/*-
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* Copyright (c) 2012-2013 Jan Breuer,
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*
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* All Rights Reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file scpi_parser.c
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* @date Thu Nov 15 10:58:45 UTC 2012
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*
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* @brief SCPI parser implementation
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*
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*
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*/
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#include <ctype.h>
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#include <string.h>
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#include "scpi/config.h"
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#include "scpi/parser.h"
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#include "parser_private.h"
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#include "lexer_private.h"
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#include "scpi/error.h"
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#include "scpi/constants.h"
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/**
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* Write data to SCPI output
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* @param context
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* @param data
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* @param len - lenght of data to be written
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* @return number of bytes written
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*/
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static size_t writeData(scpi_t * context, const char * data, size_t len) {
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return context->interface->write(context, data, len);
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}
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/**
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* Flush data to SCPI output
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* @param context
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* @return
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*/
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static int flushData(scpi_t * context) {
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if (context && context->interface && context->interface->flush) {
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return context->interface->flush(context);
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} else {
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return SCPI_RES_OK;
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}
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}
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/**
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* Write result delimiter to output
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* @param context
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* @return number of bytes written
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*/
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static size_t writeDelimiter(scpi_t * context) {
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if (context->output_count > 0) {
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return writeData(context, ",", 2);
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} else {
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return 0;
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}
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}
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/**
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* Conditionaly write "New Line"
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* @param context
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* @return number of characters written
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*/
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static size_t writeNewLine(scpi_t * context) {
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if (context->output_count > 0) {
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size_t len;
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len = writeData(context, "\r\n", 2);
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flushData(context);
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return len;
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} else {
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return 0;
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}
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}
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/**
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* Process command
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* @param context
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*/
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static void processCommand(scpi_t * context) {
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const scpi_command_t * cmd = context->param_list.cmd;
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lex_state_t * state = &context->param_list.lex_state;
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context->cmd_error = FALSE;
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context->output_count = 0;
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context->input_count = 0;
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SCPI_DEBUG_COMMAND(context);
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/* if callback exists - call command callback */
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if (cmd->callback != NULL) {
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if ((cmd->callback(context) != SCPI_RES_OK) && !context->cmd_error) {
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SCPI_ErrorPush(context, SCPI_ERROR_EXECUTION_ERROR);
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}
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}
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/* conditionaly write new line */
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writeNewLine(context);
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/* set error if command callback did not read all parameters */
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if (state->pos < (state->buffer + state->len) && !context->cmd_error) {
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SCPI_ErrorPush(context, SCPI_ERROR_PARAMETER_NOT_ALLOWED);
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}
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}
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/**
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* Cycle all patterns and search matching pattern. Execute command callback.
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* @param context
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* @result TRUE if context->paramlist is filled with correct values
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*/
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static scpi_bool_t findCommandHeader(scpi_t * context, const char * header, int len) {
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int32_t i;
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const scpi_command_t * cmd;
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for (i = 0; context->cmdlist[i].pattern != NULL; i++) {
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cmd = &context->cmdlist[i];
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if (matchCommand(cmd->pattern, header, len)) {
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context->param_list.cmd = cmd;
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return TRUE;
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}
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}
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return FALSE;
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}
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/**
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* Parse one command line
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* @param context
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* @param data - complete command line
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* @param len - command line length
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* @return 1 if the last evaluated command was found
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*/
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int SCPI_Parse(scpi_t * context, const char * data, int len) {
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int result = 0;
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scpi_parser_state_t * state;
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int r;
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if (context == NULL) {
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return -1;
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}
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state = &context->parser_state;
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while (1) {
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result = 0;
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r = scpiParser_detectProgramMessageUnit(state, data, len);
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if (state->programHeader.type == TokInvalid) {
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_CHARACTER);
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} else if (state->programHeader.len > 0) {
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if (findCommandHeader(context, state->programHeader.ptr, state->programHeader.len)) {
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context->param_list.lex_state.buffer = state->programData.ptr;
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context->param_list.lex_state.pos = context->param_list.lex_state.buffer;
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context->param_list.lex_state.len = state->programData.len;
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context->param_list.cmd_raw.data = state->programHeader.ptr;
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context->param_list.cmd_raw.position = 0;
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context->param_list.cmd_raw.length = state->programHeader.len;
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processCommand(context);
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result = 1;
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_UNDEFINED_HEADER);
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}
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}
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if (r < len) {
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data += r;
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len -= r;
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} else {
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break;
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}
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}
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return result;
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}
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/**
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* Initialize SCPI context structure
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* @param context
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* @param command_list
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* @param buffer
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* @param interface
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*/
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void SCPI_Init(scpi_t * context) {
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if (context->idn[0] == NULL) {
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context->idn[0] = SCPI_DEFAULT_1_MANUFACTURE;
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}
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if (context->idn[1] == NULL) {
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context->idn[1] = SCPI_DEFAULT_2_MODEL;
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}
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if (context->idn[2] == NULL) {
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context->idn[2] = SCPI_DEFAULT_3;
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}
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if (context->idn[3] == NULL) {
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context->idn[3] = SCPI_DEFAULT_4_REVISION;
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}
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context->buffer.position = 0;
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SCPI_ErrorInit(context);
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}
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/**
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* Interface to the application. Adds data to system buffer and try to search
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* command line termination. If the termination is found or if len=0, command
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* parser is called.
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*
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* @param context
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* @param data - data to process
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* @param len - length of data
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* @return
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*/
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int SCPI_Input(scpi_t * context, const char * data, int len) {
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int result = 0;
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size_t totcmdlen = 0;
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int cmdlen = 0;
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if (len == 0) {
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context->buffer.data[context->buffer.position] = 0;
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result = SCPI_Parse(context, context->buffer.data, context->buffer.position);
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context->buffer.position = 0;
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} else {
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int buffer_free;
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buffer_free = context->buffer.length - context->buffer.position;
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if (len > (buffer_free - 1)) {
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return -1;
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}
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memcpy(&context->buffer.data[context->buffer.position], data, len);
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context->buffer.position += len;
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context->buffer.data[context->buffer.position] = 0;
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while (1) {
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cmdlen = scpiParser_detectProgramMessageUnit(&context->parser_state, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
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totcmdlen += cmdlen;
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if (context->parser_state.termination == PmutNewLine) break;
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if (context->parser_state.programHeader.type == TokUnknown) break;
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if (totcmdlen >= context->buffer.position) break;
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}
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if (context->parser_state.termination == PmutNewLine) {
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result = SCPI_Parse(context, context->buffer.data, totcmdlen);
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memmove(context->buffer.data, context->buffer.data + totcmdlen, context->buffer.position - totcmdlen);
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context->buffer.position -= totcmdlen;
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}
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}
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return result;
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}
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/* writing results */
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/**
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* Write raw string result to the output
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* @param context
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* @param data
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* @return
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*/
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size_t SCPI_ResultCharacters(scpi_t * context, const char * data, size_t len) {
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size_t result = 0;
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result += writeDelimiter(context);
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result += writeData(context, data, len);
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context->output_count++;
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return result;
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}
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/**
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* Write integer value to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultInt(scpi_t * context, int32_t val) {
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return SCPI_ResultIntBase(context, val, 10);
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}
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/**
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* Return prefix of nondecimal base
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* @param base
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* @return
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*/
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static const char * getBasePrefix(int8_t base) {
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switch (base) {
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case 2: return "#B";
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case 8: return "#Q";
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case 16: return "#H";
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default: return NULL;
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}
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}
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/**
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* Write integer value in specific base to the result
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* @param context
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* @param val
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* @param base
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* @return
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*/
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size_t SCPI_ResultIntBase(scpi_t * context, int32_t val, int8_t base) {
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char buffer[33];
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const char * basePrefix;
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size_t result = 0;
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size_t len;
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len = longToStr(val, buffer, sizeof (buffer), base);
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basePrefix = getBasePrefix(base);
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result += writeDelimiter(context);
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if (basePrefix != NULL) {
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result += writeData(context, basePrefix, 2);
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}
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result += writeData(context, buffer, len);
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context->output_count++;
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return result;
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}
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/**
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* Write double walue to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultDouble(scpi_t * context, double val) {
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char buffer[32];
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size_t result = 0;
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size_t len = doubleToStr(val, buffer, sizeof (buffer));
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result += writeDelimiter(context);
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result += writeData(context, buffer, len);
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context->output_count++;
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return result;
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}
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/**
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* Write string withn " to the result
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* @param context
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* @param data
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* @return
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*/
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size_t SCPI_ResultText(scpi_t * context, const char * data) {
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size_t result = 0;
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result += writeDelimiter(context);
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result += writeData(context, "\"", 1);
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// TODO: convert " to ""
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result += writeData(context, data, strlen(data));
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result += writeData(context, "\"", 1);
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context->output_count++;
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return result;
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}
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/**
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* Write boolean value to the result
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* @param context
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* @param val
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* @return
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*/
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size_t SCPI_ResultBool(scpi_t * context, scpi_bool_t val) {
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return SCPI_ResultIntBase(context, val ? 1 : 0, 10);
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}
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/* parsing parameters */
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/**
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* Get one parameter from command line
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* @param context
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* @param parameter
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_Parameter(scpi_t * context, scpi_parameter_t * parameter, scpi_bool_t mandatory) {
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scpi_token_t token;
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lex_state_t * state;
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int32_t value;
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parameter->data.ptr = NULL;
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parameter->data.len = 0;
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parameter->number.value = 0;
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parameter->number.base = 10;
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parameter->number.unit = SCPI_UNIT_NONE;
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parameter->number.type = SCPI_NUM_NUMBER;
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parameter->type = TokUnknown;
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state = &context->param_list.lex_state;
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if (state->pos >= (state->buffer + state->len)) {
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if (mandatory) {
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SCPI_ErrorPush(context, SCPI_ERROR_MISSING_PARAMETER);
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} else {
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parameter->number.type = SCPI_NUM_DEF;
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parameter->type = TokProgramMnemonic; // TODO: select something different
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}
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return FALSE;
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}
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if (context->input_count != 0) {
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scpiLex_Comma(state, &token);
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if (token.type != TokComma) {
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_SEPARATOR);
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return FALSE;
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}
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}
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context->input_count++;
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scpiParser_parseProgramData(&context->param_list.lex_state, &token);
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parameter->type = token.type;
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parameter->data.ptr = token.ptr;
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parameter->data.len = token.len;
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switch (token.type) {
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case TokHexnum:
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parameter->number.base = 16;
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strToLong(token.ptr, &value, 16);
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parameter->number.value = value;
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return TRUE;
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case TokOctnum:
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parameter->number.base = 8;
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strToLong(token.ptr, &value, 8);
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parameter->number.value = value;
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return TRUE;
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case TokBinnum:
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parameter->number.base = 2;
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strToLong(token.ptr, &value, 2);
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parameter->number.value = value;
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return TRUE;
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case TokProgramMnemonic:
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return TRUE;
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case TokDecimalNumericProgramData:
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strToDouble(token.ptr, ¶meter->number.value);
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return TRUE;
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case TokDecimalNumericProgramDataWithSuffix:
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strToDouble(token.ptr, ¶meter->number.value);
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return TRUE;
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case TokArbitraryBlockProgramData:
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return TRUE;
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case TokSingleQuoteProgramData:
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// TODO: replace double "single qoute"
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return TRUE;
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case TokDoubleQuoteProgramData:
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// TODO: replace double "double qoute"
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return TRUE;
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case TokProgramExpression:
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return TRUE;
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default:
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parameter->type = TokUnknown;
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parameter->data.ptr = NULL;
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parameter->data.len = 0;
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SCPI_ErrorPush(context, SCPI_ERROR_INVALID_STRING_DATA);
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return FALSE;
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}
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}
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/**
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* Detect if parameter is number
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* @param parameter
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* @param suffixAllowed
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* @return
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*/
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scpi_bool_t SCPI_ParamIsNumber(scpi_parameter_t * parameter, scpi_bool_t suffixAllowed) {
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switch (parameter->type) {
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case TokHexnum:
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case TokOctnum:
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case TokBinnum:
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case TokDecimalNumericProgramData:
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return TRUE;
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case TokDecimalNumericProgramDataWithSuffix:
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return suffixAllowed;
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default:
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return FALSE;
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}
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}
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/**
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* Read floating point parameter
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* @param context
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* @param value
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_ParamDouble(scpi_t * context, double * value, scpi_bool_t mandatory)
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{
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scpi_bool_t result;
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scpi_parameter_t param;
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if (!value) {
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SCPI_ErrorPush(context, SCPI_ERROR_SYSTEM_ERROR);
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return FALSE;
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}
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result = SCPI_Parameter(context, ¶m, mandatory);
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if (result) {
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if (SCPI_ParamIsNumber(¶m, FALSE)) {
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*value = param.number.value;
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} else if (SCPI_ParamIsNumber(¶m, TRUE)) {
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SCPI_ErrorPush(context, SCPI_ERROR_SUFFIX_NOT_ALLOWED);
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result = FALSE;
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_DATA_TYPE_ERROR);
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result = FALSE;
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}
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}
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return result;
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}
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/**
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* Read integer parameter
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* @param context
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* @param value
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_ParamInt(scpi_t * context, int32_t * value, scpi_bool_t mandatory)
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{
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// TODO: remove dependency on double
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double tmpVal;
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scpi_bool_t result;
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if (!value) {
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SCPI_ErrorPush(context, SCPI_ERROR_SYSTEM_ERROR);
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return FALSE;
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}
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result = SCPI_ParamDouble(context, &tmpVal, mandatory);
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if (result) {
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*value = tmpVal;
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}
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return result;
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}
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/**
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* Read character parameter
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* @param context
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* @param value
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* @param len
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_ParamCharacters(scpi_t * context, const char ** value, size_t * len, scpi_bool_t mandatory)
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{
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scpi_bool_t result;
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scpi_parameter_t param;
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if (!value || !len) {
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SCPI_ErrorPush(context, SCPI_ERROR_SYSTEM_ERROR);
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return FALSE;
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}
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result = SCPI_Parameter(context, ¶m, mandatory);
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if (result) {
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*value = param.data.ptr;
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*len = param.data.len;
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// TODO: return also parameter type (ProgramMnemonic, ArbitraryBlockProgramData, SingleQuoteProgramData, DoubleQuoteProgramData
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}
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return result;
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}
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/**
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* Read BOOL parameter (0,1,ON,OFF)
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* @param context
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* @param value
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_ParamBool(scpi_t * context, scpi_bool_t * value, scpi_bool_t mandatory)
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{
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scpi_bool_t result;
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scpi_parameter_t param;
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if (!value) {
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SCPI_ErrorPush(context, SCPI_ERROR_SYSTEM_ERROR);
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return FALSE;
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}
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result = SCPI_Parameter(context, ¶m, mandatory);
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if (result) {
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switch (param.type) {
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case TokDecimalNumericProgramData:
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*value = param.number.value ? 1 : 0;
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break;
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case TokProgramMnemonic:
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if (compareStr("ON", 2, param.data.ptr, param.data.len)) {
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*value = TRUE;
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} else if (compareStr("OFF", 3, param.data.ptr, param.data.len)) {
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*value = FALSE;
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_ILLEGAL_PARAMETER_VALUE);
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result = FALSE;
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}
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break;
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default:
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SCPI_ErrorPush(context, SCPI_ERROR_DATA_TYPE_ERROR);
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result = FALSE;
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}
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}
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return result;
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}
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/**
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* Read value from list of options
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* @param context
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* @param options
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* @param value
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* @param mandatory
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* @return
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*/
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scpi_bool_t SCPI_ParamChoice(scpi_t * context, const char * options[], int32_t * value, scpi_bool_t mandatory)
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{
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size_t res;
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scpi_bool_t result;
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scpi_parameter_t param;
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if (!options || !value) {
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SCPI_ErrorPush(context, SCPI_ERROR_SYSTEM_ERROR);
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return FALSE;
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}
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result = SCPI_Parameter(context, ¶m, mandatory);
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if (result) {
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if (param.type == TokProgramMnemonic) {
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for (res = 0; options[res]; ++res) {
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if (matchPattern(options[res], strlen(options[res]), param.data.ptr, param.data.len)) {
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*value = res;
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break;
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}
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}
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if (!options[res]) {
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SCPI_ErrorPush(context, SCPI_ERROR_ILLEGAL_PARAMETER_VALUE);
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result = FALSE;
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}
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} else {
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SCPI_ErrorPush(context, SCPI_ERROR_DATA_TYPE_ERROR);
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result = FALSE;
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}
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}
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return result;
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}
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/**
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* Parse one parameter and detect type
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* @param state
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* @param token
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* @return
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*/
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int scpiParser_parseProgramData(lex_state_t * state, scpi_token_t * token) {
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scpi_token_t tmp;
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int result = 0;
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int wsLen;
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int suffixLen;
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int realLen = 0;
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realLen += scpiLex_WhiteSpace(state, &tmp);
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if (result == 0) result = scpiLex_NondecimalNumericData(state, token);
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if (result == 0) result = scpiLex_CharacterProgramData(state, token);
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if (result == 0) {
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result = scpiLex_DecimalNumericProgramData(state, token);
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if (result != 0) {
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wsLen = scpiLex_WhiteSpace(state, &tmp);
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suffixLen = scpiLex_SuffixProgramData(state, &tmp);
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if (suffixLen > 0) {
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token->len += wsLen + suffixLen;
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token->type = TokDecimalNumericProgramDataWithSuffix;
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result = token->len;
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}
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}
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}
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if (result == 0) result = scpiLex_StringProgramData(state, token);
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if (result == 0) result = scpiLex_ArbitraryBlockProgramData(state, token);
|
if (result == 0) result = scpiLex_ProgramExpression(state, token);
|
|
realLen += scpiLex_WhiteSpace(state, &tmp);
|
|
return result + realLen;
|
}
|
|
/**
|
* Skip all parameters to correctly detect end of command line.
|
* @param state
|
* @param token
|
* @param numberOfParameters
|
* @return
|
*/
|
int scpiParser_parseAllProgramData(lex_state_t * state, scpi_token_t * token, int * numberOfParameters) {
|
|
int result;
|
scpi_token_t tmp;
|
int paramCount = 0;
|
|
token->len = -1;
|
token->type = TokAllProgramData;
|
token->ptr = state->pos;
|
|
|
for (result = 1; result != 0; result = scpiLex_Comma(state, &tmp)) {
|
token->len += result;
|
|
if (result == 0) {
|
token->type = TokUnknown;
|
token->len = 0;
|
paramCount = -1;
|
break;
|
}
|
|
result = scpiParser_parseProgramData(state, &tmp);
|
if (tmp.type != TokUnknown) {
|
token->len += result;
|
} else {
|
token->type = TokUnknown;
|
token->len = 0;
|
paramCount = -1;
|
break;
|
}
|
paramCount++;
|
}
|
|
if (token->len == -1) {
|
token->len = 0;
|
}
|
|
if (numberOfParameters != NULL) {
|
*numberOfParameters = paramCount;
|
}
|
return token->len;
|
}
|
|
static void invalidateToken(scpi_token_t * token, const char * ptr) {
|
token->len = 0;
|
token->ptr = ptr;
|
token->type = TokUnknown;
|
}
|
|
/**
|
* Skip complete command line - program header and parameters
|
* @param state
|
* @param buffer
|
* @param len
|
* @return
|
*/
|
int scpiParser_detectProgramMessageUnit(scpi_parser_state_t * state, const char * buffer, int len) {
|
lex_state_t lex_state;
|
scpi_token_t tmp;
|
int result = 0;
|
|
lex_state.buffer = lex_state.pos = buffer;
|
lex_state.len = len;
|
state->numberOfParameters = 0;
|
|
/* ignore whitespace at the begginig */
|
scpiLex_WhiteSpace(&lex_state, &tmp);
|
|
if (scpiLex_ProgramHeader(&lex_state, &state->programHeader) >= 0) {
|
if (scpiLex_WhiteSpace(&lex_state, &tmp) > 0) {
|
scpiParser_parseAllProgramData(&lex_state, &state->programData, &state->numberOfParameters);
|
} else {
|
invalidateToken(&state->programData, lex_state.pos);
|
}
|
} else {
|
invalidateToken(&state->programHeader, lex_state.buffer);
|
invalidateToken(&state->programData, lex_state.buffer);
|
}
|
|
if (result == 0) result = scpiLex_NewLine(&lex_state, &tmp);
|
if (result == 0) result = scpiLex_Semicolon(&lex_state, &tmp);
|
|
if (!scpiLex_IsEos(&lex_state) && (result == 0)) {
|
lex_state.pos++;
|
|
state->programHeader.len = 1;
|
state->programHeader.type = TokInvalid;
|
|
invalidateToken(&state->programData, lex_state.buffer);
|
}
|
|
if (TokSemicolon == tmp.type) {
|
state->termination = PmutSemicolon;
|
} else if (TokNewLine == tmp.type) {
|
state->termination = PmutNewLine;
|
} else {
|
state->termination = PmutNone;
|
}
|
|
return lex_state.pos - lex_state.buffer;
|
}
|
