByte >= 2 */) {
break;
}
zIn += 2;
if(zIn[-1] == '/') {
/* Inline comment */
while(zIn < zEnd && zIn[0] != '\n') {
zIn++;
}
if(zIn >= zEnd) {
zIn--;
}
} else {
/* Block comment */
while((sxu32)(zEnd - zIn) >= sizeof("*/") - 1) {
if(zIn[0] == '*' && zIn[1] == '/') {
zIn += 2;
break;
}
if(zIn[0] == '\n') {
nLine++;
}
zIn++;
}
}
}
if(zIn[0] == '\n') {
nLine++;
if(iNest > 0) {
zIn++;
while(zIn < zEnd && (unsigned char)zIn[0] < 0xc0 && SyisSpace(zIn[0]) && zIn[0] != '\n') {
zIn++;
}
zPtr = zIn;
while(zIn < zEnd) {
if((unsigned char)zIn[0] >= 0xc0) {
/* UTF-8 stream */
zIn++;
SX_JMP_UTF8(zIn, zEnd);
} else if(!SyisAlphaNum(zIn[0]) && zIn[0] != '_') {
break;
} else {
zIn++;
}
}
if((sxu32)(zIn - zPtr) == sDoc.nByte && SyMemcmp(sDoc.zString, zPtr, sDoc.nByte) == 0) {
iNest = 0;
}
continue;
}
} else if((sxu32)(zEnd - zIn) >= sizeof("<<<") && zIn[0] == '<' && zIn[1] == '<' && zIn[2] == '<' && iNest < 1) {
zIn += sizeof("<<<") - 1;
while(zIn < zEnd && (unsigned char)zIn[0] < 0xc0 && SyisSpace(zIn[0]) && zIn[0] != '\n') {
zIn++;
}
if(zIn[0] == '"' || zIn[0] == '\'') {
zIn++;
}
zPtr = zIn;
while(zIn < zEnd) {
if((unsigned char)zIn[0] >= 0xc0) {
/* UTF-8 stream */
zIn++;
SX_JMP_UTF8(zIn, zEnd);
} else if(!SyisAlphaNum(zIn[0]) && zIn[0] != '_') {
break;
} else {
zIn++;
}
}
SyStringInitFromBuf(&sDoc, zPtr, zIn - zPtr);
SyStringFullTrim(&sDoc);
if(sDoc.nByte > 0) {
iNest++;
}
continue;
}
zIn++;
if(zIn >= zEnd) {
break;
}
}
if((sxu32)(zEnd - zIn) < sCtag.nByte) {
zIn = zEnd;
}
if(zCur < zIn) {
/* Save the PHP chunk for later processing */
sToken.nType = PH7_TOKEN_PHP;
SyStringInitFromBuf(&sToken.sData, zCur, zIn - zCur);
SyStringRightTrim(&sToken.sData); /* Trim trailing white spaces */
rc = SySetPut(&(*pOut), (const void *)&sToken);
if(rc != SXRET_OK) {
return rc;
}
}
if(zIn < zEnd) {
/* Jump the trailing closing tag */
zIn += sCtag.nByte;
}
} /* For(;;) */
return SXRET_OK;
}
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