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# 02110-1301 USA. |
# 02110-1301 USA. |
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# |
# |
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require "exception.rb" |
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module Edmaru |
module Edmaru |
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class EndOfBufferException < EdmaruException |
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def initialize |
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super("End of buffer.") |
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end |
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end |
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#The instance of this class represents one string sequence. |
#The instance of this class represents one string sequence. |
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class Buffer |
class Buffer |
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#Insert the specified string to the specified position |
#Insert the specified string to the specified position |
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# |
# |
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#=== Arguments |
#=== Arguments |
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#_row_ :: Row position or line number. |
#_row_ :: Row position or line number. |
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#_col_ :: Column position. |
#_col_ :: Column position. |
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#_str_ :: A string to be inserted. |
#_str_ :: A string to be inserted. |
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refresh_windows |
refresh_windows |
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end |
end |
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#Delete one character at the specified position |
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# |
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#=== Arguments |
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#_row_ :: Row position or line number. |
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#_col_ :: Column position. |
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def delete_at(row, col) |
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if !valid_position?(row, col) |
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raise "Invalid position was specified for 'delete' method." |
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end |
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if col >= @lines[row].size && |
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row == (lines.size - 1) |
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raise EndOfBufferException.new |
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elsif col >= @lines[row].size |
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#Concatenate the next line behind the current line. |
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@lines[row] << @lines[row + 1] |
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@lines.delete_at(row + 1) |
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refresh_windows |
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else |
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@lines[row] = |
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@lines[row][0, col] + @lines[row][col + 1 .. -1] |
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refresh_windows |
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end |
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end |
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#Remove a string in the specified line behind the cursor. |
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# |
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#=== Arguments |
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#_row_ :: Row position or line number. |
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#_col_ :: Column position. |
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# |
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#=== Return |
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#Deleted string. |
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def delete_line(row, col) |
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if !valid_position?(row, col) |
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raise "Invalid position was specified for 'delete' method." |
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end |
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if col >= @lines[row].size && |
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row == (lines.size - 1) |
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raise EndOfBufferException.new |
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elsif col >= @lines[row].size |
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#Concatenate the next line behind the current line. |
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@lines[row] << @lines[row + 1] |
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@lines.delete_at(row + 1) |
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refresh_windows |
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return "\n" |
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else |
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ret = @lines[row][col .. -1] |
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@lines[row] = @lines[row][0, col] |
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refresh_windows |
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return ret |
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end |
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end |
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#Append the specified string to the end of this buffer. |
#Append the specified string to the end of this buffer. |
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# |
# |
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#=== Argument |
#=== Argument |
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