[Philadelphia-pm] My first stab at loading a YAML file - and how it blows up in my face

[Jacob Salomon <jakesalomon@yahoo.com>]

Hi Folks (capitalized!  ;-)

I'm a member of the ny.pm group, with Jim Keenan.  (Just for some identification)

In my most recent contract, the team leader (call him Steve) implemented a lot of great stuff using YAML files as a sort of registry for the applications.  So now I have the time to play with that stuff and try my own hand at it.  I'm using this book as a starting point:

YAML Ain’t Markup Language (YAML™)

Version 1.2

3rd Edition, Patched at 2009-10-01

Here's the YAML code I copy/pasted from one of the examples in the book:

--------------------------------------

  1 --- !<tag:clarkevans.com,2002:invoice>

  2 invoice: 34843

  3 date : 2001-01-23

  4 bill-to: &id001

  5   given : Chris

  6   family : Dumars

  7   address:

  8     lines: |

  9       458 Walkman Dr.

 10       Suite #292

 11     city : Royal Oak

 12     state : MI

 13     postal : 48046

 14 ship-to: *id001

 15 product:

 16   - sku : BL394D

 17     quantity : 4

 18     description : Basketball

 19     price : 450.00

 20   - sku : BL4438H

 21     quantity : 1

 22     description : Super Hoop

 23     price : 2392.00

 24 tax : 251.42

 25 total: 4443.52

 26 comments:

 27   Late afternoon is best.

 28   Backup contact is Nancy

 29   Billsmer @ 338-4338.

--------------------------------------

(I've tried to paste that in Courier font so that the indents stay consistent.)

Here is my Perl code:

----------------------------------------

 1 #!/usr/bin/perl -w -d

 2 # practice1.pl - My first practice yaml code

 3 #

 4 use strict;

 5 use YAML;

 6 use Data::Dumper;

 7

 8 my $yamfile = "./invoice.yaml";     # Play with this one firs

 9 my $yamlref = Load($yamfile);

10

11 1 == 1;     # Just a breakpoint

12 exit 0;

----------------------------------------

 (Again, I pasted that in Courier font.  But Yahoo mail is not always cooperative.)

And what happens when I issue that load call?

----------------------------------------

main::(./practice1.pl:9):       my $yamlref = Load($yamfile);

  DB<1> n

YAML Error: Expected separator '---'

   Code: YAML_PARSE_ERR_NO_SEPARATOR

   Line: 1

   Document: 2

 at /usr/share/perl5/YAML/Loader.pm line 78.

 at /usr/share/perl5/YAML/Mo.pm line 16.

        YAML::Mo::__ANON__[/usr/share/perl5/YAML/Mo.pm:17](YAML::Loader=HASH(0x1485c30), "YAML_PARSE_ERR_NO_SEPARATOR")

            called at /usr/share/perl5/YAML/Loader.pm line 78

        YAML::Loader::_parse(YAML::Loader=HASH(0x1485c30)) called at /usr/share/perl5/YAML/Loader.pm line 24

        YAML::Loader::load(YAML::Loader=HASH(0x1485c30), "./invoice.yaml") called at /usr/share/perl5/YAML.pm line 33

        YAML::Load("./invoice.yaml") called at ./practice1.pl line 9

Debugged program terminated.  Use q to quit or R to restart,

----------------------------------------

My searches have turned up lots of similar problems but no solution I could easily grok.  Can someone please point out what I'm doing wrong in the Yaml?  I may have pasted something incorrectly but the --- separator is there at the top.

BTW I have tried:

• Moving that <tag> to another line
• Commenting out that <tag> altogether
• Adding --- separator at the bottom of the YAML file
• Adding ... there instead of the ---

None of these fixed the "YAML_PARSE_ERR_NO_SEPARATOR" error.

I may post this on Perlmonks as well (I see it is addressed there) but I don't yet want to advertise my incompetence that widely. :-))

Thanks much for any help here.

+----- Jacob Salomon --------------------------------------------------+

| The first lesson of economics is scarcity: there is never enough of  |

| anything to fully satisfy all those who want it. The first lesson of |

| politics is to disregard the first lesson of economics.              |

+------------------------------ Thomas Sowell (Is Reality Optional?) --+

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