mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
148 lines
3.5 KiB
Markdown
148 lines
3.5 KiB
Markdown
# TOML module
|
|
`toml` is a fully fledged [TOML v1.0.0](https://toml.io/en/v1.0.0) compatible parser written in pure V.
|
|
The module is tested against the [official compliance tests](https://github.com/toml-lang/compliance).
|
|
|
|
## Usage
|
|
|
|
Parsing files or `string`s containing TOML is easy.
|
|
|
|
Simply import the `toml` module and do:
|
|
```v ignore
|
|
doc := toml.parse(<file path or string>) or { panic(err) }
|
|
```
|
|
|
|
## Example
|
|
|
|
Here we parse the official [TOML example](https://github.com/toml-lang/toml/blob/3b11f6921da7b6f5db37af039aa021fee450c091/README.md#Example)
|
|
and print out some values.
|
|
|
|
```v
|
|
import toml
|
|
|
|
const toml_text = '# This is a TOML document.
|
|
|
|
title = "TOML Example"
|
|
|
|
[owner]
|
|
name = "Tom Preston-Werner"
|
|
dob = 1979-05-27T07:32:00-08:00 # First class dates
|
|
|
|
[database]
|
|
server = "192.168.1.1"
|
|
ports = [ 8000, 8001, 8002 ]
|
|
connection_max = 5000
|
|
enabled = true
|
|
|
|
[servers]
|
|
|
|
# Indentation (tabs and/or spaces) is allowed but not required
|
|
[servers.alpha]
|
|
ip = "10.0.0.1"
|
|
dc = "eqdc10"
|
|
|
|
[servers.beta]
|
|
ip = "10.0.0.2"
|
|
dc = "eqdc10"
|
|
|
|
[clients]
|
|
data = [ ["gamma", "delta"], [1, 2] ]
|
|
|
|
# Line breaks are OK when inside arrays
|
|
hosts = [
|
|
"alpha",
|
|
"omega"
|
|
]'
|
|
|
|
fn main() {
|
|
doc := toml.parse(toml_text) or { panic(err) }
|
|
title := doc.value('title').string()
|
|
println('title: "$title"')
|
|
ip := doc.value('servers.alpha.ip').string()
|
|
println('Server IP: "$ip"')
|
|
}
|
|
```
|
|
|
|
## Value retrieval
|
|
|
|
The `toml` module supports easy retrieval of values from
|
|
TOML documents by using a small and simple query syntax
|
|
as argument to the `value()` function.
|
|
|
|
Keys in map entries are denoted by `.` and array entries
|
|
uses `[<int>]`. Quoted keys are also supported by using
|
|
the delimiters `"` or `'`.
|
|
|
|
`doc.value('table.array[0].a."b.c"')`
|
|
|
|
To query for a value that might not be in the document you
|
|
can use the `.default_to(...)` function to provide a
|
|
default value.
|
|
|
|
```v
|
|
import toml
|
|
|
|
const toml_text = '
|
|
val = true
|
|
|
|
[table]
|
|
array = [
|
|
{ a = "A" },
|
|
{ b = "B" }
|
|
]
|
|
'
|
|
|
|
doc := toml.parse(toml_text) or { panic(err) }
|
|
|
|
assert doc.value('val').bool() == true
|
|
assert doc.value('table.array[0].a').string() == 'A'
|
|
|
|
// Provides a default value
|
|
assert doc.value('non.existing').default_to(false).bool() == false
|
|
|
|
// You can pass parts of the TOML document around
|
|
// and still use .value() to get the values
|
|
arr := doc.value('table.array')
|
|
assert arr.value('[1].b').string() == 'B'
|
|
```
|
|
|
|
### Conversion
|
|
|
|
Any TOML value can be converted to a V equivalent type.
|
|
|
|
TOML values are represented as the `toml.Any` sum-type that
|
|
can be converted to a V type.
|
|
|
|
| TOML value | V conversion (via `toml.Any`) |
|
|
| -------------------------- | ----------------------------- |
|
|
| val = "Basic string" | .string() |
|
|
| val = 'Literal string' | .string() |
|
|
| val = true | .bool() |
|
|
| val = 1979-05-27T07:32:00Z | .datetime() (toml.DateTime) |
|
|
| val = 1979-05-27 | .date() (toml.Date) |
|
|
| val = 07:32:59 | .time() (toml.Time) |
|
|
| val = 3.14 | .f32() / .f64() |
|
|
| val = 100 | .int() / .i64() / .u64() |
|
|
|
|
Read more about values in the [TOML specification](https://toml.io/en/v1.0.0#spec).
|
|
|
|
## TOML to JSON
|
|
|
|
The `toml.to` module supports easy serialization of any TOML to JSON.
|
|
|
|
```v
|
|
import toml
|
|
import toml.to
|
|
|
|
const toml_text = '
|
|
val = true
|
|
[table]
|
|
array = [
|
|
{ a = "A" },
|
|
{ b = "B" }
|
|
]
|
|
'
|
|
|
|
doc := toml.parse(toml_text) or { panic(err) }
|
|
assert to.json(doc) == '{ "val": true, "table": { "array": [ { "a": "A" }, { "b": "B" } ] } }'
|
|
```
|