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py: Convert CR to LF and CR LF to LF in lexer. 

Only noticeable difference is how newlines are encoded in triple-quoted
strings.  The behaviour now matches CPython3.
This commit is contained in:
Damien George 2015-01-30 00:27:46 +00:00
parent 3da677e658
commit 32bade19d9
3 changed files with 33 additions and 23 deletions
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51
py/lexer.c
View File

@ -55,7 +55,7 @@ STATIC bool is_end(mp_lexer_t *lex) {
}
STATIC bool is_physical_newline(mp_lexer_t *lex) {
return lex->chr0 == '\n' || lex->chr0 == '\r';
return lex->chr0 == '\n';
}
STATIC bool is_char(mp_lexer_t *lex, char c) {
@ -123,20 +123,10 @@ STATIC void next_char(mp_lexer_t *lex) {
return;
}
mp_uint_t advance = 1;
if (lex->chr0 == '\n') {
// LF is a new line
// a new line
++lex->line;
lex->column = 1;
} else if (lex->chr0 == '\r') {
// CR is a new line
++lex->line;
lex->column = 1;
if (lex->chr1 == '\n') {
// CR LF is a single new line
advance = 2;
}
} else if (lex->chr0 == '\t') {
// a tab
lex->column = (((lex->column - 1 + TAB_SIZE) / TAB_SIZE) * TAB_SIZE) + 1;
@ -145,15 +135,26 @@ STATIC void next_char(mp_lexer_t *lex) {
++lex->column;
}
for (; advance > 0; advance--) {
lex->chr0 = lex->chr1;
lex->chr1 = lex->chr2;
lex->chr2 = lex->stream_next_byte(lex->stream_data);
if (lex->chr2 == MP_LEXER_EOF) {
// EOF
if (lex->chr1 != MP_LEXER_EOF && lex->chr1 != '\n' && lex->chr1 != '\r') {
lex->chr2 = '\n'; // insert newline at end of file
}
lex->chr0 = lex->chr1;
lex->chr1 = lex->chr2;
lex->chr2 = lex->stream_next_byte(lex->stream_data);
if (lex->chr0 == '\r') {
// CR is a new line, converted to LF
lex->chr0 = '\n';
if (lex->chr1 == '\n') {
// CR LF is a single new line
lex->chr1 = lex->chr2;
lex->chr2 = lex->stream_next_byte(lex->stream_data);
}
}
if (lex->chr2 == MP_LEXER_EOF) {
// EOF, check if we need to insert a newline at end of file
if (lex->chr1 != MP_LEXER_EOF && lex->chr1 != '\n') {
// if lex->chr1 == '\r' then this makes a CR LF which will be converted to LF above
// otherwise it just inserts a LF
lex->chr2 = '\n';
}
}
}
@ -721,11 +722,15 @@ mp_lexer_t *mp_lexer_new(qstr src_name, void *stream_data, mp_lexer_stream_next_
if (lex->chr0 == MP_LEXER_EOF) {
lex->chr0 = '\n';
} else if (lex->chr1 == MP_LEXER_EOF) {
if (lex->chr0 != '\n' && lex->chr0 != '\r') {
if (lex->chr0 == '\r') {
lex->chr0 = '\n';
} else if (lex->chr0 != '\n') {
lex->chr1 = '\n';
}
} else if (lex->chr2 == MP_LEXER_EOF) {
if (lex->chr1 != '\n' && lex->chr1 != '\r') {
if (lex->chr1 == '\r') {
lex->chr1 = '\n';
} else if (lex->chr1 != '\n') {
lex->chr2 = '\n';
}
}

1
tests/basics/string_cr_conversion.py Normal file
View File

@ -0,0 +1 @@
# this file has CR line endings to test lexer's conversion of them to LF # in triple quoted strings print(repr("""abc def"""))

4
tests/basics/string_crlf_conversion.py Normal file
View File

@ -0,0 +1,4 @@
# this file has CRLF line endings to test lexer's conversion of them to LF
# in triple quoted strings
print(repr("""abc
def"""))