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toml: add reflection method (#12664)

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Larpon 2021-12-03 11:40:46 +01:00 committed by GitHub
parent 0da7e2f8ab
commit 1d6cc57d9c
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3 changed files with 87 additions and 0 deletions

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@ -226,3 +226,36 @@ fn (a Any) value_(value Any, key []string) Any {
} }
} }
} }
pub fn (a Any) reflect<T>() T {
mut reflected := T{}
$for field in T.fields {
$if field.typ is string {
reflected.$(field.name) = a.value(field.name).default_to('').string()
} $else $if field.typ is bool {
reflected.$(field.name) = a.value(field.name).default_to(false).bool()
} $else $if field.typ is int {
reflected.$(field.name) = a.value(field.name).default_to(0).int()
} $else $if field.typ is f32 {
reflected.$(field.name) = a.value(field.name).default_to(0.0).f32()
} $else $if field.typ is f64 {
reflected.$(field.name) = a.value(field.name).default_to(0.0).f64()
} $else $if field.typ is i64 {
reflected.$(field.name) = a.value(field.name).default_to(0).i64()
} $else $if field.typ is u64 {
reflected.$(field.name) = a.value(field.name).default_to(0).u64()
} $else $if field.typ is Any {
reflected.$(field.name) = a.value(field.name)
} $else $if field.typ is DateTime {
dt := DateTime{'0000-00-00T00:00:00.000'}
reflected.$(field.name) = a.value(field.name).default_to(dt).datetime()
} $else $if field.typ is Date {
da := Date{'0000-00-00'}
reflected.$(field.name) = a.value(field.name).default_to(da).date()
} $else $if field.typ is Time {
t := Time{'00:00:00.000'}
reflected.$(field.name) = a.value(field.name).default_to(t).time()
}
}
return reflected
}

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@ -0,0 +1,50 @@
import toml
const toml_text = '# This TOML can reflect to a struct
name = "Tom"
age = 45
height = 1.97
birthday = 1980-04-23
[bio]
text = "Tom has done many great things"
years_of_service = 5
[config]
data = [ 1, 2, 3 ]
levels = { "info" = 1, "warn" = 2, "critical" = 3 }
'
struct Bio {
text string
years_of_service int
}
struct User {
name string
age int
height f64
birthday toml.Date
config toml.Any
mut:
bio Bio
}
fn test_reflect() {
toml_doc := toml.parse(toml_text) or { panic(err) }
mut user := toml_doc.reflect<User>()
user.bio = toml_doc.value('bio').reflect<Bio>()
assert user.name == 'Tom'
assert user.age == 45
assert user.height == 1.97
assert user.birthday.str() == '1980-04-23'
assert user.bio.text == 'Tom has done many great things'
assert user.bio.years_of_service == 5
assert user.config.value('data[0]').int() == 1
assert user.config.value('levels.warn').int() == 2
}

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@ -173,6 +173,10 @@ pub fn (d Doc) to_any() Any {
return ast_to_any(d.ast.table) return ast_to_any(d.ast.table)
} }
pub fn (d Doc) reflect<T>() T {
return d.to_any().reflect<T>()
}
// value queries a value from the TOML document. // value queries a value from the TOML document.
// `key` supports a small query syntax scheme: // `key` supports a small query syntax scheme:
// Maps can be queried in "dotted" form e.g. `a.b.c`. // Maps can be queried in "dotted" form e.g. `a.b.c`.