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

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// Scintilla source code edit control
/** @file LexCoffeeScript.cxx
** Lexer for CoffeeScript.
**/
// Copyright 1998-2011 by Neil Hodgson <neilh@scintilla.org>
// Based on the Scintilla C++ Lexer
// Written by Eric Promislow <ericp@activestate.com> in 2011 for the Komodo IDE
// 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 <algorithm>
#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 bool IsSpaceEquiv(int state) {
return (state == SCE_COFFEESCRIPT_DEFAULT
|| state == SCE_COFFEESCRIPT_COMMENTLINE
|| state == SCE_COFFEESCRIPT_COMMENTBLOCK
|| state == SCE_COFFEESCRIPT_VERBOSE_REGEX
|| state == SCE_COFFEESCRIPT_VERBOSE_REGEX_COMMENT
|| state == SCE_COFFEESCRIPT_WORD
|| state == SCE_COFFEESCRIPT_REGEX);
}
// Store the current lexer state and brace count prior to starting a new
// `#{}` interpolation level.
// Based on LexRuby.cxx.
static void enterInnerExpression(int *p_inner_string_types,
int *p_inner_expn_brace_counts,
int& inner_string_count,
int state,
int& brace_counts
) {
p_inner_string_types[inner_string_count] = state;
p_inner_expn_brace_counts[inner_string_count] = brace_counts;
brace_counts = 0;
++inner_string_count;
}
// Restore the lexer state and brace count for the previous `#{}` interpolation
// level upon returning to it.
// Note the previous lexer state is the return value and needs to be restored
// manually by the StyleContext.
// Based on LexRuby.cxx.
static int exitInnerExpression(int *p_inner_string_types,
int *p_inner_expn_brace_counts,
int& inner_string_count,
int& brace_counts
) {
--inner_string_count;
brace_counts = p_inner_expn_brace_counts[inner_string_count];
return p_inner_string_types[inner_string_count];
}
// Preconditions: sc.currentPos points to a character after '+' or '-'.
// The test for pos reaching 0 should be redundant,
// and is in only for safety measures.
// Limitation: this code will give the incorrect answer for code like
// a = b+++/ptn/...
// Putting a space between the '++' post-inc operator and the '+' binary op
// fixes this, and is highly recommended for readability anyway.
static bool FollowsPostfixOperator(StyleContext &sc, Accessor &styler) {
Sci_Position pos = (Sci_Position) sc.currentPos;
while (--pos > 0) {
char ch = styler[pos];
if (ch == '+' || ch == '-') {
return styler[pos - 1] == ch;
}
}
return false;
}
static bool followsKeyword(StyleContext &sc, Accessor &styler) {
Sci_Position pos = (Sci_Position) sc.currentPos;
Sci_Position currentLine = styler.GetLine(pos);
Sci_Position lineStartPos = styler.LineStart(currentLine);
while (--pos > lineStartPos) {
char ch = styler.SafeGetCharAt(pos);
if (ch != ' ' && ch != '\t') {
break;
}
}
styler.Flush();
return styler.StyleAt(pos) == SCE_COFFEESCRIPT_WORD;
}
static void ColouriseCoffeeScriptDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
Accessor &styler) {
WordList &keywords = *keywordlists[0];
WordList &keywords2 = *keywordlists[1];
WordList &keywords4 = *keywordlists[3];
CharacterSet setOKBeforeRE(CharacterSet::setNone, "([{=,:;!%^&*|?~+-");
CharacterSet setCouldBePostOp(CharacterSet::setNone, "+-");
CharacterSet setWordStart(CharacterSet::setAlpha, "_$@", 0x80, true);
CharacterSet setWord(CharacterSet::setAlphaNum, "._$", 0x80, true);
int chPrevNonWhite = ' ';
int visibleChars = 0;
// String/Regex interpolation variables, based on LexRuby.cxx.
// In most cases a value of 2 should be ample for the code the user is
// likely to enter. For example,
// "Filling the #{container} with #{liquid}..."
// from the CoffeeScript homepage nests to a level of 2
// If the user actually hits a 6th occurrence of '#{' in a double-quoted
// string (including regexes), it will stay as a string. The problem with
// this is that quotes might flip, a 7th '#{' will look like a comment,
// and code-folding might be wrong.
#define INNER_STRINGS_MAX_COUNT 5
// These vars track our instances of "...#{,,,'..#{,,,}...',,,}..."
int inner_string_types[INNER_STRINGS_MAX_COUNT];
// Track # braces when we push a new #{ thing
int inner_expn_brace_counts[INNER_STRINGS_MAX_COUNT];
int inner_string_count = 0;
int brace_counts = 0; // Number of #{ ... } things within an expression
for (int i = 0; i < INNER_STRINGS_MAX_COUNT; i++) {
inner_string_types[i] = 0;
inner_expn_brace_counts[i] = 0;
}
// look back to set chPrevNonWhite properly for better regex colouring
Sci_Position endPos = startPos + length;
if (startPos > 0 && IsSpaceEquiv(initStyle)) {
Sci_PositionU back = startPos;
styler.Flush();
while (back > 0 && IsSpaceEquiv(styler.StyleAt(--back)))
;
if (styler.StyleAt(back) == SCE_COFFEESCRIPT_OPERATOR) {
chPrevNonWhite = styler.SafeGetCharAt(back);
}
if (startPos != back) {
initStyle = styler.StyleAt(back);
if (IsSpaceEquiv(initStyle)) {
initStyle = SCE_COFFEESCRIPT_DEFAULT;
}
}
startPos = back;
}
StyleContext sc(startPos, endPos - startPos, initStyle, styler);
for (; sc.More();) {
if (sc.atLineStart) {
// Reset states to beginning of colourise so no surprises
// if different sets of lines lexed.
visibleChars = 0;
}
// Determine if the current state should terminate.
switch (sc.state) {
case SCE_COFFEESCRIPT_OPERATOR:
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
break;
case SCE_COFFEESCRIPT_NUMBER:
// We accept almost anything because of hex. and number suffixes
if (!setWord.Contains(sc.ch) || sc.Match('.', '.')) {
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_IDENTIFIER:
if (!setWord.Contains(sc.ch) || (sc.ch == '.') || (sc.ch == '$')) {
char s[1000];
sc.GetCurrent(s, sizeof(s));
if (keywords.InList(s)) {
sc.ChangeState(SCE_COFFEESCRIPT_WORD);
} else if (keywords2.InList(s)) {
sc.ChangeState(SCE_COFFEESCRIPT_WORD2);
} else if (keywords4.InList(s)) {
sc.ChangeState(SCE_COFFEESCRIPT_GLOBALCLASS);
} else if (sc.LengthCurrent() > 0 && s[0] == '@') {
sc.ChangeState(SCE_COFFEESCRIPT_INSTANCEPROPERTY);
}
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_WORD:
case SCE_COFFEESCRIPT_WORD2:
case SCE_COFFEESCRIPT_GLOBALCLASS:
case SCE_COFFEESCRIPT_INSTANCEPROPERTY:
if (!setWord.Contains(sc.ch)) {
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_COMMENTLINE:
if (sc.atLineStart) {
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_STRING:
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_COFFEESCRIPT_DEFAULT);
} else if (sc.ch == '#' && sc.chNext == '{' && inner_string_count < INNER_STRINGS_MAX_COUNT) {
// process interpolated code #{ ... }
enterInnerExpression(inner_string_types,
inner_expn_brace_counts,
inner_string_count,
sc.state,
brace_counts);
sc.SetState(SCE_COFFEESCRIPT_OPERATOR);
sc.ForwardSetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_CHARACTER:
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\'') {
sc.ForwardSetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_REGEX:
if (sc.atLineStart) {
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
} else if (sc.ch == '/') {
sc.Forward();
while ((sc.ch < 0x80) && islower(sc.ch))
sc.Forward(); // gobble regex flags
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
} else if (sc.ch == '\\') {
// Gobble up the quoted character
if (sc.chNext == '\\' || sc.chNext == '/') {
sc.Forward();
}
}
break;
case SCE_COFFEESCRIPT_STRINGEOL:
if (sc.atLineStart) {
sc.SetState(SCE_COFFEESCRIPT_DEFAULT);
}
break;
case SCE_COFFEESCRIPT_COMMENTBLOCK:
if (sc.Match("###")) {
sc.Forward();
sc.Forward();
sc.ForwardSetState(SCE_COFFEESCRIPT_DEFAULT);
} else if (sc.ch == '\\') {
sc.Forward();
}
break;
case SCE_COFFEESCRIPT_VERBOSE_REGEX:
if (sc.Match("///")) {
sc.Forward();
sc.Forward();
sc.ForwardSetState(SCE_COFFEESCRIPT_DEFAULT);
} else if (sc.Match('#')) {
sc.SetState(SCE_COFFEESCRIPT_VERBOSE_REGEX_COMMENT);
} else if (sc.ch == '\\') {
sc.Forward();
}
break;
case SCE_COFFEESCRIPT_VERBOSE_REGEX_COMMENT:
if (sc.atLineStart) {
sc.SetState(SCE_COFFEESCRIPT_VERBOSE_REGEX);
}
break;
}
// Determine if a new state should be entered.
if (sc.state == SCE_COFFEESCRIPT_DEFAULT) {
if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
sc.SetState(SCE_COFFEESCRIPT_NUMBER);
} else if (setWordStart.Contains(sc.ch)) {
sc.SetState(SCE_COFFEESCRIPT_IDENTIFIER);
} else if (sc.Match("///")) {
sc.SetState(SCE_COFFEESCRIPT_VERBOSE_REGEX);
sc.Forward();
sc.Forward();
} else if (sc.ch == '/'
&& (setOKBeforeRE.Contains(chPrevNonWhite)
|| followsKeyword(sc, styler))
&& (!setCouldBePostOp.Contains(chPrevNonWhite)
|| !FollowsPostfixOperator(sc, styler))) {
sc.SetState(SCE_COFFEESCRIPT_REGEX); // JavaScript's RegEx
} else if (sc.ch == '\"') {
sc.SetState(SCE_COFFEESCRIPT_STRING);
} else if (sc.ch == '\'') {
sc.SetState(SCE_COFFEESCRIPT_CHARACTER);
} else if (sc.ch == '#') {
if (sc.Match("###")) {
sc.SetState(SCE_COFFEESCRIPT_COMMENTBLOCK);
sc.Forward();
sc.Forward();
} else {
sc.SetState(SCE_COFFEESCRIPT_COMMENTLINE);
}
} else if (isoperator(static_cast<char>(sc.ch))) {
sc.SetState(SCE_COFFEESCRIPT_OPERATOR);
// Handle '..' and '...' operators correctly.
if (sc.ch == '.') {
for (int i = 0; i < 2 && sc.chNext == '.'; i++, sc.Forward()) ;
} else if (sc.ch == '{') {
++brace_counts;
} else if (sc.ch == '}' && --brace_counts <= 0 && inner_string_count > 0) {
// Return to previous state before #{ ... }
sc.ForwardSetState(exitInnerExpression(inner_string_types,
inner_expn_brace_counts,
inner_string_count,
brace_counts));
continue; // skip sc.Forward() at loop end
}
}
}
if (!IsASpace(sc.ch) && !IsSpaceEquiv(sc.state)) {
chPrevNonWhite = sc.ch;
visibleChars++;
}
sc.Forward();
}
sc.Complete();
}
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 void FoldCoffeeScriptDoc(Sci_PositionU startPos, Sci_Position length, int,
WordList *[], Accessor &styler) {
// A simplified version of FoldPyDoc
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
// property fold.coffeescript.comment
const bool foldComment = styler.GetPropertyInt("fold.coffeescript.comment") != 0;
const bool foldCompact = styler.GetPropertyInt("fold.compact") != 0;
// Backtrack to previous non-blank line so we can determine indent level
// for any white space lines
// 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))
break;
}
int indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
// Set up initial loop state
int prevComment = 0;
if (lineCurrent >= 1)
prevComment = foldComment && IsCommentLine(lineCurrent - 1, styler);
// Process all characters to end of requested range
// or comment that hangs over the end of the range. Cap processing in all cases
// to end of document (in case of comment at end).
while ((lineCurrent <= docLines) && ((lineCurrent <= maxLines) || prevComment)) {
// Gather info
int lev = indentCurrent;
Sci_Position lineNext = lineCurrent + 1;
int indentNext = indentCurrent;
if (lineNext <= docLines) {
// Information about next line is only available if not at end of document
indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
}
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 (!comment)
indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
if (indentNext & SC_FOLDLEVELWHITEFLAG)
indentNext = SC_FOLDLEVELWHITEFLAG | indentCurrentLevel;
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 ((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 = std::max(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 (foldCompact) {
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
skipLevel = levelBeforeComments;
int whiteFlag = skipLineIndent & SC_FOLDLEVELWHITEFLAG;
styler.SetLevel(skipLine, skipLevel | whiteFlag);
} else {
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments &&
!(skipLineIndent & SC_FOLDLEVELWHITEFLAG) &&
!IsCommentLine(skipLine, styler))
skipLevel = levelBeforeComments;
styler.SetLevel(skipLine, skipLevel);
}
}
// Set fold header on non-comment line
if (!comment && !(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK))
lev |= SC_FOLDLEVELHEADERFLAG;
}
// Keep track of block comment state of previous line
prevComment = comment_start || comment_continue;
// Set fold level for this line and move to next line
styler.SetLevel(lineCurrent, lev);
indentCurrent = indentNext;
lineCurrent = lineNext;
}
}
static const char *const csWordLists[] = {
"Keywords",
"Secondary keywords",
"Unused",
"Global classes",
0,
};
LexerModule lmCoffeeScript(SCLEX_COFFEESCRIPT, ColouriseCoffeeScriptDoc, "coffeescript", FoldCoffeeScriptDoc, csWordLists);
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