340 lines
12 KiB
C++
340 lines
12 KiB
C++
// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/strings/internal/str_format/parser.h"
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#include <assert.h>
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#include <string.h>
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#include <wchar.h>
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#include <cctype>
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#include <cstdint>
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#include <algorithm>
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#include <initializer_list>
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#include <limits>
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#include <ostream>
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#include <string>
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#include <unordered_set>
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace str_format_internal {
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using CC = FormatConversionCharInternal;
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using LM = LengthMod;
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// Abbreviations to fit in the table below.
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constexpr auto f_sign = Flags::kSignCol;
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constexpr auto f_alt = Flags::kAlt;
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constexpr auto f_pos = Flags::kShowPos;
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constexpr auto f_left = Flags::kLeft;
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constexpr auto f_zero = Flags::kZero;
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ABSL_CONST_INIT const ConvTag kTags[256] = {
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{}, {}, {}, {}, {}, {}, {}, {}, // 00-07
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{}, {}, {}, {}, {}, {}, {}, {}, // 08-0f
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{}, {}, {}, {}, {}, {}, {}, {}, // 10-17
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{}, {}, {}, {}, {}, {}, {}, {}, // 18-1f
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f_sign, {}, {}, f_alt, {}, {}, {}, {}, // !"#$%&'
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{}, {}, {}, f_pos, {}, f_left, {}, {}, // ()*+,-./
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f_zero, {}, {}, {}, {}, {}, {}, {}, // 01234567
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{}, {}, {}, {}, {}, {}, {}, {}, // 89:;<=>?
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{}, CC::A, {}, {}, {}, CC::E, CC::F, CC::G, // @ABCDEFG
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{}, {}, {}, {}, LM::L, {}, {}, {}, // HIJKLMNO
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{}, {}, {}, {}, {}, {}, {}, {}, // PQRSTUVW
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CC::X, {}, {}, {}, {}, {}, {}, {}, // XYZ[\]^_
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{}, CC::a, {}, CC::c, CC::d, CC::e, CC::f, CC::g, // `abcdefg
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LM::h, CC::i, LM::j, {}, LM::l, {}, CC::n, CC::o, // hijklmno
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CC::p, LM::q, {}, CC::s, LM::t, CC::u, {}, {}, // pqrstuvw
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CC::x, {}, LM::z, {}, {}, {}, {}, {}, // xyz{|}!
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{}, {}, {}, {}, {}, {}, {}, {}, // 80-87
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{}, {}, {}, {}, {}, {}, {}, {}, // 88-8f
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{}, {}, {}, {}, {}, {}, {}, {}, // 90-97
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{}, {}, {}, {}, {}, {}, {}, {}, // 98-9f
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{}, {}, {}, {}, {}, {}, {}, {}, // a0-a7
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{}, {}, {}, {}, {}, {}, {}, {}, // a8-af
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{}, {}, {}, {}, {}, {}, {}, {}, // b0-b7
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{}, {}, {}, {}, {}, {}, {}, {}, // b8-bf
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{}, {}, {}, {}, {}, {}, {}, {}, // c0-c7
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{}, {}, {}, {}, {}, {}, {}, {}, // c8-cf
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{}, {}, {}, {}, {}, {}, {}, {}, // d0-d7
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{}, {}, {}, {}, {}, {}, {}, {}, // d8-df
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{}, {}, {}, {}, {}, {}, {}, {}, // e0-e7
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{}, {}, {}, {}, {}, {}, {}, {}, // e8-ef
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{}, {}, {}, {}, {}, {}, {}, {}, // f0-f7
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{}, {}, {}, {}, {}, {}, {}, {}, // f8-ff
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};
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namespace {
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bool CheckFastPathSetting(const UnboundConversion& conv) {
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bool width_precision_needed =
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conv.width.value() >= 0 || conv.precision.value() >= 0;
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if (width_precision_needed && conv.flags == Flags::kBasic) {
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fprintf(stderr,
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"basic=%d left=%d show_pos=%d sign_col=%d alt=%d zero=%d "
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"width=%d precision=%d\n",
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conv.flags == Flags::kBasic ? 1 : 0,
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FlagsContains(conv.flags, Flags::kLeft) ? 1 : 0,
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FlagsContains(conv.flags, Flags::kShowPos) ? 1 : 0,
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FlagsContains(conv.flags, Flags::kSignCol) ? 1 : 0,
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FlagsContains(conv.flags, Flags::kAlt) ? 1 : 0,
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FlagsContains(conv.flags, Flags::kZero) ? 1 : 0, conv.width.value(),
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conv.precision.value());
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return false;
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}
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return true;
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}
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template <bool is_positional>
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const char *ConsumeConversion(const char *pos, const char *const end,
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UnboundConversion *conv, int *next_arg) {
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const char* const original_pos = pos;
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char c;
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// Read the next char into `c` and update `pos`. Returns false if there are
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// no more chars to read.
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#define ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR() \
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do { \
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if (ABSL_PREDICT_FALSE(pos == end)) return nullptr; \
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c = *pos++; \
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} while (0)
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const auto parse_digits = [&] {
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int digits = c - '0';
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// We do not want to overflow `digits` so we consume at most digits10
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// digits. If there are more digits the parsing will fail later on when the
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// digit doesn't match the expected characters.
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int num_digits = std::numeric_limits<int>::digits10;
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for (;;) {
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if (ABSL_PREDICT_FALSE(pos == end)) break;
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c = *pos++;
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if (!std::isdigit(c)) break;
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--num_digits;
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if (ABSL_PREDICT_FALSE(!num_digits)) break;
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digits = 10 * digits + c - '0';
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}
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return digits;
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};
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if (is_positional) {
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
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conv->arg_position = parse_digits();
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assert(conv->arg_position > 0);
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if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
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}
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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// We should start with the basic flag on.
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assert(conv->flags == Flags::kBasic);
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// Any non alpha character makes this conversion not basic.
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// This includes flags (-+ #0), width (1-9, *) or precision (.).
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// All conversion characters and length modifiers are alpha characters.
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if (c < 'A') {
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while (c <= '0') {
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auto tag = GetTagForChar(c);
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if (tag.is_flags()) {
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conv->flags = conv->flags | tag.as_flags();
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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} else {
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break;
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}
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}
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if (c <= '9') {
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if (c >= '0') {
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int maybe_width = parse_digits();
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if (!is_positional && c == '$') {
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if (ABSL_PREDICT_FALSE(*next_arg != 0)) return nullptr;
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// Positional conversion.
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*next_arg = -1;
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return ConsumeConversion<true>(original_pos, end, conv, next_arg);
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}
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conv->flags = conv->flags | Flags::kNonBasic;
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conv->width.set_value(maybe_width);
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} else if (c == '*') {
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conv->flags = conv->flags | Flags::kNonBasic;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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if (is_positional) {
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if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
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conv->width.set_from_arg(parse_digits());
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if (ABSL_PREDICT_FALSE(c != '$')) return nullptr;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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} else {
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conv->width.set_from_arg(++*next_arg);
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}
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}
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}
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if (c == '.') {
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conv->flags = conv->flags | Flags::kNonBasic;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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if (std::isdigit(c)) {
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conv->precision.set_value(parse_digits());
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} else if (c == '*') {
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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if (is_positional) {
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if (ABSL_PREDICT_FALSE(c < '1' || c > '9')) return nullptr;
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conv->precision.set_from_arg(parse_digits());
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if (c != '$') return nullptr;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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} else {
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conv->precision.set_from_arg(++*next_arg);
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}
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} else {
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conv->precision.set_value(0);
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}
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}
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}
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auto tag = GetTagForChar(c);
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if (ABSL_PREDICT_FALSE(!tag.is_conv())) {
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if (ABSL_PREDICT_FALSE(!tag.is_length())) return nullptr;
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// It is a length modifier.
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using str_format_internal::LengthMod;
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LengthMod length_mod = tag.as_length();
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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if (c == 'h' && length_mod == LengthMod::h) {
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conv->length_mod = LengthMod::hh;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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} else if (c == 'l' && length_mod == LengthMod::l) {
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conv->length_mod = LengthMod::ll;
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ABSL_FORMAT_PARSER_INTERNAL_GET_CHAR();
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} else {
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conv->length_mod = length_mod;
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}
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tag = GetTagForChar(c);
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if (ABSL_PREDICT_FALSE(!tag.is_conv())) return nullptr;
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}
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assert(CheckFastPathSetting(*conv));
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(void)(&CheckFastPathSetting);
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conv->conv = tag.as_conv();
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if (!is_positional) conv->arg_position = ++*next_arg;
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return pos;
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}
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} // namespace
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std::string LengthModToString(LengthMod v) {
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switch (v) {
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case LengthMod::h:
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return "h";
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case LengthMod::hh:
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return "hh";
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case LengthMod::l:
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return "l";
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case LengthMod::ll:
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return "ll";
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case LengthMod::L:
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return "L";
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case LengthMod::j:
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return "j";
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case LengthMod::z:
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return "z";
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case LengthMod::t:
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return "t";
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case LengthMod::q:
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return "q";
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case LengthMod::none:
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return "";
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}
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return "";
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}
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const char *ConsumeUnboundConversion(const char *p, const char *end,
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UnboundConversion *conv, int *next_arg) {
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if (*next_arg < 0) return ConsumeConversion<true>(p, end, conv, next_arg);
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return ConsumeConversion<false>(p, end, conv, next_arg);
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}
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struct ParsedFormatBase::ParsedFormatConsumer {
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explicit ParsedFormatConsumer(ParsedFormatBase *parsedformat)
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: parsed(parsedformat), data_pos(parsedformat->data_.get()) {}
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bool Append(string_view s) {
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if (s.empty()) return true;
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size_t text_end = AppendText(s);
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if (!parsed->items_.empty() && !parsed->items_.back().is_conversion) {
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// Let's extend the existing text run.
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parsed->items_.back().text_end = text_end;
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} else {
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// Let's make a new text run.
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parsed->items_.push_back({false, text_end, {}});
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}
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return true;
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}
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bool ConvertOne(const UnboundConversion &conv, string_view s) {
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size_t text_end = AppendText(s);
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parsed->items_.push_back({true, text_end, conv});
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return true;
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}
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size_t AppendText(string_view s) {
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memcpy(data_pos, s.data(), s.size());
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data_pos += s.size();
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return static_cast<size_t>(data_pos - parsed->data_.get());
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}
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ParsedFormatBase *parsed;
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char* data_pos;
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};
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ParsedFormatBase::ParsedFormatBase(
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string_view format, bool allow_ignored,
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std::initializer_list<FormatConversionCharSet> convs)
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: data_(format.empty() ? nullptr : new char[format.size()]) {
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has_error_ = !ParseFormatString(format, ParsedFormatConsumer(this)) ||
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!MatchesConversions(allow_ignored, convs);
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}
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bool ParsedFormatBase::MatchesConversions(
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bool allow_ignored,
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std::initializer_list<FormatConversionCharSet> convs) const {
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std::unordered_set<int> used;
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auto add_if_valid_conv = [&](int pos, char c) {
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if (static_cast<size_t>(pos) > convs.size() ||
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!Contains(convs.begin()[pos - 1], c))
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return false;
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used.insert(pos);
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return true;
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};
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for (const ConversionItem &item : items_) {
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if (!item.is_conversion) continue;
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auto &conv = item.conv;
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if (conv.precision.is_from_arg() &&
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!add_if_valid_conv(conv.precision.get_from_arg(), '*'))
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return false;
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if (conv.width.is_from_arg() &&
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!add_if_valid_conv(conv.width.get_from_arg(), '*'))
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return false;
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if (!add_if_valid_conv(conv.arg_position,
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FormatConversionCharToChar(conv.conv)))
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return false;
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}
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return used.size() == convs.size() || allow_ignored;
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}
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} // namespace str_format_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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