Use YAML version traits in the scanner#228
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* Performance improvement of `scan_line_break`. * Rename `scan_line_break` to `yaml_1_1_scan_line_break`. * Add `yaml_1_2_scan_line_break`. * Add better comments. * Add a TODO comment about possible bugs.
* Bug fix. * Change to use `yaml_1_1_` prefix for YAML 1.1's `forwardchars!`. * Add `yaml_1_2_forwardchars!` for YAML 1.2's `forwardchars!`. * Add some helper functions for `forwardchars!`: * `forwardchar_skip!` * `forwardchar_nobreak!` * `forwardchar_breakline!`
Here we use abstract type & subtyping because it's common traits pattern
in Julia.
We do not need to export these objects because we can use strings for
versions in user-facing functions like:
```julia
function load(str::AbstractString; version::YAMLVersion)
# ...
end
function load(str::AbstractString; version::AbstractString)
version == "1.1" ? load(str, version=YAMLV1_1()) :
version == "1.2" ? load(str, version=YAMLV1_2()) :
throw(ErrorException())
end
load(str, version="1.1")
```
* Sort out functions. * Add `b-char` for YAML 1.2. * Add comments to `forwardchars!`.
Paalon
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Use version traits for most functions in the scanner.