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57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
315 lines
8.1 KiB
C++
315 lines
8.1 KiB
C++
//===-------------------------- regex.cpp ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "regex"
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#include "algorithm"
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#include "iterator"
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_LIBCPP_BEGIN_NAMESPACE_STD
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static
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const char*
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make_error_type_string(regex_constants::error_type ecode)
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{
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switch (ecode)
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{
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case regex_constants::error_collate:
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return "The expression contained an invalid collating element name.";
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case regex_constants::error_ctype:
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return "The expression contained an invalid character class name.";
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case regex_constants::error_escape:
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return "The expression contained an invalid escaped character, or a "
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"trailing escape.";
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case regex_constants::error_backref:
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return "The expression contained an invalid back reference.";
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case regex_constants::error_brack:
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return "The expression contained mismatched [ and ].";
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case regex_constants::error_paren:
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return "The expression contained mismatched ( and ).";
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case regex_constants::error_brace:
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return "The expression contained mismatched { and }.";
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case regex_constants::error_badbrace:
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return "The expression contained an invalid range in a {} expression.";
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case regex_constants::error_range:
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return "The expression contained an invalid character range, "
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"such as [b-a] in most encodings.";
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case regex_constants::error_space:
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return "There was insufficient memory to convert the expression into "
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"a finite state machine.";
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case regex_constants::error_badrepeat:
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return "One of *?+{ was not preceded by a valid regular expression.";
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case regex_constants::error_complexity:
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return "The complexity of an attempted match against a regular "
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"expression exceeded a pre-set level.";
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case regex_constants::error_stack:
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return "There was insufficient memory to determine whether the regular "
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"expression could match the specified character sequence.";
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case regex_constants::__re_err_grammar:
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return "An invalid regex grammar has been requested.";
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case regex_constants::__re_err_empty:
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return "An empty regex is not allowed in the POSIX grammar.";
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default:
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break;
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}
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return "Unknown error type";
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}
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regex_error::regex_error(regex_constants::error_type ecode)
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: runtime_error(make_error_type_string(ecode)),
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__code_(ecode)
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{}
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regex_error::~regex_error() throw() {}
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namespace {
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struct collationnames
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{
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const char* elem_;
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char char_;
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};
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const collationnames collatenames[] =
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{
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{"A", 0x41},
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{"B", 0x42},
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{"C", 0x43},
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{"D", 0x44},
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{"E", 0x45},
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{"F", 0x46},
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{"G", 0x47},
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{"H", 0x48},
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{"I", 0x49},
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{"J", 0x4a},
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{"K", 0x4b},
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{"L", 0x4c},
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{"M", 0x4d},
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{"N", 0x4e},
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{"NUL", 0x00},
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{"O", 0x4f},
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{"P", 0x50},
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{"Q", 0x51},
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{"R", 0x52},
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{"S", 0x53},
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{"T", 0x54},
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{"U", 0x55},
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{"V", 0x56},
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{"W", 0x57},
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{"X", 0x58},
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{"Y", 0x59},
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{"Z", 0x5a},
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{"a", 0x61},
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{"alert", 0x07},
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{"ampersand", 0x26},
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{"apostrophe", 0x27},
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{"asterisk", 0x2a},
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{"b", 0x62},
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{"backslash", 0x5c},
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{"backspace", 0x08},
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{"c", 0x63},
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{"carriage-return", 0x0d},
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{"circumflex", 0x5e},
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{"circumflex-accent", 0x5e},
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{"colon", 0x3a},
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{"comma", 0x2c},
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{"commercial-at", 0x40},
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{"d", 0x64},
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{"dollar-sign", 0x24},
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{"e", 0x65},
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{"eight", 0x38},
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{"equals-sign", 0x3d},
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{"exclamation-mark", 0x21},
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{"f", 0x66},
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{"five", 0x35},
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{"form-feed", 0x0c},
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{"four", 0x34},
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{"full-stop", 0x2e},
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{"g", 0x67},
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{"grave-accent", 0x60},
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{"greater-than-sign", 0x3e},
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{"h", 0x68},
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{"hyphen", 0x2d},
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{"hyphen-minus", 0x2d},
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{"i", 0x69},
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{"j", 0x6a},
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{"k", 0x6b},
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{"l", 0x6c},
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{"left-brace", 0x7b},
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{"left-curly-bracket", 0x7b},
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{"left-parenthesis", 0x28},
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{"left-square-bracket", 0x5b},
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{"less-than-sign", 0x3c},
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{"low-line", 0x5f},
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{"m", 0x6d},
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{"n", 0x6e},
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{"newline", 0x0a},
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{"nine", 0x39},
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{"number-sign", 0x23},
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{"o", 0x6f},
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{"one", 0x31},
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{"p", 0x70},
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{"percent-sign", 0x25},
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{"period", 0x2e},
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{"plus-sign", 0x2b},
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{"q", 0x71},
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{"question-mark", 0x3f},
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{"quotation-mark", 0x22},
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{"r", 0x72},
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{"reverse-solidus", 0x5c},
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{"right-brace", 0x7d},
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{"right-curly-bracket", 0x7d},
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{"right-parenthesis", 0x29},
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{"right-square-bracket", 0x5d},
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{"s", 0x73},
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{"semicolon", 0x3b},
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{"seven", 0x37},
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{"six", 0x36},
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{"slash", 0x2f},
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{"solidus", 0x2f},
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{"space", 0x20},
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{"t", 0x74},
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{"tab", 0x09},
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{"three", 0x33},
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{"tilde", 0x7e},
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{"two", 0x32},
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{"u", 0x75},
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{"underscore", 0x5f},
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{"v", 0x76},
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{"vertical-line", 0x7c},
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{"vertical-tab", 0x0b},
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{"w", 0x77},
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{"x", 0x78},
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{"y", 0x79},
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{"z", 0x7a},
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{"zero", 0x30}
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};
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struct classnames
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{
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const char* elem_;
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regex_traits<char>::char_class_type mask_;
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};
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const classnames ClassNames[] =
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{
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{"alnum", ctype_base::alnum},
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{"alpha", ctype_base::alpha},
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{"blank", ctype_base::blank},
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{"cntrl", ctype_base::cntrl},
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{"d", ctype_base::digit},
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{"digit", ctype_base::digit},
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{"graph", ctype_base::graph},
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{"lower", ctype_base::lower},
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{"print", ctype_base::print},
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{"punct", ctype_base::punct},
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{"s", ctype_base::space},
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{"space", ctype_base::space},
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{"upper", ctype_base::upper},
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{"w", regex_traits<char>::__regex_word},
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{"xdigit", ctype_base::xdigit}
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};
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struct use_strcmp
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{
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bool operator()(const collationnames& x, const char* y)
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{return strcmp(x.elem_, y) < 0;}
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bool operator()(const classnames& x, const char* y)
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{return strcmp(x.elem_, y) < 0;}
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};
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}
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string
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__get_collation_name(const char* s)
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{
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const collationnames* i =
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_VSTD::lower_bound(begin(collatenames), end(collatenames), s, use_strcmp());
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string r;
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if (i != end(collatenames) && strcmp(s, i->elem_) == 0)
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r = char(i->char_);
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return r;
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}
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regex_traits<char>::char_class_type
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__get_classname(const char* s, bool __icase)
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{
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const classnames* i =
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_VSTD::lower_bound(begin(ClassNames), end(ClassNames), s, use_strcmp());
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regex_traits<char>::char_class_type r = 0;
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if (i != end(ClassNames) && strcmp(s, i->elem_) == 0)
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{
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r = i->mask_;
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if (r == regex_traits<char>::__regex_word)
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r |= ctype_base::alnum | ctype_base::upper | ctype_base::lower;
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else if (__icase)
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{
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if (r & (ctype_base::lower | ctype_base::upper))
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r |= ctype_base::alpha;
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}
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}
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return r;
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}
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template <>
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void
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__match_any_but_newline<char>::__exec(__state& __s) const
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{
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if (__s.__current_ != __s.__last_)
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{
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switch (*__s.__current_)
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{
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case '\r':
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case '\n':
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__s.__do_ = __state::__reject;
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__s.__node_ = nullptr;
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break;
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default:
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__s.__do_ = __state::__accept_and_consume;
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++__s.__current_;
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__s.__node_ = this->first();
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break;
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}
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}
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else
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{
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__s.__do_ = __state::__reject;
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__s.__node_ = nullptr;
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}
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}
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template <>
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void
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__match_any_but_newline<wchar_t>::__exec(__state& __s) const
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{
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if (__s.__current_ != __s.__last_)
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{
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switch (*__s.__current_)
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{
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case '\r':
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case '\n':
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case 0x2028:
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case 0x2029:
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__s.__do_ = __state::__reject;
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__s.__node_ = nullptr;
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break;
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default:
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__s.__do_ = __state::__accept_and_consume;
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++__s.__current_;
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__s.__node_ = this->first();
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break;
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}
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}
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else
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{
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__s.__do_ = __state::__reject;
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__s.__node_ = nullptr;
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}
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}
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_LIBCPP_END_NAMESPACE_STD
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