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Use shell tokenization to recognize complete lines.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-09-16 16:06:24 +02:00
parent 2bed2f7ce2
commit 9d106004fa
1 changed files with 120 additions and 16 deletions
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136
sh/sh.cpp
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@ -1083,6 +1083,126 @@ bool matches_simple_pattern(const char* string, const char* pattern)
pattern + wildcard_index + 1) == 0;
}
enum sh_tokenize_result
{
SH_TOKENIZE_RESULT_OK,
SH_TOKENIZE_RESULT_PARTIAL,
SH_TOKENIZE_RESULT_INVALID,
SH_TOKENIZE_RESULT_ERROR,
};
enum sh_tokenize_result sh_tokenize(const char* command,
char*** tokens_ptr,
size_t* tokens_used_ptr,
size_t* tokens_length_ptr)
{
enum sh_tokenize_result result = SH_TOKENIZE_RESULT_OK;
char** tokens = NULL;
size_t tokens_used = 0;
size_t tokens_length = 0;
size_t command_index = 0;
while ( true )
{
if ( command[command_index] == '\0' )
break;
if ( isspace((unsigned char) command[command_index]) )
{
command_index++;
continue;
}
if ( command[command_index] == '#' )
{
while ( command[command_index] != '\0' &&
command[command_index] != '\n' )
command_index++;
continue;
}
size_t token_start = command_index;
bool escaped = false;
bool stop = false;
while ( true )
{
if ( command[command_index] == '\0' )
{
if ( escaped )
result = SH_TOKENIZE_RESULT_PARTIAL;
stop = true;
break;
}
else if ( !escaped && command[command_index] == '\\' )
{
escaped = true;
command_index++;
}
else if ( !escaped && isspace((unsigned char) command[command_index]) )
{
break;
}
else
{
command_index++;
escaped = false;
}
}
if ( tokens_used == tokens_length )
{
size_t new_length = tokens_length ? 2 * tokens_length : 16;
size_t new_size = new_length * sizeof(char*);
char** new_tokens = (char**) realloc(tokens, new_size);
if ( !new_tokens )
{
result = SH_TOKENIZE_RESULT_ERROR;
break;
}
tokens_length = new_length;
tokens = new_tokens;
}
size_t token_length = command_index - token_start;
char* token = strndup(command + token_start, token_length);
if ( !token )
{
result = SH_TOKENIZE_RESULT_ERROR;
break;
}
tokens[tokens_used++] = token;
if ( stop )
break;
}
*tokens_ptr = tokens;
*tokens_used_ptr = tokens_used;
*tokens_length_ptr = tokens_length;
return result;
}
bool is_shell_input_ready(const char* input)
{
char** tokens = NULL;
size_t tokens_used = 0;
size_t tokens_length = 0;
enum sh_tokenize_result tokenize_result =
sh_tokenize(input, &tokens, &tokens_used, &tokens_length);
bool result = tokenize_result == SH_TOKENIZE_RESULT_OK;
for ( size_t i = 0; i < tokens_used; i++ )
free(tokens[i]);
free(tokens);
return result;
}
int runcommandline(const char** tokens, bool* script_exited, bool interactive)
{
int result = 127;
@ -1436,22 +1556,6 @@ int run_command(char* command,
return status;
}
bool is_shell_input_ready(const char* input)
{
bool commented = false;
bool escaped = false;
for ( size_t i = 0; input[i]; i++ )
{
if ( !commented && !escaped && input[i] == '\\' )
escaped = true;
else if ( !commented && !escaped && input[i] == '#' )
commented = true;
else if ( !commented )
escaped = false;
}
return !escaped;
}
bool does_line_editing_need_another_line(void*, const char* line)
{
return !is_shell_input_ready(line);