大致实现了词法分析器

This commit is contained in:
Gary Gan 2025-06-04 20:48:10 +08:00
parent 25236a4901
commit 0a3bfc4a08
3 changed files with 243 additions and 113 deletions

View File

@ -12,6 +12,24 @@ public:
Scanner(module_t& module)
: module(module) {}
inline std::vector<token_t> scan() {
std::vector<token_t> tokens;
while (!at_eof()) {
if (skip_space()) {
// 如果是空格或换行,则跳过
continue;
}
token_t token = item();
tokens.push_back(token);
}
tokens.push_back(token_t(TOKEN_EOF, "EOF", module.s_cursor.line, module.s_cursor.column));
return tokens;
}
private:
module_t& module;
@ -90,7 +108,7 @@ private:
}
inline bool at_eof() {
return module.s_cursor.guard == '\0';
return module.s_cursor.source[module.s_cursor.guard] == '\0';
}
inline char guard_advance() {
@ -127,7 +145,7 @@ private:
return gen_word();
}
inline token_type_t scanner_special_char(module_t *m) {
inline token_type_t special_char() {
char c = guard_advance();
switch (c) {
case '(':
@ -210,6 +228,7 @@ private:
default:
return token_type_t::TOKEN_NOT_IN_THIS_TYPE;
}
}
inline std::string string_advance() {
@ -293,6 +312,21 @@ private:
}
}
inline double number_convert_float(std::string word) {
try {
double decimal = std::stod(word);
return decimal;
} catch (const std::invalid_argument& e) {
std::cerr << "[ERROR] line: " << module.s_cursor.line << ". column: "
<< module.s_cursor.column <<". Invalid number: " << word << std::endl;
return 0;
} catch (const std::out_of_range& e) {
std::cerr << "[ERROR] line: " << module.s_cursor.line << ". column: "
<< module.s_cursor.column <<". Number out of range: " << word << std::endl;
return 0;
}
}
inline std::string hex_number_advance() {
module.s_cursor.guard += 2; // 跳过 0x
@ -300,7 +334,7 @@ private:
guard_advance();
}
return gen_word();
return module.s_cursor.source.substr(module.s_cursor.current+2, module.s_cursor.length);
}
inline std::string oct_number_advance() {
@ -310,7 +344,7 @@ private:
guard_advance();
}
return gen_word();
return module.s_cursor.source.substr(module.s_cursor.current+2, module.s_cursor.length);
}
inline std::string bin_number_advance() {
@ -320,7 +354,7 @@ private:
guard_advance();
}
return gen_word();
return module.s_cursor.source.substr(module.s_cursor.current+2, module.s_cursor.length);
}
inline std::string number_advance() {
@ -358,118 +392,103 @@ private:
case 'a': {
switch (word[1]) {
case 'r': {
if (word.substr(2, 3) == "ray") {
if (word.substr(2, 3) == "ray" && word.size() == 5) {
return TOKEN_ARR;
}
}
}
break;
}
case 'b':
case 'b': {
switch (word[1]) {
case 'o':
if (word.substr(2, 2) == "ol") {
if (word.substr(2, 2) == "ol" && word.size() == 4) {
return TOKEN_BOOL;
}
case 'r':
if (word.substr(2, 3) == "eak") {
if (word.substr(2, 3) == "eak" && word.size() == 5) {
return TOKEN_BREAK;
}
}
break;
case 'c':
}
case 'c': {
switch (word[1]) {
case 'o':
if (word.substr(2, 6) == "ntinue") {
if (word.substr(2, 6) == "ntinue" && word.size() == 8) {
return TOKEN_CONTINUE;
}
}
break;
case 'e':
if (word.substr(1, 3) == "lse") {
if (length == 3 && word[3] == 'i') {
return TOKEN_ELSE_IF;
}
}
case 'e': {
if (word.substr(1, 3) == "lse" && word.size() == 4) {
return TOKEN_ELSE;
}
return scanner_rest(word, length, 1, 3, "lse", TOKEN_ELSE);
}
case 'f': {
switch (word[1]) {
case 'n':
return scanner_rest(word, length, 2, 0, "", TOKEN_FN);
if (word.size() == 2) {
return TOKEN_FN;
}
case 'a':
return scanner_rest(word, length, 2, 3, "lse", TOKEN_FALSE);
case 'l':
return scanner_rest(word, length, 2, 3, "oat", TOKEN_FLOAT);
if (word.substr(2, 3) == "lse" && word.size() == 5) {
return TOKEN_FALSE;
}
case '3':
return scanner_rest(word, length, 2, 1, "2", TOKEN_F32);
if (word.substr(2, 1) == "2" && word.size() == 3) {
return TOKEN_F32;
}
case '6':
return scanner_rest(word, length, 2, 1, "4", TOKEN_F64);
if (word.substr(2, 1) == "4" && word.size() == 3) {
return TOKEN_F64;
}
case 'o':
return scanner_rest(word, length, 2, 1, "r", TOKEN_FOR);
if (word.substr(2, 1) == "r" && word.size() == 3) {
return TOKEN_FOR;
}
}
break;
}
case 'g':
return scanner_rest(word, length, 1, 1, "o", TOKEN_GO);
case 'i': {
if (length == 2 && word[1] == 'n') {
return TOKEN_IN;
} else if (length == 2 && word[1] == 's') {
return TOKEN_IS;
} else if (length == 3 && word[1] == 'n' && word[2] == 't') {
return TOKEN_INT;
}
switch (word[1]) {
case 'm':
return scanner_rest(word, length, 2, 4, "port", TOKEN_IMPORT);
case 'f':
return scanner_rest(word, length, 2, 0, "", TOKEN_IF);
case 'n':
return scanner_rest(word, length, 2, 7, "terface", TOKEN_INTERFACE);
if (word.size() == 2) {
return TOKEN_IF;
}
case '8':
return scanner_rest(word, length, 2, 0, "", TOKEN_I8);
if (word.size() == 2) {
return TOKEN_I8;
}
case '1':
return scanner_rest(word, length, 2, 1, "6", TOKEN_I16);
if (word.substr(2, 1) == "6" && word.size() == 3) {
return TOKEN_I16;
}
case '3':
return scanner_rest(word, length, 2, 1, "2", TOKEN_I32);
if (word.substr(2, 1) == "2" && word.size() == 3) {
return TOKEN_I32;
}
case '6':
return scanner_rest(word, length, 2, 1, "4", TOKEN_I64);
if (word.substr(2, 1) == "4" && word.size() == 3) {
return TOKEN_I64;
}
}
break;
}
case 'l': {
return scanner_rest(word, length, 1, 2, "et", TOKEN_LET);
}
case 'n':
switch (word[1]) {
case 'u': // null
return scanner_rest(word, length, 2, 2, "ll", TOKEN_NULL);
// case 'e':// new, new 识别成 ident 在 parser 采用固定语法结构时才会被识别成 new
// return scanner_rest(word, length, 2, 1, "w", TOKEN_NEW);
}
break;
case 'p':
return scanner_rest(word, length, 1, 2, "tr", TOKEN_PTR);
case 's': {
// self,string,struct,sizeof,sett
switch (word[1]) {
case 'e': {
switch (word[2]) {
case 't':
return scanner_rest(word, length, 3, 0, "", TOKEN_SET);
case 'l': // select
return scanner_rest(word, length, 3, 3, "ect", TOKEN_SELECT);
}
}
}
if (length == 6 && word[1] == 't' && word[2] == 'r') {
switch (word[3]) {
case 'i':
return scanner_rest(word, length, 4, 2, "ng", TOKEN_STRING);
if (word.substr(4, 2) == "ng" && word.size() == 6) {
return TOKEN_STRING;
}
case 'u':
return scanner_rest(word, length, 4, 2, "ct", TOKEN_STRUCT);
if (word.substr(4, 2) == "ct" && word.size() == 6) {
return TOKEN_STRUCT;
}
}
}
break;
@ -477,18 +496,20 @@ private:
case 't': {
// tup/throw/type/true
switch (word[1]) {
case 'h':
return scanner_rest(word, length, 2, 3, "row", TOKEN_THROW);
case 'y': // type
return scanner_rest(word, length, 2, 2, "pe", TOKEN_TYPE);
if (word.substr(2, 2) == "pe" && word.size() == 4) {
return TOKEN_TYPE;
}
case 'u': // tup
return scanner_rest(word, length, 2, 1, "p", TOKEN_TUP);
if (word.substr(2, 1) == "p" && word.size() == 3) {
return TOKEN_TUP;
}
case 'r': {
switch (word[2]) {
case 'y':
return scanner_rest(word, length, 3, 0, "", TOKEN_TRY);
case 'u':
return scanner_rest(word, length, 3, 1, "e", TOKEN_TRUE);
if (word.substr(3, 1) == "e" && word.size() == 4) {
return TOKEN_TRUE;
}
}
break;
}
@ -498,25 +519,33 @@ private:
case 'v': {
switch (word[1]) {
case 'a':
return scanner_rest(word, length, 2, 1, "r", TOKEN_VAR);
if (word.substr(2, 1) == "r" && word.size() == 3) {
return TOKEN_VAR;
}
case 'e': // vec
return scanner_rest(word, length, 2, 1, "c", TOKEN_VEC);
case 'o': // void
return scanner_rest(word, length, 2, 2, "id", TOKEN_VOID);
if (word.substr(2, 1) == "c" && word.size() == 3) {
return TOKEN_VEC;
}
}
}
case 'u': {
switch (word[1]) {
case 'i':
return scanner_rest(word, length, 2, 2, "nt", TOKEN_UINT);
case '8':
return scanner_rest(word, length, 2, 0, "", TOKEN_U8);
if (word.size() == 2) {
return TOKEN_U8;
}
case '1':
return scanner_rest(word, length, 2, 1, "6", TOKEN_U16);
if (word.substr(2, 1) == "6" && word.size() == 3) {
return TOKEN_U16;
}
case '3':
return scanner_rest(word, length, 2, 1, "2", TOKEN_U32);
if (word.substr(2, 1) == "2" && word.size() == 3) {
return TOKEN_U32;
}
case '6':
return scanner_rest(word, length, 2, 1, "4", TOKEN_U64);
if (word.substr(2, 1) == "4" && word.size() == 3) {
return TOKEN_U64;
}
}
break;
}
@ -526,28 +555,136 @@ private:
case 'a': {
switch (word[2]) {
case 'p':
return scanner_rest(word, length, 3, 0, "", TOKEN_MAP);
case 't':
return scanner_rest(word, length, 3, 2, "ch", TOKEN_MATCH);
if (word.size() == 3) {
return TOKEN_MAP;
}
}
}
}
}
case 'r': {
return scanner_rest(word, length, 1, 5, "eturn", TOKEN_RETURN);
if (word.substr(1, 5) == "eturn" && word.size() == 6) {
// return
return TOKEN_RETURN;
}
}
}
return TOKEN_IDENT;
}
inline bool multi_comment_end() {
return module.s_cursor.source[module.s_cursor.guard] == '*' &&
module.s_cursor.source[module.s_cursor.guard + 1] == '/';
}
inline bool skip_space() {
bool has_new = false;
if (module.s_cursor.guard != module.s_cursor.current) {
module.s_cursor.space_prev = module.s_cursor.source[module.s_cursor.guard - 1];
}
while (true) {
char c = module.s_cursor.source[module.s_cursor.guard];
switch (c) {
case ' ':
case '\r':
case '\t': {
guard_advance();
break;
}
case '\n': {
guard_advance();
has_new = true;
break;
}
case '/': {
if (module.s_cursor.source[module.s_cursor.guard + 1] == '/') {
// 单行注释
while (module.s_cursor.source[module.s_cursor.guard] != '\n' && !at_eof()) {
guard_advance();
}
break;
} else if (module.s_cursor.source[module.s_cursor.guard + 1] == '*') {
while (!multi_comment_end()) {
if (at_eof()) {
std::cerr << "[ERROR] line: " << module.s_cursor.line << ". column: "
<< module.s_cursor.column <<". multi comment not end.";
return false;
}
guard_advance();
}
guard_advance(); // 跳过 *
guard_advance(); // 跳过 /
break;
} else {
module.s_cursor.space_next = module.s_cursor.source[module.s_cursor.guard];
return has_new;
}
break;
}
default: {
module.s_cursor.space_next = module.s_cursor.source[module.s_cursor.guard];
return has_new;
}
}
}
}
inline token_t item() {
module.s_cursor.length = 0; // 重置长度
module.s_cursor.guard = module.s_cursor.current; // 重置游标位置
module.s_cursor.current = module.s_cursor.guard; // 重置游标位置
if (is_alpha(module.s_cursor.source[module.s_cursor.guard])) {
std::string word = ident_advance();
return token_t(ident)
return token_t(scanner_ident(word, word.size()),word, module.s_cursor.line, module.s_cursor.column);
}
if (is_number(module.s_cursor.source[module.s_cursor.guard])) {
std::string word;
long decimal = 0;
if (module.s_cursor.source[module.s_cursor.guard] == '0') {
// 可能是十六进制、八进制或二进制
if (module.s_cursor.source[module.s_cursor.guard + 1] == 'x' ||
module.s_cursor.source[module.s_cursor.guard + 1] == 'X') {
word = hex_number_advance();
decimal = number_convert(word, 16);
} else if (module.s_cursor.source[module.s_cursor.guard + 1] == 'o' ||
module.s_cursor.source[module.s_cursor.guard + 1] == 'O') {
word = oct_number_advance();
decimal = number_convert(word, 8);
} else if (module.s_cursor.source[module.s_cursor.guard + 1] == 'b' ||
module.s_cursor.source[module.s_cursor.guard + 1] == 'B') {
word = bin_number_advance();
decimal = number_convert(word, 2);
}
} else {
word = number_advance();
decimal = number_convert(word, 10);
}
token_type_t type;
if (is_float(word)) {
type = TOKEN_LITERAL_FLOAT;
} else {
type = TOKEN_LITERAL_INT;
}
return token_t(type, word, module.s_cursor.line, module.s_cursor.column);
}
if (is_string(module.s_cursor.source[module.s_cursor.guard])) {
std::string word = string_advance();
return token_t(TOKEN_LITERAL_STRING, word, module.s_cursor.line, module.s_cursor.column);
}
token_type_t type = special_char();
return token_t(type, gen_word(), module.s_cursor.line, module.s_cursor.column);
}
};
};

View File

@ -11,6 +11,9 @@ struct scanner_cursor_t {
int line; // 扫描器当前所在的行
int column; // 扫描器当前所在的列
char space_prev; // 记录空行,注释前的上一个字符
char space_next;
};
struct module_t {
@ -27,5 +30,8 @@ struct module_t {
s_cursor.length = 0;
s_cursor.current = 0;
s_cursor.guard = 0;
s_cursor.space_prev = '\0';
s_cursor.space_next = '\0';
}
};

View File

@ -1,30 +1,17 @@
#include "Token.h"
#include "doctest.h"
#include "stdc++.h"
#include "Scanner.h"
#include "Tbs.h"
#include "types.hpp"
#include "syntax/Scanner.h"
#include "syntax/token.h"
#include <vector>
using std::string,std::vector;
TEST_CASE("Scanner test identifier table") {
Tbs tables;
std::string src = "a += b b<<=casd;";
Scanner scan(src, tables);
scan.scan();
TEST_CASE("Scanner test") {
module_t module("{}");
Scanner scanner(module);
for (auto value_src: scan.get_token_list()) {
std::cout << value_src.id << " " << value_src.type << "\n";
}
scanner.scan();
}
// TEST_CASE("Scanner test Punct table") {
// Tbs tables = {};
// std::string src = "+=---<<=>>>===--((([]--<<<>.";
// Scanner scan(src, tables);
// scan.scan();
// std::cout<<"test\n";
// for (auto e : scan.get_token_list()) {
// std::cout<<e.id<<" "<<e.type<<" "<<tables.PunctTable[e.id]<<"\n";
// }
// }