66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
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#include "glue.h"
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// The action equivalent of h_ignore.
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const HParsedToken *act_ignore(const HParseResult *p)
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{
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return NULL;
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}
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// Helper to build HAction's that pick one index out of a sequence.
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const HParsedToken *act_index(int i, const HParseResult *p)
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{
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if(!p) return NULL;
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const HParsedToken *tok = p->ast;
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if(!tok || tok->token_type != TT_SEQUENCE)
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return NULL;
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const HCountedArray *seq = tok->seq;
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size_t n = seq->used;
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if(i<0 || (size_t)i>=n)
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return NULL;
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else
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return tok->seq->elements[i];
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}
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const HParsedToken *act_index0(const HParseResult *p)
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{
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return act_index(0, p);
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}
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HParsedToken *h_make_token(HArena *arena, HTokenType type, void *value)
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{
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HParsedToken *ret = h_arena_malloc(arena, sizeof(HParsedToken));
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ret->token_type = type;
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ret->user = value;
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return ret;
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}
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#define H_MAKE(TYP) \
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((TYP ## _t *) h_arena_malloc(p->arena, sizeof(TYP ## _t)))
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#define H_MAKE_TOKEN(TYP, VAL) \
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h_make_token(p->arena, TT_ ## TYP, VAL)
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HParsedToken *h_carray_index(const HCountedArray *a, size_t i)
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{
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assert(i < a->used);
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return a->elements[i];
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}
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HParsedToken *h_seq_index(const HParsedToken *p, size_t i)
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{
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assert(p->token_type == TT_SEQUENCE);
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return h_carray_index(p->seq, i);
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}
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void *h_seq_index_user(HTokenType type, const HParsedToken *p, size_t i)
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{
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HParsedToken *elem = h_seq_index(p, i);
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assert(elem->token_type == (HTokenType)type);
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return elem->user;
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}
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