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dot_env_parser.go
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/
dot_env_parser.go
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package parser
import (
"fmt"
)
func dotEnvParser() Func {
assignmentParser := Sequence(
NotInSet('=', ' ', '\n', '#'),
Optional(SpacesAndTabs()),
Char('='),
Optional(SpacesAndTabs()),
Optional(OneOf(QuotedString(), NotInSet('#', ' ', '\n'))),
Optional(SpacesAndTabs()),
)
envFileParser := Delimited(
Expect(OneOf(
assignmentParser,
SpacesAndTabs(),
EmptyLine(),
EndOfInput(),
Sequence(
Char('#'),
Optional(UntilFail(NotChar('\n'))),
),
), "Environment variable assignment"),
NewlineAllowComment(),
)
return func(input []rune) Result {
res := envFileParser(input)
if res.Err != nil {
return res
}
vars := map[string]string{}
for _, line := range res.Payload.(DelimitedResult).Primary {
sequence, _ := line.([]any)
if len(sequence) == 6 {
key := sequence[0].(string)
value, _ := sequence[4].(string)
vars[key] = value
}
}
res.Payload = vars
return res
}
}
// ParseDotEnvFile attempts to parse a .env file containing environment variable
// assignments, and returns either a map of key/value assignments or an error.
func ParseDotEnvFile(envFileBytes []byte) (map[string]string, error) {
input := string(envFileBytes)
res := dotEnvParser()([]rune(input))
if res.Err != nil {
line, _ := LineAndColOf([]rune(input), res.Err.Input)
return nil, fmt.Errorf("%v: %v", line, res.Err.ErrorAtPositionStructured("", []rune(input)))
}
return res.Payload.(map[string]string), nil
}