added experimental script for chunking in the C runtime

src/runtime/c/utils/pgf-chunk.c

@@ -0,0 +1,160 @@
+// Don't give too much hope to this script. It is doing the wrong thing
+// but let's see how far we can get with it.
+
+#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 != 4) {
+		fprintf(stderr, "usage: %s pgf cat from_lang\n", argv[0]);
+		status = EXIT_FAILURE;
+		goto fail;
+	}
+	char* filename = argv[1];
+
+	GuString cat = gu_str_string(argv[2], pool);
+
+	GuString from_lang = gu_str_string(argv[3], 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;
+	}
+
+	if (!pgf_load_meta_child_probs(pgf, "../../../treebanks/PennTreebank/ParseEngAbs3.probs", pool)) {
+		fprintf(stderr, "Loading meta child probs 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*);
+	if (!from_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);
+
+	// 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);
+
+	// We will keep the latest results in the 'ppool' and
+	// we will iterate over them by using 'result'.
+	GuPool* ppool = NULL;
+
+	// 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) {
+		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 (strcmp(line, "") == 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.
+		ppool = gu_new_pool();
+
+		// Begin parsing a sentence of the specified category
+		PgfParseState* state =
+			pgf_parser_init_state(from_concr, cat, 0, ppool);
+		if (state == NULL) {
+			fprintf(stderr, "Couldn't begin parsing\n");
+			status = EXIT_FAILURE;
+			break;
+		}
+		
+		GuReader *rdr =
+			gu_string_reader(gu_str_string(line, ppool), ppool);
+		PgfLexer *lexer =
+			pgf_new_lexer(rdr, ppool);
+
+		// Tokenization
+		GuExn* lex_err = gu_new_exn(NULL, gu_kind(type), ppool);
+		PgfToken tok = pgf_lexer_next_token(lexer, lex_err, ppool);
+		while (!gu_exn_is_raised(lex_err)) {
+			// feed the token to get a new parse state
+			state = pgf_parser_next_state(state, tok, ppool);
+			if (!state) {
+				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, ppool);
+		}
+
+		pgf_parse_print_chunks(state);
+		continue;
+	fail_parse:
+		// Free all resources allocated during parsing and linearization
+		gu_pool_free(ppool);
+		ppool = NULL;
+	}
+fail_concr:
+fail_read:
+	fclose(infile);
+fail:
+	gu_pool_free(pool);
+	return status;
+}