792 lines
23 KiB
C++
792 lines
23 KiB
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include <cctype>
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#include <string>
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#include "util/exception.h"
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#include "util/utf8.h"
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#include "library/type_context.h"
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#include "library/message_builder.h"
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#include "frontends/lean/scanner.h"
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#include "frontends/lean/tokens.h"
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#include "frontends/lean/parser_config.h"
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namespace lean {
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unsigned scanner::get_utf8_size(unsigned char c) {
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unsigned r = ::lean::get_utf8_size(c);
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if (r == 0)
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throw_exception("invalid utf-8 head character");
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return r;
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}
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unsigned char to_uchar(char c) { return static_cast<unsigned char>(c); }
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unsigned utf8_to_unicode(char const * begin, char const * end) {
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unsigned result = 0;
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if (begin == end)
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return result;
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auto it = begin;
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unsigned c = to_uchar(*it);
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++it;
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if (c < 128)
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return c;
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unsigned mask = (1u << 6) -1;
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unsigned hmask = mask;
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unsigned shift = 0;
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unsigned num_bits = 0;
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while ((c & 0xC0) == 0xC0) {
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c <<= 1;
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c &= 0xff;
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num_bits += 6;
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hmask >>= 1;
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shift++;
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result <<= 6;
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if (it == end)
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return 0;
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result |= *it & mask;
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++it;
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}
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result |= ((c >> shift) & hmask) << num_bits;
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return result;
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}
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bool is_greek_unicode(unsigned u) { return 0x391 <= u && u <= 0x3DD; }
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bool is_letter_like_unicode(unsigned u) {
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return
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(0x3b1 <= u && u <= 0x3c9 && u != 0x3bb) || // Lower greek, but lambda
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(0x391 <= u && u <= 0x3A9 && u != 0x3A0 && u != 0x3A3) || // Upper greek, but Pi and Sigma
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(0x3ca <= u && u <= 0x3fb) || // Coptic letters
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(0x1f00 <= u && u <= 0x1ffe) || // Polytonic Greek Extended Character Set
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(0x2100 <= u && u <= 0x214f); // Letter like block
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}
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bool is_sub_script_alnum_unicode(unsigned u) {
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return
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(0x207f <= u && u <= 0x2089) || // n superscript and numberic subscripts
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(0x2090 <= u && u <= 0x209c); // letter-like subscripts
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}
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void scanner::fetch_line() {
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m_curr_line.clear();
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if (std::getline(m_stream, m_curr_line)) {
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m_curr_line.push_back('\n');
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m_sline++;
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m_spos = 0;
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m_upos = 0;
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m_curr = m_curr_line[m_spos];
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m_uskip = get_utf8_size(m_curr);
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m_uskip--;
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} else {
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m_last_line = true;
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m_curr = EOF;
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}
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}
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void scanner::next() {
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lean_assert(m_curr != EOF);
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m_spos++;
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while (m_spos >= static_cast<int>(m_curr_line.size())) {
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if (m_last_line) {
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m_curr = EOF;
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return;
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} else {
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return fetch_line();
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}
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}
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m_curr = m_curr_line[m_spos];
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if (m_uskip > 0) {
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if (!is_utf8_next(m_curr))
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throw_exception("invalid utf-8 sequence character");
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m_uskip--;
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} else {
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m_upos++;
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m_uskip = get_utf8_size(m_curr);
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m_uskip--;
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}
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}
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void scanner::check_not_eof(char const * error_msg) {
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if (curr() == EOF) throw_exception(error_msg);
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}
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[[ noreturn ]] void scanner::throw_exception(char const * msg) {
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pos_info pos = {m_sline, m_upos};
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while (curr() != EOF && !std::isspace(curr()))
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next();
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throw parser_exception(msg, m_stream_name.c_str(), pos);
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}
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static char const * g_end_error_str_msg = "unexpected end of string";
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static char const * g_end_error_char_msg = "unexpected end of character";
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optional<unsigned> scanner::try_hex_to_unsigned(char c) {
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if ('0' <= c && c <= '9')
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return optional<unsigned>(c - '0');
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else if ('a' <= c && c <= 'f')
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return optional<unsigned>(10 + c - 'a');
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else if ('A' <= c && c <= 'F')
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return optional<unsigned>(10 + c - 'A');
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else
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return optional<unsigned>();
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}
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unsigned scanner::hex_to_unsigned(char c) {
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if (auto r = try_hex_to_unsigned(c))
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return *r;
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else
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throw_exception("invalid hexadecimal digit");
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}
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char scanner::read_quoted_char(char const * error_msg) {
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lean_assert(curr() == '\\');
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next();
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check_not_eof(error_msg);
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char c = curr();
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if (c != '\\' && c != '\"' && c != 'n' && c != 't' && c != '\'' && c != 'x')
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throw_exception("invalid escape sequence");
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if (c == 'n') {
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return '\n';
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} else if (c == 't') {
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return '\t';
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} else if (c == 'x') {
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next();
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char c = curr();
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unsigned v = hex_to_unsigned(c);
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next();
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c = curr();
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v = 16*v + hex_to_unsigned(c);
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return static_cast<char>(v);
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} else {
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return c;
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}
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}
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token_kind scanner::read_string() {
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lean_assert(curr() == '\"');
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next();
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m_buffer.clear();
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while (true) {
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check_not_eof(g_end_error_str_msg);
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char c = curr();
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if (c == '\"') {
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next();
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return token_kind::String;
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} else if (c == '\\') {
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c = read_quoted_char(g_end_error_str_msg);
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}
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m_buffer += c;
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next();
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}
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}
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auto scanner::read_char() -> token_kind {
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lean_assert(curr() == '\"');
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next();
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char c = curr();
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if (c == '\\')
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c = read_quoted_char(g_end_error_char_msg);
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next();
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if (curr() != '"')
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throw_exception("invalid character, \" expected");
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next();
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m_buffer.clear();
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m_buffer += c;
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return token_kind::Char;
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}
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auto scanner::read_quoted_symbol() -> token_kind {
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lean_assert(curr() == '`');
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next();
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if (std::isdigit(curr()))
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throw_exception("first character of a quoted symbols cannot be a digit");
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m_buffer.clear();
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bool start = true;
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bool trailing_space = false;
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while (true) {
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check_not_eof("unexpected quoted identifier");
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char c = curr();
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next();
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switch (c) {
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case '`':
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if (start)
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throw_exception("unexpected end of quoted symbol");
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m_name_val = name(m_buffer.c_str());
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return token_kind::QuotedSymbol;
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case '\"':
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case '\n':
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case '\t':
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throw_exception("invalid quoted symbol, invalid character");
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case ' ':
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if (!start)
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trailing_space = true;
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m_buffer += c;
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break;
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default:
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start = false;
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if (trailing_space)
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throw_exception("unexpected space inside of quoted symbol");
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m_buffer += c;
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}
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}
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}
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bool scanner::is_next_digit() {
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lean_assert(curr() != EOF);
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if (m_spos + 1 < static_cast<int>(m_curr_line.size()))
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return std::isdigit(m_curr_line[m_spos+1]);
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else
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return false;
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}
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auto scanner::read_hex_number() -> token_kind {
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lean_assert(curr() == 'x');
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next();
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m_num_val = 0;
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bool found = false;
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while (true) {
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char c = curr();
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if (auto d = try_hex_to_unsigned(c)) {
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found = true;
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m_num_val = 16 * m_num_val + *d;
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next();
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} else {
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break;
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}
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}
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if (!found)
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throw exception("invalid hexadecimal numeral, hexadecimal digit expected");
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return token_kind::Decimal;
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}
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optional<unsigned> scanner::try_digit_to_unsigned(int base, char c) {
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lean_assert(base == 2 || base == 8 || base == 10 || base == 16);
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if ('0' <= c && c <= '9') {
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if (base == 2 && c >= '2')
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throw_exception("invalid binary digit");
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if (base == 8 && c >= '8')
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throw_exception("invalid octal digit");
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return optional<unsigned>(c - '0');
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} else if (base == 16 && 'a' <= c && c <= 'f') {
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return optional<unsigned>(10 + c - 'a');
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} else if (base == 16 && 'A' <= c && c <= 'F') {
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return optional<unsigned>(10 + c - 'A');
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}
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return optional<unsigned>();
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}
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auto scanner::read_number() -> token_kind {
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lean_assert('0' <= curr() && curr() <= '9');
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mpq q(1);
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char c = curr();
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next();
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m_num_val = c - '0';
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// Check for alternate base when first digit is zero.
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int base = 10;
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if (m_num_val == 0) {
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switch (curr()) {
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case 'b':
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case 'B':
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base = 2;
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next();
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break;
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case 'o':
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case 'O':
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base = 8;
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next();
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break;
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case 'x':
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case 'X':
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base = 16;
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next();
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break;
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}
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// Read digit after prefix.
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if (base != 10) {
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if (auto r = try_digit_to_unsigned(base, curr())) {
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next();
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m_num_val = *r;
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} else {
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throw_exception("invalid numeral, expected digit after base prefix");
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}
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}
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}
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bool is_post_decimal = false; // Encountered a decimal point (requires base = 10)
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while (true) {
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c = curr();
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if (auto r = try_digit_to_unsigned(base, c)) {
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m_num_val = base*m_num_val + *r;
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if (is_post_decimal)
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q *= 10;
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next();
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} else if (base == 10 && c == '.') {
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// Num. is not a decimal. It should be at least Num.0
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if (is_next_digit()) {
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if (is_post_decimal)
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break;
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is_post_decimal = true;
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next();
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} else {
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break;
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}
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} else {
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break;
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}
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}
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if (is_post_decimal)
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m_num_val /= q;
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return is_post_decimal ? token_kind::Decimal : token_kind::Numeral;
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}
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void scanner::read_single_line_comment() {
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while (true) {
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if (curr() == '\n') {
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next();
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return;
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} else if (curr() == EOF) {
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return;
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} else {
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next();
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}
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}
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}
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void scanner::read_doc_block_core() {
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m_buffer.clear();
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while (true) {
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check_not_eof("unexpected end of documentation block");
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char c = curr();
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next();
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if (c == '-') {
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if (curr() == '/') {
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next();
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return;
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}
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}
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m_buffer += c;
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}
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}
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auto scanner::read_doc_block() -> token_kind {
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read_doc_block_core();
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return token_kind::DocBlock;
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}
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auto scanner::read_mod_doc_block() -> token_kind {
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read_doc_block_core();
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return token_kind::ModDocBlock;
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}
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void scanner::read_comment_block() {
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unsigned nesting = 1;
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while (true) {
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char c = curr();
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check_not_eof("unexpected end of comment block");
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next();
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if (c == '/') {
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if (curr() == '-') {
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next();
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nesting++;
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}
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} else if (c == '-') {
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if (curr() == '/') {
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next();
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nesting--;
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if (nesting == 0)
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return;
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}
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}
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}
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}
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// Read until the end_str is found, store all characters (not including end_str) in m_buffer.
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// Throw a parser exception error_msg if end of file is found before end_str.
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void scanner::read_until(char const * end_str, char const * error_msg) {
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lean_assert(end_str);
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lean_assert(end_str[0]);
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m_buffer.clear();
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while (true) {
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check_not_eof(error_msg);
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char c = curr_next();
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if (c == end_str[0]) {
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m_aux_buffer.clear();
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m_aux_buffer += c;
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unsigned i = 1;
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while (true) {
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if (!end_str[i])
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return;
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check_not_eof(error_msg);
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c = curr_next();
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if (c != end_str[i]) {
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m_buffer += m_aux_buffer;
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break;
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}
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i++;
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}
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} else {
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m_buffer += c;
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}
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}
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}
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void scanner::move_back(unsigned offset, unsigned u_offset) {
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lean_assert(m_uskip == 0);
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if (offset != 0) {
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if (curr() == EOF) {
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m_curr = 0;
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m_spos--;
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m_upos--;
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offset--;
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u_offset--;
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}
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if (offset != 0) {
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m_spos -= offset;
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m_upos -= u_offset;
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}
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next();
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}
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}
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void scanner::next_utf_core(char c, buffer<char> & cs) {
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cs.push_back(c);
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while (m_uskip > 0) {
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next();
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cs.push_back(curr());
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}
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}
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void scanner::next_utf(buffer<char> & cs) {
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next();
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next_utf_core(curr(), cs);
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}
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static bool is_id_first(buffer<char> const & cs, unsigned i) {
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if (std::isalpha(cs[i]) || cs[i] == '_' || cs[i] == '\'')
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return true;
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unsigned u = utf8_to_unicode(cs.begin() + i, cs.end());
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return is_letter_like_unicode(u);
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}
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bool is_id_rest(char const * begin, char const * end) {
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if (std::isalnum(*begin) || *begin == '_' || *begin == '\'')
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return true;
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unsigned u = utf8_to_unicode(begin, end);
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return is_letter_like_unicode(u) || is_sub_script_alnum_unicode(u);
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}
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static char const * g_error_key_msg = "unexpected token";
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auto scanner::read_key_cmd_id() -> token_kind {
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buffer<char> cs;
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next_utf_core(curr(), cs);
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unsigned num_utfs = 1;
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unsigned id_sz = 0;
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unsigned id_utf_sz = 0;
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if (is_id_first(cs, 0)) {
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id_sz = cs.size();
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while (true) {
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id_sz = cs.size();
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id_utf_sz = num_utfs;
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unsigned i = id_sz;
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next_utf(cs);
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num_utfs++;
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if (is_id_rest(&cs[i], cs.end())) {
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} else if (cs[i] == '.') {
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next_utf(cs);
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num_utfs++;
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if (!is_id_first(cs, i+1))
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break;
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} else {
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break;
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}
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}
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}
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unsigned i = 0;
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token_table const * it = m_tokens;
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token_info const * info = nullptr;
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unsigned key_sz = 0;
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unsigned key_utf_sz = 0;
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while (i < id_sz) {
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it = find(*it, cs[i]);
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i++;
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if (!it)
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break;
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if (auto new_info = value_of(*it)) {
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lean_assert(m_uskip == 0);
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info = new_info;
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key_sz = i;
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key_utf_sz = id_utf_sz; // this is imprecise if key_sz < id_sz, but this case is irrelevant
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}
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}
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while (it) {
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if (i == cs.size()) {
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next_utf(cs);
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num_utfs++;
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}
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it = find(*it, cs[i]);
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i++;
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if (!it)
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break;
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if (auto new_info = value_of(*it)) {
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lean_assert(m_uskip == 0);
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info = new_info;
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key_sz = i;
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key_utf_sz = num_utfs;
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lean_assert(key_sz > id_sz);
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}
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}
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if (id_sz == 0 && key_sz == 0)
|
|
throw_exception(g_error_key_msg);
|
|
if (id_sz > key_sz) {
|
|
move_back(cs.size() - id_sz, num_utfs - id_utf_sz);
|
|
m_name_val = name();
|
|
std::string & id_part = m_buffer;
|
|
id_part.clear();
|
|
for (unsigned i = 0; i < id_sz; i++) {
|
|
if (cs[i] == '.') {
|
|
m_name_val = name(m_name_val, id_part.c_str());
|
|
id_part.clear();
|
|
} else {
|
|
id_part.push_back(cs[i]);
|
|
}
|
|
}
|
|
m_name_val = name(m_name_val, id_part.c_str());
|
|
return token_kind::Identifier;
|
|
} else {
|
|
move_back(cs.size() - key_sz, num_utfs - key_utf_sz);
|
|
m_token_info = *info;
|
|
return m_token_info.is_command() ? token_kind::CommandKeyword : token_kind::Keyword;
|
|
}
|
|
}
|
|
|
|
static name * g_begin_comment_tk = nullptr;
|
|
static name * g_begin_comment_block_tk = nullptr;
|
|
static name * g_begin_doc_block_tk = nullptr;
|
|
static name * g_begin_mod_doc_block_tk = nullptr;
|
|
static name * g_pound_tk = nullptr;
|
|
|
|
void initialize_scanner() {
|
|
g_begin_comment_tk = new name("--");
|
|
g_begin_comment_block_tk = new name("/-");
|
|
g_begin_doc_block_tk = new name("/--");
|
|
g_begin_mod_doc_block_tk = new name("/-!");
|
|
g_pound_tk = new name("#");
|
|
}
|
|
|
|
void finalize_scanner() {
|
|
delete g_begin_comment_tk;
|
|
delete g_begin_comment_block_tk;
|
|
delete g_begin_doc_block_tk;
|
|
delete g_begin_mod_doc_block_tk;
|
|
delete g_pound_tk;
|
|
}
|
|
|
|
auto scanner::scan(environment const & env) -> token_kind {
|
|
m_tokens = &get_token_table(env);
|
|
while (true) {
|
|
char c = curr();
|
|
m_pos = m_upos;
|
|
m_line = m_sline;
|
|
switch (c) {
|
|
case ' ': case '\r': case '\t': case '\n':
|
|
next();
|
|
break;
|
|
case '\"':
|
|
return read_string();
|
|
case '`':
|
|
if (m_in_notation) {
|
|
return read_quoted_symbol();
|
|
} else {
|
|
return read_key_cmd_id();
|
|
}
|
|
case -1:
|
|
return token_kind::Eof;
|
|
default:
|
|
if (std::isdigit(c)) {
|
|
return read_number();
|
|
} else {
|
|
token_kind k = read_key_cmd_id();
|
|
if (k == token_kind::Keyword) {
|
|
// We treat '/-', '/--', '/-!', '--' as "keyword".
|
|
name const & n = m_token_info.value();
|
|
if (n == *g_begin_comment_tk)
|
|
read_single_line_comment();
|
|
else if (n == *g_begin_comment_block_tk)
|
|
read_comment_block();
|
|
else if (n == *g_begin_doc_block_tk)
|
|
return read_doc_block();
|
|
else if (n == *g_begin_mod_doc_block_tk)
|
|
return read_mod_doc_block();
|
|
else if (n == *g_pound_tk && curr() == '"')
|
|
return read_char();
|
|
else
|
|
return k;
|
|
} else {
|
|
return k;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
scanner::scanner(std::istream & strm, char const * strm_name):
|
|
m_tokens(nullptr), m_stream(strm) {
|
|
m_stream_name = strm_name ? strm_name : "[unknown]";
|
|
m_sline = 0;
|
|
m_spos = 0;
|
|
m_upos = 0;
|
|
m_uskip = 0;
|
|
m_in_notation = false;
|
|
m_last_line = false;
|
|
fetch_line();
|
|
m_line = m_sline;
|
|
m_pos = 0;
|
|
}
|
|
|
|
scanner::scanner(std::istream & strm, char const * strm_name, pos_info const & skip_to_pos) :
|
|
scanner(strm, strm_name) {
|
|
for (unsigned line_no = 1; line_no < skip_to_pos.first; line_no++)
|
|
fetch_line();
|
|
m_line = m_sline;
|
|
for (unsigned col_idx = 0; col_idx < skip_to_pos.second; col_idx++)
|
|
next();
|
|
}
|
|
|
|
std::ostream & operator<<(std::ostream & out, token_kind k) {
|
|
out << static_cast<unsigned>(k);
|
|
return out;
|
|
}
|
|
|
|
token::token(pos_info const & p):m_kind(token_kind::Eof), m_pos(p) {}
|
|
token::token(token_kind k, pos_info const & p, token_info const & info):
|
|
m_kind(k), m_pos(p), m_info(new token_info(info)) {
|
|
lean_assert(m_kind == token_kind::Keyword || m_kind == token_kind::CommandKeyword);
|
|
}
|
|
token::token(token_kind k, pos_info const & p, name const & v):
|
|
m_kind(k), m_pos(p), m_name_val(new name(v)) {
|
|
lean_assert(m_kind == token_kind::QuotedSymbol || m_kind == token_kind::Identifier);
|
|
}
|
|
token::token(token_kind k, pos_info const & p, mpq const & v):
|
|
m_kind(k), m_pos(p), m_num_val(new mpq (v)) {
|
|
lean_assert(m_kind == token_kind::Decimal || m_kind == token_kind::Numeral);
|
|
}
|
|
|
|
token::token(token_kind k, pos_info const & p, std::string const & v):
|
|
m_kind(k), m_pos(p), m_str_val(new std::string(v)) {
|
|
lean_assert(m_kind == token_kind::String || m_kind == token_kind::Char ||
|
|
m_kind == token_kind::DocBlock || m_kind == token_kind::ModDocBlock);
|
|
}
|
|
|
|
void token::dealloc() {
|
|
switch (kind()) {
|
|
case token_kind::Eof:
|
|
return;
|
|
case token_kind::Keyword: case token_kind::CommandKeyword:
|
|
if (m_info != nullptr) delete m_info;
|
|
return;
|
|
case token_kind::Identifier: case token_kind::QuotedSymbol:
|
|
if (m_name_val != nullptr) delete m_name_val;
|
|
return;
|
|
case token_kind::Numeral: case token_kind::Decimal:
|
|
if (m_num_val != nullptr) delete m_num_val;
|
|
return;
|
|
case token_kind::String: case token_kind::Char:
|
|
case token_kind::DocBlock: case token_kind::ModDocBlock:
|
|
if (m_str_val != nullptr) delete m_str_val;
|
|
return;
|
|
}
|
|
}
|
|
|
|
void token::copy(token const & tk) {
|
|
m_kind = tk.m_kind;
|
|
m_pos = tk.m_pos;
|
|
switch (tk.kind()) {
|
|
case token_kind::Eof:
|
|
return;
|
|
case token_kind::Keyword: case token_kind::CommandKeyword:
|
|
m_info = new token_info(*tk.m_info);
|
|
return;
|
|
case token_kind::Identifier: case token_kind::QuotedSymbol:
|
|
m_name_val = new name(*tk.m_name_val);
|
|
return;
|
|
case token_kind::Numeral: case token_kind::Decimal:
|
|
m_num_val = new mpq(*tk.m_num_val);
|
|
return;
|
|
case token_kind::String: case token_kind::Char:
|
|
case token_kind::DocBlock: case token_kind::ModDocBlock:
|
|
m_str_val = new std::string(*tk.m_str_val);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void token::steal(token && tk) {
|
|
m_kind = tk.m_kind;
|
|
m_pos = tk.m_pos;
|
|
switch (tk.kind()) {
|
|
case token_kind::Eof:
|
|
return;
|
|
case token_kind::Keyword: case token_kind::CommandKeyword:
|
|
m_info = tk.m_info;
|
|
tk.m_info = nullptr;
|
|
return;
|
|
case token_kind::Identifier: case token_kind::QuotedSymbol:
|
|
m_name_val = tk.m_name_val;
|
|
tk.m_name_val = nullptr;
|
|
return;
|
|
case token_kind::Numeral: case token_kind::Decimal:
|
|
m_num_val = tk.m_num_val;
|
|
tk.m_num_val = nullptr;
|
|
return;
|
|
case token_kind::String: case token_kind::Char:
|
|
case token_kind::DocBlock: case token_kind::ModDocBlock:
|
|
m_str_val = tk.m_str_val;
|
|
tk.m_str_val = nullptr;
|
|
return;
|
|
}
|
|
}
|
|
|
|
token read_tokens(environment & env, io_state const & ios, scanner & s, buffer<token> & tk, bool use_exceptions) {
|
|
while (true) {
|
|
try {
|
|
token_kind k = s.scan(env);
|
|
switch (k) {
|
|
case token_kind::Eof:
|
|
return token(s.get_pos_info());
|
|
case token_kind::Keyword:
|
|
tk.push_back(token(k, s.get_pos_info(), s.get_token_info()));
|
|
break;
|
|
case token_kind::CommandKeyword:
|
|
if (s.get_token_info().value() == get_end_tk())
|
|
tk.push_back(token(k, s.get_pos_info(), s.get_token_info()));
|
|
else
|
|
return token(k, s.get_pos_info(), s.get_token_info());
|
|
break;
|
|
case token_kind::Identifier: case token_kind::QuotedSymbol:
|
|
tk.push_back(token(k, s.get_pos_info(), s.get_name_val()));
|
|
break;
|
|
case token_kind::Numeral: case token_kind::Decimal:
|
|
tk.push_back(token(k, s.get_pos_info(), s.get_num_val()));
|
|
break;
|
|
case token_kind::String: case token_kind::Char:
|
|
case token_kind::DocBlock: case token_kind::ModDocBlock:
|
|
tk.push_back(token(k, s.get_pos_info(), s.get_str_val()));
|
|
break;
|
|
}
|
|
} catch (throwable & ex) {
|
|
if (use_exceptions) {
|
|
throw;
|
|
} else {
|
|
message_builder builder(env, ios, s.get_stream_name(), s.get_pos_info(), ERROR);
|
|
builder.set_exception(ex);
|
|
builder.report();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|