775 lines
26 KiB
C++
775 lines
26 KiB
C++
/* file tokenizer.hpp
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*
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* author: Roland Conybeare, Jul 2024
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*/
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#pragma once
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#include "token.hpp"
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#include "span.hpp"
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#include "xo/indentlog/scope.hpp"
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#include <cassert>
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namespace xo {
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namespace scm {
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/**
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* Use:
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* @code
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* using tokenizer_type = tokenizer<char>;
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* using span_type = tokenizer_type::span_type;
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*
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* tokenizer_type tkz;
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* span_type input = ...;
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*
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* while !input.empty() {
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* auto res = tkz.scan(input);
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* const auto & tk = res.first;
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*
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* // do something with tk if tk.is_valid()
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*
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* input = input.after_prefix(res.second);
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* }
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*
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* if endofinput {
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* auto tk = tzk.notify_eof()
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*
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* // do something with tk if tk.is_valid()
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* }
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*
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* // expect !tkz.has_prefix()
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*
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* @endcode
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**/
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template <typename CharT>
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class tokenizer {
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public:
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using token_type = token<CharT>;
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using span_type = span<const CharT>;
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using scan_result = std::pair<token_type, span_type>;
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public:
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tokenizer() = default;
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/** identifies whitespace chars.
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* These are chars that do not belong to any token.
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* They are not permitted to appear within
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* a symbol or string token.
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* Appearance of a whitespace char forces completion of
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* preceding token.
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**/
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bool is_whitespace(CharT ch) const;
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/** identifies punctuation chars.
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* These are chars that are not permitted to appear within
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* a symbol token. Instead they force completion of
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* a preceding token, and start a new token with themselves
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**/
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bool is_1char_punctuation(CharT ch) const;
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/** more-relazed version of is_1char_punctuation.
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* Chars that are not permitted to appear within a symbol token,
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* but may form token combined with next character
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**/
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bool is_2char_punctuation(CharT ch) const;
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/** true if tokenizer contains stored prefix of
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* possibly-incomplete token
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**/
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bool has_prefix() const { return !prefix_.empty(); }
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/** assemble token from text @p token_text
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**/
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token_type assemble_token(const span_type & token_text) const;
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/** scan for next input token, given @p input.
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* Note tokenizer can consume input (e.g. whitespace)
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* without completing a token
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*
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* @return {parsed token, consumed span}
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**/
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scan_result scan(const span_type & input);
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/** When eof is false, same as scan(input).
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* When eof is true and scan(input) does not report a token,
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* return notify_eof()
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**/
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scan_result scan2(const span_type & input, bool eof);
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/** notify end of input, resolve any stored input **/
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token_type notify_eof();
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private:
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/** Accumulate partial token here.
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* This will happen if input sent to @ref tokenizer::scan
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* ends without a determinate token boundary.
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**/
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std::string prefix_;
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}; /*tokenizer*/
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template <typename CharT>
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bool
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tokenizer<CharT>::is_whitespace(CharT ch) const {
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switch(ch) {
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case ' ': return true;
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case '\t': return true;
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case '\n': return true;
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case '\r': return true;
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}
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return false;
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}
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template <typename CharT>
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bool
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tokenizer<CharT>::is_1char_punctuation(CharT ch) const {
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switch(ch) {
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case '<':
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return true;
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case '>':
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return true;
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case '(':
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return true;
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case ')':
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return true;
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case '[':
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return true;
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case ']':
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return true;
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case '{':
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return true;
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case '}':
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return true;
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case ',':
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return true;
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case ';':
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return true;
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case ':':
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/* can't be 1char punctuation -- can begin assignment token */
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return false;
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case '=':
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return true;
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case '-':
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/* can't be punctuation -- can appear inside f64 token: e.g. 1.23e-9 */
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return false;
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case '+':
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/* can't be punctuation -- can appear inside f64 token: e.g. 1.23e+4 */
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return false;
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case '*':
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/* not punctuation -- allowed in symbol */
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return false;
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case '/':
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/* not punctuation -- for symmetry with +,- */
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return false;
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case '.':
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/* can't be punctuation -- can appear inside f64 token: e.g. 1.23 */
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return false;
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}
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return false;
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}
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template <typename CharT>
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bool
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tokenizer<CharT>::is_2char_punctuation(CharT ch) const {
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switch(ch) {
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case ':':
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/* can begin := */
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return true;
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}
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return false;
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}
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template <typename CharT>
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auto
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tokenizer<CharT>::assemble_token(const span_type & token_text) const -> token_type
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{
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constexpr bool c_debug_flag = true;
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/* literal|pretty|streamlined */
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log_config::style = function_style::streamlined;
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scope log(XO_DEBUG(c_debug_flag));
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log && log(xtag("token_text", token_text));
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tokentype tk_type = tokentype::tk_invalid;
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std::string tk_text;
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const CharT * tk_start = token_text.lo();
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const CharT * tk_end = token_text.hi();
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const CharT * ix = tk_start;
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/* switch here applies to the first character in a token */
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switch (*ix) {
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case '-':
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case '+':
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if (token_text.size() == 1) {
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/* standalone '+' or '-' */
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if (*ix == '+')
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tk_type = tokentype::tk_plus;
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else if(*ix == '-')
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tk_type = tokentype::tk_minus;
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}
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/** fall through to numeric literal code below **/
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;
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case '.':
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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{
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/* examples of valid floating-point numbers:
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* .0
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* 1e0
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* 1e
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* 0.
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* +1e0
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* -1e0
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* +1E+2
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* -1E+2
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* -0.123e-10
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* non-examples:
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* .
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* -
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* +
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* e0
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* .e0
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* -.e-0
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* +.e+0
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*
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* in particular: to be recognized as a number,
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* must contain at least one digit
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*/
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log && log("possible number-token");
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/* true if initial sign -/+ encountered */
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bool sign_flag = false;
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/* true if '.' encountered */
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bool period_flag = false;
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/* true if 'e' | 'E' encountered.
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*/
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bool exponent_flag = false;
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/* true when sign '-' | '+' precedes exponenct digits */
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bool exponent_sign_flag = false;
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/* true when at least one digit follows exponent marker */
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bool exponent_digit_flag = false;
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/* true if at least one digit encountered */
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bool number_flag = false;
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/* token will be one of: {i64, f64, dot}: */
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for(; ix != token_text.hi(); ++ix) {
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if((*ix == '-') || (*ix == '+')) {
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/* sign allowed:
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* 1. before period and before first digit
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* 2. after exponent
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*/
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if (!period_flag && !number_flag && !sign_flag) {
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sign_flag = true;
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} else if (exponent_flag && !exponent_digit_flag) {
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exponent_sign_flag = true;
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} else {
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throw std::runtime_error
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(tostr("tokenizer::assemble_token",
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": improperly placed sign indicator",
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xtag("pos", ix - tk_start),
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xtag("char", *ix)));
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}
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} else if(*ix == '.') {
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if (period_flag) {
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throw (std::runtime_error
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(tostr("tokenizer::assemble_token",
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": duplicate decimal point",
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xtag("pos", ix - tk_start),
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xtag("char", *ix))));
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}
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period_flag = true;
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} else if((*ix == 'e') || (*ix == 'E')) {
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if (exponent_flag) {
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throw (std::runtime_error
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(tostr("tokenizer::assemble_token",
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": duplicate exponent marker",
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xtag("pos", ix - tk_start),
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xtag("char", *ix))));
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}
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exponent_flag = true;
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} else if(isdigit(*ix)) {
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if (exponent_flag) {
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/* need digit before exponent to recognize as number */
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exponent_digit_flag = true;
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} else {
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number_flag = true;
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}
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} else {
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/* invalid input */
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throw (std::runtime_error
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(tostr("tokenizer::assemble_token",
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": unexpected character in numeric constant",
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xtag("pos", ix - tk_start),
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xtag("char", *ix))));
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}
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}
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if (number_flag) {
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if (period_flag || exponent_flag) {
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tk_type = tokentype::tk_f64;
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} else {
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tk_type = tokentype::tk_i64;
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}
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} else if (period_flag && !exponent_flag) {
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tk_type = tokentype::tk_dot;
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} else {
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/* not a valid token */
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}
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log && log(xtag("sign_flag", sign_flag));
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log && log(xtag("period_flag", period_flag),
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xtag("exponent_flag", exponent_flag),
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xtag("exponent_sign_flag", exponent_sign_flag),
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xtag("number_flag", number_flag));
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log && log(xtag("tk_type", tk_type));
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break;
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}
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case '*':
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if (token_text.size() == 1) {
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/* standalone '*' */
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tk_type = tokentype::tk_star;
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++ix;
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} else {
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/* '*' isn't punctuation -- but may allow appearance in a longer token
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*
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* thinking that x*y is a symbol with an embedded '*' character;
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* in particular want to support kebab-case symbols like 'foo-config'
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*/
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}
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break;
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case '/':
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if (token_text.size() == 1) {
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/* standalone '/' */
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tk_type = tokentype::tk_slash;
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++ix;
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}
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break;
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case '"':
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{
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log && log("recognize string-token");
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tk_type = tokentype::tk_string;
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tk_text.reserve(token_text.hi() - token_text.lo());
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++ix; /*skip initial " char*/
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for (; ix != token_text.hi(); ++ix) {
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log && log(xtag("*ix", *ix));
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bool endofstring = false;
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switch(*ix) {
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case '"':
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endofstring = true;
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/* skip final " char, don't capture */
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++ix;
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break;
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case '\\':
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/* skip escape char, don't capture */
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++ix;
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if (ix == token_text.hi()) {
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throw std::runtime_error
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(tostr("tokenizer::assemble_token",
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": malformed string literal",
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xtag("input", std::string_view(token_text.lo(),
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token_text.hi()))));
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}
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switch(*ix) {
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case '\\':
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log && log(xtag("*ix", *ix), xtag("escaped", "t"));
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tk_text.push_back(*ix);
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break;
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case 'n':
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log && log(xtag("*ix", *ix), xtag("newline", "t"));
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tk_text.push_back('\n');
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break;
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case 't':
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log && log(xtag("*ix", *ix), xtag("tab", "t"));
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tk_text.push_back('\t');
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break;
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case 'r':
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log && log(xtag("*ix", *ix), xtag("cr", "t"));
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tk_text.push_back('\r');
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break;
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case '"':
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log && log(xtag("*ix", *ix), xtag("quote", "t"));
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tk_text.push_back('"');
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break;
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default:
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throw std::runtime_error
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(tostr("tokenizer::assemble_token",
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": unexpected \\-escaped char",
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xtag("char", *ix)));
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}
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break;
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default:
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tk_text.push_back(*ix);
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break;
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}
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if (endofstring)
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break;
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}
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if (ix != token_text.hi()) {
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throw std::runtime_error
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(tostr("tokenizer::assemble_token",
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": expected \" to end string literal",
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xtag("input", std::string_view(token_text.lo(),
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token_text.hi()))));
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}
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log && log(tostr("tokenizer::assemble_token",
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xtag("tk_text", tk_text)));
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break;
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}
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case 'a': case 'A':
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case 'b': case 'B':
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case 'c': case 'C':
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case 'd': case 'D':
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case 'e': case 'E':
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case 'f': case 'F':
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case 'g': case 'G':
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case 'h': case 'H':
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case 'i': case 'I':
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case 'j': case 'J':
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case 'k': case 'K':
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case 'l': case 'L':
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case 'm': case 'M':
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case 'n': case 'N':
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case 'o': case 'O':
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case 'p': case 'P':
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case 'q': case 'Q':
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case 'r': case 'R':
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case 's': case 'S':
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case 't': case 'T':
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case 'u': case 'U':
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case 'v': case 'V':
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case 'w': case 'W':
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case 'x': case 'X':
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case 'y': case 'Y':
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case 'z': case 'Z':
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{
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/* symbol/identifier must begin with a letter?
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* we want to accept some other chars too.
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* specifically want to allow identifiers:
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* this-is-the-way
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* this+is+also+the+way
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* how/much/is/that/doggy
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* put*an*asterisk*in*that
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* something%special%
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*
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* like pure lisp, we don't allow:
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* - identifier beginning with digit
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* - period .
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*
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* unlike pure lisp, we don't allow anywhere in a symbol:
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* - colon :
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* - semicolon ;
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* - comma ,
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*
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* also we don't allow symbols to begin with special chars
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*/
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tk_type = tokentype::tk_symbol;
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break;
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}
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case '<':
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tk_type = tokentype::tk_leftangle;
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++ix;
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break;
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case '>':
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tk_type = tokentype::tk_rightangle;
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++ix;
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break;
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case '(':
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tk_type = tokentype::tk_leftparen;
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++ix;
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break;
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case ')':
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tk_type = tokentype::tk_rightparen;
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++ix;
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break;
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case '[':
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tk_type = tokentype::tk_leftbracket;
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++ix;
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break;
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case ']':
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tk_type = tokentype::tk_rightbracket;
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++ix;
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break;
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case '{':
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tk_type = tokentype::tk_leftbrace;
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++ix;
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break;
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case '}':
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tk_type = tokentype::tk_rightbrace;
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++ix;
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break;
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case ',':
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tk_type = tokentype::tk_comma;
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++ix;
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break;
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case ';':
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tk_type = tokentype::tk_semicolon;
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++ix;
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break;
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case ':':
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{
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log && log("colon or assignment token");
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if (*(ix + 1) == '=') {
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tk_type = tokentype::tk_assign;
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++ix;
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++ix;
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} else {
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tk_type = tokentype::tk_colon;
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++ix;
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}
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break;
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}
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case '=':
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tk_type = tokentype::tk_singleassign;
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++ix;
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break;
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default:
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break;
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}
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if (tk_type == tokentype::tk_invalid) {
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throw std::runtime_error(tostr("tokenizer::assemble_token",
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": unexpected input x",
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xtag("x", *ix)));
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}
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if ((tk_type == tokentype::tk_i64)
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|| (tk_type == tokentype::tk_f64)
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|| (tk_type == tokentype::tk_symbol))
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{
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/* re-parse in token::i64_value() / token::f64_value() */
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tk_text = std::string(tk_start, tk_end);
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} else if (tk_type == tokentype::tk_string) {
|
|
; /* nothing to do here -- desired tk_text already constructed */
|
|
}
|
|
|
|
if (tk_type == tokentype::tk_symbol) {
|
|
/* check for keywords */
|
|
|
|
bool keep_text = false;
|
|
|
|
if (tk_text == "type") {
|
|
tk_type = tokentype::tk_type;
|
|
} else if (tk_text == "def") {
|
|
tk_type = tokentype::tk_def;
|
|
} else if (tk_text == "lambda") {
|
|
tk_type = tokentype::tk_lambda;
|
|
} else if (tk_text == "if") {
|
|
tk_type = tokentype::tk_if;
|
|
} else if (tk_text == "let") {
|
|
tk_type = tokentype::tk_let;
|
|
} else if (tk_text == "in") {
|
|
tk_type = tokentype::tk_in;
|
|
} else if (tk_text == "end") {
|
|
tk_type = tokentype::tk_end;
|
|
} else {
|
|
/* keep as symbol */
|
|
keep_text = true;
|
|
}
|
|
|
|
if (!keep_text)
|
|
tk_text.clear();
|
|
}
|
|
|
|
return token_type(tk_type, std::move(tk_text));
|
|
} /*assemble_token*/
|
|
|
|
template <typename CharT>
|
|
auto
|
|
tokenizer<CharT>::scan(const span_type & input) -> scan_result
|
|
{
|
|
constexpr bool c_debug_flag = true;
|
|
scope log(XO_DEBUG(c_debug_flag));
|
|
|
|
log && log(xtag("input", input));
|
|
|
|
const CharT * ix = input.lo();
|
|
|
|
/* skip whitespace */
|
|
while (is_whitespace(*ix) && (ix != input.hi()))
|
|
++ix;
|
|
|
|
if(ix == input.hi()) {
|
|
/* no-op */
|
|
return {
|
|
token_type::invalid(),
|
|
input.prefix_upto(ix)
|
|
};
|
|
}
|
|
|
|
/* here: *ix is not whitespace */
|
|
|
|
auto whitespace = input.prefix_upto(ix);
|
|
|
|
log && log(xtag("whitespace.size", whitespace.size()));
|
|
|
|
/* tk_start points to beginning of token
|
|
* (after any whitespace)
|
|
*/
|
|
const CharT * tk_start = ix;
|
|
|
|
if (is_1char_punctuation(*ix)) {
|
|
/* 1-character token */
|
|
++ix;
|
|
} else if (is_2char_punctuation(*ix)) {
|
|
CharT ch1 = *ix;
|
|
|
|
(void)ch1;
|
|
|
|
++ix;
|
|
|
|
if (ix == input.hi()) {
|
|
/* need more input to know if/when token complete */
|
|
this->prefix_ += std::string(tk_start, input.hi());
|
|
|
|
log && log(xtag("captured-prefix", this->prefix_));
|
|
} else {
|
|
CharT ch2 = *ix;
|
|
|
|
if (((ch2 >= '0') && (ch2 <= '9'))
|
|
|| ((ch2 >= 'A') && (ch2 <= 'Z'))
|
|
|| ((ch2 >= 'a') && (ch2 <= 'z')))
|
|
{
|
|
/* treat as 1 char punctuation */
|
|
;
|
|
} else {
|
|
/* include next char */
|
|
++ix;
|
|
}
|
|
}
|
|
} else if (*ix == '"') {
|
|
bool complete_flag = false;
|
|
|
|
/* 1. embedded space/tab allowed in string literal.
|
|
* 2. embedded newline/cr not allowed.
|
|
*/
|
|
CharT prev_ch = '"';
|
|
|
|
++ix;
|
|
|
|
for (; ix != input.hi(); ++ix) {
|
|
/* looking for unescaped " char to end literal */
|
|
if (*ix == '"') {
|
|
if (prev_ch != '\\') {
|
|
++ix; /* include terminating " for assemble_token */
|
|
complete_flag = true;
|
|
break;
|
|
}
|
|
} else if ((*ix == '\n') || (*ix == '\r')) {
|
|
throw std::runtime_error
|
|
(tostr("tokenizer::scan",
|
|
": must use \\n or \\r to encode newline/cr in"
|
|
" string literal"));
|
|
}
|
|
|
|
prev_ch = *ix;
|
|
}
|
|
|
|
if (!complete_flag) {
|
|
/* need more input to know if/when token complete */
|
|
this->prefix_ += std::string(tk_start, input.hi());
|
|
|
|
log && log(xtag("captured-prefix", this->prefix_));
|
|
}
|
|
} else {
|
|
/* scan until:
|
|
* - whitespace
|
|
* - punctuation
|
|
*/
|
|
for (; ix != input.hi(); ++ix) {
|
|
if (is_whitespace(*ix)
|
|
|| is_1char_punctuation(*ix)
|
|
|| is_2char_punctuation(*ix))
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ix == input.hi()) {
|
|
/* need more input to know if/when token complete */
|
|
this->prefix_ += std::string(tk_start, input.hi());
|
|
|
|
log && log(xtag("captured-prefix", this->prefix_));
|
|
}
|
|
}
|
|
|
|
auto token_span = input.after_prefix(whitespace).prefix_upto(ix);
|
|
|
|
token tk
|
|
= (this->prefix_.empty()
|
|
? assemble_token(token_span)
|
|
: token_type(tokentype::tk_invalid));
|
|
|
|
return scan_result
|
|
{ tk, input.prefix(whitespace.size() + token_span.size()) };
|
|
} /*scan*/
|
|
|
|
template <typename CharT>
|
|
auto
|
|
tokenizer<CharT>::scan2(const span_type & input, bool eof) -> scan_result {
|
|
auto sr = this->scan(input);
|
|
|
|
if (!sr.first.is_valid() && eof) {
|
|
sr.first = this->notify_eof();
|
|
/* always consume remainder of input here.
|
|
* ambiguous prefix can represent at most one token
|
|
*/
|
|
sr.second = input;
|
|
}
|
|
|
|
return sr;
|
|
}
|
|
|
|
template <typename CharT>
|
|
auto
|
|
tokenizer<CharT>::notify_eof() -> token_type {
|
|
constexpr bool c_debug_flag = true;
|
|
|
|
scope log(XO_DEBUG(c_debug_flag));
|
|
|
|
token tk
|
|
= (this->prefix_.empty()
|
|
? token_type(tokentype::tk_invalid)
|
|
: assemble_token(span_type(&prefix_[0],
|
|
&prefix_[prefix_.size()])));
|
|
|
|
this->prefix_.clear();
|
|
|
|
return tk;
|
|
} /*notify_eof*/
|
|
} /*namespace scm*/
|
|
} /*namespace xo*/
|
|
|
|
/* end tokenizer.hpp */
|