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Copy pathparser.cpp
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131 lines (114 loc) · 3.43 KB
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#include "parser.h"
#include "token_conventor.h"
#include "ast_tree_viewer.h"
namespace simple_parser {
void Parser::advance(const char *expect) {
simple_lexser::Token_t t = lexser.get_token_by_index(current_lex_index);
if (t.value == std::string(expect))
advance();
else {
printf("expect %s, got %s at line %d token index %d\n",
expect, t.value.c_str(), t.line, t.index);
exit(-1);
}
}
void Parser::advance(void) {
++current_lex_index;
}
std::string Parser::peek_current_value() {
return lexser.get_token_by_index(current_lex_index).value;
}
simple_lexser::token_type Parser::peek_current_type() {
return lexser.get_token_by_index(current_lex_index).type;
}
AstToken *Parser::get_current_token() {
return TokenConventor::convert(lexser.get_token_by_index(current_lex_index), *this);
}
AstToken *Parser::expression(int bp) {
AstToken *token = get_current_token();
advance();
AstToken *left = token->nud();
AstToken *current_token;
for (current_token = get_current_token();
bp < dynamic_cast<InfixAstToken *>(current_token) ->bp;) {
token = current_token;
advance();
left = token->led(left);
current_token = get_current_token();
}
delete(current_token);
return left;
}
AstToken *Parser::statement() {
AstToken *token = get_current_token();
if ((void *)&AstToken::std != (void *)(token->*(&AstToken::std))) {
advance();
return token->std();
} else {
delete(token); // because we will allocate another one in expression()
token = expression(0);
advance(";");
return token;
}
}
AstToken *Parser::statements() {
struct simple_parser::TokenMessager messager;
messager.type = STATEMENTS;
AstToken *statements_token = new AstToken(messager, *this);
while (true) {
if (peek_current_value() == "}" || peek_current_type() == simple_lexser::END) {
break;
}
AstToken *s = statement();
statements_token->child_list.push_back(s);
}
return statements_token;
}
AstToken *Parser::block() {
AstToken *token = get_current_token();
advance("{");
return token->std();
}
AstToken *Parser::function() {
AstToken *token = get_current_token();
assert(token->peek_type() == IDENTIFIER);
token->set_type(FUNCTION);
advance();
advance("(");
while(peek_current_value() != ")") {
AstToken *variable = get_current_token();
assert(variable->peek_type() == IDENTIFIER);
token->child_list.push_back(variable);
advance();
if (peek_current_value() == ",")
advance(",");
}
advance(")");
token->child_list.push_back(block());
return token;
}
AstToken *Parser::variable() {
AstToken *token = get_current_token();
assert(token->peek_type() == IDENTIFIER);
}
void Parser::parse() {
this->ast_tree_root = statements();
simple_parser::AstTreeViewer(this->ast_tree_root).view();
}
void Parser::parse_expression() {
this->ast_tree_root = expression(0);
simple_parser::AstTreeViewer(this->ast_tree_root).view();
}
Parser::~Parser() {
delete_tree(ast_tree_root);
}
void Parser::delete_tree(AstToken* root) {
for (vector<AstToken *>::iterator it = root->child_list.begin();
it != root->child_list.end();) {
delete_tree(*it);
it = root->child_list.erase(it);
}
delete(root);
root = nullptr;
}
}