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package hil
import (
"strconv"
"github.com/hashicorp/hil/ast"
)
// NOTE: All builtins are tested in engine_test.go
func registerBuiltins(scope *ast.BasicScope) *ast.BasicScope {
if scope == nil {
scope = new(ast.BasicScope)
}
if scope.FuncMap == nil {
scope.FuncMap = make(map[string]ast.Function)
}
// Implicit conversions
scope.FuncMap["__builtin_FloatToInt"] = builtinFloatToInt()
scope.FuncMap["__builtin_FloatToString"] = builtinFloatToString()
scope.FuncMap["__builtin_IntToFloat"] = builtinIntToFloat()
scope.FuncMap["__builtin_IntToString"] = builtinIntToString()
scope.FuncMap["__builtin_StringToInt"] = builtinStringToInt()
scope.FuncMap["__builtin_StringToFloat"] = builtinStringToFloat()
// Math operations
scope.FuncMap["__builtin_IntMath"] = builtinIntMath()
scope.FuncMap["__builtin_FloatMath"] = builtinFloatMath()
return scope
}
func builtinFloatMath() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeInt},
Variadic: true,
VariadicType: ast.TypeFloat,
ReturnType: ast.TypeFloat,
Callback: func(args []interface{}) (interface{}, error) {
op := args[0].(ast.ArithmeticOp)
result := args[1].(float64)
for _, raw := range args[2:] {
arg := raw.(float64)
switch op {
case ast.ArithmeticOpAdd:
result += arg
case ast.ArithmeticOpSub:
result -= arg
case ast.ArithmeticOpMul:
result *= arg
case ast.ArithmeticOpDiv:
result /= arg
}
}
return result, nil
},
}
}
func builtinIntMath() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeInt},
Variadic: true,
VariadicType: ast.TypeInt,
ReturnType: ast.TypeInt,
Callback: func(args []interface{}) (interface{}, error) {
op := args[0].(ast.ArithmeticOp)
result := args[1].(int)
for _, raw := range args[2:] {
arg := raw.(int)
switch op {
case ast.ArithmeticOpAdd:
result += arg
case ast.ArithmeticOpSub:
result -= arg
case ast.ArithmeticOpMul:
result *= arg
case ast.ArithmeticOpDiv:
result /= arg
case ast.ArithmeticOpMod:
result = result % arg
}
}
return result, nil
},
}
}
func builtinFloatToInt() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeFloat},
ReturnType: ast.TypeInt,
Callback: func(args []interface{}) (interface{}, error) {
return int(args[0].(float64)), nil
},
}
}
func builtinFloatToString() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeFloat},
ReturnType: ast.TypeString,
Callback: func(args []interface{}) (interface{}, error) {
return strconv.FormatFloat(
args[0].(float64), 'g', -1, 64), nil
},
}
}
func builtinIntToFloat() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeInt},
ReturnType: ast.TypeFloat,
Callback: func(args []interface{}) (interface{}, error) {
return float64(args[0].(int)), nil
},
}
}
func builtinIntToString() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeInt},
ReturnType: ast.TypeString,
Callback: func(args []interface{}) (interface{}, error) {
return strconv.FormatInt(int64(args[0].(int)), 10), nil
},
}
}
func builtinStringToInt() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeInt},
ReturnType: ast.TypeString,
Callback: func(args []interface{}) (interface{}, error) {
v, err := strconv.ParseInt(args[0].(string), 0, 0)
if err != nil {
return nil, err
}
return int(v), nil
},
}
}
func builtinStringToFloat() ast.Function {
return ast.Function{
ArgTypes: []ast.Type{ast.TypeString},
ReturnType: ast.TypeFloat,
Callback: func(args []interface{}) (interface{}, error) {
v, err := strconv.ParseFloat(args[0].(string), 64)
if err != nil {
return nil, err
}
return v, nil
},
}
}
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