forked from KolibriOS/kolibrios
395 lines
7.1 KiB
PHP
395 lines
7.1 KiB
PHP
macro test_err
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{ local ..not_error
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cmp [error_n], 0
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je ..not_error
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ret
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..not_error:
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}
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macro set_err err
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{
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mov [error_n], err
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ret
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}
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; ---------------------------
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proc parse
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mov [exp_pos], 0
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stdcall skip_spaces
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 0
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je .null_exp
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mov [exp_lvl], 0
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mov [error_n], 0
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stdcall parse_lvl0
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ret
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.null_exp:
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mov eax, 0
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ret
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endp
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; ---------------------------
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proc parse_lvl0 uses ebx ecx
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test_err
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stdcall parse_lvl1
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test_err
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@@:
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 0
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je .end
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cmp [ebx], byte ")"
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je .brk_end
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inc [exp_pos]
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cmp [ebx], byte "+"
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jne .not_add
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mov ecx, eax
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stdcall parse_lvl1
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test_err
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add eax, ecx
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jmp @b
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.not_add:
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cmp [ebx], byte "-"
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jne .unexp_char
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mov ecx, eax
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stdcall parse_lvl1
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test_err
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sub ecx, eax
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mov eax, ecx
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jmp @b
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.brk_end:
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cmp [exp_lvl], 0
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jne @f
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set_err 3
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@@:
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dec [exp_lvl]
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.end:
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ret
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.unexp_char:
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set_err 4
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endp
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; ---------------------------
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proc parse_lvl1 uses ebx ecx edx
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test_err
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stdcall parse_lvl2
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test_err
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@@:
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 0
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je .end
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cmp [ebx], byte "*"
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jne .not_mul
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inc [exp_pos]
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mov ecx, eax
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stdcall parse_lvl2
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test_err
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imul ecx, eax
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mov eax, ecx
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jmp @b
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.not_mul:
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cmp [ebx], byte "/"
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je .div_or_mod
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cmp [ebx], byte "%"
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je .div_or_mod
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jmp .end
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.div_or_mod:
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inc [exp_pos]
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mov ecx, eax
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stdcall parse_lvl2
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test_err
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cmp eax, 0
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jne .not_null
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set_err 1
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.not_null:
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xchg ecx, eax
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cdq
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div ecx
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cmp [ebx], byte "%"
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je .mod
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jmp @b
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.mod:
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mov eax, edx
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jmp @b
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.end:
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ret
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endp
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; ---------------------------
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proc parse_lvl2 uses ebx ecx edx
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test_err
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stdcall parse_lvl3
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test_err
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@@:
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 0
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je .end
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cmp [ebx], byte "^"
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jne .end
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inc [exp_pos]
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mov ecx, eax
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stdcall parse_lvl2
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test_err
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stdcall c_power
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jmp @b
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.end:
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ret
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endp
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; ---------------------------
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proc parse_lvl3 uses ebx ecx edx
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test_err
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stdcall skip_spaces
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 48
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jl @f
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cmp [ebx], byte 57
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jg @f
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stdcall parse_lvl4
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jmp .end
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@@:
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cmp [ebx], byte 97
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jl @f
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cmp [ebx], byte 122
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jg @f
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jmp .parse_func
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@@:
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inc [exp_pos]
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cmp [ebx], byte "("
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jne @f
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inc [exp_lvl]
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stdcall parse_lvl0
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test_err
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte ")"
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je .brk_ok
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set_err 2
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.brk_ok:
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inc [exp_pos]
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jmp .end
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@@:
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cmp [ebx], byte "+"
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jne @f
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stdcall parse_lvl3
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test_err
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jmp .end
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@@:
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cmp [ebx], byte "-"
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jne .unexp_char
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stdcall parse_lvl3
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test_err
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neg eax
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.end:
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stdcall skip_spaces
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ret
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.unexp_char:
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set_err 4
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.parse_func:
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mov ecx, 0
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mov dl, 0
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@@:
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cmp [ebx], byte 97
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jl @f
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cmp [ebx], byte 122
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jg @f
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cmp dl, 4
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je .unexp_char
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shl ecx, 8
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mov cl, [ebx]
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inc dl
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inc ebx
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inc [exp_pos]
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jmp @b
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@@:
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cmp ecx, "cni"
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je @f
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cmp ecx, "ced"
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je @f
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cmp ecx, "sba"
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je @f
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cmp ecx, "rqs"
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je @f
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jmp .unexp_char
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@@:
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stdcall skip_spaces
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte "("
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jne .unexp_char
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inc [exp_lvl]
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inc [exp_pos]
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stdcall parse_lvl0
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test_err
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte ")"
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je @f
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set_err 2
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@@:
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inc [exp_pos]
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stdcall skip_spaces
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cmp ecx, "cni"
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jne @f
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inc eax
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jmp .f_end
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@@:
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cmp ecx, "ced"
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jne @f
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dec eax
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jmp .f_end
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@@:
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cmp ecx, "sba"
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jne @f
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mov ecx, eax
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shr ecx, 31
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cmp cl, 1
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jne .f_end
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not eax
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inc eax
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jmp .f_end
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@@:
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cmp ecx, "rqs"
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jne @f
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imul eax, eax
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jmp .f_end
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@@:
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jmp .unexp_char
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.f_end:
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ret
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endp
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; ---------------------------
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proc parse_lvl4 uses ebx ecx
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stdcall skip_spaces
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stdcall parse_lvl5
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stdcall skip_spaces
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@@:
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 0
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je .end
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cmp [ebx], byte "^"
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jne .end
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inc [exp_pos]
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stdcall skip_spaces
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mov ecx, eax
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mov ebx, exp
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add ebx, [exp_pos]
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cmp [ebx], byte 48
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jl .unexp_char
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cmp [ebx], byte 57
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jg .unexp_char
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stdcall parse_lvl4
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stdcall c_power
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jmp @b
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.end:
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ret
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.unexp_char:
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set_err 4
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endp
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; ---------------------------
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proc parse_lvl5 uses ebx ecx
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sub eax, eax
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sub ecx, ecx
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mov ebx, exp
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add ebx, [exp_pos]
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@@:
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cmp [ebx], byte 0
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je @f
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cmp [ebx], byte 48
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jl @f
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cmp [ebx], byte 57
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jg @f
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imul eax, 10
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mov cl, [ebx]
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add eax, ecx
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sub eax, 48
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inc ebx
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inc [exp_pos]
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jmp @b
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@@:
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ret
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endp
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; ---------------------------
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proc skip_spaces uses ebx
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mov ebx, exp
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add ebx, [exp_pos]
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@@:
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cmp [ebx], byte " "
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jne @f
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inc ebx
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inc [exp_pos]
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jmp @b
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@@:
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ret
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endp
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; ---------------------------
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proc c_power uses ebx
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mov ebx, eax
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mov eax, 1
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@@:
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cmp ebx, 0
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je @f
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imul eax, ecx
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dec ebx
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jmp @b
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@@:
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ret
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endp
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; ---------------------------
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proc convert_to_str uses ebx ecx edx esi edi, _num, _str
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mov eax, [_num]
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mov esi, [_str]
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mov edi, 0
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mov ecx, eax
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and ecx, 1 shl 31
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cmp ecx, 0
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je @f
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mov [esi], byte "-"
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inc esi
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inc edi
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not eax
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inc eax
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@@:
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mov ebx, 10
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xor ecx, ecx
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@@:
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xor edx, edx
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div ebx
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push edx
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inc ecx
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inc edi
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cmp eax, 0
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jne @b
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@@:
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pop eax
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add al, "0"
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mov [esi], al
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inc esi
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loop @b
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mov [esi], byte 0
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mov eax, edi
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ret
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endp |