39cb78a12d
\1..\9 now match the text captured by the corresponding group, so patterns like ([-*_])\1\1 or (\w+) \1 work. The parser records which groups are referenced; a referenced group additionally captures its text under a tag and the backref compiles to a PEG (backmatch). Only referenced groups change — they match possessively (the CPS-over-possessive-PEG engine can't backtrack into a tagged capture), so backtracking back into a backreferenced group isn't supported (rare). Unreferenced groups keep full backtracking and position-based result capture unchanged.
83 lines
5.2 KiB
Text
83 lines
5.2 KiB
Text
# Specification: regular expressions — #"…" literals and the re-* fns.
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# (Whole area previously unspecced; some cases adapted from jank reader-macro/regex.)
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(use ../support/harness)
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(defspec "regex / literals & predicate"
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["regex? literal" "true" "(regex? #\"\\d+\")"]
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["regex? non-regex" "false" "(regex? \"\\d+\")"]
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["escaped digits" "\"42\"" "(re-find #\"\\d+\" \"x42y\")"]
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["escaped ws/non-ws" "\"x a\"" "(re-find #\"\\S\\s\\S\" \"x a b y\")"])
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(defspec "regex / re-find"
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["match" "\"123\"" "(re-find #\"\\d+\" \"abc123def\")"]
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["no match nil" "nil" "(re-find #\"\\d+\" \"abc\")"]
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["with groups" "[\"a1\" \"a\" \"1\"]" "(re-find #\"([a-z])(\\d)\" \"--a1--\")"]
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["first match only" "\"1\"" "(re-find #\"\\d\" \"1 2 3\")"])
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(defspec "regex / re-matches"
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["full match" "\"123\"" "(re-matches #\"\\d+\" \"123\")"]
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["partial = nil" "nil" "(re-matches #\"\\d+\" \"123abc\")"]
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["groups" "[\"12\" \"1\" \"2\"]" "(re-matches #\"(\\d)(\\d)\" \"12\")"]
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["no match nil" "nil" "(re-matches #\"x+\" \"yyy\")"])
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(defspec "regex / re-seq"
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["all matches" "(quote (\"1\" \"22\" \"333\"))" "(re-seq #\"\\d+\" \"a1b22c333\")"]
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["empty when none" "nil" "(seq (re-seq #\"z\" \"abc\"))"]
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["words" "(quote (\"foo\" \"bar\"))" "(re-seq #\"\\w+\" \"foo bar\")"])
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(defspec "regex / re-pattern & string ops"
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["re-pattern build" "\"hi\"" "(re-find (re-pattern \"\\\\w+\") \"hi!\")"]
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["re-pattern is regex?" "true" "(regex? (re-pattern \"a\"))"]
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["split on regex" "[\"a\" \"b\" \"c\"]" "(do (require '[clojure.string :as s]) (s/split \"a1b2c\" #\"\\d\"))"]
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["replace regex" "\"X-X\"" "(do (require '[clojure.string :as s]) (s/replace \"a-b\" #\"[a-z]\" \"X\"))"]
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["replace $1" "\"[a][b]\"" "(do (require '[clojure.string :as s]) (s/replace \"ab\" #\"([a-z])\" \"[$1]\"))"])
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# Unicode property classes (jolt-xlp), byte-PEG approximation: ASCII exact,
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# any high byte (inside a UTF-8 sequence) counts as a LETTER for \p{L}.
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# Acceptance target was cuerdas (kebab/snake/capital now pass conformance).
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(defspec "regex / \\p property classes"
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["p{L} ascii" "\"hello\"" `(re-matches #"^\p{L}+$" "hello")`]
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["p{L} utf-8" "true" `(boolean (re-matches #"^\p{L}+$" "héllo"))`]
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["p{L} rejects digits" "false" `(boolean (re-matches #"^\p{L}+$" "ab1"))`]
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["p{N}" "(quote (\"12\" \"345\"))" `(re-seq #"\p{N}+" "a12b345")`]
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["P{N} negation" "\"abc\"" `(re-matches #"^\P{N}+$" "abc")`]
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["inside class" "\"a-1_b\"" `(re-matches #"^[\p{N}\p{L}_-]+$" "a-1_b")`]
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["p{Lu}/p{Ll}" "\"aB\"" `(re-matches #"^\p{Ll}\p{Lu}$" "aB")`]
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["p{Z} space" "\" \"" `(re-matches #"(?u)^[\s\p{Z}]+$" " ")`]
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["p{Ps}/p{Pe}" "\"(x)\"" `(re-matches #"^\p{Ps}x\p{Pe}$" "(x)")`]
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["(?u) accepted" "\"hi\"" `(re-matches #"(?u)^hi$" "hi")`]
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["unknown class throws" :throws `(re-pattern "\p{Greek}")`])
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# java.util.regex.Pattern statics (jolt-47b): compile returns jolt's native
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# regex value (so .split / str-ops accept it), MULTILINE maps to (?m), quote
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# escapes metachars. Plus the regex String methods migratus uses.
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(defspec "regex / Pattern statics & String regex methods"
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["Pattern/compile is a regex" "true" "(regex? (Pattern/compile \"a.c\"))"]
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["compiled .split" "[\"a\" \"b\" \"c\"]" "(.split (Pattern/compile \",\") \"a,b,c\")"]
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["str/replace w/ Pattern" "\"ab\"" "(do (require '[clojure.string :as s]) (s/replace \"a1b2\" (Pattern/compile \"[0-9]\") \"\"))"]
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["Pattern/MULTILINE ^" "true" "(boolean (re-find (Pattern/compile \"^x\" Pattern/MULTILINE) \"y\\nx\"))"]
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["Pattern/quote literal" "true" "(boolean (re-find (re-pattern (Pattern/quote \"a.c\")) \"za.cy\"))"]
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["Pattern/quote not meta" "false" "(boolean (re-find (re-pattern (Pattern/quote \"a.c\")) \"zabcy\"))"]
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[".matches whole string" "true" "(.matches \"abc\" \"a.c\")"]
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[".matches partial -> false" "false" "(.matches \"abcd\" \"a.c\")"]
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[".replaceAll regex" "\"a-b-c\"" "(.replaceAll \"a_b_c\" \"_\" \"-\")"]
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[".replaceFirst regex" "\"a-b_c\"" "(.replaceFirst \"a_b_c\" \"_\" \"-\")"])
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(defspec "regex / bounded quantifiers (jolt-3xur)"
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["exact {n}" "\"aaa\"" "(re-matches #\"a{3}\" \"aaa\")"]
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["range {n,m} max" "\"aaaa\"" "(re-find #\"a{2,4}\" \"aaaaa\")"]
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["zero lower {0,n}" "\"aa\"" "(re-find #\"a{0,3}\" \"aa\")"]
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["{n,} unbounded" "\"aaaa\"" "(re-find #\"a{2,}\" \"aaaa\")"]
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# nested bounded quantifiers must not blow up the PEG compiler — this used to
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# expand to ~2^61 nodes and hang at compile time.
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["nested bounds compile" "true"
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"(boolean (re-matches #\"[a-z](?:[a-z]{0,61}[a-z])?(?:-[a-z]{0,61}[a-z])*\" \"abc-def\"))"])
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(defspec "regex / backreferences (jolt-xtss)"
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["repeated char" "true" "(boolean (re-find #\"(.)\\1\" \"abba\"))"]
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["no repeat = nil" "nil" "(re-find #\"(.)\\1\" \"abc\")"]
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["thematic-break run" "true" "(boolean (re-matches #\"([-*_])\\1\\1\" \"---\"))"]
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["mismatched run" "nil" "(re-matches #\"([-*_])\\1\\1\" \"-*_\")"]
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["repeated word" "[\"the the\" \"the\"]" "(re-find #\"(\\w+) \\1\" \"say the the word\")"]
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["group still captures" "[\"x=x\" \"x\"]" "(re-matches #\"(\\w+)=\\1\" \"x=x\")"]
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["html tag pair" "true" "(boolean (re-matches #\"<(\\w+)>.*</\\1>\" \"<b>hi</b>\"))"])
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