/
symbol.go
199 lines (178 loc) · 4.09 KB
/
symbol.go
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package filter
import (
"encoding/json"
"errors"
"fmt"
js "github.com/bitly/go-simplejson"
"strconv"
"strings"
)
func NewSymlist(name, value string, kind FKind_t) (*SymList, error) {
s := new(SymList)
s.Kind = kind
s.Name = name
if kind == DOUBLE {
if dbl, err := strconv.ParseFloat(value, 64); err != nil {
return nil, err
} else {
s.Value = dbl
}
} else {
s.Value = value
}
s.Next = nil
return s, nil
}
func NewSymlistString(name, value string) (*SymList, error) {
return NewSymlist(name, value, STRING)
}
func NewSymlistDouble(name string, value float64) (*SymList, error) {
s := new(SymList)
s.Kind = DOUBLE
s.Name = name
s.Value = value
s.Next = nil
return s, nil
}
func AppendSymlist(symlist *SymList, name, value string, kind FKind_t) (*SymList, error) {
pre := symlist
found := false
for p := symlist; p != nil; p = p.Next {
if name == p.Name {
found = true
break
}
pre = p
}
if !found {
pre.Next, _ = NewSymlist(name, value, kind)
}
return symlist, nil
}
func AppendSymlistString(symlist *SymList, name, value string) (*SymList, error) {
return AppendSymlist(symlist, name, value, STRING)
}
func AppendSymlistDouble(symlist *SymList, name string, value float64) (*SymList, error) {
pre := symlist
found := false
for p := symlist; p != nil; p = p.Next {
if name == p.Name {
found = true
break
}
pre = p
}
if !found {
pre.Next, _ = NewSymlistDouble(name, value)
}
return symlist, nil
}
func DeleteSymlist(symlist *SymList) {
pre := symlist
for p := symlist; p != nil; {
pre = p
p = p.Next
pre.Next = nil
}
symlist = nil
}
func SymbolLookup(symlist *SymList, name string) (*Factor, error) {
for p := symlist; p != nil; p = p.Next {
if name == p.Name {
if p.Kind == DOUBLE {
if v, err := cast2float64(p.Value); err != nil {
return nil, err
} else {
return NewFactor(DOUBLE, v, "", "", nil)
}
} else {
if v, err := cast2string(p.Value); err != nil {
return nil, err
} else {
return NewFactor(STRING, 0, v, "", nil)
}
}
}
}
return nil, errors.New(fmt.Sprintf("symbol '%s' not found", name))
}
func DumpSymlist(symlist *SymList) {
dump := "NAME\tVALUE\tTYPE\n======================\n"
for p := symlist; p != nil; p = p.Next {
if p.Kind == DOUBLE {
dump += fmt.Sprintf("%s\t%.2f\tDOUBLE\n", p.Name, p.Value)
} else {
dump += fmt.Sprintf("%s\t'%s'\tSTRING\n", p.Name, p.Value)
}
}
fmt.Print(dump)
}
/*
* parse a query string to symlist_t struct , string format should be:
* nmq=testmq&mac=xxxx&bootid=xxxx...
*/
func QueryToSymlist(query string) (symlist *SymList, err error) {
var middle int = 0
var end int = 0
data := query
for {
middle = strings.IndexByte(data, '=')
if middle == -1 {
break
}
end = strings.IndexByte(data[middle:], '&')
if end == -1 {
if symlist == nil {
symlist, _ = NewSymlist(data[:middle], data[middle+1:], STRING)
} else {
symlist, _ = AppendSymlistString(symlist, data[:middle], data[middle+1:])
}
break
} else {
if symlist == nil {
symlist, _ = NewSymlist(data[:middle], data[middle+1:middle+end], STRING)
} else {
symlist, _ = AppendSymlistString(symlist, data[:middle], data[middle+1:middle+end])
}
data = data[middle+end+1:]
}
}
return symlist, err
}
/*
* parse a JSON string to symlist_t struct, string format should be:
* {"double_name":10.0, "interger_name": 99, "string_name":"FIFA WC 2014", ...}
*/
func JsonToSymlist(jstr string) (symlist *SymList, err error) {
jsroot, err := js.NewJson([]byte(jstr))
if err != nil {
return nil, err
}
jsMap, err := jsroot.Map()
if err != nil {
return nil, err
}
for k, v := range jsMap {
switch u := v.(type) {
case json.Number:
dbl, err := v.(json.Number).Float64()
if err != nil {
continue
}
if symlist == nil {
symlist, _ = NewSymlistDouble(k, dbl)
} else {
symlist, _ = AppendSymlistDouble(symlist, k, dbl)
}
case string:
if symlist == nil {
symlist, _ = NewSymlistString(k, u)
} else {
symlist, _ = AppendSymlistString(symlist, k, u)
}
default:
continue
}
}
return symlist, nil
}