77 lines
2 KiB
Go
77 lines
2 KiB
Go
/* SHS: Syntactically Homogeneous Shell
|
|
* Copyright (C) 2019 Aidan Hahn
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package ast
|
|
|
|
import "gitlab.com/whom/shs/log"
|
|
|
|
type Operation func(*Token, VarTable, FuncTable) *Token
|
|
|
|
type Function struct {
|
|
Function Operation
|
|
Name string
|
|
TimesCalled int
|
|
Args int // TODO: Make this a list of expected types (TAGs)
|
|
}
|
|
|
|
type FuncTable *map[string]*Function
|
|
|
|
// TODO: Currently only checks arg list length
|
|
func (f Function) ParseFunction(args *Token) bool {
|
|
// handle infinite args
|
|
if f.Args < 0 {
|
|
return true
|
|
}
|
|
|
|
i := f.Args
|
|
for iter := args; iter != nil; iter = iter.Next {
|
|
i -= 1
|
|
}
|
|
|
|
if i != 0 {
|
|
log.Log(log.ERR,
|
|
"Incorrect number of arguments",
|
|
"eval")
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (f Function) CallFunction(args *Token, vt VarTable, ft FuncTable) *Token {
|
|
if !f.ParseFunction(args) {
|
|
log.Log(log.ERR,
|
|
"Couldnt call " + f.Name,
|
|
"eval")
|
|
return nil
|
|
}
|
|
|
|
f.TimesCalled += 1
|
|
return f.Function(args, vt, ft)
|
|
}
|
|
|
|
func GetFunction(arg string, table FuncTable) *Function {
|
|
target, ok := (*table)[arg]
|
|
if !ok {
|
|
log.Log(log.DEBUG,
|
|
"function " + arg + " not found",
|
|
"ftable")
|
|
return nil
|
|
}
|
|
|
|
return target
|
|
}
|