This commit is contained in:
Adnan Hajdarevic 2021-04-03 18:01:13 +02:00
parent e329b6d9ff
commit 568c711625
138 changed files with 22876 additions and 90497 deletions

89
vendor/github.com/antonmedv/expr/conf/config.go generated vendored Normal file
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package conf
import (
"fmt"
"reflect"
"github.com/antonmedv/expr/ast"
"github.com/antonmedv/expr/vm"
)
type Config struct {
Env interface{}
MapEnv bool
Types TypesTable
Operators OperatorsTable
Expect reflect.Kind
Optimize bool
Strict bool
DefaultType reflect.Type
ConstExprFns map[string]reflect.Value
Visitors []ast.Visitor
err error
}
func New(env interface{}) *Config {
var mapEnv bool
var mapValueType reflect.Type
if _, ok := env.(map[string]interface{}); ok {
mapEnv = true
} else {
if reflect.ValueOf(env).Kind() == reflect.Map {
mapValueType = reflect.TypeOf(env).Elem()
}
}
return &Config{
Env: env,
MapEnv: mapEnv,
Types: CreateTypesTable(env),
Optimize: true,
Strict: true,
DefaultType: mapValueType,
ConstExprFns: make(map[string]reflect.Value),
}
}
// Check validates the compiler configuration.
func (c *Config) Check() error {
// Check that all functions that define operator overloading
// exist in environment and have correct signatures.
for op, fns := range c.Operators {
for _, fn := range fns {
fnType, ok := c.Types[fn]
if !ok || fnType.Type.Kind() != reflect.Func {
return fmt.Errorf("function %s for %s operator does not exist in environment", fn, op)
}
requiredNumIn := 2
if fnType.Method {
requiredNumIn = 3 // As first argument of method is receiver.
}
if fnType.Type.NumIn() != requiredNumIn || fnType.Type.NumOut() != 1 {
return fmt.Errorf("function %s for %s operator does not have a correct signature", fn, op)
}
}
}
// Check that all ConstExprFns are functions.
for name, fn := range c.ConstExprFns {
if fn.Kind() != reflect.Func {
return fmt.Errorf("const expression %q must be a function", name)
}
}
return c.err
}
func (c *Config) ConstExpr(name string) {
if c.Env == nil {
c.Error(fmt.Errorf("no environment for const expression: %v", name))
return
}
c.ConstExprFns[name] = vm.FetchFn(c.Env, name)
}
func (c *Config) Error(err error) {
if c.err == nil {
c.err = err
}
}

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package conf
import "reflect"
// OperatorsTable maps binary operators to corresponding list of functions.
// Functions should be provided in the environment to allow operator overloading.
type OperatorsTable map[string][]string
func FindSuitableOperatorOverload(fns []string, types TypesTable, l, r reflect.Type) (reflect.Type, string, bool) {
for _, fn := range fns {
fnType := types[fn]
firstInIndex := 0
if fnType.Method {
firstInIndex = 1 // As first argument to method is receiver.
}
firstArgType := fnType.Type.In(firstInIndex)
secondArgType := fnType.Type.In(firstInIndex + 1)
firstArgumentFit := l == firstArgType || (firstArgType.Kind() == reflect.Interface && (l == nil || l.Implements(firstArgType)))
secondArgumentFit := r == secondArgType || (secondArgType.Kind() == reflect.Interface && (r == nil || r.Implements(secondArgType)))
if firstArgumentFit && secondArgumentFit {
return fnType.Type.Out(0), fn, true
}
}
return nil, "", false
}

100
vendor/github.com/antonmedv/expr/conf/types_table.go generated vendored Normal file
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package conf
import "reflect"
type Tag struct {
Type reflect.Type
Method bool
Ambiguous bool
}
type TypesTable map[string]Tag
// CreateTypesTable creates types table for type checks during parsing.
// If struct is passed, all fields will be treated as variables,
// as well as all fields of embedded structs and struct itself.
//
// If map is passed, all items will be treated as variables
// (key as name, value as type).
func CreateTypesTable(i interface{}) TypesTable {
if i == nil {
return nil
}
types := make(TypesTable)
v := reflect.ValueOf(i)
t := reflect.TypeOf(i)
d := t
if t.Kind() == reflect.Ptr {
d = t.Elem()
}
switch d.Kind() {
case reflect.Struct:
types = FieldsFromStruct(d)
// Methods of struct should be gathered from original struct with pointer,
// as methods maybe declared on pointer receiver. Also this method retrieves
// all embedded structs methods as well, no need to recursion.
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
types[m.Name] = Tag{Type: m.Type, Method: true}
}
case reflect.Map:
for _, key := range v.MapKeys() {
value := v.MapIndex(key)
if key.Kind() == reflect.String && value.IsValid() && value.CanInterface() {
types[key.String()] = Tag{Type: reflect.TypeOf(value.Interface())}
}
}
// A map may have method too.
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
types[m.Name] = Tag{Type: m.Type, Method: true}
}
}
return types
}
func FieldsFromStruct(t reflect.Type) TypesTable {
types := make(TypesTable)
t = dereference(t)
if t == nil {
return types
}
switch t.Kind() {
case reflect.Struct:
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
if f.Anonymous {
for name, typ := range FieldsFromStruct(f.Type) {
if _, ok := types[name]; ok {
types[name] = Tag{Ambiguous: true}
} else {
types[name] = typ
}
}
}
types[f.Name] = Tag{Type: f.Type}
}
}
return types
}
func dereference(t reflect.Type) reflect.Type {
if t == nil {
return nil
}
if t.Kind() == reflect.Ptr {
t = dereference(t.Elem())
}
return t
}