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Commit | Line | Data |
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1 | package json | |
2 | ||
3 | import ( | |
4 | "fmt" | |
5 | ||
6 | "github.com/hashicorp/hcl2/hcl" | |
7 | "github.com/hashicorp/hcl2/hcl/hclsyntax" | |
8 | "github.com/zclconf/go-cty/cty" | |
9 | "github.com/zclconf/go-cty/cty/convert" | |
10 | ) | |
11 | ||
12 | // body is the implementation of "Body" used for files processed with the JSON | |
13 | // parser. | |
14 | type body struct { | |
15 | val node | |
16 | ||
17 | // If non-nil, the keys of this map cause the corresponding attributes to | |
18 | // be treated as non-existing. This is used when Body.PartialContent is | |
19 | // called, to produce the "remaining content" Body. | |
20 | hiddenAttrs map[string]struct{} | |
21 | } | |
22 | ||
23 | // expression is the implementation of "Expression" used for files processed | |
24 | // with the JSON parser. | |
25 | type expression struct { | |
26 | src node | |
27 | } | |
28 | ||
29 | func (b *body) Content(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Diagnostics) { | |
30 | content, newBody, diags := b.PartialContent(schema) | |
31 | ||
32 | hiddenAttrs := newBody.(*body).hiddenAttrs | |
33 | ||
34 | var nameSuggestions []string | |
35 | for _, attrS := range schema.Attributes { | |
36 | if _, ok := hiddenAttrs[attrS.Name]; !ok { | |
37 | // Only suggest an attribute name if we didn't use it already. | |
38 | nameSuggestions = append(nameSuggestions, attrS.Name) | |
39 | } | |
40 | } | |
41 | for _, blockS := range schema.Blocks { | |
42 | // Blocks can appear multiple times, so we'll suggest their type | |
43 | // names regardless of whether they've already been used. | |
44 | nameSuggestions = append(nameSuggestions, blockS.Type) | |
45 | } | |
46 | ||
47 | jsonAttrs, attrDiags := b.collectDeepAttrs(b.val, nil) | |
48 | diags = append(diags, attrDiags...) | |
49 | ||
50 | for _, attr := range jsonAttrs { | |
51 | k := attr.Name | |
52 | if k == "//" { | |
53 | // Ignore "//" keys in objects representing bodies, to allow | |
54 | // their use as comments. | |
55 | continue | |
56 | } | |
57 | ||
58 | if _, ok := hiddenAttrs[k]; !ok { | |
59 | suggestion := nameSuggestion(k, nameSuggestions) | |
60 | if suggestion != "" { | |
61 | suggestion = fmt.Sprintf(" Did you mean %q?", suggestion) | |
62 | } | |
63 | ||
64 | diags = append(diags, &hcl.Diagnostic{ | |
65 | Severity: hcl.DiagError, | |
66 | Summary: "Extraneous JSON object property", | |
67 | Detail: fmt.Sprintf("No argument or block type is named %q.%s", k, suggestion), | |
68 | Subject: &attr.NameRange, | |
69 | Context: attr.Range().Ptr(), | |
70 | }) | |
71 | } | |
72 | } | |
73 | ||
74 | return content, diags | |
75 | } | |
76 | ||
77 | func (b *body) PartialContent(schema *hcl.BodySchema) (*hcl.BodyContent, hcl.Body, hcl.Diagnostics) { | |
78 | var diags hcl.Diagnostics | |
79 | ||
80 | jsonAttrs, attrDiags := b.collectDeepAttrs(b.val, nil) | |
81 | diags = append(diags, attrDiags...) | |
82 | ||
83 | usedNames := map[string]struct{}{} | |
84 | if b.hiddenAttrs != nil { | |
85 | for k := range b.hiddenAttrs { | |
86 | usedNames[k] = struct{}{} | |
87 | } | |
88 | } | |
89 | ||
90 | content := &hcl.BodyContent{ | |
91 | Attributes: map[string]*hcl.Attribute{}, | |
92 | Blocks: nil, | |
93 | ||
94 | MissingItemRange: b.MissingItemRange(), | |
95 | } | |
96 | ||
97 | // Create some more convenient data structures for our work below. | |
98 | attrSchemas := map[string]hcl.AttributeSchema{} | |
99 | blockSchemas := map[string]hcl.BlockHeaderSchema{} | |
100 | for _, attrS := range schema.Attributes { | |
101 | attrSchemas[attrS.Name] = attrS | |
102 | } | |
103 | for _, blockS := range schema.Blocks { | |
104 | blockSchemas[blockS.Type] = blockS | |
105 | } | |
106 | ||
107 | for _, jsonAttr := range jsonAttrs { | |
108 | attrName := jsonAttr.Name | |
109 | if _, used := b.hiddenAttrs[attrName]; used { | |
110 | continue | |
111 | } | |
112 | ||
113 | if attrS, defined := attrSchemas[attrName]; defined { | |
114 | if existing, exists := content.Attributes[attrName]; exists { | |
115 | diags = append(diags, &hcl.Diagnostic{ | |
116 | Severity: hcl.DiagError, | |
117 | Summary: "Duplicate argument", | |
118 | Detail: fmt.Sprintf("The argument %q was already set at %s.", attrName, existing.Range), | |
119 | Subject: &jsonAttr.NameRange, | |
120 | Context: jsonAttr.Range().Ptr(), | |
121 | }) | |
122 | continue | |
123 | } | |
124 | ||
125 | content.Attributes[attrS.Name] = &hcl.Attribute{ | |
126 | Name: attrS.Name, | |
127 | Expr: &expression{src: jsonAttr.Value}, | |
128 | Range: hcl.RangeBetween(jsonAttr.NameRange, jsonAttr.Value.Range()), | |
129 | NameRange: jsonAttr.NameRange, | |
130 | } | |
131 | usedNames[attrName] = struct{}{} | |
132 | ||
133 | } else if blockS, defined := blockSchemas[attrName]; defined { | |
134 | bv := jsonAttr.Value | |
135 | blockDiags := b.unpackBlock(bv, blockS.Type, &jsonAttr.NameRange, blockS.LabelNames, nil, nil, &content.Blocks) | |
136 | diags = append(diags, blockDiags...) | |
137 | usedNames[attrName] = struct{}{} | |
138 | } | |
139 | ||
140 | // We ignore anything that isn't defined because that's the | |
141 | // PartialContent contract. The Content method will catch leftovers. | |
142 | } | |
143 | ||
144 | // Make sure we got all the required attributes. | |
145 | for _, attrS := range schema.Attributes { | |
146 | if !attrS.Required { | |
147 | continue | |
148 | } | |
149 | if _, defined := content.Attributes[attrS.Name]; !defined { | |
150 | diags = append(diags, &hcl.Diagnostic{ | |
151 | Severity: hcl.DiagError, | |
152 | Summary: "Missing required argument", | |
153 | Detail: fmt.Sprintf("The argument %q is required, but no definition was found.", attrS.Name), | |
154 | Subject: b.MissingItemRange().Ptr(), | |
155 | }) | |
156 | } | |
157 | } | |
158 | ||
159 | unusedBody := &body{ | |
160 | val: b.val, | |
161 | hiddenAttrs: usedNames, | |
162 | } | |
163 | ||
164 | return content, unusedBody, diags | |
165 | } | |
166 | ||
167 | // JustAttributes for JSON bodies interprets all properties of the wrapped | |
168 | // JSON object as attributes and returns them. | |
169 | func (b *body) JustAttributes() (hcl.Attributes, hcl.Diagnostics) { | |
170 | var diags hcl.Diagnostics | |
171 | attrs := make(map[string]*hcl.Attribute) | |
172 | ||
173 | obj, ok := b.val.(*objectVal) | |
174 | if !ok { | |
175 | diags = append(diags, &hcl.Diagnostic{ | |
176 | Severity: hcl.DiagError, | |
177 | Summary: "Incorrect JSON value type", | |
178 | Detail: "A JSON object is required here, setting the arguments for this block.", | |
179 | Subject: b.val.StartRange().Ptr(), | |
180 | }) | |
181 | return attrs, diags | |
182 | } | |
183 | ||
184 | for _, jsonAttr := range obj.Attrs { | |
185 | name := jsonAttr.Name | |
186 | if name == "//" { | |
187 | // Ignore "//" keys in objects representing bodies, to allow | |
188 | // their use as comments. | |
189 | continue | |
190 | } | |
191 | ||
192 | if _, hidden := b.hiddenAttrs[name]; hidden { | |
193 | continue | |
194 | } | |
195 | ||
196 | if existing, exists := attrs[name]; exists { | |
197 | diags = append(diags, &hcl.Diagnostic{ | |
198 | Severity: hcl.DiagError, | |
199 | Summary: "Duplicate attribute definition", | |
200 | Detail: fmt.Sprintf("The argument %q was already set at %s.", name, existing.Range), | |
201 | Subject: &jsonAttr.NameRange, | |
202 | }) | |
203 | continue | |
204 | } | |
205 | ||
206 | attrs[name] = &hcl.Attribute{ | |
207 | Name: name, | |
208 | Expr: &expression{src: jsonAttr.Value}, | |
209 | Range: hcl.RangeBetween(jsonAttr.NameRange, jsonAttr.Value.Range()), | |
210 | NameRange: jsonAttr.NameRange, | |
211 | } | |
212 | } | |
213 | ||
214 | // No diagnostics possible here, since the parser already took care of | |
215 | // finding duplicates and every JSON value can be a valid attribute value. | |
216 | return attrs, diags | |
217 | } | |
218 | ||
219 | func (b *body) MissingItemRange() hcl.Range { | |
220 | switch tv := b.val.(type) { | |
221 | case *objectVal: | |
222 | return tv.CloseRange | |
223 | case *arrayVal: | |
224 | return tv.OpenRange | |
225 | default: | |
226 | // Should not happen in correct operation, but might show up if the | |
227 | // input is invalid and we are producing partial results. | |
228 | return tv.StartRange() | |
229 | } | |
230 | } | |
231 | ||
232 | func (b *body) unpackBlock(v node, typeName string, typeRange *hcl.Range, labelsLeft []string, labelsUsed []string, labelRanges []hcl.Range, blocks *hcl.Blocks) (diags hcl.Diagnostics) { | |
233 | if len(labelsLeft) > 0 { | |
234 | labelName := labelsLeft[0] | |
235 | jsonAttrs, attrDiags := b.collectDeepAttrs(v, &labelName) | |
236 | diags = append(diags, attrDiags...) | |
237 | ||
238 | if len(jsonAttrs) == 0 { | |
239 | diags = diags.Append(&hcl.Diagnostic{ | |
240 | Severity: hcl.DiagError, | |
241 | Summary: "Missing block label", | |
242 | Detail: fmt.Sprintf("At least one object property is required, whose name represents the %s block's %s.", typeName, labelName), | |
243 | Subject: v.StartRange().Ptr(), | |
244 | }) | |
245 | return | |
246 | } | |
247 | labelsUsed := append(labelsUsed, "") | |
248 | labelRanges := append(labelRanges, hcl.Range{}) | |
249 | for _, p := range jsonAttrs { | |
250 | pk := p.Name | |
251 | labelsUsed[len(labelsUsed)-1] = pk | |
252 | labelRanges[len(labelRanges)-1] = p.NameRange | |
253 | diags = append(diags, b.unpackBlock(p.Value, typeName, typeRange, labelsLeft[1:], labelsUsed, labelRanges, blocks)...) | |
254 | } | |
255 | return | |
256 | } | |
257 | ||
258 | // By the time we get here, we've peeled off all the labels and we're ready | |
259 | // to deal with the block's actual content. | |
260 | ||
261 | // need to copy the label slices because their underlying arrays will | |
262 | // continue to be mutated after we return. | |
263 | labels := make([]string, len(labelsUsed)) | |
264 | copy(labels, labelsUsed) | |
265 | labelR := make([]hcl.Range, len(labelRanges)) | |
266 | copy(labelR, labelRanges) | |
267 | ||
268 | switch tv := v.(type) { | |
269 | case *nullVal: | |
270 | // There is no block content, e.g the value is null. | |
271 | return | |
272 | case *objectVal: | |
273 | // Single instance of the block | |
274 | *blocks = append(*blocks, &hcl.Block{ | |
275 | Type: typeName, | |
276 | Labels: labels, | |
277 | Body: &body{ | |
278 | val: tv, | |
279 | }, | |
280 | ||
281 | DefRange: tv.OpenRange, | |
282 | TypeRange: *typeRange, | |
283 | LabelRanges: labelR, | |
284 | }) | |
285 | case *arrayVal: | |
286 | // Multiple instances of the block | |
287 | for _, av := range tv.Values { | |
288 | *blocks = append(*blocks, &hcl.Block{ | |
289 | Type: typeName, | |
290 | Labels: labels, | |
291 | Body: &body{ | |
292 | val: av, // might be mistyped; we'll find out when content is requested for this body | |
293 | }, | |
294 | ||
295 | DefRange: tv.OpenRange, | |
296 | TypeRange: *typeRange, | |
297 | LabelRanges: labelR, | |
298 | }) | |
299 | } | |
300 | default: | |
301 | diags = diags.Append(&hcl.Diagnostic{ | |
302 | Severity: hcl.DiagError, | |
303 | Summary: "Incorrect JSON value type", | |
304 | Detail: fmt.Sprintf("Either a JSON object or a JSON array is required, representing the contents of one or more %q blocks.", typeName), | |
305 | Subject: v.StartRange().Ptr(), | |
306 | }) | |
307 | } | |
308 | return | |
309 | } | |
310 | ||
311 | // collectDeepAttrs takes either a single object or an array of objects and | |
312 | // flattens it into a list of object attributes, collecting attributes from | |
313 | // all of the objects in a given array. | |
314 | // | |
315 | // Ordering is preserved, so a list of objects that each have one property | |
316 | // will result in those properties being returned in the same order as the | |
317 | // objects appeared in the array. | |
318 | // | |
319 | // This is appropriate for use only for objects representing bodies or labels | |
320 | // within a block. | |
321 | // | |
322 | // The labelName argument, if non-null, is used to tailor returned error | |
323 | // messages to refer to block labels rather than attributes and child blocks. | |
324 | // It has no other effect. | |
325 | func (b *body) collectDeepAttrs(v node, labelName *string) ([]*objectAttr, hcl.Diagnostics) { | |
326 | var diags hcl.Diagnostics | |
327 | var attrs []*objectAttr | |
328 | ||
329 | switch tv := v.(type) { | |
330 | case *nullVal: | |
331 | // If a value is null, then we don't return any attributes or return an error. | |
332 | ||
333 | case *objectVal: | |
334 | attrs = append(attrs, tv.Attrs...) | |
335 | ||
336 | case *arrayVal: | |
337 | for _, ev := range tv.Values { | |
338 | switch tev := ev.(type) { | |
339 | case *objectVal: | |
340 | attrs = append(attrs, tev.Attrs...) | |
341 | default: | |
342 | if labelName != nil { | |
343 | diags = append(diags, &hcl.Diagnostic{ | |
344 | Severity: hcl.DiagError, | |
345 | Summary: "Incorrect JSON value type", | |
346 | Detail: fmt.Sprintf("A JSON object is required here, to specify %s labels for this block.", *labelName), | |
347 | Subject: ev.StartRange().Ptr(), | |
348 | }) | |
349 | } else { | |
350 | diags = append(diags, &hcl.Diagnostic{ | |
351 | Severity: hcl.DiagError, | |
352 | Summary: "Incorrect JSON value type", | |
353 | Detail: "A JSON object is required here, to define arguments and child blocks.", | |
354 | Subject: ev.StartRange().Ptr(), | |
355 | }) | |
356 | } | |
357 | } | |
358 | } | |
359 | ||
360 | default: | |
361 | if labelName != nil { | |
362 | diags = append(diags, &hcl.Diagnostic{ | |
363 | Severity: hcl.DiagError, | |
364 | Summary: "Incorrect JSON value type", | |
365 | Detail: fmt.Sprintf("Either a JSON object or JSON array of objects is required here, to specify %s labels for this block.", *labelName), | |
366 | Subject: v.StartRange().Ptr(), | |
367 | }) | |
368 | } else { | |
369 | diags = append(diags, &hcl.Diagnostic{ | |
370 | Severity: hcl.DiagError, | |
371 | Summary: "Incorrect JSON value type", | |
372 | Detail: "Either a JSON object or JSON array of objects is required here, to define arguments and child blocks.", | |
373 | Subject: v.StartRange().Ptr(), | |
374 | }) | |
375 | } | |
376 | } | |
377 | ||
378 | return attrs, diags | |
379 | } | |
380 | ||
381 | func (e *expression) Value(ctx *hcl.EvalContext) (cty.Value, hcl.Diagnostics) { | |
382 | switch v := e.src.(type) { | |
383 | case *stringVal: | |
384 | if ctx != nil { | |
385 | // Parse string contents as a HCL native language expression. | |
386 | // We only do this if we have a context, so passing a nil context | |
387 | // is how the caller specifies that interpolations are not allowed | |
388 | // and that the string should just be returned verbatim. | |
389 | templateSrc := v.Value | |
390 | expr, diags := hclsyntax.ParseTemplate( | |
391 | []byte(templateSrc), | |
392 | v.SrcRange.Filename, | |
393 | ||
394 | // This won't produce _exactly_ the right result, since | |
395 | // the hclsyntax parser can't "see" any escapes we removed | |
396 | // while parsing JSON, but it's better than nothing. | |
397 | hcl.Pos{ | |
398 | Line: v.SrcRange.Start.Line, | |
399 | ||
400 | // skip over the opening quote mark | |
401 | Byte: v.SrcRange.Start.Byte + 1, | |
402 | Column: v.SrcRange.Start.Column + 1, | |
403 | }, | |
404 | ) | |
405 | if diags.HasErrors() { | |
406 | return cty.DynamicVal, diags | |
407 | } | |
408 | val, evalDiags := expr.Value(ctx) | |
409 | diags = append(diags, evalDiags...) | |
410 | return val, diags | |
411 | } | |
412 | ||
413 | return cty.StringVal(v.Value), nil | |
414 | case *numberVal: | |
415 | return cty.NumberVal(v.Value), nil | |
416 | case *booleanVal: | |
417 | return cty.BoolVal(v.Value), nil | |
418 | case *arrayVal: | |
419 | vals := []cty.Value{} | |
420 | for _, jsonVal := range v.Values { | |
421 | val, _ := (&expression{src: jsonVal}).Value(ctx) | |
422 | vals = append(vals, val) | |
423 | } | |
424 | return cty.TupleVal(vals), nil | |
425 | case *objectVal: | |
426 | var diags hcl.Diagnostics | |
427 | attrs := map[string]cty.Value{} | |
428 | attrRanges := map[string]hcl.Range{} | |
429 | known := true | |
430 | for _, jsonAttr := range v.Attrs { | |
431 | // In this one context we allow keys to contain interpolation | |
432 | // expressions too, assuming we're evaluating in interpolation | |
433 | // mode. This achieves parity with the native syntax where | |
434 | // object expressions can have dynamic keys, while block contents | |
435 | // may not. | |
436 | name, nameDiags := (&expression{src: &stringVal{ | |
437 | Value: jsonAttr.Name, | |
438 | SrcRange: jsonAttr.NameRange, | |
439 | }}).Value(ctx) | |
440 | valExpr := &expression{src: jsonAttr.Value} | |
441 | val, valDiags := valExpr.Value(ctx) | |
442 | diags = append(diags, nameDiags...) | |
443 | diags = append(diags, valDiags...) | |
444 | ||
445 | var err error | |
446 | name, err = convert.Convert(name, cty.String) | |
447 | if err != nil { | |
448 | diags = append(diags, &hcl.Diagnostic{ | |
449 | Severity: hcl.DiagError, | |
450 | Summary: "Invalid object key expression", | |
451 | Detail: fmt.Sprintf("Cannot use this expression as an object key: %s.", err), | |
452 | Subject: &jsonAttr.NameRange, | |
453 | Expression: valExpr, | |
454 | EvalContext: ctx, | |
455 | }) | |
456 | continue | |
457 | } | |
458 | if name.IsNull() { | |
459 | diags = append(diags, &hcl.Diagnostic{ | |
460 | Severity: hcl.DiagError, | |
461 | Summary: "Invalid object key expression", | |
462 | Detail: "Cannot use null value as an object key.", | |
463 | Subject: &jsonAttr.NameRange, | |
464 | Expression: valExpr, | |
465 | EvalContext: ctx, | |
466 | }) | |
467 | continue | |
468 | } | |
469 | if !name.IsKnown() { | |
470 | // This is a bit of a weird case, since our usual rules require | |
471 | // us to tolerate unknowns and just represent the result as | |
472 | // best we can but if we don't know the key then we can't | |
473 | // know the type of our object at all, and thus we must turn | |
474 | // the whole thing into cty.DynamicVal. This is consistent with | |
475 | // how this situation is handled in the native syntax. | |
476 | // We'll keep iterating so we can collect other errors in | |
477 | // subsequent attributes. | |
478 | known = false | |
479 | continue | |
480 | } | |
481 | nameStr := name.AsString() | |
482 | if _, defined := attrs[nameStr]; defined { | |
483 | diags = append(diags, &hcl.Diagnostic{ | |
484 | Severity: hcl.DiagError, | |
485 | Summary: "Duplicate object attribute", | |
486 | Detail: fmt.Sprintf("An attribute named %q was already defined at %s.", nameStr, attrRanges[nameStr]), | |
487 | Subject: &jsonAttr.NameRange, | |
488 | Expression: e, | |
489 | EvalContext: ctx, | |
490 | }) | |
491 | continue | |
492 | } | |
493 | attrs[nameStr] = val | |
494 | attrRanges[nameStr] = jsonAttr.NameRange | |
495 | } | |
496 | if !known { | |
497 | // We encountered an unknown key somewhere along the way, so | |
498 | // we can't know what our type will eventually be. | |
499 | return cty.DynamicVal, diags | |
500 | } | |
501 | return cty.ObjectVal(attrs), diags | |
502 | case *nullVal: | |
503 | return cty.NullVal(cty.DynamicPseudoType), nil | |
504 | default: | |
505 | // Default to DynamicVal so that ASTs containing invalid nodes can | |
506 | // still be partially-evaluated. | |
507 | return cty.DynamicVal, nil | |
508 | } | |
509 | } | |
510 | ||
511 | func (e *expression) Variables() []hcl.Traversal { | |
512 | var vars []hcl.Traversal | |
513 | ||
514 | switch v := e.src.(type) { | |
515 | case *stringVal: | |
516 | templateSrc := v.Value | |
517 | expr, diags := hclsyntax.ParseTemplate( | |
518 | []byte(templateSrc), | |
519 | v.SrcRange.Filename, | |
520 | ||
521 | // This won't produce _exactly_ the right result, since | |
522 | // the hclsyntax parser can't "see" any escapes we removed | |
523 | // while parsing JSON, but it's better than nothing. | |
524 | hcl.Pos{ | |
525 | Line: v.SrcRange.Start.Line, | |
526 | ||
527 | // skip over the opening quote mark | |
528 | Byte: v.SrcRange.Start.Byte + 1, | |
529 | Column: v.SrcRange.Start.Column + 1, | |
530 | }, | |
531 | ) | |
532 | if diags.HasErrors() { | |
533 | return vars | |
534 | } | |
535 | return expr.Variables() | |
536 | ||
537 | case *arrayVal: | |
538 | for _, jsonVal := range v.Values { | |
539 | vars = append(vars, (&expression{src: jsonVal}).Variables()...) | |
540 | } | |
541 | case *objectVal: | |
542 | for _, jsonAttr := range v.Attrs { | |
543 | keyExpr := &stringVal{ // we're going to treat key as an expression in this context | |
544 | Value: jsonAttr.Name, | |
545 | SrcRange: jsonAttr.NameRange, | |
546 | } | |
547 | vars = append(vars, (&expression{src: keyExpr}).Variables()...) | |
548 | vars = append(vars, (&expression{src: jsonAttr.Value}).Variables()...) | |
549 | } | |
550 | } | |
551 | ||
552 | return vars | |
553 | } | |
554 | ||
555 | func (e *expression) Range() hcl.Range { | |
556 | return e.src.Range() | |
557 | } | |
558 | ||
559 | func (e *expression) StartRange() hcl.Range { | |
560 | return e.src.StartRange() | |
561 | } | |
562 | ||
563 | // Implementation for hcl.AbsTraversalForExpr. | |
564 | func (e *expression) AsTraversal() hcl.Traversal { | |
565 | // In JSON-based syntax a traversal is given as a string containing | |
566 | // traversal syntax as defined by hclsyntax.ParseTraversalAbs. | |
567 | ||
568 | switch v := e.src.(type) { | |
569 | case *stringVal: | |
570 | traversal, diags := hclsyntax.ParseTraversalAbs([]byte(v.Value), v.SrcRange.Filename, v.SrcRange.Start) | |
571 | if diags.HasErrors() { | |
572 | return nil | |
573 | } | |
574 | return traversal | |
575 | default: | |
576 | return nil | |
577 | } | |
578 | } | |
579 | ||
580 | // Implementation for hcl.ExprCall. | |
581 | func (e *expression) ExprCall() *hcl.StaticCall { | |
582 | // In JSON-based syntax a static call is given as a string containing | |
583 | // an expression in the native syntax that also supports ExprCall. | |
584 | ||
585 | switch v := e.src.(type) { | |
586 | case *stringVal: | |
587 | expr, diags := hclsyntax.ParseExpression([]byte(v.Value), v.SrcRange.Filename, v.SrcRange.Start) | |
588 | if diags.HasErrors() { | |
589 | return nil | |
590 | } | |
591 | ||
592 | call, diags := hcl.ExprCall(expr) | |
593 | if diags.HasErrors() { | |
594 | return nil | |
595 | } | |
596 | ||
597 | return call | |
598 | default: | |
599 | return nil | |
600 | } | |
601 | } | |
602 | ||
603 | // Implementation for hcl.ExprList. | |
604 | func (e *expression) ExprList() []hcl.Expression { | |
605 | switch v := e.src.(type) { | |
606 | case *arrayVal: | |
607 | ret := make([]hcl.Expression, len(v.Values)) | |
608 | for i, node := range v.Values { | |
609 | ret[i] = &expression{src: node} | |
610 | } | |
611 | return ret | |
612 | default: | |
613 | return nil | |
614 | } | |
615 | } | |
616 | ||
617 | // Implementation for hcl.ExprMap. | |
618 | func (e *expression) ExprMap() []hcl.KeyValuePair { | |
619 | switch v := e.src.(type) { | |
620 | case *objectVal: | |
621 | ret := make([]hcl.KeyValuePair, len(v.Attrs)) | |
622 | for i, jsonAttr := range v.Attrs { | |
623 | ret[i] = hcl.KeyValuePair{ | |
624 | Key: &expression{src: &stringVal{ | |
625 | Value: jsonAttr.Name, | |
626 | SrcRange: jsonAttr.NameRange, | |
627 | }}, | |
628 | Value: &expression{src: jsonAttr.Value}, | |
629 | } | |
630 | } | |
631 | return ret | |
632 | default: | |
633 | return nil | |
634 | } | |
635 | } |