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# This file is a part of Julia. License is MIT: https://julialang.org/license
## low-level pcre2 interface ##
module PCRE
import ..RefValue
include(string(length(Core.ARGS) >= 2 ? Core.ARGS[2] : "", "pcre_h.jl")) # include($BUILDROOT/base/pcre_h.jl)
const PCRE_LIB = "libpcre2-8"
const JIT_STACK = RefValue{Ptr{Cvoid}}(C_NULL)
const MATCH_CONTEXT = RefValue{Ptr{Cvoid}}(C_NULL)
function __init__()
try
JIT_STACK_START_SIZE = 32768
JIT_STACK_MAX_SIZE = 1048576
JIT_STACK[] = ccall((:pcre2_jit_stack_create_8, PCRE_LIB), Ptr{Cvoid},
(Cint, Cint, Ptr{Cvoid}),
JIT_STACK_START_SIZE, JIT_STACK_MAX_SIZE, C_NULL)
MATCH_CONTEXT[] = ccall((:pcre2_match_context_create_8, PCRE_LIB),
Ptr{Cvoid}, (Ptr{Cvoid},), C_NULL)
ccall((:pcre2_jit_stack_assign_8, PCRE_LIB), Cvoid,
(Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cvoid}), MATCH_CONTEXT[], C_NULL, JIT_STACK[])
catch ex
Base.showerror_nostdio(ex,
"WARNING: Error during initialization of module PCRE")
end
end
# supported options for different use cases
const COMPILE_MASK =
ANCHORED |
CASELESS |
DOLLAR_ENDONLY |
DOTALL |
EXTENDED |
FIRSTLINE |
MULTILINE |
NEWLINE_ANY |
NEWLINE_ANYCRLF |
NEWLINE_CR |
NEWLINE_CRLF |
NEWLINE_LF |
NO_AUTO_CAPTURE |
NO_START_OPTIMIZE |
NO_UTF_CHECK |
UNGREEDY |
UTF |
UCP
const EXECUTE_MASK =
NEWLINE_ANY |
NEWLINE_ANYCRLF |
NEWLINE_CR |
NEWLINE_CRLF |
NEWLINE_LF |
NOTBOL |
NOTEMPTY |
NOTEMPTY_ATSTART |
NOTEOL |
NO_START_OPTIMIZE |
NO_UTF_CHECK |
PARTIAL_HARD |
PARTIAL_SOFT
const OPTIONS_MASK = COMPILE_MASK | EXECUTE_MASK
const UNSET = ~Csize_t(0) # Indicates that an output vector element is unset
function info(regex::Ptr{Cvoid}, what::Integer, ::Type{T}) where T
buf = RefValue{T}()
ret = ccall((:pcre2_pattern_info_8, PCRE_LIB), Int32,
(Ptr{Cvoid}, Int32, Ptr{Cvoid}),
regex, what, buf)
if ret != 0
error(ret == ERROR_NULL ? "NULL regex object" :
ret == ERROR_BADMAGIC ? "invalid regex object" :
ret == ERROR_BADOPTION ? "invalid option flags" :
"unknown error $ret")
end
buf[]
end
function get_ovec(match_data)
ptr = ccall((:pcre2_get_ovector_pointer_8, PCRE_LIB), Ptr{Csize_t},
(Ptr{Cvoid},), match_data)
n = ccall((:pcre2_get_ovector_count_8, PCRE_LIB), UInt32,
(Ptr{Cvoid},), match_data)
unsafe_wrap(Array, ptr, 2n, own = false)
end
function compile(pattern::AbstractString, options::Integer)
errno = RefValue{Cint}(0)
erroff = RefValue{Csize_t}(0)
re_ptr = ccall((:pcre2_compile_8, PCRE_LIB), Ptr{Cvoid},
(Ptr{UInt8}, Csize_t, UInt32, Ref{Cint}, Ref{Csize_t}, Ptr{Cvoid}),
pattern, sizeof(pattern), options, errno, erroff, C_NULL)
re_ptr == C_NULL && error("PCRE compilation error: $(err_message(errno[])) at offset $(erroff[])")
re_ptr
end
function jit_compile(regex::Ptr{Cvoid})
errno = ccall((:pcre2_jit_compile_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, UInt32), regex, JIT_COMPLETE)
errno == 0 || error("PCRE JIT error: $(err_message(errno))")
end
free_match_data(match_data) =
ccall((:pcre2_match_data_free_8, PCRE_LIB), Cvoid, (Ptr{Cvoid},), match_data)
free_re(re) =
ccall((:pcre2_code_free_8, PCRE_LIB), Cvoid, (Ptr{Cvoid},), re)
free_jit_stack(stack) =
ccall((:pcre2_jit_stack_free_8, PCRE_LIB), Cvoid, (Ptr{Cvoid},), stack)
free_match_context(context) =
ccall((:pcre2_match_context_free_8, PCRE_LIB), Cvoid, (Ptr{Cvoid},), context)
function err_message(errno)
buffer = Vector{UInt8}(undef, 256)
ccall((:pcre2_get_error_message_8, PCRE_LIB), Cvoid,
(Int32, Ptr{UInt8}, Csize_t), errno, buffer, sizeof(buffer))
GC.@preserve buffer unsafe_string(pointer(buffer))
end
function exec(re,subject,offset,options,match_data)
rc = ccall((:pcre2_match_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, Ptr{UInt8}, Csize_t, Csize_t, Cuint, Ptr{Cvoid}, Ptr{Cvoid}),
re, subject, sizeof(subject), offset, options, match_data, MATCH_CONTEXT[])
# rc == -1 means no match, -2 means partial match.
rc < -2 && error("PCRE.exec error: $(err_message(rc))")
rc >= 0
end
function create_match_data(re)
ccall((:pcre2_match_data_create_from_pattern_8, PCRE_LIB),
Ptr{Cvoid}, (Ptr{Cvoid}, Ptr{Cvoid}), re, C_NULL)
end
function substring_number_from_name(re, name)
ccall((:pcre2_substring_number_from_name_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, Cstring), re, name)
end
function substring_length_bynumber(match_data, number)
s = RefValue{Csize_t}()
rc = ccall((:pcre2_substring_length_bynumber_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, UInt32, Ref{Csize_t}), match_data, number, s)
rc < 0 && error("PCRE error: $(err_message(rc))")
convert(Int, s[])
end
function substring_copy_bynumber(match_data, number, buf, buf_size)
s = RefValue{Csize_t}(buf_size)
rc = ccall((:pcre2_substring_copy_bynumber_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, UInt32, Ptr{UInt8}, Ref{Csize_t}),
match_data, number, buf, s)
rc < 0 && error("PCRE error: $(err_message(rc))")
convert(Int, s[])
end
function capture_names(re)
name_count = info(re, INFO_NAMECOUNT, UInt32)
name_entry_size = info(re, INFO_NAMEENTRYSIZE, UInt32)
nametable_ptr = info(re, INFO_NAMETABLE, Ptr{UInt8})
names = Dict{Int, String}()
for i=1:name_count
offset = (i-1)*name_entry_size + 1
# The capture group index corresponding to name 'i' is stored as a
# big-endian 16-bit value.
high_byte = UInt16(unsafe_load(nametable_ptr, offset))
low_byte = UInt16(unsafe_load(nametable_ptr, offset+1))
idx = (high_byte << 8) | low_byte
# The capture group name is a null-terminated string located directly
# after the index.
names[idx] = unsafe_string(nametable_ptr+offset+1)
end
names
end
end # module
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