root/lang/cplusplus/llv8call/trunk/src/util.cc @ 19856

#include <v8.h>
#include <cstring>

using namespace v8;

// Executes a string within the current v8 context.
bool Exec(Handle<String> source,
               Handle<Value> name,
               bool print_result) {
    HandleScope handle_scope;
    TryCatch try_catch;
    try_catch.SetVerbose(true);
    Handle<Script> script = Script::Compile(source, name);
    if (script.IsEmpty()) {
        // Print errors that happened during compilation.
        String::Utf8Value error(try_catch.Exception());
        printf("%s\n", *error);
        return false;
    } else {
        Handle<Value> result = script->Run();
        if (result.IsEmpty()) {
            // Print errors that happened during execution.
            String::Utf8Value error(try_catch.Exception());
            printf("%s\n", *error);
            return false;
        } else {
            if (print_result && !result->IsUndefined()) {
                // If all went well and the result wasn't undefined then print
                // the returned value.
                String::AsciiValue str(result);
                printf("%s\n", *str);
            }
            return true;
        }
    }
}

Handle<String> ReadFile(const char* name) {
    FILE* file = fopen(name, "rb");
    if (file == NULL) return Handle<String>();

    fseek(file, 0, SEEK_END);
    int size = ftell(file);
    rewind(file);

    char* chars = new char[size + 1];
    char *buffer;
    chars[size] = '\0';
    for (int i = 0; i < size;) {
        int read = fread(&chars[i], 1, size - i, file);
        i += read;
    }
    fclose(file);
    if (size>2 && chars[0] == '#' && chars[1] == '!') {
        // shebang hack
        char *end = strchr(chars, '\n');
        if (end && end-chars > 0) {
            size -= (end-chars) + 1;
            buffer = end+1;
        }
    } else {
        buffer = chars;
    }
    Handle<String> result = String::New(buffer, size);
    delete[] chars;
    return result;
}