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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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namespace str_format_internal {
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namespace {
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bool CheckFastPathSetting(const UnboundConversion& conv) {
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bool should_be_basic = !conv.flags.left && //
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!conv.flags.show_pos && //
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!conv.flags.sign_col && //
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!conv.flags.alt && //
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!conv.flags.zero && //
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(conv.width.value() == -1) &&
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(conv.precision.value() == -1);
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if (should_be_basic != conv.flags.basic) {
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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.basic, conv.flags.left, conv.flags.show_pos,
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conv.flags.sign_col, conv.flags.alt, conv.flags.zero,
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conv.width.value(), conv.precision.value());
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}
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return should_be_basic == conv.flags.basic;
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}
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// Keep a single table for all the conversion chars and length modifiers.
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// We invert the length modifiers to make them negative so that we can easily
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// test for them.
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// Everything else is `none`, which is a negative constant.
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using CC = ConversionChar::Id;
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using LM = LengthMod::Id;
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static constexpr std::int8_t none = -128;
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static constexpr std::int8_t kIds[] = {
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none, none, none, none, none, none, none, none, // 00-07
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none, none, none, none, none, none, none, none, // 08-0f
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none, none, none, none, none, none, none, none, // 10-17
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none, none, none, none, none, none, none, none, // 18-1f
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none, none, none, none, none, none, none, none, // 20-27
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none, none, none, none, none, none, none, none, // 28-2f
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none, none, none, none, none, none, none, none, // 30-37
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none, none, none, none, none, none, none, none, // 38-3f
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none, CC::A, none, CC::C, none, CC::E, CC::F, CC::G, // @ABCDEFG
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none, none, none, none, ~LM::L, none, none, none, // HIJKLMNO
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none, none, none, CC::S, none, none, none, none, // PQRSTUVW
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CC::X, none, none, none, none, none, none, none, // XYZ[\]^_
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none, CC::a, none, CC::c, CC::d, CC::e, CC::f, CC::g, // `abcdefg
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~LM::h, CC::i, ~LM::j, none, ~LM::l, none, CC::n, CC::o, // hijklmno
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CC::p, ~LM::q, none, CC::s, ~LM::t, CC::u, none, none, // pqrstuvw
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CC::x, none, ~LM::z, none, none, none, none, none, // xyz{|}~!
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none, none, none, none, none, none, none, none, // 80-87
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none, none, none, none, none, none, none, none, // 88-8f
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none, none, none, none, none, none, none, none, // 90-97
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none, none, none, none, none, none, none, none, // 98-9f
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none, none, none, none, none, none, none, none, // a0-a7
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none, none, none, none, none, none, none, none, // a8-af
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none, none, none, none, none, none, none, none, // b0-b7
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none, none, none, none, none, none, none, none, // b8-bf
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none, none, none, none, none, none, none, none, // c0-c7
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none, none, none, none, none, none, none, none, // c8-cf
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none, none, none, none, none, none, none, none, // d0-d7
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none, none, none, none, none, none, none, none, // d8-df
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none, none, none, none, none, none, none, none, // e0-e7
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none, none, none, none, none, none, none, none, // e8-ef
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none, none, none, none, none, none, none, none, // f0-f7
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none, none, none, none, none, none, none, none, // f8-ff
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};
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template <bool is_positional>
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bool ConsumeConversion(string_view *src, UnboundConversion *conv,
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int *next_arg) {
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const char *pos = src->data();
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const char *const end = pos + src->size();
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char c;
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// Read the next char into `c` and update `pos`. Reads '\0' if at end.
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const auto get_char = [&] { c = pos == end ? '\0' : *pos++; };
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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 digits10-1
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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 - 2;
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for (get_char(); num_digits && std::isdigit(c); get_char()) {
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--num_digits;
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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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get_char();
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if (c < '1' || c > '9') return false;
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conv->arg_position = parse_digits();
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assert(conv->arg_position > 0);
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if (c != '$') return false;
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}
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get_char();
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// We should start with the basic flag on.
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assert(conv->flags.basic);
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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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conv->flags.basic = false;
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for (; c <= '0'; get_char()) {
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switch (c) {
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case '-':
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conv->flags.left = true;
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continue;
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case '+':
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conv->flags.show_pos = true;
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continue;
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case ' ':
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conv->flags.sign_col = true;
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continue;
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case '#':
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conv->flags.alt = true;
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continue;
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case '0':
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conv->flags.zero = true;
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continue;
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}
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break;
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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 (*next_arg != 0) return false;
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// Positional conversion.
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*next_arg = -1;
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conv->flags = Flags();
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conv->flags.basic = true;
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return ConsumeConversion<true>(src, conv, next_arg);
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}
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conv->width.set_value(maybe_width);
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} else if (c == '*') {
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get_char();
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if (is_positional) {
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if (c < '1' || c > '9') return false;
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conv->width.set_from_arg(parse_digits());
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if (c != '$') return false;
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get_char();
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} else {
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conv->width.set_from_arg(++*next_arg);
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}
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}
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}
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if (c == '.') {
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get_char();
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if (std::isdigit(c)) {
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conv->precision.set_value(parse_digits());
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} else if (c == '*') {
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get_char();
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if (is_positional) {
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if (c < '1' || c > '9') return false;
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conv->precision.set_from_arg(parse_digits());
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if (c != '$') return false;
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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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std::int8_t id = kIds[static_cast<unsigned char>(c)];
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if (id < 0) {
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if (id == none) return false;
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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 = LengthMod::FromId(static_cast<LM>(~id));
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get_char();
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if (c == 'h' && length_mod.id() == LengthMod::h) {
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conv->length_mod = LengthMod::FromId(LengthMod::hh);
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get_char();
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} else if (c == 'l' && length_mod.id() == LengthMod::l) {
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conv->length_mod = LengthMod::FromId(LengthMod::ll);
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get_char();
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} else {
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conv->length_mod = length_mod;
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}
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id = kIds[static_cast<unsigned char>(c)];
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if (id < 0) return false;
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}
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assert(CheckFastPathSetting(*conv));
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(void)(&CheckFastPathSetting);
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conv->conv = ConversionChar::FromId(static_cast<CC>(id));
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if (!is_positional) conv->arg_position = ++*next_arg;
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*src = string_view(pos, end - pos);
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return true;
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}
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} // namespace
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bool ConsumeUnboundConversion(string_view *src, UnboundConversion *conv,
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int *next_arg) {
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if (*next_arg < 0) return ConsumeConversion<true>(src, conv, next_arg);
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return ConsumeConversion<false>(src, 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(string_view format, bool allow_ignored,
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std::initializer_list<Conv> 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, std::initializer_list<Conv> 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, conv.conv.Char())) 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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} // namespace absl
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