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#include <gu/variant.h>
#include <gu/map.h>
#include <gu/dump.h>
#include <gu/log.h>
#include <gu/enum.h>
#include <gu/file.h>
#include <pgf/pgf.h>
#include <pgf/data.h>
#include <pgf/parser.h>
#include <pgf/lexer.h>
#include <pgf/literals.h>
#include <pgf/linearize.h>
#include <pgf/expr.h>
#include <pgf/edsl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <time.h>
int main(int argc, char* argv[]) {
// Set the character locale, so we can produce proper output.
setlocale(LC_CTYPE, "");
// Create the pool that is used to allocate everything
GuPool* pool = gu_new_pool();
int status = EXIT_SUCCESS;
if (argc != 5) {
fprintf(stderr, "usage: %s pgf [.]cat from_lang to_lang\n", argv[0]);
status = EXIT_FAILURE;
goto fail;
}
char* filename = argv[1];
GuString cat;
bool robust_mode;
if (argv[2][0] == '.') {
cat = gu_str_string(argv[2]+1, pool);
robust_mode = true;
} else {
cat = gu_str_string(argv[2], pool);
robust_mode = false;
}
GuString from_lang = gu_str_string(argv[3], pool);
GuString to_lang = gu_str_string(argv[4], pool);
FILE* infile = fopen(filename, "r");
if (infile == NULL) {
fprintf(stderr, "couldn't open %s\n", filename);
status = EXIT_FAILURE;
goto fail;
}
// Create an input stream from the input file
GuIn* in = gu_file_in(infile, pool);
// Create an exception frame that catches all errors.
GuExn* err = gu_new_exn(NULL, gu_kind(type), pool);
// Read the PGF grammar.
PgfPGF* pgf = pgf_read(in, pool, err);
// If an error occured, it shows in the exception frame
if (!gu_ok(err)) {
fprintf(stderr, "Reading PGF failed\n");
status = EXIT_FAILURE;
goto fail_read;
}
// Look up the source and destination concrete categories
PgfConcr* from_concr =
gu_map_get(pgf->concretes, &from_lang, PgfConcr*);
PgfConcr* to_concr =
gu_map_get(pgf->concretes, &to_lang, PgfConcr*);
if (!from_concr || !to_concr) {
fprintf(stderr, "Unknown language\n");
status = EXIT_FAILURE;
goto fail_concr;
}
// Register a callback for the literal category Symbol
pgf_parser_add_literal(from_concr, gu_str_string("Symb", pool),
&pgf_nerc_literal_callback);
// Arbitrarily choose linearization index 0. Usually the initial
// categories we are interested in only have one field.
int lin_idx = 0;
// Create an output stream for stdout
GuOut* out = gu_file_out(stdout, pool);
// Locale-encoding writers are currently unsupported
// GuWriter* wtr = gu_locale_writer(out, pool);
// Use a writer with hard-coded utf-8 encoding for now.
GuWriter* wtr = gu_new_utf8_writer(out, pool);
// The interactive translation loop.
// XXX: This currently reads stdin directly, so it doesn't support
// encodings properly. TODO: use a locale reader for input
while (true) {
fprintf(stdout, "> ");
fflush(stdout);
char buf[4096];
char* line = fgets(buf, sizeof(buf), stdin);
if (line == NULL) {
if (ferror(stdin)) {
fprintf(stderr, "Input error\n");
status = EXIT_FAILURE;
}
break;
} else if (line[0] == '\0') {
// End nicely on empty input
break;
}
// We create a temporary pool for translating a single
// sentence, so our memory usage doesn't increase over time.
GuPool* ppool = gu_new_pool();
clock_t start = clock();
// Begin parsing a sentence of the specified category
PgfParse* parse =
pgf_parser_parse(from_concr, cat, lin_idx, pool);
if (parse == NULL) {
fprintf(stderr, "Couldn't begin parsing\n");
status = EXIT_FAILURE;
break;
}
GuReader *rdr =
gu_string_reader(gu_str_string(line, pool), pool);
PgfLexer *lexer =
pgf_new_lexer(rdr, pool);
// naive tokenization
GuExn* lex_err = gu_new_exn(NULL, gu_kind(type), pool);
PgfToken tok = pgf_lexer_next_token(lexer, lex_err, pool);
while (!gu_exn_is_raised(lex_err)) {
// feed the token to get a new parse state
parse = pgf_parse_token(parse, tok, robust_mode, ppool);
if (!parse) {
gu_puts("Unexpected token: \"", wtr, err);
gu_string_write(tok, wtr, err);
gu_puts("\"\n", wtr, err);
goto fail_parse;
}
tok = pgf_lexer_next_token(lexer, lex_err, pool);
}
if (robust_mode) {
PgfExpr expr = pgf_parse_best_result(parse, ppool);
clock_t end = clock();
double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("%.2f sec\n", cpu_time_used);
if (!gu_variant_is_null(expr)) {
gu_putc(' ', wtr, err);
// Write out the abstract syntax tree
pgf_print_expr(expr, 0, wtr, err);
gu_putc('\n', wtr, err);
}
} else {
// Now begin enumerating the resulting syntax trees
GuEnum* result = pgf_parse_result(parse, ppool);
clock_t end = clock();
double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
printf("%.2f sec\n", cpu_time_used);
while (true) {
PgfExpr expr = gu_next(result, PgfExpr, ppool);
// The enumerator will return a null variant at the
// end of the results.
if (gu_variant_is_null(expr)) {
break;
}
gu_putc(' ', wtr, err);
// Write out the abstract syntax tree
pgf_print_expr(expr, 0, wtr, err);
gu_putc('\n', wtr, err);
// Enumerate the concrete syntax trees corresponding
// to the abstract tree.
GuEnum* cts = pgf_lzr_concretize(to_concr, expr, ppool);
while (true) {
PgfCncTree ctree =
gu_next(cts, PgfCncTree, ppool);
if (gu_variant_is_null(ctree)) {
break;
}
gu_puts(" ", wtr, err);
// Linearize the concrete tree as a simple
// sequence of strings.
pgf_lzr_linearize_simple(to_concr , ctree, lin_idx,
wtr, err);
gu_putc('\n', wtr, err);
gu_writer_flush(wtr, err);
}
}
}
fail_parse:
// Free all resources allocated during parsing and linearization
gu_pool_free(ppool);
}
fail_concr:
fail_read:
fclose(infile);
fail:
gu_pool_free(pool);
return status;
}
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