83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
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/*
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** $Id: lptree.h,v 1.2 2013/03/24 13:51:12 roberto Exp $
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*/
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#if !defined(lptree_h)
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#define lptree_h
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#include "lptypes.h"
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/*
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** types of trees
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*/
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typedef enum TTag {
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TChar = 0, TSet, TAny, /* standard PEG elements */
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TTrue, TFalse,
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TRep,
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TSeq, TChoice,
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TNot, TAnd,
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TCall,
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TOpenCall,
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TRule, /* sib1 is rule's pattern, sib2 is 'next' rule */
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TGrammar, /* sib1 is initial (and first) rule */
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TBehind, /* match behind */
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TCapture, /* regular capture */
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TRunTime, /* run-time capture */
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TThrow, TRecov /* labeled failure */
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} TTag;
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/* number of siblings for each tree */
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extern const byte numsiblings[];
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/*
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** Tree trees
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** The first sibling of a tree (if there is one) is immediately after
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** the tree. A reference to a second sibling (ps) is its position
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** relative to the position of the tree itself. A key in ktable
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** uses the (unique) address of the original tree that created that
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** entry. NULL means no data.
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*/
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typedef struct TTree {
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byte tag;
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byte cap; /* kind of capture (if it is a capture) */
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unsigned short key; /* key in ktable for Lua data (0 if no key) */
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union {
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int n; /* occasional counter */
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int label; /* labeled failure */
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struct { /* labeled failure */
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int ps; /* occasional second sibling */
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int plab; /* occasional label set */
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} s; /* labeled failure */
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} u;
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} TTree;
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/*
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** A complete pattern has its tree plus, if already compiled,
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** its corresponding code
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*/
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typedef struct Pattern {
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union Instruction *code;
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int codesize;
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TTree tree[1];
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} Pattern;
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/* number of siblings for each tree */
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extern const byte numsiblings[];
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/* access to siblings */
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#define sib1(t) ((t) + 1)
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#define sib2(t) ((t) + (t)->u.s.ps)
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#endif
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