/* Copyright (c) 2015, Matthias Schiffer All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "parser.hpp" #include namespace solar { enum parser_state { STATE_INIT, STATE_RULE_BAR, STATE_RULE_EQUAL, STATE_RULE, STATE_RULE_VAR_PRE, STATE_RULE_VAR, STATE_RULE_VAR_POST, STATE_TYPE, STATE_TYPE_NONTERM, STATE_TYPE_TERM, STATE_TYPE_TERM_BLOCK, }; struct parser { parser_state state; }; parser_t * parser_alloc(void) { parser_t *parser = (parser_t *)std::malloc(sizeof(parser_t)); parser->state = STATE_INIT; return parser; } int parser_push(parser_t *parser, int token, const parser_value_t *value, parser_state_t *state) { switch (parser->state) { case STATE_INIT: switch (token) { case TOK_SYMBOL_LC: parser->state = STATE_RULE_BAR; state->new_rule(value->str); free(value->str); return 1; case TOK_TYPE: parser->state = STATE_TYPE; return 1; case 0: return 0; } break; case STATE_RULE_BAR: if (token == '|') { parser->state = STATE_RULE_EQUAL; return 1; } break; case STATE_RULE_EQUAL: if (token == '=') { parser->state = STATE_RULE; return 1; } break; case STATE_RULE: switch (token) { case TOK_SYMBOL_LC: state->add_rule_nonterminal(value->str); free(value->str); return 1; case TOK_SYMBOL_UC: state->add_rule_terminal(value->str); free(value->str); return 1; case TOK_CHAR: state->add_rule_terminal(value->number); return 1; case TOK_BLOCK: state->add_rule(value->str); free(value->str); parser->state = STATE_INIT; return 1; case '(': parser->state = STATE_RULE_VAR_PRE; return 1; case ';': state->add_rule(); parser->state = STATE_INIT; return 1; } break; case STATE_RULE_VAR_PRE: switch (token) { case TOK_SYMBOL: case TOK_SYMBOL_UC: case TOK_SYMBOL_LC: state->add_rule_var(value->str); free(value->str); parser->state = STATE_RULE_VAR; return 1; } break; case STATE_RULE_VAR: if (token == ')') { parser->state = STATE_RULE; return 1; } break; case STATE_RULE_VAR_POST: switch (token) { case TOK_SYMBOL_LC: state->add_rule_nonterminal(value->str); free(value->str); return 1; case TOK_SYMBOL_UC: state->add_rule_terminal(value->str); free(value->str); return 1; case TOK_CHAR: state->add_rule_terminal(value->number); return 1; case TOK_BLOCK: state->add_rule(value->str); free(value->str); parser->state = STATE_INIT; return 1; case ';': state->add_rule(); parser->state = STATE_INIT; return 1; } break; case STATE_TYPE: switch (token) { case TOK_SYMBOL_LC: state->add_type_nonterminal(value->str); free(value->str); parser->state = STATE_TYPE_NONTERM; return 1; case TOK_SYMBOL_UC: state->add_type_terminal(value->str); free(value->str); parser->state = STATE_TYPE_TERM; return 1; } break; case STATE_TYPE_NONTERM: if (token == TOK_BLOCK) { state->set_type_nonterminal(value->str); free(value->str); parser->state = STATE_INIT; return 1; } break; case STATE_TYPE_TERM: if (token == TOK_BLOCK) { state->set_type_terminal(value->str); free(value->str); parser->state = STATE_TYPE_TERM_BLOCK; return 1; } break; case STATE_TYPE_TERM_BLOCK: switch (token) { case TOK_SYMBOL: case TOK_SYMBOL_UC: case TOK_SYMBOL_LC: state->set_type_terminal_name(value->str); free(value->str); parser->state = STATE_INIT; return 1; } } switch (token) { case TOK_SYMBOL: case TOK_SYMBOL_UC: case TOK_SYMBOL_LC: case TOK_CHAR: case TOK_BLOCK: free(value->str);; } return -1; } void parser_free(parser_t *parser) { std::free(parser); } }