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- YACC User Commands YACC
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- NNAAMMEE
- yacc - yet another compiler-compiler
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- SSYYNNOOPPSSIISS
- yyaacccc [ --vvdd ] grammar
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- DDEESSCCRRIIPPTTIIOONN
- _Y_a_c_c converts a context-free grammar into a set of tables
- for a simple automaton which executes an LR(1) parsing algo-
- rithm. The grammar may be ambiguous; specified precedence
- rules are used to break ambiguities.
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- The output file, _y._t_a_b._c, must be compiled by the C compiler
- to produce a program _y_y_p_a_r_s_e. This program must be loaded
- with the lexical analyzer program, _y_y_l_e_x, as well as _m_a_i_n
- and _y_y_e_r_r_o_r, an error handling routine. These routines must
- be supplied by the user; _L_e_x(1) is useful for creating lexi-
- cal analyzers usable by _y_a_c_c.
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- If the --vv flag is given, the file _y._o_u_t_p_u_t is prepared,
- which contains a description of the parsing tables and a
- report on conflicts generated by ambiguities in the grammar.
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- If the -dd flag is used, the file _y._t_a_b._h is generated with
- the _d_e_f_i_n_e statements that associate the _y_a_c_c-assigned
- `token codes' with the user-declared `token names'. This
- allows source files other than _y._t_a_b._c to access the token
- codes.
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- FFIILLEESS
- y.output
- y.tab.c
- y.tab.h defines for token names
- yacc.tmp, yacc.acts temporary files
- /usr/lib/yaccpar parser prototype for C programs
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- SSEEEE AALLSSOO
- _l_e_x(1)
- _L_R _P_a_r_s_i_n_g by A. V. Aho and S. C. Johnson, Computing Sur-
- veys, June, 1974.
- _Y_A_C_C - _Y_e_t _A_n_o_t_h_e_r _C_o_m_p_i_l_e_r _C_o_m_p_i_l_e_r by S. C. Johnson.
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- DDIIAAGGNNOOSSTTIICCSS
- The number of reduce-reduce and shift-reduce conflicts is
- reported on the standard output; a more detailed report is
- found in the _y._o_u_t_p_u_t file. Similarly, if some rules are
- not reachable from the start symbol, this is also reported.
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- BBUUGGSS
- Because file names are fixed, at most one _y_a_c_c process can
- be active in a given directory at a time.
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- Sprite v1.0 April 29, 1985 1
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