The theme expression tokenizer

Themes can use a simple expression language to represent the values of things. More...


Data Structures
struct	PosToken
	A token, as output by the tokeniser. More...
Functions
static gboolean	parse_number (const char p, const char end_return, PosToken next, GError **err)
	Tokenises a number in an expression.
static gboolean	pos_tokenize (const char expr, PosToken tokens_p, int n_tokens_p, GError **err)
	Tokenises an expression.

Detailed Description

Themes can use a simple expression language to represent the values of things.

This is the tokeniser used for that language.

Bug:: We could remove almost all this code by using GScanner instead, but we would also have to find every expression in every existing theme we could and make sure the parse trees were the same.

static gboolean parse_number	(	const char *	p,
		const char **	end_return,
		PosToken *	next,
		GError **	err
	)			`[static]`

Tokenises a number in an expression.

Parameters:

	p	a pointer into a string representing an operation; part of an expression somewhere, so not null-terminated
	end_return	set to a pointer to the end of the number found; but not updated if no number was found at all
	next	set to either an integer or a float token
`[out]`	err	set to the problem if there was a problem

Returns:: TRUE if a valid number was found, FALSE otherwise (and "err" will have been set)

Definition at line 1565 of file theme.c.

Referenced by pos_tokenize().

static gboolean pos_tokenize	(	const char *	expr,
		PosToken **	tokens_p,
		int *	n_tokens_p,
		GError **	err
	)			`[static]`

Tokenises an expression.

Parameters:

	expr	The expression
`[out]`	tokens_p	The resulting tokens
`[out]`	n_tokens_p	The number of resulting tokens
`[out]`	err	set to the problem if there was a problem

Returns:: True if the expression was successfully tokenised; false otherwise.

Definition at line 1697 of file theme.c.