259 lines
10 KiB
LLVM
259 lines
10 KiB
LLVM
/*
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* This Source Code Form is subject to the terms of the Mozilla Public License
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* v. 2.0. If a copy of the MPL was not distributed with this file, You can
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* obtain one at http://mozilla.org/MPL/2.0/.
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*/
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%{
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#define YY_NO_UNISTD_H
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#define YY_USER_ACTION this->location.columns(yyleng);
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#include <sstream>
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#include "parser.hh"
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#undef YY_DECL
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#define YY_DECL yy::parser::symbol_type elna::source::lexer::lex(elna::source::driver& driver)
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#define yyterminate() return yy::parser::make_YYEOF(this->location)
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%}
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%option c++ noyywrap never-interactive
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%option yyclass="elna::source::lexer"
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%%
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%{
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this->location.step();
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%}
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\-\-.* {
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/* Skip the comment */
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}
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[\ \t\r] ; /* Skip the whitespaces */
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\n+ {
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this->location.lines(yyleng);
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this->location.step();
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}
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if {
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return yy::parser::make_IF(this->location);
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}
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then {
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return yy::parser::make_THEN(this->location);
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}
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else {
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return yy::parser::make_ELSE(this->location);
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}
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while {
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return yy::parser::make_WHILE(this->location);
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}
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do {
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return yy::parser::make_DO(this->location);
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}
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proc {
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return yy::parser::make_PROCEDURE(this->location);
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}
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begin {
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return yy::parser::make_BEGIN_BLOCK(this->location);
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}
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end {
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return yy::parser::make_END_BLOCK(this->location);
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}
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extern {
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return yy::parser::make_EXTERN(this->location);
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}
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const {
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return yy::parser::make_CONST(this->location);
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}
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var {
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return yy::parser::make_VAR(this->location);
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}
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array {
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return yy::parser::make_ARRAY(this->location);
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}
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of {
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return yy::parser::make_OF(this->location);
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}
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type {
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return yy::parser::make_TYPE(this->location);
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}
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record {
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return yy::parser::make_RECORD(this->location);
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}
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union {
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return yy::parser::make_UNION(this->location);
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}
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pointer {
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return yy::parser::make_POINTER(this->location);
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}
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to {
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return yy::parser::make_TO(this->location);
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}
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true {
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return yy::parser::make_BOOLEAN(true, this->location);
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}
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false {
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return yy::parser::make_BOOLEAN(false, this->location);
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}
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and {
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return yy::parser::make_AND(this->location);
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}
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or {
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return yy::parser::make_OR(this->location);
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}
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not {
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return yy::parser::make_NOT(this->location);
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}
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return {
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return yy::parser::make_RETURN(this->location);
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}
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[A-Za-z_][A-Za-z0-9_]* {
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return yy::parser::make_IDENTIFIER(yytext, this->location);
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}
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[0-9]+u {
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return yy::parser::make_WORD(strtoul(yytext, NULL, 10), this->location);
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}
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[0-9]+ {
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return yy::parser::make_INTEGER(strtol(yytext, NULL, 10), this->location);
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}
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[0-9]+\.[0-9] {
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return yy::parser::make_FLOAT(strtof(yytext, NULL), this->location);
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}
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'[[:print:]]' {
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if (yytext[1] == '\\' || yytext[1] == '\'')
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{
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REJECT;
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}
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else
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{
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return yy::parser::make_CHARACTER(std::string(yytext, 1, 1), this->location);
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}
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}
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'\\x[0-9a-fA-F]{1,2}' {
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char character = static_cast<char>(std::stoi(yytext + 3, nullptr, 16));
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return yy::parser::make_CHARACTER(std::string(&character, 1), this->location);
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}
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'\\[0nabtfrv\\'"?]' {
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std::optional<char> escape = source::escape_char(yytext[2]);
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if (escape.has_value())
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{
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return yy::parser::make_CHARACTER(std::string(&escape.value(), 1), this->location);
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}
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else
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{
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REJECT;
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}
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}
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\"[[:print:]]*\" {
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std::string result;
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const char *current_position = yytext + 1;
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while (*current_position != '\0')
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{
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if (*current_position == '\\' && *(current_position + 1) == 'x')
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{
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current_position += 2;
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std::size_t processed;
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char character = static_cast<char>(std::stoi(current_position, &processed, 16));
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if (processed == 0)
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{
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REJECT;
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}
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else
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{
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current_position += processed - 1;
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result.push_back(character);
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}
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}
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else if (*current_position == '\\')
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{
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++current_position;
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std::optional<char> escape = source::escape_char(*current_position);
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if (escape.has_value())
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{
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result.push_back(escape.value());
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}
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else
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{
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REJECT;
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}
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}
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else
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{
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result.push_back(*current_position);
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}
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++current_position;
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}
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result.pop_back();
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return yy::parser::make_STRING(result, this->location);
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}
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\( {
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return yy::parser::make_LEFT_PAREN(this->location);
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}
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\) {
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return yy::parser::make_RIGHT_PAREN(this->location);
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}
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\[ {
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return yy::parser::make_LEFT_SQUARE(this->location);
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}
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\] {
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return yy::parser::make_RIGHT_SQUARE(this->location);
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}
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\>= {
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return yy::parser::make_GREATER_EQUAL(this->location);
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}
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\<= {
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return yy::parser::make_LESS_EQUAL(this->location);
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}
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\> {
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return yy::parser::make_GREATER_THAN(this->location);
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}
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\< {
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return yy::parser::make_LESS_THAN(this->location);
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}
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\/= {
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return yy::parser::make_NOT_EQUAL(this->location);
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}
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= {
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return yy::parser::make_EQUALS(this->location);
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}
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; {
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return yy::parser::make_SEMICOLON(this->location);
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}
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\. {
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return yy::parser::make_DOT(this->location);
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}
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, {
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return yy::parser::make_COMMA(this->location);
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}
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\+ {
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return yy::parser::make_PLUS(this->location);
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}
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\- {
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return yy::parser::make_MINUS(this->location);
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}
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\* {
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return yy::parser::make_MULTIPLICATION(this->location);
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}
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\/ {
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return yy::parser::make_DIVISION(this->location);
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}
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:= {
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return yy::parser::make_ASSIGNMENT(this->location);
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}
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: {
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return yy::parser::make_COLON(this->location);
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}
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\^ {
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return yy::parser::make_HAT(this->location);
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}
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@ {
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return yy::parser::make_AT(this->location);
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}
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. {
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std::stringstream ss;
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ss << "Illegal character 0x" << std::hex << static_cast<unsigned int>(yytext[0]);
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driver.error(this->location, ss.str());
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}
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%%
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