字句解析器を読む
主要な構造体
/* Tokenizer state */
struct tok_state {
/* Input state; buf <= cur <= inp <= end */
/* NB an entire line is held in the buffer */
char *buf; /* Input buffer, or NULL; malloc'ed if fp != NULL */
char *cur; /* Next character in buffer */
char *inp; /* End of data in buffer */
char *end; /* End of input buffer if buf != NULL */
char *start; /* Start of current token if not NULL */
int done; /* E_OK normally, E_EOF at EOF, otherwise error code */
/* NB If done != E_OK, cur must be == inp!!! */
FILE *fp; /* Rest of input; NULL if tokenizing a string */
int tabsize; /* Tab spacing */
int indent; /* Current indentation index */
int indstack[MAXINDENT]; /* Stack of indents */
int atbol; /* Nonzero if at begin of new line */
int pendin; /* Pending indents (if > 0) or dedents (if < 0) */
const char *prompt, *nextprompt; /* For interactive prompting */
int lineno; /* Current line number */
int level; /* () [] {} Parentheses nesting level */
/* Used to allow free continuations inside them */
/* Stuff for checking on different tab sizes */
#ifndef PGEN
/* pgen doesn't have access to Python codecs, it cannot decode the input
filename. The bytes filename might be kept, but it is only used by
indenterror() and it is not really needed: pgen only compiles one file
(Grammar/Grammar). */
PyObject *filename;
#endif
int altindstack[MAXINDENT]; /* Stack of alternate indents */
/* Stuff for PEP 0263 */
enum decoding_state decoding_state;
int decoding_erred; /* whether erred in decoding */
int read_coding_spec; /* whether 'coding:...' has been read */
char *encoding; /* Source encoding. */
int cont_line; /* whether we are in a continuation line. */
const char* line_start; /* pointer to start of current line */
#ifndef PGEN
PyObject *decoding_readline; /* open(...).readline */
PyObject *decoding_buffer;
#endif
const char* enc; /* Encoding for the current str. */
const char* str;
const char* input; /* Tokenizer's newline translated copy of the string. */
};
主要な定数
/* Token types */
#ifndef Py_LIMITED_API
#ifndef Py_TOKEN_H
#define Py_TOKEN_H
#ifdef __cplusplus
extern "C" {
#endif
#undef TILDE /* Prevent clash of our definition with system macro. Ex AIX, ioctl.h */
#define ENDMARKER 0
#define NAME 1
#define NUMBER 2
#define STRING 3
#define NEWLINE 4
#define INDENT 5
#define DEDENT 6
#define LPAR 7
#define RPAR 8
#define LSQB 9
#define RSQB 10
#define COLON 11
#define COMMA 12
#define SEMI 13
#define PLUS 14
#define MINUS 15
#define STAR 16
#define SLASH 17
#define VBAR 18
#define AMPER 19
#define LESS 20
#define GREATER 21
#define EQUAL 22
#define DOT 23
#define PERCENT 24
#define LBRACE 25
#define RBRACE 26
#define EQEQUAL 27
#define NOTEQUAL 28
#define LESSEQUAL 29
#define GREATEREQUAL 30
#define TILDE 31
#define CIRCUMFLEX 32
#define LEFTSHIFT 33
#define RIGHTSHIFT 34
#define DOUBLESTAR 35
#define PLUSEQUAL 36
#define MINEQUAL 37
#define STAREQUAL 38
#define SLASHEQUAL 39
#define PERCENTEQUAL 40
#define AMPEREQUAL 41
#define VBAREQUAL 42
#define CIRCUMFLEXEQUAL 43
#define LEFTSHIFTEQUAL 44
#define RIGHTSHIFTEQUAL 45
#define DOUBLESTAREQUAL 46
#define DOUBLESLASH 47
#define DOUBLESLASHEQUAL 48
#define AT 49
#define ATEQUAL 50
#define RARROW 51
#define ELLIPSIS 52
/* Don't forget to update the table _PyParser_TokenNames in tokenizer.c! */
#define OP 53
#define ERRORTOKEN 54
/* These aren't used by the C tokenizer but are needed for tokenize.py */
#define COMMENT 55
#define NL 56
#define ENCODING 57
#define N_TOKENS 58
/* Special definitions for cooperation with parser */
#define NT_OFFSET 256
#define ISTERMINAL(x) ((x) < NT_OFFSET)
#define ISNONTERMINAL(x) ((x) >= NT_OFFSET)
#define ISEOF(x) ((x) == ENDMARKER)
PyAPI_DATA(const char *) _PyParser_TokenNames[]; /* Token names */
PyAPI_FUNC(int) PyToken_OneChar(int);
PyAPI_FUNC(int) PyToken_TwoChars(int, int);
PyAPI_FUNC(int) PyToken_ThreeChars(int, int, int);
#ifdef __cplusplus
}
#endif
#endif /* !Py_TOKEN_H */
#endif /* Py_LIMITED_API */
主要な変数
const char *_PyParser_TokenNames[] = {
"ENDMARKER",
"NAME",
"NUMBER",
"STRING",
"NEWLINE",
"INDENT",
"DEDENT",
"LPAR",
"RPAR",
"LSQB",
"RSQB",
"COLON",
"COMMA",
"SEMI",
"PLUS",
"MINUS",
"STAR",
"SLASH",
"VBAR",
"AMPER",
"LESS",
"GREATER",
"EQUAL",
"DOT",
"PERCENT",
"LBRACE",
"RBRACE",
"EQEQUAL",
"NOTEQUAL",
"LESSEQUAL",
"GREATEREQUAL",
"TILDE",
"CIRCUMFLEX",
"LEFTSHIFT",
"RIGHTSHIFT",
"DOUBLESTAR",
"PLUSEQUAL",
"MINEQUAL",
"STAREQUAL",
"SLASHEQUAL",
"PERCENTEQUAL",
"AMPEREQUAL",
"VBAREQUAL",
"CIRCUMFLEXEQUAL",
"LEFTSHIFTEQUAL",
"RIGHTSHIFTEQUAL",
"DOUBLESTAREQUAL",
"DOUBLESLASH",
"DOUBLESLASHEQUAL",
"AT",
"ATEQUAL",
"RARROW",
"ELLIPSIS",
/* This table must match the #defines in token.h! */
"OP",
"<ERRORTOKEN>",
"COMMENT",
"NL",
"ENCODING",
"<N_TOKENS>"
};