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Aer/engine/lexer.c

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/**
* @PROJECT PH7 Engine for the AerScript Interpreter
* @COPYRIGHT See COPYING in the top level directory
* @FILE engine/lexer.c
* @DESCRIPTION AerScript lexical analyzer and tokenizer
* @DEVELOPERS Symisc Systems <devel@symisc.net>
* Rafal Kupiec <belliash@codingworkshop.eu.org>
*/
#include "ph7int.h"
/* 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 TokenizeAerScript(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_KEYWORD_NEW | PH7_KEYWORD_CLONE | PH7_KEYWORD_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_KEYWORD_INT | PH7_KEYWORD_FLOAT | PH7_KEYWORD_STRING | PH7_KEYWORD_OBJECT | PH7_KEYWORD_BOOL | PH7_KEYWORD_CHAR | PH7_KEYWORD_CALLBACK | PH7_KEYWORD_RESOURCE | PH7_KEYWORD_VOID)) {
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_KEYWORD_FLOAT) {
zTypeCast = "(float)";
} else if(nID & PH7_KEYWORD_BOOL) {
zTypeCast = "(bool)";
} else if(nID & PH7_KEYWORD_CHAR) {
zTypeCast = "(char)";
} else if(nID & PH7_KEYWORD_STRING) {
zTypeCast = "(string)";
} else if(nID & PH7_KEYWORD_OBJECT) {
zTypeCast = "(object)";
} else if(nID & PH7_KEYWORD_CALLBACK) {
zTypeCast = "(callback)";
} else if(nID & PH7_KEYWORD_RESOURCE) {
zTypeCast = "(resource)";
} else if(nID & PH7_KEYWORD_VOID) {
zTypeCast = "(void)";
}
/* 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 '\\':
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++;
} else if(pStream->zText[0] == '>') {
/* Array operator: => */
pToken->nType = PH7_TK_ARRAY_OP;
pStream->zText++;
}
}
break;
case '!':
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) {
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++;
}
}
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[] = {
/* Object-Oriented */
{"catch", PH7_KEYWORD_CATCH},
{"class", PH7_KEYWORD_CLASS},
{"clone", PH7_KEYWORD_CLONE},
{"extends", PH7_KEYWORD_EXTENDS},
{"final", PH7_KEYWORD_FINAL},
{"finally", PH7_KEYWORD_FINALLY},
{"implements", PH7_KEYWORD_IMPLEMENTS},
{"instanceof", PH7_KEYWORD_INSTANCEOF},
{"interface", PH7_KEYWORD_INTERFACE},
{"namespace", PH7_KEYWORD_NAMESPACE},
{"new", PH7_KEYWORD_NEW},
{"parent", PH7_KEYWORD_PARENT},
{"self", PH7_KEYWORD_SELF},
{"throw", PH7_KEYWORD_THROW},
{"try", PH7_KEYWORD_TRY},
{"using", PH7_KEYWORD_USING},
{"virtual", PH7_KEYWORD_VIRTUAL},
/* Access modifiers */
{"const", PH7_KEYWORD_CONST},
{"private", PH7_KEYWORD_PRIVATE},
{"protected", PH7_KEYWORD_PROTECTED},
{"public", PH7_KEYWORD_PUBLIC},
{"static", PH7_KEYWORD_STATIC},
/* Data types */
{"bool", PH7_KEYWORD_BOOL},
{"callback", PH7_KEYWORD_CALLBACK},
{"char", PH7_KEYWORD_CHAR},
{"float", PH7_KEYWORD_FLOAT},
{"int", PH7_KEYWORD_INT},
{"mixed", PH7_KEYWORD_MIXED},
{"object", PH7_KEYWORD_OBJECT},
{"resource", PH7_KEYWORD_RESOURCE},
{"string", PH7_KEYWORD_STRING},
{"void", PH7_KEYWORD_VOID},
/* Loops & Controls */
{"as", PH7_KEYWORD_AS},
{"break", PH7_KEYWORD_BREAK},
{"case", PH7_KEYWORD_CASE},
{"continue", PH7_KEYWORD_CONTINUE},
{"default", PH7_KEYWORD_DEFAULT},
{"do", PH7_KEYWORD_DO},
{"for", PH7_KEYWORD_FOR},
{"foreach", PH7_KEYWORD_FOREACH},
{"switch", PH7_KEYWORD_SWITCH},
{"else", PH7_KEYWORD_ELSE},
{"if", PH7_KEYWORD_IF},
{"while", PH7_KEYWORD_WHILE},
/* Reserved keywords */
{"eval", PH7_KEYWORD_EVAL},
{"exit", PH7_KEYWORD_EXIT},
{"import", PH7_KEYWORD_IMPORT},
{"include", PH7_KEYWORD_INCLUDE},
{"require", PH7_KEYWORD_REQUIRE},
{"return", PH7_KEYWORD_RETURN},
};
if(n < 2) {
return PH7_TK_ID;
} else {
for(ph7_token *pToken = pTokenLookup; pToken != pTokenLookup + sizeof(pTokenLookup) / sizeof(pTokenLookup[0]); pToken++) {
if(n == SyStrlen(pToken->token) && SyStrncmp(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_TokenizeAerScript(const char *zInput, sxu32 nLen, sxu32 nLineStart, SySet *pOut) {
SyLex sLexer;
sxi32 rc;
/* Initialize the lexer */
rc = SyLexInit(&sLexer, &(*pOut), TokenizeAerScript, 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;
}
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