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notepad-plus-plus/lexilla/lexers/LexNimrod.cxx

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// Scintilla source code edit control
// Nimrod lexer
// (c) 2009 Andreas Rumpf
/** @file LexNimrod.cxx
** Lexer for Nimrod.
** This lexer has been superceded by the "nim" lexer in LexNim.cxx.
**/
// 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 <string>
#include <string_view>
#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"
using namespace Lexilla;
static inline bool IsAWordChar(int ch) {
return (ch >= 0x80) || isalnum(ch) || ch == '_';
}
static Sci_Position tillEndOfTripleQuote(Accessor &styler, Sci_Position pos, Sci_Position max) {
/* search for """ */
for (;;) {
if (styler.SafeGetCharAt(pos, '\0') == '\0') return pos;
if (pos >= max) return pos;
if (styler.Match(pos, "\"\"\"")) {
return pos + 2;
}
pos++;
}
}
#define CR 13 /* use both because Scite allows changing the line ending */
#define LF 10
static bool inline isNewLine(int ch) {
return ch == CR || ch == LF;
}
static Sci_Position scanString(Accessor &styler, Sci_Position pos, Sci_Position max, bool rawMode) {
for (;;) {
if (pos >= max) return pos;
char ch = styler.SafeGetCharAt(pos, '\0');
if (ch == CR || ch == LF || ch == '\0') return pos;
if (ch == '"') return pos;
if (ch == '\\' && !rawMode) {
pos += 2;
} else {
pos++;
}
}
}
static Sci_Position scanChar(Accessor &styler, Sci_Position pos, Sci_Position max) {
for (;;) {
if (pos >= max) return pos;
char ch = styler.SafeGetCharAt(pos, '\0');
if (ch == CR || ch == LF || ch == '\0') return pos;
if (ch == '\'' && !isalnum(styler.SafeGetCharAt(pos+1, '\0')) )
return pos;
if (ch == '\\') {
pos += 2;
} else {
pos++;
}
}
}
static Sci_Position scanIdent(Accessor &styler, Sci_Position pos, WordList &keywords) {
char buf[100]; /* copy to lowercase and ignore underscores */
Sci_Position i = 0;
for (;;) {
char ch = styler.SafeGetCharAt(pos, '\0');
if (!IsAWordChar(ch)) break;
if (ch != '_' && i < ((int)sizeof(buf))-1) {
buf[i] = static_cast<char>(tolower(ch));
i++;
}
pos++;
}
buf[i] = '\0';
/* look for keyword */
if (keywords.InList(buf)) {
styler.ColourTo(pos-1, SCE_P_WORD);
} else {
styler.ColourTo(pos-1, SCE_P_IDENTIFIER);
}
return pos;
}
static Sci_Position scanNumber(Accessor &styler, Sci_Position pos) {
char ch, ch2;
ch = styler.SafeGetCharAt(pos, '\0');
ch2 = styler.SafeGetCharAt(pos+1, '\0');
if (ch == '0' && (ch2 == 'b' || ch2 == 'B')) {
/* binary number: */
pos += 2;
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '1')) ++pos;
else break;
}
} else if (ch == '0' &&
(ch2 == 'o' || ch2 == 'O' || ch2 == 'c' || ch2 == 'C')) {
/* octal number: */
pos += 2;
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '7')) ++pos;
else break;
}
} else if (ch == '0' && (ch2 == 'x' || ch2 == 'X')) {
/* hexadecimal number: */
pos += 2;
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '9')
|| (ch >= 'a' && ch <= 'f')
|| (ch >= 'A' && ch <= 'F')) ++pos;
else break;
}
} else {
// skip decimal part:
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '9')) ++pos;
else break;
}
ch2 = styler.SafeGetCharAt(pos+1, '\0');
if (ch == '.' && ch2 >= '0' && ch2 <= '9') {
++pos; // skip '.'
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '9')) ++pos;
else break;
}
}
if (ch == 'e' || ch == 'E') {
++pos;
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '-' || ch == '+') ++pos;
for (;;) {
ch = styler.SafeGetCharAt(pos, '\0');
if (ch == '_' || (ch >= '0' && ch <= '9')) ++pos;
else break;
}
}
}
if (ch == '\'') {
/* a type suffix: */
pos++;
for (;;) {
ch = styler.SafeGetCharAt(pos);
if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z')
|| (ch >= 'a' && ch <= 'z') || ch == '_') ++pos;
else break;
}
}
styler.ColourTo(pos-1, SCE_P_NUMBER);
return pos;
}
/* rewritten from scratch, because I couldn't get rid of the bugs...
(A character based approach sucks!)
*/
static void ColouriseNimrodDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
WordList *keywordlists[], Accessor &styler) {
Sci_Position pos = startPos;
Sci_Position max = startPos + length;
char ch;
WordList &keywords = *keywordlists[0];
styler.StartAt(startPos);
styler.StartSegment(startPos);
switch (initStyle) {
/* check where we are: */
case SCE_P_TRIPLEDOUBLE:
pos = tillEndOfTripleQuote(styler, pos, max);
styler.ColourTo(pos, SCE_P_TRIPLEDOUBLE);
pos++;
break;
default: /* nothing to do: */
break;
}
while (pos < max) {
ch = styler.SafeGetCharAt(pos, '\0');
switch (ch) {
case '\0': return;
case '#': {
bool doccomment = (styler.SafeGetCharAt(pos+1) == '#');
while (pos < max && !isNewLine(styler.SafeGetCharAt(pos, LF))) pos++;
if (doccomment)
styler.ColourTo(pos, SCE_C_COMMENTLINEDOC);
else
styler.ColourTo(pos, SCE_P_COMMENTLINE);
} break;
case 'r': case 'R': {
if (styler.SafeGetCharAt(pos+1) == '"') {
pos = scanString(styler, pos+2, max, true);
styler.ColourTo(pos, SCE_P_STRING);
pos++;
} else {
pos = scanIdent(styler, pos, keywords);
}
} break;
case '"':
if (styler.Match(pos+1, "\"\"")) {
pos = tillEndOfTripleQuote(styler, pos+3, max);
styler.ColourTo(pos, SCE_P_TRIPLEDOUBLE);
} else {
pos = scanString(styler, pos+1, max, false);
styler.ColourTo(pos, SCE_P_STRING);
}
pos++;
break;
case '\'':
pos = scanChar(styler, pos+1, max);
styler.ColourTo(pos, SCE_P_CHARACTER);
pos++;
break;
default: // identifers, numbers, operators, whitespace
if (ch >= '0' && ch <= '9') {
pos = scanNumber(styler, pos);
} else if (IsAWordChar(ch)) {
pos = scanIdent(styler, pos, keywords);
} else if (ch == '`') {
pos++;
while (pos < max) {
ch = styler.SafeGetCharAt(pos, LF);
if (ch == '`') {
++pos;
break;
}
if (ch == CR || ch == LF) break;
++pos;
}
styler.ColourTo(pos, SCE_P_IDENTIFIER);
} else if (strchr("()[]{}:=;-\\/&%$!+<>|^?,.*~@", ch)) {
styler.ColourTo(pos, SCE_P_OPERATOR);
pos++;
} else {
styler.ColourTo(pos, SCE_P_DEFAULT);
pos++;
}
break;
}
}
}
static bool IsCommentLine(Sci_Position line, Accessor &styler) {
Sci_Position pos = styler.LineStart(line);
Sci_Position eol_pos = styler.LineStart(line + 1) - 1;
for (Sci_Position i = pos; i < eol_pos; i++) {
char ch = styler[i];
if (ch == '#')
return true;
else if (ch != ' ' && ch != '\t')
return false;
}
return false;
}
static bool IsQuoteLine(Sci_Position line, Accessor &styler) {
int style = styler.StyleAt(styler.LineStart(line)) & 31;
return ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
}
static void FoldNimrodDoc(Sci_PositionU startPos, Sci_Position length,
int /*initStyle - unused*/,
WordList *[], Accessor &styler) {
const Sci_Position maxPos = startPos + length;
const Sci_Position maxLines = styler.GetLine(maxPos - 1); // Requested last line
const Sci_Position docLines = styler.GetLine(styler.Length() - 1); // Available last line
const bool foldComment = styler.GetPropertyInt("fold.comment.nimrod") != 0;
const bool foldQuotes = styler.GetPropertyInt("fold.quotes.nimrod") != 0;
// Backtrack to previous non-blank line so we can determine indent level
// for any white space lines (needed esp. within triple quoted strings)
// and so we can fix any preceding fold level (which is why we go back
// at least one line in all cases)
int spaceFlags = 0;
Sci_Position lineCurrent = styler.GetLine(startPos);
int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
while (lineCurrent > 0) {
lineCurrent--;
indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG) &&
(!IsCommentLine(lineCurrent, styler)) &&
(!IsQuoteLine(lineCurrent, styler)))
break;
}
int indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
// Set up initial loop state
startPos = styler.LineStart(lineCurrent);
int prev_state = SCE_P_DEFAULT & 31;
if (lineCurrent >= 1)
prev_state = styler.StyleAt(startPos - 1) & 31;
int prevQuote = foldQuotes && ((prev_state == SCE_P_TRIPLE) ||
(prev_state == SCE_P_TRIPLEDOUBLE));
int prevComment = 0;
if (lineCurrent >= 1)
prevComment = foldComment && IsCommentLine(lineCurrent - 1, styler);
// Process all characters to end of requested range or end of any triple quote
// or comment that hangs over the end of the range. Cap processing in all cases
// to end of document (in case of unclosed quote or comment at end).
while ((lineCurrent <= docLines) && ((lineCurrent <= maxLines) ||
prevQuote || prevComment)) {
// Gather info
int lev = indentCurrent;
Sci_Position lineNext = lineCurrent + 1;
int indentNext = indentCurrent;
int quote = false;
if (lineNext <= docLines) {
// Information about next line is only available if not at end of document
indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
int style = styler.StyleAt(styler.LineStart(lineNext)) & 31;
quote = foldQuotes && ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
}
const int quote_start = (quote && !prevQuote);
const int quote_continue = (quote && prevQuote);
const int comment = foldComment && IsCommentLine(lineCurrent, styler);
const int comment_start = (comment && !prevComment && (lineNext <= docLines) &&
IsCommentLine(lineNext, styler) &&
(lev > SC_FOLDLEVELBASE));
const int comment_continue = (comment && prevComment);
if ((!quote || !prevQuote) && !comment)
indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
if (quote)
indentNext = indentCurrentLevel;
if (indentNext & SC_FOLDLEVELWHITEFLAG)
indentNext = SC_FOLDLEVELWHITEFLAG | indentCurrentLevel;
if (quote_start) {
// Place fold point at start of triple quoted string
lev |= SC_FOLDLEVELHEADERFLAG;
} else if (quote_continue || prevQuote) {
// Add level to rest of lines in the string
lev = lev + 1;
} else if (comment_start) {
// Place fold point at start of a block of comments
lev |= SC_FOLDLEVELHEADERFLAG;
} else if (comment_continue) {
// Add level to rest of lines in the block
lev = lev + 1;
}
// Skip past any blank lines for next indent level info; we skip also
// comments (all comments, not just those starting in column 0)
// which effectively folds them into surrounding code rather
// than screwing up folding.
while (!quote &&
(lineNext < docLines) &&
((indentNext & SC_FOLDLEVELWHITEFLAG) ||
(lineNext <= docLines && IsCommentLine(lineNext, styler)))) {
lineNext++;
indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
}
const int levelAfterComments = indentNext & SC_FOLDLEVELNUMBERMASK;
const int levelBeforeComments =
Maximum(indentCurrentLevel,levelAfterComments);
// Now set all the indent levels on the lines we skipped
// Do this from end to start. Once we encounter one line
// which is indented more than the line after the end of
// the comment-block, use the level of the block before
Sci_Position skipLine = lineNext;
int skipLevel = levelAfterComments;
while (--skipLine > lineCurrent) {
int skipLineIndent = styler.IndentAmount(skipLine, &spaceFlags, NULL);
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
skipLevel = levelBeforeComments;
int whiteFlag = skipLineIndent & SC_FOLDLEVELWHITEFLAG;
styler.SetLevel(skipLine, skipLevel | whiteFlag);
}
// Set fold header on non-quote/non-comment line
if (!quote && !comment && !(indentCurrent & SC_FOLDLEVELWHITEFLAG) ) {
if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) <
(indentNext & SC_FOLDLEVELNUMBERMASK))
lev |= SC_FOLDLEVELHEADERFLAG;
}
// Keep track of triple quote and block comment state of previous line
prevQuote = quote;
prevComment = comment_start || comment_continue;
// Set fold level for this line and move to next line
styler.SetLevel(lineCurrent, lev);
indentCurrent = indentNext;
lineCurrent = lineNext;
}
// NOTE: Cannot set level of last line here because indentCurrent doesn't have
// header flag set; the loop above is crafted to take care of this case!
//styler.SetLevel(lineCurrent, indentCurrent);
}
static const char * const nimrodWordListDesc[] = {
"Keywords",
0
};
LexerModule lmNimrod(SCLEX_NIMROD, ColouriseNimrodDoc, "nimrod", FoldNimrodDoc,
nimrodWordListDesc);