snapshot before regression test

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t
2026-07-18 19:25:40 +08:00
commit 796222a300
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includes/ast/lexer.py Normal file
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import t, c
from stdint import *
import memhub
import string
from .tokens import (
Token, TokenType, TokOp, _init_tables, _kw_lookup, _op_head,
OpEntry, new_token, token_set_str, token_set_str_literal,
)
# 缩进栈最大深度
LEXER_MAX_INDENT: t.CDefine = 256
# ============================================================
# Lexer 状态结构体
# ============================================================
class Lexer:
src: str # 源代码NUL 结尾)
pos: t.CSizeT # 当前位置
len: t.CSizeT # 源代码长度
lineno: t.CInt # 当前行号(从 1 开始)
col: t.CInt # 当前列号(从 0 开始)
pool: memhub.MemManager | t.CPtr # 内存池
indent_stack: t.CInt | t.CPtr # 缩进栈int 数组,从 pool 分配)
indent_top: t.CInt # 栈顶索引(-1 表示空栈)
paren_depth: t.CInt # 括号深度(>0 时不产生 TokenType.NewLine
tokens_head: Token | t.CPtr # token 链表头
tokens_tail: Token | t.CPtr # token 链表尾
at_line_start: t.CInt # 1=行首(需处理缩进)
error_count: t.CInt # 错误计数
def __new__(self, pool: memhub.MemManager | t.CPtr):
ptr: Lexer | t.CPtr = pool.alloc(Lexer.__sizeof__())
if ptr:
string.memset(ptr, 0, Lexer.__sizeof__())
return ptr
def new_lexer(pool: memhub.MemManager | t.CPtr) -> Lexer | t.CPtr:
"""从 pool 分配并返回 Lexer跨模块安全包装"""
return Lexer(pool)
def _lexer_init(lx: Lexer | t.CPtr, src: str,
pool: memhub.MemManager | t.CPtr):
"""初始化 Lexer"""
if lx == None: return
lx.src = src
lx.pos = 0
lx.len = string.strlen(src) if src != None else 0
lx.lineno = 1
lx.col = 0
lx.pool = pool
# 分配缩进栈
lx.indent_stack = pool.alloc(LEXER_MAX_INDENT * 8)
if lx.indent_stack != None:
string.memset(lx.indent_stack, 0, LEXER_MAX_INDENT * 8)
lx.indent_top = -1
# 栈底压入 0基础缩进
if lx.indent_stack != None:
lx.indent_stack[0] = 0
lx.indent_top = 0
lx.paren_depth = 0
lx.tokens_head = None
lx.tokens_tail = None
lx.at_line_start = 1
lx.error_count = 0
_init_tables(pool)
# ============================================================
# 辅助函数
# ============================================================
def _peek(lx: Lexer | t.CPtr, offset: t.CSizeT) -> t.CChar:
"""查看 pos+offset 处字符,越界返回 '\0'"""
p: t.CSizeT = lx.pos + offset
if p >= lx.len:
return '\0'
return lx.src[p]
def _peek_cur(lx: Lexer | t.CPtr) -> t.CChar:
if lx.pos >= lx.len:
return '\0'
return lx.src[lx.pos]
def _advance(lx: Lexer | t.CPtr) -> t.CChar:
"""前进一个字符,返回该字符"""
if lx.pos >= lx.len:
return '\0'
ch: t.CChar = lx.src[lx.pos]
lx.pos += 1
if ch == '\n':
lx.lineno += 1
lx.col = 0
else:
lx.col += 1
return ch
def _is_alpha(ch: t.CChar) -> t.CInt:
if ch >= 'a' and ch <= 'z': return 1
if ch >= 'A' and ch <= 'Z': return 1
if ch == '_': return 1
return 0
def _is_digit(ch: t.CChar) -> t.CInt:
if ch >= '0' and ch <= '9': return 1
return 0
def _is_alnum(ch: t.CChar) -> t.CInt:
if _is_alpha(ch): return 1
if _is_digit(ch): return 1
return 0
def _is_hex(ch: t.CChar) -> t.CInt:
if ch >= '0' and ch <= '9': return 1
if ch >= 'a' and ch <= 'f': return 1
if ch >= 'A' and ch <= 'F': return 1
return 0
def _is_space(ch: t.CChar) -> t.CInt:
if ch == ' ': return 1
if ch == '\t': return 1
if ch == '\f': return 1
if ch == '\v': return 1
if ch == '\r': return 1
return 0
def _emit(lx: Lexer | t.CPtr, tok: Token | t.CPtr):
"""将 token 追加到链表"""
if tok == None: return
if lx.tokens_head == None:
lx.tokens_head = tok
lx.tokens_tail = tok
else:
lx.tokens_tail.next = tok
lx.tokens_tail = tok
def _make_op_token(lx: Lexer | t.CPtr, op_id: t.CInt, length: t.CInt,
lineno: t.CInt, col: t.CInt) -> Token | t.CPtr:
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Op, lineno, col)
if tok == None: return None
tok.op_subtype = op_id
tok.end_col_offset = col + length
return tok
# ============================================================
# 缩进处理
# ============================================================
def _handle_indent(lx: Lexer | t.CPtr):
"""处理行首缩进,生成 TokenType.Indent/TokenType.Dedent。
跳过空行和注释行(不产生缩进变化)。"""
# 先跳过空行和注释行
while lx.pos < lx.len:
# 记住行首位置,用于非空行回退
line_start_pos: t.CSizeT = lx.pos
line_start_col: t.CInt = lx.col
# 跳过空白(不跨行)
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch == ' ' or ch == '\t' or ch == '\f' or ch == '\v':
lx.pos += 1
lx.col += 1
elif ch == '\r':
# CRLF 行尾符的 \r跳过让 \n 触发空行处理)
lx.pos += 1
else:
break
if lx.pos >= lx.len:
break
ch = lx.src[lx.pos]
if ch == '\n':
# 空行,跳过
lx.pos += 1
lx.lineno += 1
lx.col = 0
continue
if ch == '\r':
# CRLF 空行(\r 后跟 \n跳过 \r
lx.pos += 1
if lx.pos < lx.len and lx.src[lx.pos] == '\n':
lx.pos += 1
lx.lineno += 1
lx.col = 0
continue
if ch == '#':
# 注释行,跳过到行尾
while lx.pos < lx.len and lx.src[lx.pos] != '\n':
lx.pos += 1
continue
# 非空行:回退到行首,让后续缩进计算能读到前导空格
lx.pos = line_start_pos
lx.col = line_start_col
break
if lx.pos >= lx.len:
# 文件末尾,不再处理缩进
lx.at_line_start = 0
return
# 计算当前行缩进
indent: t.CInt = 0
save_pos: t.CSizeT = lx.pos
save_col: t.CInt = lx.col
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch == ' ':
indent += 1
lx.pos += 1
lx.col += 1
elif ch == '\t':
indent += 8 - (indent % 8)
lx.pos += 1
lx.col += 1
else:
break
# 如果行尾(空行),不处理
if lx.pos < lx.len:
ch = lx.src[lx.pos]
if ch == '\n' or ch == '\r' or ch == '#':
# 空行或注释行,回退位置让主循环处理
lx.pos = save_pos
lx.col = save_col
lx.at_line_start = 0
return
# 与缩进栈比较
top_indent: t.CInt = lx.indent_stack[lx.indent_top]
if indent > top_indent:
# TokenType.Indent
if lx.indent_top + 1 >= LEXER_MAX_INDENT:
lx.error_count += 1
return
lx.indent_top += 1
lx.indent_stack[lx.indent_top] = indent
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Indent, lx.lineno, 0)
_emit(lx, tok)
else:
while indent < lx.indent_stack[lx.indent_top] and lx.indent_top > 0:
lx.indent_top -= 1
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Dedent, lx.lineno, 0)
_emit(lx, tok)
lx.at_line_start = 0
# ============================================================
# 标识符/关键字
# ============================================================
def _read_name(lx: Lexer | t.CPtr):
start: t.CSizeT = lx.pos
start_lineno: t.CInt = lx.lineno
start_col: t.CInt = lx.col
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if _is_alnum(ch):
lx.pos += 1
lx.col += 1
else:
break
length: t.CSizeT = lx.pos - start
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Name, start_lineno, start_col)
if tok == None: return
token_set_str(lx.pool, tok, lx.src, start, length)
tok.end_lineno = lx.lineno
tok.end_col_offset = start_col + t.CInt(length)
# 查找关键字
kw_id: t.CInt = _kw_lookup(tok.str_val)
if kw_id:
tok.kw_subtype = kw_id
_emit(lx, tok)
# ============================================================
# 数字
# ============================================================
def _read_number(lx: Lexer | t.CPtr):
start: t.CSizeT = lx.pos
start_lineno: t.CInt = lx.lineno
start_col: t.CInt = lx.col
is_float: t.CInt = 0
is_complex: t.CInt = 0
ch0: t.CChar = lx.src[lx.pos]
# 处理 0x/0o/0b 前缀
if ch0 == '0' and lx.pos + 1 < lx.len:
ch1: t.CChar = lx.src[lx.pos + 1]
if ch1 == 'x' or ch1 == 'X':
lx.pos += 2
lx.col += 2
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if _is_hex(ch) or ch == '_':
lx.pos += 1
lx.col += 1
else:
break
_emit_number(lx, start, start_lineno, start_col, 0, 0, 0)
return
if ch1 == 'o' or ch1 == 'O':
lx.pos += 2
lx.col += 2
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch >= '0' and ch <= '7':
lx.pos += 1
lx.col += 1
elif ch == '_':
lx.pos += 1
lx.col += 1
else:
break
_emit_number(lx, start, start_lineno, start_col, 0, 0, 0)
return
if ch1 == 'b' or ch1 == 'B':
lx.pos += 2
lx.col += 2
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch == '0' or ch == '1' or ch == '_':
lx.pos += 1
lx.col += 1
else:
break
_emit_number(lx, start, start_lineno, start_col, 0, 0, 0)
return
# 十进制整数/浮点
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if _is_digit(ch) or ch == '_':
lx.pos += 1
lx.col += 1
else:
break
# 小数部分
if lx.pos < lx.len and lx.src[lx.pos] == '.':
is_float = 1
lx.pos += 1
lx.col += 1
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if _is_digit(ch) or ch == '_':
lx.pos += 1
lx.col += 1
else:
break
# 指数部分
if lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch == 'e' or ch == 'E':
is_float = 1
lx.pos += 1
lx.col += 1
if lx.pos < lx.len:
ch = lx.src[lx.pos]
if ch == '+' or ch == '-':
lx.pos += 1
lx.col += 1
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if _is_digit(ch) or ch == '_':
lx.pos += 1
lx.col += 1
else:
break
# 虚数后缀
if lx.pos < lx.len and lx.src[lx.pos] == 'j':
is_complex = 1
is_float = 1
lx.pos += 1
lx.col += 1
_emit_number(lx, start, start_lineno, start_col, is_float, is_complex, 0)
def _emit_number(lx: Lexer | t.CPtr, start: t.CSizeT,
start_lineno: t.CInt, start_col: t.CInt,
is_float: t.CInt, is_complex: t.CInt, is_hex: t.CInt):
length: t.CSizeT = lx.pos - start
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Number, start_lineno, start_col)
if tok == None: return
token_set_str(lx.pool, tok, lx.src, start, length)
tok.is_float = is_float
tok.is_complex = is_complex
tok.end_lineno = lx.lineno
tok.end_col_offset = start_col + t.CInt(length)
# 解析数值
if is_float:
tok.float_val = string.atof(tok.str_val)
else:
tok.int_val = string.atoll(tok.str_val)
_emit(lx, tok)
# ============================================================
# 字符串
# ============================================================
def _read_string(lx: Lexer | t.CPtr):
"""读取字符串字面量。
支持前缀: r, b, u, f, rb, br, rf, fr大小写不敏感
支持引号: ', ", ''', """
start_lineno: t.CInt = lx.lineno
start_col: t.CInt = lx.col
prefix_start: t.CSizeT = lx.pos
# 读取前缀r/b/u/f
is_raw: t.CInt = 0
is_bytes: t.CInt = 0
is_fstring: t.CInt = 0
while lx.pos < lx.len:
ch: t.CChar = lx.src[lx.pos]
if ch == 'r' or ch == 'R':
is_raw = 1
lx.pos += 1
lx.col += 1
elif ch == 'b' or ch == 'B':
is_bytes = 1
lx.pos += 1
lx.col += 1
elif ch == 'u' or ch == 'U':
lx.pos += 1
lx.col += 1
elif ch == 'f' or ch == 'F':
is_fstring = 1
lx.pos += 1
lx.col += 1
else:
break
if lx.pos >= lx.len:
lx.error_count += 1
return
# 确定引号
quote: t.CChar = lx.src[lx.pos]
if quote != '\'' and quote != '"':
lx.error_count += 1
return
# 检查三引号
is_triple: t.CInt = 0
if lx.pos + 2 < lx.len:
if lx.src[lx.pos] == quote and lx.src[lx.pos + 1] == quote and lx.src[lx.pos + 2] == quote:
is_triple = 1
content_start: t.CSizeT = lx.pos
if is_triple:
lx.pos += 3
lx.col += 3
else:
lx.pos += 1
lx.col += 1
# 读取字符串内容
content_buf_start: t.CSizeT = lx.pos
while lx.pos < lx.len:
ch = lx.src[lx.pos]
if is_triple:
if ch == quote:
if lx.pos + 2 < lx.len:
if lx.src[lx.pos + 1] == quote and lx.src[lx.pos + 2] == quote:
break
elif lx.pos + 2 == lx.len:
break
if ch == '\\':
lx.pos += 1
lx.col += 1
if lx.pos < lx.len:
if lx.src[lx.pos] == '\n':
lx.lineno += 1
lx.col = 0
lx.pos += 1
lx.col += 1
continue
if ch == '\n':
lx.lineno += 1
lx.col = 0
lx.pos += 1
lx.col += 1
else:
if ch == quote:
break
if ch == '\n':
# 单引号字符串不能跨行(除非续行)
lx.error_count += 1
return
if ch == '\\' and not is_raw:
lx.pos += 1
lx.col += 1
if lx.pos < lx.len:
lx.pos += 1
lx.col += 1
continue
lx.pos += 1
lx.col += 1
content_end: t.CSizeT = lx.pos
# 跳过结束引号
if is_triple:
if lx.pos + 2 < lx.len:
lx.pos += 3
lx.col += 3
else:
lx.pos = lx.len
else:
if lx.pos < lx.len:
lx.pos += 1
lx.col += 1
# 创建 token
tok: Token | t.CPtr = new_token(lx.pool, TokenType.String, start_lineno, start_col)
if tok == None: return
content_len: t.CSizeT = content_end - content_buf_start
# 处理转义序列(非 raw 字符串)
if is_raw == 0 and content_len > 0:
# 分配转换缓冲区(最大情况:每个字符都是普通字符,无需扩展)
conv_buf: str = lx.pool.alloc(content_len + 1)
if conv_buf == None:
token_set_str(lx.pool, tok, lx.src, content_buf_start, content_len)
else:
wpos: t.CSizeT = 0
rpos: t.CSizeT = 0
while rpos < content_len:
ch: t.CChar = lx.src[content_buf_start + rpos]
if ch == '\\' and rpos + 1 < content_len:
rpos += 1
next_ch: t.CChar = lx.src[content_buf_start + rpos]
if next_ch == 'n':
conv_buf[wpos] = '\n'
elif next_ch == 't':
conv_buf[wpos] = '\t'
elif next_ch == 'r':
conv_buf[wpos] = '\r'
elif next_ch == '\\':
conv_buf[wpos] = '\\'
elif next_ch == '\'':
conv_buf[wpos] = '\''
elif next_ch == '"':
conv_buf[wpos] = '"'
elif next_ch == '0':
conv_buf[wpos] = '\0'
else:
# 未知转义,保留原样(包括 \xNN 等以后再处理)
conv_buf[wpos] = '\\'
wpos += 1
conv_buf[wpos] = next_ch
wpos += 1
rpos += 1
else:
conv_buf[wpos] = ch
wpos += 1
rpos += 1
conv_buf[wpos] = '\0'
token_set_str_literal(lx.pool, tok, conv_buf)
else:
token_set_str(lx.pool, tok, lx.src, content_buf_start, content_len)
tok.end_lineno = lx.lineno
tok.end_col_offset = lx.col
# flags 字段复用bit0=raw, bit1=bytes, bit2=fstring, bit3=triple
if is_raw: tok.kw_subtype = tok.kw_subtype | 1
if is_bytes: tok.kw_subtype = tok.kw_subtype | 2
if is_fstring: tok.kw_subtype = tok.kw_subtype | 4
if is_triple: tok.kw_subtype = tok.kw_subtype | 8
_emit(lx, tok)
# ============================================================
# 运算符
# ============================================================
def _read_operator(lx: Lexer | t.CPtr):
"""贪婪匹配运算符"""
start_lineno: t.CInt = lx.lineno
start_col: t.CInt = lx.col
remaining: t.CSizeT = lx.len - lx.pos
# 遍历运算符表,找最长匹配
best_entry: OpEntry | t.CPtr = None
best_len: t.CInt = 0
cur: OpEntry | t.CPtr = _op_head
while cur != None:
if cur.length <= t.CInt(remaining):
# 比较 cur.name 与 src[pos:pos+cur.length]
match: t.CInt = 1
i: t.CSizeT = 0
while i < t.CSizeT(cur.length):
if lx.src[lx.pos + i] != cur.name[i]:
match = 0
break
i += 1
if match:
if cur.length > best_len:
best_len = cur.length
best_entry = cur
cur = cur.next
if best_entry == None:
# 未知字符,报错并跳过
lx.error_count += 1
lx.pos += 1
lx.col += 1
return
# 更新括号深度
if best_entry.op_id == TokOp.LPar or best_entry.op_id == TokOp.Lsqb or best_entry.op_id == TokOp.LBrace:
lx.paren_depth += 1
elif best_entry.op_id == TokOp.RPar or best_entry.op_id == TokOp.Rsqb or best_entry.op_id == TokOp.RBrace:
if lx.paren_depth > 0:
lx.paren_depth -= 1
tok: Token | t.CPtr = _make_op_token(lx, best_entry.op_id, best_entry.length,
start_lineno, start_col)
if tok == None: return
token_set_str(lx.pool, tok, lx.src, lx.pos, t.CSizeT(best_len))
lx.pos += t.CSizeT(best_len)
lx.col += best_len
_emit(lx, tok)
# ============================================================
# 主词法分析入口
# ============================================================
def tokenize(lx: Lexer | t.CPtr) -> Token | t.CPtr:
"""执行词法分析,返回 token 链表头"""
if lx == None: return None
while lx.pos < lx.len:
# 行首缩进处理
if lx.at_line_start and lx.paren_depth == 0:
_handle_indent(lx)
if lx.pos >= lx.len:
break
ch: t.CChar = _peek_cur(lx)
if ch == '\0':
break
# 换行
if ch == '\n':
if lx.paren_depth > 0:
# 括号内,产生 TokenType.Nl
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Nl, lx.lineno, lx.col)
_emit(lx, tok)
else:
# 逻辑换行
tok: Token | t.CPtr = new_token(lx.pool, TokenType.NewLine, lx.lineno, lx.col)
_emit(lx, tok)
lx.at_line_start = 1
lx.pos += 1
lx.lineno += 1
lx.col = 0
continue
# 反斜线续行
if ch == '\\' and lx.pos + 1 < lx.len and lx.src[lx.pos + 1] == '\n':
lx.pos += 2
lx.lineno += 1
lx.col = 0
continue
# 空白
if _is_space(ch):
lx.pos += 1
lx.col += 1
continue
# 注释
if ch == '#':
while lx.pos < lx.len and lx.src[lx.pos] != '\n':
lx.pos += 1
continue
# 字符串前缀(如 r"...")或字符串
if ch == '\'' or ch == '"':
_read_string(lx)
continue
# 字符串前缀字母后跟引号(必须在 _is_alpha 之前检测,否则 f/r/b/u 会被当作 TokenType.Name
if (ch == 'r' or ch == 'R' or ch == 'b' or ch == 'B' or
ch == 'u' or ch == 'U' or ch == 'f' or ch == 'F'):
if lx.pos + 1 < lx.len:
ch1: t.CChar = lx.src[lx.pos + 1]
if ch1 == '\'' or ch1 == '"':
_read_string(lx)
continue
# 双前缀如 rb, br, rf, fr
if lx.pos + 2 < lx.len:
ch2: t.CChar = lx.src[lx.pos + 2]
if ((ch1 == 'r' or ch1 == 'R' or ch1 == 'b' or ch1 == 'B' or
ch1 == 'f' or ch1 == 'F' or ch1 == 'u' or ch1 == 'U') and
(ch2 == '\'' or ch2 == '"')):
_read_string(lx)
continue
# 标识符/关键字
if _is_alpha(ch):
_read_name(lx)
continue
# 数字
if _is_digit(ch):
_read_number(lx)
continue
# 运算符
_read_operator(lx)
# 文件结尾:产生 TokenType.NewLine如果有内容
if lx.tokens_tail != None:
if lx.tokens_tail.type != TokenType.NewLine and lx.tokens_tail.type != TokenType.Nl:
tok: Token | t.CPtr = new_token(lx.pool, TokenType.NewLine, lx.lineno, lx.col)
_emit(lx, tok)
# 产生剩余 TokenType.Dedent
while lx.indent_top > 0:
lx.indent_top -= 1
tok: Token | t.CPtr = new_token(lx.pool, TokenType.Dedent, lx.lineno, 0)
_emit(lx, tok)
# TokenType.EndMarker
tok: Token | t.CPtr = new_token(lx.pool, TokenType.EndMarker, lx.lineno, 0)
_emit(lx, tok)
return lx.tokens_head