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python.c
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python.c
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/*
* Copyright (c) 2000-2003, Darren Hiebert
* Copyright (c) 2014-2016, Colomban Wendling <ban@herbesfolles.org>
*
* This source code is released for free distribution under the terms of the
* GNU General Public License version 2 or (at your option) any later version.
*
* This module contains functions for generating tags for Python language
* files.
*/
#include "general.h" /* must always come first */
#include <string.h>
#include "entry.h"
#include "nestlevel.h"
#include "read.h"
#include "parse.h"
#include "vstring.h"
#include "keyword.h"
#include "routines.h"
#include "debug.h"
#include "xtag.h"
#include "objpool.h"
#include "ptrarray.h"
#include "trace.h"
#define isIdentifierChar(c) \
(isalnum (c) || (c) == '_' || (c) >= 0x80)
#define newToken() (objPoolGet (TokenPool))
#define deleteToken(t) (objPoolPut (TokenPool, (t)))
enum {
KEYWORD_as,
KEYWORD_async,
KEYWORD_cdef,
KEYWORD_class,
KEYWORD_cpdef,
KEYWORD_def,
KEYWORD_extern,
KEYWORD_from,
KEYWORD_import,
KEYWORD_inline,
KEYWORD_lambda,
KEYWORD_pass,
KEYWORD_return,
KEYWORD_REST
};
typedef int keywordId; /* to allow KEYWORD_NONE */
typedef enum {
ACCESS_PRIVATE,
ACCESS_PROTECTED,
ACCESS_PUBLIC,
COUNT_ACCESS
} accessType;
static const char *const PythonAccesses[COUNT_ACCESS] = {
"private",
"protected",
"public"
};
typedef enum {
F_DECORATORS,
F_NAMEREF,
COUNT_FIELD
} pythonField;
static fieldDefinition PythonFields[COUNT_FIELD] = {
{ .name = "decorators",
.description = "decorators on functions and classes",
.enabled = false },
{ .name = "nameref",
.description = "the original name for the tag",
.enabled = true },
};
typedef enum {
K_CLASS,
K_FUNCTION,
K_METHOD,
K_VARIABLE,
K_NAMESPACE,
K_MODULE,
K_UNKNOWN,
K_PARAMETER,
K_LOCAL_VARIABLE,
COUNT_KIND
} pythonKind;
typedef enum {
PYTHON_MODULE_IMPORTED,
PYTHON_MODULE_NAMESPACE,
PYTHON_MODULE_INDIRECTLY_IMPORTED,
} pythonModuleRole;
typedef enum {
PYTHON_UNKNOWN_IMPORTED,
PYTHON_UNKNOWN_INDIRECTLY_IMPORTED,
} pythonUnknownRole;
/* Roles related to `import'
* ==========================
* import X X = (kind:module, role:imported)
*
* import X as Y X = (kind:module, role:indirectlyImported),
* Y = (kind:namespace, nameref:module:X)
* ------------------------------------------------
* Don't confuse the kind of Y with namespace role of module kind.
*
* from X import * X = (kind:module, role:namespace)
*
* from X import Y X = (kind:module, role:namespace),
* Y = (kind:unknown, role:imported, scope:module:X)
*
* from X import Y as Z X = (kind:module, role:namespace),
* Y = (kind:unknown, role:indirectlyImported, scope:module:X)
* Z = (kind:unknown, nameref:unknown:Y) */
static roleDefinition PythonModuleRoles [] = {
{ true, "imported",
"imported modules" },
{ true, "namespace",
"namespace from where classes/variables/functions are imported" },
{ true, "indirectlyImported",
"module imported in alternative name" },
};
static roleDefinition PythonUnknownRoles [] = {
{ true, "imported", "imported from the other module" },
{ true, "indirectlyImported",
"classes/variables/functions/modules imported in alternative name" },
};
static kindDefinition PythonKinds[COUNT_KIND] = {
{true, 'c', "class", "classes"},
{true, 'f', "function", "functions"},
{true, 'm', "member", "class members"},
{true, 'v', "variable", "variables"},
{true, 'I', "namespace", "name referring a module defined in other file"},
{true, 'i', "module", "modules",
.referenceOnly = true, ATTACH_ROLES(PythonModuleRoles)},
{true, 'Y', "unknown", "name referring a class/variable/function/module defined in other module",
.referenceOnly = false, ATTACH_ROLES(PythonUnknownRoles)},
{false, 'z', "parameter", "function parameters" },
{false, 'l', "local", "local variables" },
};
static const keywordTable PythonKeywordTable[] = {
/* keyword keyword ID */
{ "as", KEYWORD_as },
{ "async", KEYWORD_async },
{ "cdef", KEYWORD_cdef },
{ "cimport", KEYWORD_import },
{ "class", KEYWORD_class },
{ "cpdef", KEYWORD_cpdef },
{ "def", KEYWORD_def },
{ "extern", KEYWORD_extern },
{ "from", KEYWORD_from },
{ "import", KEYWORD_import },
{ "inline", KEYWORD_inline },
{ "lambda", KEYWORD_lambda },
{ "pass", KEYWORD_pass },
{ "return", KEYWORD_return },
};
/* Taken from https://docs.python.org/3/reference/lexical_analysis.html#keywords */
static const struct keywordGroup PythonRestKeywords = {
.value = KEYWORD_REST,
.addingUnlessExisting = true,
.keywords = {
"False", "await", "else", "import", "pass",
"None", "break", "except", "in", "raise",
"True", "class", "finally", "is", "return",
"and", "continue", "for", "lambda", "try",
"as", "def", "from", "nonlocal", "while",
"assert", "del", "global", "not", "with",
"async", "elif", "if", "or", "yield",
NULL
},
};
typedef enum eTokenType {
/* 0..255 are the byte's value */
TOKEN_EOF = 256,
TOKEN_UNDEFINED,
TOKEN_INDENT,
TOKEN_KEYWORD,
TOKEN_OPERATOR,
TOKEN_IDENTIFIER,
TOKEN_STRING,
TOKEN_ARROW, /* -> */
TOKEN_WHITESPACE,
} tokenType;
typedef struct {
int type;
keywordId keyword;
vString * string;
int indent;
unsigned long lineNumber;
MIOPos filePosition;
} tokenInfo;
struct pythonNestingLevelUserData {
int indentation;
};
#define PY_NL(nl) ((struct pythonNestingLevelUserData *) nestingLevelGetUserData (nl))
static langType Lang_python;
static unsigned int TokenContinuationDepth = 0;
static tokenInfo *NextToken = NULL;
static NestingLevels *PythonNestingLevels = NULL;
static objPool *TokenPool = NULL;
/* follows PEP-8, and always reports single-underscores as protected
* See:
* - http://www.python.org/dev/peps/pep-0008/#method-names-and-instance-variables
* - http://www.python.org/dev/peps/pep-0008/#designing-for-inheritance
*/
static accessType accessFromIdentifier (const vString *const ident,
pythonKind kind, int parentKind)
{
const char *const p = vStringValue (ident);
const size_t len = vStringLength (ident);
/* inside a function/method, private */
if (parentKind != -1 && parentKind != K_CLASS)
return ACCESS_PRIVATE;
/* not starting with "_", public */
else if (len < 1 || p[0] != '_')
return ACCESS_PUBLIC;
/* "__...__": magic methods */
else if (kind == K_FUNCTION && parentKind == K_CLASS &&
len > 3 && p[1] == '_' && p[len - 2] == '_' && p[len - 1] == '_')
return ACCESS_PUBLIC;
/* "__...": name mangling */
else if (parentKind == K_CLASS && len > 1 && p[1] == '_')
return ACCESS_PRIVATE;
/* "_...": suggested as non-public, but easily accessible */
else
return ACCESS_PROTECTED;
}
static void initPythonEntry (tagEntryInfo *const e, const tokenInfo *const token,
const pythonKind kind)
{
accessType access;
int parentKind = -1;
NestingLevel *nl;
initTagEntry (e, vStringValue (token->string), kind);
updateTagLine (e, token->lineNumber, token->filePosition);
nl = nestingLevelsGetCurrent (PythonNestingLevels);
if (nl)
{
tagEntryInfo *nlEntry = getEntryOfNestingLevel (nl);
e->extensionFields.scopeIndex = nl->corkIndex;
/* nlEntry can be NULL if a kind was disabled. But what can we do
* here? Even disabled kinds should count for the hierarchy I
* guess -- as it'd otherwise be wrong -- but with cork we're
* fucked up as there's nothing to look up. Damn. */
if (nlEntry)
{
parentKind = nlEntry->kindIndex;
/* functions directly inside classes are methods, fix it up */
if (kind == K_FUNCTION && parentKind == K_CLASS)
e->kindIndex = K_METHOD;
}
}
access = accessFromIdentifier (token->string, kind, parentKind);
e->extensionFields.access = PythonAccesses[access];
/* FIXME: should we really set isFileScope in addition to access? */
if (access == ACCESS_PRIVATE)
e->isFileScope = true;
}
static int makeClassTag (const tokenInfo *const token,
const vString *const inheritance,
const vString *const decorators)
{
if (PythonKinds[K_CLASS].enabled)
{
tagEntryInfo e;
initPythonEntry (&e, token, K_CLASS);
e.extensionFields.inheritance = inheritance ? vStringValue (inheritance) : "";
if (decorators && vStringLength (decorators) > 0)
{
attachParserField (&e, PythonFields[F_DECORATORS].ftype,
vStringValue (decorators));
}
return makeTagEntry (&e);
}
return CORK_NIL;
}
static int makeFunctionTag (const tokenInfo *const token,
const vString *const arglist,
const vString *const decorators)
{
if (PythonKinds[K_FUNCTION].enabled)
{
tagEntryInfo e;
initPythonEntry (&e, token, K_FUNCTION);
if (arglist)
e.extensionFields.signature = vStringValue (arglist);
if (decorators && vStringLength (decorators) > 0)
{
attachParserField (&e, PythonFields[F_DECORATORS].ftype,
vStringValue (decorators));
}
return makeTagEntry (&e);
}
return CORK_NIL;
}
static int makeSimplePythonTag (const tokenInfo *const token, pythonKind const kind)
{
if (PythonKinds[kind].enabled)
{
tagEntryInfo e;
initPythonEntry (&e, token, kind);
return makeTagEntry (&e);
}
return CORK_NIL;
}
static int makeSimplePythonRefTag (const tokenInfo *const token,
const vString *const altName,
pythonKind const kind,
int roleIndex, xtagType xtag)
{
if (isXtagEnabled (XTAG_REFERENCE_TAGS) &&
PythonKinds[kind].roles[roleIndex].enabled)
{
tagEntryInfo e;
initRefTagEntry (&e, vStringValue (altName ? altName : token->string),
kind, roleIndex);
updateTagLine (&e, token->lineNumber, token->filePosition);
if (xtag != XTAG_UNKNOWN)
markTagExtraBit (&e, xtag);
return makeTagEntry (&e);
}
return CORK_NIL;
}
static void *newPoolToken (void *createArg CTAGS_ATTR_UNUSED)
{
tokenInfo *token = xMalloc (1, tokenInfo);
token->string = vStringNew ();
return token;
}
static void deletePoolToken (void *data)
{
tokenInfo *token = data;
vStringDelete (token->string);
eFree (token);
}
static void clearPoolToken (void *data)
{
tokenInfo *token = data;
token->type = TOKEN_UNDEFINED;
token->keyword = KEYWORD_NONE;
token->indent = 0;
token->lineNumber = getInputLineNumber ();
token->filePosition = getInputFilePosition ();
vStringClear (token->string);
}
static void copyToken (tokenInfo *const dest, const tokenInfo *const src)
{
dest->lineNumber = src->lineNumber;
dest->filePosition = src->filePosition;
dest->type = src->type;
dest->keyword = src->keyword;
dest->indent = src->indent;
vStringCopy(dest->string, src->string);
}
/* Skip a single or double quoted string. */
static void readString (vString *const string, const int delimiter)
{
int escaped = 0;
int c;
while ((c = getcFromInputFile ()) != EOF)
{
if (escaped)
{
vStringPut (string, c);
escaped--;
}
else if (c == '\\')
escaped++;
else if (c == delimiter || c == '\n' || c == '\r')
{
if (c != delimiter)
ungetcToInputFile (c);
break;
}
else
vStringPut (string, c);
}
}
/* Skip a single or double triple quoted string. */
static void readTripleString (vString *const string, const int delimiter)
{
int c;
int escaped = 0;
int n = 0;
while ((c = getcFromInputFile ()) != EOF)
{
if (c == delimiter && ! escaped)
{
if (++n >= 3)
break;
}
else
{
for (; n > 0; n--)
vStringPut (string, delimiter);
if (c != '\\' || escaped)
vStringPut (string, c);
n = 0;
}
if (escaped)
escaped--;
else if (c == '\\')
escaped++;
}
}
static void readIdentifier (vString *const string, const int firstChar)
{
int c = firstChar;
do
{
vStringPut (string, c);
c = getcFromInputFile ();
}
while (isIdentifierChar (c));
ungetcToInputFile (c);
}
static void ungetToken (tokenInfo *const token)
{
Assert (NextToken == NULL);
NextToken = newToken ();
copyToken (NextToken, token);
}
static void readTokenFull (tokenInfo *const token, bool inclWhitespaces)
{
int c;
int n;
/* if we've got a token held back, emit it */
if (NextToken)
{
copyToken (token, NextToken);
deleteToken (NextToken);
NextToken = NULL;
return;
}
token->type = TOKEN_UNDEFINED;
token->keyword = KEYWORD_NONE;
vStringClear (token->string);
getNextChar:
n = 0;
do
{
c = getcFromInputFile ();
n++;
}
while (c == ' ' || c == '\t' || c == '\f');
token->lineNumber = getInputLineNumber ();
token->filePosition = getInputFilePosition ();
if (inclWhitespaces && n > 1 && c != '\r' && c != '\n')
{
ungetcToInputFile (c);
vStringPut (token->string, ' ');
token->type = TOKEN_WHITESPACE;
return;
}
switch (c)
{
case EOF:
token->type = TOKEN_EOF;
break;
case '\'':
case '"':
{
int d = getcFromInputFile ();
token->type = TOKEN_STRING;
vStringPut (token->string, c);
if (d != c)
{
ungetcToInputFile (d);
readString (token->string, c);
}
else if ((d = getcFromInputFile ()) == c)
readTripleString (token->string, c);
else /* empty string */
ungetcToInputFile (d);
vStringPut (token->string, c);
token->lineNumber = getInputLineNumber ();
token->filePosition = getInputFilePosition ();
break;
}
case '=':
{
int d = getcFromInputFile ();
vStringPut (token->string, c);
if (d == c)
{
vStringPut (token->string, d);
token->type = TOKEN_OPERATOR;
}
else
{
ungetcToInputFile (d);
token->type = c;
}
break;
}
case '-':
{
int d = getcFromInputFile ();
if (d == '>')
{
vStringPut (token->string, c);
vStringPut (token->string, d);
token->type = TOKEN_ARROW;
break;
}
ungetcToInputFile (d);
/* fall through */
}
case '+':
case '*':
case '%':
case '<':
case '>':
case '/':
{
int d = getcFromInputFile ();
vStringPut (token->string, c);
if (d != '=')
{
ungetcToInputFile (d);
token->type = c;
}
else
{
vStringPut (token->string, d);
token->type = TOKEN_OPERATOR;
}
break;
}
/* eats newline to implement line continuation */
case '\\':
{
int d = getcFromInputFile ();
if (d == '\r')
d = getcFromInputFile ();
if (d != '\n')
ungetcToInputFile (d);
goto getNextChar;
}
case '#': /* comment */
case '\r': /* newlines for indent */
case '\n':
{
int indent = 0;
do
{
if (c == '#')
{
do
c = getcFromInputFile ();
while (c != EOF && c != '\r' && c != '\n');
}
if (c == '\r')
{
int d = getcFromInputFile ();
if (d != '\n')
ungetcToInputFile (d);
}
indent = 0;
while ((c = getcFromInputFile ()) == ' ' || c == '\t' || c == '\f')
{
if (c == '\t')
indent += 8 - (indent % 8);
else if (c == '\f') /* yeah, it's weird */
indent = 0;
else
indent++;
}
} /* skip completely empty lines, so retry */
while (c == '\r' || c == '\n' || c == '#');
ungetcToInputFile (c);
if (TokenContinuationDepth > 0)
{
if (inclWhitespaces)
{
vStringPut (token->string, ' ');
token->type = TOKEN_WHITESPACE;
}
else
goto getNextChar;
}
else
{
token->type = TOKEN_INDENT;
token->indent = indent;
}
break;
}
default:
if (! isIdentifierChar (c))
{
vStringPut (token->string, c);
token->type = c;
}
else
{
/* FIXME: handle U, B, R and F string prefixes? */
readIdentifier (token->string, c);
token->keyword = lookupKeyword (vStringValue (token->string), Lang_python);
if (token->keyword == KEYWORD_NONE)
token->type = TOKEN_IDENTIFIER;
else
token->type = TOKEN_KEYWORD;
}
break;
}
/* handle implicit continuation lines not to emit INDENT inside brackets
* https://docs.python.org/3.6/reference/lexical_analysis.html#implicit-line-joining */
if (token->type == '(' ||
token->type == '{' ||
token->type == '[')
{
TokenContinuationDepth ++;
}
else if (TokenContinuationDepth > 0 &&
(token->type == ')' ||
token->type == '}' ||
token->type == ']'))
{
TokenContinuationDepth --;
}
}
static void readToken (tokenInfo *const token)
{
readTokenFull (token, false);
}
/*================================= parsing =================================*/
static void reprCat (vString *const repr, const tokenInfo *const token)
{
if (token->type != TOKEN_INDENT &&
token->type != TOKEN_WHITESPACE)
{
vStringCat (repr, token->string);
}
else if (vStringLength (repr) > 0 && vStringLast (repr) != ' ')
{
vStringPut (repr, ' ');
}
}
static bool skipOverPair (tokenInfo *const token, int tOpen, int tClose,
vString *const repr, bool reprOuterPair)
{
if (token->type == tOpen)
{
int depth = 1;
if (repr && reprOuterPair)
reprCat (repr, token);
do
{
readTokenFull (token, true);
if (repr && (reprOuterPair || token->type != tClose || depth > 1))
{
reprCat (repr, token);
}
if (token->type == tOpen)
depth ++;
else if (token->type == tClose)
depth --;
}
while (token->type != TOKEN_EOF && depth > 0);
}
return token->type == tClose;
}
static bool skipLambdaArglist (tokenInfo *const token, vString *const repr)
{
while (token->type != TOKEN_EOF && token->type != ':' &&
/* avoid reading too much, just in case */
token->type != TOKEN_INDENT)
{
bool readNext = true;
if (token->type == '(')
readNext = skipOverPair (token, '(', ')', repr, true);
else if (token->type == '[')
readNext = skipOverPair (token, '[', ']', repr, true);
else if (token->type == '{')
readNext = skipOverPair (token, '{', '}', repr, true);
else if (token->keyword == KEYWORD_lambda)
{ /* handle lambdas in a default value */
if (repr)
reprCat (repr, token);
readTokenFull (token, true);
readNext = skipLambdaArglist (token, repr);
if (token->type == ':')
readNext = true;
if (readNext && repr)
reprCat (repr, token);
}
else if (repr)
{
reprCat (repr, token);
}
if (readNext)
readTokenFull (token, true);
}
return false;
}
static void readQualifiedName (tokenInfo *const nameToken)
{
readToken (nameToken);
if (nameToken->type == TOKEN_IDENTIFIER ||
nameToken->type == '.')
{
vString *qualifiedName = vStringNew ();
tokenInfo *token = newToken ();
while (nameToken->type == TOKEN_IDENTIFIER ||
nameToken->type == '.')
{
vStringCat (qualifiedName, nameToken->string);
copyToken (token, nameToken);
readToken (nameToken);
}
/* put the last, non-matching, token back */
ungetToken (nameToken);
copyToken (nameToken, token);
nameToken->type = TOKEN_IDENTIFIER;
vStringCopy (nameToken->string, qualifiedName);
deleteToken (token);
vStringDelete (qualifiedName);
}
}
static bool readCDefName (tokenInfo *const token, pythonKind *kind)
{
readToken (token);
if (token->keyword == KEYWORD_extern ||
token->keyword == KEYWORD_import)
{
readToken (token);
if (token->keyword == KEYWORD_from)
return false;
}
if (token->keyword == KEYWORD_class)
{
*kind = K_CLASS;
readToken (token);
}
else
{
/* skip the optional type declaration -- everything on the same line
* until an identifier followed by "(". */
tokenInfo *candidate = newToken ();
while (token->type != TOKEN_EOF &&
token->type != TOKEN_INDENT &&
token->type != '=' &&
token->type != ',' &&
token->type != ':')
{
if (token->type == '[')
{
if (skipOverPair (token, '[', ']', NULL, false))
readToken (token);
}
else if (token->type == '(')
{
if (skipOverPair (token, '(', ')', NULL, false))
readToken (token);
}
else if (token->type == TOKEN_IDENTIFIER)
{
copyToken (candidate, token);
readToken (token);
if (token->type == '(')
{ /* okay, we really found a function, use this */
*kind = K_FUNCTION;
ungetToken (token);
copyToken (token, candidate);
break;
}
}
else
readToken (token);
}
deleteToken (candidate);
}
return token->type == TOKEN_IDENTIFIER;
}
static vString *parseParamTypeAnnotation (tokenInfo *const token,
vString *arglist)
{
TRACE_ENTER();
readToken (token);
if (token->type != ':')
{
ungetToken (token);
TRACE_LEAVE_TEXT("type != :");
return NULL;
}
reprCat (arglist, token);
int depth = 0;
vString *t = vStringNew ();
while (true)
{
readTokenFull (token, true);
if (token->type == TOKEN_WHITESPACE)
{
reprCat (arglist, token);
continue;
}
else if (token->type == TOKEN_EOF)
break;
if (token->type == '(' ||
token->type == '[' ||
token->type == '{')
depth ++;
else if (token->type == ')' ||
token->type == ']' ||
token->type == '}')
depth --;
if (depth < 0
|| (depth == 0 && (token->type == '='
|| token->type == ',')))
{
ungetToken (token);
TRACE_LEAVE_TEXT("= or ,");
return t;
}
reprCat (arglist, token);
reprCat (t, token);
}
vStringDelete (t);
TRACE_LEAVE_TEXT("return NULL");
return NULL;
}
static vString *parseReturnTypeAnnotation (tokenInfo *const token)
{
readToken (token);
if (token->type != TOKEN_ARROW)
{
ungetToken (token);
return NULL;
}
int depth = 0;
vString *t = vStringNew ();
while (true)
{
readToken (token);
if (token->type == TOKEN_EOF)
break;
if (token->type == '(' ||
token->type == '[' ||
token->type == '{')
depth ++;
else if (token->type == ')' ||
token->type == ']' ||
token->type == '}')
depth --;
if (depth == 0 && token->type == ':')
{
ungetToken (token);
return t;
}
else
reprCat (t, token);
}
vStringDelete (t);
return NULL;
}
struct typedParam {
tokenInfo *token;
vString *type;
};
static struct typedParam *makeTypedParam (tokenInfo *token, vString *type)
{
struct typedParam *p = xMalloc (1, struct typedParam);
p->token = token;
p->type = type;
return p;
}
static struct typedParam *makeTypedParamWithCopy (const tokenInfo *token, const vString *type)
{
tokenInfo *token_copied = newToken ();
copyToken (token_copied, token);
vString *type_copied = type? vStringNewCopy (type): NULL;
return makeTypedParam (token_copied, type_copied);
}
static void deleteTypedParam (struct typedParam *p)
{
deleteToken (p->token);
vStringDelete (p->type); /* NULL is acceptable. */
eFree (p);
}
static void parseArglist (tokenInfo *const token, const int kind,
vString *const arglist, ptrArray *const parameters)
{
TRACE_ENTER();
int prevTokenType = token->type;
int depth = 1;
if (kind != K_CLASS)
reprCat (arglist, token);
do
{