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eez-flow-template-stm32f746.../Middlewares/eez/libs/libscpi/src/lexer.c

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/*-
* BSD 2-Clause License
*
* Copyright (c) 2012-2018, Jan Breuer
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file lexer.c
* @date Wed Mar 20 19:35:19 UTC 2013
*
* @brief SCPI Lexer
*
*
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "lexer_private.h"
#include "scpi/error.h"
/**
* Is white space
* @param c
* @return
*/
static int isws(int c) {
if ((c == ' ') || (c == '\t')) {
return 1;
}
return 0;
}
/**
* Is binary digit
* @param c
* @return
*/
static int isbdigit(int c) {
if ((c == '0') || (c == '1')) {
return 1;
}
return 0;
}
/**
* Is hexadecimal digit
* @param c
* @return
*/
static int isqdigit(int c) {
if ((c == '0') || (c == '1') || (c == '2') || (c == '3') || (c == '4') || (c == '5') || (c == '6') || (c == '7')) {
return 1;
}
return 0;
}
/**
* Is end of string
* @param state
* @return
*/
static int iseos(lex_state_t * state) {
if ((state->buffer + state->len) <= (state->pos)) {
return 1;
} else {
return 0;
}
}
/**
* Private export of iseos
* @param state
* @return
*/
int scpiLex_IsEos(lex_state_t * state) {
return iseos(state);
}
/**
* Test current character
* @param state
* @param chr
* @return
*/
static int ischr(lex_state_t * state, char chr) {
return (state->pos[0] == chr);
}
/**
* Is plus or minus
* @param c
* @return
*/
static int isplusmn(int c) {
return c == '+' || c == '-';
}
/**
* Is letter H
* @param c
* @return
*/
static int isH(int c) {
return c == 'h' || c == 'H';
}
/**
* Is letter B
* @param c
* @return
*/
static int isB(int c) {
return c == 'b' || c == 'B';
}
/**
* Is letter Q
* @param c
* @return
*/
static int isQ(int c) {
return c == 'q' || c == 'Q';
}
/**
* Is letter E
* @param c
* @return
*/
static int isE(int c) {
return c == 'e' || c == 'E';
}
#define SKIP_NONE 0
#define SKIP_OK 1
#define SKIP_INCOMPLETE -1
/* skip characters */
/* 7.4.1 <PROGRAM MESSAGE UNIT SEPARATOR>*/
/* TODO: static int skipProgramMessageUnitSeparator(lex_state_t * state) */
/**
* Skip all whitespaces
* @param state
* @return
*/
static int skipWs(lex_state_t * state) {
int someSpace = 0;
while (!iseos(state) && isws(state->pos[0])) {
state->pos++;
someSpace++;
}
return someSpace;
}
/* 7.4.2 <PROGRAM DATA SEPARATOR> */
/* static int skipProgramDataSeparator(lex_state_t * state) */
/* 7.5.2 <PROGRAM MESSAGE TERMINATOR> */
/* static int skipProgramMessageTerminator(lex_state_t * state) */
/**
* Skip decimal digit
* @param state
* @return
*/
static int skipDigit(lex_state_t * state) {
if (!iseos(state) && isdigit((uint8_t)(state->pos[0]))) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/**
* Skip multiple decimal digits
* @param state
* @return
*/
static int skipNumbers(lex_state_t * state) {
int someNumbers = 0;
while (!iseos(state) && isdigit((uint8_t)(state->pos[0]))) {
state->pos++;
someNumbers++;
}
return someNumbers;
}
/**
* Skip plus or minus
* @param state
* @return
*/
static int skipPlusmn(lex_state_t * state) {
if (!iseos(state) && isplusmn(state->pos[0])) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/**
* Skip any character from 'a'-'Z'
* @param state
* @return
*/
static int skipAlpha(lex_state_t * state) {
int someLetters = 0;
while (!iseos(state) && isalpha((uint8_t)(state->pos[0]))) {
state->pos++;
someLetters++;
}
return someLetters;
}
/**
* Skip exact character chr or nothing
* @param state
* @param chr
* @return
*/
static int skipChr(lex_state_t * state, char chr) {
if (!iseos(state) && ischr(state, chr)) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/**
* Skip slash or dot
* @param state
* @return
*/
static int skipSlashDot(lex_state_t * state) {
if (!iseos(state) && (ischr(state, '/') | ischr(state, '.'))) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/**
* Skip star
* @param state
* @return
*/
static int skipStar(lex_state_t * state) {
if (!iseos(state) && ischr(state, '*')) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/**
* Skip colon
* @param state
* @return
*/
static int skipColon(lex_state_t * state) {
if (!iseos(state) && ischr(state, ':')) {
state->pos++;
return SKIP_OK;
} else {
return SKIP_NONE;
}
}
/* 7.6.1.2 <COMMAND PROGRAM HEADER> */
/**
* Skip program mnemonic [a-z][a-z0-9_]*
* @param state
* @return
*/
static int skipProgramMnemonic(lex_state_t * state) {
const char * startPos = state->pos;
if (!iseos(state) && isalpha((uint8_t)(state->pos[0]))) {
state->pos++;
while (!iseos(state) && (isalnum((uint8_t)(state->pos[0])) || ischr(state, '_'))) {
state->pos++;
}
}
if (iseos(state)) {
return (state->pos - startPos) * SKIP_INCOMPLETE;
} else {
return (state->pos - startPos) * SKIP_OK;
}
}
/* tokens */
/**
* Detect token white space
* @param state
* @param token
* @return
*/
int scpiLex_WhiteSpace(lex_state_t * state, scpi_token_t * token) {
token->ptr = state->pos;
skipWs(state);
token->len = state->pos - token->ptr;
if (token->len > 0) {
token->type = SCPI_TOKEN_WS;
} else {
token->type = SCPI_TOKEN_UNKNOWN;
}
return token->len;
}
/* 7.6.1 <COMMAND PROGRAM HEADER> */
/**
* Skip command program header \*<PROGRAM MNEMONIC>
* @param state
* @return
*/
static int skipCommonProgramHeader(lex_state_t * state) {
int res;
if (skipStar(state)) {
res = skipProgramMnemonic(state);
if (res == SKIP_NONE && iseos(state)) {
return SKIP_INCOMPLETE;
} else if (res <= SKIP_INCOMPLETE) {
return SKIP_OK;
} else if (res >= SKIP_OK) {
return SKIP_OK;
} else {
return SKIP_INCOMPLETE;
}
}
return SKIP_NONE;
}
/**
* Skip compound program header :<PROGRAM MNEMONIC>:<PROGRAM MNEMONIC>...
* @param state
* @return
*/
static int skipCompoundProgramHeader(lex_state_t * state) {
int res;
int firstColon = skipColon(state);
res = skipProgramMnemonic(state);
if (res >= SKIP_OK) {
while (skipColon(state)) {
res = skipProgramMnemonic(state);
if (res <= SKIP_INCOMPLETE) {
return SKIP_OK;
} else if (res == SKIP_NONE) {
return SKIP_INCOMPLETE;
}
}
return SKIP_OK;
} else if (res <= SKIP_INCOMPLETE) {
return SKIP_OK;
} else if (firstColon) {
return SKIP_INCOMPLETE;
} else {
return SKIP_NONE;
}
}
/**
* Detect token command or compound program header
* @param state
* @param token
* @return
*/
int scpiLex_ProgramHeader(lex_state_t * state, scpi_token_t * token) {
int res;
token->ptr = state->pos;
token->type = SCPI_TOKEN_UNKNOWN;
res = skipCommonProgramHeader(state);
if (res >= SKIP_OK) {
if (skipChr(state, '?') >= SKIP_OK) {
token->type = SCPI_TOKEN_COMMON_QUERY_PROGRAM_HEADER;
} else {
token->type = SCPI_TOKEN_COMMON_PROGRAM_HEADER;
}
} else if (res <= SKIP_INCOMPLETE) {
token->type = SCPI_TOKEN_INCOMPLETE_COMMON_PROGRAM_HEADER;
} else if (res == SKIP_NONE) {
res = skipCompoundProgramHeader(state);
if (res >= SKIP_OK) {
if (skipChr(state, '?') >= SKIP_OK) {
token->type = SCPI_TOKEN_COMPOUND_QUERY_PROGRAM_HEADER;
} else {
token->type = SCPI_TOKEN_COMPOUND_PROGRAM_HEADER;
}
} else if (res <= SKIP_INCOMPLETE) {
token->type = SCPI_TOKEN_INCOMPLETE_COMPOUND_PROGRAM_HEADER;
}
}
if (token->type != SCPI_TOKEN_UNKNOWN) {
token->len = state->pos - token->ptr;
} else {
token->len = 0;
state->pos = token->ptr;
}
return token->len;
}
/* 7.7.1 <CHARACTER PROGRAM DATA> */
/**
* Detect token "Character program data"
* @param state
* @param token
* @return
*/
int scpiLex_CharacterProgramData(lex_state_t * state, scpi_token_t * token) {
token->ptr = state->pos;
if (!iseos(state) && isalpha((uint8_t)(state->pos[0]))) {
state->pos++;
while (!iseos(state) && (isalnum((uint8_t)(state->pos[0])) || ischr(state, '_'))) {
state->pos++;
}
}
token->len = state->pos - token->ptr;
if (token->len > 0) {
token->type = SCPI_TOKEN_PROGRAM_MNEMONIC;
} else {
token->type = SCPI_TOKEN_UNKNOWN;
}
return token->len;
}
/* 7.7.2 <DECIMAL NUMERIC PROGRAM DATA> */
static int skipMantisa(lex_state_t * state) {
int someNumbers = 0;
skipPlusmn(state);
someNumbers += skipNumbers(state);
if (skipChr(state, '.')) {
someNumbers += skipNumbers(state);
}
return someNumbers;
}
static int skipExponent(lex_state_t * state) {
int someNumbers = 0;
if (!iseos(state) && isE(state->pos[0])) {
state->pos++;
skipWs(state);
skipPlusmn(state);
someNumbers = skipNumbers(state);
}
return someNumbers;
}
/**
* Detect token Decimal number
* @param state
* @param token
* @return
*/
int scpiLex_DecimalNumericProgramData(lex_state_t * state, scpi_token_t * token) {
char * rollback;
token->ptr = state->pos;
if (skipMantisa(state)) {
rollback = state->pos;
skipWs(state);
if (!skipExponent(state)) {
state->pos = rollback;
}
} else {
state->pos = token->ptr;
}
token->len = state->pos - token->ptr;
if (token->len > 0) {
token->type = SCPI_TOKEN_DECIMAL_NUMERIC_PROGRAM_DATA;
} else {
token->type = SCPI_TOKEN_UNKNOWN;
}
return token->len;
}
/* 7.7.3 <SUFFIX PROGRAM DATA> */
int scpiLex_SuffixProgramData(lex_state_t * state, scpi_token_t * token) {
token->ptr = state->pos;
skipChr(state, '/');
/* TODO: strict parsing : SLASH? (ALPHA+ (MINUS? DIGIT)?) ((SLASH | DOT) (ALPHA+ (MINUS? DIGIT)?))* */
if (skipAlpha(state)) {
skipChr(state, '-');
skipDigit(state);
while (skipSlashDot(state)) {
skipAlpha(state);
skipChr(state, '-');
skipDigit(state);
}
}
token->len = state->pos - token->ptr;
if ((token->len > 0)) {
token->type = SCPI_TOKEN_SUFFIX_PROGRAM_DATA;
} else {
token->type = SCPI_TOKEN_UNKNOWN;
state->pos = token->ptr;
token->len = 0;
}
return token->len;
}
/* 7.7.4 <NONDECIMAL NUMERIC PROGRAM DATA> */
static int skipHexNum(lex_state_t * state) {
int someNumbers = 0;
while (!iseos(state) && isxdigit((uint8_t)(state->pos[0]))) {
state->pos++;
someNumbers++;
}
return someNumbers;
}
static int skipOctNum(lex_state_t * state) {
int someNumbers = 0;
while (!iseos(state) && isqdigit(state->pos[0])) {
state->pos++;
someNumbers++;
}
return someNumbers;
}
static int skipBinNum(lex_state_t * state) {
int someNumbers = 0;
while (!iseos(state) && isbdigit(state->pos[0])) {
state->pos++;
someNumbers++;
}
return someNumbers;
}
/**
* Detect token nondecimal number
* @param state
* @param token
* @return
*/
int scpiLex_NondecimalNumericData(lex_state_t * state, scpi_token_t * token) {
int someNumbers = 0;
token->ptr = state->pos;
if (skipChr(state, '#')) {
if (!iseos(state)) {
if (isH(state->pos[0])) {
state->pos++;
someNumbers = skipHexNum(state);
token->type = SCPI_TOKEN_HEXNUM;
} else if (isQ(state->pos[0])) {
state->pos++;
someNumbers = skipOctNum(state);
token->type = SCPI_TOKEN_OCTNUM;
} else if (isB(state->pos[0])) {
state->pos++;
someNumbers = skipBinNum(state);
token->type = SCPI_TOKEN_BINNUM;
}
}
}
if (someNumbers) {
token->ptr += 2; /* ignore number prefix */
token->len = state->pos - token->ptr;
} else {
token->type = SCPI_TOKEN_UNKNOWN;
state->pos = token->ptr;
token->len = 0;
}
return token->len > 0 ? token->len + 2 : 0;
}
/* 7.7.5 <STRING PROGRAM DATA> */
static int isascii7bit(int c) {
return (c >= 0) && (c <= 0x7f);
}
static void skipQuoteProgramData(lex_state_t * state, char quote) {
while (!iseos(state)) {
if (isascii7bit(state->pos[0]) && !ischr(state, quote)) {
state->pos++;
} else if (ischr(state, quote)) {
state->pos++;
if (!iseos(state) && ischr(state, quote)) {
state->pos++;
} else {
state->pos--;
break;
}
} else {
break;
}
}
}
static void skipDoubleQuoteProgramData(lex_state_t * state) {
skipQuoteProgramData(state, '"');
}
static void skipSingleQuoteProgramData(lex_state_t * state) {
skipQuoteProgramData(state, '\'');
}
/**
* Detect token String data
* @param state
* @param token
* @return
*/
int scpiLex_StringProgramData(lex_state_t * state, scpi_token_t * token) {
token->ptr = state->pos;
if (!iseos(state)) {
if (ischr(state, '"')) {
state->pos++;
token->type = SCPI_TOKEN_DOUBLE_QUOTE_PROGRAM_DATA;
skipDoubleQuoteProgramData(state);
if (!iseos(state) && ischr(state, '"')) {
state->pos++;
token->len = state->pos - token->ptr;
} else {
state->pos = token->ptr;
}
} else if (ischr(state, '\'')) {
state->pos++;
token->type = SCPI_TOKEN_SINGLE_QUOTE_PROGRAM_DATA;
skipSingleQuoteProgramData(state);
if (!iseos(state) && ischr(state, '\'')) {
state->pos++;
token->len = state->pos - token->ptr;
} else {
state->pos = token->ptr;
}
}
}
token->len = state->pos - token->ptr;
if ((token->len > 0)) {
/* token->ptr++;
* token->len -= 2; */
} else {
token->type = SCPI_TOKEN_UNKNOWN;
state->pos = token->ptr;
token->len = 0;
}
return token->len > 0 ? token->len : 0;
}
/* 7.7.6 <ARBITRARY BLOCK PROGRAM DATA> */
static int isNonzeroDigit(int c) {
return isdigit(c) && (c != '0');
}
/**
* Detect token Block Data
* @param state
* @param token
* @return
*/
int scpiLex_ArbitraryBlockProgramData(lex_state_t * state, scpi_token_t * token) {
int i;
int arbitraryBlockLength = 0;
const char * ptr = state->pos;
int validData = -1;
token->ptr = state->pos;
if (skipChr(state, '#')) {
if (!iseos(state) && isNonzeroDigit(state->pos[0])) {
/* Get number of digits */
i = state->pos[0] - '0';
state->pos++;
for (; i > 0; i--) {
if (!iseos(state) && isdigit((uint8_t)(state->pos[0]))) {
arbitraryBlockLength *= 10;
arbitraryBlockLength += (state->pos[0] - '0');
state->pos++;
} else {
break;
}
}
if (i == 0) {
state->pos += arbitraryBlockLength;
if ((state->buffer + state->len) >= (state->pos)) {
token->ptr = state->pos - arbitraryBlockLength;
token->len = arbitraryBlockLength;
validData = 1;
} else {
validData = 0;
}
} 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;
}