// Parse parses the given configuration file and returns a Tavor token out of it
func Parse(file string) (token.Token, error) {
buf, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
var conf Config
if _, err := toml.Decode(string(buf), &conf); err != nil {
return nil, err
}
// build variables out from the configuration file
variables := make(map[string]token.Token)
for k, a := range conf.Variables {
var l []token.Token
//for _, s := range a {
// l = append(l, primitives.NewConstantString(s))
//}
// use only the boundary values (first, mid, last) of the variable for now
if len(a) >= 1 {
l = append(l, primitives.NewConstantString(a[0]))
if len(a) >= 3 {
l = append(l, primitives.NewConstantString(a[len(a)/2]))
}
if len(a) >= 2 {
l = append(l, primitives.NewConstantString(a[len(a)-1]))
}
}
variables[k] = lists.NewOne(l...)
}
dir := filepath.Dir(file)
var l []token.Token
// parse all instruction files
for _, instructions := range conf.Instructions {
file := filepath.Join(dir, instructions)
t, err := parseInstructions(file, variables)
if err != nil {
return nil, err
}
l = append(l, t)
}
one := lists.NewOne(l...)
all := lists.NewAll(one, primitives.NewConstantString("\n"))
return lists.NewRepeat(all, 1, int64(tavor.MaxRepeat)), nil
}
func parseInstructions(file string, variables map[string]token.Token) (token.Token, error) {
buf, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
l := lex(string(buf))
var instructions []token.Token
var currInstr []token.Token
for i := l.nextItem(); i.typ != itemEOF; i = l.nextItem() {
switch i.typ {
case itemNewLine:
instructions = append(instructions, lists.NewAll(currInstr...))
currInstr = nil
case itemText:
currInstr = append(currInstr, primitives.NewConstantString(i.val))
case itemInteger:
signed := i.val[1] == 'i'
nbBits, _ := strconv.Atoi(i.val[2:])
var from, to int
if signed {
from = -(1 << (uint(nbBits) - 1))
to = (1 << (uint(nbBits) - 1)) - 1
} else {
from = 0
to = (1 << uint(nbBits)) - 1
}
currInstr = append(currInstr, primitives.NewRangeInt(from, to))
case itemLabel:
currInstr = append(currInstr, primitives.NewConstantString("$l"))
case itemKey:
key := i.val[1:]
if variable, ok := variables[key]; ok {
currInstr = append(currInstr, variable.Clone())
} else {
err := fmt.Errorf("error: %s:%d: variable %s not found", file, l.lineNumber(), key)
return nil, err
}
case itemError:
err := fmt.Errorf("error: %s:%d: %s", file, l.lineNumber(), i.val)
return nil, err
}
}
if len(currInstr) > 0 {
instructions = append(instructions, lists.NewAll(currInstr...))
}
return lists.NewOne(instructions...), nil
}