line_offset_list.h File Reference

A list of byte offsets of newlines in a string. More...

#include "prism/compiler/exported.h"
#include "prism/compiler/nonnull.h"
#include <stddef.h>
#include <stdint.h>

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Data Structures
struct	pm_line_offset_list_t
	A list of offsets of the start of lines in a string. More...
struct	pm_line_column_t
	A line and column in a string. More...

Functions
PRISM_EXPORTED_FUNCTION pm_line_column_t	pm_line_offset_list_line_column (const pm_line_offset_list_t *list, uint32_t cursor, int32_t start_line) PRISM_NONNULL(1)
	Returns the line and column of the given offset.

Detailed Description

A list of byte offsets of newlines in a string.

When compiling the syntax tree, it's necessary to know the line and column of many nodes. This is necessary to support things like error messages, tracepoints, etc.

It's possible that we could store the start line, start column, end line, and end column on every node in addition to the offsets that we already store, but that would be quite a lot of memory overhead.

Function Documentation

pm_line_offset_list_line_column()

PRISM_EXPORTED_FUNCTION pm_line_column_t pm_line_offset_list_line_column	(	const pm_line_offset_list_t *	list,
		uint32_t	cursor,
		int32_t	start_line
	)

Returns the line and column of the given offset.

If the offset is not in the list, the line and column of the closest offset less than the given offset are returned.

Parameters

list	The list to search.
cursor	The offset to search for.
start_line	The line to start counting from.

Returns

The line and column of the given offset.