httpserver supports a fixed port number
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Andreas Rumpf
parent
eca05d2a33
commit
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9 changed files with 278 additions and 201 deletions
211
lib/pure/re.nim
211
lib/pure/re.nim
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@ -9,28 +9,171 @@
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## Regular expression support for Nimrod. Consider using the pegs module
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## instead.
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## Currently this module is implemented by providing a wrapper around the
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## `PRCE (Perl-Compatible Regular Expressions) <http://www.pcre.org>`_
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## C library. This means that your application will depend on the PRCE
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## library's licence when using this module, which should not be a problem
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## though.
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## PRCE's licence follows:
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##
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## .. include:: ../doc/regexprs.txt
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##
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{.compile: "tre/tre_all.c".}
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from strutils import addf
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type
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TRegExDesc {.pure, final.} = object
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re_nsub: int # Number of parenthesized subexpressions.
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value: pointer # For internal use only.
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TRegEx* = ref TRegExDesc ## a compiled regular expression
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EInvalidRegEx* = object of EInvalidValue
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## is raised if the pattern is no valid regular expression.
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TRegMatch {.pure.} = object
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so, eo: cint
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import
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pcre, strutils
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const
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MaxSubpatterns* = 10
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## defines the maximum number of subpatterns that can be captured.
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## More subpatterns cannot be captured!
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type
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TRegExOptions* = enum ## options for regular expressions
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reIgnoreCase = 0, ## do caseless matching
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reMultiLine = 1, ## ``^`` and ``$`` match newlines within data
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reDotAll = 2, ## ``.`` matches anything including NL
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reExtended = 3, ## ignore whitespace and ``#`` comments
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PCRE_ANCHORED* = 0x00000010
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PCRE_DOLLAR_ENDONLY* = 0x00000020
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PCRE_EXTRA* = 0x00000040
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PCRE_NOTBOL* = 0x00000080
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PCRE_NOTEOL* = 0x00000100
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PCRE_UNGREEDY* = 0x00000200
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PCRE_NOTEMPTY* = 0x00000400
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PCRE_UTF8* = 0x00000800
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PCRE_NO_AUTO_CAPTURE* = 0x00001000
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TRegExDesc {.pure, final.} = object
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h: PPcre
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TRegEx* = ref TRegExDesc ## a compiled regular expression
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EInvalidRegEx* = object of EInvalidValue
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## is raised if the pattern is no valid regular expression.
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proc rawCompile(pattern: string, flags: cint): PPcre =
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var
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msg: CString
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offset: int
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com = pcreCompile(pattern, flags, addr(msg), addr(offset), nil)
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if com == nil:
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var e: ref EInvalidRegEx
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new(e)
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e.msg = $msg & "\n" & pattern & "\n" & repeatChar(offset) & "^\n"
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raise e
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return com
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proc finalizeRegEx(x: TRegEx) = dealloc(x.h)
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proc re*(s: string): TRegEx =
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## Constructor of regular expressions. Note that Nimrod's
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## extended raw string literals supports this syntax ``re"[abc]"`` as
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## a short form for ``re(r"[abc]")``.
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new(result, finalizeRegEx)
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result.h = rawCompile(s,
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var err = int(regncomp(addr(result^), s, s.len,
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cint(REG_EXTENDED or REG_NEWLINE)))
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if err != 0:
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var e: ref EInvalidRegEx
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new(e)
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e.msg = ErrorMessages[err]
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raise e
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proc xre*(pattern: string): TRegEx =
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## deletes whitespace from a pattern that is not escaped or in a character
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## class. Then it constructs a regular expresion object via `re`.
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## This is modelled after Perl's ``/x`` modifier.
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var p = ""
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var i = 0
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while i < pattern.len:
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case pattern[i]
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of ' ', '\t':
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inc i
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of '\\':
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add p, '\\'
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add p, pattern[i+1]
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inc i, 2
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of '[':
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while pattern[i] != ']' and pattern[i] != '\0':
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add p, pattern[i]
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inc i
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else:
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add p, pattern[i]
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inc i
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result = re(p)
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proc matchOrFind(s: string, pattern: PPcre, matches: var openarray[string],
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start: cint): cint =
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var
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rawMatches: array [0..maxSubpatterns * 3 - 1, cint]
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res = int(pcreExec(pattern, nil, s, len(s), start, 0,
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cast[ptr cint](addr(rawMatches)), maxSubpatterns * 3))
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dealloc(pattern)
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if res < 0: return res
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for i in 0..res-1:
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var
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a = rawMatches[i * 2]
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b = rawMatches[i * 2 + 1]
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if a >= 0'i32: matches[i] = copy(s, a, int(b)-1)
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else: matches[i] = ""
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return res
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proc matchOrFind(s: string, pattern: PPcre, start: cint): cint =
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var
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rawMatches: array [0..maxSubpatterns * 3 - 1, cint]
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res = pcreExec(pattern, nil, s, len(s), start, 0,
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cast[ptr cint](addr(rawMatches)), maxSubpatterns * 3)
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dealloc(pattern)
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return res
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proc match(s, pattern: string, matches: var openarray[string],
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start: int = 0): bool =
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return matchOrFind(s, rawCompile(pattern, PCRE_ANCHORED),
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matches, start) >= 0'i32
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proc matchLen(s, pattern: string, matches: var openarray[string],
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start: int = 0): int =
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return matchOrFind(s, rawCompile(pattern, PCRE_ANCHORED), matches, start)
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proc find(s, pattern: string, matches: var openarray[string],
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start: int = 0): bool =
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return matchOrFind(s, rawCompile(pattern, PCRE_MULTILINE),
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matches, start) >= 0'i32
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proc match(s, pattern: string, start: int = 0): bool =
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return matchOrFind(s, rawCompile(pattern, PCRE_ANCHORED), start) >= 0'i32
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proc find(s, pattern: string, start: int = 0): bool =
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return matchOrFind(s, rawCompile(pattern, PCRE_MULTILINE), start) >= 0'i32
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template `=~` *(s, pattern: expr): expr =
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## This calls ``match`` with an implicit declared ``matches`` array that
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## can be used in the scope of the ``=~`` call:
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##
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## .. code-block:: nimrod
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##
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## if line =~ r"\s*(\w+)\s*\=\s*(\w+)":
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## # matches a key=value pair:
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## echo("Key: ", matches[1])
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## echo("Value: ", matches[2])
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## elif line =~ r"\s*(\#.*)":
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## # matches a comment
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## # note that the implicit ``matches`` array is different from the
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## # ``matches`` array of the first branch
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## echo("comment: ", matches[1])
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## else:
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## echo("syntax error")
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##
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when not definedInScope(matches):
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var matches: array[0..maxSubPatterns-1, string]
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match(s, pattern, matches)
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proc regnexec(preg: ptr TRegExDesc, s: cstring, len, nmatch: int,
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pmatch: ptr array [0..maxSubpatterns-1, TRegMatch],
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eflags: cint): cint {.importc.}
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@ -75,44 +218,6 @@ const
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"Invalid use of repetition operators"
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]
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proc finalizeRegEx(x: TRegEx) = regfree(addr(x^))
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proc re*(s: string): TRegEx =
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## Constructor of regular expressions. Note that Nimrod's
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## extended raw string literals supports this syntax ``re"[abc]"`` as
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## a short form for ``re(r"[abc]")``.
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new(result, finalizeRegEx)
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var err = int(regncomp(addr(result^), s, s.len,
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cint(REG_EXTENDED or REG_NEWLINE)))
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if err != 0:
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var e: ref EInvalidRegEx
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new(e)
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e.msg = ErrorMessages[err]
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raise e
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proc xre*(pattern: string): TRegEx =
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## deletes whitespace from a pattern that is not escaped or in a character
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## class. Then it constructs a regular expresion object via `re`.
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## This is modelled after Perl's ``/x`` modifier.
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var p = ""
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var i = 0
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while i < pattern.len:
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case pattern[i]
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of ' ', '\t':
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inc i
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of '\\':
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add p, '\\'
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add p, pattern[i+1]
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inc i, 2
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of '[':
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while pattern[i] != ']' and pattern[i] != '\0':
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add p, pattern[i]
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inc i
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else:
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add p, pattern[i]
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inc i
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result = re(p)
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proc rawmatch(s: string, pattern: TRegEx, matches: var openarray[string],
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start: int): tuple[first, last: int] =
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var
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