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15c0b25d AP |
1 | package hclsyntax |
2 | ||
3 | import ( | |
4 | "bytes" | |
5 | "fmt" | |
6 | "strconv" | |
7 | "unicode/utf8" | |
8 | ||
9 | "github.com/apparentlymart/go-textseg/textseg" | |
10 | "github.com/hashicorp/hcl2/hcl" | |
11 | "github.com/zclconf/go-cty/cty" | |
15c0b25d AP |
12 | ) |
13 | ||
14 | type parser struct { | |
15 | *peeker | |
16 | ||
17 | // set to true if any recovery is attempted. The parser can use this | |
18 | // to attempt to reduce error noise by suppressing "bad token" errors | |
19 | // in recovery mode, assuming that the recovery heuristics have failed | |
20 | // in this case and left the peeker in a wrong place. | |
21 | recovery bool | |
22 | } | |
23 | ||
24 | func (p *parser) ParseBody(end TokenType) (*Body, hcl.Diagnostics) { | |
25 | attrs := Attributes{} | |
26 | blocks := Blocks{} | |
27 | var diags hcl.Diagnostics | |
28 | ||
29 | startRange := p.PrevRange() | |
30 | var endRange hcl.Range | |
31 | ||
32 | Token: | |
33 | for { | |
34 | next := p.Peek() | |
35 | if next.Type == end { | |
36 | endRange = p.NextRange() | |
37 | p.Read() | |
38 | break Token | |
39 | } | |
40 | ||
41 | switch next.Type { | |
42 | case TokenNewline: | |
43 | p.Read() | |
44 | continue | |
45 | case TokenIdent: | |
46 | item, itemDiags := p.ParseBodyItem() | |
47 | diags = append(diags, itemDiags...) | |
48 | switch titem := item.(type) { | |
49 | case *Block: | |
50 | blocks = append(blocks, titem) | |
51 | case *Attribute: | |
52 | if existing, exists := attrs[titem.Name]; exists { | |
53 | diags = append(diags, &hcl.Diagnostic{ | |
54 | Severity: hcl.DiagError, | |
55 | Summary: "Attribute redefined", | |
56 | Detail: fmt.Sprintf( | |
107c1cdb | 57 | "The argument %q was already set at %s. Each argument may be set only once.", |
15c0b25d AP |
58 | titem.Name, existing.NameRange.String(), |
59 | ), | |
60 | Subject: &titem.NameRange, | |
61 | }) | |
62 | } else { | |
63 | attrs[titem.Name] = titem | |
64 | } | |
65 | default: | |
66 | // This should never happen for valid input, but may if a | |
67 | // syntax error was detected in ParseBodyItem that prevented | |
68 | // it from even producing a partially-broken item. In that | |
69 | // case, it would've left at least one error in the diagnostics | |
70 | // slice we already dealt with above. | |
71 | // | |
72 | // We'll assume ParseBodyItem attempted recovery to leave | |
73 | // us in a reasonable position to try parsing the next item. | |
74 | continue | |
75 | } | |
76 | default: | |
77 | bad := p.Read() | |
78 | if !p.recovery { | |
79 | if bad.Type == TokenOQuote { | |
80 | diags = append(diags, &hcl.Diagnostic{ | |
81 | Severity: hcl.DiagError, | |
107c1cdb ND |
82 | Summary: "Invalid argument name", |
83 | Detail: "Argument names must not be quoted.", | |
15c0b25d AP |
84 | Subject: &bad.Range, |
85 | }) | |
86 | } else { | |
87 | diags = append(diags, &hcl.Diagnostic{ | |
88 | Severity: hcl.DiagError, | |
107c1cdb ND |
89 | Summary: "Argument or block definition required", |
90 | Detail: "An argument or block definition is required here.", | |
15c0b25d AP |
91 | Subject: &bad.Range, |
92 | }) | |
93 | } | |
94 | } | |
95 | endRange = p.PrevRange() // arbitrary, but somewhere inside the body means better diagnostics | |
96 | ||
97 | p.recover(end) // attempt to recover to the token after the end of this body | |
98 | break Token | |
99 | } | |
100 | } | |
101 | ||
102 | return &Body{ | |
103 | Attributes: attrs, | |
104 | Blocks: blocks, | |
105 | ||
106 | SrcRange: hcl.RangeBetween(startRange, endRange), | |
107 | EndRange: hcl.Range{ | |
108 | Filename: endRange.Filename, | |
109 | Start: endRange.End, | |
110 | End: endRange.End, | |
111 | }, | |
112 | }, diags | |
113 | } | |
114 | ||
115 | func (p *parser) ParseBodyItem() (Node, hcl.Diagnostics) { | |
116 | ident := p.Read() | |
117 | if ident.Type != TokenIdent { | |
118 | p.recoverAfterBodyItem() | |
119 | return nil, hcl.Diagnostics{ | |
120 | { | |
121 | Severity: hcl.DiagError, | |
107c1cdb ND |
122 | Summary: "Argument or block definition required", |
123 | Detail: "An argument or block definition is required here.", | |
15c0b25d AP |
124 | Subject: &ident.Range, |
125 | }, | |
126 | } | |
127 | } | |
128 | ||
129 | next := p.Peek() | |
130 | ||
131 | switch next.Type { | |
132 | case TokenEqual: | |
107c1cdb | 133 | return p.finishParsingBodyAttribute(ident, false) |
15c0b25d AP |
134 | case TokenOQuote, TokenOBrace, TokenIdent: |
135 | return p.finishParsingBodyBlock(ident) | |
136 | default: | |
137 | p.recoverAfterBodyItem() | |
138 | return nil, hcl.Diagnostics{ | |
139 | { | |
140 | Severity: hcl.DiagError, | |
107c1cdb ND |
141 | Summary: "Argument or block definition required", |
142 | Detail: "An argument or block definition is required here. To set an argument, use the equals sign \"=\" to introduce the argument value.", | |
15c0b25d AP |
143 | Subject: &ident.Range, |
144 | }, | |
145 | } | |
146 | } | |
147 | ||
148 | return nil, nil | |
149 | } | |
150 | ||
107c1cdb ND |
151 | // parseSingleAttrBody is a weird variant of ParseBody that deals with the |
152 | // body of a nested block containing only one attribute value all on a single | |
153 | // line, like foo { bar = baz } . It expects to find a single attribute item | |
154 | // immediately followed by the end token type with no intervening newlines. | |
155 | func (p *parser) parseSingleAttrBody(end TokenType) (*Body, hcl.Diagnostics) { | |
156 | ident := p.Read() | |
157 | if ident.Type != TokenIdent { | |
158 | p.recoverAfterBodyItem() | |
159 | return nil, hcl.Diagnostics{ | |
160 | { | |
161 | Severity: hcl.DiagError, | |
162 | Summary: "Argument or block definition required", | |
163 | Detail: "An argument or block definition is required here.", | |
164 | Subject: &ident.Range, | |
165 | }, | |
166 | } | |
167 | } | |
168 | ||
169 | var attr *Attribute | |
170 | var diags hcl.Diagnostics | |
171 | ||
172 | next := p.Peek() | |
173 | ||
174 | switch next.Type { | |
175 | case TokenEqual: | |
176 | node, attrDiags := p.finishParsingBodyAttribute(ident, true) | |
177 | diags = append(diags, attrDiags...) | |
178 | attr = node.(*Attribute) | |
179 | case TokenOQuote, TokenOBrace, TokenIdent: | |
180 | p.recoverAfterBodyItem() | |
181 | return nil, hcl.Diagnostics{ | |
182 | { | |
183 | Severity: hcl.DiagError, | |
184 | Summary: "Argument definition required", | |
185 | Detail: fmt.Sprintf("A single-line block definition can contain only a single argument. If you meant to define argument %q, use an equals sign to assign it a value. To define a nested block, place it on a line of its own within its parent block.", ident.Bytes), | |
186 | Subject: hcl.RangeBetween(ident.Range, next.Range).Ptr(), | |
187 | }, | |
188 | } | |
189 | default: | |
190 | p.recoverAfterBodyItem() | |
191 | return nil, hcl.Diagnostics{ | |
192 | { | |
193 | Severity: hcl.DiagError, | |
194 | Summary: "Argument or block definition required", | |
195 | Detail: "An argument or block definition is required here. To set an argument, use the equals sign \"=\" to introduce the argument value.", | |
196 | Subject: &ident.Range, | |
197 | }, | |
198 | } | |
199 | } | |
200 | ||
201 | return &Body{ | |
202 | Attributes: Attributes{ | |
203 | string(ident.Bytes): attr, | |
204 | }, | |
205 | ||
206 | SrcRange: attr.SrcRange, | |
207 | EndRange: hcl.Range{ | |
208 | Filename: attr.SrcRange.Filename, | |
209 | Start: attr.SrcRange.End, | |
210 | End: attr.SrcRange.End, | |
211 | }, | |
212 | }, diags | |
213 | ||
214 | } | |
215 | ||
216 | func (p *parser) finishParsingBodyAttribute(ident Token, singleLine bool) (Node, hcl.Diagnostics) { | |
15c0b25d AP |
217 | eqTok := p.Read() // eat equals token |
218 | if eqTok.Type != TokenEqual { | |
219 | // should never happen if caller behaves | |
220 | panic("finishParsingBodyAttribute called with next not equals") | |
221 | } | |
222 | ||
223 | var endRange hcl.Range | |
224 | ||
225 | expr, diags := p.ParseExpression() | |
226 | if p.recovery && diags.HasErrors() { | |
227 | // recovery within expressions tends to be tricky, so we've probably | |
228 | // landed somewhere weird. We'll try to reset to the start of a body | |
229 | // item so parsing can continue. | |
230 | endRange = p.PrevRange() | |
231 | p.recoverAfterBodyItem() | |
232 | } else { | |
107c1cdb ND |
233 | endRange = p.PrevRange() |
234 | if !singleLine { | |
235 | end := p.Peek() | |
236 | if end.Type != TokenNewline && end.Type != TokenEOF { | |
237 | if !p.recovery { | |
238 | summary := "Missing newline after argument" | |
239 | detail := "An argument definition must end with a newline." | |
240 | ||
241 | if end.Type == TokenComma { | |
242 | summary = "Unexpected comma after argument" | |
243 | detail = "Argument definitions must be separated by newlines, not commas. " + detail | |
244 | } | |
245 | ||
246 | diags = append(diags, &hcl.Diagnostic{ | |
247 | Severity: hcl.DiagError, | |
248 | Summary: summary, | |
249 | Detail: detail, | |
250 | Subject: &end.Range, | |
251 | Context: hcl.RangeBetween(ident.Range, end.Range).Ptr(), | |
252 | }) | |
253 | } | |
254 | endRange = p.PrevRange() | |
255 | p.recoverAfterBodyItem() | |
256 | } else { | |
257 | endRange = p.PrevRange() | |
258 | p.Read() // eat newline | |
15c0b25d | 259 | } |
15c0b25d AP |
260 | } |
261 | } | |
262 | ||
263 | return &Attribute{ | |
264 | Name: string(ident.Bytes), | |
265 | Expr: expr, | |
266 | ||
267 | SrcRange: hcl.RangeBetween(ident.Range, endRange), | |
268 | NameRange: ident.Range, | |
269 | EqualsRange: eqTok.Range, | |
270 | }, diags | |
271 | } | |
272 | ||
273 | func (p *parser) finishParsingBodyBlock(ident Token) (Node, hcl.Diagnostics) { | |
274 | var blockType = string(ident.Bytes) | |
275 | var diags hcl.Diagnostics | |
276 | var labels []string | |
277 | var labelRanges []hcl.Range | |
278 | ||
279 | var oBrace Token | |
280 | ||
281 | Token: | |
282 | for { | |
283 | tok := p.Peek() | |
284 | ||
285 | switch tok.Type { | |
286 | ||
287 | case TokenOBrace: | |
288 | oBrace = p.Read() | |
289 | break Token | |
290 | ||
291 | case TokenOQuote: | |
292 | label, labelRange, labelDiags := p.parseQuotedStringLiteral() | |
293 | diags = append(diags, labelDiags...) | |
294 | labels = append(labels, label) | |
295 | labelRanges = append(labelRanges, labelRange) | |
107c1cdb ND |
296 | // parseQuoteStringLiteral recovers up to the closing quote |
297 | // if it encounters problems, so we can continue looking for | |
298 | // more labels and eventually the block body even. | |
15c0b25d AP |
299 | |
300 | case TokenIdent: | |
301 | tok = p.Read() // eat token | |
302 | label, labelRange := string(tok.Bytes), tok.Range | |
303 | labels = append(labels, label) | |
304 | labelRanges = append(labelRanges, labelRange) | |
305 | ||
306 | default: | |
307 | switch tok.Type { | |
308 | case TokenEqual: | |
309 | diags = append(diags, &hcl.Diagnostic{ | |
310 | Severity: hcl.DiagError, | |
311 | Summary: "Invalid block definition", | |
107c1cdb | 312 | Detail: "The equals sign \"=\" indicates an argument definition, and must not be used when defining a block.", |
15c0b25d AP |
313 | Subject: &tok.Range, |
314 | Context: hcl.RangeBetween(ident.Range, tok.Range).Ptr(), | |
315 | }) | |
316 | case TokenNewline: | |
317 | diags = append(diags, &hcl.Diagnostic{ | |
318 | Severity: hcl.DiagError, | |
319 | Summary: "Invalid block definition", | |
320 | Detail: "A block definition must have block content delimited by \"{\" and \"}\", starting on the same line as the block header.", | |
321 | Subject: &tok.Range, | |
322 | Context: hcl.RangeBetween(ident.Range, tok.Range).Ptr(), | |
323 | }) | |
324 | default: | |
325 | if !p.recovery { | |
326 | diags = append(diags, &hcl.Diagnostic{ | |
327 | Severity: hcl.DiagError, | |
328 | Summary: "Invalid block definition", | |
329 | Detail: "Either a quoted string block label or an opening brace (\"{\") is expected here.", | |
330 | Subject: &tok.Range, | |
331 | Context: hcl.RangeBetween(ident.Range, tok.Range).Ptr(), | |
332 | }) | |
333 | } | |
334 | } | |
335 | ||
336 | p.recoverAfterBodyItem() | |
337 | ||
338 | return &Block{ | |
339 | Type: blockType, | |
340 | Labels: labels, | |
107c1cdb ND |
341 | Body: &Body{ |
342 | SrcRange: ident.Range, | |
343 | EndRange: ident.Range, | |
344 | }, | |
15c0b25d AP |
345 | |
346 | TypeRange: ident.Range, | |
347 | LabelRanges: labelRanges, | |
348 | OpenBraceRange: ident.Range, // placeholder | |
349 | CloseBraceRange: ident.Range, // placeholder | |
350 | }, diags | |
351 | } | |
352 | } | |
353 | ||
354 | // Once we fall out here, the peeker is pointed just after our opening | |
355 | // brace, so we can begin our nested body parsing. | |
107c1cdb ND |
356 | var body *Body |
357 | var bodyDiags hcl.Diagnostics | |
358 | switch p.Peek().Type { | |
359 | case TokenNewline, TokenEOF, TokenCBrace: | |
360 | body, bodyDiags = p.ParseBody(TokenCBrace) | |
361 | default: | |
362 | // Special one-line, single-attribute block parsing mode. | |
363 | body, bodyDiags = p.parseSingleAttrBody(TokenCBrace) | |
364 | switch p.Peek().Type { | |
365 | case TokenCBrace: | |
366 | p.Read() // the happy path - just consume the closing brace | |
367 | case TokenComma: | |
368 | // User seems to be trying to use the object-constructor | |
369 | // comma-separated style, which isn't permitted for blocks. | |
370 | diags = append(diags, &hcl.Diagnostic{ | |
371 | Severity: hcl.DiagError, | |
372 | Summary: "Invalid single-argument block definition", | |
373 | Detail: "Single-line block syntax can include only one argument definition. To define multiple arguments, use the multi-line block syntax with one argument definition per line.", | |
374 | Subject: p.Peek().Range.Ptr(), | |
375 | }) | |
376 | p.recover(TokenCBrace) | |
377 | case TokenNewline: | |
378 | // We don't allow weird mixtures of single and multi-line syntax. | |
379 | diags = append(diags, &hcl.Diagnostic{ | |
380 | Severity: hcl.DiagError, | |
381 | Summary: "Invalid single-argument block definition", | |
382 | Detail: "An argument definition on the same line as its containing block creates a single-line block definition, which must also be closed on the same line. Place the block's closing brace immediately after the argument definition.", | |
383 | Subject: p.Peek().Range.Ptr(), | |
384 | }) | |
385 | p.recover(TokenCBrace) | |
386 | default: | |
387 | // Some other weird thing is going on. Since we can't guess a likely | |
388 | // user intent for this one, we'll skip it if we're already in | |
389 | // recovery mode. | |
390 | if !p.recovery { | |
391 | diags = append(diags, &hcl.Diagnostic{ | |
392 | Severity: hcl.DiagError, | |
393 | Summary: "Invalid single-argument block definition", | |
394 | Detail: "A single-line block definition must end with a closing brace immediately after its single argument definition.", | |
395 | Subject: p.Peek().Range.Ptr(), | |
396 | }) | |
397 | } | |
398 | p.recover(TokenCBrace) | |
399 | } | |
400 | } | |
15c0b25d AP |
401 | diags = append(diags, bodyDiags...) |
402 | cBraceRange := p.PrevRange() | |
403 | ||
404 | eol := p.Peek() | |
405 | if eol.Type == TokenNewline || eol.Type == TokenEOF { | |
406 | p.Read() // eat newline | |
407 | } else { | |
408 | if !p.recovery { | |
409 | diags = append(diags, &hcl.Diagnostic{ | |
410 | Severity: hcl.DiagError, | |
411 | Summary: "Missing newline after block definition", | |
412 | Detail: "A block definition must end with a newline.", | |
413 | Subject: &eol.Range, | |
414 | Context: hcl.RangeBetween(ident.Range, eol.Range).Ptr(), | |
415 | }) | |
416 | } | |
417 | p.recoverAfterBodyItem() | |
418 | } | |
419 | ||
107c1cdb ND |
420 | // We must never produce a nil body, since the caller may attempt to |
421 | // do analysis of a partial result when there's an error, so we'll | |
422 | // insert a placeholder if we otherwise failed to produce a valid | |
423 | // body due to one of the syntax error paths above. | |
424 | if body == nil && diags.HasErrors() { | |
425 | body = &Body{ | |
426 | SrcRange: hcl.RangeBetween(oBrace.Range, cBraceRange), | |
427 | EndRange: cBraceRange, | |
428 | } | |
429 | } | |
430 | ||
15c0b25d AP |
431 | return &Block{ |
432 | Type: blockType, | |
433 | Labels: labels, | |
434 | Body: body, | |
435 | ||
436 | TypeRange: ident.Range, | |
437 | LabelRanges: labelRanges, | |
438 | OpenBraceRange: oBrace.Range, | |
439 | CloseBraceRange: cBraceRange, | |
440 | }, diags | |
441 | } | |
442 | ||
443 | func (p *parser) ParseExpression() (Expression, hcl.Diagnostics) { | |
444 | return p.parseTernaryConditional() | |
445 | } | |
446 | ||
447 | func (p *parser) parseTernaryConditional() (Expression, hcl.Diagnostics) { | |
448 | // The ternary conditional operator (.. ? .. : ..) behaves somewhat | |
449 | // like a binary operator except that the "symbol" is itself | |
450 | // an expression enclosed in two punctuation characters. | |
451 | // The middle expression is parsed as if the ? and : symbols | |
452 | // were parentheses. The "rhs" (the "false expression") is then | |
453 | // treated right-associatively so it behaves similarly to the | |
454 | // middle in terms of precedence. | |
455 | ||
456 | startRange := p.NextRange() | |
457 | var condExpr, trueExpr, falseExpr Expression | |
458 | var diags hcl.Diagnostics | |
459 | ||
460 | condExpr, condDiags := p.parseBinaryOps(binaryOps) | |
461 | diags = append(diags, condDiags...) | |
462 | if p.recovery && condDiags.HasErrors() { | |
463 | return condExpr, diags | |
464 | } | |
465 | ||
466 | questionMark := p.Peek() | |
467 | if questionMark.Type != TokenQuestion { | |
468 | return condExpr, diags | |
469 | } | |
470 | ||
471 | p.Read() // eat question mark | |
472 | ||
473 | trueExpr, trueDiags := p.ParseExpression() | |
474 | diags = append(diags, trueDiags...) | |
475 | if p.recovery && trueDiags.HasErrors() { | |
476 | return condExpr, diags | |
477 | } | |
478 | ||
479 | colon := p.Peek() | |
480 | if colon.Type != TokenColon { | |
481 | diags = append(diags, &hcl.Diagnostic{ | |
482 | Severity: hcl.DiagError, | |
483 | Summary: "Missing false expression in conditional", | |
484 | Detail: "The conditional operator (...?...:...) requires a false expression, delimited by a colon.", | |
485 | Subject: &colon.Range, | |
486 | Context: hcl.RangeBetween(startRange, colon.Range).Ptr(), | |
487 | }) | |
488 | return condExpr, diags | |
489 | } | |
490 | ||
491 | p.Read() // eat colon | |
492 | ||
493 | falseExpr, falseDiags := p.ParseExpression() | |
494 | diags = append(diags, falseDiags...) | |
495 | if p.recovery && falseDiags.HasErrors() { | |
496 | return condExpr, diags | |
497 | } | |
498 | ||
499 | return &ConditionalExpr{ | |
500 | Condition: condExpr, | |
501 | TrueResult: trueExpr, | |
502 | FalseResult: falseExpr, | |
503 | ||
504 | SrcRange: hcl.RangeBetween(startRange, falseExpr.Range()), | |
505 | }, diags | |
506 | } | |
507 | ||
508 | // parseBinaryOps calls itself recursively to work through all of the | |
509 | // operator precedence groups, and then eventually calls parseExpressionTerm | |
510 | // for each operand. | |
511 | func (p *parser) parseBinaryOps(ops []map[TokenType]*Operation) (Expression, hcl.Diagnostics) { | |
512 | if len(ops) == 0 { | |
513 | // We've run out of operators, so now we'll just try to parse a term. | |
514 | return p.parseExpressionWithTraversals() | |
515 | } | |
516 | ||
517 | thisLevel := ops[0] | |
518 | remaining := ops[1:] | |
519 | ||
520 | var lhs, rhs Expression | |
521 | var operation *Operation | |
522 | var diags hcl.Diagnostics | |
523 | ||
524 | // Parse a term that might be the first operand of a binary | |
525 | // operation or it might just be a standalone term. | |
526 | // We won't know until we've parsed it and can look ahead | |
527 | // to see if there's an operator token for this level. | |
528 | lhs, lhsDiags := p.parseBinaryOps(remaining) | |
529 | diags = append(diags, lhsDiags...) | |
530 | if p.recovery && lhsDiags.HasErrors() { | |
531 | return lhs, diags | |
532 | } | |
533 | ||
534 | // We'll keep eating up operators until we run out, so that operators | |
535 | // with the same precedence will combine in a left-associative manner: | |
536 | // a+b+c => (a+b)+c, not a+(b+c) | |
537 | // | |
538 | // Should we later want to have right-associative operators, a way | |
539 | // to achieve that would be to call back up to ParseExpression here | |
540 | // instead of iteratively parsing only the remaining operators. | |
541 | for { | |
542 | next := p.Peek() | |
543 | var newOp *Operation | |
544 | var ok bool | |
545 | if newOp, ok = thisLevel[next.Type]; !ok { | |
546 | break | |
547 | } | |
548 | ||
549 | // Are we extending an expression started on the previous iteration? | |
550 | if operation != nil { | |
551 | lhs = &BinaryOpExpr{ | |
552 | LHS: lhs, | |
553 | Op: operation, | |
554 | RHS: rhs, | |
555 | ||
556 | SrcRange: hcl.RangeBetween(lhs.Range(), rhs.Range()), | |
557 | } | |
558 | } | |
559 | ||
560 | operation = newOp | |
561 | p.Read() // eat operator token | |
562 | var rhsDiags hcl.Diagnostics | |
563 | rhs, rhsDiags = p.parseBinaryOps(remaining) | |
564 | diags = append(diags, rhsDiags...) | |
565 | if p.recovery && rhsDiags.HasErrors() { | |
566 | return lhs, diags | |
567 | } | |
568 | } | |
569 | ||
570 | if operation == nil { | |
571 | return lhs, diags | |
572 | } | |
573 | ||
574 | return &BinaryOpExpr{ | |
575 | LHS: lhs, | |
576 | Op: operation, | |
577 | RHS: rhs, | |
578 | ||
579 | SrcRange: hcl.RangeBetween(lhs.Range(), rhs.Range()), | |
580 | }, diags | |
581 | } | |
582 | ||
583 | func (p *parser) parseExpressionWithTraversals() (Expression, hcl.Diagnostics) { | |
584 | term, diags := p.parseExpressionTerm() | |
107c1cdb ND |
585 | ret, moreDiags := p.parseExpressionTraversals(term) |
586 | diags = append(diags, moreDiags...) | |
587 | return ret, diags | |
588 | } | |
589 | ||
590 | func (p *parser) parseExpressionTraversals(from Expression) (Expression, hcl.Diagnostics) { | |
591 | var diags hcl.Diagnostics | |
592 | ret := from | |
15c0b25d AP |
593 | |
594 | Traversal: | |
595 | for { | |
596 | next := p.Peek() | |
597 | ||
598 | switch next.Type { | |
599 | case TokenDot: | |
600 | // Attribute access or splat | |
601 | dot := p.Read() | |
602 | attrTok := p.Peek() | |
603 | ||
604 | switch attrTok.Type { | |
605 | case TokenIdent: | |
606 | attrTok = p.Read() // eat token | |
607 | name := string(attrTok.Bytes) | |
608 | rng := hcl.RangeBetween(dot.Range, attrTok.Range) | |
609 | step := hcl.TraverseAttr{ | |
610 | Name: name, | |
611 | SrcRange: rng, | |
612 | } | |
613 | ||
614 | ret = makeRelativeTraversal(ret, step, rng) | |
615 | ||
616 | case TokenNumberLit: | |
617 | // This is a weird form we inherited from HIL, allowing numbers | |
618 | // to be used as attributes as a weird way of writing [n]. | |
619 | // This was never actually a first-class thing in HIL, but | |
620 | // HIL tolerated sequences like .0. in its variable names and | |
621 | // calling applications like Terraform exploited that to | |
622 | // introduce indexing syntax where none existed. | |
623 | numTok := p.Read() // eat token | |
624 | attrTok = numTok | |
625 | ||
626 | // This syntax is ambiguous if multiple indices are used in | |
627 | // succession, like foo.0.1.baz: that actually parses as | |
628 | // a fractional number 0.1. Since we're only supporting this | |
629 | // syntax for compatibility with legacy Terraform | |
630 | // configurations, and Terraform does not tend to have lists | |
631 | // of lists, we'll choose to reject that here with a helpful | |
632 | // error message, rather than failing later because the index | |
633 | // isn't a whole number. | |
634 | if dotIdx := bytes.IndexByte(numTok.Bytes, '.'); dotIdx >= 0 { | |
635 | first := numTok.Bytes[:dotIdx] | |
636 | second := numTok.Bytes[dotIdx+1:] | |
637 | diags = append(diags, &hcl.Diagnostic{ | |
638 | Severity: hcl.DiagError, | |
639 | Summary: "Invalid legacy index syntax", | |
640 | Detail: fmt.Sprintf("When using the legacy index syntax, chaining two indexes together is not permitted. Use the proper index syntax instead, like [%s][%s].", first, second), | |
641 | Subject: &attrTok.Range, | |
642 | }) | |
643 | rng := hcl.RangeBetween(dot.Range, numTok.Range) | |
644 | step := hcl.TraverseIndex{ | |
645 | Key: cty.DynamicVal, | |
646 | SrcRange: rng, | |
647 | } | |
648 | ret = makeRelativeTraversal(ret, step, rng) | |
649 | break | |
650 | } | |
651 | ||
652 | numVal, numDiags := p.numberLitValue(numTok) | |
653 | diags = append(diags, numDiags...) | |
654 | ||
655 | rng := hcl.RangeBetween(dot.Range, numTok.Range) | |
656 | step := hcl.TraverseIndex{ | |
657 | Key: numVal, | |
658 | SrcRange: rng, | |
659 | } | |
660 | ||
661 | ret = makeRelativeTraversal(ret, step, rng) | |
662 | ||
663 | case TokenStar: | |
664 | // "Attribute-only" splat expression. | |
665 | // (This is a kinda weird construct inherited from HIL, which | |
666 | // behaves a bit like a [*] splat except that it is only able | |
667 | // to do attribute traversals into each of its elements, | |
668 | // whereas foo[*] can support _any_ traversal. | |
669 | marker := p.Read() // eat star | |
670 | trav := make(hcl.Traversal, 0, 1) | |
671 | var firstRange, lastRange hcl.Range | |
672 | firstRange = p.NextRange() | |
673 | for p.Peek().Type == TokenDot { | |
674 | dot := p.Read() | |
675 | ||
676 | if p.Peek().Type == TokenNumberLit { | |
677 | // Continuing the "weird stuff inherited from HIL" | |
678 | // theme, we also allow numbers as attribute names | |
679 | // inside splats and interpret them as indexing | |
680 | // into a list, for expressions like: | |
681 | // foo.bar.*.baz.0.foo | |
682 | numTok := p.Read() | |
683 | ||
684 | // Weird special case if the user writes something | |
685 | // like foo.bar.*.baz.0.0.foo, where 0.0 parses | |
686 | // as a number. | |
687 | if dotIdx := bytes.IndexByte(numTok.Bytes, '.'); dotIdx >= 0 { | |
688 | first := numTok.Bytes[:dotIdx] | |
689 | second := numTok.Bytes[dotIdx+1:] | |
690 | diags = append(diags, &hcl.Diagnostic{ | |
691 | Severity: hcl.DiagError, | |
692 | Summary: "Invalid legacy index syntax", | |
693 | Detail: fmt.Sprintf("When using the legacy index syntax, chaining two indexes together is not permitted. Use the proper index syntax with a full splat expression [*] instead, like [%s][%s].", first, second), | |
694 | Subject: &attrTok.Range, | |
695 | }) | |
696 | trav = append(trav, hcl.TraverseIndex{ | |
697 | Key: cty.DynamicVal, | |
698 | SrcRange: hcl.RangeBetween(dot.Range, numTok.Range), | |
699 | }) | |
700 | lastRange = numTok.Range | |
701 | continue | |
702 | } | |
703 | ||
704 | numVal, numDiags := p.numberLitValue(numTok) | |
705 | diags = append(diags, numDiags...) | |
706 | trav = append(trav, hcl.TraverseIndex{ | |
707 | Key: numVal, | |
708 | SrcRange: hcl.RangeBetween(dot.Range, numTok.Range), | |
709 | }) | |
710 | lastRange = numTok.Range | |
711 | continue | |
712 | } | |
713 | ||
714 | if p.Peek().Type != TokenIdent { | |
715 | if !p.recovery { | |
716 | if p.Peek().Type == TokenStar { | |
717 | diags = append(diags, &hcl.Diagnostic{ | |
718 | Severity: hcl.DiagError, | |
719 | Summary: "Nested splat expression not allowed", | |
720 | Detail: "A splat expression (*) cannot be used inside another attribute-only splat expression.", | |
721 | Subject: p.Peek().Range.Ptr(), | |
722 | }) | |
723 | } else { | |
724 | diags = append(diags, &hcl.Diagnostic{ | |
725 | Severity: hcl.DiagError, | |
726 | Summary: "Invalid attribute name", | |
727 | Detail: "An attribute name is required after a dot.", | |
728 | Subject: &attrTok.Range, | |
729 | }) | |
730 | } | |
731 | } | |
732 | p.setRecovery() | |
733 | continue Traversal | |
734 | } | |
735 | ||
736 | attrTok := p.Read() | |
737 | trav = append(trav, hcl.TraverseAttr{ | |
738 | Name: string(attrTok.Bytes), | |
739 | SrcRange: hcl.RangeBetween(dot.Range, attrTok.Range), | |
740 | }) | |
741 | lastRange = attrTok.Range | |
742 | } | |
743 | ||
744 | itemExpr := &AnonSymbolExpr{ | |
745 | SrcRange: hcl.RangeBetween(dot.Range, marker.Range), | |
746 | } | |
747 | var travExpr Expression | |
748 | if len(trav) == 0 { | |
749 | travExpr = itemExpr | |
750 | } else { | |
751 | travExpr = &RelativeTraversalExpr{ | |
752 | Source: itemExpr, | |
753 | Traversal: trav, | |
754 | SrcRange: hcl.RangeBetween(firstRange, lastRange), | |
755 | } | |
756 | } | |
757 | ||
758 | ret = &SplatExpr{ | |
759 | Source: ret, | |
760 | Each: travExpr, | |
761 | Item: itemExpr, | |
762 | ||
763 | SrcRange: hcl.RangeBetween(dot.Range, lastRange), | |
764 | MarkerRange: hcl.RangeBetween(dot.Range, marker.Range), | |
765 | } | |
766 | ||
767 | default: | |
768 | diags = append(diags, &hcl.Diagnostic{ | |
769 | Severity: hcl.DiagError, | |
770 | Summary: "Invalid attribute name", | |
771 | Detail: "An attribute name is required after a dot.", | |
772 | Subject: &attrTok.Range, | |
773 | }) | |
774 | // This leaves the peeker in a bad place, so following items | |
775 | // will probably be misparsed until we hit something that | |
776 | // allows us to re-sync. | |
777 | // | |
778 | // We will probably need to do something better here eventually | |
779 | // in order to support autocomplete triggered by typing a | |
780 | // period. | |
781 | p.setRecovery() | |
782 | } | |
783 | ||
784 | case TokenOBrack: | |
785 | // Indexing of a collection. | |
786 | // This may or may not be a hcl.Traverser, depending on whether | |
787 | // the key value is something constant. | |
788 | ||
789 | open := p.Read() | |
107c1cdb ND |
790 | switch p.Peek().Type { |
791 | case TokenStar: | |
792 | // This is a full splat expression, like foo[*], which consumes | |
793 | // the rest of the traversal steps after it using a recursive | |
794 | // call to this function. | |
795 | p.Read() // consume star | |
796 | close := p.Read() | |
15c0b25d AP |
797 | if close.Type != TokenCBrack && !p.recovery { |
798 | diags = append(diags, &hcl.Diagnostic{ | |
799 | Severity: hcl.DiagError, | |
107c1cdb ND |
800 | Summary: "Missing close bracket on splat index", |
801 | Detail: "The star for a full splat operator must be immediately followed by a closing bracket (\"]\").", | |
15c0b25d AP |
802 | Subject: &close.Range, |
803 | }) | |
804 | close = p.recover(TokenCBrack) | |
805 | } | |
107c1cdb ND |
806 | // Splat expressions use a special "anonymous symbol" as a |
807 | // placeholder in an expression to be evaluated once for each | |
808 | // item in the source expression. | |
809 | itemExpr := &AnonSymbolExpr{ | |
810 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
811 | } | |
812 | // Now we'll recursively call this same function to eat any | |
813 | // remaining traversal steps against the anonymous symbol. | |
814 | travExpr, nestedDiags := p.parseExpressionTraversals(itemExpr) | |
815 | diags = append(diags, nestedDiags...) | |
15c0b25d | 816 | |
107c1cdb ND |
817 | ret = &SplatExpr{ |
818 | Source: ret, | |
819 | Each: travExpr, | |
820 | Item: itemExpr, | |
821 | ||
822 | SrcRange: hcl.RangeBetween(open.Range, travExpr.Range()), | |
823 | MarkerRange: hcl.RangeBetween(open.Range, close.Range), | |
15c0b25d | 824 | } |
15c0b25d | 825 | |
107c1cdb ND |
826 | default: |
827 | ||
828 | var close Token | |
829 | p.PushIncludeNewlines(false) // arbitrary newlines allowed in brackets | |
830 | keyExpr, keyDiags := p.ParseExpression() | |
831 | diags = append(diags, keyDiags...) | |
832 | if p.recovery && keyDiags.HasErrors() { | |
833 | close = p.recover(TokenCBrack) | |
834 | } else { | |
835 | close = p.Read() | |
836 | if close.Type != TokenCBrack && !p.recovery { | |
837 | diags = append(diags, &hcl.Diagnostic{ | |
838 | Severity: hcl.DiagError, | |
839 | Summary: "Missing close bracket on index", | |
840 | Detail: "The index operator must end with a closing bracket (\"]\").", | |
841 | Subject: &close.Range, | |
842 | }) | |
843 | close = p.recover(TokenCBrack) | |
844 | } | |
845 | } | |
846 | p.PopIncludeNewlines() | |
847 | ||
848 | if lit, isLit := keyExpr.(*LiteralValueExpr); isLit { | |
849 | litKey, _ := lit.Value(nil) | |
850 | rng := hcl.RangeBetween(open.Range, close.Range) | |
851 | step := hcl.TraverseIndex{ | |
852 | Key: litKey, | |
853 | SrcRange: rng, | |
854 | } | |
855 | ret = makeRelativeTraversal(ret, step, rng) | |
856 | } else { | |
857 | rng := hcl.RangeBetween(open.Range, close.Range) | |
858 | ret = &IndexExpr{ | |
859 | Collection: ret, | |
860 | Key: keyExpr, | |
861 | ||
862 | SrcRange: rng, | |
863 | OpenRange: open.Range, | |
864 | } | |
15c0b25d AP |
865 | } |
866 | } | |
867 | ||
868 | default: | |
869 | break Traversal | |
870 | } | |
871 | } | |
872 | ||
873 | return ret, diags | |
874 | } | |
875 | ||
876 | // makeRelativeTraversal takes an expression and a traverser and returns | |
877 | // a traversal expression that combines the two. If the given expression | |
878 | // is already a traversal, it is extended in place (mutating it) and | |
879 | // returned. If it isn't, a new RelativeTraversalExpr is created and returned. | |
880 | func makeRelativeTraversal(expr Expression, next hcl.Traverser, rng hcl.Range) Expression { | |
881 | switch texpr := expr.(type) { | |
882 | case *ScopeTraversalExpr: | |
883 | texpr.Traversal = append(texpr.Traversal, next) | |
884 | texpr.SrcRange = hcl.RangeBetween(texpr.SrcRange, rng) | |
885 | return texpr | |
886 | case *RelativeTraversalExpr: | |
887 | texpr.Traversal = append(texpr.Traversal, next) | |
888 | texpr.SrcRange = hcl.RangeBetween(texpr.SrcRange, rng) | |
889 | return texpr | |
890 | default: | |
891 | return &RelativeTraversalExpr{ | |
892 | Source: expr, | |
893 | Traversal: hcl.Traversal{next}, | |
894 | SrcRange: rng, | |
895 | } | |
896 | } | |
897 | } | |
898 | ||
899 | func (p *parser) parseExpressionTerm() (Expression, hcl.Diagnostics) { | |
900 | start := p.Peek() | |
901 | ||
902 | switch start.Type { | |
903 | case TokenOParen: | |
904 | p.Read() // eat open paren | |
905 | ||
906 | p.PushIncludeNewlines(false) | |
907 | ||
908 | expr, diags := p.ParseExpression() | |
909 | if diags.HasErrors() { | |
910 | // attempt to place the peeker after our closing paren | |
911 | // before we return, so that the next parser has some | |
912 | // chance of finding a valid expression. | |
913 | p.recover(TokenCParen) | |
914 | p.PopIncludeNewlines() | |
915 | return expr, diags | |
916 | } | |
917 | ||
918 | close := p.Peek() | |
919 | if close.Type != TokenCParen { | |
920 | diags = append(diags, &hcl.Diagnostic{ | |
921 | Severity: hcl.DiagError, | |
922 | Summary: "Unbalanced parentheses", | |
923 | Detail: "Expected a closing parenthesis to terminate the expression.", | |
924 | Subject: &close.Range, | |
925 | Context: hcl.RangeBetween(start.Range, close.Range).Ptr(), | |
926 | }) | |
927 | p.setRecovery() | |
928 | } | |
929 | ||
930 | p.Read() // eat closing paren | |
931 | p.PopIncludeNewlines() | |
932 | ||
933 | return expr, diags | |
934 | ||
935 | case TokenNumberLit: | |
936 | tok := p.Read() // eat number token | |
937 | ||
938 | numVal, diags := p.numberLitValue(tok) | |
939 | return &LiteralValueExpr{ | |
940 | Val: numVal, | |
941 | SrcRange: tok.Range, | |
942 | }, diags | |
943 | ||
944 | case TokenIdent: | |
945 | tok := p.Read() // eat identifier token | |
946 | ||
947 | if p.Peek().Type == TokenOParen { | |
948 | return p.finishParsingFunctionCall(tok) | |
949 | } | |
950 | ||
951 | name := string(tok.Bytes) | |
952 | switch name { | |
953 | case "true": | |
954 | return &LiteralValueExpr{ | |
955 | Val: cty.True, | |
956 | SrcRange: tok.Range, | |
957 | }, nil | |
958 | case "false": | |
959 | return &LiteralValueExpr{ | |
960 | Val: cty.False, | |
961 | SrcRange: tok.Range, | |
962 | }, nil | |
963 | case "null": | |
964 | return &LiteralValueExpr{ | |
965 | Val: cty.NullVal(cty.DynamicPseudoType), | |
966 | SrcRange: tok.Range, | |
967 | }, nil | |
968 | default: | |
969 | return &ScopeTraversalExpr{ | |
970 | Traversal: hcl.Traversal{ | |
971 | hcl.TraverseRoot{ | |
972 | Name: name, | |
973 | SrcRange: tok.Range, | |
974 | }, | |
975 | }, | |
976 | SrcRange: tok.Range, | |
977 | }, nil | |
978 | } | |
979 | ||
980 | case TokenOQuote, TokenOHeredoc: | |
981 | open := p.Read() // eat opening marker | |
982 | closer := p.oppositeBracket(open.Type) | |
107c1cdb | 983 | exprs, passthru, _, diags := p.parseTemplateInner(closer, tokenOpensFlushHeredoc(open)) |
15c0b25d AP |
984 | |
985 | closeRange := p.PrevRange() | |
986 | ||
987 | if passthru { | |
988 | if len(exprs) != 1 { | |
989 | panic("passthru set with len(exprs) != 1") | |
990 | } | |
991 | return &TemplateWrapExpr{ | |
992 | Wrapped: exprs[0], | |
993 | SrcRange: hcl.RangeBetween(open.Range, closeRange), | |
994 | }, diags | |
995 | } | |
996 | ||
997 | return &TemplateExpr{ | |
998 | Parts: exprs, | |
999 | SrcRange: hcl.RangeBetween(open.Range, closeRange), | |
1000 | }, diags | |
1001 | ||
1002 | case TokenMinus: | |
1003 | tok := p.Read() // eat minus token | |
1004 | ||
1005 | // Important to use parseExpressionWithTraversals rather than parseExpression | |
1006 | // here, otherwise we can capture a following binary expression into | |
1007 | // our negation. | |
1008 | // e.g. -46+5 should parse as (-46)+5, not -(46+5) | |
1009 | operand, diags := p.parseExpressionWithTraversals() | |
1010 | return &UnaryOpExpr{ | |
1011 | Op: OpNegate, | |
1012 | Val: operand, | |
1013 | ||
1014 | SrcRange: hcl.RangeBetween(tok.Range, operand.Range()), | |
1015 | SymbolRange: tok.Range, | |
1016 | }, diags | |
1017 | ||
1018 | case TokenBang: | |
1019 | tok := p.Read() // eat bang token | |
1020 | ||
1021 | // Important to use parseExpressionWithTraversals rather than parseExpression | |
1022 | // here, otherwise we can capture a following binary expression into | |
1023 | // our negation. | |
1024 | operand, diags := p.parseExpressionWithTraversals() | |
1025 | return &UnaryOpExpr{ | |
1026 | Op: OpLogicalNot, | |
1027 | Val: operand, | |
1028 | ||
1029 | SrcRange: hcl.RangeBetween(tok.Range, operand.Range()), | |
1030 | SymbolRange: tok.Range, | |
1031 | }, diags | |
1032 | ||
1033 | case TokenOBrack: | |
1034 | return p.parseTupleCons() | |
1035 | ||
1036 | case TokenOBrace: | |
1037 | return p.parseObjectCons() | |
1038 | ||
1039 | default: | |
1040 | var diags hcl.Diagnostics | |
1041 | if !p.recovery { | |
1042 | diags = append(diags, &hcl.Diagnostic{ | |
1043 | Severity: hcl.DiagError, | |
1044 | Summary: "Invalid expression", | |
1045 | Detail: "Expected the start of an expression, but found an invalid expression token.", | |
1046 | Subject: &start.Range, | |
1047 | }) | |
1048 | } | |
1049 | p.setRecovery() | |
1050 | ||
1051 | // Return a placeholder so that the AST is still structurally sound | |
1052 | // even in the presence of parse errors. | |
1053 | return &LiteralValueExpr{ | |
1054 | Val: cty.DynamicVal, | |
1055 | SrcRange: start.Range, | |
1056 | }, diags | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | func (p *parser) numberLitValue(tok Token) (cty.Value, hcl.Diagnostics) { | |
107c1cdb ND |
1061 | // The cty.ParseNumberVal is always the same behavior as converting a |
1062 | // string to a number, ensuring we always interpret decimal numbers in | |
1063 | // the same way. | |
1064 | numVal, err := cty.ParseNumberVal(string(tok.Bytes)) | |
15c0b25d AP |
1065 | if err != nil { |
1066 | ret := cty.UnknownVal(cty.Number) | |
1067 | return ret, hcl.Diagnostics{ | |
1068 | { | |
1069 | Severity: hcl.DiagError, | |
1070 | Summary: "Invalid number literal", | |
1071 | // FIXME: not a very good error message, but convert only | |
1072 | // gives us "a number is required", so not much help either. | |
1073 | Detail: "Failed to recognize the value of this number literal.", | |
1074 | Subject: &tok.Range, | |
1075 | }, | |
1076 | } | |
1077 | } | |
1078 | return numVal, nil | |
1079 | } | |
1080 | ||
1081 | // finishParsingFunctionCall parses a function call assuming that the function | |
1082 | // name was already read, and so the peeker should be pointing at the opening | |
1083 | // parenthesis after the name. | |
1084 | func (p *parser) finishParsingFunctionCall(name Token) (Expression, hcl.Diagnostics) { | |
1085 | openTok := p.Read() | |
1086 | if openTok.Type != TokenOParen { | |
1087 | // should never happen if callers behave | |
1088 | panic("finishParsingFunctionCall called with non-parenthesis as next token") | |
1089 | } | |
1090 | ||
1091 | var args []Expression | |
1092 | var diags hcl.Diagnostics | |
1093 | var expandFinal bool | |
1094 | var closeTok Token | |
1095 | ||
1096 | // Arbitrary newlines are allowed inside the function call parentheses. | |
1097 | p.PushIncludeNewlines(false) | |
1098 | ||
1099 | Token: | |
1100 | for { | |
1101 | tok := p.Peek() | |
1102 | ||
1103 | if tok.Type == TokenCParen { | |
1104 | closeTok = p.Read() // eat closing paren | |
1105 | break Token | |
1106 | } | |
1107 | ||
1108 | arg, argDiags := p.ParseExpression() | |
1109 | args = append(args, arg) | |
1110 | diags = append(diags, argDiags...) | |
1111 | if p.recovery && argDiags.HasErrors() { | |
1112 | // if there was a parse error in the argument then we've | |
1113 | // probably been left in a weird place in the token stream, | |
1114 | // so we'll bail out with a partial argument list. | |
1115 | p.recover(TokenCParen) | |
1116 | break Token | |
1117 | } | |
1118 | ||
1119 | sep := p.Read() | |
1120 | if sep.Type == TokenCParen { | |
1121 | closeTok = sep | |
1122 | break Token | |
1123 | } | |
1124 | ||
1125 | if sep.Type == TokenEllipsis { | |
1126 | expandFinal = true | |
1127 | ||
1128 | if p.Peek().Type != TokenCParen { | |
1129 | if !p.recovery { | |
1130 | diags = append(diags, &hcl.Diagnostic{ | |
1131 | Severity: hcl.DiagError, | |
1132 | Summary: "Missing closing parenthesis", | |
1133 | Detail: "An expanded function argument (with ...) must be immediately followed by closing parentheses.", | |
1134 | Subject: &sep.Range, | |
1135 | Context: hcl.RangeBetween(name.Range, sep.Range).Ptr(), | |
1136 | }) | |
1137 | } | |
1138 | closeTok = p.recover(TokenCParen) | |
1139 | } else { | |
1140 | closeTok = p.Read() // eat closing paren | |
1141 | } | |
1142 | break Token | |
1143 | } | |
1144 | ||
1145 | if sep.Type != TokenComma { | |
1146 | diags = append(diags, &hcl.Diagnostic{ | |
1147 | Severity: hcl.DiagError, | |
1148 | Summary: "Missing argument separator", | |
1149 | Detail: "A comma is required to separate each function argument from the next.", | |
1150 | Subject: &sep.Range, | |
1151 | Context: hcl.RangeBetween(name.Range, sep.Range).Ptr(), | |
1152 | }) | |
1153 | closeTok = p.recover(TokenCParen) | |
1154 | break Token | |
1155 | } | |
1156 | ||
1157 | if p.Peek().Type == TokenCParen { | |
1158 | // A trailing comma after the last argument gets us in here. | |
1159 | closeTok = p.Read() // eat closing paren | |
1160 | break Token | |
1161 | } | |
1162 | ||
1163 | } | |
1164 | ||
1165 | p.PopIncludeNewlines() | |
1166 | ||
1167 | return &FunctionCallExpr{ | |
1168 | Name: string(name.Bytes), | |
1169 | Args: args, | |
1170 | ||
1171 | ExpandFinal: expandFinal, | |
1172 | ||
1173 | NameRange: name.Range, | |
1174 | OpenParenRange: openTok.Range, | |
1175 | CloseParenRange: closeTok.Range, | |
1176 | }, diags | |
1177 | } | |
1178 | ||
1179 | func (p *parser) parseTupleCons() (Expression, hcl.Diagnostics) { | |
1180 | open := p.Read() | |
1181 | if open.Type != TokenOBrack { | |
1182 | // Should never happen if callers are behaving | |
1183 | panic("parseTupleCons called without peeker pointing to open bracket") | |
1184 | } | |
1185 | ||
1186 | p.PushIncludeNewlines(false) | |
1187 | defer p.PopIncludeNewlines() | |
1188 | ||
1189 | if forKeyword.TokenMatches(p.Peek()) { | |
1190 | return p.finishParsingForExpr(open) | |
1191 | } | |
1192 | ||
1193 | var close Token | |
1194 | ||
1195 | var diags hcl.Diagnostics | |
1196 | var exprs []Expression | |
1197 | ||
1198 | for { | |
1199 | next := p.Peek() | |
1200 | if next.Type == TokenCBrack { | |
1201 | close = p.Read() // eat closer | |
1202 | break | |
1203 | } | |
1204 | ||
1205 | expr, exprDiags := p.ParseExpression() | |
1206 | exprs = append(exprs, expr) | |
1207 | diags = append(diags, exprDiags...) | |
1208 | ||
1209 | if p.recovery && exprDiags.HasErrors() { | |
1210 | // If expression parsing failed then we are probably in a strange | |
1211 | // place in the token stream, so we'll bail out and try to reset | |
1212 | // to after our closing bracket to allow parsing to continue. | |
1213 | close = p.recover(TokenCBrack) | |
1214 | break | |
1215 | } | |
1216 | ||
1217 | next = p.Peek() | |
1218 | if next.Type == TokenCBrack { | |
1219 | close = p.Read() // eat closer | |
1220 | break | |
1221 | } | |
1222 | ||
1223 | if next.Type != TokenComma { | |
1224 | if !p.recovery { | |
1225 | diags = append(diags, &hcl.Diagnostic{ | |
1226 | Severity: hcl.DiagError, | |
1227 | Summary: "Missing item separator", | |
1228 | Detail: "Expected a comma to mark the beginning of the next item.", | |
1229 | Subject: &next.Range, | |
1230 | Context: hcl.RangeBetween(open.Range, next.Range).Ptr(), | |
1231 | }) | |
1232 | } | |
1233 | close = p.recover(TokenCBrack) | |
1234 | break | |
1235 | } | |
1236 | ||
1237 | p.Read() // eat comma | |
1238 | ||
1239 | } | |
1240 | ||
1241 | return &TupleConsExpr{ | |
1242 | Exprs: exprs, | |
1243 | ||
1244 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1245 | OpenRange: open.Range, | |
1246 | }, diags | |
1247 | } | |
1248 | ||
1249 | func (p *parser) parseObjectCons() (Expression, hcl.Diagnostics) { | |
1250 | open := p.Read() | |
1251 | if open.Type != TokenOBrace { | |
1252 | // Should never happen if callers are behaving | |
1253 | panic("parseObjectCons called without peeker pointing to open brace") | |
1254 | } | |
1255 | ||
107c1cdb ND |
1256 | // We must temporarily stop looking at newlines here while we check for |
1257 | // a "for" keyword, since for expressions are _not_ newline-sensitive, | |
1258 | // even though object constructors are. | |
1259 | p.PushIncludeNewlines(false) | |
1260 | isFor := forKeyword.TokenMatches(p.Peek()) | |
1261 | p.PopIncludeNewlines() | |
1262 | if isFor { | |
15c0b25d AP |
1263 | return p.finishParsingForExpr(open) |
1264 | } | |
1265 | ||
107c1cdb ND |
1266 | p.PushIncludeNewlines(true) |
1267 | defer p.PopIncludeNewlines() | |
1268 | ||
15c0b25d AP |
1269 | var close Token |
1270 | ||
1271 | var diags hcl.Diagnostics | |
1272 | var items []ObjectConsItem | |
1273 | ||
1274 | for { | |
1275 | next := p.Peek() | |
1276 | if next.Type == TokenNewline { | |
1277 | p.Read() // eat newline | |
1278 | continue | |
1279 | } | |
1280 | ||
1281 | if next.Type == TokenCBrace { | |
1282 | close = p.Read() // eat closer | |
1283 | break | |
1284 | } | |
1285 | ||
1286 | var key Expression | |
1287 | var keyDiags hcl.Diagnostics | |
1288 | key, keyDiags = p.ParseExpression() | |
1289 | diags = append(diags, keyDiags...) | |
1290 | ||
1291 | if p.recovery && keyDiags.HasErrors() { | |
1292 | // If expression parsing failed then we are probably in a strange | |
1293 | // place in the token stream, so we'll bail out and try to reset | |
1294 | // to after our closing brace to allow parsing to continue. | |
1295 | close = p.recover(TokenCBrace) | |
1296 | break | |
1297 | } | |
1298 | ||
1299 | // We wrap up the key expression in a special wrapper that deals | |
1300 | // with our special case that naked identifiers as object keys | |
1301 | // are interpreted as literal strings. | |
1302 | key = &ObjectConsKeyExpr{Wrapped: key} | |
1303 | ||
1304 | next = p.Peek() | |
1305 | if next.Type != TokenEqual && next.Type != TokenColon { | |
1306 | if !p.recovery { | |
107c1cdb ND |
1307 | switch next.Type { |
1308 | case TokenNewline, TokenComma: | |
15c0b25d AP |
1309 | diags = append(diags, &hcl.Diagnostic{ |
1310 | Severity: hcl.DiagError, | |
107c1cdb ND |
1311 | Summary: "Missing attribute value", |
1312 | Detail: "Expected an attribute value, introduced by an equals sign (\"=\").", | |
15c0b25d AP |
1313 | Subject: &next.Range, |
1314 | Context: hcl.RangeBetween(open.Range, next.Range).Ptr(), | |
1315 | }) | |
107c1cdb ND |
1316 | case TokenIdent: |
1317 | // Although this might just be a plain old missing equals | |
1318 | // sign before a reference, one way to get here is to try | |
1319 | // to write an attribute name containing a period followed | |
1320 | // by a digit, which was valid in HCL1, like this: | |
1321 | // foo1.2_bar = "baz" | |
1322 | // We can't know exactly what the user intended here, but | |
1323 | // we'll augment our message with an extra hint in this case | |
1324 | // in case it is helpful. | |
15c0b25d AP |
1325 | diags = append(diags, &hcl.Diagnostic{ |
1326 | Severity: hcl.DiagError, | |
1327 | Summary: "Missing key/value separator", | |
107c1cdb ND |
1328 | Detail: "Expected an equals sign (\"=\") to mark the beginning of the attribute value. If you intended to given an attribute name containing periods or spaces, write the name in quotes to create a string literal.", |
1329 | Subject: &next.Range, | |
1330 | Context: hcl.RangeBetween(open.Range, next.Range).Ptr(), | |
1331 | }) | |
1332 | default: | |
1333 | diags = append(diags, &hcl.Diagnostic{ | |
1334 | Severity: hcl.DiagError, | |
1335 | Summary: "Missing key/value separator", | |
1336 | Detail: "Expected an equals sign (\"=\") to mark the beginning of the attribute value.", | |
15c0b25d AP |
1337 | Subject: &next.Range, |
1338 | Context: hcl.RangeBetween(open.Range, next.Range).Ptr(), | |
1339 | }) | |
1340 | } | |
1341 | } | |
1342 | close = p.recover(TokenCBrace) | |
1343 | break | |
1344 | } | |
1345 | ||
1346 | p.Read() // eat equals sign or colon | |
1347 | ||
1348 | value, valueDiags := p.ParseExpression() | |
1349 | diags = append(diags, valueDiags...) | |
1350 | ||
1351 | if p.recovery && valueDiags.HasErrors() { | |
1352 | // If expression parsing failed then we are probably in a strange | |
1353 | // place in the token stream, so we'll bail out and try to reset | |
1354 | // to after our closing brace to allow parsing to continue. | |
1355 | close = p.recover(TokenCBrace) | |
1356 | break | |
1357 | } | |
1358 | ||
1359 | items = append(items, ObjectConsItem{ | |
1360 | KeyExpr: key, | |
1361 | ValueExpr: value, | |
1362 | }) | |
1363 | ||
1364 | next = p.Peek() | |
1365 | if next.Type == TokenCBrace { | |
1366 | close = p.Read() // eat closer | |
1367 | break | |
1368 | } | |
1369 | ||
1370 | if next.Type != TokenComma && next.Type != TokenNewline { | |
1371 | if !p.recovery { | |
1372 | diags = append(diags, &hcl.Diagnostic{ | |
1373 | Severity: hcl.DiagError, | |
107c1cdb ND |
1374 | Summary: "Missing attribute separator", |
1375 | Detail: "Expected a newline or comma to mark the beginning of the next attribute.", | |
15c0b25d AP |
1376 | Subject: &next.Range, |
1377 | Context: hcl.RangeBetween(open.Range, next.Range).Ptr(), | |
1378 | }) | |
1379 | } | |
1380 | close = p.recover(TokenCBrace) | |
1381 | break | |
1382 | } | |
1383 | ||
1384 | p.Read() // eat comma or newline | |
1385 | ||
1386 | } | |
1387 | ||
1388 | return &ObjectConsExpr{ | |
1389 | Items: items, | |
1390 | ||
1391 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1392 | OpenRange: open.Range, | |
1393 | }, diags | |
1394 | } | |
1395 | ||
1396 | func (p *parser) finishParsingForExpr(open Token) (Expression, hcl.Diagnostics) { | |
107c1cdb ND |
1397 | p.PushIncludeNewlines(false) |
1398 | defer p.PopIncludeNewlines() | |
15c0b25d AP |
1399 | introducer := p.Read() |
1400 | if !forKeyword.TokenMatches(introducer) { | |
1401 | // Should never happen if callers are behaving | |
1402 | panic("finishParsingForExpr called without peeker pointing to 'for' identifier") | |
1403 | } | |
1404 | ||
1405 | var makeObj bool | |
1406 | var closeType TokenType | |
1407 | switch open.Type { | |
1408 | case TokenOBrace: | |
1409 | makeObj = true | |
1410 | closeType = TokenCBrace | |
1411 | case TokenOBrack: | |
1412 | makeObj = false // making a tuple | |
1413 | closeType = TokenCBrack | |
1414 | default: | |
1415 | // Should never happen if callers are behaving | |
1416 | panic("finishParsingForExpr called with invalid open token") | |
1417 | } | |
1418 | ||
1419 | var diags hcl.Diagnostics | |
1420 | var keyName, valName string | |
1421 | ||
1422 | if p.Peek().Type != TokenIdent { | |
1423 | if !p.recovery { | |
1424 | diags = append(diags, &hcl.Diagnostic{ | |
1425 | Severity: hcl.DiagError, | |
1426 | Summary: "Invalid 'for' expression", | |
1427 | Detail: "For expression requires variable name after 'for'.", | |
1428 | Subject: p.Peek().Range.Ptr(), | |
1429 | Context: hcl.RangeBetween(open.Range, p.Peek().Range).Ptr(), | |
1430 | }) | |
1431 | } | |
1432 | close := p.recover(closeType) | |
1433 | return &LiteralValueExpr{ | |
1434 | Val: cty.DynamicVal, | |
1435 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1436 | }, diags | |
1437 | } | |
1438 | ||
1439 | valName = string(p.Read().Bytes) | |
1440 | ||
1441 | if p.Peek().Type == TokenComma { | |
1442 | // What we just read was actually the key, then. | |
1443 | keyName = valName | |
1444 | p.Read() // eat comma | |
1445 | ||
1446 | if p.Peek().Type != TokenIdent { | |
1447 | if !p.recovery { | |
1448 | diags = append(diags, &hcl.Diagnostic{ | |
1449 | Severity: hcl.DiagError, | |
1450 | Summary: "Invalid 'for' expression", | |
1451 | Detail: "For expression requires value variable name after comma.", | |
1452 | Subject: p.Peek().Range.Ptr(), | |
1453 | Context: hcl.RangeBetween(open.Range, p.Peek().Range).Ptr(), | |
1454 | }) | |
1455 | } | |
1456 | close := p.recover(closeType) | |
1457 | return &LiteralValueExpr{ | |
1458 | Val: cty.DynamicVal, | |
1459 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1460 | }, diags | |
1461 | } | |
1462 | ||
1463 | valName = string(p.Read().Bytes) | |
1464 | } | |
1465 | ||
1466 | if !inKeyword.TokenMatches(p.Peek()) { | |
1467 | if !p.recovery { | |
1468 | diags = append(diags, &hcl.Diagnostic{ | |
1469 | Severity: hcl.DiagError, | |
1470 | Summary: "Invalid 'for' expression", | |
107c1cdb | 1471 | Detail: "For expression requires the 'in' keyword after its name declarations.", |
15c0b25d AP |
1472 | Subject: p.Peek().Range.Ptr(), |
1473 | Context: hcl.RangeBetween(open.Range, p.Peek().Range).Ptr(), | |
1474 | }) | |
1475 | } | |
1476 | close := p.recover(closeType) | |
1477 | return &LiteralValueExpr{ | |
1478 | Val: cty.DynamicVal, | |
1479 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1480 | }, diags | |
1481 | } | |
1482 | p.Read() // eat 'in' keyword | |
1483 | ||
1484 | collExpr, collDiags := p.ParseExpression() | |
1485 | diags = append(diags, collDiags...) | |
1486 | if p.recovery && collDiags.HasErrors() { | |
1487 | close := p.recover(closeType) | |
1488 | return &LiteralValueExpr{ | |
1489 | Val: cty.DynamicVal, | |
1490 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1491 | }, diags | |
1492 | } | |
1493 | ||
1494 | if p.Peek().Type != TokenColon { | |
1495 | if !p.recovery { | |
1496 | diags = append(diags, &hcl.Diagnostic{ | |
1497 | Severity: hcl.DiagError, | |
1498 | Summary: "Invalid 'for' expression", | |
107c1cdb | 1499 | Detail: "For expression requires a colon after the collection expression.", |
15c0b25d AP |
1500 | Subject: p.Peek().Range.Ptr(), |
1501 | Context: hcl.RangeBetween(open.Range, p.Peek().Range).Ptr(), | |
1502 | }) | |
1503 | } | |
1504 | close := p.recover(closeType) | |
1505 | return &LiteralValueExpr{ | |
1506 | Val: cty.DynamicVal, | |
1507 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1508 | }, diags | |
1509 | } | |
1510 | p.Read() // eat colon | |
1511 | ||
1512 | var keyExpr, valExpr Expression | |
1513 | var keyDiags, valDiags hcl.Diagnostics | |
1514 | valExpr, valDiags = p.ParseExpression() | |
1515 | if p.Peek().Type == TokenFatArrow { | |
1516 | // What we just parsed was actually keyExpr | |
1517 | p.Read() // eat the fat arrow | |
1518 | keyExpr, keyDiags = valExpr, valDiags | |
1519 | ||
1520 | valExpr, valDiags = p.ParseExpression() | |
1521 | } | |
1522 | diags = append(diags, keyDiags...) | |
1523 | diags = append(diags, valDiags...) | |
1524 | if p.recovery && (keyDiags.HasErrors() || valDiags.HasErrors()) { | |
1525 | close := p.recover(closeType) | |
1526 | return &LiteralValueExpr{ | |
1527 | Val: cty.DynamicVal, | |
1528 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1529 | }, diags | |
1530 | } | |
1531 | ||
1532 | group := false | |
1533 | var ellipsis Token | |
1534 | if p.Peek().Type == TokenEllipsis { | |
1535 | ellipsis = p.Read() | |
1536 | group = true | |
1537 | } | |
1538 | ||
1539 | var condExpr Expression | |
1540 | var condDiags hcl.Diagnostics | |
1541 | if ifKeyword.TokenMatches(p.Peek()) { | |
1542 | p.Read() // eat "if" | |
1543 | condExpr, condDiags = p.ParseExpression() | |
1544 | diags = append(diags, condDiags...) | |
1545 | if p.recovery && condDiags.HasErrors() { | |
1546 | close := p.recover(p.oppositeBracket(open.Type)) | |
1547 | return &LiteralValueExpr{ | |
1548 | Val: cty.DynamicVal, | |
1549 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1550 | }, diags | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | var close Token | |
1555 | if p.Peek().Type == closeType { | |
1556 | close = p.Read() | |
1557 | } else { | |
1558 | if !p.recovery { | |
1559 | diags = append(diags, &hcl.Diagnostic{ | |
1560 | Severity: hcl.DiagError, | |
1561 | Summary: "Invalid 'for' expression", | |
1562 | Detail: "Extra characters after the end of the 'for' expression.", | |
1563 | Subject: p.Peek().Range.Ptr(), | |
1564 | Context: hcl.RangeBetween(open.Range, p.Peek().Range).Ptr(), | |
1565 | }) | |
1566 | } | |
1567 | close = p.recover(closeType) | |
1568 | } | |
1569 | ||
1570 | if !makeObj { | |
1571 | if keyExpr != nil { | |
1572 | diags = append(diags, &hcl.Diagnostic{ | |
1573 | Severity: hcl.DiagError, | |
1574 | Summary: "Invalid 'for' expression", | |
1575 | Detail: "Key expression is not valid when building a tuple.", | |
1576 | Subject: keyExpr.Range().Ptr(), | |
1577 | Context: hcl.RangeBetween(open.Range, close.Range).Ptr(), | |
1578 | }) | |
1579 | } | |
1580 | ||
1581 | if group { | |
1582 | diags = append(diags, &hcl.Diagnostic{ | |
1583 | Severity: hcl.DiagError, | |
1584 | Summary: "Invalid 'for' expression", | |
1585 | Detail: "Grouping ellipsis (...) cannot be used when building a tuple.", | |
1586 | Subject: &ellipsis.Range, | |
1587 | Context: hcl.RangeBetween(open.Range, close.Range).Ptr(), | |
1588 | }) | |
1589 | } | |
1590 | } else { | |
1591 | if keyExpr == nil { | |
1592 | diags = append(diags, &hcl.Diagnostic{ | |
1593 | Severity: hcl.DiagError, | |
1594 | Summary: "Invalid 'for' expression", | |
1595 | Detail: "Key expression is required when building an object.", | |
1596 | Subject: valExpr.Range().Ptr(), | |
1597 | Context: hcl.RangeBetween(open.Range, close.Range).Ptr(), | |
1598 | }) | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | return &ForExpr{ | |
1603 | KeyVar: keyName, | |
1604 | ValVar: valName, | |
1605 | CollExpr: collExpr, | |
1606 | KeyExpr: keyExpr, | |
1607 | ValExpr: valExpr, | |
1608 | CondExpr: condExpr, | |
1609 | Group: group, | |
1610 | ||
1611 | SrcRange: hcl.RangeBetween(open.Range, close.Range), | |
1612 | OpenRange: open.Range, | |
1613 | CloseRange: close.Range, | |
1614 | }, diags | |
1615 | } | |
1616 | ||
1617 | // parseQuotedStringLiteral is a helper for parsing quoted strings that | |
1618 | // aren't allowed to contain any interpolations, such as block labels. | |
1619 | func (p *parser) parseQuotedStringLiteral() (string, hcl.Range, hcl.Diagnostics) { | |
1620 | oQuote := p.Read() | |
1621 | if oQuote.Type != TokenOQuote { | |
1622 | return "", oQuote.Range, hcl.Diagnostics{ | |
1623 | { | |
1624 | Severity: hcl.DiagError, | |
1625 | Summary: "Invalid string literal", | |
1626 | Detail: "A quoted string is required here.", | |
1627 | Subject: &oQuote.Range, | |
1628 | }, | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | var diags hcl.Diagnostics | |
1633 | ret := &bytes.Buffer{} | |
1634 | var cQuote Token | |
1635 | ||
1636 | Token: | |
1637 | for { | |
1638 | tok := p.Read() | |
1639 | switch tok.Type { | |
1640 | ||
1641 | case TokenCQuote: | |
1642 | cQuote = tok | |
1643 | break Token | |
1644 | ||
1645 | case TokenQuotedLit: | |
1646 | s, sDiags := p.decodeStringLit(tok) | |
1647 | diags = append(diags, sDiags...) | |
1648 | ret.WriteString(s) | |
1649 | ||
1650 | case TokenTemplateControl, TokenTemplateInterp: | |
1651 | which := "$" | |
1652 | if tok.Type == TokenTemplateControl { | |
107c1cdb | 1653 | which = "%" |
15c0b25d AP |
1654 | } |
1655 | ||
1656 | diags = append(diags, &hcl.Diagnostic{ | |
1657 | Severity: hcl.DiagError, | |
1658 | Summary: "Invalid string literal", | |
1659 | Detail: fmt.Sprintf( | |
1660 | "Template sequences are not allowed in this string. To include a literal %q, double it (as \"%s%s\") to escape it.", | |
1661 | which, which, which, | |
1662 | ), | |
1663 | Subject: &tok.Range, | |
1664 | Context: hcl.RangeBetween(oQuote.Range, tok.Range).Ptr(), | |
1665 | }) | |
107c1cdb ND |
1666 | |
1667 | // Now that we're returning an error callers won't attempt to use | |
1668 | // the result for any real operations, but they might try to use | |
1669 | // the partial AST for other analyses, so we'll leave a marker | |
1670 | // to indicate that there was something invalid in the string to | |
1671 | // help avoid misinterpretation of the partial result | |
1672 | ret.WriteString(which) | |
1673 | ret.WriteString("{ ... }") | |
1674 | ||
1675 | p.recover(TokenTemplateSeqEnd) // we'll try to keep parsing after the sequence ends | |
15c0b25d AP |
1676 | |
1677 | case TokenEOF: | |
1678 | diags = append(diags, &hcl.Diagnostic{ | |
1679 | Severity: hcl.DiagError, | |
1680 | Summary: "Unterminated string literal", | |
1681 | Detail: "Unable to find the closing quote mark before the end of the file.", | |
1682 | Subject: &tok.Range, | |
1683 | Context: hcl.RangeBetween(oQuote.Range, tok.Range).Ptr(), | |
1684 | }) | |
1685 | break Token | |
1686 | ||
1687 | default: | |
1688 | // Should never happen, as long as the scanner is behaving itself | |
1689 | diags = append(diags, &hcl.Diagnostic{ | |
1690 | Severity: hcl.DiagError, | |
1691 | Summary: "Invalid string literal", | |
1692 | Detail: "This item is not valid in a string literal.", | |
1693 | Subject: &tok.Range, | |
1694 | Context: hcl.RangeBetween(oQuote.Range, tok.Range).Ptr(), | |
1695 | }) | |
107c1cdb | 1696 | p.recover(TokenCQuote) |
15c0b25d AP |
1697 | break Token |
1698 | ||
1699 | } | |
1700 | ||
1701 | } | |
1702 | ||
1703 | return ret.String(), hcl.RangeBetween(oQuote.Range, cQuote.Range), diags | |
1704 | } | |
1705 | ||
1706 | // decodeStringLit processes the given token, which must be either a | |
1707 | // TokenQuotedLit or a TokenStringLit, returning the string resulting from | |
1708 | // resolving any escape sequences. | |
1709 | // | |
1710 | // If any error diagnostics are returned, the returned string may be incomplete | |
1711 | // or otherwise invalid. | |
1712 | func (p *parser) decodeStringLit(tok Token) (string, hcl.Diagnostics) { | |
1713 | var quoted bool | |
1714 | switch tok.Type { | |
1715 | case TokenQuotedLit: | |
1716 | quoted = true | |
1717 | case TokenStringLit: | |
1718 | quoted = false | |
1719 | default: | |
1720 | panic("decodeQuotedLit can only be used with TokenStringLit and TokenQuotedLit tokens") | |
1721 | } | |
1722 | var diags hcl.Diagnostics | |
1723 | ||
1724 | ret := make([]byte, 0, len(tok.Bytes)) | |
1725 | slices := scanStringLit(tok.Bytes, quoted) | |
1726 | ||
1727 | // We will mutate rng constantly as we walk through our token slices below. | |
1728 | // Any diagnostics must take a copy of this rng rather than simply pointing | |
1729 | // to it, e.g. by using rng.Ptr() rather than &rng. | |
1730 | rng := tok.Range | |
1731 | rng.End = rng.Start | |
1732 | ||
1733 | Slices: | |
1734 | for _, slice := range slices { | |
1735 | if len(slice) == 0 { | |
1736 | continue | |
1737 | } | |
1738 | ||
1739 | // Advance the start of our range to where the previous token ended | |
1740 | rng.Start = rng.End | |
1741 | ||
1742 | // Advance the end of our range to after our token. | |
1743 | b := slice | |
1744 | for len(b) > 0 { | |
1745 | adv, ch, _ := textseg.ScanGraphemeClusters(b, true) | |
1746 | rng.End.Byte += adv | |
1747 | switch ch[0] { | |
1748 | case '\r', '\n': | |
1749 | rng.End.Line++ | |
1750 | rng.End.Column = 1 | |
1751 | default: | |
1752 | rng.End.Column++ | |
1753 | } | |
1754 | b = b[adv:] | |
1755 | } | |
1756 | ||
1757 | TokenType: | |
1758 | switch slice[0] { | |
1759 | case '\\': | |
1760 | if !quoted { | |
1761 | // If we're not in quoted mode then just treat this token as | |
1762 | // normal. (Slices can still start with backslash even if we're | |
1763 | // not specifically looking for backslash sequences.) | |
1764 | break TokenType | |
1765 | } | |
1766 | if len(slice) < 2 { | |
1767 | diags = append(diags, &hcl.Diagnostic{ | |
1768 | Severity: hcl.DiagError, | |
1769 | Summary: "Invalid escape sequence", | |
1770 | Detail: "Backslash must be followed by an escape sequence selector character.", | |
1771 | Subject: rng.Ptr(), | |
1772 | }) | |
1773 | break TokenType | |
1774 | } | |
1775 | ||
1776 | switch slice[1] { | |
1777 | ||
1778 | case 'n': | |
1779 | ret = append(ret, '\n') | |
1780 | continue Slices | |
1781 | case 'r': | |
1782 | ret = append(ret, '\r') | |
1783 | continue Slices | |
1784 | case 't': | |
1785 | ret = append(ret, '\t') | |
1786 | continue Slices | |
1787 | case '"': | |
1788 | ret = append(ret, '"') | |
1789 | continue Slices | |
1790 | case '\\': | |
1791 | ret = append(ret, '\\') | |
1792 | continue Slices | |
1793 | case 'u', 'U': | |
1794 | if slice[1] == 'u' && len(slice) != 6 { | |
1795 | diags = append(diags, &hcl.Diagnostic{ | |
1796 | Severity: hcl.DiagError, | |
1797 | Summary: "Invalid escape sequence", | |
1798 | Detail: "The \\u escape sequence must be followed by four hexadecimal digits.", | |
1799 | Subject: rng.Ptr(), | |
1800 | }) | |
1801 | break TokenType | |
1802 | } else if slice[1] == 'U' && len(slice) != 10 { | |
1803 | diags = append(diags, &hcl.Diagnostic{ | |
1804 | Severity: hcl.DiagError, | |
1805 | Summary: "Invalid escape sequence", | |
1806 | Detail: "The \\U escape sequence must be followed by eight hexadecimal digits.", | |
1807 | Subject: rng.Ptr(), | |
1808 | }) | |
1809 | break TokenType | |
1810 | } | |
1811 | ||
1812 | numHex := string(slice[2:]) | |
1813 | num, err := strconv.ParseUint(numHex, 16, 32) | |
1814 | if err != nil { | |
1815 | // Should never happen because the scanner won't match | |
1816 | // a sequence of digits that isn't valid. | |
1817 | panic(err) | |
1818 | } | |
1819 | ||
1820 | r := rune(num) | |
1821 | l := utf8.RuneLen(r) | |
1822 | if l == -1 { | |
1823 | diags = append(diags, &hcl.Diagnostic{ | |
1824 | Severity: hcl.DiagError, | |
1825 | Summary: "Invalid escape sequence", | |
1826 | Detail: fmt.Sprintf("Cannot encode character U+%04x in UTF-8.", num), | |
1827 | Subject: rng.Ptr(), | |
1828 | }) | |
1829 | break TokenType | |
1830 | } | |
1831 | for i := 0; i < l; i++ { | |
1832 | ret = append(ret, 0) | |
1833 | } | |
1834 | rb := ret[len(ret)-l:] | |
1835 | utf8.EncodeRune(rb, r) | |
1836 | ||
1837 | continue Slices | |
1838 | ||
1839 | default: | |
1840 | diags = append(diags, &hcl.Diagnostic{ | |
1841 | Severity: hcl.DiagError, | |
1842 | Summary: "Invalid escape sequence", | |
1843 | Detail: fmt.Sprintf("The symbol %q is not a valid escape sequence selector.", slice[1:]), | |
1844 | Subject: rng.Ptr(), | |
1845 | }) | |
1846 | ret = append(ret, slice[1:]...) | |
1847 | continue Slices | |
1848 | } | |
1849 | ||
1850 | case '$', '%': | |
1851 | if len(slice) != 3 { | |
1852 | // Not long enough to be our escape sequence, so it's literal. | |
1853 | break TokenType | |
1854 | } | |
1855 | ||
1856 | if slice[1] == slice[0] && slice[2] == '{' { | |
1857 | ret = append(ret, slice[0]) | |
1858 | ret = append(ret, '{') | |
1859 | continue Slices | |
1860 | } | |
1861 | ||
1862 | break TokenType | |
1863 | } | |
1864 | ||
1865 | // If we fall out here or break out of here from the switch above | |
1866 | // then this slice is just a literal. | |
1867 | ret = append(ret, slice...) | |
1868 | } | |
1869 | ||
1870 | return string(ret), diags | |
1871 | } | |
1872 | ||
1873 | // setRecovery turns on recovery mode without actually doing any recovery. | |
1874 | // This can be used when a parser knowingly leaves the peeker in a useless | |
1875 | // place and wants to suppress errors that might result from that decision. | |
1876 | func (p *parser) setRecovery() { | |
1877 | p.recovery = true | |
1878 | } | |
1879 | ||
1880 | // recover seeks forward in the token stream until it finds TokenType "end", | |
1881 | // then returns with the peeker pointed at the following token. | |
1882 | // | |
1883 | // If the given token type is a bracketer, this function will additionally | |
1884 | // count nested instances of the brackets to try to leave the peeker at | |
1885 | // the end of the _current_ instance of that bracketer, skipping over any | |
1886 | // nested instances. This is a best-effort operation and may have | |
1887 | // unpredictable results on input with bad bracketer nesting. | |
1888 | func (p *parser) recover(end TokenType) Token { | |
1889 | start := p.oppositeBracket(end) | |
1890 | p.recovery = true | |
1891 | ||
1892 | nest := 0 | |
1893 | for { | |
1894 | tok := p.Read() | |
1895 | ty := tok.Type | |
1896 | if end == TokenTemplateSeqEnd && ty == TokenTemplateControl { | |
1897 | // normalize so that our matching behavior can work, since | |
1898 | // TokenTemplateControl/TokenTemplateInterp are asymmetrical | |
1899 | // with TokenTemplateSeqEnd and thus we need to count both | |
1900 | // openers if that's the closer we're looking for. | |
1901 | ty = TokenTemplateInterp | |
1902 | } | |
1903 | ||
1904 | switch ty { | |
1905 | case start: | |
1906 | nest++ | |
1907 | case end: | |
1908 | if nest < 1 { | |
1909 | return tok | |
1910 | } | |
1911 | ||
1912 | nest-- | |
1913 | case TokenEOF: | |
1914 | return tok | |
1915 | } | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | // recoverOver seeks forward in the token stream until it finds a block | |
1920 | // starting with TokenType "start", then finds the corresponding end token, | |
1921 | // leaving the peeker pointed at the token after that end token. | |
1922 | // | |
1923 | // The given token type _must_ be a bracketer. For example, if the given | |
1924 | // start token is TokenOBrace then the parser will be left at the _end_ of | |
1925 | // the next brace-delimited block encountered, or at EOF if no such block | |
1926 | // is found or it is unclosed. | |
1927 | func (p *parser) recoverOver(start TokenType) { | |
1928 | end := p.oppositeBracket(start) | |
1929 | ||
1930 | // find the opening bracket first | |
1931 | Token: | |
1932 | for { | |
1933 | tok := p.Read() | |
1934 | switch tok.Type { | |
1935 | case start, TokenEOF: | |
1936 | break Token | |
1937 | } | |
1938 | } | |
1939 | ||
1940 | // Now use our existing recover function to locate the _end_ of the | |
1941 | // container we've found. | |
1942 | p.recover(end) | |
1943 | } | |
1944 | ||
1945 | func (p *parser) recoverAfterBodyItem() { | |
1946 | p.recovery = true | |
1947 | var open []TokenType | |
1948 | ||
1949 | Token: | |
1950 | for { | |
1951 | tok := p.Read() | |
1952 | ||
1953 | switch tok.Type { | |
1954 | ||
1955 | case TokenNewline: | |
1956 | if len(open) == 0 { | |
1957 | break Token | |
1958 | } | |
1959 | ||
1960 | case TokenEOF: | |
1961 | break Token | |
1962 | ||
1963 | case TokenOBrace, TokenOBrack, TokenOParen, TokenOQuote, TokenOHeredoc, TokenTemplateInterp, TokenTemplateControl: | |
1964 | open = append(open, tok.Type) | |
1965 | ||
1966 | case TokenCBrace, TokenCBrack, TokenCParen, TokenCQuote, TokenCHeredoc: | |
1967 | opener := p.oppositeBracket(tok.Type) | |
1968 | for len(open) > 0 && open[len(open)-1] != opener { | |
1969 | open = open[:len(open)-1] | |
1970 | } | |
1971 | if len(open) > 0 { | |
1972 | open = open[:len(open)-1] | |
1973 | } | |
1974 | ||
1975 | case TokenTemplateSeqEnd: | |
1976 | for len(open) > 0 && open[len(open)-1] != TokenTemplateInterp && open[len(open)-1] != TokenTemplateControl { | |
1977 | open = open[:len(open)-1] | |
1978 | } | |
1979 | if len(open) > 0 { | |
1980 | open = open[:len(open)-1] | |
1981 | } | |
1982 | ||
1983 | } | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | // oppositeBracket finds the bracket that opposes the given bracketer, or | |
1988 | // NilToken if the given token isn't a bracketer. | |
1989 | // | |
1990 | // "Bracketer", for the sake of this function, is one end of a matching | |
1991 | // open/close set of tokens that establish a bracketing context. | |
1992 | func (p *parser) oppositeBracket(ty TokenType) TokenType { | |
1993 | switch ty { | |
1994 | ||
1995 | case TokenOBrace: | |
1996 | return TokenCBrace | |
1997 | case TokenOBrack: | |
1998 | return TokenCBrack | |
1999 | case TokenOParen: | |
2000 | return TokenCParen | |
2001 | case TokenOQuote: | |
2002 | return TokenCQuote | |
2003 | case TokenOHeredoc: | |
2004 | return TokenCHeredoc | |
2005 | ||
2006 | case TokenCBrace: | |
2007 | return TokenOBrace | |
2008 | case TokenCBrack: | |
2009 | return TokenOBrack | |
2010 | case TokenCParen: | |
2011 | return TokenOParen | |
2012 | case TokenCQuote: | |
2013 | return TokenOQuote | |
2014 | case TokenCHeredoc: | |
2015 | return TokenOHeredoc | |
2016 | ||
2017 | case TokenTemplateControl: | |
2018 | return TokenTemplateSeqEnd | |
2019 | case TokenTemplateInterp: | |
2020 | return TokenTemplateSeqEnd | |
2021 | case TokenTemplateSeqEnd: | |
2022 | // This is ambigous, but we return Interp here because that's | |
2023 | // what's assumed by the "recover" method. | |
2024 | return TokenTemplateInterp | |
2025 | ||
2026 | default: | |
2027 | return TokenNil | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | func errPlaceholderExpr(rng hcl.Range) Expression { | |
2032 | return &LiteralValueExpr{ | |
2033 | Val: cty.DynamicVal, | |
2034 | SrcRange: rng, | |
2035 | } | |
2036 | } |