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#ifndef PGF_LEXER_H_
#define PGF_LEXER_H_
#include <gu/read.h>
#include <pgf/expr.h>
/// A single lexical token
typedef GuString PgfToken;
typedef GuSeq PgfTokens; // -> PgfToken
typedef struct {
prob_t prob;
PgfToken tok;
} PgfTokenProb;
typedef struct {
PgfToken (*read_token)();
PgfToken tok;
} PgfLexer;
PgfLexer*
pgf_new_simple_lexer(GuReader *rdr, GuPool *pool);
PgfToken
pgf_lexer_read_token(PgfLexer *lexer, GuExn* err);
PgfToken
pgf_lexer_current_token(PgfLexer *lexer);
#endif // PGF_LEXER_H_
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