/*-
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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 lexer.c
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* @date Wed Mar 20 19:35:19 UTC 2013
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*
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* @brief SCPI Lexer
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*
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*
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include "lexer_private.h"
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#include "scpi/error.h"
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/**
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* Is white space
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* @param c
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* @return
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*/
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static int isws(int c) {
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if ((c == ' ') || (c == '\t')) {
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return 1;
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}
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return 0;
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}
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/**
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* Is binary digit
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* @param c
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* @return
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*/
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static int isbdigit(int c) {
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if ((c == '0') || (c == '1')) {
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return 1;
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}
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return 0;
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}
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/**
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* Is hexadecimal digit
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* @param c
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* @return
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*/
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static int isqdigit(int c) {
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if ((c == '0') || (c == '1') || (c == '2') || (c == '3') || (c == '4') || (c == '5') || (c == '6') || (c == '7')) {
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return 1;
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}
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return 0;
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}
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/**
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* Is end of string
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* @param state
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* @return
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*/
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static int iseos(lex_state_t * state) {
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if ((state->buffer + state->len) <= (state->pos)) {
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return 1;
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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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* Private export of iseos
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* @param state
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* @return
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*/
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int scpiLex_IsEos(lex_state_t * state) {
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return iseos(state);
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}
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/**
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* Test current character
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* @param state
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* @param chr
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* @return
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*/
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static int ischr(lex_state_t * state, char chr) {
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return (state->pos[0] == chr);
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}
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/**
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* Is plus or minus
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* @param c
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* @return
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*/
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static int isplusmn(int c) {
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return c == '+' || c == '-';
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}
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/**
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* Is letter H
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* @param c
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* @return
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*/
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static int isH(int c) {
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return c == 'h' || c == 'H';
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}
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/**
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* Is letter B
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* @param c
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* @return
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*/
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static int isB(int c) {
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return c == 'b' || c == 'B';
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}
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/**
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* Is letter Q
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* @param c
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* @return
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*/
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static int isQ(int c) {
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return c == 'q' || c == 'Q';
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}
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/**
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* Is letter E
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* @param c
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* @return
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*/
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static int isE(int c) {
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return c == 'e' || c == 'E';
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}
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#define SKIP_NONE 0
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#define SKIP_OK 1
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#define SKIP_INCOMPLETE -1
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/* skip characters */
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/* 7.4.1 <PROGRAM MESSAGE UNIT SEPARATOR>*/
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// TODO: static int skipProgramMessageUnitSeparator(lex_state_t * state)
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/**
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* Skip all whitespaces
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* @param state
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* @return
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*/
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static int skipWs(lex_state_t * state) {
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int someSpace = 0;
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while (!iseos(state) && isws(state->pos[0])) {
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state->pos++;
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someSpace++;
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}
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return someSpace;
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}
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/* 7.4.2 <PROGRAM DATA SEPARATOR> */
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// static int skipProgramDataSeparator(lex_state_t * state)
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/* 7.5.2 <PROGRAM MESSAGE TERMINATOR> */
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// static int skipProgramMessageTerminator(lex_state_t * state)
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/**
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* Skip decimal digit
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* @param state
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* @return
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*/
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static int skipDigit(lex_state_t * state) {
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if (!iseos(state) && isdigit(state->pos[0])) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Skip multiple decimal digits
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* @param state
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* @return
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*/
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static int skipNumbers(lex_state_t * state) {
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int someNumbers = 0;
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while (!iseos(state) && isdigit(state->pos[0])) {
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state->pos++;
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someNumbers++;
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}
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return someNumbers;
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}
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/**
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* Skip plus or minus
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* @param state
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* @return
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*/
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static int skipPlusmn(lex_state_t * state) {
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if (!iseos(state) && isplusmn(state->pos[0])) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Skip any character from 'a'-'Z'
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* @param state
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* @return
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*/
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static int skipAlpha(lex_state_t * state) {
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int someLetters = 0;
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while (!iseos(state) && isalpha(state->pos[0])) {
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state->pos++;
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someLetters++;
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}
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return someLetters;
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}
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/**
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* Skip exact character chr or nothing
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* @param state
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* @param chr
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* @return
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*/
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static int skipChr(lex_state_t * state, char chr) {
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if (!iseos(state) && ischr(state, chr)) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Skip slash or dot
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* @param state
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* @return
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*/
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static int skipSlashDot(lex_state_t * state) {
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if (!iseos(state) && (ischr(state, '/') | ischr(state, '.'))) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Skip star
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* @param state
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* @return
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*/
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static int skipStar(lex_state_t * state) {
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if (!iseos(state) && ischr(state, '*')) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Skip colon
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* @param state
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* @return
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*/
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static int skipColon(lex_state_t * state) {
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if (!iseos(state) && ischr(state, ':')) {
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state->pos++;
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return SKIP_OK;
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} else {
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return SKIP_NONE;
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}
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}
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/* 7.6.1.2 <COMMAND PROGRAM HEADER> */
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/**
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* Skip program mnemonic [a-z][a-z0-9_]*
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* @param state
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* @return
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*/
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static int skipProgramMnemonic(lex_state_t * state) {
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const char * startPos = state->pos;
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if (!iseos(state) && isalpha(state->pos[0])) {
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state->pos++;
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while (!iseos(state) && (isalnum(state->pos[0]) || ischr(state, '_'))) {
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state->pos++;
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}
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}
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if (iseos(state)) {
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return (state->pos - startPos) * SKIP_INCOMPLETE;
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} else {
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return (state->pos - startPos) * SKIP_OK;
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}
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}
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/* tokens */
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/**
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* Detect token white space
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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 scpiLex_WhiteSpace(lex_state_t * state, scpi_token_t * token) {
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token->ptr = state->pos;
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skipWs(state);
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token->len = state->pos - token->ptr;
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if (token->len > 0) {
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token->type = SCPI_TOKEN_WS;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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}
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return token->len;
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}
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/* 7.6.1 <COMMAND PROGRAM HEADER> */
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/**
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* Skip command program header \*<PROGRAM MNEMONIC>
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* @param state
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* @return
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*/
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static int skipCommonProgramHeader(lex_state_t * state) {
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int res;
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if (skipStar(state)) {
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res = skipProgramMnemonic(state);
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if (res == SKIP_NONE && iseos(state)) {
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return SKIP_INCOMPLETE;
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} else if (res <= SKIP_INCOMPLETE) {
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return SKIP_OK;
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} else if (res >= SKIP_OK) {
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return SKIP_OK;
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} else {
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return SKIP_INCOMPLETE;
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}
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}
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return SKIP_NONE;
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}
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/**
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* Skip compound program header :<PROGRAM MNEMONIC>:<PROGRAM MNEMONIC>...
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* @param state
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* @return
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*/
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static int skipCompoundProgramHeader(lex_state_t * state) {
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int res;
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int firstColon = skipColon(state);
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res = skipProgramMnemonic(state);
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if (res >= SKIP_OK) {
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while (skipColon(state)) {
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res = skipProgramMnemonic(state);
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if (res <= SKIP_INCOMPLETE) {
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return SKIP_OK;
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} else if (res == SKIP_NONE) {
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return SKIP_INCOMPLETE;
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}
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}
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return SKIP_OK;
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} else if (res <= SKIP_INCOMPLETE) {
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return SKIP_OK;
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} else if (firstColon) {
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return SKIP_INCOMPLETE;
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} else {
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return SKIP_NONE;
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}
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}
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/**
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* Detect token command or compound program header
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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 scpiLex_ProgramHeader(lex_state_t * state, scpi_token_t * token) {
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int res;
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token->ptr = state->pos;
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token->type = SCPI_TOKEN_UNKNOWN;
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res = skipCommonProgramHeader(state);
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if (res >= SKIP_OK) {
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if (skipChr(state, '?') >= SKIP_OK) {
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token->type = SCPI_TOKEN_COMMON_QUERY_PROGRAM_HEADER;
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} else {
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token->type = SCPI_TOKEN_COMMON_PROGRAM_HEADER;
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}
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} else if (res <= SKIP_INCOMPLETE) {
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token->type = SCPI_TOKEN_INCOMPLETE_COMMON_PROGRAM_HEADER;
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} else if (res == SKIP_NONE) {
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res = skipCompoundProgramHeader(state);
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if (res >= SKIP_OK) {
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if (skipChr(state, '?') >= SKIP_OK) {
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token->type = SCPI_TOKEN_COMPOUND_QUERY_PROGRAM_HEADER;
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} else {
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token->type = SCPI_TOKEN_COMPOUND_PROGRAM_HEADER;
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}
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} else if (res <= SKIP_INCOMPLETE) {
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token->type = SCPI_TOKEN_INCOMPLETE_COMPOUND_PROGRAM_HEADER;
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}
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}
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if (token->type != SCPI_TOKEN_UNKNOWN) {
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token->len = state->pos - token->ptr;
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} else {
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token->len = 0;
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state->pos = token->ptr;
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}
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return token->len;
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}
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/* 7.7.1 <CHARACTER PROGRAM DATA> */
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/**
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* Detect token "Character program data"
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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 scpiLex_CharacterProgramData(lex_state_t * state, scpi_token_t * token) {
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token->ptr = state->pos;
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if (!iseos(state) && isalpha(state->pos[0])) {
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state->pos++;
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while (!iseos(state) && (isalnum(state->pos[0]) || ischr(state, '_'))) {
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state->pos++;
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}
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}
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token->len = state->pos - token->ptr;
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if (token->len > 0) {
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token->type = SCPI_TOKEN_PROGRAM_MNEMONIC;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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}
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return token->len;
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}
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/* 7.7.2 <DECIMAL NUMERIC PROGRAM DATA> */
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static int skipMantisa(lex_state_t * state) {
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int someNumbers = 0;
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skipPlusmn(state);
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someNumbers += skipNumbers(state);
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if (skipChr(state, '.')) {
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someNumbers += skipNumbers(state);
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}
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return someNumbers;
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}
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static int skipExponent(lex_state_t * state) {
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int someNumbers = 0;
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if (!iseos(state) && isE(state->pos[0])) {
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state->pos++;
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skipWs(state);
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skipPlusmn(state);
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someNumbers = skipNumbers(state);
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}
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return someNumbers;
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}
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/**
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* Detect token Decimal number
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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 scpiLex_DecimalNumericProgramData(lex_state_t * state, scpi_token_t * token) {
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char * rollback;
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token->ptr = state->pos;
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if (skipMantisa(state)) {
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rollback = state->pos;
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skipWs(state);
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if (!skipExponent(state)) {
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state->pos = rollback;
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}
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} else {
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state->pos = token->ptr;
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}
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token->len = state->pos - token->ptr;
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if (token->len > 0) {
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token->type = SCPI_TOKEN_DECIMAL_NUMERIC_PROGRAM_DATA;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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}
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return token->len;
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}
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/* 7.7.3 <SUFFIX PROGRAM DATA> */
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int scpiLex_SuffixProgramData(lex_state_t * state, scpi_token_t * token) {
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token->ptr = state->pos;
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skipChr(state, '/');
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// TODO: strict parsing : SLASH? (ALPHA+ (MINUS? DIGIT)?) ((SLASH | DOT) (ALPHA+ (MINUS? DIGIT)?))*
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if (skipAlpha(state)) {
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skipChr(state, '-');
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skipDigit(state);
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while (skipSlashDot(state)) {
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skipAlpha(state);
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skipChr(state, '-');
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skipDigit(state);
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}
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}
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token->len = state->pos - token->ptr;
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if ((token->len > 0)) {
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token->type = SCPI_TOKEN_SUFFIX_PROGRAM_DATA;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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state->pos = token->ptr;
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token->len = 0;
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}
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return token->len;
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}
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/* 7.7.4 <NONDECIMAL NUMERIC PROGRAM DATA> */
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static int skipHexNum(lex_state_t * state) {
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int someNumbers = 0;
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while (!iseos(state) && isxdigit(state->pos[0])) {
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state->pos++;
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someNumbers++;
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}
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return someNumbers;
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}
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static int skipOctNum(lex_state_t * state) {
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int someNumbers = 0;
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while (!iseos(state) && isqdigit(state->pos[0])) {
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state->pos++;
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someNumbers++;
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}
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return someNumbers;
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}
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static int skipBinNum(lex_state_t * state) {
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int someNumbers = 0;
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while (!iseos(state) && isbdigit(state->pos[0])) {
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state->pos++;
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someNumbers++;
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}
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return someNumbers;
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}
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/**
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* Detect token nondecimal number
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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 scpiLex_NondecimalNumericData(lex_state_t * state, scpi_token_t * token) {
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int someNumbers = 0;
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token->ptr = state->pos;
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if (skipChr(state, '#')) {
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if (!iseos(state)) {
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if (isH(state->pos[0])) {
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state->pos++;
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someNumbers = skipHexNum(state);
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token->type = SCPI_TOKEN_HEXNUM;
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} else if (isQ(state->pos[0])) {
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state->pos++;
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someNumbers = skipOctNum(state);
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token->type = SCPI_TOKEN_OCTNUM;
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} else if (isB(state->pos[0])) {
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state->pos++;
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someNumbers = skipBinNum(state);
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token->type = SCPI_TOKEN_BINNUM;
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}
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}
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}
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if (someNumbers) {
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token->ptr += 2; // ignore number prefix
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token->len = state->pos - token->ptr;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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state->pos = token->ptr;
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token->len = 0;
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}
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return token->len > 0 ? token->len + 2 : 0;
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}
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/* 7.7.5 <STRING PROGRAM DATA> */
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static int isascii7bit(int c) {
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return (c >= 0) && (c <= 0x7f);
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}
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static void skipQuoteProgramData(lex_state_t * state, char quote) {
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while (!iseos(state)) {
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if (isascii7bit(state->pos[0]) && !ischr(state, quote)) {
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state->pos++;
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} else if (ischr(state, quote)) {
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state->pos++;
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if (!iseos(state) && ischr(state, quote)) {
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state->pos++;
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} else {
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state->pos--;
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break;
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}
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} else {
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break;
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}
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}
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}
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static void skipDoubleQuoteProgramData(lex_state_t * state) {
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skipQuoteProgramData(state, '"');
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}
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static void skipSingleQuoteProgramData(lex_state_t * state) {
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skipQuoteProgramData(state, '\'');
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}
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/**
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* Detect token String data
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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 scpiLex_StringProgramData(lex_state_t * state, scpi_token_t * token) {
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token->ptr = state->pos;
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if (!iseos(state)) {
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if (ischr(state, '"')) {
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state->pos++;
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token->type = SCPI_TOKEN_DOUBLE_QUOTE_PROGRAM_DATA;
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skipDoubleQuoteProgramData(state);
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if (!iseos(state) && ischr(state, '"')) {
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state->pos++;
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token->len = state->pos - token->ptr;
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} else {
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state->pos = token->ptr;
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}
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} else if (ischr(state, '\'')) {
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state->pos++;
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token->type = SCPI_TOKEN_SINGLE_QUOTE_PROGRAM_DATA;
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skipSingleQuoteProgramData(state);
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if (!iseos(state) && ischr(state, '\'')) {
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state->pos++;
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token->len = state->pos - token->ptr;
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} else {
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state->pos = token->ptr;
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}
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}
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}
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token->len = state->pos - token->ptr;
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if ((token->len > 0)) {
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//token->ptr++;
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//token->len -= 2;
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} else {
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token->type = SCPI_TOKEN_UNKNOWN;
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state->pos = token->ptr;
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token->len = 0;
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}
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return token->len > 0 ? token->len : 0;
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}
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/* 7.7.6 <ARBITRARY BLOCK PROGRAM DATA> */
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static int isNonzeroDigit(int c) {
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return isdigit(c) && (c != '0');
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}
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/**
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* Detect token Block Data
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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 scpiLex_ArbitraryBlockProgramData(lex_state_t * state, scpi_token_t * token) {
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int i;
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int arbitraryBlockLength = 0;
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const char * ptr = state->pos;
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int validData = -1;
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token->ptr = state->pos;
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if (skipChr(state, '#')) {
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if (!iseos(state) && isNonzeroDigit(state->pos[0])) {
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/* Get number of digits */
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i = state->pos[0] - '0';
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state->pos++;
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for (; i > 0; i--) {
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if (!iseos(state) && isdigit(state->pos[0])) {
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arbitraryBlockLength *= 10;
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arbitraryBlockLength += (state->pos[0] - '0');
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state->pos++;
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} else {
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break;
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}
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}
|
|
if (i == 0) {
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state->pos += arbitraryBlockLength;
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if ((state->buffer + state->len) >= (state->pos)) {
|
token->ptr = state->pos - arbitraryBlockLength;
|
token->len = arbitraryBlockLength;
|
validData = 1;
|
}
|
} else if (iseos(state)) {
|
validData = 0;
|
}
|
} else if (iseos(state)) {
|
validData = 0;
|
}
|
}
|
|
if (validData == 1) {
|
// valid
|
token->type = SCPI_TOKEN_ARBITRARY_BLOCK_PROGRAM_DATA;
|
} else if (validData == 0) {
|
// incomplete
|
token->type = SCPI_TOKEN_UNKNOWN;
|
token->len = 0;
|
state->pos = state->buffer + state->len;
|
} else {
|
// invalid
|
token->type = SCPI_TOKEN_UNKNOWN;
|
state->pos = token->ptr;
|
token->len = 0;
|
}
|
|
return token->len + (token->ptr - ptr);
|
}
|
|
/* 7.7.7 <EXPRESSION PROGRAM DATA> */
|
static int isProgramExpression(int c) {
|
if ((c >= 0x20) && (c <= 0x7e)) {
|
if ((c != '"')
|
&& (c != '#')
|
&& (c != '\'')
|
&& (c != '(')
|
&& (c != ')')
|
&& (c != ';')) {
|
return 1;
|
}
|
}
|
|
return 0;
|
}
|
|
static void skipProgramExpression(lex_state_t * state) {
|
while (!iseos(state) && isProgramExpression(state->pos[0])) {
|
state->pos++;
|
}
|
}
|
|
// TODO: 7.7.7.2-2 recursive - any program data
|
|
/**
|
* Detect token Expression
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_ProgramExpression(lex_state_t * state, scpi_token_t * token) {
|
token->ptr = state->pos;
|
|
if (!iseos(state) && ischr(state, '(')) {
|
state->pos++;
|
skipProgramExpression(state);
|
|
if (!iseos(state) && ischr(state, ')')) {
|
state->pos++;
|
token->len = state->pos - token->ptr;
|
} else {
|
token->len = 0;
|
}
|
}
|
|
if ((token->len > 0)) {
|
token->type = SCPI_TOKEN_PROGRAM_EXPRESSION;
|
} else {
|
token->type = SCPI_TOKEN_UNKNOWN;
|
state->pos = token->ptr;
|
token->len = 0;
|
}
|
|
return token->len;
|
}
|
|
/**
|
* Detect token comma
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_Comma(lex_state_t * state, scpi_token_t * token) {
|
token->ptr = state->pos;
|
|
if (skipChr(state, ',')) {
|
token->len = 1;
|
token->type = SCPI_TOKEN_COMMA;
|
} else {
|
token->len = 0;
|
token->type = SCPI_TOKEN_UNKNOWN;
|
}
|
|
return token->len;
|
}
|
|
/**
|
* Detect token semicolon
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_Semicolon(lex_state_t * state, scpi_token_t * token) {
|
token->ptr = state->pos;
|
|
if (skipChr(state, ';')) {
|
token->len = 1;
|
token->type = SCPI_TOKEN_SEMICOLON;
|
} else {
|
token->len = 0;
|
token->type = SCPI_TOKEN_UNKNOWN;
|
}
|
|
return token->len;
|
}
|
|
/**
|
* Detect token colon
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_Colon(lex_state_t * state, scpi_token_t * token) {
|
token->ptr = state->pos;
|
|
if (skipChr(state, ':')) {
|
token->len = 1;
|
token->type = SCPI_TOKEN_COLON;
|
} else {
|
token->len = 0;
|
token->type = SCPI_TOKEN_UNKNOWN;
|
}
|
|
return token->len;
|
}
|
|
/**
|
* Detect specified character
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_SpecificCharacter(lex_state_t * state, scpi_token_t * token, char chr) {
|
token->ptr = state->pos;
|
|
if (skipChr(state, chr)) {
|
token->len = 1;
|
token->type = SCPI_TOKEN_SPECIFIC_CHARACTER;
|
} else {
|
token->len = 0;
|
token->type = SCPI_TOKEN_UNKNOWN;
|
}
|
|
return token->len;
|
}
|
|
/**
|
* Detect token New line
|
* @param state
|
* @param token
|
* @return
|
*/
|
int scpiLex_NewLine(lex_state_t * state, scpi_token_t * token) {
|
token->ptr = state->pos;
|
|
skipChr(state, '\r');
|
skipChr(state, '\n');
|
|
token->len = state->pos - token->ptr;
|
|
if ((token->len > 0)) {
|
token->type = SCPI_TOKEN_NL;
|
} else {
|
token->type = SCPI_TOKEN_UNKNOWN;
|
state->pos = token->ptr;
|
token->len = 0;
|
}
|
|
return token->len;
|
}
|
