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cssparser.c
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cssparser.c
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/*
* Copyright (c) 2007 Dan Kennedy.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of this software nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
static const char rcsid[] = "$Id: cssparser.c,v 1.8 2008/01/19 06:08:13 danielk1977 Exp $";
#include <ctype.h>
#include <assert.h>
#include "cssInt.h"
#define ISSPACE(x) isspace((unsigned char)(x))
typedef struct CssInput CssInput;
struct CssInput {
/* Current token */
CssTokenType eToken;
char *zToken;
int nToken;
/* Input text */
char *zInput; /* Input text (CSS document) */
int nInput; /* Number of bytes allocated at zInput */
int iInput; /* Offset of next token in zInput */
};
#if 0
static void inputPrintToken(pInput)
CssInput *pInput;
{
switch (pInput->eToken) {
case CT_SPACE: printf("CT_SPACE"); break;
case CT_LP: printf("CT_LP"); break;
case CT_RP: printf("CT_RP"); break;
case CT_RRP: printf("CT_RRP"); break;
case CT_LSP: printf("CT_LSP"); break;
case CT_RSP: printf("CT_RSP"); break;
case CT_SEMICOLON: printf("CT_SEMICOLON"); break;
case CT_COMMA: printf("CT_COMMA"); break;
case CT_COLON: printf("CT_COLON"); break;
case CT_PLUS: printf("CT_PLUS"); break;
case CT_DOT: printf("CT_DOT"); break;
case CT_HASH: printf("CT_HASH"); break;
case CT_EQUALS: printf("CT_EQUALS"); break;
case CT_TILDE: printf("CT_TILDE"); break;
case CT_PIPE: printf("CT_PIPE"); break;
case CT_AT: printf("CT_AT"); break;
case CT_BANG: printf("CT_BANG"); break;
case CT_STRING: printf("CT_STRING"); break;
case CT_LRP: printf("CT_LRP"); break;
case CT_GT: printf("CT_GT"); break;
case CT_STAR: printf("CT_STAR"); break;
case CT_SLASH: printf("CT_SLASH"); break;
case CT_IDENT: printf("CT_IDENT"); break;
case CT_SGML_OPEN: printf("CT_SGML_OPEN"); break;
case CT_SGML_CLOSE: printf("CT_SGML_CLOSE"); break;
case CT_SYNTAX_ERROR: printf("CT_SYNTAX_ERROR"); break;
case CT_FUNCTION: printf("CT_FUNCTION"); break;
case CT_EOF: printf("CT_EOF"); break;
}
printf(" (%d) \"%.*s\"\n",
pInput->nToken, pInput->nToken, pInput->zToken
);
}
#endif
/*
*---------------------------------------------------------------------------
*
* inputDiscardComment --
*
* Discard any comment from the current point in the input string
* *pInput.
*
* Results:
* Return 1 if a comment was found, or 0 otherwise.
*
* Side effects:
* May consume data from *pInput.
*
*---------------------------------------------------------------------------
*/
static int inputDiscardComment(pInput)
CssInput *pInput;
{
const char *z = &pInput->zInput[pInput->iInput];
int n = pInput->nInput - pInput->iInput;
if (n > 1 && z[0] == '/' && z[1] == '*') {
int i;
for (i = 4; i <= n && (z[i-1] != '/' || z[i-2] != '*'); i++) {
}
pInput->iInput += i;
/* If the previous token returned was CT_SPACE, then ignore any
* white-space that occurs immediately after a comment. This is
* so the parser can assume there will never be two CT_SPACE
* tokens in a row.
*/
if (pInput->eToken == CT_SPACE) {
while (
pInput->iInput < pInput->nInput &&
ISSPACE(pInput->zInput[pInput->iInput])
) {
pInput->iInput++;
}
}
return 1;
}
return 0;
}
/*
*---------------------------------------------------------------------------
*
* inputGetToken --
*
* Access the type, text and length of the current input token.
*
* Results:
* Return the type of the current input token.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static CssTokenType inputGetToken(pInput, pzToken, pnToken)
CssInput *pInput;
const char **pzToken; /* OUTPUT: Pointer to token */
int *pnToken; /* OUTPUT: Token length */
{
if (pzToken) *pzToken = pInput->zToken;
if (pnToken) *pnToken = pInput->nToken;
return pInput->eToken;
}
/*
*---------------------------------------------------------------------------
*
* inputNextToken --
*
* Advance the input to the next token.
*
* Results:
* Non-zero is returned if the end-of-file is reached. Otherwise zero.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static int inputNextToken(pInput)
CssInput *pInput;
{
const char *z;
int n;
int nToken;
CssTokenType eToken = CT_SYNTAX_ERROR;
/* Discard any comments from the input stream */
while (inputDiscardComment(pInput));
z = &pInput->zInput[pInput->iInput];
n = pInput->nInput - pInput->iInput;
if (n <= 0) {
pInput->eToken = CT_EOF;
pInput->zToken = 0;
pInput->nToken = 0;
return 1; /* 1 == EOF */
}
nToken = 1;
switch( z[0] ){
case ' ':
case '\n':
case '\r':
case '\t': {
/* Collapse any contiguous whitespace to a single token */
int i;
for (i = 1; ISSPACE((int)z[i]); i++) {
}
nToken = i;
eToken = CT_SPACE;
break;
}
case '{': eToken = CT_LP; break;
case '}': eToken = CT_RP; break;
case ')': eToken = CT_RRP; break;
case '(': eToken = CT_LRP; break;
case '[': eToken = CT_LSP; break;
case ']': eToken = CT_RSP; break;
case ';': eToken = CT_SEMICOLON; break;
case ',': eToken = CT_COMMA; break;
case ':': eToken = CT_COLON; break;
case '+': eToken = CT_PLUS; break;
case '>': eToken = CT_GT; break;
case '*': eToken = CT_STAR; break;
case '.': eToken = CT_DOT; break;
case '#': eToken = CT_HASH; break;
case '=': eToken = CT_EQUALS; break;
case '~': eToken = CT_TILDE; break;
case '|': eToken = CT_PIPE; break;
case '@': eToken = CT_AT; break;
case '!': eToken = CT_BANG; break;
case '/': eToken = CT_SLASH; break;
case '"': case '\'': {
char delim = z[0];
char c;
int i;
for(i=1; i<n; i++){
c = z[i];
if( c=='\\' ){
i++;
}
else if( c=='\n' ){
/* This is illegal. A CSS string cannot contain a new-line
* unless it is escaped by a '\' character. The correct
* response is to skip all the input parsed so far,
* then fall back to normal syntax-error parsing.
*/
pInput->iInput += i;
goto bad_token;
}
else if( c==delim ){
nToken = i+1;
eToken = CT_STRING;
break;
}
}
/* This is actually not a parse error. If an EOF occurs in the
* middle of a string constant, the correct behaviour is to
* act as though the string was closed with a " or ' character.
*/
break;
}
case '<': {
if (z[1] != '!' || z[2] != '-' || z[3] != '-') {
goto parse_as_token;
}
eToken = CT_SGML_OPEN;
nToken = 4;
break;
}
case '-': {
if (z[1] != '-' || z[2] != '>') {
goto parse_as_token;
}
eToken = CT_SGML_CLOSE;
nToken = 3;
break;
}
parse_as_token:
default: {
/* This must be either an identifier or a function. For the
** ASCII character range 0-127, the 'charmap' array is 1 for
** characters allowed in an identifier or function name, 0
** for characters not allowed. Allowed characters are a-z,
** 0-9, '-', '_', '%' and '\'. All unicode characters
** outside the ASCII range are allowed.
*/
static u8 charmap[128] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00-0x0F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10-0x1F */
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, /* 0x20-0x2F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0x30-0x3F */
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40-0x4F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, /* 0x50-0x5F */
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60-0x6F */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 /* 0x70-0x7F */
};
int i;
int inHexEscape = 0;
for(i=0; i<n && (z[i]<0 || charmap[(int)z[i]]); i++){
if (z[i] == '\\' && z[i + 1]) i++;
/* In CSS, a single white-space character that occurs after
* a hexadecimal escape sequence is ignored.
*/
if (isxdigit((u8)(z[i]))) {
if (i > 0 && z[i - 1] == '\\') inHexEscape = 1;
if (inHexEscape && isspace((u8)(z[i + 1]))) i++;
} else {
inHexEscape = 0;
}
}
if( i==0 ) goto bad_token;
if( i<n && z[i]=='(' ){
CssInput sInput;
memset(&sInput, 0, sizeof(CssInput));
sInput.zInput = (char *)(&z[i]);
sInput.nInput = n - i;
inputNextToken(&sInput);
eToken = inputGetToken(&sInput, 0, 0);
while (eToken != CT_RRP && eToken != CT_EOF) {
inputNextToken(&sInput);
eToken = inputGetToken(&sInput, 0, 0);
}
if( eToken!=CT_RRP ) goto bad_token;
nToken = sInput.iInput + i;
eToken = CT_FUNCTION;
} else {
nToken = i;
eToken = CT_IDENT;
}
}
}
pInput->eToken = eToken;
pInput->nToken = nToken;
pInput->zToken = (char *)z;
pInput->iInput += nToken;
return 0;
bad_token:
pInput->iInput++;
pInput->eToken = CT_SYNTAX_ERROR;
return 0;
}
/*
*---------------------------------------------------------------------------
*
* inputNextTokenIgnoreSpace --
*
* Advance the input to the next non-whitespace token.
*
* Results:
* Non-zero is returned if the end-of-file is reached. Otherwise zero.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
static int inputNextTokenIgnoreSpace(pInput)
CssInput *pInput;
{
int rc = inputNextToken(pInput);
if (rc == 0 && CT_SPACE == inputGetToken(pInput, 0, 0)) {
rc = inputNextToken(pInput);
}
assert(CT_SPACE != inputGetToken(pInput, 0, 0));
return rc;
}
/*
*---------------------------------------------------------------------------
*
* parseSyntaxError --
*
* This function is called when a syntax-error is encountered parsing
* either an "at-rule" or a CSS rule (except within the body of the
* property declaration block, that is handled seperately by
* parseDeclarationError()).
*
* If the error occured while parsing an at-rule, the isStopAtSemiColon
* argument is true. Otherwise false.
*
* If isStopAtSemiColon is false, then tokens are discarded until the
* end of the next block or the end-of-file is encountered. If
* isStopAtSemiColon at semi-colon is true, then also stop if a
* semi-colon character (i.e. ';') that is not inside a block is
* encountered.
*
* Results:
* None.
*
* Side effects:
* Consumes data from *pInput.
*
*---------------------------------------------------------------------------
*/
static void parseSyntaxError(pInput, pParse, isStopAtSemiColon)
CssInput *pInput;
CssParse *pParse;
int isStopAtSemiColon; /* True if error occured parsing an @ rule */
{
char *zToken;
int nToken;
CssTokenType eToken;
int iNest = 0;
int iErrorStart = 0;
int iErrorLength = 0;
iErrorStart = pInput->iInput;
eToken = inputGetToken(pInput, &zToken, &nToken);
while (
eToken != CT_EOF &&
(eToken != CT_SEMICOLON || iNest != 0 || !isStopAtSemiColon) &&
(eToken != CT_RP || iNest > 1)
) {
if (eToken == CT_LP) iNest++;
if (eToken == CT_RP) iNest--;
inputNextToken(pInput);
eToken = inputGetToken(pInput, 0, 0);
}
iErrorLength = pInput->iInput - iErrorStart;
if (pParse->pErrorLog) {
Tcl_Obj *pError = pParse->pErrorLog;
Tcl_ListObjAppendElement(0, pError, Tcl_NewIntObj(iErrorStart));
Tcl_ListObjAppendElement(0, pError, Tcl_NewIntObj(iErrorLength));
}
}
/*
*---------------------------------------------------------------------------
*
* parseDeclarationError --
*
* This function is called when a syntax-error is encountered within
* a declarationblock (see parseDeclarationBlock()).
*
* Results:
* None.
*
* Side effects:
* Consumes data from *pInput.
*
*---------------------------------------------------------------------------
*/
static int parseDeclarationError(pInput, pParse)
CssInput *pInput;
CssParse *pParse;
{
char *zToken;
int nToken;
CssTokenType eToken;
int iNest = 0;
int iErrorStart = 0;
int iErrorLength = 0;
iErrorStart = pInput->iInput;
eToken = inputGetToken(pInput, &zToken, &nToken);
while (
eToken != CT_EOF &&
(eToken != CT_SEMICOLON || iNest != 0) &&
(eToken != CT_RP || iNest > 0)
) {
if (eToken == CT_LP) iNest++;
if (eToken == CT_RP) iNest--;
inputNextToken(pInput);
eToken = inputGetToken(pInput, 0, 0);
}
iErrorLength = pInput->iInput - iErrorStart;
inputNextToken(pInput);
if (pParse->pErrorLog) {
Tcl_Obj *pError = pParse->pErrorLog;
Tcl_ListObjAppendElement(0, pError, Tcl_NewIntObj(iErrorStart));
Tcl_ListObjAppendElement(0, pError, Tcl_NewIntObj(iErrorLength));
}
return ((eToken == CT_SEMICOLON) ? 0: 1);
}
#define safe_isdigit(c) (isdigit((unsigned char)(c)))
/*
*---------------------------------------------------------------------------
*
* parseSelector --
*
* Results:
*
* Side effects:
*
*---------------------------------------------------------------------------
*/
static int parseSelector(pInput, pParse)
CssInput *pInput;
CssParse *pParse;
{
while (1) {
const char *zToken;
int nToken;
CssTokenType eNext;
CssTokenType eToken;
eToken = inputGetToken(pInput, &zToken, &nToken);
inputNextToken(pInput);
eNext = inputGetToken(pInput, 0, 0);
switch (eToken) {
case CT_STAR: /* Universal selector (section 5.3) */
HtmlCssSelector(pParse, CSS_SELECTOR_UNIVERSAL, 0, 0);
break;
case CT_IDENT: { /* Type selector (section 5.4) */
CssToken tType;
tType.z = zToken;
tType.n = nToken;
HtmlCssSelector(pParse, CSS_SELECTOR_TYPE, 0, &tType);
break;
}
case CT_SPACE: { /* Descendant selector (section 5.5) */
/* Three possibilities here:
*
* (a) white-space between selectors, indicating a
* descendant selector (i.e. "H1 P"), or
*
* (b) white-space before a "+" or ">" selector, or
*
* (c) white-space before the start of the properties
* block (i.e. " {color: red}").
*
* Ignore the white-space if it is either (b) or (c). Otherwise
* add a descendant selector to the parse context.
*/
if (eNext != CT_PLUS && eNext != CT_GT &&
eNext != CT_LP && eNext != CT_COMMA
) {
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_DESCENDANT, 0, 0);
}
break;
}
case CT_GT: { /* Child selector (section 5.5) */
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_CHILD, 0, 0);
/* Ignore any white-space that occurs after a '>' */
if (eNext == CT_SPACE) inputNextToken(pInput);
break;
}
case CT_COLON: {
struct _Pseudo {
char *z;
int eArg;
int twocolonsok;
} aPseudo[] = {
{"first-child", CSS_PSEUDOCLASS_FIRSTCHILD, 0},
{"last-child", CSS_PSEUDOCLASS_LASTCHILD, 0},
{"link", CSS_PSEUDOCLASS_LINK, 0},
{"visited", CSS_PSEUDOCLASS_VISITED, 0},
{"active", CSS_PSEUDOCLASS_ACTIVE, 0},
{"hover", CSS_PSEUDOCLASS_HOVER, 0},
{"focus", CSS_PSEUDOCLASS_FOCUS, 0},
{"lang", CSS_PSEUDOCLASS_LANG, 0},
{"after", CSS_PSEUDOELEMENT_AFTER, 1},
{"before", CSS_PSEUDOELEMENT_BEFORE, 1},
{"first-line", CSS_PSEUDOELEMENT_FIRSTLINE, 1},
{"first-letter", CSS_PSEUDOELEMENT_FIRSTLETTER, 1},
{0, 0}
};
int ii;
int twocolons = 0;
if (eNext == CT_COLON) {
twocolons = 1;
inputNextToken(pInput);
eNext = inputGetToken(pInput, 0, 0);
}
if (eNext != CT_IDENT) goto syntax_error;
inputGetToken(pInput, &zToken, &nToken);
for (ii = 0; aPseudo[ii].z; ii++) {
if (
nToken == strlen(aPseudo[ii].z) &&
0 == strncmp(zToken, aPseudo[ii].z, nToken) &&
aPseudo[ii].twocolonsok >= twocolons
) break;
}
if (!aPseudo[ii].z) goto syntax_error;
if (aPseudo[ii].eArg == CSS_PSEUDOCLASS_LANG){
/* TODO: Parse lang(...) */
goto syntax_error;
} else {
HtmlCssSelector(pParse, aPseudo[ii].eArg, 0, 0);
}
inputNextToken(pInput);
break;
}
case CT_PLUS: { /* Child selector (section 5.7) */
HtmlCssSelector(pParse, CSS_SELECTORCHAIN_ADJACENT, 0, 0);
/* Ignore any white-space that occurs after a '+' */
if (eNext == CT_SPACE) inputNextToken(pInput);
break;
}
case CT_DOT: { /* Class selector (section 5.8.3) */
CssToken t;
eToken = inputGetToken(pInput, &t.z, &t.n);
/* Section 4.1.3 of CSS 2.1 says that class names,
* id names and element names may not start with a digit
* or a hyphen followed by a digit.
*/
if (eToken != CT_IDENT ||
(t.z[0] == '-' && t.n > 1 && safe_isdigit(t.z[1])) ||
safe_isdigit(t.z[0])
) {
goto syntax_error;
}
HtmlCssSelector(pParse, CSS_SELECTOR_CLASS, 0, &t);
inputNextToken(pInput);
break;
}
case CT_HASH: { /* Id selector (section 5.9) */
CssToken t;
eToken = inputGetToken(pInput, &t.z, &t.n);
/* Section 4.1.3 of CSS 2.1 says that class names,
* id names and element names may not start with a digit
* or a hyphen followed by a digit.
*/
if (eToken != CT_IDENT ||
(t.z[0] == '-' && t.n > 1 && safe_isdigit(t.z[1])) ||
safe_isdigit(t.z[0])
) {
goto syntax_error;
}
HtmlCssSelector(pParse, CSS_SELECTOR_ID, 0, &t);
inputNextToken(pInput);
break;
}
case CT_LSP: { /* Attribute selector of some kind */
CssToken t1;
CssToken t2;
if (eNext == CT_SPACE) inputNextToken(pInput);
eToken = inputGetToken(pInput, &t1.z, &t1.n);
if (eToken != CT_IDENT) goto syntax_error;
inputNextToken(pInput);
eToken = inputGetToken(pInput, 0, 0);
if (eToken == CT_SPACE) {
inputNextToken(pInput);
eToken = inputGetToken(pInput, 0, 0);
}
if (eToken == CT_RSP) {
HtmlCssSelector(pParse, CSS_SELECTOR_ATTR, &t1, 0);
} else if (
eToken == CT_TILDE ||
eToken == CT_PIPE ||
eToken == CT_EQUALS
) {
if (eToken == CT_TILDE || eToken == CT_PIPE) {
CssTokenType e;
inputNextToken(pInput);
e = inputGetToken(pInput, 0, 0);
if (e != CT_EQUALS) goto syntax_error;
}
inputNextToken(pInput);
if (CT_SPACE == inputGetToken(pInput, 0, 0)) {
inputNextToken(pInput);
}
eNext = inputGetToken(pInput, &t2.z, &t2.n);
if (eNext != CT_IDENT && eNext != CT_STRING) {
goto syntax_error;
}
inputNextToken(pInput);
if (CT_SPACE == inputGetToken(pInput, 0, 0)) {
inputNextToken(pInput);
}
eNext = inputGetToken(pInput, 0, 0);
if (eNext != CT_RSP) goto syntax_error;
HtmlCssSelector(pParse, (
(eToken == CT_TILDE) ? CSS_SELECTOR_ATTRLISTVALUE :
(eToken == CT_PIPE) ? CSS_SELECTOR_ATTRHYPHEN :
CSS_SELECTOR_ATTRVALUE) , &t1, &t2
);
} else {
goto syntax_error;
}
inputNextToken(pInput);
break;
}
case CT_COMMA: {
if( !pParse->pSelector ){
goto syntax_error;
}
HtmlCssSelectorComma(pParse);
if (CT_SPACE == eNext) inputNextToken(pInput);
break;
}
case CT_LP: return 0;
default: goto syntax_error;
}
}
syntax_error:
return 1;
}
/*
*---------------------------------------------------------------------------
*
* parseDeclarationBlock --
*
* Results:
*
* Side effects:
*
*---------------------------------------------------------------------------
*/
static int parseDeclarationBlock(CssInput *pInput, CssParse *pParse){
while (1) {
CssToken tProp;
CssToken tVal;
CssTokenType eToken;
int isImportant = 0;
/* Property name */
if (inputGetToken(pInput, 0, 0) == CT_SPACE) inputNextToken(pInput);
eToken = inputGetToken(pInput, &tProp.z, &tProp.n);
if (eToken == CT_RP) return 0;
if (eToken != CT_IDENT) goto syntax_error;
/* Colon */
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, 0, 0);
if (eToken != CT_COLON) goto syntax_error;
/* Property value */
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, &tVal.z, 0);
tVal.n = 0;
while (
eToken == CT_IDENT ||
eToken == CT_STRING ||
eToken == CT_COMMA ||
eToken == CT_PLUS ||
eToken == CT_FUNCTION ||
eToken == CT_HASH ||
eToken == CT_SLASH ||
eToken == CT_DOT
) {
char *z;
int n;
inputGetToken(pInput, &z, &n);
tVal.n = (&z[n] - tVal.z);
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, 0, 0);
}
if (tVal.n == 0) goto syntax_error;
/* Check for the !IMPORTANT symbol */
if (eToken == CT_BANG) {
char *z;
int n;
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, &z, &n);
if (n != 9 || 0 != strnicmp("important", z, 9)) {
goto syntax_error;
}
isImportant = 1;
inputNextTokenIgnoreSpace(pInput);
}
eToken = inputGetToken(pInput, 0, 0);
if (eToken != CT_RP && eToken != CT_SEMICOLON && eToken != CT_EOF) {
goto syntax_error;
}
HtmlCssDeclaration(pParse, &tProp, &tVal, isImportant);
if (eToken == CT_RP || eToken == CT_EOF) return 0;
inputNextTokenIgnoreSpace(pInput);
continue;
syntax_error:
if (parseDeclarationError(pInput, pParse)) return 0;
}
return 1;
}
/*
*---------------------------------------------------------------------------
*
* parseMediaList --
*
* Tkhtml3 uses rules suitable for the following media:
*
* Results:
*
* Side effects:
*
*---------------------------------------------------------------------------
*/
static int parseMediaList(pInput, pIsMatch)
CssInput *pInput;
int *pIsMatch;
{
int media_ok = 0;
while (1) {
CssTokenType eToken;
char * zToken;
int nToken;
eToken = inputGetToken(pInput, &zToken, &nToken);
if (eToken != CT_IDENT) return 1;
if ((nToken == 3 && strnicmp("all", zToken, nToken) == 0) ||
(nToken == 6 && strnicmp("screen", zToken, nToken) == 0)
) {
media_ok = 1;
}
inputNextTokenIgnoreSpace(pInput);
if (CT_COMMA != inputGetToken(pInput, 0, 0)) break;
inputNextTokenIgnoreSpace(pInput);
}
*pIsMatch = media_ok;
return 0;
}
/*
*---------------------------------------------------------------------------
*
* parseAtRule --
*
* Results:
*
* Side effects:
*
*---------------------------------------------------------------------------
*/
static int parseAtRule(CssInput *pInput, CssParse *pParse){
char *zWord;
int nWord;
inputNextToken(pInput);
/* According to CSS2.1, white-space after the '@' character is illegal */
if (CT_IDENT != inputGetToken(pInput, &zWord, &nWord)) return 1;
if (nWord == 6 && strnicmp("import", zWord, nWord) == 0) {
CssTokenType eToken;
CssToken tToken;
int media_ok = 1;
/* If we are already into the stylesheet "body", this is a
* syntax error
*/
if (pParse->isBody) {
return 1;
}
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, &tToken.z, &tToken.n);
if (eToken != CT_STRING && eToken != CT_FUNCTION) {
return 1;
}
inputNextTokenIgnoreSpace(pInput);
eToken = inputGetToken(pInput, 0, 0);
if (eToken != CT_SEMICOLON && eToken != CT_EOF) {
if (parseMediaList(pInput, &media_ok)) return 1;
}
eToken = inputGetToken(pInput, 0, 0);
if (eToken != CT_SEMICOLON && eToken != CT_EOF) return 1;
if (media_ok) {
HtmlCssImport(pParse, &tToken);
}
}
else if (nWord == 5 && strnicmp("media", zWord, nWord) == 0) {
int media_ok;
pParse->isBody = 1;
inputNextTokenIgnoreSpace(pInput);
if (parseMediaList(pInput, &media_ok)) return 1;
if (CT_LP != inputGetToken(pInput, 0, 0)) return 1;
inputNextToken(pInput);
if (!media_ok) {
/* The media does not match. Skip tokens until the end of
* the block.
*/
int iNest = 1;
while (
(inputGetToken(pInput, 0, 0) != CT_EOF) &&
(inputGetToken(pInput, 0, 0) != CT_RP || iNest != 1)
) {
if (inputGetToken(pInput, 0, 0) == CT_LP) iNest++;
if (inputGetToken(pInput, 0, 0) == CT_RP) iNest--;
inputNextToken(pInput);
}
}
/*
}
else if (nWord == 4 && strnicmp("page", zWord, nWord) == 0) {
*/
}
else if (nWord == 7 && strnicmp("charset", zWord, nWord) == 0) {
CssTokenType eNext;
do {
inputNextTokenIgnoreSpace(pInput);
eNext = inputGetToken(pInput, 0, 0);
} while (eNext != CT_SEMICOLON && eNext != CT_EOF);
} else {
pParse->isBody = 1;
return 1;
}
return 0;
}
/*
*---------------------------------------------------------------------------
*
* HtmlCssRunParser --
*
* Parse a stylesheet document.
*
* Calls the following functions from css.c:
*
* HtmlCssDeclaration
* HtmlCssSelectorComma
* HtmlCssSelector
* HtmlCssImport
* HtmlCssRule
*
* Results:
*
* Side effects:
*
*---------------------------------------------------------------------------
*/
void HtmlCssRunParser(zInput, nInput, pParse)
const char *zInput;
int nInput;
CssParse *pParse;
{
int eToken;
CssInput sInput;
memset(&sInput, 0, sizeof(CssInput));
sInput.zInput = (char *)zInput;
sInput.nInput = nInput;
/* This function is the top-level parser. From this functions point
* of view, a CSS stylesheet is made up of statements. Each statement
* is either an at-rule or a declaration.
*/
while (0 == inputNextTokenIgnoreSpace(&sInput)) {
int isSyntaxError;