66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package config
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strings"
|
|
)
|
|
|
|
// NOTE: This parser is non-reentrant due to its dependence on global state.
|
|
|
|
// GoLex sadly needs these global variables for storing temporary token/parsing information.
|
|
var yylval *yySymType // For storing extra token information, like the contents of a string.
|
|
var yyline int // Line number within the current file or buffer.
|
|
var yypos int // Character position within the current line.
|
|
var parsedConfig = New() // Temporary variable for storing the parsed configuration.
|
|
|
|
type ConfigLexer struct {
|
|
errors []string
|
|
}
|
|
|
|
func (lexer *ConfigLexer) Lex(lval *yySymType) int {
|
|
yylval = lval
|
|
token_type := yylex()
|
|
return token_type
|
|
}
|
|
|
|
func (lexer *ConfigLexer) Error(errorStr string) {
|
|
err := fmt.Sprintf("Error reading config at line %v, char %v: %v", yyline, yypos, errorStr)
|
|
lexer.errors = append(lexer.errors, err)
|
|
}
|
|
|
|
func LoadFromReader(configReader io.Reader) (*Config, error) {
|
|
yyin = configReader
|
|
yypos = 1
|
|
yyline = 1
|
|
yydata = ""
|
|
yytext = ""
|
|
|
|
lexer := &ConfigLexer{}
|
|
yyParse(lexer)
|
|
|
|
if len(lexer.errors) > 0 {
|
|
err := errors.New(strings.Join(lexer.errors, "\n"))
|
|
return &Config{}, err
|
|
}
|
|
|
|
return parsedConfig, nil
|
|
}
|
|
|
|
func LoadFromString(configString string) (*Config, error) {
|
|
configReader := strings.NewReader(configString)
|
|
return LoadFromReader(configReader)
|
|
}
|
|
|
|
func LoadFromFile(fileName string) (*Config, error) {
|
|
configReader, err := os.Open(fileName)
|
|
if err != nil {
|
|
return &Config{}, err
|
|
}
|
|
defer configReader.Close()
|
|
|
|
return LoadFromReader(configReader)
|
|
}
|