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
24extern int yyparse(Expr** root, int* error_count);
25
26int 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
71int 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
160void 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
174int 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