/*
* Syntax highlighting DFA interpreter
* Copyright
* (C) 2004 Joseph H. Allen
*
* This file is part of JOE (Joe's Own Editor)
*/
/* State */
struct high_state {
ptrdiff_t no; /* State number */
const char *name; /* Highlight state name */
int color; /* Color for this state */
struct color_def *colorp; /* Mapped color definition */
struct Rtree rtree; /* Character map (character ->struct high_cmd *) */
struct high_cmd *dflt; /* Default for no match */
struct high_cmd *same_delim; /* Same delimiter */
struct high_cmd *delim; /* Matching delimiter */
};
/* Parameter list */
struct high_param {
struct high_param *next;
char *name;
};
/* Command (transition) */
struct high_cmd {
unsigned noeat : 1; /* Set to give this character to next state */
unsigned start_buffering : 1; /* Set if we should start buffering */
unsigned stop_buffering : 1; /* Set if we should stop buffering */
unsigned save_c : 1; /* Save character */
unsigned save_s : 1; /* Save string */
unsigned ignore : 1; /* Set to ignore case */
unsigned start_mark : 1; /* Set to begin marked area including this char */
unsigned stop_mark : 1; /* Set to end marked area excluding this char */
unsigned recolor_mark : 1; /* Set to recolor marked area with new state */
unsigned rtn : 1; /* Set to return */
unsigned reset : 1; /* Set to reset the call stack */
ptrdiff_t recolor; /* No. chars to recolor if <0. */
struct high_state *new_state; /* The new state */
ZHASH *keywords; /* Hash table of keywords */
struct high_cmd *delim; /* Matching delimiter */
struct high_syntax *call; /* Syntax subroutine to call */
};
/* Call stack frame */
struct high_frame {
struct high_frame *parent; /* Caller's frame */
struct high_frame *child; /* First callee's frame */
struct high_frame *sibling; /* Caller's next callee's frame */
struct high_syntax *syntax; /* Current syntax subroutine */
struct high_state *return_state; /* Return state in the caller's subroutine */
};
/* Loaded form of syntax file or subroutine */
struct high_syntax {
struct high_syntax *next; /* Linked list of loaded syntaxes */
char *name; /* Name of this syntax */
char *subr; /* Name of the subroutine (or NULL for whole file) */
struct high_param *params; /* Parameters defined */
struct high_state **states; /* The states of this syntax. states[0] is idle state */
HASH *ht_states; /* Hash table of states */
ptrdiff_t nstates; /* No. states */
ptrdiff_t szstates; /* Malloc size of states array */
struct color_def *color; /* Linked list of color definitions */
struct high_cmd default_cmd; /* Default transition for new states */
struct high_frame *stack_base; /* Root of run-time call tree */
};
/* Find a syntax. Load it if necessary. */
struct high_syntax *load_syntax(const char *name);
/* Parse a lines. Returns new state. */
HIGHLIGHT_STATE parse(struct high_syntax *syntax,P *line,HIGHLIGHT_STATE state,struct charmap *charmap);
extern int *attr_buf;
#define clear_state(s) (((s)->saved_s = 0), ((s)->state = 0), ((s)->stack = 0))
#define invalidate_state(s) (((s)->state = -1), ((s)->saved_s = 0), ((s)->stack = 0))
#define move_state(to,from) (*(to)= *(from))
#define eq_state(x,y) ((x)->state == (y)->state && (x)->stack == (y)->stack && (x)->saved_s == (y)->saved_s)
extern struct high_syntax *syntax_list;
void dump_syntax(BW *bw);
