688 lines
21 KiB
C
688 lines
21 KiB
C
/* lexer.c -- simple tokeniser for Python implementation
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <assert.h>
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#include "misc.h"
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#include "lexer.h"
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#define TAB_SIZE (8)
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// TODO seems that CPython allows NULL byte in the input stream
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// don't know if that's intentional or not, but we don't allow it
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struct _mp_lexer_t {
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const char *name; // name of source
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void *stream_data; // data for stream
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mp_lexer_stream_next_char_t stream_next_char; // stream callback to get next char
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mp_lexer_stream_close_t stream_close; // stream callback to free
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unichar chr0, chr1, chr2; // current cached characters from source
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uint line; // source line
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uint column; // source column
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int emit_dent; // non-zero when there are INDENT/DEDENT tokens to emit
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int nested_bracket_level; // >0 when there are nested brackets over multiple lines
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uint alloc_indent_level;
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uint num_indent_level;
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uint16_t *indent_level;
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vstr_t vstr;
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mp_token_t tok_cur;
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};
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bool str_strn_equal(const char *str, const char *strn, int len) {
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uint i = 0;
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while (i < len && *str == *strn) {
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++i;
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++str;
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++strn;
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}
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return i == len && *str == 0;
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}
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void mp_token_show(const mp_token_t *tok) {
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printf("(%s:%d:%d) kind:%d str:%p len:%d", tok->src_name, tok->src_line, tok->src_column, tok->kind, tok->str, tok->len);
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if (tok->str != NULL && tok->len > 0) {
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const char *i = tok->str;
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const char *j = i + tok->len;
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printf(" ");
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while (i < j) {
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unichar c = utf8_get_char(i);
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i = utf8_next_char(i);
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if (unichar_isprint(c)) {
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printf("%c", c);
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} else {
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printf("?");
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}
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}
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}
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printf("\n");
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}
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void mp_token_show_error_prefix(const mp_token_t *tok) {
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printf("(%s:%d:%d) ", tok->src_name, tok->src_line, tok->src_column);
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}
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bool mp_token_show_error(const mp_token_t *tok, const char *msg) {
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printf("(%s:%d:%d) %s\n", tok->src_name, tok->src_line, tok->src_column, msg);
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return false;
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}
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#define CUR_CHAR(lex) ((lex)->chr0)
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static bool is_end(mp_lexer_t *lex) {
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return lex->chr0 == MP_LEXER_CHAR_EOF;
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}
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static bool is_physical_newline(mp_lexer_t *lex) {
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return lex->chr0 == '\n' || lex->chr0 == '\r';
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}
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static bool is_char(mp_lexer_t *lex, char c) {
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return lex->chr0 == c;
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}
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static bool is_char_or(mp_lexer_t *lex, char c1, char c2) {
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return lex->chr0 == c1 || lex->chr0 == c2;
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}
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static bool is_char_or3(mp_lexer_t *lex, char c1, char c2, char c3) {
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return lex->chr0 == c1 || lex->chr0 == c2 || lex->chr0 == c3;
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}
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/*
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static bool is_char_following(mp_lexer_t *lex, char c) {
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return lex->chr1 == c;
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}
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*/
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static bool is_char_following_or(mp_lexer_t *lex, char c1, char c2) {
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return lex->chr1 == c1 || lex->chr1 == c2;
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}
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static bool is_char_following_following_or(mp_lexer_t *lex, char c1, char c2) {
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return lex->chr2 == c1 || lex->chr2 == c2;
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}
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static bool is_char_and(mp_lexer_t *lex, char c1, char c2) {
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return lex->chr0 == c1 && lex->chr1 == c2;
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}
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static bool is_whitespace(mp_lexer_t *lex) {
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return unichar_isspace(lex->chr0);
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}
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static bool is_letter(mp_lexer_t *lex) {
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return unichar_isalpha(lex->chr0);
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}
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static bool is_digit(mp_lexer_t *lex) {
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return unichar_isdigit(lex->chr0);
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}
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static bool is_following_digit(mp_lexer_t *lex) {
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return unichar_isdigit(lex->chr1);
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}
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// TODO UNICODE include unicode characters in definition of identifiers
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static bool is_head_of_identifier(mp_lexer_t *lex) {
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return is_letter(lex) || lex->chr0 == '_';
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}
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// TODO UNICODE include unicode characters in definition of identifiers
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static bool is_tail_of_identifier(mp_lexer_t *lex) {
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return is_head_of_identifier(lex) || is_digit(lex);
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}
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static void next_char(mp_lexer_t *lex) {
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if (lex->chr0 == MP_LEXER_CHAR_EOF) {
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return;
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}
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int advance = 1;
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if (lex->chr0 == '\n') {
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// LF is a new line
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++lex->line;
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lex->column = 1;
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} else if (lex->chr0 == '\r') {
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// CR is a new line
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++lex->line;
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lex->column = 1;
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if (lex->chr1 == '\n') {
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// CR LF is a single new line
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advance = 2;
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}
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} else if (lex->chr0 == '\t') {
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// a tab
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lex->column = (((lex->column - 1 + TAB_SIZE) / TAB_SIZE) * TAB_SIZE) + 1;
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} else {
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// a character worth one column
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++lex->column;
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}
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for (; advance > 0; advance--) {
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lex->chr0 = lex->chr1;
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lex->chr1 = lex->chr2;
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lex->chr2 = lex->stream_next_char(lex->stream_data);
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if (lex->chr2 == MP_LEXER_CHAR_EOF) {
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// EOF
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if (lex->chr1 != MP_LEXER_CHAR_EOF && lex->chr1 != '\n' && lex->chr1 != '\r') {
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lex->chr2 = '\n'; // insert newline at end of file
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}
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}
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}
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}
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void indent_push(mp_lexer_t *lex, uint indent) {
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if (lex->num_indent_level >= lex->alloc_indent_level) {
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lex->indent_level = m_renew(uint16_t, lex->indent_level, lex->alloc_indent_level, lex->alloc_indent_level * 2);
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lex->alloc_indent_level *= 2;
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}
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lex->indent_level[lex->num_indent_level++] = indent;
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}
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uint indent_top(mp_lexer_t *lex) {
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return lex->indent_level[lex->num_indent_level - 1];
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}
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void indent_pop(mp_lexer_t *lex) {
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lex->num_indent_level -= 1;
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}
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// some tricky operator encoding:
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// <op> = begin with <op>, if this opchar matches then begin here
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// e<op> = end with <op>, if this opchar matches then end
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// E<op> = mandatory end with <op>, this opchar must match, then end
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// c<op> = continue with <op>, if this opchar matches then continue matching
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// this means if the start of two ops are the same then they are equal til the last char
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static const char *tok_enc =
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"()[]{},:;@~" // singles
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"<e=c<e=" // < <= << <<=
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">e=c>e=" // > >= >> >>=
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"*e=c*e=" // * *= ** **=
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"+e=" // + +=
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"-e=e>" // - -= ->
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"&e=" // & &=
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"|e=" // | |=
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"/e=c/e=" // / /= // //=
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"%e=" // % %=
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"^e=" // ^ ^=
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"=e=" // = ==
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"!E=" // !=
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".c.E."; // . ...
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// TODO static assert that number of tokens is less than 256 so we can safely make this table with byte sized entries
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static const uint8_t tok_enc_kind[] = {
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MP_TOKEN_DEL_PAREN_OPEN, MP_TOKEN_DEL_PAREN_CLOSE,
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MP_TOKEN_DEL_BRACKET_OPEN, MP_TOKEN_DEL_BRACKET_CLOSE,
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MP_TOKEN_DEL_BRACE_OPEN, MP_TOKEN_DEL_BRACE_CLOSE,
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MP_TOKEN_DEL_COMMA, MP_TOKEN_DEL_COLON, MP_TOKEN_DEL_SEMICOLON, MP_TOKEN_DEL_AT, MP_TOKEN_OP_TILDE,
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MP_TOKEN_OP_LESS, MP_TOKEN_OP_LESS_EQUAL, MP_TOKEN_OP_DBL_LESS, MP_TOKEN_DEL_DBL_LESS_EQUAL,
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MP_TOKEN_OP_MORE, MP_TOKEN_OP_MORE_EQUAL, MP_TOKEN_OP_DBL_MORE, MP_TOKEN_DEL_DBL_MORE_EQUAL,
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MP_TOKEN_OP_STAR, MP_TOKEN_DEL_STAR_EQUAL, MP_TOKEN_OP_DBL_STAR, MP_TOKEN_DEL_DBL_STAR_EQUAL,
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MP_TOKEN_OP_PLUS, MP_TOKEN_DEL_PLUS_EQUAL,
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MP_TOKEN_OP_MINUS, MP_TOKEN_DEL_MINUS_EQUAL, MP_TOKEN_DEL_MINUS_MORE,
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MP_TOKEN_OP_AMPERSAND, MP_TOKEN_DEL_AMPERSAND_EQUAL,
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MP_TOKEN_OP_PIPE, MP_TOKEN_DEL_PIPE_EQUAL,
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MP_TOKEN_OP_SLASH, MP_TOKEN_DEL_SLASH_EQUAL, MP_TOKEN_OP_DBL_SLASH, MP_TOKEN_DEL_DBL_SLASH_EQUAL,
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MP_TOKEN_OP_PERCENT, MP_TOKEN_DEL_PERCENT_EQUAL,
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MP_TOKEN_OP_CARET, MP_TOKEN_DEL_CARET_EQUAL,
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MP_TOKEN_DEL_EQUAL, MP_TOKEN_OP_DBL_EQUAL,
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MP_TOKEN_OP_NOT_EQUAL,
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MP_TOKEN_DEL_PERIOD, MP_TOKEN_ELLIPSIS,
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};
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// must have the same order as enum in lexer.h
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static const char *tok_kw[] = {
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"False",
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"None",
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"True",
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"and",
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"as",
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"assert",
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"break",
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"class",
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"continue",
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"def",
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"del",
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"elif",
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"else",
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"except",
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"finally",
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"for",
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"from",
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"global",
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"if",
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"import",
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"in",
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"is",
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"lambda",
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"nonlocal",
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"not",
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"or",
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"pass",
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"raise",
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"return",
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"try",
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"while",
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"with",
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"yield",
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NULL,
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};
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static void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool first_token) {
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// skip white space and comments
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bool had_physical_newline = false;
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while (!is_end(lex)) {
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if (is_physical_newline(lex)) {
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had_physical_newline = true;
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next_char(lex);
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} else if (is_whitespace(lex)) {
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next_char(lex);
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} else if (is_char(lex, '#')) {
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next_char(lex);
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while (!is_end(lex) && !is_physical_newline(lex)) {
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next_char(lex);
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}
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// had_physical_newline will be set on next loop
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} else if (is_char(lex, '\\')) {
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// backslash (outside string literals) must appear just before a physical newline
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next_char(lex);
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if (!is_physical_newline(lex)) {
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// TODO SyntaxError
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assert(0);
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} else {
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next_char(lex);
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}
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} else {
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break;
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}
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}
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// set token source information
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tok->src_name = lex->name;
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tok->src_line = lex->line;
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tok->src_column = lex->column;
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// start new token text
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vstr_reset(&lex->vstr);
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if (first_token && lex->line == 1 && lex->column != 1) {
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// check that the first token is in the first column
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// if first token is not on first line, we get a physical newline and
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// this check is done as part of normal indent/dedent checking below
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// (done to get equivalence with CPython)
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tok->kind = MP_TOKEN_INDENT;
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} else if (lex->emit_dent < 0) {
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tok->kind = MP_TOKEN_DEDENT;
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lex->emit_dent += 1;
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} else if (lex->emit_dent > 0) {
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tok->kind = MP_TOKEN_INDENT;
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lex->emit_dent -= 1;
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} else if (had_physical_newline && lex->nested_bracket_level == 0) {
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tok->kind = MP_TOKEN_NEWLINE;
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uint num_spaces = lex->column - 1;
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lex->emit_dent = 0;
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if (num_spaces == indent_top(lex)) {
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} else if (num_spaces > indent_top(lex)) {
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indent_push(lex, num_spaces);
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lex->emit_dent += 1;
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} else {
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while (num_spaces < indent_top(lex)) {
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indent_pop(lex);
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lex->emit_dent -= 1;
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}
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if (num_spaces != indent_top(lex)) {
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tok->kind = MP_TOKEN_DEDENT_MISMATCH;
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}
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}
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} else if (is_end(lex)) {
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if (indent_top(lex) > 0) {
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tok->kind = MP_TOKEN_NEWLINE;
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lex->emit_dent = 0;
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while (indent_top(lex) > 0) {
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indent_pop(lex);
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lex->emit_dent -= 1;
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}
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} else {
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tok->kind = MP_TOKEN_END;
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}
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} else if (is_char_or(lex, '\'', '\"')
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|| (is_char_or3(lex, 'r', 'u', 'b') && is_char_following_or(lex, '\'', '\"'))
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|| ((is_char_and(lex, 'r', 'b') || is_char_and(lex, 'b', 'r')) && is_char_following_following_or(lex, '\'', '\"'))) {
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// a string or bytes literal
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// parse type codes
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bool is_raw = false;
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bool is_bytes = false;
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if (is_char(lex, 'u')) {
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next_char(lex);
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} else if (is_char(lex, 'b')) {
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is_bytes = true;
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next_char(lex);
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if (is_char(lex, 'r')) {
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is_raw = true;
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next_char(lex);
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}
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} else if (is_char(lex, 'r')) {
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is_raw = true;
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next_char(lex);
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if (is_char(lex, 'b')) {
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is_bytes = true;
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next_char(lex);
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}
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}
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// set token kind
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if (is_bytes) {
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tok->kind = MP_TOKEN_BYTES;
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} else {
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tok->kind = MP_TOKEN_STRING;
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}
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// get first quoting character
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char quote_char = '\'';
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if (is_char(lex, '\"')) {
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quote_char = '\"';
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}
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next_char(lex);
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// work out if it's a single or triple quoted literal
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int num_quotes;
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if (is_char_and(lex, quote_char, quote_char)) {
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// triple quotes
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next_char(lex);
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next_char(lex);
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num_quotes = 3;
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} else {
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// single quotes
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num_quotes = 1;
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}
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// parse the literal
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int n_closing = 0;
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while (!is_end(lex) && (num_quotes > 1 || !is_char(lex, '\n')) && n_closing < num_quotes) {
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if (is_char(lex, quote_char)) {
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n_closing += 1;
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vstr_add_char(&lex->vstr, CUR_CHAR(lex));
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} else {
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n_closing = 0;
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if (!is_raw && is_char(lex, '\\')) {
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next_char(lex);
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unichar c = CUR_CHAR(lex);
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switch (c) {
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case MP_LEXER_CHAR_EOF: break; // TODO a proper error message?
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case '\n': c = MP_LEXER_CHAR_EOF; break; // TODO check this works correctly (we are supposed to ignore it
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case '\\': break;
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case '\'': break;
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case '"': break;
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case 'a': c = 0x07; break;
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case 'b': c = 0x08; break;
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case 't': c = 0x09; break;
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case 'n': c = 0x0a; break;
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case 'v': c = 0x0b; break;
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case 'f': c = 0x0c; break;
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case 'r': c = 0x0d; break;
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// TODO \ooo octal
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case 'x': // TODO \xhh
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case 'N': // TODO \N{name} only in strings
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case 'u': // TODO \uxxxx only in strings
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case 'U': // TODO \Uxxxxxxxx only in strings
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default: break; // TODO error message
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}
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if (c != MP_LEXER_CHAR_EOF) {
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vstr_add_char(&lex->vstr, c);
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}
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} else {
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vstr_add_char(&lex->vstr, CUR_CHAR(lex));
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}
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}
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next_char(lex);
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}
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// check we got the required end quotes
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if (n_closing < num_quotes) {
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tok->kind = MP_TOKEN_LONELY_STRING_OPEN;
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}
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// cut off the end quotes from the token text
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vstr_cut_tail(&lex->vstr, n_closing);
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} else if (is_head_of_identifier(lex)) {
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tok->kind = MP_TOKEN_NAME;
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// get first char
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vstr_add_char(&lex->vstr, CUR_CHAR(lex));
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next_char(lex);
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// get tail chars
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while (!is_end(lex) && is_tail_of_identifier(lex)) {
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vstr_add_char(&lex->vstr, CUR_CHAR(lex));
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next_char(lex);
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}
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} else if (is_digit(lex) || (is_char(lex, '.') && is_following_digit(lex))) {
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tok->kind = MP_TOKEN_NUMBER;
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// get first char
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vstr_add_char(&lex->vstr, CUR_CHAR(lex));
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next_char(lex);
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// get tail chars
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while (!is_end(lex)) {
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if (is_char_or(lex, 'e', 'E')) {
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vstr_add_char(&lex->vstr, 'e');
|
|
next_char(lex);
|
|
if (is_char(lex, '+') || is_char(lex, '-')) {
|
|
vstr_add_char(&lex->vstr, CUR_CHAR(lex));
|
|
next_char(lex);
|
|
}
|
|
} else if (is_letter(lex) || is_digit(lex) || is_char_or(lex, '_', '.')) {
|
|
vstr_add_char(&lex->vstr, CUR_CHAR(lex));
|
|
next_char(lex);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
// search for encoded delimiter or operator
|
|
|
|
const char *t = tok_enc;
|
|
uint tok_enc_index = 0;
|
|
for (; *t != 0 && !is_char(lex, *t); t += 1) {
|
|
if (*t == 'e' || *t == 'c') {
|
|
t += 1;
|
|
} else if (*t == 'E') {
|
|
tok_enc_index -= 1;
|
|
t += 1;
|
|
}
|
|
tok_enc_index += 1;
|
|
}
|
|
|
|
next_char(lex);
|
|
|
|
if (*t == 0) {
|
|
// didn't match any delimiter or operator characters
|
|
tok->kind = MP_TOKEN_INVALID;
|
|
|
|
} else {
|
|
// matched a delimiter or operator character
|
|
|
|
// get the maximum characters for a valid token
|
|
t += 1;
|
|
uint t_index = tok_enc_index;
|
|
for (;;) {
|
|
for (; *t == 'e'; t += 1) {
|
|
t += 1;
|
|
t_index += 1;
|
|
if (is_char(lex, *t)) {
|
|
next_char(lex);
|
|
tok_enc_index = t_index;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (*t == 'E') {
|
|
t += 1;
|
|
if (is_char(lex, *t)) {
|
|
next_char(lex);
|
|
tok_enc_index = t_index;
|
|
} else {
|
|
tok->kind = MP_TOKEN_INVALID;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (*t == 'c') {
|
|
t += 1;
|
|
t_index += 1;
|
|
if (is_char(lex, *t)) {
|
|
next_char(lex);
|
|
tok_enc_index = t_index;
|
|
t += 1;
|
|
} else {
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// set token kind
|
|
tok->kind = tok_enc_kind[tok_enc_index];
|
|
|
|
// compute bracket level for implicit line joining
|
|
if (tok->kind == MP_TOKEN_DEL_PAREN_OPEN || tok->kind == MP_TOKEN_DEL_BRACKET_OPEN || tok->kind == MP_TOKEN_DEL_BRACE_OPEN) {
|
|
lex->nested_bracket_level += 1;
|
|
} else if (tok->kind == MP_TOKEN_DEL_PAREN_CLOSE || tok->kind == MP_TOKEN_DEL_BRACKET_CLOSE || tok->kind == MP_TOKEN_DEL_BRACE_CLOSE) {
|
|
lex->nested_bracket_level -= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// point token text to vstr buffer
|
|
tok->str = vstr_str(&lex->vstr);
|
|
tok->len = vstr_len(&lex->vstr);
|
|
|
|
// check for keywords
|
|
if (tok->kind == MP_TOKEN_NAME) {
|
|
for (int i = 0; tok_kw[i] != NULL; i++) {
|
|
if (str_strn_equal(tok_kw[i], tok->str, tok->len)) {
|
|
tok->kind = MP_TOKEN_KW_FALSE + i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
mp_lexer_t *mp_lexer_new(const char *src_name, void *stream_data, mp_lexer_stream_next_char_t stream_next_char, mp_lexer_stream_close_t stream_close) {
|
|
mp_lexer_t *lex = m_new(mp_lexer_t, 1);
|
|
|
|
lex->name = src_name; // TODO do we need to strdup this?
|
|
lex->stream_data = stream_data;
|
|
lex->stream_next_char = stream_next_char;
|
|
lex->stream_close = stream_close;
|
|
lex->line = 1;
|
|
lex->column = 1;
|
|
lex->emit_dent = 0;
|
|
lex->nested_bracket_level = 0;
|
|
lex->alloc_indent_level = 16;
|
|
lex->num_indent_level = 1;
|
|
lex->indent_level = m_new(uint16_t, lex->alloc_indent_level);
|
|
lex->indent_level[0] = 0;
|
|
vstr_init(&lex->vstr);
|
|
|
|
// preload characters
|
|
lex->chr0 = stream_next_char(stream_data);
|
|
lex->chr1 = stream_next_char(stream_data);
|
|
lex->chr2 = stream_next_char(stream_data);
|
|
|
|
// if input stream is 0, 1 or 2 characters long and doesn't end in a newline, then insert a newline at the end
|
|
if (lex->chr0 == MP_LEXER_CHAR_EOF) {
|
|
lex->chr0 = '\n';
|
|
} else if (lex->chr1 == MP_LEXER_CHAR_EOF) {
|
|
if (lex->chr0 != '\n' && lex->chr0 != '\r') {
|
|
lex->chr1 = '\n';
|
|
}
|
|
} else if (lex->chr2 == MP_LEXER_CHAR_EOF) {
|
|
if (lex->chr1 != '\n' && lex->chr1 != '\r') {
|
|
lex->chr2 = '\n';
|
|
}
|
|
}
|
|
|
|
// preload first token
|
|
mp_lexer_next_token_into(lex, &lex->tok_cur, true);
|
|
|
|
return lex;
|
|
}
|
|
|
|
void mp_lexer_free(mp_lexer_t *lex) {
|
|
if (lex) {
|
|
if (lex->stream_close) {
|
|
lex->stream_close(lex->stream_data);
|
|
}
|
|
vstr_clear(&lex->vstr);
|
|
m_del_obj(mp_lexer_t, lex);
|
|
}
|
|
}
|
|
|
|
void mp_lexer_to_next(mp_lexer_t *lex) {
|
|
mp_lexer_next_token_into(lex, &lex->tok_cur, false);
|
|
}
|
|
|
|
const mp_token_t *mp_lexer_cur(const mp_lexer_t *lex) {
|
|
return &lex->tok_cur;
|
|
}
|
|
|
|
bool mp_lexer_is_kind(mp_lexer_t *lex, mp_token_kind_t kind) {
|
|
return lex->tok_cur.kind == kind;
|
|
}
|
|
|
|
/*
|
|
bool mp_lexer_is_str(mp_lexer_t *lex, const char *str) {
|
|
return mp_token_is_str(&lex->tok_cur, str);
|
|
}
|
|
|
|
bool mp_lexer_opt_kind(mp_lexer_t *lex, mp_token_kind_t kind) {
|
|
if (mp_lexer_is_kind(lex, kind)) {
|
|
mp_lexer_to_next(lex);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool mp_lexer_opt_str(mp_lexer_t *lex, const char *str) {
|
|
if (mp_lexer_is_str(lex, str)) {
|
|
mp_lexer_to_next(lex);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
*/
|
|
|
|
bool mp_lexer_show_error(mp_lexer_t *lex, const char *msg) {
|
|
return mp_token_show_error(&lex->tok_cur, msg);
|
|
}
|
|
|
|
bool mp_lexer_show_error_pythonic(mp_lexer_t *lex, const char *msg) {
|
|
printf(" File \"%s\", line %d column %d\n%s\n", lex->tok_cur.src_name, lex->tok_cur.src_line, lex->tok_cur.src_column, msg);
|
|
return false;
|
|
}
|