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Diffstat (limited to 'conf/parser.go')
-rw-r--r--conf/parser.go49
1 files changed, 42 insertions, 7 deletions
diff --git a/conf/parser.go b/conf/parser.go
index 85d9b11..75f610c 100644
--- a/conf/parser.go
+++ b/conf/parser.go
@@ -1,3 +1,14 @@
+// grammar of the config file
+//
+// config = module module module
+// module = name object
+// name = 'input' | 'filter' | 'etc.'
+// object = '{' keyvalue | keyvalue | ... '}'
+// keyvalue = statement '=>' value
+// statement = name | if
+// value = literal | '[' literal ']'
+// literal = '"' name '"'
+
package conf
import (
@@ -12,17 +23,41 @@ type Config struct {
}
type parser struct {
- scanner
+ s scanner
+ last token
+ cur token
+}
+
+func newParser(s *scanner) *parser {
+ p := &parser{
+ s: *s,
+ }
+
+ return p
}
func NewConfig(r io.Reader) *Config {
- s := newScanner(r)
- tok, err := s.Scan()
+ p := newParser(newScanner(r))
+ p.startparsing()
+
+ return &Config{}
+}
+
+func (p *parser) startparsing() {
+ var err error
+
+ p.last = p.cur
+ p.cur, err = p.s.Scan()
for err == nil {
- fmt.Fprintf(os.Stderr, "tokentype: %d, token: %q offset: %d, line: %d\n", tok.Type, tok.Lit, tok.Offset, tok.LineNr)
- tok, err = s.Scan()
+ fmt.Fprintf(os.Stderr, "tokentype: %d, token: %q offset: %d, line: %d\n", p.cur.Type, p.cur.Lit, p.cur.Offset, p.cur.LineNr)
+ p.last = p.cur
+ p.cur, err = p.s.Scan()
}
- fmt.Fprintf(os.Stderr, "Error: tokentype: %d, token: %q, err: %v\n", tok.Type, tok.Lit, err)
+ fmt.Fprintf(os.Stderr, "Error: tokentype: %d, token: %q, err: %v\n", p.cur.Type, p.cur.Lit, err)
+}
- return &Config{}
+func (p *parser) module(name string) {
+}
+
+func (p *parser) object() {
}