summaryrefslogtreecommitdiff
path: root/conf
diff options
context:
space:
mode:
authorSilvan Jegen <s.jegen@gmail.com>2016-12-25 19:29:55 +0100
committerSilvan Jegen <s.jegen@gmail.com>2016-12-25 19:29:55 +0100
commit5d73aea0169c691b4c96d85353b1dccc5c1199e2 (patch)
tree997b5e9be454fd205628b585e723b6c80c225a1a /conf
parent0ad0f3a85145f2b64cf5cbffa57cdb779180b724 (diff)
Start writing the parser
Diffstat (limited to 'conf')
-rw-r--r--conf/parser.go49
-rw-r--r--conf/scanner.go4
2 files changed, 44 insertions, 9 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() {
}
diff --git a/conf/scanner.go b/conf/scanner.go
index 3d83534..9bd7a4b 100644
--- a/conf/scanner.go
+++ b/conf/scanner.go
@@ -14,7 +14,8 @@ type tokentype int
const (
Name tokentype = iota
Literal
- Delimiter
+ DeliOpen
+ DeliClose
Nothing
IfStatement
)
@@ -27,7 +28,6 @@ type token struct {
}
type scanner struct {
- r io.Reader
data []byte
offset int
curline int