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User guide documentation update #5

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User guide documentation update #5

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20a399b
user_guide: demonstrate use of hexadecimal notation in enums
davidhicks Apr 11, 2017
e8e3fe2
user_guide: add example for use of _parent
davidhicks Apr 11, 2017
e5a6375
user_guide: demonstrate reference to enum values by id
davidhicks Apr 11, 2017
78f6e58
user_guide: add section on streams and substreams
davidhicks Apr 11, 2017
5f258c8
user_guide: add pitfall section on size/substreams
davidhicks Apr 11, 2017
25e86c7
user_guide: add min/max methods for arrays
davidhicks Apr 11, 2017
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33 changes: 33 additions & 0 deletions user_guide.adoc
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Expand Up @@ -832,6 +832,39 @@ other value which was not listed explicitly.
_: rec_type_unknown
----

If an enumeration has already been defined, you can use references to
items in the enumeration instead of specifying integers a second time:
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Actually, if you defined key as enum, then you don't have much choice. You can't compare enums to integers without additional conversions.

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Hmm good point, I'll update the text accordingly


[source,yaml]
----
seq:
- id: key
type: u4
enum: keys
- id: data
type:
switch-on: key
cases:
keys::width: data_field_width
keys::height: data_field_height
keys::depth: data_field_depth
types:
data_field_width:
seq:
#...
data_field_height:
seq:
#...
data_field_depth:
seq:
#...
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Pedantic person in me cries for that misaligned #... ;)
And, anyway, seq is totally optional, so may be it's better to wrap it up as:

types:
  data_field_width: # ...
  data_field_height: # ...
  data_field_depth: # ...

for brevity.

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Thanks, agreed

enums:
keys:
0x77696474: width #widt
0x68656967: height #heig
0x64657074: depth #dept
----

=== Instances: data beyond the sequence

So far we've done all the data specifications in `seq` - thus they'll
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