508 lines
14 KiB
C
508 lines
14 KiB
C
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "expr.h"
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// Functions should:
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//
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// - return a malloc()'d string
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// - if Evaluate() on any argument returns NULL, return NULL.
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int BooleanString(const char* s) {
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return s[0] != '\0';
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}
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char* Evaluate(State* state, Expr* expr) {
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Value* v = expr->fn(expr->name, state, expr->argc, expr->argv);
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if (v == NULL) return NULL;
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if (v->type != VAL_STRING) {
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ErrorAbort(state, "expecting string, got value type %d", v->type);
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FreeValue(v);
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return NULL;
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}
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char* result = v->data;
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free(v);
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return result;
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}
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Value* EvaluateValue(State* state, Expr* expr) {
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return expr->fn(expr->name, state, expr->argc, expr->argv);
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}
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Value* StringValue(char* str) {
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if (str == NULL) return NULL;
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Value* v = malloc(sizeof(Value));
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v->type = VAL_STRING;
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v->size = strlen(str);
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v->data = str;
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return v;
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}
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void FreeValue(Value* v) {
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if (v == NULL) return;
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free(v->data);
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free(v);
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}
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Value* ConcatFn(const char* name, State* state, int argc, Expr* argv[]) {
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if (argc == 0) {
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return StringValue(strdup(""));
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}
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char** strings = malloc(argc * sizeof(char*));
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int i;
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for (i = 0; i < argc; ++i) {
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strings[i] = NULL;
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}
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char* result = NULL;
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int length = 0;
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for (i = 0; i < argc; ++i) {
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strings[i] = Evaluate(state, argv[i]);
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if (strings[i] == NULL) {
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goto done;
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}
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length += strlen(strings[i]);
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}
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result = malloc(length+1);
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int p = 0;
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for (i = 0; i < argc; ++i) {
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strcpy(result+p, strings[i]);
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p += strlen(strings[i]);
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}
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result[p] = '\0';
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done:
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for (i = 0; i < argc; ++i) {
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free(strings[i]);
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}
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free(strings);
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return StringValue(result);
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}
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Value* IfElseFn(const char* name, State* state, int argc, Expr* argv[]) {
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if (argc != 2 && argc != 3) {
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free(state->errmsg);
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state->errmsg = strdup("ifelse expects 2 or 3 arguments");
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return NULL;
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}
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char* cond = Evaluate(state, argv[0]);
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if (cond == NULL) {
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return NULL;
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}
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if (BooleanString(cond) == true) {
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free(cond);
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return EvaluateValue(state, argv[1]);
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} else {
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if (argc == 3) {
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free(cond);
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return EvaluateValue(state, argv[2]);
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} else {
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return StringValue(cond);
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}
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}
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}
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Value* AbortFn(const char* name, State* state, int argc, Expr* argv[]) {
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char* msg = NULL;
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if (argc > 0) {
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msg = Evaluate(state, argv[0]);
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}
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free(state->errmsg);
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if (msg) {
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state->errmsg = msg;
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} else {
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state->errmsg = strdup("called abort()");
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}
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return NULL;
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}
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Value* AssertFn(const char* name, State* state, int argc, Expr* argv[]) {
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int i;
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for (i = 0; i < argc; ++i) {
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char* v = Evaluate(state, argv[i]);
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if (v == NULL) {
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return NULL;
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}
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int b = BooleanString(v);
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free(v);
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if (!b) {
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int prefix_len;
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int len = argv[i]->end - argv[i]->start;
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char* err_src = malloc(len + 20);
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strcpy(err_src, "assert failed: ");
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prefix_len = strlen(err_src);
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memcpy(err_src + prefix_len, state->script + argv[i]->start, len);
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err_src[prefix_len + len] = '\0';
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free(state->errmsg);
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state->errmsg = err_src;
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return NULL;
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}
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}
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return StringValue(strdup(""));
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}
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Value* SleepFn(const char* name, State* state, int argc, Expr* argv[]) {
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char* val = Evaluate(state, argv[0]);
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if (val == NULL) {
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return NULL;
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}
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int v = strtol(val, NULL, 10);
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sleep(v);
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return StringValue(val);
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}
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Value* StdoutFn(const char* name, State* state, int argc, Expr* argv[]) {
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int i;
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for (i = 0; i < argc; ++i) {
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char* v = Evaluate(state, argv[i]);
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if (v == NULL) {
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return NULL;
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}
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fputs(v, stdout);
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free(v);
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}
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return StringValue(strdup(""));
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}
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Value* LogicalAndFn(const char* name, State* state,
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int argc, Expr* argv[]) {
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char* left = Evaluate(state, argv[0]);
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if (left == NULL) return NULL;
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if (BooleanString(left) == true) {
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free(left);
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return EvaluateValue(state, argv[1]);
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} else {
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return StringValue(left);
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}
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}
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Value* LogicalOrFn(const char* name, State* state,
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int argc, Expr* argv[]) {
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char* left = Evaluate(state, argv[0]);
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if (left == NULL) return NULL;
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if (BooleanString(left) == false) {
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free(left);
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return EvaluateValue(state, argv[1]);
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} else {
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return StringValue(left);
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}
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}
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Value* LogicalNotFn(const char* name, State* state,
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int argc, Expr* argv[]) {
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char* val = Evaluate(state, argv[0]);
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if (val == NULL) return NULL;
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bool bv = BooleanString(val);
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free(val);
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return StringValue(strdup(bv ? "" : "t"));
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}
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Value* SubstringFn(const char* name, State* state,
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int argc, Expr* argv[]) {
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char* needle = Evaluate(state, argv[0]);
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if (needle == NULL) return NULL;
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char* haystack = Evaluate(state, argv[1]);
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if (haystack == NULL) {
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free(needle);
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return NULL;
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}
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char* result = strdup(strstr(haystack, needle) ? "t" : "");
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free(needle);
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free(haystack);
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return StringValue(result);
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}
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Value* EqualityFn(const char* name, State* state, int argc, Expr* argv[]) {
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char* left = Evaluate(state, argv[0]);
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if (left == NULL) return NULL;
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char* right = Evaluate(state, argv[1]);
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if (right == NULL) {
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free(left);
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return NULL;
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}
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char* result = strdup(strcmp(left, right) == 0 ? "t" : "");
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free(left);
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free(right);
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return StringValue(result);
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}
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Value* InequalityFn(const char* name, State* state, int argc, Expr* argv[]) {
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char* left = Evaluate(state, argv[0]);
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if (left == NULL) return NULL;
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char* right = Evaluate(state, argv[1]);
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if (right == NULL) {
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free(left);
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return NULL;
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}
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char* result = strdup(strcmp(left, right) != 0 ? "t" : "");
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free(left);
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free(right);
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return StringValue(result);
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}
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Value* SequenceFn(const char* name, State* state, int argc, Expr* argv[]) {
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Value* left = EvaluateValue(state, argv[0]);
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if (left == NULL) return NULL;
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FreeValue(left);
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return EvaluateValue(state, argv[1]);
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}
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Value* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
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if (argc != 2) {
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free(state->errmsg);
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state->errmsg = strdup("less_than_int expects 2 arguments");
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return NULL;
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}
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char* left;
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char* right;
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if (ReadArgs(state, argv, 2, &left, &right) < 0) return NULL;
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bool result = false;
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char* end;
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long l_int = strtol(left, &end, 10);
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if (left[0] == '\0' || *end != '\0') {
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fprintf(stderr, "[%s] is not an int\n", left);
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goto done;
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}
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long r_int = strtol(right, &end, 10);
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if (right[0] == '\0' || *end != '\0') {
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fprintf(stderr, "[%s] is not an int\n", right);
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goto done;
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}
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result = l_int < r_int;
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done:
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free(left);
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free(right);
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return StringValue(strdup(result ? "t" : ""));
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}
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Value* GreaterThanIntFn(const char* name, State* state,
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int argc, Expr* argv[]) {
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if (argc != 2) {
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free(state->errmsg);
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state->errmsg = strdup("greater_than_int expects 2 arguments");
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return NULL;
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}
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Expr* temp[2];
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temp[0] = argv[1];
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temp[1] = argv[0];
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return LessThanIntFn(name, state, 2, temp);
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}
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Value* Literal(const char* name, State* state, int argc, Expr* argv[]) {
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return StringValue(strdup(name));
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}
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Expr* Build(Function fn, YYLTYPE loc, int count, ...) {
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va_list v;
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va_start(v, count);
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Expr* e = malloc(sizeof(Expr));
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e->fn = fn;
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e->name = "(operator)";
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e->argc = count;
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e->argv = malloc(count * sizeof(Expr*));
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int i;
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for (i = 0; i < count; ++i) {
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e->argv[i] = va_arg(v, Expr*);
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}
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va_end(v);
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e->start = loc.start;
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e->end = loc.end;
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return e;
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}
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// -----------------------------------------------------------------
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// the function table
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// -----------------------------------------------------------------
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static int fn_entries = 0;
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static int fn_size = 0;
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NamedFunction* fn_table = NULL;
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void RegisterFunction(const char* name, Function fn) {
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if (fn_entries >= fn_size) {
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fn_size = fn_size*2 + 1;
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fn_table = realloc(fn_table, fn_size * sizeof(NamedFunction));
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}
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fn_table[fn_entries].name = name;
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fn_table[fn_entries].fn = fn;
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++fn_entries;
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}
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static int fn_entry_compare(const void* a, const void* b) {
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const char* na = ((const NamedFunction*)a)->name;
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const char* nb = ((const NamedFunction*)b)->name;
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return strcmp(na, nb);
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}
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void FinishRegistration() {
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qsort(fn_table, fn_entries, sizeof(NamedFunction), fn_entry_compare);
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}
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Function FindFunction(const char* name) {
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NamedFunction key;
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key.name = name;
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NamedFunction* nf = bsearch(&key, fn_table, fn_entries,
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sizeof(NamedFunction), fn_entry_compare);
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if (nf == NULL) {
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return NULL;
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}
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return nf->fn;
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}
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void RegisterBuiltins() {
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RegisterFunction("ifelse", IfElseFn);
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RegisterFunction("abort", AbortFn);
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RegisterFunction("assert", AssertFn);
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RegisterFunction("concat", ConcatFn);
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RegisterFunction("is_substring", SubstringFn);
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RegisterFunction("stdout", StdoutFn);
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RegisterFunction("sleep", SleepFn);
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RegisterFunction("less_than_int", LessThanIntFn);
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RegisterFunction("greater_than_int", GreaterThanIntFn);
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}
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// -----------------------------------------------------------------
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// convenience methods for functions
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// -----------------------------------------------------------------
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// Evaluate the expressions in argv, giving 'count' char* (the ... is
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// zero or more char** to put them in). If any expression evaluates
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// to NULL, free the rest and return -1. Return 0 on success.
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int ReadArgs(State* state, Expr* argv[], int count, ...) {
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char** args = malloc(count * sizeof(char*));
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va_list v;
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va_start(v, count);
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int i;
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for (i = 0; i < count; ++i) {
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args[i] = Evaluate(state, argv[i]);
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if (args[i] == NULL) {
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va_end(v);
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int j;
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for (j = 0; j < i; ++j) {
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free(args[j]);
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}
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free(args);
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return -1;
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}
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*(va_arg(v, char**)) = args[i];
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}
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va_end(v);
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free(args);
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return 0;
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}
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// Evaluate the expressions in argv, giving 'count' Value* (the ... is
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// zero or more Value** to put them in). If any expression evaluates
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// to NULL, free the rest and return -1. Return 0 on success.
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int ReadValueArgs(State* state, Expr* argv[], int count, ...) {
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Value** args = malloc(count * sizeof(Value*));
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va_list v;
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va_start(v, count);
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int i;
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for (i = 0; i < count; ++i) {
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args[i] = EvaluateValue(state, argv[i]);
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if (args[i] == NULL) {
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va_end(v);
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int j;
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for (j = 0; j < i; ++j) {
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FreeValue(args[j]);
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}
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free(args);
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return -1;
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}
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*(va_arg(v, Value**)) = args[i];
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}
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va_end(v);
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free(args);
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return 0;
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}
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// Evaluate the expressions in argv, returning an array of char*
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// results. If any evaluate to NULL, free the rest and return NULL.
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// The caller is responsible for freeing the returned array and the
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// strings it contains.
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char** ReadVarArgs(State* state, int argc, Expr* argv[]) {
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char** args = (char**)malloc(argc * sizeof(char*));
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int i = 0;
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for (i = 0; i < argc; ++i) {
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args[i] = Evaluate(state, argv[i]);
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if (args[i] == NULL) {
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int j;
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for (j = 0; j < i; ++j) {
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free(args[j]);
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}
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free(args);
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return NULL;
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}
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}
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return args;
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}
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// Evaluate the expressions in argv, returning an array of Value*
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// results. If any evaluate to NULL, free the rest and return NULL.
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// The caller is responsible for freeing the returned array and the
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// Values it contains.
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Value** ReadValueVarArgs(State* state, int argc, Expr* argv[]) {
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Value** args = (Value**)malloc(argc * sizeof(Value*));
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int i = 0;
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for (i = 0; i < argc; ++i) {
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args[i] = EvaluateValue(state, argv[i]);
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if (args[i] == NULL) {
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int j;
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for (j = 0; j < i; ++j) {
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FreeValue(args[j]);
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}
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free(args);
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return NULL;
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}
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}
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return args;
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}
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// Use printf-style arguments to compose an error message to put into
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// *state. Returns NULL.
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Value* ErrorAbort(State* state, char* format, ...) {
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char* buffer = malloc(4096);
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va_list v;
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va_start(v, format);
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vsnprintf(buffer, 4096, format, v);
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va_end(v);
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free(state->errmsg);
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state->errmsg = buffer;
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return NULL;
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}
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