mirror of
https://github.com/prometheus/prometheus.git
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80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"strings"
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)
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// NOTE: This parser is non-reentrant due to its dependence on global state.
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// GoLex sadly needs these global variables for storing temporary token/parsing information.
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var yylval *yySymType // For storing extra token information, like the contents of a string.
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var yyline int // Line number within the current file or buffer.
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var yypos int // Character position within the current line.
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var parsedConfig *Config // Temporary variable for storing the parsed configuration.
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type ConfigLexer struct {
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errors []string
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}
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func (lexer *ConfigLexer) Lex(lval *yySymType) int {
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yylval = lval
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token_type := yylex()
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return token_type
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}
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func (lexer *ConfigLexer) Error(errorStr string) {
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err := fmt.Sprintf("Error reading config at line %v, char %v: %v", yyline, yypos, errorStr)
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lexer.errors = append(lexer.errors, err)
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}
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func LoadFromReader(configReader io.Reader) (*Config, error) {
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parsedConfig = New()
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yyin = configReader
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yypos = 1
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yyline = 1
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yydata = ""
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yytext = ""
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lexer := &ConfigLexer{}
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yyParse(lexer)
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if len(lexer.errors) > 0 {
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err := errors.New(strings.Join(lexer.errors, "\n"))
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return &Config{}, err
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}
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return parsedConfig, nil
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}
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func LoadFromString(configString string) (*Config, error) {
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configReader := strings.NewReader(configString)
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return LoadFromReader(configReader)
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}
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func LoadFromFile(fileName string) (*Config, error) {
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configReader, err := os.Open(fileName)
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if err != nil {
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return &Config{}, err
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}
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defer configReader.Close()
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return LoadFromReader(configReader)
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}
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