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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.input
import toml.scanner
import toml.parser
// Null is used in sumtype checks as a "default" value when nothing else is possible.
pub struct Null {
}
// decode decodes a TOML `string` into the target type `T`.
pub fn decode<T>(toml_txt string) ?T {
doc := parse_text(toml_txt) ?
mut typ := T{}
typ.from_toml(doc.to_any())
return typ
}
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// encode encodes the type `T` into a TOML string.
// Currently encode expects the method `.to_toml()` exists on `T`.
pub fn encode<T>(typ T) string {
return typ.to_toml()
}
// DateTime is the representation of an RFC 3339 datetime string.
pub struct DateTime {
datetime string
}
pub fn (dt DateTime) str() string {
return dt.datetime
}
// Date is the representation of an RFC 3339 date-only string.
pub struct Date {
date string
}
pub fn (d Date) str() string {
return d.date
}
// Time is the representation of an RFC 3339 time-only string.
pub struct Time {
time string
}
pub fn (t Time) str() string {
return t.time
}
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// 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
}
}
// parse_dotted_key converts `key` string to an array of strings.
// parse_dotted_key preserves strings delimited by both `"` and `'`.
pub fn parse_dotted_key(key string) ?[]string {
mut out := []string{}
mut buf := ''
mut in_string := false
mut delim := byte(` `)
for ch in key {
if ch in [`"`, `'`] {
if !in_string {
delim = ch
}
in_string = !in_string && ch == delim
if !in_string {
if buf != '' && buf != ' ' {
out << buf
}
buf = ''
delim = ` `
}
continue
}
buf += ch.ascii_str()
if !in_string && ch == `.` {
if buf != '' && buf != ' ' {
buf = buf[..buf.len - 1]
if buf != '' && buf != ' ' {
out << buf
}
}
buf = ''
continue
}
}
if buf != '' && buf != ' ' {
out << buf
}
if in_string {
return error(@FN +
': could not parse key, missing closing string delimiter `$delim.ascii_str()`')
}
return out
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}
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// parse_array_key converts `key` string to a key and index part.
fn parse_array_key(key string) (string, int) {
mut index := -1
mut k := key
if k.contains('[') {
index = k.all_after('[').all_before(']').int()
if k.starts_with('[') {
k = '' // k.all_after(']')
} else {
k = k.all_before('[')
}
}
return k, index
}
// to_any converts the `Doc` to toml.Any type.
pub fn (d Doc) to_any() Any {
return ast_to_any(d.ast.table)
}
// reflect returns `T` with `T.<field>`'s value set to the
// value of any 1st level TOML key by the same name.
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pub fn (d Doc) reflect<T>() T {
return d.to_any().reflect<T>()
}
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// value queries a value from the TOML document.
// `key` supports a small query syntax scheme:
// Maps can be queried in "dotted" form e.g. `a.b.c`.
// quoted keys are supported as `a."b.c"` or `a.'b.c'`.
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// Arrays can be queried with `a[0].b[1].[2]`.
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pub fn (d Doc) value(key string) Any {
key_split := parse_dotted_key(key) or { return Any(Null{}) }
return d.value_(d.ast.table, key_split)
}
// value_ returns the value found at `key` in the map `values` as `Any` type.
fn (d Doc) value_(value ast.Value, key []string) Any {
assert key.len > 0
mut ast_value := ast.Value(ast.Null{})
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k, index := parse_array_key(key[0])
if k == '' {
a := value as []ast.Value
ast_value = a[index] or { return Any(Null{}) }
}
if value is map[string]ast.Value {
ast_value = value[k] or { return Any(Null{}) }
if index > -1 {
a := ast_value as []ast.Value
ast_value = a[index] or { return Any(Null{}) }
}
}
if key.len <= 1 {
return ast_to_any(ast_value)
}
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match ast_value {
map[string]ast.Value, []ast.Value {
return d.value_(ast_value, key[1..])
}
else {
return ast_to_any(value)
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}
}
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}
// ast_to_any converts `from` ast.Value to toml.Any value.
pub fn ast_to_any(value ast.Value) Any {
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match value {
ast.Date {
return Any(Date{value.text})
}
ast.Time {
return Any(Time{value.text})
}
ast.DateTime {
return Any(DateTime{value.text})
}
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ast.Quoted {
return Any(value.text)
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}
ast.Number {
val_text := value.text
if val_text == 'inf' || val_text == '+inf' || val_text == '-inf' {
// NOTE values taken from strconv
if !val_text.starts_with('-') {
// strconv.double_plus_infinity
return Any(u64(0x7FF0000000000000))
} else {
// strconv.double_minus_infinity
return Any(u64(0xFFF0000000000000))
}
}
if val_text == 'nan' || val_text == '+nan' || val_text == '-nan' {
return Any('nan')
}
if !val_text.starts_with('0x')
&& (val_text.contains('.') || val_text.to_lower().contains('e')) {
return Any(value.f64())
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}
return Any(value.i64())
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}
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] = ast_to_any(v)
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}
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 << ast_to_any(val)
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}
return aa
}
else {
return Any(Null{})
}
}
return Any(Null{})
// TODO decide this
// panic(@MOD + '.' + @STRUCT + '.' + @FN + ' can\'t convert "$value"')
// return Any('')
}