Ticket #200 (new enhancement)

Opened 4 years ago

Last modified 13 months ago

should produce cleaner error message when processing documents containing tabs

Reported by: liu.long@… Owned by: xi
Priority: normal Component: pyyaml-legacy
Severity: normal Keywords: tab


I am facing a problem while trying to execute a program taking YAML documents as input, and get the following error message (This error occurs when libyaml finds unparsable yaml files, in this case a Tab character used for indenting.):

The error is thrown in the 7th line as: Error: YAML syntax error - found character that cannot start any token while scanning for the next token, at line 7

Instead, I need some message like this: Error: YAML syntax error - found a tab character where intendation spaces are expected while scanning for the next token, at line 7

Tab errors, as far as I know, is very common in YAML documents, it will help a lot. In fact, the problem is very easy to fix, just add a few lines in scanner.c, line 1041:

/* Is it a tab? */
if (CHECK(parser->buffer, '\t'))
    return yaml_parser_set_scanner_error(parser,
    	    "while scanning for the next token", parser->mark,
	    "found a tab character where intendation spaces are expected");

Change History

comment:1 Changed 4 years ago by anonymous

  • Owner changed from liu.long@… to xi

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comment:11 Changed 14 months ago by GustavoOl

  • Component changed from libyaml to pyyaml-legacy

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comment:16 Changed 13 months ago by liwa <dirosie46@…>

The second issue is that the emitter escapes non-ASCII characters even when all characters are printable (according to 'c-printable' in the YAML spec) when using an encoding (UTF8) that supports such characters. I don't find this as elegant as could be. Instead of the "Fran\xE7ais" output above, I would have hoped for the UTF8-encoded byte string Fran\xc3\xa7ais\n.

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