diff options
Diffstat (limited to 'e-util/e-sexp.c')
| -rw-r--r-- | e-util/e-sexp.c | 1201 |
1 files changed, 0 insertions, 1201 deletions
diff --git a/e-util/e-sexp.c b/e-util/e-sexp.c deleted file mode 100644 index 69e1c0ca15..0000000000 --- a/e-util/e-sexp.c +++ /dev/null @@ -1,1201 +0,0 @@ -/* - * Copyright 2000 HelixCode (http://www.helixcode.com). - * - * A simple, extensible s-exp evaluation engine. - * - * Author : - * Michael Zucchi <notzed@helixcode.com> - - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 - * USA - */ - -/* - The following built-in s-exp's are supported: - - list = (and list*) - perform an intersection of a number of lists, and return that. - - bool = (and bool*) - perform a boolean AND of boolean values. - - list = (or list*) - perform a union of a number of lists, returning the new list. - - bool = (or bool*) - perform a boolean OR of boolean values. - - int = (+ int*) - Add integers. - - string = (+ string*) - Concat strings. - - int = (- int int*) - Subtract integers from the first. - - Comparison operators: - - bool = (< int int) - bool = (> int int) - bool = (= int int) - - bool = (< string string) - bool = (> string string) - bool = (= string string) - Perform a comparision of 2 integers, or 2 string values. - - Function flow: - - type = (if bool function) - type = (if bool function function) - Choose a flow path based on a boolean value - - type = (begin func func func) - Execute a sequence. The last function return is the return type. -*/ - -#include <glib.h> -#include <stdio.h> -#include <stdlib.h> -#include <time.h> -#include <string.h> - -#include "e-memory.h" -#include "e-sexp.h" - -#define p(x) /* parse debug */ -#define r(x) /* run debug */ -#define d(x) /* general debug */ - - -static struct _ESExpTerm * parse_list(ESExp *f, int gotbrace); -static struct _ESExpTerm * parse_value(ESExp *f); - -static void parse_dump_term(struct _ESExpTerm *t, int depth); - -#ifdef E_SEXP_IS_GTK_OBJECT -static GtkObjectClass *parent_class; -#endif - -static GScannerConfig scanner_config = -{ - ( " \t\r\n") /* cset_skip_characters */, - ( G_CSET_a_2_z - "_+-<=>" - G_CSET_A_2_Z) /* cset_identifier_first */, - ( G_CSET_a_2_z - "_0123456789-<>" - G_CSET_A_2_Z - G_CSET_LATINS - G_CSET_LATINC ) /* cset_identifier_nth */, - ( ";\n" ) /* cpair_comment_single */, - - FALSE /* case_sensitive */, - - TRUE /* skip_comment_multi */, - TRUE /* skip_comment_single */, - TRUE /* scan_comment_multi */, - TRUE /* scan_identifier */, - TRUE /* scan_identifier_1char */, - FALSE /* scan_identifier_NULL */, - TRUE /* scan_symbols */, - FALSE /* scan_binary */, - TRUE /* scan_octal */, - TRUE /* scan_float */, - TRUE /* scan_hex */, - FALSE /* scan_hex_dollar */, - TRUE /* scan_string_sq */, - TRUE /* scan_string_dq */, - TRUE /* numbers_2_int */, - FALSE /* int_2_float */, - FALSE /* identifier_2_string */, - TRUE /* char_2_token */, - FALSE /* symbol_2_token */, - FALSE /* scope_0_fallback */, -}; - -/* jumps back to the caller of f->failenv, only to be called from inside a callback */ -void -e_sexp_fatal_error(struct _ESExp *f, char *why, ...) -{ - va_list args; - - if (f->error) - g_free(f->error); - - va_start(args, why); - f->error = g_strdup_vprintf(why, args); - va_end(args); - - longjmp(f->failenv, 1); -} - -const char * -e_sexp_error(struct _ESExp *f) -{ - return f->error; -} - -struct _ESExpResult * -e_sexp_result_new(struct _ESExp *f, int type) -{ - struct _ESExpResult *r = e_memchunk_alloc0(f->result_chunks); - r->type = type; - return r; -} - -void -e_sexp_result_free(struct _ESExp *f, struct _ESExpResult *t) -{ - if (t == NULL) - return; - - switch(t->type) { - case ESEXP_RES_ARRAY_PTR: - g_ptr_array_free(t->value.ptrarray, TRUE); - break; - case ESEXP_RES_BOOL: - case ESEXP_RES_INT: - break; - case ESEXP_RES_STRING: - g_free(t->value.string); - break; - case ESEXP_RES_UNDEFINED: - break; - } - e_memchunk_free(f->result_chunks, t); -} - -/* used in normal functions if they have to abort, and free their arguments */ -void -e_sexp_resultv_free(struct _ESExp *f, int argc, struct _ESExpResult **argv) -{ - int i; - - for (i=0;i<argc;i++) { - e_sexp_result_free(f, argv[i]); - } -} - -/* implementations for the builtin functions */ - -/* can you tell, i dont like glib? */ -/* we can only itereate a hashtable from a called function */ -struct _glib_sux_donkeys { - int count; - GPtrArray *uids; -}; - -/* ok, store any values that are in all sets */ -static void -g_lib_sux_htand(char *key, int value, struct _glib_sux_donkeys *fuckup) -{ - if (value == fuckup->count) { - g_ptr_array_add(fuckup->uids, key); - } -} - -/* or, store all unique values */ -static void -g_lib_sux_htor(char *key, int value, struct _glib_sux_donkeys *fuckup) -{ - g_ptr_array_add(fuckup->uids, key); -} - -static ESExpResult * -term_eval_and(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r, *r1; - GHashTable *ht = g_hash_table_new(g_str_hash, g_str_equal); - struct _glib_sux_donkeys lambdafoo; - int type=-1; - int bool = TRUE; - int i; - - r(printf("( and\n")); - - r = e_sexp_result_new(f, ESEXP_RES_UNDEFINED); - - for (i=0;bool && i<argc;i++) { - r1 = e_sexp_term_eval(f, argv[i]); - if (type == -1) - type = r1->type; - if (type != r1->type) { - e_sexp_result_free(f, r); - e_sexp_result_free(f, r1); - g_hash_table_destroy(ht); - e_sexp_fatal_error(f, "Invalid types in AND"); - } else if ( r1->type == ESEXP_RES_ARRAY_PTR ) { - char **a1; - int l1, j; - - a1 = (char **)r1->value.ptrarray->pdata; - l1 = r1->value.ptrarray->len; - for (j=0;j<l1;j++) { - int n; - n = (int)g_hash_table_lookup(ht, a1[j]); - g_hash_table_insert(ht, a1[j], (void *)n+1); - } - } else if ( r1->type == ESEXP_RES_BOOL ) { - bool &= r1->value.bool; - } - e_sexp_result_free(f, r1); - } - - if (type == ESEXP_RES_ARRAY_PTR) { - lambdafoo.count = argc; - lambdafoo.uids = g_ptr_array_new(); - g_hash_table_foreach(ht, (GHFunc)g_lib_sux_htand, &lambdafoo); - r->type = ESEXP_RES_ARRAY_PTR; - r->value.ptrarray = lambdafoo.uids; - } else if (type == ESEXP_RES_BOOL) { - r->type = ESEXP_RES_BOOL; - r->value.bool = bool; - } - - g_hash_table_destroy(ht); - - return r; -} - -static ESExpResult * -term_eval_or(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r, *r1; - GHashTable *ht = g_hash_table_new(g_str_hash, g_str_equal); - struct _glib_sux_donkeys lambdafoo; - int type = -1; - int bool = FALSE; - int i; - - r(printf("(or \n")); - - r = e_sexp_result_new(f, ESEXP_RES_UNDEFINED); - - for (i=0;!bool && i<argc;i++) { - r1 = e_sexp_term_eval(f, argv[i]); - if (type == -1) - type = r1->type; - if (r1->type != type) { - e_sexp_result_free(f, r); - e_sexp_result_free(f, r1); - g_hash_table_destroy(ht); - e_sexp_fatal_error(f, "Invalid types in OR"); - } else if (r1->type == ESEXP_RES_ARRAY_PTR) { - char **a1; - int l1, j; - - a1 = (char **)r1->value.ptrarray->pdata; - l1 = r1->value.ptrarray->len; - for (j=0;j<l1;j++) { - g_hash_table_insert(ht, a1[j], (void *)1); - } - } else if (r1->type == ESEXP_RES_BOOL) { - bool |= r1->value.bool; - } - e_sexp_result_free(f, r1); - } - - if (type == ESEXP_RES_ARRAY_PTR) { - lambdafoo.count = argc; - lambdafoo.uids = g_ptr_array_new(); - g_hash_table_foreach(ht, (GHFunc)g_lib_sux_htor, &lambdafoo); - r->type = ESEXP_RES_ARRAY_PTR; - r->value.ptrarray = lambdafoo.uids; - } else if (type == ESEXP_RES_BOOL) { - r->type = ESEXP_RES_BOOL; - r->value.bool = bool; - } - g_hash_table_destroy(ht); - - return r; -} - -static ESExpResult * -term_eval_not(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data) -{ - int res = TRUE; - ESExpResult *r; - - if (argc>0) { - if (argv[0]->type == ESEXP_RES_BOOL - && argv[0]->value.bool) - res = FALSE; - } - r = e_sexp_result_new(f, ESEXP_RES_BOOL); - r->value.bool = res; - return r; -} - -/* this should support all arguments ...? */ -static ESExpResult * -term_eval_lt(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r, *r1, *r2; - - r = e_sexp_result_new(f, ESEXP_RES_UNDEFINED); - - if (argc == 2) { - r1 = e_sexp_term_eval(f, argv[0]); - r2 = e_sexp_term_eval(f, argv[1]); - if (r1->type != r2->type) { - e_sexp_result_free(f, r1); - e_sexp_result_free(f, r2); - e_sexp_result_free(f, r); - e_sexp_fatal_error(f, "Incompatible types in compare <"); - } else if (r1->type == ESEXP_RES_INT) { - r->type = ESEXP_RES_BOOL; - r->value.bool = r1->value.number < r2->value.number; - } else if (r1->type == ESEXP_RES_STRING) { - r->type = ESEXP_RES_BOOL; - r->value.bool = strcmp(r1->value.string, r2->value.string) < 0; - } - e_sexp_result_free(f, r1); - e_sexp_result_free(f, r2); - } - return r; -} - -/* this should support all arguments ...? */ -static ESExpResult * -term_eval_gt(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r, *r1, *r2; - - r = e_sexp_result_new(f, ESEXP_RES_UNDEFINED); - - if (argc == 2) { - r1 = e_sexp_term_eval(f, argv[0]); - r2 = e_sexp_term_eval(f, argv[1]); - if (r1->type != r2->type) { - e_sexp_result_free(f, r1); - e_sexp_result_free(f, r2); - e_sexp_result_free(f, r); - e_sexp_fatal_error(f, "Incompatible types in compare >"); - } else if (r1->type == ESEXP_RES_INT) { - r->type = ESEXP_RES_BOOL; - r->value.bool = r1->value.number > r2->value.number; - } else if (r1->type == ESEXP_RES_STRING) { - r->type = ESEXP_RES_BOOL; - r->value.bool = strcmp(r1->value.string, r2->value.string) > 0; - } - e_sexp_result_free(f, r1); - e_sexp_result_free(f, r2); - } - return r; -} - -/* this should support all arguments ...? */ -static ESExpResult * -term_eval_eq(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r, *r1, *r2; - - r = e_sexp_result_new(f, ESEXP_RES_BOOL); - - if (argc == 2) { - r1 = e_sexp_term_eval(f, argv[0]); - r2 = e_sexp_term_eval(f, argv[1]); - if (r1->type != r2->type) { - r->value.bool = FALSE; - } else if (r1->type == ESEXP_RES_INT) { - r->value.bool = r1->value.number == r2->value.number; - } else if (r1->type == ESEXP_RES_BOOL) { - r->value.bool = r1->value.bool == r2->value.bool; - } else if (r1->type == ESEXP_RES_STRING) { - r->value.bool = strcmp(r1->value.string, r2->value.string) == 0; - } - e_sexp_result_free(f, r1); - e_sexp_result_free(f, r2); - } - return r; -} - -static ESExpResult * -term_eval_plus(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data) -{ - struct _ESExpResult *r=NULL; - int type; - int i; - - if (argc>0) { - type = argv[0]->type; - switch(type) { - case ESEXP_RES_INT: { - int total = argv[0]->value.number; - for (i=1;i<argc && argv[i]->type == ESEXP_RES_INT;i++) { - total += argv[i]->value.number; - } - if (i<argc) { - e_sexp_resultv_free(f, argc, argv); - e_sexp_fatal_error(f, "Invalid types in (+ ints)"); - } - r = e_sexp_result_new(f, ESEXP_RES_INT); - r->value.number = total; - break; } - case ESEXP_RES_STRING: { - GString *s = g_string_new(argv[0]->value.string); - for (i=1;i<argc && argv[i]->type == ESEXP_RES_STRING;i++) { - g_string_append(s, argv[i]->value.string); - } - if (i<argc) { - e_sexp_resultv_free(f, argc, argv); - e_sexp_fatal_error(f, "Invalid types in (+ strings)"); - } - r = e_sexp_result_new(f, ESEXP_RES_STRING); - r->value.string = s->str; - g_string_free(s, FALSE); - break; } - - } - } - - if (!r) { - r = e_sexp_result_new(f, ESEXP_RES_INT); - r->value.number = 0; - } - return r; -} - -static ESExpResult * -term_eval_sub(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data) -{ - struct _ESExpResult *r=NULL; - int type; - int i; - - if (argc>0) { - type = argv[0]->type; - switch(type) { - case ESEXP_RES_INT: { - int total = argv[0]->value.number; - for (i=1;i<argc && argv[i]->type == ESEXP_RES_INT;i++) { - total -= argv[i]->value.number; - } - if (i<argc) { - e_sexp_resultv_free(f, argc, argv); - e_sexp_fatal_error(f, "Invalid types in -"); - } - r = e_sexp_result_new(f, ESEXP_RES_INT); - r->value.number = total; - break; } - } - } - - if (!r) { - r = e_sexp_result_new(f, ESEXP_RES_INT); - r->value.number = 0; - } - return r; -} - -/* implements 'if' function */ -static ESExpResult * -term_eval_if(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r; - int doit; - - if (argc >=2 && argc<=3) { - r = e_sexp_term_eval(f, argv[0]); - doit = (r->type == ESEXP_RES_BOOL && r->value.bool); - e_sexp_result_free(f, r); - if (doit) { - return e_sexp_term_eval(f, argv[1]); - } else if (argc>2) { - return e_sexp_term_eval(f, argv[2]); - } - } - return e_sexp_result_new(f, ESEXP_RES_UNDEFINED); -} - -/* implements 'begin' statement */ -static ESExpResult * -term_eval_begin(struct _ESExp *f, int argc, struct _ESExpTerm **argv, void *data) -{ - struct _ESExpResult *r=NULL; - int i; - - for (i=0;i<argc;i++) { - if (r) - e_sexp_result_free(f, r); - r = e_sexp_term_eval(f, argv[i]); - } - if (r) - return r; - else - return e_sexp_result_new(f, ESEXP_RES_UNDEFINED); -} - - -/* this must only be called from inside term evaluation callbacks! */ -struct _ESExpResult * -e_sexp_term_eval(struct _ESExp *f, struct _ESExpTerm *t) -{ - struct _ESExpResult *r = NULL; - int i; - struct _ESExpResult **argv; - - g_return_val_if_fail(t != NULL, NULL); - - r(printf("eval term :\n")); - r(parse_dump_term(t, 0)); - - switch (t->type) { - case ESEXP_TERM_STRING: - r(printf(" (string \"%s\")\n", t->value.string)); - r = e_sexp_result_new(f, ESEXP_RES_STRING); - /* erk, this shoul;dn't need to strdup this ... */ - r->value.string = g_strdup(t->value.string); - break; - case ESEXP_TERM_INT: - r(printf(" (int %d)\n", t->value.number)); - r = e_sexp_result_new(f, ESEXP_RES_INT); - r->value.number = t->value.number; - break; - case ESEXP_TERM_BOOL: - r(printf(" (int %d)\n", t->value.number)); - r = e_sexp_result_new(f, ESEXP_RES_BOOL); - r->value.bool = t->value.bool; - break; - case ESEXP_TERM_IFUNC: - if (t->value.func.sym->f.ifunc) - r = t->value.func.sym->f.ifunc(f, t->value.func.termcount, t->value.func.terms, t->value.func.sym->data); - break; - case ESEXP_TERM_FUNC: - /* first evaluate all arguments to result types */ - argv = alloca(sizeof(argv[0]) * t->value.func.termcount); - for (i=0;i<t->value.func.termcount;i++) { - argv[i] = e_sexp_term_eval(f, t->value.func.terms[i]); - } - /* call the function */ - if (t->value.func.sym->f.func) - r = t->value.func.sym->f.func(f, t->value.func.termcount, argv, t->value.func.sym->data); - - e_sexp_resultv_free(f, t->value.func.termcount, argv); - break; - default: - e_sexp_fatal_error(f, "Unknown type in parse tree: %d", t->type); - } - - if (r==NULL) - r = e_sexp_result_new(f, ESEXP_RES_UNDEFINED); - - return r; -} - -#if 0 -static void -eval_dump_result(ESExpResult *r, int depth) -{ - int i; - - if (r==NULL) { - printf("null result???\n"); - return; - } - - for (i=0;i<depth;i++) - printf(" "); - - switch (r->type) { - case ESEXP_RES_ARRAY_PTR: - printf("array pointers\n"); - break; - case ESEXP_RES_INT: - printf("int: %d\n", r->value.number); - break; - case ESEXP_RES_STRING: - printf("string: '%s'\n", r->value.string); - break; - case ESEXP_RES_BOOL: - printf("bool: %c\n", r->value.bool?'t':'f'); - break; - case ESEXP_RES_UNDEFINED: - printf(" <undefined>\n"); - break; - } - printf("\n"); -} -#endif - -static void -parse_dump_term(struct _ESExpTerm *t, int depth) -{ - int i; - - if (t==NULL) { - printf("null term??\n"); - return; - } - - for (i=0;i<depth;i++) - printf(" "); - - switch (t->type) { - case ESEXP_TERM_STRING: - printf(" \"%s\"", t->value.string); - break; - case ESEXP_TERM_INT: - printf(" %d", t->value.number); - break; - case ESEXP_TERM_BOOL: - printf(" #%c", t->value.bool?'t':'f'); - break; - case ESEXP_TERM_IFUNC: - case ESEXP_TERM_FUNC: - printf(" (function %s\n", t->value.func.sym->name); - /*printf(" [%d] ", t->value.func.termcount);*/ - for (i=0;i<t->value.func.termcount;i++) { - parse_dump_term(t->value.func.terms[i], depth+1); - } - for (i=0;i<depth;i++) - printf(" "); - printf(" )"); - break; - case ESEXP_TERM_VAR: - printf(" (variable %s )\n", t->value.var->name); - break; - default: - printf("unknown type: %d\n", t->type); - } - - printf("\n"); -} - -/* - PARSER -*/ - -static struct _ESExpTerm * -parse_term_new(struct _ESExp *f, int type) -{ - struct _ESExpTerm *s = e_memchunk_alloc0(f->term_chunks); - s->type = type; - return s; -} - -static void -parse_term_free(struct _ESExp *f, struct _ESExpTerm *t) -{ - int i; - - if (t==NULL) { - return; - } - - switch (t->type) { - case ESEXP_TERM_FUNC: - case ESEXP_TERM_IFUNC: - for (i=0;i<t->value.func.termcount;i++) { - parse_term_free(f, t->value.func.terms[i]); - } - g_free(t->value.func.terms); - break; - case ESEXP_TERM_VAR: - break; - case ESEXP_TERM_STRING: - g_free(t->value.string); - break; - case ESEXP_TERM_INT: - break; - default: - printf("parse_term_free: unknown type: %d\n", t->type); - } - e_memchunk_free(f->term_chunks, t); -} - -static struct _ESExpTerm ** -parse_values(ESExp *f, int *len) -{ - int token; - struct _ESExpTerm **terms; - int i=0; - GScanner *gs = f->scanner; - - p(printf("parsing values\n")); - - /* FIXME: This hardcoded nonsense!!! :) */ - terms = g_malloc0(30*sizeof(*terms)); - - while ( (token = g_scanner_peek_next_token(gs)) != G_TOKEN_EOF - && token != ')') { - terms[i]=parse_value(f); - i++; - } - - p(printf("found %d subterms\n", i)); - *len = i; - - p(printf("dont parsing values\n")); - return terms; -} - -static struct _ESExpTerm * -parse_value(ESExp *f) -{ - int token; - struct _ESExpTerm *t = NULL; - GScanner *gs = f->scanner; - struct _ESExpSymbol *s; - - p(printf("parsing value\n")); - - token = g_scanner_get_next_token(gs); - switch(token) { - case G_TOKEN_LEFT_PAREN: - p(printf("got brace, its a list!\n")); - return parse_list(f, TRUE); - case G_TOKEN_STRING: - p(printf("got string\n")); - t = parse_term_new(f, ESEXP_TERM_STRING); - t->value.string = g_strdup(g_scanner_cur_value(gs).v_string); - break; - case G_TOKEN_INT: - t = parse_term_new(f, ESEXP_TERM_INT); - t->value.number = g_scanner_cur_value(gs).v_int; - p(printf("got int\n")); - break; - case '#': - p(printf("got bool?\n")); - token = g_scanner_get_next_token(gs); - t = parse_term_new(f, ESEXP_TERM_BOOL); - t->value.bool = token=='t'; - break; - case G_TOKEN_SYMBOL: - s = g_scanner_cur_value(gs).v_symbol; - switch (s->type) { - case ESEXP_TERM_FUNC: - case ESEXP_TERM_IFUNC: - /* this is basically invalid, since we can't use function - pointers, but let the runtime catch it ... */ - t = parse_term_new(f, s->type); - t->value.func.sym = s; - t->value.func.terms = parse_values(f, &t->value.func.termcount); - break; - case ESEXP_TERM_VAR: - t = parse_term_new(f, s->type); - t->value.var = s; - break; - default: - e_sexp_fatal_error(f, "Invalid symbol type: %s: %d", s->name, s->type); - } - break; - case G_TOKEN_IDENTIFIER: - e_sexp_fatal_error(f, "Unknown identifier: %s", g_scanner_cur_value(gs).v_identifier); - break; - default: - e_sexp_fatal_error(f, "Unexpected token encountered: %d", token); - } - p(printf("done parsing value\n")); - return t; -} - -/* FIXME: this needs some robustification */ -static struct _ESExpTerm * -parse_list(ESExp *f, int gotbrace) -{ - int token; - struct _ESExpTerm *t = NULL; - GScanner *gs = f->scanner; - - p(printf("parsing list\n")); - if (gotbrace) - token = '('; - else - token = g_scanner_get_next_token(gs); - if (token =='(') { - token = g_scanner_get_next_token(gs); - switch(token) { - case G_TOKEN_SYMBOL: { - struct _ESExpSymbol *s; - - s = g_scanner_cur_value(gs).v_symbol; - p(printf("got funciton: %s\n", s->name)); - t = parse_term_new(f, s->type); - p(printf("created new list %p\n", t)); - /* if we have a variable, find out its base type */ - while (s->type == ESEXP_TERM_VAR) { - s = ((ESExpTerm *)(s->data))->value.var; - } - if (s->type == ESEXP_TERM_FUNC - || s->type == ESEXP_TERM_IFUNC) { - t->value.func.sym = s; - t->value.func.terms = parse_values(f, &t->value.func.termcount); - } else { - parse_term_free(f, t); - e_sexp_fatal_error(f, "Trying to call variable as function: %s", s->name); - } - break; } - case G_TOKEN_IDENTIFIER: - e_sexp_fatal_error(f, "Unknown identifier: %s", g_scanner_cur_value(gs).v_identifier); - break; - default: - e_sexp_fatal_error(f, "Unexpected token encountered: %d", token); - } - token = g_scanner_get_next_token(gs); - if (token != ')') { - e_sexp_fatal_error(f, "Missing ')'"); - } - } else { - e_sexp_fatal_error(f, "Missing '('"); - } - - p(printf("returning list %p\n", t)); - return t; -} - -static void e_sexp_finalise(void *); - -#ifdef E_SEXP_IS_GTK_OBJECT -static void -e_sexp_class_init (ESExpClass *class) -{ - GtkObjectClass *object_class; - - object_class = (GtkObjectClass *) class; - - object_class->finalize = e_sexp_finalise; - - parent_class = gtk_type_class (gtk_object_get_type ()); -} -#endif - -/* 'builtin' functions */ -static struct { - char *name; - ESExpFunc *func; - int type; /* set to 1 if a function can perform shortcut evaluation, or - doesn't execute everything, 0 otherwise */ -} symbols[] = { - { "and", (ESExpFunc *)term_eval_and, 1 }, - { "or", (ESExpFunc *)term_eval_or, 1 }, - { "not", (ESExpFunc *)term_eval_not, 0 }, - { "<", (ESExpFunc *)term_eval_lt, 1 }, - { ">", (ESExpFunc *)term_eval_gt, 1 }, - { "=", (ESExpFunc *)term_eval_eq, 1 }, - { "+", (ESExpFunc *)term_eval_plus, 0 }, - { "-", (ESExpFunc *)term_eval_sub, 0 }, - { "if", (ESExpFunc *)term_eval_if, 1 }, - { "begin", (ESExpFunc *)term_eval_begin, 1 }, -}; - -static void -free_symbol(void *key, void *value, void *data) -{ - struct _ESExpSymbol *s = value; - - g_free(s->name); - g_free(s); -} - -static void -e_sexp_finalise(void *o) -{ - ESExp *s = (ESExp *)o; - - if (s->tree) { - parse_term_free(s, s->tree); - s->tree = NULL; - } - - e_memchunk_destroy(s->term_chunks); - e_memchunk_destroy(s->result_chunks); - - g_scanner_scope_foreach_symbol(s->scanner, 0, free_symbol, 0); - g_scanner_destroy(s->scanner); - -#ifdef E_SEXP_IS_GTK_OBJECT - ((GtkObjectClass *)(parent_class))->finalize((GtkObject *)o); -#endif -} - -static void -e_sexp_init (ESExp *s) -{ - int i; - - s->scanner = g_scanner_new(&scanner_config); - s->term_chunks = e_memchunk_new(16, sizeof(struct _ESExpTerm)); - s->result_chunks = e_memchunk_new(16, sizeof(struct _ESExpResult)); - - /* load in builtin symbols? */ - for(i=0;i<sizeof(symbols)/sizeof(symbols[0]);i++) { - if (symbols[i].type == 1) { - e_sexp_add_ifunction(s, 0, symbols[i].name, (ESExpIFunc *)symbols[i].func, &symbols[i]); - } else { - e_sexp_add_function(s, 0, symbols[i].name, symbols[i].func, &symbols[i]); - } - } - -#ifndef E_SEXP_IS_GTK_OBJECT - s->refcount = 1; -#endif -} - -#ifdef E_SEXP_IS_GTK_OBJECT -guint -e_sexp_get_type (void) -{ - static guint type = 0; - - if (!type) { - GtkTypeInfo type_info = { - "ESExp", - sizeof (ESExp), - sizeof (ESExpClass), - (GtkClassInitFunc) e_sexp_class_init, - (GtkObjectInitFunc) e_sexp_init, - (GtkArgSetFunc) NULL, - (GtkArgGetFunc) NULL - }; - - type = gtk_type_unique (gtk_object_get_type (), &type_info); - } - - return type; -} -#endif - -ESExp * -e_sexp_new (void) -{ -#ifdef E_SEXP_IS_GTK_OBJECT - ESExp *f = E_SEXP ( gtk_type_new (e_sexp_get_type ())); -#else - ESExp *f = g_malloc0(sizeof(*f)); - e_sexp_init(f); -#endif - - return f; -} - -#ifndef E_SEXP_IS_GTK_OBJECT -void e_sexp_ref (ESExp *f) -{ - f->refcount++; -} - -void e_sexp_unref (ESExp *f) -{ - f->refcount--; - if (f->refcount == 0) { - e_sexp_finalise(f); - g_free(f); - } -} -#endif - -void -e_sexp_add_function(ESExp *f, int scope, char *name, ESExpFunc *func, void *data) -{ - struct _ESExpSymbol *s; - - g_return_if_fail(FILTER_IS_SEXP(f)); - g_return_if_fail(name != NULL); - - s = g_malloc0(sizeof(*s)); - s->name = g_strdup(name); - s->f.func = func; - s->type = ESEXP_TERM_FUNC; - s->data = data; - g_scanner_scope_add_symbol(f->scanner, scope, s->name, s); -} - -void -e_sexp_add_ifunction(ESExp *f, int scope, char *name, ESExpIFunc *ifunc, void *data) -{ - struct _ESExpSymbol *s; - - g_return_if_fail(FILTER_IS_SEXP(f)); - g_return_if_fail(name != NULL); - - s = g_malloc0(sizeof(*s)); - s->name = g_strdup(name); - s->f.ifunc = ifunc; - s->type = ESEXP_TERM_IFUNC; - s->data = data; - g_scanner_scope_add_symbol(f->scanner, scope, s->name, s); -} - -void -e_sexp_add_variable(ESExp *f, int scope, char *name, ESExpTerm *value) -{ - struct _ESExpSymbol *s; - - g_return_if_fail(FILTER_IS_SEXP(f)); - g_return_if_fail(name != NULL); - - s = g_malloc0(sizeof(*s)); - s->name = g_strdup(name); - s->type = ESEXP_TERM_VAR; - s->data = value; - g_scanner_scope_add_symbol(f->scanner, scope, s->name, s); -} - -void -e_sexp_remove_symbol(ESExp *f, int scope, char *name) -{ - int oldscope; - struct _ESExpSymbol *s; - - g_return_if_fail(FILTER_IS_SEXP(f)); - g_return_if_fail(name != NULL); - - oldscope = g_scanner_set_scope(f->scanner, scope); - s = g_scanner_lookup_symbol(f->scanner, name); - g_scanner_scope_remove_symbol(f->scanner, scope, name); - g_scanner_set_scope(f->scanner, oldscope); - if (s) { - g_free(s->name); - g_free(s); - } -} - -int -e_sexp_set_scope(ESExp *f, int scope) -{ - g_return_val_if_fail(FILTER_IS_SEXP(f), 0); - - return g_scanner_set_scope(f->scanner, scope); -} - -void -e_sexp_input_text(ESExp *f, const char *text, int len) -{ - g_return_if_fail(FILTER_IS_SEXP(f)); - g_return_if_fail(text != NULL); - - g_scanner_input_text(f->scanner, text, len); -} - -void -e_sexp_input_file (ESExp *f, int fd) -{ - g_return_if_fail(FILTER_IS_SEXP(f)); - - g_scanner_input_file(f->scanner, fd); -} - -/* returns -1 on error */ -int -e_sexp_parse(ESExp *f) -{ - g_return_val_if_fail(FILTER_IS_SEXP(f), -1); - - if (setjmp(f->failenv)) { - g_warning("Error in parsing: %s", f->error); - return -1; - } - - if (f->tree) - parse_term_free(f, f->tree); - - f->tree = parse_list(f, FALSE); - - return 0; -} - -/* returns NULL on error */ -struct _ESExpResult * -e_sexp_eval(ESExp *f) -{ - g_return_val_if_fail(FILTER_IS_SEXP(f), NULL); - g_return_val_if_fail(f->tree != NULL, NULL); - - if (setjmp(f->failenv)) { - g_warning("Error in execution: %s", f->error); - return NULL; - } - - return e_sexp_term_eval(f, f->tree); -} - -/** - * e_sexp_encode_bool: - * @s: - * @state: - * - * Encode a bool into an s-expression @s. Bools are - * encoded using #t #f syntax. - **/ -void -e_sexp_encode_bool(GString *s, gboolean state) -{ - if (state) - g_string_append(s, " #t"); - else - g_string_append(s, " #f"); -} - -/** - * e_sexp_encode_string: - * @s: Destination string. - * @string: String expression. - * - * Add a c string @string to the s-expression stored in - * the gstring @s. Quotes are added, and special characters - * are escaped appropriately. - **/ -void -e_sexp_encode_string(GString *s, const char *string) -{ - char c; - const char *p; - - if (string == NULL) - p = ""; - else - p = string; - g_string_append(s, " \""); - while ( (c = *p++) ) { - if (c=='\\' || c=='\"' || c=='\'') - g_string_append_c(s, '\\'); - g_string_append_c(s, c); - } - g_string_append(s, "\""); -} - -#ifdef TESTER -int main(int argc, char **argv) -{ - ESExp *f; - char *t = "(+ \"foo\" \"\\\"\" \"bar\" \"\\\\ blah \\x \")"; - ESExpResult *r; - - gtk_init(&argc, &argv); - - f = e_sexp_new(); - - e_sexp_add_variable(f, 0, "test", NULL); - - e_sexp_input_text(f, t, strlen(t)); - e_sexp_parse(f); - - if (f->tree) { - parse_dump_term(f->tree, 0); - } - - r = e_sexp_eval(f); - if (r) { - eval_dump_result(r, 0); - } else { - printf("no result?|\n"); - } - - return 0; -} -#endif |