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feat: 复合赋值 += -= *= /= + CHANGELOG 更新

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- lexer: 4 个复合赋值 Token (解析时优先于单字符)
- parser: desugar x+=expr → x=x+expr（零 sema/codegen 改动）
- 新增集成测试 09_compound_assign.l (15 12 24 6)
- CHANGELOG 新增 v0.2.0 条目
This commit is contained in:
刘航宇
2026-06-05 02:40:05 +08:00
parent 9e41b09318
commit d5a94d45cb
6 changed files with 71 additions and 2 deletions
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src/lexer/lexer.c
+6 -2
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@@ -104,10 +104,14 @@ Token* lex(Arena* a, const char* source, const char* filename,
tokens[idx++] = make_token(&l, TOK_STR_LIT, start, len);
}
else if (isalpha(c) || c == '_') { tokens[idx++] = lex_ident_or_keyword(&l); }
else if (c == '+' && peek_next(&l) != '=') { tokens[idx++] = make_token(&l, TOK_PLUS, l.pos, 1); advance(&l); }
else if (c == '-' && peek_next(&l) != '>') { tokens[idx++] = make_token(&l, TOK_MINUS, l.pos, 1); advance(&l); }
else if (c == '+' && peek_next(&l) == '=') { tokens[idx++] = make_token(&l, TOK_PLUS_EQ, l.pos, 2); advance(&l); advance(&l); }
else if (c == '+') { tokens[idx++] = make_token(&l, TOK_PLUS, l.pos, 1); advance(&l); }
else if (c == '-' && peek_next(&l) == '=') { tokens[idx++] = make_token(&l, TOK_MINUS_EQ, l.pos, 2); advance(&l); advance(&l); }
else if (c == '-' && peek_next(&l) == '>') { tokens[idx++] = make_token(&l, TOK_ARROW, l.pos, 2); advance(&l); advance(&l); }
else if (c == '-') { tokens[idx++] = make_token(&l, TOK_MINUS, l.pos, 1); advance(&l); }
else if (c == '*' && peek_next(&l) == '=') { tokens[idx++] = make_token(&l, TOK_STAR_EQ, l.pos, 2); advance(&l); advance(&l); }
else if (c == '*') { tokens[idx++] = make_token(&l, TOK_STAR, l.pos, 1); advance(&l); }
else if (c == '/' && peek_next(&l) == '=') { tokens[idx++] = make_token(&l, TOK_SLASH_EQ, l.pos, 2); advance(&l); advance(&l); }
else if (c == '/') { tokens[idx++] = make_token(&l, TOK_SLASH, l.pos, 1); advance(&l); }
else if (c == '%') { tokens[idx++] = make_token(&l, TOK_PERCENT, l.pos, 1); advance(&l); }
else if (c == '=' && peek_next(&l) == '=') { tokens[idx++] = make_token(&l, TOK_EQ_EQ, l.pos, 2); advance(&l); advance(&l); }