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-rw-r--r--Parser/lexer/lexer.c1419
1 files changed, 1419 insertions, 0 deletions
diff --git a/Parser/lexer/lexer.c b/Parser/lexer/lexer.c
new file mode 100644
index 00000000000..c7134ab868b
--- /dev/null
+++ b/Parser/lexer/lexer.c
@@ -0,0 +1,1419 @@
+#include "Python.h"
+#include "pycore_token.h"
+#include "pycore_unicodeobject.h"
+#include "errcode.h"
+
+#include "state.h"
+#include "../tokenizer/helpers.h"
+
+/* Alternate tab spacing */
+#define ALTTABSIZE 1
+
+#define is_potential_identifier_start(c) (\
+ (c >= 'a' && c <= 'z')\
+ || (c >= 'A' && c <= 'Z')\
+ || c == '_'\
+ || (c >= 128))
+
+#define is_potential_identifier_char(c) (\
+ (c >= 'a' && c <= 'z')\
+ || (c >= 'A' && c <= 'Z')\
+ || (c >= '0' && c <= '9')\
+ || c == '_'\
+ || (c >= 128))
+
+#ifdef Py_DEBUG
+static inline tokenizer_mode* TOK_GET_MODE(struct tok_state* tok) {
+ assert(tok->tok_mode_stack_index >= 0);
+ assert(tok->tok_mode_stack_index < MAXFSTRINGLEVEL);
+ return &(tok->tok_mode_stack[tok->tok_mode_stack_index]);
+}
+static inline tokenizer_mode* TOK_NEXT_MODE(struct tok_state* tok) {
+ assert(tok->tok_mode_stack_index >= 0);
+ assert(tok->tok_mode_stack_index + 1 < MAXFSTRINGLEVEL);
+ return &(tok->tok_mode_stack[++tok->tok_mode_stack_index]);
+}
+#else
+#define TOK_GET_MODE(tok) (&(tok->tok_mode_stack[tok->tok_mode_stack_index]))
+#define TOK_NEXT_MODE(tok) (&(tok->tok_mode_stack[++tok->tok_mode_stack_index]))
+#endif
+
+#define MAKE_TOKEN(token_type) _PyLexer_token_setup(tok, token, token_type, p_start, p_end)
+#define MAKE_TYPE_COMMENT_TOKEN(token_type, col_offset, end_col_offset) (\
+ _PyLexer_type_comment_token_setup(tok, token, token_type, col_offset, end_col_offset, p_start, p_end))
+
+/* Spaces in this constant are treated as "zero or more spaces or tabs" when
+ tokenizing. */
+static const char* type_comment_prefix = "# type: ";
+
+static inline int
+contains_null_bytes(const char* str, size_t size)
+{
+ return memchr(str, 0, size) != NULL;
+}
+
+/* Get next char, updating state; error code goes into tok->done */
+static int
+tok_nextc(struct tok_state *tok)
+{
+ int rc;
+ for (;;) {
+ if (tok->cur != tok->inp) {
+ tok->col_offset++;
+ return Py_CHARMASK(*tok->cur++); /* Fast path */
+ }
+ if (tok->done != E_OK) {
+ return EOF;
+ }
+ rc = tok->underflow(tok);
+#if defined(Py_DEBUG)
+ if (tok->debug) {
+ fprintf(stderr, "line[%d] = ", tok->lineno);
+ _PyTokenizer_print_escape(stderr, tok->cur, tok->inp - tok->cur);
+ fprintf(stderr, " tok->done = %d\n", tok->done);
+ }
+#endif
+ if (!rc) {
+ tok->cur = tok->inp;
+ return EOF;
+ }
+ tok->line_start = tok->cur;
+
+ if (contains_null_bytes(tok->line_start, tok->inp - tok->line_start)) {
+ _PyTokenizer_syntaxerror(tok, "source code cannot contain null bytes");
+ tok->cur = tok->inp;
+ return EOF;
+ }
+ }
+ Py_UNREACHABLE();
+}
+
+/* Back-up one character */
+static void
+tok_backup(struct tok_state *tok, int c)
+{
+ if (c != EOF) {
+ if (--tok->cur < tok->buf) {
+ Py_FatalError("tokenizer beginning of buffer");
+ }
+ if ((int)(unsigned char)*tok->cur != Py_CHARMASK(c)) {
+ Py_FatalError("tok_backup: wrong character");
+ }
+ tok->col_offset--;
+ }
+}
+
+static int
+set_fstring_expr(struct tok_state* tok, struct token *token, char c) {
+ assert(token != NULL);
+ assert(c == '}' || c == ':' || c == '!');
+ tokenizer_mode *tok_mode = TOK_GET_MODE(tok);
+
+ if (!tok_mode->f_string_debug || token->metadata) {
+ return 0;
+ }
+
+ PyObject *res = PyUnicode_DecodeUTF8(
+ tok_mode->last_expr_buffer,
+ tok_mode->last_expr_size - tok_mode->last_expr_end,
+ NULL
+ );
+ if (!res) {
+ return -1;
+ }
+ token->metadata = res;
+ return 0;
+}
+
+int
+_PyLexer_update_fstring_expr(struct tok_state *tok, char cur)
+{
+ assert(tok->cur != NULL);
+
+ Py_ssize_t size = strlen(tok->cur);
+ tokenizer_mode *tok_mode = TOK_GET_MODE(tok);
+
+ switch (cur) {
+ case 0:
+ if (!tok_mode->last_expr_buffer || tok_mode->last_expr_end >= 0) {
+ return 1;
+ }
+ char *new_buffer = PyMem_Realloc(
+ tok_mode->last_expr_buffer,
+ tok_mode->last_expr_size + size
+ );
+ if (new_buffer == NULL) {
+ PyMem_Free(tok_mode->last_expr_buffer);
+ goto error;
+ }
+ tok_mode->last_expr_buffer = new_buffer;
+ strncpy(tok_mode->last_expr_buffer + tok_mode->last_expr_size, tok->cur, size);
+ tok_mode->last_expr_size += size;
+ break;
+ case '{':
+ if (tok_mode->last_expr_buffer != NULL) {
+ PyMem_Free(tok_mode->last_expr_buffer);
+ }
+ tok_mode->last_expr_buffer = PyMem_Malloc(size);
+ if (tok_mode->last_expr_buffer == NULL) {
+ goto error;
+ }
+ tok_mode->last_expr_size = size;
+ tok_mode->last_expr_end = -1;
+ strncpy(tok_mode->last_expr_buffer, tok->cur, size);
+ break;
+ case '}':
+ case '!':
+ case ':':
+ if (tok_mode->last_expr_end == -1) {
+ tok_mode->last_expr_end = strlen(tok->start);
+ }
+ break;
+ default:
+ Py_UNREACHABLE();
+ }
+ return 1;
+error:
+ tok->done = E_NOMEM;
+ return 0;
+}
+
+static int
+lookahead(struct tok_state *tok, const char *test)
+{
+ const char *s = test;
+ int res = 0;
+ while (1) {
+ int c = tok_nextc(tok);
+ if (*s == 0) {
+ res = !is_potential_identifier_char(c);
+ }
+ else if (c == *s) {
+ s++;
+ continue;
+ }
+
+ tok_backup(tok, c);
+ while (s != test) {
+ tok_backup(tok, *--s);
+ }
+ return res;
+ }
+}
+
+static int
+verify_end_of_number(struct tok_state *tok, int c, const char *kind) {
+ if (tok->tok_extra_tokens) {
+ // When we are parsing extra tokens, we don't want to emit warnings
+ // about invalid literals, because we want to be a bit more liberal.
+ return 1;
+ }
+ /* Emit a deprecation warning only if the numeric literal is immediately
+ * followed by one of keywords which can occur after a numeric literal
+ * in valid code: "and", "else", "for", "if", "in", "is" and "or".
+ * It allows to gradually deprecate existing valid code without adding
+ * warning before error in most cases of invalid numeric literal (which
+ * would be confusing and break existing tests).
+ * Raise a syntax error with slightly better message than plain
+ * "invalid syntax" if the numeric literal is immediately followed by
+ * other keyword or identifier.
+ */
+ int r = 0;
+ if (c == 'a') {
+ r = lookahead(tok, "nd");
+ }
+ else if (c == 'e') {
+ r = lookahead(tok, "lse");
+ }
+ else if (c == 'f') {
+ r = lookahead(tok, "or");
+ }
+ else if (c == 'i') {
+ int c2 = tok_nextc(tok);
+ if (c2 == 'f' || c2 == 'n' || c2 == 's') {
+ r = 1;
+ }
+ tok_backup(tok, c2);
+ }
+ else if (c == 'o') {
+ r = lookahead(tok, "r");
+ }
+ else if (c == 'n') {
+ r = lookahead(tok, "ot");
+ }
+ if (r) {
+ tok_backup(tok, c);
+ if (_PyTokenizer_parser_warn(tok, PyExc_SyntaxWarning,
+ "invalid %s literal", kind))
+ {
+ return 0;
+ }
+ tok_nextc(tok);
+ }
+ else /* In future releases, only error will remain. */
+ if (c < 128 && is_potential_identifier_char(c)) {
+ tok_backup(tok, c);
+ _PyTokenizer_syntaxerror(tok, "invalid %s literal", kind);
+ return 0;
+ }
+ return 1;
+}
+
+/* Verify that the identifier follows PEP 3131.
+ All identifier strings are guaranteed to be "ready" unicode objects.
+ */
+static int
+verify_identifier(struct tok_state *tok)
+{
+ if (tok->tok_extra_tokens) {
+ return 1;
+ }
+ PyObject *s;
+ if (tok->decoding_erred)
+ return 0;
+ s = PyUnicode_DecodeUTF8(tok->start, tok->cur - tok->start, NULL);
+ if (s == NULL) {
+ if (PyErr_ExceptionMatches(PyExc_UnicodeDecodeError)) {
+ tok->done = E_DECODE;
+ }
+ else {
+ tok->done = E_ERROR;
+ }
+ return 0;
+ }
+ Py_ssize_t invalid = _PyUnicode_ScanIdentifier(s);
+ if (invalid < 0) {
+ Py_DECREF(s);
+ tok->done = E_ERROR;
+ return 0;
+ }
+ assert(PyUnicode_GET_LENGTH(s) > 0);
+ if (invalid < PyUnicode_GET_LENGTH(s)) {
+ Py_UCS4 ch = PyUnicode_READ_CHAR(s, invalid);
+ if (invalid + 1 < PyUnicode_GET_LENGTH(s)) {
+ /* Determine the offset in UTF-8 encoded input */
+ Py_SETREF(s, PyUnicode_Substring(s, 0, invalid + 1));
+ if (s != NULL) {
+ Py_SETREF(s, PyUnicode_AsUTF8String(s));
+ }
+ if (s == NULL) {
+ tok->done = E_ERROR;
+ return 0;
+ }
+ tok->cur = (char *)tok->start + PyBytes_GET_SIZE(s);
+ }
+ Py_DECREF(s);
+ if (Py_UNICODE_ISPRINTABLE(ch)) {
+ _PyTokenizer_syntaxerror(tok, "invalid character '%c' (U+%04X)", ch, ch);
+ }
+ else {
+ _PyTokenizer_syntaxerror(tok, "invalid non-printable character U+%04X", ch);
+ }
+ return 0;
+ }
+ Py_DECREF(s);
+ return 1;
+}
+
+static int
+tok_decimal_tail(struct tok_state *tok)
+{
+ int c;
+
+ while (1) {
+ do {
+ c = tok_nextc(tok);
+ } while (Py_ISDIGIT(c));
+ if (c != '_') {
+ break;
+ }
+ c = tok_nextc(tok);
+ if (!Py_ISDIGIT(c)) {
+ tok_backup(tok, c);
+ _PyTokenizer_syntaxerror(tok, "invalid decimal literal");
+ return 0;
+ }
+ }
+ return c;
+}
+
+static inline int
+tok_continuation_line(struct tok_state *tok) {
+ int c = tok_nextc(tok);
+ if (c == '\r') {
+ c = tok_nextc(tok);
+ }
+ if (c != '\n') {
+ tok->done = E_LINECONT;
+ return -1;
+ }
+ c = tok_nextc(tok);
+ if (c == EOF) {
+ tok->done = E_EOF;
+ tok->cur = tok->inp;
+ return -1;
+ } else {
+ tok_backup(tok, c);
+ }
+ return c;
+}
+
+static int
+tok_get_normal_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct token *token)
+{
+ int c;
+ int blankline, nonascii;
+
+ const char *p_start = NULL;
+ const char *p_end = NULL;
+ nextline:
+ tok->start = NULL;
+ tok->starting_col_offset = -1;
+ blankline = 0;
+
+
+ /* Get indentation level */
+ if (tok->atbol) {
+ int col = 0;
+ int altcol = 0;
+ tok->atbol = 0;
+ int cont_line_col = 0;
+ for (;;) {
+ c = tok_nextc(tok);
+ if (c == ' ') {
+ col++, altcol++;
+ }
+ else if (c == '\t') {
+ col = (col / tok->tabsize + 1) * tok->tabsize;
+ altcol = (altcol / ALTTABSIZE + 1) * ALTTABSIZE;
+ }
+ else if (c == '\014') {/* Control-L (formfeed) */
+ col = altcol = 0; /* For Emacs users */
+ }
+ else if (c == '\\') {
+ // Indentation cannot be split over multiple physical lines
+ // using backslashes. This means that if we found a backslash
+ // preceded by whitespace, **the first one we find** determines
+ // the level of indentation of whatever comes next.
+ cont_line_col = cont_line_col ? cont_line_col : col;
+ if ((c = tok_continuation_line(tok)) == -1) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ else {
+ break;
+ }
+ }
+ tok_backup(tok, c);
+ if (c == '#' || c == '\n' || c == '\r') {
+ /* Lines with only whitespace and/or comments
+ shouldn't affect the indentation and are
+ not passed to the parser as NEWLINE tokens,
+ except *totally* empty lines in interactive
+ mode, which signal the end of a command group. */
+ if (col == 0 && c == '\n' && tok->prompt != NULL) {
+ blankline = 0; /* Let it through */
+ }
+ else if (tok->prompt != NULL && tok->lineno == 1) {
+ /* In interactive mode, if the first line contains
+ only spaces and/or a comment, let it through. */
+ blankline = 0;
+ col = altcol = 0;
+ }
+ else {
+ blankline = 1; /* Ignore completely */
+ }
+ /* We can't jump back right here since we still
+ may need to skip to the end of a comment */
+ }
+ if (!blankline && tok->level == 0) {
+ col = cont_line_col ? cont_line_col : col;
+ altcol = cont_line_col ? cont_line_col : altcol;
+ if (col == tok->indstack[tok->indent]) {
+ /* No change */
+ if (altcol != tok->altindstack[tok->indent]) {
+ return MAKE_TOKEN(_PyTokenizer_indenterror(tok));
+ }
+ }
+ else if (col > tok->indstack[tok->indent]) {
+ /* Indent -- always one */
+ if (tok->indent+1 >= MAXINDENT) {
+ tok->done = E_TOODEEP;
+ tok->cur = tok->inp;
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ if (altcol <= tok->altindstack[tok->indent]) {
+ return MAKE_TOKEN(_PyTokenizer_indenterror(tok));
+ }
+ tok->pendin++;
+ tok->indstack[++tok->indent] = col;
+ tok->altindstack[tok->indent] = altcol;
+ }
+ else /* col < tok->indstack[tok->indent] */ {
+ /* Dedent -- any number, must be consistent */
+ while (tok->indent > 0 &&
+ col < tok->indstack[tok->indent]) {
+ tok->pendin--;
+ tok->indent--;
+ }
+ if (col != tok->indstack[tok->indent]) {
+ tok->done = E_DEDENT;
+ tok->cur = tok->inp;
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ if (altcol != tok->altindstack[tok->indent]) {
+ return MAKE_TOKEN(_PyTokenizer_indenterror(tok));
+ }
+ }
+ }
+ }
+
+ tok->start = tok->cur;
+ tok->starting_col_offset = tok->col_offset;
+
+ /* Return pending indents/dedents */
+ if (tok->pendin != 0) {
+ if (tok->pendin < 0) {
+ if (tok->tok_extra_tokens) {
+ p_start = tok->cur;
+ p_end = tok->cur;
+ }
+ tok->pendin++;
+ return MAKE_TOKEN(DEDENT);
+ }
+ else {
+ if (tok->tok_extra_tokens) {
+ p_start = tok->buf;
+ p_end = tok->cur;
+ }
+ tok->pendin--;
+ return MAKE_TOKEN(INDENT);
+ }
+ }
+
+ /* Peek ahead at the next character */
+ c = tok_nextc(tok);
+ tok_backup(tok, c);
+
+ again:
+ tok->start = NULL;
+ /* Skip spaces */
+ do {
+ c = tok_nextc(tok);
+ } while (c == ' ' || c == '\t' || c == '\014');
+
+ /* Set start of current token */
+ tok->start = tok->cur == NULL ? NULL : tok->cur - 1;
+ tok->starting_col_offset = tok->col_offset - 1;
+
+ /* Skip comment, unless it's a type comment */
+ if (c == '#') {
+
+ const char* p = NULL;
+ const char *prefix, *type_start;
+ int current_starting_col_offset;
+
+ while (c != EOF && c != '\n' && c != '\r') {
+ c = tok_nextc(tok);
+ }
+
+ if (tok->tok_extra_tokens) {
+ p = tok->start;
+ }
+
+ if (tok->type_comments) {
+ p = tok->start;
+ current_starting_col_offset = tok->starting_col_offset;
+ prefix = type_comment_prefix;
+ while (*prefix && p < tok->cur) {
+ if (*prefix == ' ') {
+ while (*p == ' ' || *p == '\t') {
+ p++;
+ current_starting_col_offset++;
+ }
+ } else if (*prefix == *p) {
+ p++;
+ current_starting_col_offset++;
+ } else {
+ break;
+ }
+
+ prefix++;
+ }
+
+ /* This is a type comment if we matched all of type_comment_prefix. */
+ if (!*prefix) {
+ int is_type_ignore = 1;
+ // +6 in order to skip the word 'ignore'
+ const char *ignore_end = p + 6;
+ const int ignore_end_col_offset = current_starting_col_offset + 6;
+ tok_backup(tok, c); /* don't eat the newline or EOF */
+
+ type_start = p;
+
+ /* A TYPE_IGNORE is "type: ignore" followed by the end of the token
+ * or anything ASCII and non-alphanumeric. */
+ is_type_ignore = (
+ tok->cur >= ignore_end && memcmp(p, "ignore", 6) == 0
+ && !(tok->cur > ignore_end
+ && ((unsigned char)ignore_end[0] >= 128 || Py_ISALNUM(ignore_end[0]))));
+
+ if (is_type_ignore) {
+ p_start = ignore_end;
+ p_end = tok->cur;
+
+ /* If this type ignore is the only thing on the line, consume the newline also. */
+ if (blankline) {
+ tok_nextc(tok);
+ tok->atbol = 1;
+ }
+ return MAKE_TYPE_COMMENT_TOKEN(TYPE_IGNORE, ignore_end_col_offset, tok->col_offset);
+ } else {
+ p_start = type_start;
+ p_end = tok->cur;
+ return MAKE_TYPE_COMMENT_TOKEN(TYPE_COMMENT, current_starting_col_offset, tok->col_offset);
+ }
+ }
+ }
+ if (tok->tok_extra_tokens) {
+ tok_backup(tok, c); /* don't eat the newline or EOF */
+ p_start = p;
+ p_end = tok->cur;
+ tok->comment_newline = blankline;
+ return MAKE_TOKEN(COMMENT);
+ }
+ }
+
+ if (tok->done == E_INTERACT_STOP) {
+ return MAKE_TOKEN(ENDMARKER);
+ }
+
+ /* Check for EOF and errors now */
+ if (c == EOF) {
+ if (tok->level) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ return MAKE_TOKEN(tok->done == E_EOF ? ENDMARKER : ERRORTOKEN);
+ }
+
+ /* Identifier (most frequent token!) */
+ nonascii = 0;
+ if (is_potential_identifier_start(c)) {
+ /* Process the various legal combinations of b"", r"", u"", and f"". */
+ int saw_b = 0, saw_r = 0, saw_u = 0, saw_f = 0;
+ while (1) {
+ if (!(saw_b || saw_u || saw_f) && (c == 'b' || c == 'B'))
+ saw_b = 1;
+ /* Since this is a backwards compatibility support literal we don't
+ want to support it in arbitrary order like byte literals. */
+ else if (!(saw_b || saw_u || saw_r || saw_f)
+ && (c == 'u'|| c == 'U')) {
+ saw_u = 1;
+ }
+ /* ur"" and ru"" are not supported */
+ else if (!(saw_r || saw_u) && (c == 'r' || c == 'R')) {
+ saw_r = 1;
+ }
+ else if (!(saw_f || saw_b || saw_u) && (c == 'f' || c == 'F')) {
+ saw_f = 1;
+ }
+ else {
+ break;
+ }
+ c = tok_nextc(tok);
+ if (c == '"' || c == '\'') {
+ if (saw_f) {
+ goto f_string_quote;
+ }
+ goto letter_quote;
+ }
+ }
+ while (is_potential_identifier_char(c)) {
+ if (c >= 128) {
+ nonascii = 1;
+ }
+ c = tok_nextc(tok);
+ }
+ tok_backup(tok, c);
+ if (nonascii && !verify_identifier(tok)) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+
+ p_start = tok->start;
+ p_end = tok->cur;
+
+ return MAKE_TOKEN(NAME);
+ }
+
+ if (c == '\r') {
+ c = tok_nextc(tok);
+ }
+
+ /* Newline */
+ if (c == '\n') {
+ tok->atbol = 1;
+ if (blankline || tok->level > 0) {
+ if (tok->tok_extra_tokens) {
+ if (tok->comment_newline) {
+ tok->comment_newline = 0;
+ }
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(NL);
+ }
+ goto nextline;
+ }
+ if (tok->comment_newline && tok->tok_extra_tokens) {
+ tok->comment_newline = 0;
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(NL);
+ }
+ p_start = tok->start;
+ p_end = tok->cur - 1; /* Leave '\n' out of the string */
+ tok->cont_line = 0;
+ return MAKE_TOKEN(NEWLINE);
+ }
+
+ /* Period or number starting with period? */
+ if (c == '.') {
+ c = tok_nextc(tok);
+ if (Py_ISDIGIT(c)) {
+ goto fraction;
+ } else if (c == '.') {
+ c = tok_nextc(tok);
+ if (c == '.') {
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(ELLIPSIS);
+ }
+ else {
+ tok_backup(tok, c);
+ }
+ tok_backup(tok, '.');
+ }
+ else {
+ tok_backup(tok, c);
+ }
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(DOT);
+ }
+
+ /* Number */
+ if (Py_ISDIGIT(c)) {
+ if (c == '0') {
+ /* Hex, octal or binary -- maybe. */
+ c = tok_nextc(tok);
+ if (c == 'x' || c == 'X') {
+ /* Hex */
+ c = tok_nextc(tok);
+ do {
+ if (c == '_') {
+ c = tok_nextc(tok);
+ }
+ if (!Py_ISXDIGIT(c)) {
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid hexadecimal literal"));
+ }
+ do {
+ c = tok_nextc(tok);
+ } while (Py_ISXDIGIT(c));
+ } while (c == '_');
+ if (!verify_end_of_number(tok, c, "hexadecimal")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ else if (c == 'o' || c == 'O') {
+ /* Octal */
+ c = tok_nextc(tok);
+ do {
+ if (c == '_') {
+ c = tok_nextc(tok);
+ }
+ if (c < '0' || c >= '8') {
+ if (Py_ISDIGIT(c)) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "invalid digit '%c' in octal literal", c));
+ }
+ else {
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid octal literal"));
+ }
+ }
+ do {
+ c = tok_nextc(tok);
+ } while ('0' <= c && c < '8');
+ } while (c == '_');
+ if (Py_ISDIGIT(c)) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "invalid digit '%c' in octal literal", c));
+ }
+ if (!verify_end_of_number(tok, c, "octal")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ else if (c == 'b' || c == 'B') {
+ /* Binary */
+ c = tok_nextc(tok);
+ do {
+ if (c == '_') {
+ c = tok_nextc(tok);
+ }
+ if (c != '0' && c != '1') {
+ if (Py_ISDIGIT(c)) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid digit '%c' in binary literal", c));
+ }
+ else {
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid binary literal"));
+ }
+ }
+ do {
+ c = tok_nextc(tok);
+ } while (c == '0' || c == '1');
+ } while (c == '_');
+ if (Py_ISDIGIT(c)) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid digit '%c' in binary literal", c));
+ }
+ if (!verify_end_of_number(tok, c, "binary")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ else {
+ int nonzero = 0;
+ /* maybe old-style octal; c is first char of it */
+ /* in any case, allow '0' as a literal */
+ while (1) {
+ if (c == '_') {
+ c = tok_nextc(tok);
+ if (!Py_ISDIGIT(c)) {
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid decimal literal"));
+ }
+ }
+ if (c != '0') {
+ break;
+ }
+ c = tok_nextc(tok);
+ }
+ char* zeros_end = tok->cur;
+ if (Py_ISDIGIT(c)) {
+ nonzero = 1;
+ c = tok_decimal_tail(tok);
+ if (c == 0) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ if (c == '.') {
+ c = tok_nextc(tok);
+ goto fraction;
+ }
+ else if (c == 'e' || c == 'E') {
+ goto exponent;
+ }
+ else if (c == 'j' || c == 'J') {
+ goto imaginary;
+ }
+ else if (nonzero && !tok->tok_extra_tokens) {
+ /* Old-style octal: now disallowed. */
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror_known_range(
+ tok, (int)(tok->start + 1 - tok->line_start),
+ (int)(zeros_end - tok->line_start),
+ "leading zeros in decimal integer "
+ "literals are not permitted; "
+ "use an 0o prefix for octal integers"));
+ }
+ if (!verify_end_of_number(tok, c, "decimal")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ }
+ else {
+ /* Decimal */
+ c = tok_decimal_tail(tok);
+ if (c == 0) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ {
+ /* Accept floating point numbers. */
+ if (c == '.') {
+ c = tok_nextc(tok);
+ fraction:
+ /* Fraction */
+ if (Py_ISDIGIT(c)) {
+ c = tok_decimal_tail(tok);
+ if (c == 0) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ }
+ if (c == 'e' || c == 'E') {
+ int e;
+ exponent:
+ e = c;
+ /* Exponent part */
+ c = tok_nextc(tok);
+ if (c == '+' || c == '-') {
+ c = tok_nextc(tok);
+ if (!Py_ISDIGIT(c)) {
+ tok_backup(tok, c);
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid decimal literal"));
+ }
+ } else if (!Py_ISDIGIT(c)) {
+ tok_backup(tok, c);
+ if (!verify_end_of_number(tok, e, "decimal")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ tok_backup(tok, e);
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(NUMBER);
+ }
+ c = tok_decimal_tail(tok);
+ if (c == 0) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ if (c == 'j' || c == 'J') {
+ /* Imaginary part */
+ imaginary:
+ c = tok_nextc(tok);
+ if (!verify_end_of_number(tok, c, "imaginary")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ else if (!verify_end_of_number(tok, c, "decimal")) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ }
+ tok_backup(tok, c);
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(NUMBER);
+ }
+
+ f_string_quote:
+ if (((Py_TOLOWER(*tok->start) == 'f' || Py_TOLOWER(*tok->start) == 'r') && (c == '\'' || c == '"'))) {
+ int quote = c;
+ int quote_size = 1; /* 1 or 3 */
+
+ /* Nodes of type STRING, especially multi line strings
+ must be handled differently in order to get both
+ the starting line number and the column offset right.
+ (cf. issue 16806) */
+ tok->first_lineno = tok->lineno;
+ tok->multi_line_start = tok->line_start;
+
+ /* Find the quote size and start of string */
+ int after_quote = tok_nextc(tok);
+ if (after_quote == quote) {
+ int after_after_quote = tok_nextc(tok);
+ if (after_after_quote == quote) {
+ quote_size = 3;
+ }
+ else {
+ // TODO: Check this
+ tok_backup(tok, after_after_quote);
+ tok_backup(tok, after_quote);
+ }
+ }
+ if (after_quote != quote) {
+ tok_backup(tok, after_quote);
+ }
+
+
+ p_start = tok->start;
+ p_end = tok->cur;
+ if (tok->tok_mode_stack_index + 1 >= MAXFSTRINGLEVEL) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "too many nested f-strings"));
+ }
+ tokenizer_mode *the_current_tok = TOK_NEXT_MODE(tok);
+ the_current_tok->kind = TOK_FSTRING_MODE;
+ the_current_tok->f_string_quote = quote;
+ the_current_tok->f_string_quote_size = quote_size;
+ the_current_tok->f_string_start = tok->start;
+ the_current_tok->f_string_multi_line_start = tok->line_start;
+ the_current_tok->f_string_line_start = tok->lineno;
+ the_current_tok->f_string_start_offset = -1;
+ the_current_tok->f_string_multi_line_start_offset = -1;
+ the_current_tok->last_expr_buffer = NULL;
+ the_current_tok->last_expr_size = 0;
+ the_current_tok->last_expr_end = -1;
+ the_current_tok->f_string_debug = 0;
+
+ switch (*tok->start) {
+ case 'F':
+ case 'f':
+ the_current_tok->f_string_raw = Py_TOLOWER(*(tok->start + 1)) == 'r';
+ break;
+ case 'R':
+ case 'r':
+ the_current_tok->f_string_raw = 1;
+ break;
+ default:
+ Py_UNREACHABLE();
+ }
+
+ the_current_tok->curly_bracket_depth = 0;
+ the_current_tok->curly_bracket_expr_start_depth = -1;
+ return MAKE_TOKEN(FSTRING_START);
+ }
+
+ letter_quote:
+ /* String */
+ if (c == '\'' || c == '"') {
+ int quote = c;
+ int quote_size = 1; /* 1 or 3 */
+ int end_quote_size = 0;
+
+ /* Nodes of type STRING, especially multi line strings
+ must be handled differently in order to get both
+ the starting line number and the column offset right.
+ (cf. issue 16806) */
+ tok->first_lineno = tok->lineno;
+ tok->multi_line_start = tok->line_start;
+
+ /* Find the quote size and start of string */
+ c = tok_nextc(tok);
+ if (c == quote) {
+ c = tok_nextc(tok);
+ if (c == quote) {
+ quote_size = 3;
+ }
+ else {
+ end_quote_size = 1; /* empty string found */
+ }
+ }
+ if (c != quote) {
+ tok_backup(tok, c);
+ }
+
+ /* Get rest of string */
+ while (end_quote_size != quote_size) {
+ c = tok_nextc(tok);
+ if (tok->done == E_ERROR) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ if (tok->done == E_DECODE) {
+ break;
+ }
+ if (c == EOF || (quote_size == 1 && c == '\n')) {
+ assert(tok->multi_line_start != NULL);
+ // shift the tok_state's location into
+ // the start of string, and report the error
+ // from the initial quote character
+ tok->cur = (char *)tok->start;
+ tok->cur++;
+ tok->line_start = tok->multi_line_start;
+ int start = tok->lineno;
+ tok->lineno = tok->first_lineno;
+
+ if (INSIDE_FSTRING(tok)) {
+ /* When we are in an f-string, before raising the
+ * unterminated string literal error, check whether
+ * does the initial quote matches with f-strings quotes
+ * and if it is, then this must be a missing '}' token
+ * so raise the proper error */
+ tokenizer_mode *the_current_tok = TOK_GET_MODE(tok);
+ if (the_current_tok->f_string_quote == quote &&
+ the_current_tok->f_string_quote_size == quote_size) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: expecting '}'", start));
+ }
+ }
+
+ if (quote_size == 3) {
+ _PyTokenizer_syntaxerror(tok, "unterminated triple-quoted string literal"
+ " (detected at line %d)", start);
+ if (c != '\n') {
+ tok->done = E_EOFS;
+ }
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ else {
+ _PyTokenizer_syntaxerror(tok, "unterminated string literal (detected at"
+ " line %d)", start);
+ if (c != '\n') {
+ tok->done = E_EOLS;
+ }
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ if (c == quote) {
+ end_quote_size += 1;
+ }
+ else {
+ end_quote_size = 0;
+ if (c == '\\') {
+ c = tok_nextc(tok); /* skip escaped char */
+ if (c == '\r') {
+ c = tok_nextc(tok);
+ }
+ }
+ }
+ }
+
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(STRING);
+ }
+
+ /* Line continuation */
+ if (c == '\\') {
+ if ((c = tok_continuation_line(tok)) == -1) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ tok->cont_line = 1;
+ goto again; /* Read next line */
+ }
+
+ /* Punctuation character */
+ int is_punctuation = (c == ':' || c == '}' || c == '!' || c == '{');
+ if (is_punctuation && INSIDE_FSTRING(tok) && INSIDE_FSTRING_EXPR(current_tok)) {
+ /* This code block gets executed before the curly_bracket_depth is incremented
+ * by the `{` case, so for ensuring that we are on the 0th level, we need
+ * to adjust it manually */
+ int cursor = current_tok->curly_bracket_depth - (c != '{');
+ if (cursor == 0 && !_PyLexer_update_fstring_expr(tok, c)) {
+ return MAKE_TOKEN(ENDMARKER);
+ }
+ if (cursor == 0 && c != '{' && set_fstring_expr(tok, token, c)) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+
+ if (c == ':' && cursor == current_tok->curly_bracket_expr_start_depth) {
+ current_tok->kind = TOK_FSTRING_MODE;
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(_PyToken_OneChar(c));
+ }
+ }
+
+ /* Check for two-character token */
+ {
+ int c2 = tok_nextc(tok);
+ int current_token = _PyToken_TwoChars(c, c2);
+ if (current_token != OP) {
+ int c3 = tok_nextc(tok);
+ int current_token3 = _PyToken_ThreeChars(c, c2, c3);
+ if (current_token3 != OP) {
+ current_token = current_token3;
+ }
+ else {
+ tok_backup(tok, c3);
+ }
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(current_token);
+ }
+ tok_backup(tok, c2);
+ }
+
+ /* Keep track of parentheses nesting level */
+ switch (c) {
+ case '(':
+ case '[':
+ case '{':
+ if (tok->level >= MAXLEVEL) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "too many nested parentheses"));
+ }
+ tok->parenstack[tok->level] = c;
+ tok->parenlinenostack[tok->level] = tok->lineno;
+ tok->parencolstack[tok->level] = (int)(tok->start - tok->line_start);
+ tok->level++;
+ if (INSIDE_FSTRING(tok)) {
+ current_tok->curly_bracket_depth++;
+ }
+ break;
+ case ')':
+ case ']':
+ case '}':
+ if (INSIDE_FSTRING(tok) && !current_tok->curly_bracket_depth && c == '}') {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: single '}' is not allowed"));
+ }
+ if (!tok->tok_extra_tokens && !tok->level) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "unmatched '%c'", c));
+ }
+ if (tok->level > 0) {
+ tok->level--;
+ int opening = tok->parenstack[tok->level];
+ if (!tok->tok_extra_tokens && !((opening == '(' && c == ')') ||
+ (opening == '[' && c == ']') ||
+ (opening == '{' && c == '}'))) {
+ /* If the opening bracket belongs to an f-string's expression
+ part (e.g. f"{)}") and the closing bracket is an arbitrary
+ nested expression, then instead of matching a different
+ syntactical construct with it; we'll throw an unmatched
+ parentheses error. */
+ if (INSIDE_FSTRING(tok) && opening == '{') {
+ assert(current_tok->curly_bracket_depth >= 0);
+ int previous_bracket = current_tok->curly_bracket_depth - 1;
+ if (previous_bracket == current_tok->curly_bracket_expr_start_depth) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: unmatched '%c'", c));
+ }
+ }
+ if (tok->parenlinenostack[tok->level] != tok->lineno) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "closing parenthesis '%c' does not match "
+ "opening parenthesis '%c' on line %d",
+ c, opening, tok->parenlinenostack[tok->level]));
+ }
+ else {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "closing parenthesis '%c' does not match "
+ "opening parenthesis '%c'",
+ c, opening));
+ }
+ }
+ }
+
+ if (INSIDE_FSTRING(tok)) {
+ current_tok->curly_bracket_depth--;
+ if (c == '}' && current_tok->curly_bracket_depth == current_tok->curly_bracket_expr_start_depth) {
+ current_tok->curly_bracket_expr_start_depth--;
+ current_tok->kind = TOK_FSTRING_MODE;
+ current_tok->f_string_debug = 0;
+ }
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (!Py_UNICODE_ISPRINTABLE(c)) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "invalid non-printable character U+%04X", c));
+ }
+
+ if( c == '=' && INSIDE_FSTRING_EXPR(current_tok)) {
+ current_tok->f_string_debug = 1;
+ }
+
+ /* Punctuation character */
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(_PyToken_OneChar(c));
+}
+
+static int
+tok_get_fstring_mode(struct tok_state *tok, tokenizer_mode* current_tok, struct token *token)
+{
+ const char *p_start = NULL;
+ const char *p_end = NULL;
+ int end_quote_size = 0;
+ int unicode_escape = 0;
+
+ tok->start = tok->cur;
+ tok->first_lineno = tok->lineno;
+ tok->starting_col_offset = tok->col_offset;
+
+ // If we start with a bracket, we defer to the normal mode as there is nothing for us to tokenize
+ // before it.
+ int start_char = tok_nextc(tok);
+ if (start_char == '{') {
+ int peek1 = tok_nextc(tok);
+ tok_backup(tok, peek1);
+ tok_backup(tok, start_char);
+ if (peek1 != '{') {
+ current_tok->curly_bracket_expr_start_depth++;
+ if (current_tok->curly_bracket_expr_start_depth >= MAX_EXPR_NESTING) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: expressions nested too deeply"));
+ }
+ TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
+ return tok_get_normal_mode(tok, current_tok, token);
+ }
+ }
+ else {
+ tok_backup(tok, start_char);
+ }
+
+ // Check if we are at the end of the string
+ for (int i = 0; i < current_tok->f_string_quote_size; i++) {
+ int quote = tok_nextc(tok);
+ if (quote != current_tok->f_string_quote) {
+ tok_backup(tok, quote);
+ goto f_string_middle;
+ }
+ }
+
+ if (current_tok->last_expr_buffer != NULL) {
+ PyMem_Free(current_tok->last_expr_buffer);
+ current_tok->last_expr_buffer = NULL;
+ current_tok->last_expr_size = 0;
+ current_tok->last_expr_end = -1;
+ }
+
+ p_start = tok->start;
+ p_end = tok->cur;
+ tok->tok_mode_stack_index--;
+ return MAKE_TOKEN(FSTRING_END);
+
+f_string_middle:
+
+ // TODO: This is a bit of a hack, but it works for now. We need to find a better way to handle
+ // this.
+ tok->multi_line_start = tok->line_start;
+ while (end_quote_size != current_tok->f_string_quote_size) {
+ int c = tok_nextc(tok);
+ if (tok->done == E_ERROR) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ int in_format_spec = (
+ current_tok->last_expr_end != -1
+ &&
+ INSIDE_FSTRING_EXPR(current_tok)
+ );
+
+ if (c == EOF || (current_tok->f_string_quote_size == 1 && c == '\n')) {
+ if (tok->decoding_erred) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+
+ // If we are in a format spec and we found a newline,
+ // it means that the format spec ends here and we should
+ // return to the regular mode.
+ if (in_format_spec && c == '\n') {
+ tok_backup(tok, c);
+ TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(FSTRING_MIDDLE);
+ }
+
+ assert(tok->multi_line_start != NULL);
+ // shift the tok_state's location into
+ // the start of string, and report the error
+ // from the initial quote character
+ tok->cur = (char *)current_tok->f_string_start;
+ tok->cur++;
+ tok->line_start = current_tok->f_string_multi_line_start;
+ int start = tok->lineno;
+
+ tokenizer_mode *the_current_tok = TOK_GET_MODE(tok);
+ tok->lineno = the_current_tok->f_string_line_start;
+
+ if (current_tok->f_string_quote_size == 3) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "unterminated triple-quoted f-string literal"
+ " (detected at line %d)", start));
+ }
+ else {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok,
+ "unterminated f-string literal (detected at"
+ " line %d)", start));
+ }
+ }
+
+ if (c == current_tok->f_string_quote) {
+ end_quote_size += 1;
+ continue;
+ } else {
+ end_quote_size = 0;
+ }
+
+ if (c == '{') {
+ int peek = tok_nextc(tok);
+ if (peek != '{' || in_format_spec) {
+ tok_backup(tok, peek);
+ tok_backup(tok, c);
+ current_tok->curly_bracket_expr_start_depth++;
+ if (current_tok->curly_bracket_expr_start_depth >= MAX_EXPR_NESTING) {
+ return MAKE_TOKEN(_PyTokenizer_syntaxerror(tok, "f-string: expressions nested too deeply"));
+ }
+ TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
+ p_start = tok->start;
+ p_end = tok->cur;
+ } else {
+ p_start = tok->start;
+ p_end = tok->cur - 1;
+ }
+ return MAKE_TOKEN(FSTRING_MIDDLE);
+ } else if (c == '}') {
+ if (unicode_escape) {
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(FSTRING_MIDDLE);
+ }
+ int peek = tok_nextc(tok);
+
+ // The tokenizer can only be in the format spec if we have already completed the expression
+ // scanning (indicated by the end of the expression being set) and we are not at the top level
+ // of the bracket stack (-1 is the top level). Since format specifiers can't legally use double
+ // brackets, we can bypass it here.
+ if (peek == '}' && !in_format_spec) {
+ p_start = tok->start;
+ p_end = tok->cur - 1;
+ } else {
+ tok_backup(tok, peek);
+ tok_backup(tok, c);
+ TOK_GET_MODE(tok)->kind = TOK_REGULAR_MODE;
+ p_start = tok->start;
+ p_end = tok->cur;
+ }
+ return MAKE_TOKEN(FSTRING_MIDDLE);
+ } else if (c == '\\') {
+ int peek = tok_nextc(tok);
+ if (peek == '\r') {
+ peek = tok_nextc(tok);
+ }
+ // Special case when the backslash is right before a curly
+ // brace. We have to restore and return the control back
+ // to the loop for the next iteration.
+ if (peek == '{' || peek == '}') {
+ if (!current_tok->f_string_raw) {
+ if (_PyTokenizer_warn_invalid_escape_sequence(tok, peek)) {
+ return MAKE_TOKEN(ERRORTOKEN);
+ }
+ }
+ tok_backup(tok, peek);
+ continue;
+ }
+
+ if (!current_tok->f_string_raw) {
+ if (peek == 'N') {
+ /* Handle named unicode escapes (\N{BULLET}) */
+ peek = tok_nextc(tok);
+ if (peek == '{') {
+ unicode_escape = 1;
+ } else {
+ tok_backup(tok, peek);
+ }
+ }
+ } /* else {
+ skip the escaped character
+ }*/
+ }
+ }
+
+ // Backup the f-string quotes to emit a final FSTRING_MIDDLE and
+ // add the quotes to the FSTRING_END in the next tokenizer iteration.
+ for (int i = 0; i < current_tok->f_string_quote_size; i++) {
+ tok_backup(tok, current_tok->f_string_quote);
+ }
+ p_start = tok->start;
+ p_end = tok->cur;
+ return MAKE_TOKEN(FSTRING_MIDDLE);
+}
+
+static int
+tok_get(struct tok_state *tok, struct token *token)
+{
+ tokenizer_mode *current_tok = TOK_GET_MODE(tok);
+ if (current_tok->kind == TOK_REGULAR_MODE) {
+ return tok_get_normal_mode(tok, current_tok, token);
+ } else {
+ return tok_get_fstring_mode(tok, current_tok, token);
+ }
+}
+
+int
+_PyTokenizer_Get(struct tok_state *tok, struct token *token)
+{
+ int result = tok_get(tok, token);
+ if (tok->decoding_erred) {
+ result = ERRORTOKEN;
+ tok->done = E_DECODE;
+ }
+ return result;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-06-05 12:15:06 +0000