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v/vlib/toml/toml.v

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// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module toml
import toml.ast
import toml.util
import toml.input
import toml.scanner
import toml.parser
import time
// Null is used in sumtype checks as a "default" value when nothing else is possible.
pub struct Null {
}
// Config is used to configure the toml parser.
// Only one of the fields `text` or `file_path`, is allowed to be set at time of configuration.
pub struct Config {
pub:
text string // TOML text
file_path string // '/path/to/file.toml'
parse_comments bool
}
// Doc is a representation of a TOML document.
// A document can be constructed from a `string` buffer or from a file path
pub struct Doc {
pub:
ast &ast.Root
}
// parse_file parses the TOML file in `path`.
pub fn parse_file(path string) ?Doc {
input_config := input.Config{
file_path: path
}
scanner_config := scanner.Config{
input: input_config
}
parser_config := parser.Config{
scanner: scanner.new_scanner(scanner_config) ?
}
mut p := parser.new_parser(parser_config)
ast := p.parse() ?
return Doc{
ast: ast
}
}
// parse_text parses the TOML document provided in `text`.
pub fn parse_text(text string) ?Doc {
input_config := input.Config{
text: text
}
scanner_config := scanner.Config{
input: input_config
}
parser_config := parser.Config{
scanner: scanner.new_scanner(scanner_config) ?
}
mut p := parser.new_parser(parser_config)
ast := p.parse() ?
return Doc{
ast: ast
}
}
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// parse parses the TOML document provided in `toml`.
// parse automatically try to determine if the type of `toml` is a file or text.
// For explicit parsing of input types see `parse_file` or `parse_text`.
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pub fn parse(toml string) ?Doc {
mut input_config := input.auto_config(toml) ?
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scanner_config := scanner.Config{
input: input_config
}
parser_config := parser.Config{
scanner: scanner.new_scanner(scanner_config) ?
}
mut p := parser.new_parser(parser_config)
ast := p.parse() ?
return Doc{
ast: ast
}
}
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// to_json returns a compact json string of the complete document.
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pub fn (d Doc) to_json() string {
return d.ast.to_json()
}
// value queries a value from the TOML document.
pub fn (d Doc) value(key string) Any {
values := d.ast.table as map[string]ast.Value
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// any_values := d.ast_to_any(values) as map[string]Any
return d.get_map_value_as_any(values, key)
}
// ast_to_any_value converts `from` ast.Value to toml.Any value.
fn (d Doc) ast_to_any(value ast.Value) Any {
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// `match` isn't currently very suitable for further unwrapping sumtypes in the if's...
if value is ast.Date || value is ast.Time || value is ast.DateTime {
mut tim := time.Time{}
if value is ast.Date {
date_str := (value as ast.Date).text
tim = time.parse_rfc3339(date_str) or {
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN +
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// ' failed converting "$date_str" to rfc3339: $err')
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}
} else if value is ast.Time {
time_str := (value as ast.Time).text
tim = time.parse_rfc3339(time_str) or {
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN +
// ' failed converting "$time_str" to rfc3339: $err')
}
} else {
// value is ast.DateTime
datetime_str := (value as ast.DateTime).text
tim = time.parse_rfc3339(datetime_str) or {
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN +
// ' failed converting "$datetime_str" to rfc3339: $err')
}
}
return Any(tim)
}
match value {
ast.Quoted {
return Any((value as ast.Quoted).text)
}
ast.Number {
str := (value as ast.Number).text
if str.contains('.') {
return Any(str.f64())
}
return Any(str.i64())
}
ast.Bool {
str := (value as ast.Bool).text
if str == 'true' {
return Any(true)
}
return Any(false)
}
map[string]ast.Value {
m := (value as map[string]ast.Value)
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mut am := map[string]Any{}
for k, v in m {
am[k] = d.ast_to_any(v)
}
return am
// return d.get_map_value(m, key_split[1..].join('.'))
}
[]ast.Value {
a := (value as []ast.Value)
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mut aa := []Any{}
for val in a {
aa << d.ast_to_any(val)
}
return aa
}
else {
return Any(Null{})
}
}
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN + ' can\'t convert "$value"')
// return Any('')
}
// get_map_value_as_any returns the value found at `key` in the map `values` as `Any` type.
fn (d Doc) get_map_value_as_any(values map[string]ast.Value, key string) Any {
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key_split := key.split('.')
util.printdbg(@MOD + '.' + @STRUCT + '.' + @FN, ' getting "${key_split[0]}"')
if key_split[0] in values.keys() {
value := values[key_split[0]] or {
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN + ' key "$key" does not exist')
}
// `match` isn't currently very suitable for these types of sum type constructs...
if value is map[string]ast.Value {
m := (value as map[string]ast.Value)
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next_key := key_split[1..].join('.')
if next_key == '' {
return d.ast_to_any(value)
}
return d.get_map_value_as_any(m, next_key)
}
return d.ast_to_any(value)
}
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN + ' key "$key" does not exist')
}