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propagate srcloc to error msg (fixes #4)

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pull/6/head
Matthew Butterick 7 years ago
parent 79cddb19f2
commit 253062bb9e
1 changed files with 15 additions and 10 deletions
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25
brag/brag/codegen/runtime.rkt
Unescape Escape View File

@ -68,24 +68,24 @@
(define (permissive-tokenizer)
(define next-token (tokenizer-thunk))
(let loop ([next-token next-token])
(let loop ([next-token next-token][start no-position][end no-position])
(match next-token
[(or (? eof-object?) (? void?))
(lookup 'EOF eof no-position no-position)]
(lookup 'EOF eof start end)]
[(? symbol?)
(lookup next-token next-token no-position no-position)]
(lookup next-token next-token start end)]
[(? string?)
(lookup (string->symbol next-token) next-token no-position no-position)]
(lookup (string->symbol next-token) next-token start end)]
[(? char?)
(lookup (string->symbol (string next-token)) next-token no-position no-position)]
(lookup (string->symbol (string next-token)) next-token start end)]
;; Compatibility
[(? lex:token?)
(loop (token (lex:token-name next-token)
(lex:token-value next-token)))]
(lex:token-value next-token)) start end)]
[(token-struct type val offset line column span skip?)
(cond [skip?
@ -108,8 +108,11 @@
((current-tokenizer-error-handler) type val
offset line column span)])]
;; for the next two cases:
;; carry the token's start and end position into the `a-position-token` recursion
;; so that if an error arises, it's reported as coming from the location of the containing token
[(lex:position-token t s e)
(define a-position-token (loop t))
(define a-position-token (loop t s e))
(lex:position-token (lex:position-token-token a-position-token)
(if (no-position? (lex:position-token-start-pos a-position-token))
s
@ -119,13 +122,15 @@
(lex:position-token-end-pos a-position-token)))]
[(lex:srcloc-token t loc)
(define a-position-token (loop t))
(define s (lex:position (srcloc-position loc) (srcloc-line loc) (srcloc-column loc)))
(define e (lex:position (+ (srcloc-position loc) (srcloc-span loc)) #f #f))
(define a-position-token (loop t s e))
(lex:position-token (lex:position-token-token a-position-token)
(if (no-position? (lex:position-token-start-pos a-position-token))
(lex:position (srcloc-position loc) (srcloc-line loc) (srcloc-column loc))
s
(lex:position-token-start-pos a-position-token))
(if (no-position? (lex:position-token-start-pos a-position-token))
(lex:position (+ (srcloc-position loc) (srcloc-span loc)) #f #f)
e
(lex:position-token-end-pos a-position-token)))]
[else

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