82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
//
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// API additions for writing grammar and semantic actions more concisely
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//
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#ifndef HAMMER_EXAMPLES_GLUE__H
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#define HAMMER_EXAMPLES_GLUE__H
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#include <assert.h>
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#include "../src/hammer.h"
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//
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// Grammar specification
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//
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#define H_RULE(rule, def) const HParser *rule = def
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#define H_ARULE(rule, def) const HParser *rule = h_action(def, act_ ## rule)
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#define H_VRULE(rule, def) const HParser *rule = \
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h_attr_bool(def, validate_ ## rule)
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#define H_VARULE(rule, def) const HParser *rule = \
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h_attr_bool(h_action(def, act_ ## rule), validate_ ## rule)
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#define H_AVRULE(rule, def) const HParser *rule = \
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h_action(h_attr_bool(def, validate_ ## rule), act_ ## rule)
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//
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// Pre-fab semantic actions
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//
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const HParsedToken *h_act_ignore(const HParseResult *p);
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const HParsedToken *h_act_index(int i, const HParseResult *p);
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const HParsedToken *h_act_flatten(const HParseResult *p);
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// Define 'myaction' as a specialization of 'paction' by supplying the leading
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// parameters.
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#define H_ACT_APPLY(myaction, paction, ...) \
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const HParsedToken *myaction(const HParseResult *p) { \
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return paction(__VA_ARGS__, p); \
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}
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//
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// Working with HParsedTokens
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//
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// Standard short-hand for arena-allocating a variable in a semantic action.
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#define H_ALLOC(TYP) \
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((TYP *) h_arena_malloc(p->arena, sizeof(TYP)))
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// Token constructors...
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HParsedToken *h_make(HArena *arena, HTokenType type, void *value);
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HParsedToken *h_make_seq(HArena *arena);
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// Standard short-hand to make a user-type token.
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#define H_MAKE(TYP, VAL) h_make(p->arena, TT_ ## TYP, VAL)
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// Sequences...
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// Access a sequence element by index.
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HParsedToken *h_seq_index_token(const HParsedToken *p, size_t i);
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// Access a user-type element of a sequence by index.
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#define H_SEQ_INDEX(TYP, SEQ, IDX) \
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((TYP *) h_seq_index(TT_ ## TYP, SEQ, IDX))
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// Standard short-hand to access a user-type field on a sequence token.
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#define H_FIELD(TYP, IDX) H_SEQ_INDEX(TYP, p->ast, IDX)
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// Append elements to a sequence.
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void h_seq_snoc(HParsedToken *xs, const HParsedToken *x); // append one
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void h_seq_append(HParsedToken *xs, const HParsedToken *ys); // append many
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// Flatten nested sequences into one.
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const HParsedToken *h_seq_flatten(HArena *arena, const HParsedToken *p);
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// Helpers for implementing H_SEQ_INDEX.
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void *h_seq_index(HTokenType type, const HParsedToken *p, size_t i); // XXX helper
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HParsedToken *h_carray_index(const HCountedArray *a, size_t i); // XXX -> internal
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#endif
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