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py/lexer: Simplify handling of line-continuation error. 

Previous to this patch there was an explicit check for errors with line
continuation (where backslash was not immediately followed by a newline).

But this check is not necessary: if there is an error then the remaining
logic of the tokeniser will reject the backslash and correctly produce a
syntax error.
pull/1/head
Damien George 2017-02-17 11:30:14 +11:00
parent ae43679792
commit 773278ec30
2 changed files with 9 additions and 18 deletions
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14
py/lexer.c
View File

@ -290,18 +290,10 @@ void mp_lexer_to_next(mp_lexer_t *lex) {
next_char(lex);
}
// had_physical_newline will be set on next loop
} else if (is_char(lex, '\\')) {
// backslash (outside string literals) must appear just before a physical newline
} else if (is_char_and(lex, '\\', '\n')) {
// line-continuation, so don't set had_physical_newline
next_char(lex);
next_char(lex);
if (!is_physical_newline(lex)) {
// SyntaxError: unexpected character after line continuation character
lex->tok_line = lex->line;
lex->tok_column = lex->column;
lex->tok_kind = MP_TOKEN_BAD_LINE_CONTINUATION;
return;
} else {
next_char(lex);
}
} else {
break;
}

13
py/lexer.h
View File

@ -39,18 +39,17 @@
*/
typedef enum _mp_token_kind_t {
MP_TOKEN_END, // 0
MP_TOKEN_END,
MP_TOKEN_INVALID,
MP_TOKEN_DEDENT_MISMATCH,
MP_TOKEN_LONELY_STRING_OPEN,
MP_TOKEN_BAD_LINE_CONTINUATION,
MP_TOKEN_NEWLINE, // 5
MP_TOKEN_INDENT, // 6
MP_TOKEN_DEDENT, // 7
MP_TOKEN_NEWLINE,
MP_TOKEN_INDENT,
MP_TOKEN_DEDENT,
MP_TOKEN_NAME, // 8
MP_TOKEN_NAME,
MP_TOKEN_INTEGER,
MP_TOKEN_FLOAT_OR_IMAG,
MP_TOKEN_STRING,
@ -58,7 +57,7 @@ typedef enum _mp_token_kind_t {
MP_TOKEN_ELLIPSIS,
MP_TOKEN_KW_FALSE, // 14
MP_TOKEN_KW_FALSE,
MP_TOKEN_KW_NONE,
MP_TOKEN_KW_TRUE,
MP_TOKEN_KW___DEBUG__,