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https://github.com/lihop/godot-xterm.git
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198 lines
7.5 KiB
GDScript
198 lines
7.5 KiB
GDScript
# Copyright (c) 2019 The xterm.js authors. All rights reserved.
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# Ported to GDScript by the GodotXterm authors.
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# License MIT
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extends Object
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# Evaluates and returns indexes to be removed after a reflow larger occurs. Lines will be removed
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# when a wrapped line unwraps.
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# @param lines The buffer lines.
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# @param newCols The columns after resize.
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static func reflow_larger_get_lines_to_remove(lines, old_cols: int, new_cols: int,
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buffer_absolute_y: int, null_cell) -> PoolIntArray:
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# Gather all BufferLines that need to be removed from the Buffer here so that they can be
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# batched up and only committed once
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var to_remove = PoolIntArray([])
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var y = 0
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while y < lines.length - 1:
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# Check if this row is wrapped
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var i = y
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i += 1
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var next_line = lines.get_line(i)
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if not next_line.is_wrapped:
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y += 1
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continue
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# Check how many lines it's wrapped for
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var wrapped_lines = [lines.get_line(y)]
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while i < lines.length and next_line.is_wrapped:
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wrapped_lines.append(next_line)
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i += 1
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next_line = lines.get_line(i)
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# If these lines contain the cursor don't touch them, the program will handle fixing up wrapped
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# lines with the cursor
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if buffer_absolute_y >= y and buffer_absolute_y < i:
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y += wrapped_lines.size() - 1
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y += 1
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continue
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# Copy buffer data to new locations
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var dest_line_index = 0
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var dest_col = get_wrapped_line_trimmed_length(wrapped_lines, dest_line_index, old_cols)
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var src_line_index = 1
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var src_col = 0
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while src_line_index < wrapped_lines.size():
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var src_trimmed_line_length = get_wrapped_line_trimmed_length(wrapped_lines, src_line_index, old_cols)
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var src_remaining_cells = src_trimmed_line_length - src_col
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var dest_remaining_cells = new_cols - dest_col
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var cells_to_copy = min(src_remaining_cells, dest_remaining_cells)
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wrapped_lines[dest_line_index].copy_cells_from(wrapped_lines[src_line_index], src_col, dest_col, cells_to_copy, false)
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dest_col += cells_to_copy
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if dest_col == new_cols:
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dest_line_index += 1
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dest_col = 0
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src_col += cells_to_copy
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if src_col == src_trimmed_line_length:
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src_line_index += 1
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src_col = 0
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# Make sure the last cell isn't wide, if it is copy it to the current dest
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if dest_col == 0 and dest_line_index != 0:
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if wrapped_lines[dest_line_index - 1].get_width(new_cols - 1) == 2:
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wrapped_lines[dest_line_index].copy_cells_from(wrapped_lines[dest_line_index - 1], new_cols - 1, dest_col, 1, false)
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dest_col += 1
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# Null out the end of the last row
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wrapped_lines[dest_line_index - 1].set_cell(new_cols - 1, null_cell)
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# Clear out remaining cells or fragments could remain;
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var replaced = wrapped_lines[dest_line_index].translate_to_string()
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wrapped_lines[dest_line_index].replace_cells(dest_col, new_cols, null_cell)
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# Work backwards and remove any rows at the end that only contain null cells
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var count_to_remove = 0
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for j in range(wrapped_lines.size() - 1, 0, -1):
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if j > dest_line_index or wrapped_lines[j].get_trimmed_length() == 0:
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count_to_remove += 1
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else:
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break
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if count_to_remove > 0:
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to_remove.append(y + wrapped_lines.size() - count_to_remove) # index
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to_remove.append(count_to_remove)
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y += wrapped_lines.size() - 1
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y += 1
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return to_remove
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# Creates and return the new layout for lines given an array of indexes to be removed.
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# @param lines The buffer lines.
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# @param to_remove The indexes to remove.
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static func reflow_larger_create_new_layout(lines, to_remove: PoolIntArray):
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var layout = PoolIntArray([])
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# First iterate through the list and get the actual indexes to use for rows
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var next_to_remove_index = 0
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var next_to_remove_start = to_remove[next_to_remove_index]
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var count_removed_so_far = 0
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var i = 0
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while i < lines.length:
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if next_to_remove_start == i:
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next_to_remove_index += 1
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var count_to_remove = to_remove[next_to_remove_index]
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# Tell markers that there was a deletion
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lines.emit_signal("deleted", i - count_removed_so_far, count_to_remove)
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i += count_to_remove - 1
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count_removed_so_far += count_to_remove
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next_to_remove_index += 1
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next_to_remove_start = to_remove[next_to_remove_index] if next_to_remove_index < to_remove.size() else null
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else:
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layout.append(i)
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i += 1
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return { "layout": layout, "count_removed": count_removed_so_far }
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# Applies a new layout to the buffer. This essentially does the same as many splice calls but it's
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# done all at once in a single iteration through the list since splice is very expensive.
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# @param lines The buffer lines.
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# @param new_layout The new layout to apply.
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static func reflow_larger_apply_new_layout(lines, new_layout: PoolIntArray) -> void:
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# Record original lines so they don't get overridden when we rearrange the list
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var new_layout_lines = []
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for i in range(new_layout.size()):
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new_layout_lines.append(lines.get_line(new_layout[i]))
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# Rearrange the list
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for i in range(new_layout_lines.size()):
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lines.set_line(i, new_layout_lines[i])
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lines.length = new_layout.size()
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# Gets the new line lengths for a given wrapped line. The purpose of this function it to pre-
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# compute the wrapping points since wide characters may need to be wrapped onto the following line.
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# This function will return an array of numbers of where each line wraps to, the resulting array
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# will only contain the values `newCols` (when the line does not end with a wide character) and
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# `new_cols - 1` (when the line does end with a wide character), except for the last value which
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# will contain the remaining items to fill the line.
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#
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# Calling this with a `new_cols` value of `1` will lock up.
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#
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# @param wrapped_lines The wrapped lines to evaluate.
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# @param old_cols The columns before resize.
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# @param new_cols The columns after resize.
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static func reflow_smaller_get_new_line_lengths(wrapped_lines: Array, old_cols: int, new_cols: int) -> PoolIntArray:
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var new_line_lengths = PoolIntArray([])
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var cells_needed: int
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for i in range(wrapped_lines.size()):
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cells_needed += get_wrapped_line_trimmed_length(wrapped_lines, i, old_cols)
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# Use src_col and scr_line to find the new wrapping point, use that to get the cells_available and
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# lines_needed
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var src_col = 0
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var src_line = 0
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var cells_available = 0
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while cells_available < cells_needed:
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if cells_needed - cells_available < new_cols:
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# Add the final line and exit the loop
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new_line_lengths.append(cells_needed - cells_available)
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break
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src_col += new_cols
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var old_trimmed_length = get_wrapped_line_trimmed_length(wrapped_lines, src_line, old_cols)
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if src_col > old_trimmed_length:
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src_col -= old_trimmed_length
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src_line += 1
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var ends_with_wide = wrapped_lines[src_line].get_width(src_col - 1) == 2
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if ends_with_wide:
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src_col -= 1
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var line_length = new_cols - 1 if ends_with_wide else new_cols
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new_line_lengths.append(line_length)
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cells_available += line_length
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return new_line_lengths
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static func get_wrapped_line_trimmed_length(lines: Array, i: int, cols: int) -> int:
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# If this is the last row in the wrapped line, get the actual trimmed length
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if i == lines.size() - 1:
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return lines[i].get_trimmed_length()
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# Detect whether the following line starts with a wide character and the end of the current line
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# is null, if so then we can be pretty sure the null character should be excluded from the line
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# length
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var ends_in_null = not (lines[i].has_content(cols - 1)) and lines[i].get_width(cols - 1) == 1
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var following_line_starts_with_wide = lines[i + 1].get_width(0) == 2
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if ends_in_null and following_line_starts_with_wide:
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return cols - 1
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return cols
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