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flex.c
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/*
* $Id: flex.c 666 2008-05-15 17:47:31Z dfishburn $
*
* Copyright (c) 2008, David Fishburn
*
* This source code is released for free distribution under the terms of the
* GNU General Public License.
*
* This module contains functions for generating tags for Adobe languages.
* There are a number of different ones, but this will begin with:
* Flex
* MXML files (*.mMacromedia XML)
* ActionScript files (*.as)
*
* Flex 3 language reference
* http://livedocs.adobe.com/flex/3/langref/index.html
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include <ctype.h> /* to define isalpha () */
#include <setjmp.h>
#ifdef DEBUG
#include <stdio.h>
#endif
#include "debug.h"
#include "entry.h"
#include "keyword.h"
#include "parse.h"
#include "read.h"
#include "routines.h"
#include "vstring.h"
/*
* MACROS
*/
#define isType(token,t) (boolean) ((token)->type == (t))
#define isKeyword(token,k) (boolean) ((token)->keyword == (k))
/*
* DATA DECLARATIONS
*/
typedef enum eException { ExceptionNone, ExceptionEOF } exception_t;
/*
* Tracks class and function names already created
*/
static stringList *ClassNames;
static stringList *FunctionNames;
/* Used to specify type of keyword.
*/
typedef enum eKeywordId {
KEYWORD_NONE = -1,
KEYWORD_function,
KEYWORD_capital_function,
KEYWORD_object,
KEYWORD_capital_object,
KEYWORD_prototype,
KEYWORD_var,
KEYWORD_new,
KEYWORD_this,
KEYWORD_for,
KEYWORD_while,
KEYWORD_do,
KEYWORD_if,
KEYWORD_else,
KEYWORD_switch,
KEYWORD_try,
KEYWORD_catch,
KEYWORD_finally,
KEYWORD_public,
KEYWORD_private,
KEYWORD_static,
KEYWORD_class,
KEYWORD_id,
KEYWORD_script,
KEYWORD_cdata,
KEYWORD_mx,
KEYWORD_override
} keywordId;
/* Used to determine whether keyword is valid for the token language and
* what its ID is.
*/
typedef struct sKeywordDesc {
const char *name;
keywordId id;
} keywordDesc;
typedef enum eTokenType {
TOKEN_UNDEFINED,
TOKEN_CHARACTER,
TOKEN_CLOSE_PAREN,
TOKEN_SEMICOLON,
TOKEN_COLON,
TOKEN_COMMA,
TOKEN_KEYWORD,
TOKEN_OPEN_PAREN,
TOKEN_OPERATOR,
TOKEN_IDENTIFIER,
TOKEN_STRING,
TOKEN_PERIOD,
TOKEN_OPEN_CURLY,
TOKEN_CLOSE_CURLY,
TOKEN_EQUAL_SIGN,
TOKEN_EXCLAMATION,
TOKEN_FORWARD_SLASH,
TOKEN_OPEN_SQUARE,
TOKEN_CLOSE_SQUARE,
TOKEN_OPEN_MXML,
TOKEN_CLOSE_MXML,
TOKEN_CLOSE_SGML,
TOKEN_LESS_THAN,
TOKEN_GREATER_THAN,
TOKEN_QUESTION_MARK
} tokenType;
typedef struct sTokenInfo {
tokenType type;
keywordId keyword;
vString * string;
vString * scope;
unsigned long lineNumber;
fpos_t filePosition;
int nestLevel;
boolean ignoreTag;
boolean isClass;
} tokenInfo;
/*
* DATA DEFINITIONS
*/
static langType Lang_js;
static jmp_buf Exception;
typedef enum {
FLEXTAG_FUNCTION,
FLEXTAG_CLASS,
FLEXTAG_METHOD,
FLEXTAG_PROPERTY,
FLEXTAG_VARIABLE,
FLEXTAG_MXTAG,
FLEXTAG_COUNT
} flexKind;
static kindOption FlexKinds [] = {
{ TRUE, 'f', "function", "functions" },
{ TRUE, 'c', "class", "classes" },
{ TRUE, 'm', "method", "methods" },
{ TRUE, 'p', "property", "properties" },
{ TRUE, 'v', "variable", "global variables" },
{ TRUE, 'x', "mxtag", "mxtags" }
};
static const keywordDesc FlexKeywordTable [] = {
/* keyword keyword ID */
{ "function", KEYWORD_function },
{ "Function", KEYWORD_capital_function },
{ "object", KEYWORD_object },
{ "Object", KEYWORD_capital_object },
{ "prototype", KEYWORD_prototype },
{ "var", KEYWORD_var },
{ "new", KEYWORD_new },
{ "this", KEYWORD_this },
{ "for", KEYWORD_for },
{ "while", KEYWORD_while },
{ "do", KEYWORD_do },
{ "if", KEYWORD_if },
{ "else", KEYWORD_else },
{ "switch", KEYWORD_switch },
{ "try", KEYWORD_try },
{ "catch", KEYWORD_catch },
{ "finally", KEYWORD_finally },
{ "public", KEYWORD_public },
{ "private", KEYWORD_private },
{ "static", KEYWORD_static },
{ "class", KEYWORD_class },
{ "id", KEYWORD_id },
{ "script", KEYWORD_script },
{ "cdata", KEYWORD_cdata },
{ "mx", KEYWORD_mx },
{ "override", KEYWORD_override }
};
/*
* FUNCTION DEFINITIONS
*/
/* Recursive functions */
static void parseFunction (tokenInfo *const token);
static boolean parseBlock (tokenInfo *const token, tokenInfo *const parent);
static boolean parseLine (tokenInfo *const token);
static boolean parseActionScript (tokenInfo *const token);
static boolean isIdentChar (const int c)
{
return (boolean)
(isalpha (c) || isdigit (c) || c == '$' ||
c == '@' || c == '_' || c == '#');
}
static void buildFlexKeywordHash (void)
{
const size_t count = sizeof (FlexKeywordTable) /
sizeof (FlexKeywordTable [0]);
size_t i;
for (i = 0 ; i < count ; ++i)
{
const keywordDesc* const p = &FlexKeywordTable [i];
addKeyword (p->name, Lang_js, (int) p->id);
}
}
static tokenInfo *newToken (void)
{
tokenInfo *const token = xMalloc (1, tokenInfo);
token->type = TOKEN_UNDEFINED;
token->keyword = KEYWORD_NONE;
token->string = vStringNew ();
token->scope = vStringNew ();
token->nestLevel = 0;
token->isClass = FALSE;
token->ignoreTag = FALSE;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
return token;
}
static void deleteToken (tokenInfo *const token)
{
vStringDelete (token->string);
vStringDelete (token->scope);
eFree (token);
}
/*
* Tag generation functions
*/
static void makeConstTag (tokenInfo *const token, const flexKind kind)
{
if (FlexKinds [kind].enabled && ! token->ignoreTag )
{
const char *const name = vStringValue (token->string);
tagEntryInfo e;
initTagEntry (&e, name);
e.lineNumber = token->lineNumber;
e.filePosition = token->filePosition;
e.kindName = FlexKinds [kind].name;
e.kind = FlexKinds [kind].letter;
makeTagEntry (&e);
}
}
static void makeFlexTag (tokenInfo *const token, flexKind kind)
{
vString * fulltag;
if (FlexKinds [kind].enabled && ! token->ignoreTag )
{
DebugStatement (
debugPrintf (DEBUG_PARSE
, "\n makeFlexTag start: token isClass:%d scope:%s name:%s\n"
, token->isClass
, vStringValue(token->scope)
, vStringValue(token->string)
);
);
if (kind == FLEXTAG_FUNCTION && token->isClass )
{
kind = FLEXTAG_METHOD;
}
/*
* If a scope has been added to the token, change the token
* string to include the scope when making the tag.
*/
if ( vStringLength(token->scope) > 0 )
{
fulltag = vStringNew ();
vStringCopy(fulltag, token->scope);
vStringCatS (fulltag, ".");
vStringCatS (fulltag, vStringValue(token->string));
vStringTerminate(fulltag);
vStringCopy(token->string, fulltag);
vStringDelete (fulltag);
}
makeConstTag (token, kind);
}
}
static void makeClassTag (tokenInfo *const token)
{
vString * fulltag;
if ( ! token->ignoreTag )
{
fulltag = vStringNew ();
if (vStringLength (token->scope) > 0)
{
vStringCopy(fulltag, token->scope);
vStringCatS (fulltag, ".");
vStringCatS (fulltag, vStringValue(token->string));
}
else
{
vStringCopy(fulltag, token->string);
}
vStringTerminate(fulltag);
if ( ! stringListHas(ClassNames, vStringValue (fulltag)) )
{
stringListAdd (ClassNames, vStringNewCopy (fulltag));
makeFlexTag (token, FLEXTAG_CLASS);
}
vStringDelete (fulltag);
}
}
static void makeMXTag (tokenInfo *const token)
{
vString * fulltag;
if ( ! token->ignoreTag )
{
fulltag = vStringNew ();
if (vStringLength (token->scope) > 0)
{
vStringCopy(fulltag, token->scope);
vStringCatS (fulltag, ".");
vStringCatS (fulltag, vStringValue(token->string));
}
else
{
vStringCopy(fulltag, token->string);
}
vStringTerminate(fulltag);
makeFlexTag (token, FLEXTAG_MXTAG);
vStringDelete (fulltag);
}
}
static void makeFunctionTag (tokenInfo *const token)
{
vString * fulltag;
if ( ! token->ignoreTag )
{
fulltag = vStringNew ();
if (vStringLength (token->scope) > 0)
{
vStringCopy(fulltag, token->scope);
vStringCatS (fulltag, ".");
vStringCatS (fulltag, vStringValue(token->string));
}
else
{
vStringCopy(fulltag, token->string);
}
vStringTerminate(fulltag);
if ( ! stringListHas(FunctionNames, vStringValue (fulltag)) )
{
stringListAdd (FunctionNames, vStringNewCopy (fulltag));
makeFlexTag (token, FLEXTAG_FUNCTION);
}
vStringDelete (fulltag);
}
}
/*
* Parsing functions
*/
static void parseString (vString *const string, const int delimiter)
{
boolean end = FALSE;
while (! end)
{
int c = fileGetc ();
if (c == EOF)
end = TRUE;
else if (c == '\\')
{
c = fileGetc(); /* This maybe a ' or ". */
vStringPut(string, c);
}
else if (c == delimiter)
end = TRUE;
else
vStringPut (string, c);
}
vStringTerminate (string);
}
/* Read a C identifier beginning with "firstChar" and places it into
* "name".
*/
static void parseIdentifier (vString *const string, const int firstChar)
{
int c = firstChar;
Assert (isIdentChar (c));
do
{
vStringPut (string, c);
c = fileGetc ();
} while (isIdentChar (c));
vStringTerminate (string);
if (!isspace (c))
fileUngetc (c); /* unget non-identifier character */
}
static void readToken (tokenInfo *const token)
{
int c;
token->type = TOKEN_UNDEFINED;
token->keyword = KEYWORD_NONE;
vStringClear (token->string);
getNextChar:
do
{
c = fileGetc ();
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
while (c == '\t' || c == ' ' || c == '\n');
switch (c)
{
case EOF: longjmp (Exception, (int)ExceptionEOF); break;
case '(': token->type = TOKEN_OPEN_PAREN; break;
case ')': token->type = TOKEN_CLOSE_PAREN; break;
case ';': token->type = TOKEN_SEMICOLON; break;
case ',': token->type = TOKEN_COMMA; break;
case '.': token->type = TOKEN_PERIOD; break;
case ':': token->type = TOKEN_COLON; break;
case '{': token->type = TOKEN_OPEN_CURLY; break;
case '}': token->type = TOKEN_CLOSE_CURLY; break;
case '=': token->type = TOKEN_EQUAL_SIGN; break;
case '[': token->type = TOKEN_OPEN_SQUARE; break;
case ']': token->type = TOKEN_CLOSE_SQUARE; break;
case '?': token->type = TOKEN_QUESTION_MARK; break;
case '\'':
case '"':
token->type = TOKEN_STRING;
parseString (token->string, c);
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
break;
case '\\':
c = fileGetc ();
if (c != '\\' && c != '"' && !isspace (c))
fileUngetc (c);
token->type = TOKEN_CHARACTER;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
break;
case '/':
{
int d = fileGetc ();
if ( (d != '*') && /* is this the start of a comment? */
(d != '/') && /* is a one line comment? */
(d != '>') ) /* is this a close XML tag? */
{
fileUngetc (d);
token->type = TOKEN_FORWARD_SLASH;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (d == '*')
{
do
{
fileSkipToCharacter ('*');
c = fileGetc ();
if (c == '/')
break;
else
fileUngetc (c);
} while (c != EOF && c != '\0');
goto getNextChar;
}
else if (d == '/') /* is this the start of a comment? */
{
fileSkipToCharacter ('\n');
goto getNextChar;
}
else if (d == '>') /* is this the start of a comment? */
{
token->type = TOKEN_CLOSE_SGML;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
}
break;
}
case '<':
{
/*
* An XML comment looks like this
* <!-- anything over multiple lines -->
*/
int d = fileGetc ();
if ( (d != '!' ) && /* is this the start of a comment? */
(d != '/' ) && /* is this the start of a closing mx tag */
(d != 'm' ) ) /* is this the start of a mx tag */
{
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (d == '!')
{
int e = fileGetc ();
if ( e != '-' ) /* is this the start of a comment? */
{
fileUngetc (e);
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (e == '-')
{
int f = fileGetc ();
if ( f != '-' ) /* is this the start of a comment? */
{
fileUngetc (f);
fileUngetc (e);
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (f == '-')
{
do
{
fileSkipToCharacter ('-');
c = fileGetc ();
if (c == '-')
{
d = fileGetc ();
if (d == '>')
break;
else
{
fileUngetc (d);
fileUngetc (c);
}
break;
}
else
fileUngetc (c);
} while (c != EOF && c != '\0');
goto getNextChar;
}
}
}
}
}
else if (d == 'm')
{
int e = fileGetc ();
if ( e != 'x' ) /* continuing an mx tag */
{
fileUngetc (e);
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (e == 'x')
{
int f = fileGetc ();
if ( f != ':' ) /* is this the start of a comment? */
{
fileUngetc (f);
fileUngetc (e);
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (f == ':')
{
token->type = TOKEN_OPEN_MXML;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
}
}
}
}
else if (d == '/')
{
int e = fileGetc ();
if ( e != 'm' ) /* continuing an mx tag */
{
fileUngetc (e);
fileUngetc (d);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
int f = fileGetc ();
if ( f != 'x' ) /* continuing an mx tag */
{
fileUngetc (f);
fileUngetc (e);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (f == 'x')
{
int g = fileGetc ();
if ( g != ':' ) /* is this the start of a comment? */
{
fileUngetc (g);
fileUngetc (f);
fileUngetc (e);
token->type = TOKEN_LESS_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
else
{
if (g == ':')
{
token->type = TOKEN_CLOSE_MXML;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
}
}
}
}
}
}
}
break;
}
case '>':
token->type = TOKEN_GREATER_THAN;
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
break;
case '!':
token->type = TOKEN_EXCLAMATION;
/*token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();*/
break;
default:
if (! isIdentChar (c))
token->type = TOKEN_UNDEFINED;
else
{
parseIdentifier (token->string, c);
token->lineNumber = getSourceLineNumber ();
token->filePosition = getInputFilePosition ();
token->keyword = analyzeToken (token->string, Lang_js);
if (isKeyword (token, KEYWORD_NONE))
token->type = TOKEN_IDENTIFIER;
else
token->type = TOKEN_KEYWORD;
}
break;
}
}
static void copyToken (tokenInfo *const dest, tokenInfo *const src)
{
dest->nestLevel = src->nestLevel;
dest->lineNumber = src->lineNumber;
dest->filePosition = src->filePosition;
dest->type = src->type;
dest->keyword = src->keyword;
dest->isClass = src->isClass;
vStringCopy(dest->string, src->string);
vStringCopy(dest->scope, src->scope);
}
/*
* Token parsing functions
*/
static void skipArgumentList (tokenInfo *const token)
{
int nest_level = 0;
/*
* Other databases can have arguments with fully declared
* datatypes:
* ( name varchar(30), text binary(10) )
* So we must check for nested open and closing parantheses
*/
if (isType (token, TOKEN_OPEN_PAREN)) /* arguments? */
{
nest_level++;
while (! (isType (token, TOKEN_CLOSE_PAREN) && (nest_level == 0)))
{
readToken (token);
if (isType (token, TOKEN_OPEN_PAREN))
{
nest_level++;
}
if (isType (token, TOKEN_CLOSE_PAREN))
{
if (nest_level > 0)
{
nest_level--;
}
}
}
readToken (token);
}
}
static void skipArrayList (tokenInfo *const token)
{
int nest_level = 0;
/*
* Handle square brackets
* var name[1]
* So we must check for nested open and closing square brackets
*/
if (isType (token, TOKEN_OPEN_SQUARE)) /* arguments? */
{
nest_level++;
while (! (isType (token, TOKEN_CLOSE_SQUARE) && (nest_level == 0)))
{
readToken (token);
if (isType (token, TOKEN_OPEN_SQUARE))
{
nest_level++;
}
if (isType (token, TOKEN_CLOSE_SQUARE))
{
if (nest_level > 0)
{
nest_level--;
}
}
}
readToken (token);
}
}
static void addContext (tokenInfo* const parent, const tokenInfo* const child)
{
if (vStringLength (parent->string) > 0)
{
vStringCatS (parent->string, ".");
}
vStringCatS (parent->string, vStringValue(child->string));
vStringTerminate(parent->string);
}
static void addToScope (tokenInfo* const token, vString* const extra)
{
if (vStringLength (token->scope) > 0)
{
vStringCatS (token->scope, ".");
}
vStringCatS (token->scope, vStringValue(extra));
vStringTerminate(token->scope);
}
/*
* Scanning functions
*/
static void findCmdTerm (tokenInfo *const token)
{
/*
* Read until we find either a semicolon or closing brace.
* Any nested braces will be handled within.
*/
while (! ( isType (token, TOKEN_SEMICOLON) ||
isType (token, TOKEN_CLOSE_CURLY) ) )
{
/* Handle nested blocks */
if ( isType (token, TOKEN_OPEN_CURLY))
{
parseBlock (token, token);
}
else if ( isType (token, TOKEN_OPEN_PAREN) )
{
skipArgumentList(token);
}
else
{
readToken (token);
}
}
}
static void parseSwitch (tokenInfo *const token)
{
/*
* switch (expression){
* case value1:
* statement;
* break;
* case value2:
* statement;
* break;
* default : statement;
* }
*/
readToken (token);
if (isType (token, TOKEN_OPEN_PAREN))
{
skipArgumentList(token);
}
if (isType (token, TOKEN_OPEN_CURLY))
{
do
{
readToken (token);
} while (! (isType (token, TOKEN_CLOSE_SGML) ||
isType (token, TOKEN_CLOSE_MXML) ||
isType (token, TOKEN_CLOSE_CURLY) ||
isType (token, TOKEN_GREATER_THAN)) );
}
}
static void parseLoop (tokenInfo *const token)
{
/*
* Handles these statements
* for (x=0; x<3; x++)
* document.write("This text is repeated three times<br>");
*
* for (x=0; x<3; x++)
* {
* document.write("This text is repeated three times<br>");
* }
*
* while (number<5){
* document.write(number+"<br>");
* number++;
* }
*
* do{
* document.write(number+"<br>");
* number++;
* }
* while (number<5);
*/
if (isKeyword (token, KEYWORD_for) || isKeyword (token, KEYWORD_while))
{
readToken(token);
if (isType (token, TOKEN_OPEN_PAREN))
{
/*
* Handle nameless functions, these will only
* be considered methods.
*/
skipArgumentList(token);
}
if (isType (token, TOKEN_OPEN_CURLY))
{
/*
* This will be either a function or a class.
* We can only determine this by checking the body
* of the function. If we find a "this." we know
* it is a class, otherwise it is a function.
*/
parseBlock (token, token);
}
else
{
parseLine(token);
}
}
else if (isKeyword (token, KEYWORD_do))
{
readToken(token);
if (isType (token, TOKEN_OPEN_CURLY))
{
/*
* This will be either a function or a class.
* We can only determine this by checking the body
* of the function. If we find a "this." we know
* it is a class, otherwise it is a function.
*/
parseBlock (token, token);
}
else
{
parseLine(token);
}
readToken(token);
if (isKeyword (token, KEYWORD_while))
{
readToken(token);
if (isType (token, TOKEN_OPEN_PAREN))
{
/*
* Handle nameless functions, these will only
* be considered methods.
*/
skipArgumentList(token);
}
}
}
}
static boolean parseIf (tokenInfo *const token)
{
boolean read_next_token = TRUE;
/*
* If statements have two forms
* if ( ... )
* one line;
*
* if ( ... )
* statement;
* else
* statement
*
* if ( ... ) {
* multiple;
* statements;
* }
*
*
* if ( ... ) {
* return elem
* }
*
* This example if correctly written, but the
* else contains only 1 statement without a terminator
* since the function finishes with the closing brace.
*
* function a(flag){
* if(flag)
* test(1);
* else
* test(2)
* }
*
* TODO: Deal with statements that can optional end
* without a semi-colon. Currently this messes up
* the parsing of blocks.
* Need to somehow detect this has happened, and either
* backup a token, or skip reading the next token if
* that is possible from all code locations.
*