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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <stdio.h>
     18 #include <stdlib.h>
     19 #include <string.h>
     20 
     21 #include "expr.h"
     22 #include "parser.h"
     23 
     24 extern int yyparse(Expr** root, int* error_count);
     25 
     26 int expect(const char* expr_str, const char* expected, int* errors) {
     27     Expr* e;
     28     int error;
     29     char* result;
     30 
     31     printf(".");
     32 
     33     int error_count = parse_string(expr_str, &e, &error_count);
     34     if (error > 0 || error_count > 0) {
     35         printf("error parsing \"%s\" (%d errors)\n",
     36                expr_str, error_count);
     37         ++*errors;
     38         return 0;
     39     }
     40 
     41     State state;
     42     state.cookie = NULL;
     43     state.script = strdup(expr_str);
     44     state.errmsg = NULL;
     45 
     46     result = Evaluate(&state, e);
     47     free(state.errmsg);
     48     free(state.script);
     49     if (result == NULL && expected != NULL) {
     50         printf("error evaluating \"%s\"\n", expr_str);
     51         ++*errors;
     52         return 0;
     53     }
     54 
     55     if (result == NULL && expected == NULL) {
     56         return 1;
     57     }
     58 
     59     if (strcmp(result, expected) != 0) {
     60         printf("evaluating \"%s\": expected \"%s\", got \"%s\"\n",
     61                expr_str, expected, result);
     62         ++*errors;
     63         free(result);
     64         return 0;
     65     }
     66 
     67     free(result);
     68     return 1;
     69 }
     70 
     71 int test() {
     72     int errors = 0;
     73 
     74     expect("a", "a", &errors);
     75     expect("\"a\"", "a", &errors);
     76     expect("\"\\x61\"", "a", &errors);
     77     expect("# this is a comment\n"
     78            "  a\n"
     79            "   \n",
     80            "a", &errors);
     81 
     82 
     83     // sequence operator
     84     expect("a; b; c", "c", &errors);
     85 
     86     // string concat operator
     87     expect("a + b", "ab", &errors);
     88     expect("a + \n \"b\"", "ab", &errors);
     89     expect("a + b +\nc\n", "abc", &errors);
     90 
     91     // string concat function
     92     expect("concat(a, b)", "ab", &errors);
     93     expect("concat(a,\n \"b\")", "ab", &errors);
     94     expect("concat(a + b,\nc,\"d\")", "abcd", &errors);
     95     expect("\"concat\"(a + b,\nc,\"d\")", "abcd", &errors);
     96 
     97     // logical and
     98     expect("a && b", "b", &errors);
     99     expect("a && \"\"", "", &errors);
    100     expect("\"\" && b", "", &errors);
    101     expect("\"\" && \"\"", "", &errors);
    102     expect("\"\" && abort()", "", &errors);   // test short-circuiting
    103     expect("t && abort()", NULL, &errors);
    104 
    105     // logical or
    106     expect("a || b", "a", &errors);
    107     expect("a || \"\"", "a", &errors);
    108     expect("\"\" || b", "b", &errors);
    109     expect("\"\" || \"\"", "", &errors);
    110     expect("a || abort()", "a", &errors);     // test short-circuiting
    111     expect("\"\" || abort()", NULL, &errors);
    112 
    113     // logical not
    114     expect("!a", "", &errors);
    115     expect("! \"\"", "t", &errors);
    116     expect("!!a", "t", &errors);
    117 
    118     // precedence
    119     expect("\"\" == \"\" && b", "b", &errors);
    120     expect("a + b == ab", "t", &errors);
    121     expect("ab == a + b", "t", &errors);
    122     expect("a + (b == ab)", "a", &errors);
    123     expect("(ab == a) + b", "b", &errors);
    124 
    125     // substring function
    126     expect("is_substring(cad, abracadabra)", "t", &errors);
    127     expect("is_substring(abrac, abracadabra)", "t", &errors);
    128     expect("is_substring(dabra, abracadabra)", "t", &errors);
    129     expect("is_substring(cad, abracxadabra)", "", &errors);
    130     expect("is_substring(abrac, axbracadabra)", "", &errors);
    131     expect("is_substring(dabra, abracadabrxa)", "", &errors);
    132 
    133     // ifelse function
    134     expect("ifelse(t, yes, no)", "yes", &errors);
    135     expect("ifelse(!t, yes, no)", "no", &errors);
    136     expect("ifelse(t, yes, abort())", "yes", &errors);
    137     expect("ifelse(!t, abort(), no)", "no", &errors);
    138 
    139     // if "statements"
    140     expect("if t then yes else no endif", "yes", &errors);
    141     expect("if \"\" then yes else no endif", "no", &errors);
    142     expect("if \"\" then yes endif", "", &errors);
    143     expect("if \"\"; t then yes endif", "yes", &errors);
    144 
    145     // numeric comparisons
    146     expect("less_than_int(3, 14)", "t", &errors);
    147     expect("less_than_int(14, 3)", "", &errors);
    148     expect("less_than_int(x, 3)", "", &errors);
    149     expect("less_than_int(3, x)", "", &errors);
    150     expect("greater_than_int(3, 14)", "", &errors);
    151     expect("greater_than_int(14, 3)", "t", &errors);
    152     expect("greater_than_int(x, 3)", "", &errors);
    153     expect("greater_than_int(3, x)", "", &errors);
    154 
    155     printf("\n");
    156 
    157     return errors;
    158 }
    159 
    160 void ExprDump(int depth, Expr* n, char* script) {
    161     printf("%*s", depth*2, "");
    162     char temp = script[n->end];
    163     script[n->end] = '\0';
    164     printf("%s %p (%d-%d) \"%s\"\n",
    165            n->name == NULL ? "(NULL)" : n->name, n->fn, n->start, n->end,
    166            script+n->start);
    167     script[n->end] = temp;
    168     int i;
    169     for (i = 0; i < n->argc; ++i) {
    170         ExprDump(depth+1, n->argv[i], script);
    171     }
    172 }
    173 
    174 int main(int argc, char** argv) {
    175     RegisterBuiltins();
    176     FinishRegistration();
    177 
    178     if (argc == 1) {
    179         return test() != 0;
    180     }
    181 
    182     FILE* f = fopen(argv[1], "r");
    183     if (f == NULL) {
    184         printf("%s: %s: No such file or directory\n", argv[0], argv[1]);
    185         return 1;
    186     }
    187     char buffer[8192];
    188     int size = fread(buffer, 1, 8191, f);
    189     fclose(f);
    190     buffer[size] = '\0';
    191 
    192     Expr* root;
    193     int error_count = 0;
    194     int error = parse_string(buffer, &root, &error_count);
    195     printf("parse returned %d; %d errors encountered\n", error, error_count);
    196     if (error == 0 || error_count > 0) {
    197 
    198         ExprDump(0, root, buffer);
    199 
    200         State state;
    201         state.cookie = NULL;
    202         state.script = buffer;
    203         state.errmsg = NULL;
    204 
    205         char* result = Evaluate(&state, root);
    206         if (result == NULL) {
    207             printf("result was NULL, message is: %s\n",
    208                    (state.errmsg == NULL ? "(NULL)" : state.errmsg));
    209             free(state.errmsg);
    210         } else {
    211             printf("result is [%s]\n", result);
    212         }
    213     }
    214     return 0;
    215 }
    216