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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     yy_scan_string(expr_str);
     34     int error_count = 0;
     35     error = yyparse(&e, &error_count);
     36     if (error > 0 || error_count > 0) {
     37         fprintf(stderr, "error parsing \"%s\" (%d errors)\n",
     38                 expr_str, error_count);
     39         ++*errors;
     40         return 0;
     41     }
     42 
     43     State state;
     44     state.cookie = NULL;
     45     state.script = strdup(expr_str);
     46     state.errmsg = NULL;
     47 
     48     result = Evaluate(&state, e);
     49     free(state.errmsg);
     50     free(state.script);
     51     if (result == NULL && expected != NULL) {
     52         fprintf(stderr, "error evaluating \"%s\"\n", expr_str);
     53         ++*errors;
     54         return 0;
     55     }
     56 
     57     if (result == NULL && expected == NULL) {
     58         return 1;
     59     }
     60 
     61     if (strcmp(result, expected) != 0) {
     62         fprintf(stderr, "evaluating \"%s\": expected \"%s\", got \"%s\"\n",
     63                 expr_str, expected, result);
     64         ++*errors;
     65         free(result);
     66         return 0;
     67     }
     68 
     69     free(result);
     70     return 1;
     71 }
     72 
     73 int test() {
     74     int errors = 0;
     75 
     76     expect("a", "a", &errors);
     77     expect("\"a\"", "a", &errors);
     78     expect("\"\\x61\"", "a", &errors);
     79     expect("# this is a comment\n"
     80            "  a\n"
     81            "   \n",
     82            "a", &errors);
     83 
     84 
     85     // sequence operator
     86     expect("a; b; c", "c", &errors);
     87 
     88     // string concat operator
     89     expect("a + b", "ab", &errors);
     90     expect("a + \n \"b\"", "ab", &errors);
     91     expect("a + b +\nc\n", "abc", &errors);
     92 
     93     // string concat function
     94     expect("concat(a, b)", "ab", &errors);
     95     expect("concat(a,\n \"b\")", "ab", &errors);
     96     expect("concat(a + b,\nc,\"d\")", "abcd", &errors);
     97     expect("\"concat\"(a + b,\nc,\"d\")", "abcd", &errors);
     98 
     99     // logical and
    100     expect("a && b", "b", &errors);
    101     expect("a && \"\"", "", &errors);
    102     expect("\"\" && b", "", &errors);
    103     expect("\"\" && \"\"", "", &errors);
    104     expect("\"\" && abort()", "", &errors);   // test short-circuiting
    105     expect("t && abort()", NULL, &errors);
    106 
    107     // logical or
    108     expect("a || b", "a", &errors);
    109     expect("a || \"\"", "a", &errors);
    110     expect("\"\" || b", "b", &errors);
    111     expect("\"\" || \"\"", "", &errors);
    112     expect("a || abort()", "a", &errors);     // test short-circuiting
    113     expect("\"\" || abort()", NULL, &errors);
    114 
    115     // logical not
    116     expect("!a", "", &errors);
    117     expect("! \"\"", "t", &errors);
    118     expect("!!a", "t", &errors);
    119 
    120     // precedence
    121     expect("\"\" == \"\" && b", "b", &errors);
    122     expect("a + b == ab", "t", &errors);
    123     expect("ab == a + b", "t", &errors);
    124     expect("a + (b == ab)", "a", &errors);
    125     expect("(ab == a) + b", "b", &errors);
    126 
    127     // substring function
    128     expect("is_substring(cad, abracadabra)", "t", &errors);
    129     expect("is_substring(abrac, abracadabra)", "t", &errors);
    130     expect("is_substring(dabra, abracadabra)", "t", &errors);
    131     expect("is_substring(cad, abracxadabra)", "", &errors);
    132     expect("is_substring(abrac, axbracadabra)", "", &errors);
    133     expect("is_substring(dabra, abracadabrxa)", "", &errors);
    134 
    135     // ifelse function
    136     expect("ifelse(t, yes, no)", "yes", &errors);
    137     expect("ifelse(!t, yes, no)", "no", &errors);
    138     expect("ifelse(t, yes, abort())", "yes", &errors);
    139     expect("ifelse(!t, abort(), no)", "no", &errors);
    140 
    141     // if "statements"
    142     expect("if t then yes else no endif", "yes", &errors);
    143     expect("if \"\" then yes else no endif", "no", &errors);
    144     expect("if \"\" then yes endif", "", &errors);
    145     expect("if \"\"; t then yes endif", "yes", &errors);
    146 
    147     // numeric comparisons
    148     expect("less_than_int(3, 14)", "t", &errors);
    149     expect("less_than_int(14, 3)", "", &errors);
    150     expect("less_than_int(x, 3)", "", &errors);
    151     expect("less_than_int(3, x)", "", &errors);
    152     expect("greater_than_int(3, 14)", "", &errors);
    153     expect("greater_than_int(14, 3)", "t", &errors);
    154     expect("greater_than_int(x, 3)", "", &errors);
    155     expect("greater_than_int(3, x)", "", &errors);
    156 
    157     printf("\n");
    158 
    159     return errors;
    160 }
    161 
    162 void ExprDump(int depth, Expr* n, char* script) {
    163     printf("%*s", depth*2, "");
    164     char temp = script[n->end];
    165     script[n->end] = '\0';
    166     printf("%s %p (%d-%d) \"%s\"\n",
    167            n->name == NULL ? "(NULL)" : n->name, n->fn, n->start, n->end,
    168            script+n->start);
    169     script[n->end] = temp;
    170     int i;
    171     for (i = 0; i < n->argc; ++i) {
    172         ExprDump(depth+1, n->argv[i], script);
    173     }
    174 }
    175 
    176 int main(int argc, char** argv) {
    177     RegisterBuiltins();
    178     FinishRegistration();
    179 
    180     if (argc == 1) {
    181         return test() != 0;
    182     }
    183 
    184     FILE* f = fopen(argv[1], "r");
    185     if (f == NULL) {
    186         printf("%s: %s: No such file or directory\n", argv[0], argv[1]);
    187         return 1;
    188     }
    189     char buffer[8192];
    190     int size = fread(buffer, 1, 8191, f);
    191     fclose(f);
    192     buffer[size] = '\0';
    193 
    194     Expr* root;
    195     int error_count = 0;
    196     yy_scan_bytes(buffer, size);
    197     int error = yyparse(&root, &error_count);
    198     printf("parse returned %d; %d errors encountered\n", error, error_count);
    199     if (error == 0 || error_count > 0) {
    200 
    201         ExprDump(0, root, buffer);
    202 
    203         State state;
    204         state.cookie = NULL;
    205         state.script = buffer;
    206         state.errmsg = NULL;
    207 
    208         char* result = Evaluate(&state, root);
    209         if (result == NULL) {
    210             printf("result was NULL, message is: %s\n",
    211                    (state.errmsg == NULL ? "(NULL)" : state.errmsg));
    212             free(state.errmsg);
    213         } else {
    214             printf("result is [%s]\n", result);
    215         }
    216     }
    217     return 0;
    218 }
    219