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Add splats to dict & struct patterns in parser

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This commit is contained in:
Scott Richmond 2022-06-19 15:46:58 -04:00
parent 07c21494cf
commit e30a8b973b
1 changed files with 40 additions and 9 deletions
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41
src/ludus/parser.clj
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@ -484,7 +484,7 @@
(def sync-pattern (s/union sync-on #{::token/equals ::token/rarrow}))
(defn- parse-splat-pattern [origin]
(defn- parse-list-tuple-splat-pattern [origin]
(let [splatted (advance origin)]
(case (token-type splatted)
::token/word
@ -536,7 +536,7 @@
(panic (assoc origin ::errors (::errors parser)) "Unterminated list pattern" ::token/eof)
::token/splat
(let [splatted (parse-splat-pattern parser)]
(let [splatted (parse-list-tuple-splat-pattern parser)]
(recur splatted members (::ast splatted)))
(let [parsed (parse-pattern parser)]
@ -548,7 +548,8 @@
current_member nil]
(let [curr (current parser)]
(case (token-type parser)
::token/rbrace (let [ms (add-member members current_member)]
::token/rbrace
(let [ms (add-member members current_member)]
(assoc (advance parser) ::ast
{::ast/type ::ast/dict
:token (current origin)
@ -565,6 +566,21 @@
::token/eof
(panic (assoc origin ::errors (::errors parser)) "Unterminated dict pattern" ::token/eof)
::token/splat
(cond
current_member
(panic parser "Unexpected splat after keyword in dict pattern.")
(::ast/splatted members)
(panic parser "Dict patterns may only have one splat.")
(not= ::token/word (::token/type (current (advance parser))))
(panic parser "Splats in dicts may only splat into words.")
:else
(let [splatted (parse-word (advance parser))]
(recur splatted members {::ast/splatted (::ast splatted)})))
::token/word
(if (not current_member)
(let [parsed (parse-word parser) word (get-in parsed [::ast :word])]
@ -602,6 +618,21 @@
::token/eof
(panic (assoc origin ::errors (::errors parser)) "Unterminated struct pattern" ::token/eof)
::token/splat
(cond
current_member
(panic parser "Unexpected splat after keyword in struct pattern.")
(::ast/splatted members)
(panic parser "Struct patterns may only have one splat.")
(not= ::token/word (::token/type (current (advance parser))))
(panic parser "Splats in structs may only splat into words.")
:else
(let [splatted (parse-word (advance parser))]
(recur splatted members {::ast/splatted (::ast splatted)})))
::token/word
(if (not current_member)
(let [parsed (parse-word parser) word (get-in parsed [::ast :word])]
@ -646,7 +677,7 @@
(panic (assoc origin ::errors (::errors parser)) "Unterminated tuple" ::token/eof)
::token/splat
(let [splatted (parse-splat-pattern parser)]
(let [splatted (parse-list-tuple-splat-pattern parser)]
(recur splatted members (::ast splatted)))
(let [parsed (parse-pattern parser)]
@ -1113,7 +1144,7 @@
(do
(def pp pp/pprint)
(def source "let (a, ...b) = :foo")
(def source "let @{a, ...foo, :c d} = :foo")
(println "")
(println "")