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dd� �ZdS )� TextMergea Base class for text-mergers
Subclasses must implement _merge_struct.
Many methods produce or consume structured merge information.
This is an iterable of tuples of lists of lines.
Each tuple may have a length of 1 - 3, depending on whether the region it
represents is conflicted.
Unconflicted region tuples have length 1.
Conflicted region tuples have length 2 or 3. Index 1 is text_a, e.g. THIS.
Index 1 is text_b, e.g. OTHER. Index 2 is optional. If present, it
represents BASE.
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c C s || _ || _|| _d S �N)�a_marker�b_marker� split_marker)�selfr r r � r �2/usr/lib/python3/dist-packages/breezy/textmerge.py�__init__0 s zTextMerge.__init__c C s t d��dS )z�Return structured merge info. Must be implemented by subclasses.
See TextMerge docstring for details on the format.
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_merge_struct6 s zTextMerge._merge_structc c sp |D ]f}t |�dkr*|d D ]
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}|V qV| jV qdS )z$Convert merge result tuples to linesr r N)�lenr r r )r
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zTextMerge.struct_to_linesc c sH |D ]>}t |d �dkr |V qt |�dkrt |d �dkr|V qdS )z2Iterate through input tuples, skipping empty ones.r r N)r )r
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zTextMerge.iter_usefulFc C s@ g }d}| � |�D ] }|�|� t|�dkrd}q| �|�|fS )a Produce an iterable of lines, suitable for writing to a file
Returns a tuple of (line iterable, conflict indicator)
If reprocess is True, a two-way merge will be performed on the
intermediate structure, to reduce conflict regions.
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zTextMerge.merge_linesc C s( | � | �� �}|du r | �|�S |S dS )z Produce structured merge infoTN)r r �reprocess_struct)r
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zTextMerge.merge_structc c sD | D ]:}t |�dkr |V qt|d |d ��� D ]
}|V q2qdS )aA Perform a two-way merge on structural merge info.
This reduces the size of conflict regions, but breaks the connection
between the BASE text and the conflict region.
This process may split a single conflict region into several smaller
ones, but will not introduce new conflicts.
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r c @ s. e Zd ZdZejejejfdd�Zdd� Z dS )r z� Two-way merge.
In a two way merge, common regions are shown as unconflicting, and uncommon
regions produce conflicts.
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�lines_a�lines_b)r
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� s zMerge2.__init__c c s� t �d| j| j�}d}d}|�� D ]N\}}}| j||� | j||� fV | j||| � fV || }|| }q"| j|d� | j|d� fV dS )zGReturn structured merge info.
See TextMerge docstring.
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