/
exprEval.go
442 lines (405 loc) · 11.7 KB
/
exprEval.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
package eval
import (
"fmt"
"os"
"reflect"
"sort"
"strings"
"github.com/anz-bank/sysl/pkg/parse"
sysl "github.com/anz-bank/sysl/pkg/sysl"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"google.golang.org/protobuf/proto"
)
func evalTransformStmts(ee *exprEval, assign Scope, tform *sysl.Expr_Transform) *sysl.Value {
result := MakeValueMap()
for _, s := range tform.Stmt {
switch ss := s.Stmt.(type) {
case *sysl.Expr_Transform_Stmt_Let:
ee.LogEntry().Debugf("Evaluating var %s", ss.Let.Name)
res := Eval(ee, assign, ss.Let.Expr)
if ss.Let.Name == parse.TemplateLogString {
fmt.Printf("%s", res.GetS())
} else {
assign[ss.Let.Name] = res
}
ee.LogEntry().Tracef("Eval Result %s =: %v\n", ss.Let.Name, res)
case *sysl.Expr_Transform_Stmt_Assign_:
ee.LogEntry().Debugf("Evaluating %s", ss.Assign.Name)
res := Eval(ee, assign, ss.Assign.Expr)
ee.LogEntry().Tracef("Eval Result %s =:\n\t\t %v:\n", ss.Assign.Name, res)
AddItemToValueMap(result, ss.Assign.Name, res)
// TODO: case *sysl.Expr_Transform_Stmt_Inject:
}
}
if text, has := assign[parse.TemplateImpliedResult]; has {
delete(assign, parse.TemplateImpliedResult)
return text
}
if len(result.GetMap().Items) == 0 {
ee.LogEntry().Warn("Eval result empty, did you use `let` incorrectly?")
}
return result
}
func setAppender(collection []*sysl.Value, newVal *sysl.Value) []*sysl.Value {
found := false
for _, result := range collection {
if proto.Equal(newVal, result) {
found = true
break
}
}
if !found {
collection = append(collection, newVal)
}
return collection
}
func listAppender(collection []*sysl.Value, newVal *sysl.Value) []*sysl.Value {
return append(collection, newVal)
}
func evalTransformUsingAppender(
ee *exprEval,
x *sysl.Expr_Transform,
assign Scope,
v []*sysl.Value,
appender func(collection []*sysl.Value, newVal *sysl.Value) []*sysl.Value,
) []*sysl.Value {
listResult := []*sysl.Value{}
scopeVar := x.Scopevar
for _, svar := range v {
assign[scopeVar] = svar
res := evalTransformStmts(ee, assign, x)
listResult = appender(listResult, res)
}
delete(assign, scopeVar)
logrus.Tracef("Transform Result (As List/Set): %v", listResult)
return listResult
}
func evalTransformUsingValueSet(
ee *exprEval,
x *sysl.Expr_Transform,
assign Scope,
v []*sysl.Value,
) []*sysl.Value {
return evalTransformUsingAppender(ee, x, assign, v, setAppender)
}
func evalTransformUsingValueList(
ee *exprEval,
x *sysl.Expr_Transform,
assign Scope,
v []*sysl.Value,
) []*sysl.Value {
return evalTransformUsingAppender(ee, x, assign, v, listAppender)
}
// Eval expr
// TODO: Add type checks
func Eval(ee *exprEval, assign Scope, e *sysl.Expr) *sysl.Value {
val, _ := ee.eval(assign, e) //nolint:errcheck
return val
}
func (ee *exprEval) evalTransform(assign Scope, x *sysl.Expr_Transform_, e *sysl.Expr) *sysl.Value {
logrus.Tracef("Evaluating Transform:\tRet Type: %v", e.Type)
arg := x.Transform.Arg
if arg.GetName() == "." {
logrus.Warn("Expr Arg is empty")
return nil
}
argValue := Eval(ee, assign, arg)
dotValue, hasDot := assign["."]
defer func() {
if hasDot {
assign["."] = dotValue
}
}()
switch argValue.Value.(type) {
case *sysl.Value_Set, *sysl.Value_List_:
switch e.Type.Type.(type) {
case *sysl.Type_Set:
logrus.Debugf("Evaluation Argvalue as a set: %d times\n", len(GetValueSlice(argValue)))
setResult := MakeValueSet()
setResult.GetSet().Value = evalTransformUsingValueSet(ee, x.Transform, assign, GetValueSlice(argValue))
return setResult
default:
logrus.Debugf("Evaluation Argvalue as a list: %d times\n", len(GetValueSlice(argValue)))
listResult := MakeValueList()
listResult.GetList().Value = evalTransformUsingValueList(ee, x.Transform, assign, GetValueSlice(argValue))
return listResult
}
default:
// HACK: scopevar == '.', then we are not unpacking the map entries
scopeVar := x.Transform.Scopevar
if argValue.GetMap() != nil && scopeVar != "." {
// TODO: add check that return type is defined as 'set of ...'
resultList := &sysl.Value_List{}
// Sort keys, to get stable output
var keys []string
for key := range argValue.GetMap().Items {
keys = append(keys, key)
}
sort.Strings(keys)
items := argValue.GetMap().Items
for _, key := range keys {
item := items[key]
logrus.Debugf("Evaluation Argvalue %s", key)
a := MakeValueMap()
logrus.Tracef("Evaluation Argvalue as a map: key=(%s), value=(%v)\n", key, item)
AddItemToValueMap(a, "key", MakeValueString(key))
AddItemToValueMap(a, "value", item)
assign[scopeVar] = a
res := evalTransformStmts(ee, assign, x.Transform)
AppendItemToValueList(resultList, res)
}
delete(assign, scopeVar)
if e.Type.GetSet() != nil {
return &sysl.Value{
Value: &sysl.Value_Set{
Set: resultList,
},
}
}
return &sysl.Value{
Value: &sysl.Value_List_{
List: resultList,
},
}
}
logrus.Tracef("Argvalue: %v", argValue)
assign[scopeVar] = argValue
res := evalTransformStmts(ee, assign, x.Transform)
delete(assign, scopeVar)
logrus.Tracef("Transform Result: %v", res)
return res
}
}
func evalCall(ee *exprEval, assign Scope, x *sysl.Expr_Call_) *sysl.Value {
if callTransform, has := ee.txApp.Views[x.Call.Func]; has {
logrus.Debugf("Calling View %s", x.Call.Func)
params := callTransform.Param
if len(params) != len(x.Call.Arg) {
logrus.Warnf("Skipping Calling func(%s), args mismatch, %d args passed, %d required\n",
x.Call.Func, len(x.Call.Arg), len(params))
return nil
}
callScope := make(Scope)
for i, argExpr := range x.Call.Arg {
// TODO: Add type checks
callScope[params[i].Name] = Eval(ee, assign, argExpr)
}
if callTransform.Expr.Type == nil {
callTransform.Expr.Type = callTransform.RetType
}
return Eval(ee, callScope, callTransform.Expr)
} else if strings.HasPrefix(x.Call.Func, ".") {
switch x.Call.Func[1:] {
case "count":
argExpr := Eval(ee, assign, x.Call.Arg[0])
switch t := argExpr.Value.(type) {
case *sysl.Value_List_:
return MakeValueI64(int64(len(t.List.Value)))
case *sysl.Value_Set:
return MakeValueI64(int64(len(t.Set.Value)))
case *sysl.Value_Map_:
return MakeValueI64(int64(len(t.Map.Items)))
default:
panic(errors.Errorf("Unexpected arg type: %v", x.Call.Arg))
}
default:
panic(errors.Errorf("Unimplemented function: %s", x.Call.Func))
}
}
list := MakeValueList()
for _, argExpr := range x.Call.Arg {
AppendItemToValueList(list.GetList(), Eval(ee, assign, argExpr))
}
return evalGoFunc(x.Call.Func, list)
}
// isInternalMap checks if this Value is created inplicitly inside evalTransform()
func isInternalMap(val *sysl.Value_Map) bool {
founds := 0
for key := range val.Items {
switch key {
case "key", "value":
founds++
default:
return false
}
}
return founds == 2
}
func evalName(ee *exprEval, assign Scope, x *sysl.Expr_Name) *sysl.Value {
val, has := assign[x.Name]
if !has {
switch x.Name {
case parse.TemplateImpliedResult:
val = MakeValueString("")
assign[x.Name] = val
case parse.TemplateLogString:
val = MakeValueString("")
default:
ee.LogEntry().Errorf("Key: %s does not exist in scope", x.Name)
}
}
return val
}
func evalGetAttr(ee *exprEval, assign Scope, x *sysl.Expr_GetAttr_) *sysl.Value {
entry := ee.LogEntry()
arg := Eval(ee, assign, x.GetAttr.Arg)
if arg.GetMap() == nil {
panic(errors.Errorf("%v", arg))
}
if isInternalMap(arg.GetMap()) {
switch key := x.GetAttr.Attr; key {
case "value":
ee.LogEntry().Debugf("Unnecessary use of .value")
fallthrough
case "key":
return arg.GetMap().Items[key]
}
arg = arg.GetMap().Items["value"]
}
val, has := arg.GetMap().Items[x.GetAttr.Attr]
entry.Tracef("GetAttribute: %v result: %v: ", has, val)
if !has {
entry.Warnf("Failed to get key: %s. Map has following keys:", x.GetAttr.Attr)
for key := range arg.GetMap().Items {
entry.Warnf("\t%s", key)
}
return &sysl.Value{
Value: &sysl.Value_Null_{
Null: &sysl.Value_Null{},
},
}
}
return val
}
func evalIfelse(ee *exprEval, assign Scope, x *sysl.Expr_Ifelse) *sysl.Value {
cond := Eval(ee, assign, x.Ifelse.Cond)
if cond.GetB() {
return Eval(ee, assign, x.Ifelse.IfTrue)
}
return Eval(ee, assign, x.Ifelse.IfFalse)
}
func evalSet(ee *exprEval, assign Scope, x *sysl.Expr_Set) *sysl.Value {
{
setResult := MakeValueSet()
for _, s := range x.Set.Expr {
AppendItemToValueList(setResult.GetSet(), Eval(ee, assign, s))
}
return setResult
}
}
func evalList(ee *exprEval, assign Scope, x *sysl.Expr_List_) *sysl.Value {
{
listResult := MakeValueList()
for _, s := range x.List.Expr {
AppendItemToValueList(listResult.GetList(), Eval(ee, assign, s))
}
return listResult
}
}
var EnableDebugger = false
func EvaluateApp(app *sysl.Application, view *sysl.View, s Scope) *sysl.Value {
ee := exprEval{
txApp: app,
exprStack: exprStack{},
logger: logrus.StandardLogger(),
}
if EnableDebugger {
ee.dbg = NewREPL(os.Stdin, os.Stdout)
}
val, err := ee.eval(s, view.Expr)
logrus.Tracef("EvaluateApp val: %s", val.String())
if err != nil {
logrus.Panic(err.Error())
}
return val
}
// EvaluateView evaluate the view using the Scope
func EvaluateView(mod *sysl.Module, appName, viewName string, s Scope) *sysl.Value {
txApp := mod.Apps[appName]
view := txApp.Views[viewName]
if view.Expr.Type == nil {
view.Expr.Type = view.RetType
}
return EvaluateApp(txApp, view, s)
}
type exprEval struct {
txApp *sysl.Application
exprStack exprStack
logger *logrus.Logger
dbg DebugFunc
}
func logentry(logger *logrus.Logger, expr *sysl.Expr) *logrus.Entry {
if expr.SourceContext == nil {
return logger.WithFields(logrus.Fields{})
}
fields := logrus.Fields{
"filename": expr.SourceContext.File,
"start": fmt.Sprintf("%d:%d", expr.SourceContext.Start.Line, expr.SourceContext.Start.Col),
"end": fmt.Sprintf("%d:%d", expr.SourceContext.End.Line, expr.SourceContext.End.Col),
}
if expr.SourceContext.Text != "" {
fields["text"] = expr.SourceContext.Text
}
return logger.WithFields(fields)
}
func (ee *exprEval) LogEntry() *logrus.Entry {
return logentry(ee.logger, ee.exprStack.Peek().e)
}
func (ee *exprEval) handlePanic() {
if r := recover(); r != nil {
ee.logger.Errorf("Evaluation Failed: ")
stack := ee.exprStack.s
for i := len(stack) - 1; i >= 0; i-- {
logentry(ee.logger, stack[i].e).Errorf("... %s", getExprText(stack[i].e))
}
if ee.dbg == nil {
os.Exit(1)
}
}
}
func (ee *exprEval) eval(scope Scope, expr *sysl.Expr) (val *sysl.Value, err error) {
entry := logentry(ee.logger, expr)
entry.Tracef("Entering: %s", getExprText(expr))
if ee.dbg != nil {
if err := ee.dbg(&scope, ee.txApp, expr); err != nil {
ee.logger.Warnf("REPL error: %s", err.Error())
ee.dbg = nil
}
}
ee.exprStack.Push(scope, expr)
defer ee.exprStack.Pop()
defer ee.handlePanic()
switch e := expr.Expr.(type) {
case *sysl.Expr_Transform_:
val = ee.evalTransform(scope, e, expr)
case *sysl.Expr_Binexpr:
val = evalBinExpr(ee, scope, e.Binexpr)
case *sysl.Expr_Call_:
val = evalCall(ee, scope, e)
case *sysl.Expr_Name:
val = evalName(ee, scope, e)
case *sysl.Expr_GetAttr_:
val = evalGetAttr(ee, scope, e)
case *sysl.Expr_Ifelse:
val = evalIfelse(ee, scope, e)
case *sysl.Expr_Literal:
val = e.Literal
case *sysl.Expr_Set:
val = evalSet(ee, scope, e)
case *sysl.Expr_List_:
val = evalList(ee, scope, e)
case *sysl.Expr_Unexpr:
val, err = ee.eval(scope, e.Unexpr.Arg)
if err != nil {
return nil, err
}
val = evalUnaryFunc(e.Unexpr.Op, val)
default:
return nil, fmt.Errorf("unhandled sysl.Expr type '%s' @ %s:%d:%d",
reflect.TypeOf(expr.Expr).String(),
expr.SourceContext.File, expr.SourceContext.Start.Line, expr.SourceContext.Start.Col)
}
entry.Tracef("Result: %s", val.String())
return val, err
}