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bgfx/3rdparty/scintilla/lexers/LexVHDL.cxx
Branimir Karadžić a510b8f347 Added Scintilla imgui.
2015-06-08 17:07:35 -07:00

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// Scintilla source code edit control
/** @file LexVHDL.cxx
** Lexer for VHDL
** Written by Phil Reid,
** Based on:
** - The Verilog Lexer by Avi Yegudin
** - The Fortran Lexer by Chuan-jian Shen
** - The C++ lexer by Neil Hodgson
**/
// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static void ColouriseVHDLDoc(
unsigned int startPos,
int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler);
/***************************************/
static inline bool IsAWordChar(const int ch) {
return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' );
}
/***************************************/
static inline bool IsAWordStart(const int ch) {
return (ch < 0x80) && (isalnum(ch) || ch == '_');
}
/***************************************/
static inline bool IsABlank(unsigned int ch) {
return (ch == ' ') || (ch == 0x09) || (ch == 0x0b) ;
}
/***************************************/
static void ColouriseVHDLDoc(
unsigned int startPos,
int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler)
{
WordList &Keywords = *keywordlists[0];
WordList &Operators = *keywordlists[1];
WordList &Attributes = *keywordlists[2];
WordList &Functions = *keywordlists[3];
WordList &Packages = *keywordlists[4];
WordList &Types = *keywordlists[5];
WordList &User = *keywordlists[6];
StyleContext sc(startPos, length, initStyle, styler);
bool isExtendedId = false; // true when parsing an extended identifier
for (; sc.More(); sc.Forward())
{
// Determine if the current state should terminate.
if (sc.state == SCE_VHDL_OPERATOR) {
sc.SetState(SCE_VHDL_DEFAULT);
} else if (sc.state == SCE_VHDL_NUMBER) {
if (!IsAWordChar(sc.ch) && (sc.ch != '#')) {
sc.SetState(SCE_VHDL_DEFAULT);
}
} else if (sc.state == SCE_VHDL_IDENTIFIER) {
if (!isExtendedId && (!IsAWordChar(sc.ch) || (sc.ch == '.'))) {
char s[100];
sc.GetCurrentLowered(s, sizeof(s));
if (Keywords.InList(s)) {
sc.ChangeState(SCE_VHDL_KEYWORD);
} else if (Operators.InList(s)) {
sc.ChangeState(SCE_VHDL_STDOPERATOR);
} else if (Attributes.InList(s)) {
sc.ChangeState(SCE_VHDL_ATTRIBUTE);
} else if (Functions.InList(s)) {
sc.ChangeState(SCE_VHDL_STDFUNCTION);
} else if (Packages.InList(s)) {
sc.ChangeState(SCE_VHDL_STDPACKAGE);
} else if (Types.InList(s)) {
sc.ChangeState(SCE_VHDL_STDTYPE);
} else if (User.InList(s)) {
sc.ChangeState(SCE_VHDL_USERWORD);
}
sc.SetState(SCE_VHDL_DEFAULT);
} else if (isExtendedId && ((sc.ch == '\\') || sc.atLineEnd)) {
// extended identifiers are terminated by backslash, check for end of line in case we have invalid syntax
isExtendedId = false;
sc.ForwardSetState(SCE_VHDL_DEFAULT);
}
} else if (sc.state == SCE_VHDL_COMMENT || sc.state == SCE_VHDL_COMMENTLINEBANG) {
if (sc.atLineEnd) {
sc.SetState(SCE_VHDL_DEFAULT);
}
} else if (sc.state == SCE_VHDL_STRING) {
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_VHDL_DEFAULT);
} else if (sc.atLineEnd) {
sc.ChangeState(SCE_VHDL_STRINGEOL);
sc.ForwardSetState(SCE_VHDL_DEFAULT);
}
} else if (sc.state == SCE_VHDL_BLOCK_COMMENT){
if(sc.ch == '*' && sc.chNext == '/'){
sc.Forward();
sc.ForwardSetState(SCE_VHDL_DEFAULT);
}
}
// Determine if a new state should be entered.
if (sc.state == SCE_VHDL_DEFAULT) {
if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
sc.SetState(SCE_VHDL_NUMBER);
} else if (IsAWordStart(sc.ch)) {
sc.SetState(SCE_VHDL_IDENTIFIER);
} else if (sc.Match('-', '-')) {
if (sc.Match("--!")) // Nice to have a different comment style
sc.SetState(SCE_VHDL_COMMENTLINEBANG);
else
sc.SetState(SCE_VHDL_COMMENT);
} else if (sc.Match('/', '*')){
sc.SetState(SCE_VHDL_BLOCK_COMMENT);
} else if (sc.ch == '\"') {
sc.SetState(SCE_VHDL_STRING);
} else if (sc.ch == '\\') {
isExtendedId = true;
sc.SetState(SCE_VHDL_IDENTIFIER);
} else if (isoperator(static_cast<char>(sc.ch))) {
sc.SetState(SCE_VHDL_OPERATOR);
}
}
}
sc.Complete();
}
//=============================================================================
static bool IsCommentLine(int line, Accessor &styler) {
int pos = styler.LineStart(line);
int eol_pos = styler.LineStart(line + 1) - 1;
for (int i = pos; i < eol_pos; i++) {
char ch = styler[i];
char chNext = styler[i+1];
if ((ch == '-') && (chNext == '-'))
return true;
else if (ch != ' ' && ch != '\t')
return false;
}
return false;
}
static bool IsCommentBlockStart(int line, Accessor &styler)
{
int pos = styler.LineStart(line);
int eol_pos = styler.LineStart(line + 1) - 1;
for (int i = pos; i < eol_pos; i++) {
char ch = styler[i];
char chNext = styler[i+1];
char style = styler.StyleAt(i);
if ((style == SCE_VHDL_BLOCK_COMMENT) && (ch == '/') && (chNext == '*'))
return true;
}
return false;
}
static bool IsCommentBlockEnd(int line, Accessor &styler)
{
int pos = styler.LineStart(line);
int eol_pos = styler.LineStart(line + 1) - 1;
for (int i = pos; i < eol_pos; i++) {
char ch = styler[i];
char chNext = styler[i+1];
char style = styler.StyleAt(i);
if ((style == SCE_VHDL_BLOCK_COMMENT) && (ch == '*') && (chNext == '/'))
return true;
}
return false;
}
static bool IsCommentStyle(char style)
{
return style == SCE_VHDL_BLOCK_COMMENT || style == SCE_VHDL_COMMENT || style == SCE_VHDL_COMMENTLINEBANG;
}
//=============================================================================
// Folding the code
static void FoldNoBoxVHDLDoc(
unsigned int startPos,
int length,
int,
Accessor &styler)
{
// Decided it would be smarter to have the lexer have all keywords included. Therefore I
// don't check if the style for the keywords that I use to adjust the levels.
char words[] =
"architecture begin block case component else elsif end entity generate loop package process record then "
"procedure function when units";
WordList keywords;
keywords.Set(words);
bool foldComment = styler.GetPropertyInt("fold.comment", 1) != 0;
bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
bool foldAtElse = styler.GetPropertyInt("fold.at.else", 1) != 0;
bool foldAtBegin = styler.GetPropertyInt("fold.at.Begin", 1) != 0;
bool foldAtParenthese = styler.GetPropertyInt("fold.at.Parenthese", 1) != 0;
//bool foldAtWhen = styler.GetPropertyInt("fold.at.When", 1) != 0; //< fold at when in case statements
int visibleChars = 0;
unsigned int endPos = startPos + length;
int lineCurrent = styler.GetLine(startPos);
int levelCurrent = SC_FOLDLEVELBASE;
if(lineCurrent > 0)
levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
//int levelMinCurrent = levelCurrent;
int levelMinCurrentElse = levelCurrent; //< Used for folding at 'else'
int levelMinCurrentBegin = levelCurrent; //< Used for folding at 'begin'
int levelNext = levelCurrent;
/***************************************/
int lastStart = 0;
char prevWord[32] = "";
/***************************************/
// Find prev word
// The logic for going up or down a level depends on a the previous keyword
// This code could be cleaned up.
int end = 0;
unsigned int j;
for(j = startPos; j>0; j--)
{
char ch = styler.SafeGetCharAt(j);
char chPrev = styler.SafeGetCharAt(j-1);
int style = styler.StyleAt(j);
int stylePrev = styler.StyleAt(j-1);
if ((!IsCommentStyle(style)) && (stylePrev != SCE_VHDL_STRING))
{
if(IsAWordChar(chPrev) && !IsAWordChar(ch))
{
end = j-1;
}
}
if ((!IsCommentStyle(style)) && (style != SCE_VHDL_STRING))
{
if(!IsAWordChar(chPrev) && IsAWordStart(ch) && (end != 0))
{
char s[32];
unsigned int k;
for(k=0; (k<31 ) && (k<end-j+1 ); k++) {
s[k] = static_cast<char>(tolower(styler[j+k]));
}
s[k] = '\0';
if(keywords.InList(s)) {
strcpy(prevWord, s);
break;
}
}
}
}
for(j=j+static_cast<unsigned int>(strlen(prevWord)); j<endPos; j++)
{
char ch = styler.SafeGetCharAt(j);
int style = styler.StyleAt(j);
if ((!IsCommentStyle(style)) && (style != SCE_VHDL_STRING))
{
if((ch == ';') && (strcmp(prevWord, "end") == 0))
{
strcpy(prevWord, ";");
}
}
}
char chNext = styler[startPos];
char chPrev = '\0';
char chNextNonBlank;
int styleNext = styler.StyleAt(startPos);
//Platform::DebugPrintf("Line[%04d] Prev[%20s] ************************* Level[%x]\n", lineCurrent+1, prevWord, levelCurrent);
/***************************************/
for (unsigned int i = startPos; i < endPos; i++)
{
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
chPrev = styler.SafeGetCharAt(i - 1);
chNextNonBlank = chNext;
unsigned int j = i+1;
while(IsABlank(chNextNonBlank) && j<endPos)
{
j ++ ;
chNextNonBlank = styler.SafeGetCharAt(j);
}
int style = styleNext;
styleNext = styler.StyleAt(i + 1);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (foldComment && atEOL)
{
if(IsCommentLine(lineCurrent, styler))
{
if(!IsCommentLine(lineCurrent-1, styler) && IsCommentLine(lineCurrent+1, styler))
{
levelNext++;
}
else if(IsCommentLine(lineCurrent-1, styler) && !IsCommentLine(lineCurrent+1, styler))
{
levelNext--;
}
}
else
{
if (IsCommentBlockStart(lineCurrent, styler) && !IsCommentBlockEnd(lineCurrent, styler))
{
levelNext++;
}
else if (IsCommentBlockEnd(lineCurrent, styler) && !IsCommentBlockStart(lineCurrent, styler))
{
levelNext--;
}
}
}
if ((style == SCE_VHDL_OPERATOR) && foldAtParenthese)
{
if(ch == '(') {
levelNext++;
} else if (ch == ')') {
levelNext--;
}
}
if ((!IsCommentStyle(style)) && (style != SCE_VHDL_STRING))
{
if((ch == ';') && (strcmp(prevWord, "end") == 0))
{
strcpy(prevWord, ";");
}
if(!IsAWordChar(chPrev) && IsAWordStart(ch))
{
lastStart = i;
}
if(IsAWordChar(ch) && !IsAWordChar(chNext)) {
char s[32];
unsigned int k;
for(k=0; (k<31 ) && (k<i-lastStart+1 ); k++) {
s[k] = static_cast<char>(tolower(styler[lastStart+k]));
}
s[k] = '\0';
if(keywords.InList(s))
{
if (
strcmp(s, "architecture") == 0 ||
strcmp(s, "case") == 0 ||
strcmp(s, "generate") == 0 ||
strcmp(s, "block") == 0 ||
strcmp(s, "loop") == 0 ||
strcmp(s, "package") ==0 ||
strcmp(s, "process") == 0 ||
strcmp(s, "record") == 0 ||
strcmp(s, "then") == 0 ||
strcmp(s, "units") == 0)
{
if (strcmp(prevWord, "end") != 0)
{
if (levelMinCurrentElse > levelNext) {
levelMinCurrentElse = levelNext;
}
levelNext++;
}
} else if (
strcmp(s, "component") == 0 ||
strcmp(s, "entity") == 0 ||
strcmp(s, "configuration") == 0 )
{
if (strcmp(prevWord, "end") != 0 && lastStart)
{ // check for instantiated unit by backward searching for the colon.
unsigned pos = lastStart;
char chAtPos, styleAtPos;
do{// skip white spaces
pos--;
styleAtPos = styler.StyleAt(pos);
chAtPos = styler.SafeGetCharAt(pos);
}while(pos>0 &&
(chAtPos == ' ' || chAtPos == '\t' ||
chAtPos == '\n' || chAtPos == '\r' ||
IsCommentStyle(styleAtPos)));
// check for a colon (':') before the instantiated units "entity", "component" or "configuration". Don't fold thereafter.
if (chAtPos != ':')
{
if (levelMinCurrentElse > levelNext) {
levelMinCurrentElse = levelNext;
}
levelNext++;
}
}
} else if (
strcmp(s, "procedure") == 0 ||
strcmp(s, "function") == 0)
{
if (strcmp(prevWord, "end") != 0) // check for "end procedure" etc.
{ // This code checks to see if the procedure / function is a definition within a "package"
// rather than the actual code in the body.
int BracketLevel = 0;
for(int pos=i+1; pos<styler.Length(); pos++)
{
int styleAtPos = styler.StyleAt(pos);
char chAtPos = styler.SafeGetCharAt(pos);
if(chAtPos == '(') BracketLevel++;
if(chAtPos == ')') BracketLevel--;
if(
(BracketLevel == 0) &&
(!IsCommentStyle(styleAtPos)) &&
(styleAtPos != SCE_VHDL_STRING) &&
!iswordchar(styler.SafeGetCharAt(pos-1)) &&
(chAtPos|' ')=='i' && (styler.SafeGetCharAt(pos+1)|' ')=='s' &&
!iswordchar(styler.SafeGetCharAt(pos+2)))
{
if (levelMinCurrentElse > levelNext) {
levelMinCurrentElse = levelNext;
}
levelNext++;
break;
}
if((BracketLevel == 0) && (chAtPos == ';'))
{
break;
}
}
}
} else if (strcmp(s, "end") == 0) {
levelNext--;
} else if(strcmp(s, "elsif") == 0) { // elsif is followed by then so folding occurs correctly
levelNext--;
} else if (strcmp(s, "else") == 0) {
if(strcmp(prevWord, "when") != 0) // ignore a <= x when y else z;
{
levelMinCurrentElse = levelNext - 1; // VHDL else is all on its own so just dec. the min level
}
} else if(
((strcmp(s, "begin") == 0) && (strcmp(prevWord, "architecture") == 0)) ||
((strcmp(s, "begin") == 0) && (strcmp(prevWord, "function") == 0)) ||
((strcmp(s, "begin") == 0) && (strcmp(prevWord, "procedure") == 0)))
{
levelMinCurrentBegin = levelNext - 1;
}
//Platform::DebugPrintf("Line[%04d] Prev[%20s] Cur[%20s] Level[%x]\n", lineCurrent+1, prevWord, s, levelCurrent);
strcpy(prevWord, s);
}
}
}
if (atEOL) {
int levelUse = levelCurrent;
if (foldAtElse && (levelMinCurrentElse < levelUse)) {
levelUse = levelMinCurrentElse;
}
if (foldAtBegin && (levelMinCurrentBegin < levelUse)) {
levelUse = levelMinCurrentBegin;
}
int lev = levelUse | levelNext << 16;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if (levelUse < levelNext)
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(lineCurrent)) {
styler.SetLevel(lineCurrent, lev);
}
//Platform::DebugPrintf("Line[%04d] ---------------------------------------------------- Level[%x]\n", lineCurrent+1, levelCurrent);
lineCurrent++;
levelCurrent = levelNext;
//levelMinCurrent = levelCurrent;
levelMinCurrentElse = levelCurrent;
levelMinCurrentBegin = levelCurrent;
visibleChars = 0;
}
/***************************************/
if (!isspacechar(ch)) visibleChars++;
}
/***************************************/
// Platform::DebugPrintf("Line[%04d] ---------------------------------------------------- Level[%x]\n", lineCurrent+1, levelCurrent);
}
//=============================================================================
static void FoldVHDLDoc(unsigned int startPos, int length, int initStyle, WordList *[],
Accessor &styler) {
FoldNoBoxVHDLDoc(startPos, length, initStyle, styler);
}
//=============================================================================
static const char * const VHDLWordLists[] = {
"Keywords",
"Operators",
"Attributes",
"Standard Functions",
"Standard Packages",
"Standard Types",
"User Words",
0,
};
LexerModule lmVHDL(SCLEX_VHDL, ColouriseVHDLDoc, "vhdl", FoldVHDLDoc, VHDLWordLists);
// Keyword:
// access after alias all architecture array assert attribute begin block body buffer bus case component
// configuration constant disconnect downto else elsif end entity exit file for function generate generic
// group guarded if impure in inertial inout is label library linkage literal loop map new next null of
// on open others out package port postponed procedure process pure range record register reject report
// return select severity shared signal subtype then to transport type unaffected units until use variable
// wait when while with
//
// Operators:
// abs and mod nand nor not or rem rol ror sla sll sra srl xnor xor
//
// Attributes:
// left right low high ascending image value pos val succ pred leftof rightof base range reverse_range
// length delayed stable quiet transaction event active last_event last_active last_value driving
// driving_value simple_name path_name instance_name
//
// Std Functions:
// now readline read writeline write endfile resolved to_bit to_bitvector to_stdulogic to_stdlogicvector
// to_stdulogicvector to_x01 to_x01z to_UX01 rising_edge falling_edge is_x shift_left shift_right rotate_left
// rotate_right resize to_integer to_unsigned to_signed std_match to_01
//
// Std Packages:
// std ieee work standard textio std_logic_1164 std_logic_arith std_logic_misc std_logic_signed
// std_logic_textio std_logic_unsigned numeric_bit numeric_std math_complex math_real vital_primitives
// vital_timing
//
// Std Types:
// boolean bit character severity_level integer real time delay_length natural positive string bit_vector
// file_open_kind file_open_status line text side width std_ulogic std_ulogic_vector std_logic
// std_logic_vector X01 X01Z UX01 UX01Z unsigned signed
//
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