package fmlib_parse

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package fmlib_parse

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Represent a position in a text file.

type t

Position in a text file.

type range = t * t

val start : t

Position with points to the start of a textfile (line = 0, column = 0).

val line : t -> int

line pos The line number corresponding to the position p. Note: The first line is line 0.

val column : t -> int

column pos The column number corresponding to the position p. Note: The first column is column 0.

val next : char -> t -> t

next next_char pos: Advance the position by using the next character. If the next character is a newline, then the line number is increment and the column number is reset to 0.

val next_line : t -> t

next_line pos Advance the position to the start of the next line.

val next_column : t -> t

next_column pos Advance the column position by 1.

val is_less_equal : t -> t -> bool

is_less_equal p1 p2 Are p1 and p2 in the correct order i.e. p2 is not before p1.

val is_valid_range : range -> bool

Is the range a valid range in a file i.e. are both positions valid and is the first position before or at the second position?

val merge : range -> range -> range

merge range_1 range_2

Merge the ranges range_1 and range_2 i.e. when range_1 = (pos1, _) and range_2 = (_, pos2) then the merged range is (pos1, pos2).

Precondition: Both are valid ranges and range_1 starts before range_2 and range_1 ends before range_2.