forked from xxq250/Nasal-Interpreter
74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
# nasal lib io.nas
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# 2020/2/8
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# this file is used to avoid name confliction
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# and is used to avoid name undefined
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# before running this file will be translated to abstract syntax tree
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# and this ast will be linked before main ast as main-ast's beginning
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var io=
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{
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# Opens the file with the specified mode (as per ANSI fopen()) and returns a ghost object representing the filehandle.
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# Failures are thrown as runtime errors as per die().
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open:func(filename,mode="r")
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{
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return nasal_call_builtin_c_fopen(filename,mode);
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},
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# Closes the specified file as per ANSI fclose().
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close:func(filehandle)
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{
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nasal_call_builtin_c_fclose(filehandle);
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return;
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},
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# Attempts to read length bytes from the filehandle into the beginning of the mutable string buf.
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# Failures (including overruns when length > size(buf)) are thrown as runtime errors as per die().
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# Returns the number of bytes successfully read.
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read:func(filehandle,buf,length)
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{
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return nasal_call_builtin_c_read(filehandle,buf,length);
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},
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# Attempts to write the entirety of the specified string to the filehandle.
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# Failures are thrown as runtime errors as per die().
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# Returns the number of bytes successfully written.
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write:func(filehandle,str)
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{
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return nasal_call_builtin_c_write(filehandle,str);
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},
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# As ANSI fseek().
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# Attempts to seek to the specified position based on the whence value
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# (which must be one of io.SEEK_SET,io.SEEK_END, or io.SEEK_CUR)
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SEEK_SET:1,
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SEEK_CUR:2,
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SEEK_END:3,
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seek:func(filehandle,position,whence)
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{
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nasal_call_builtin_c_seek(filehandle,position,whence);
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return;
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},
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# Returns the current seek position of the filehandle.
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tell:func(filehandle)
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{
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return nasal_call_builtin_c_tell(filehandle);
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},
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# Reads and returns a single text line from the filehandle.
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# Interprets both "\n" and "\r\n" as end of line markers,
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# and does not include the "\r" or "\n" bytes in the returned string.
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# End offile or error is signaled by returning nil.
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readln:func(filehandle)
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{
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return nasal_call_builtin_builtin_c_getline(filehandle);
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},
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# Calls unix or win32 stat() on the specified file name and
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# returns a seven element array whose contents are,
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# in order: dev, ino, mode,nlink, uid, gid, rdef, size, atime, mtime, ctime.
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# Errors are signaled as exceptions as per die().
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stat:func(filename)
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{
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return nasal_call_builtin_builtin_stat(filename);
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},
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};
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var print=func(dyn...)
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{
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nasal_call_builtin_c_std_puts(dyn);
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return nil;
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}; |