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geany/scintilla/lexers/LexRuby.cxx
Enrico Tröger 2c7d37dde4 Update Scintilla to version 2.22. 
Keep Scintilla's directory structure mostly and only remove unused lexers.

For now, this will break the build. The build systems have to be updated as well as scintilla_changes.patch.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/branches/unstable@5437 ea778897-0a13-0410-b9d1-a72fbfd435f5
2010-11-24 21:23:05 +00:00

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// Scintilla source code edit control
/** @file LexRuby.cxx
** Lexer for Ruby.
**/
// Copyright 2001- by Clemens Wyss <wys@helbling.ch>
// 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 "PropSetSimple.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
//XXX Identical to Perl, put in common area
static inline bool isEOLChar(char ch) {
return (ch == '\r') || (ch == '\n');
}
#define isSafeASCII(ch) ((unsigned int)(ch) <= 127)
// This one's redundant, but makes for more readable code
#define isHighBitChar(ch) ((unsigned int)(ch) > 127)
static inline bool isSafeAlpha(char ch) {
return (isSafeASCII(ch) && isalpha(ch)) || ch == '_';
}
static inline bool isSafeAlnum(char ch) {
return (isSafeASCII(ch) && isalnum(ch)) || ch == '_';
}
static inline bool isSafeAlnumOrHigh(char ch) {
return isHighBitChar(ch) || isalnum(ch) || ch == '_';
}
static inline bool isSafeDigit(char ch) {
return isSafeASCII(ch) && isdigit(ch);
}
static inline bool isSafeWordcharOrHigh(char ch) {
// Error: scintilla's KeyWords.h includes '.' as a word-char
// we want to separate things that can take methods from the
// methods.
return isHighBitChar(ch) || isalnum(ch) || ch == '_';
}
static bool inline iswhitespace(char ch) {
return ch == ' ' || ch == '\t';
}
#define MAX_KEYWORD_LENGTH 200
#define STYLE_MASK 63
#define actual_style(style) (style & STYLE_MASK)
static bool followsDot(unsigned int pos, Accessor &styler) {
styler.Flush();
for (; pos >= 1; --pos) {
int style = actual_style(styler.StyleAt(pos));
char ch;
switch (style) {
case SCE_RB_DEFAULT:
ch = styler[pos];
if (ch == ' ' || ch == '\t') {
//continue
} else {
return false;
}
break;
case SCE_RB_OPERATOR:
return styler[pos] == '.';
default:
return false;
}
}
return false;
}
// Forward declarations
static bool keywordIsAmbiguous(const char *prevWord);
static bool keywordDoStartsLoop(int pos,
Accessor &styler);
static bool keywordIsModifier(const char *word,
int pos,
Accessor &styler);
static int ClassifyWordRb(unsigned int start, unsigned int end, WordList &keywords, Accessor &styler, char *prevWord) {
char s[MAX_KEYWORD_LENGTH];
unsigned int i, j;
unsigned int lim = end - start + 1; // num chars to copy
if (lim >= MAX_KEYWORD_LENGTH) {
lim = MAX_KEYWORD_LENGTH - 1;
}
for (i = start, j = 0; j < lim; i++, j++) {
s[j] = styler[i];
}
s[j] = '\0';
int chAttr;
if (0 == strcmp(prevWord, "class"))
chAttr = SCE_RB_CLASSNAME;
else if (0 == strcmp(prevWord, "module"))
chAttr = SCE_RB_MODULE_NAME;
else if (0 == strcmp(prevWord, "def"))
chAttr = SCE_RB_DEFNAME;
else if (keywords.InList(s) && !followsDot(start - 1, styler)) {
if (keywordIsAmbiguous(s)
&& keywordIsModifier(s, start, styler)) {
// Demoted keywords are colored as keywords,
// but do not affect changes in indentation.
//
// Consider the word 'if':
// 1. <<if test ...>> : normal
// 2. <<stmt if test>> : demoted
// 3. <<lhs = if ...>> : normal: start a new indent level
// 4. <<obj.if = 10>> : color as identifer, since it follows '.'
chAttr = SCE_RB_WORD_DEMOTED;
} else {
chAttr = SCE_RB_WORD;
}
} else
chAttr = SCE_RB_IDENTIFIER;
styler.ColourTo(end, chAttr);
if (chAttr == SCE_RB_WORD) {
strcpy(prevWord, s);
} else {
prevWord[0] = 0;
}
return chAttr;
}
//XXX Identical to Perl, put in common area
static bool isMatch(Accessor &styler, int lengthDoc, int pos, const char *val) {
if ((pos + static_cast<int>(strlen(val))) >= lengthDoc) {
return false;
}
while (*val) {
if (*val != styler[pos++]) {
return false;
}
val++;
}
return true;
}
// Do Ruby better -- find the end of the line, work back,
// and then check for leading white space
// Precondition: the here-doc target can be indented
static bool lookingAtHereDocDelim(Accessor &styler,
int pos,
int lengthDoc,
const char *HereDocDelim)
{
if (!isMatch(styler, lengthDoc, pos, HereDocDelim)) {
return false;
}
while (--pos > 0) {
char ch = styler[pos];
if (isEOLChar(ch)) {
return true;
} else if (ch != ' ' && ch != '\t') {
return false;
}
}
return false;
}
//XXX Identical to Perl, put in common area
static char opposite(char ch) {
if (ch == '(')
return ')';
if (ch == '[')
return ']';
if (ch == '{')
return '}';
if (ch == '<')
return '>';
return ch;
}
// Null transitions when we see we've reached the end
// and need to relex the curr char.
static void redo_char(int &i, char &ch, char &chNext, char &chNext2,
int &state) {
i--;
chNext2 = chNext;
chNext = ch;
state = SCE_RB_DEFAULT;
}
static void advance_char(int &i, char &ch, char &chNext, char &chNext2) {
i++;
ch = chNext;
chNext = chNext2;
}
// precondition: startPos points to one after the EOL char
static bool currLineContainsHereDelims(int& startPos,
Accessor &styler) {
if (startPos <= 1)
return false;
int pos;
for (pos = startPos - 1; pos > 0; pos--) {
char ch = styler.SafeGetCharAt(pos);
if (isEOLChar(ch)) {
// Leave the pointers where they are -- there are no
// here doc delims on the current line, even if
// the EOL isn't default style
return false;
} else {
styler.Flush();
if (actual_style(styler.StyleAt(pos)) == SCE_RB_HERE_DELIM) {
break;
}
}
}
if (pos == 0) {
return false;
}
// Update the pointers so we don't have to re-analyze the string
startPos = pos;
return true;
}
// This class is used by the enter and exit methods, so it needs
// to be hoisted out of the function.
class QuoteCls {
public:
int Count;
char Up;
char Down;
QuoteCls() {
this->New();
}
void New() {
Count = 0;
Up = '\0';
Down = '\0';
}
void Open(char u) {
Count++;
Up = u;
Down = opposite(Up);
}
QuoteCls(const QuoteCls& q) {
// copy constructor -- use this for copying in
Count = q.Count;
Up = q.Up;
Down = q.Down;
}
QuoteCls& operator=(const QuoteCls& q) { // assignment constructor
if (this != &q) {
Count = q.Count;
Up = q.Up;
Down = q.Down;
}
return *this;
}
};
static void enterInnerExpression(int *p_inner_string_types,
int *p_inner_expn_brace_counts,
QuoteCls *p_inner_quotes,
int& inner_string_count,
int& state,
int& brace_counts,
QuoteCls curr_quote
) {
p_inner_string_types[inner_string_count] = state;
state = SCE_RB_DEFAULT;
p_inner_expn_brace_counts[inner_string_count] = brace_counts;
brace_counts = 0;
p_inner_quotes[inner_string_count] = curr_quote;
++inner_string_count;
}
static void exitInnerExpression(int *p_inner_string_types,
int *p_inner_expn_brace_counts,
QuoteCls *p_inner_quotes,
int& inner_string_count,
int& state,
int& brace_counts,
QuoteCls& curr_quote
) {
--inner_string_count;
state = p_inner_string_types[inner_string_count];
brace_counts = p_inner_expn_brace_counts[inner_string_count];
curr_quote = p_inner_quotes[inner_string_count];
}
static bool isEmptyLine(int pos,
Accessor &styler) {
int spaceFlags = 0;
int lineCurrent = styler.GetLine(pos);
int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
return (indentCurrent & SC_FOLDLEVELWHITEFLAG) != 0;
}
static bool RE_CanFollowKeyword(const char *keyword) {
if (!strcmp(keyword, "and")
|| !strcmp(keyword, "begin")
|| !strcmp(keyword, "break")
|| !strcmp(keyword, "case")
|| !strcmp(keyword, "do")
|| !strcmp(keyword, "else")
|| !strcmp(keyword, "elsif")
|| !strcmp(keyword, "if")
|| !strcmp(keyword, "next")
|| !strcmp(keyword, "return")
|| !strcmp(keyword, "when")
|| !strcmp(keyword, "unless")
|| !strcmp(keyword, "until")
|| !strcmp(keyword, "not")
|| !strcmp(keyword, "or")) {
return true;
}
return false;
}
// Look at chars up to but not including endPos
// Don't look at styles in case we're looking forward
static int skipWhitespace(int startPos,
int endPos,
Accessor &styler) {
for (int i = startPos; i < endPos; i++) {
if (!iswhitespace(styler[i])) {
return i;
}
}
return endPos;
}
// This routine looks for false positives like
// undef foo, <<
// There aren't too many.
//
// iPrev points to the start of <<
static bool sureThisIsHeredoc(int iPrev,
Accessor &styler,
char *prevWord) {
// Not so fast, since Ruby's so dynamic. Check the context
// to make sure we're OK.
int prevStyle;
int lineStart = styler.GetLine(iPrev);
int lineStartPosn = styler.LineStart(lineStart);
styler.Flush();
// Find the first word after some whitespace
int firstWordPosn = skipWhitespace(lineStartPosn, iPrev, styler);
if (firstWordPosn >= iPrev) {
// Have something like {^ <<}
//XXX Look at the first previous non-comment non-white line
// to establish the context. Not too likely though.
return true;
} else {
switch (prevStyle = styler.StyleAt(firstWordPosn)) {
case SCE_RB_WORD:
case SCE_RB_WORD_DEMOTED:
case SCE_RB_IDENTIFIER:
break;
default:
return true;
}
}
int firstWordEndPosn = firstWordPosn;
char *dst = prevWord;
for (;;) {
if (firstWordEndPosn >= iPrev ||
styler.StyleAt(firstWordEndPosn) != prevStyle) {
*dst = 0;
break;
}
*dst++ = styler[firstWordEndPosn];
firstWordEndPosn += 1;
}
//XXX Write a style-aware thing to regex scintilla buffer objects
if (!strcmp(prevWord, "undef")
|| !strcmp(prevWord, "def")
|| !strcmp(prevWord, "alias")) {
// These keywords are what we were looking for
return false;
}
return true;
}
// Routine that saves us from allocating a buffer for the here-doc target
// targetEndPos points one past the end of the current target
static bool haveTargetMatch(int currPos,
int lengthDoc,
int targetStartPos,
int targetEndPos,
Accessor &styler) {
if (lengthDoc - currPos < targetEndPos - targetStartPos) {
return false;
}
int i, j;
for (i = targetStartPos, j = currPos;
i < targetEndPos && j < lengthDoc;
i++, j++) {
if (styler[i] != styler[j]) {
return false;
}
}
return true;
}
// We need a check because the form
// [identifier] <<[target]
// is ambiguous. The Ruby lexer/parser resolves it by
// looking to see if [identifier] names a variable or a
// function. If it's the first, it's the start of a here-doc.
// If it's a var, it's an operator. This lexer doesn't
// maintain a symbol table, so it looks ahead to see what's
// going on, in cases where we have
// ^[white-space]*[identifier([.|::]identifier)*][white-space]*<<[target]
//
// If there's no occurrence of [target] on a line, assume we don't.
// return true == yes, we have no heredocs
static bool sureThisIsNotHeredoc(int lt2StartPos,
Accessor &styler) {
int prevStyle;
// Use full document, not just part we're styling
int lengthDoc = styler.Length();
int lineStart = styler.GetLine(lt2StartPos);
int lineStartPosn = styler.LineStart(lineStart);
styler.Flush();
const bool definitely_not_a_here_doc = true;
const bool looks_like_a_here_doc = false;
// Find the first word after some whitespace
int firstWordPosn = skipWhitespace(lineStartPosn, lt2StartPos, styler);
if (firstWordPosn >= lt2StartPos) {
return definitely_not_a_here_doc;
}
prevStyle = styler.StyleAt(firstWordPosn);
// If we have '<<' following a keyword, it's not a heredoc
if (prevStyle != SCE_RB_IDENTIFIER) {
return definitely_not_a_here_doc;
}
int newStyle = prevStyle;
// Some compilers incorrectly warn about uninit newStyle
for (firstWordPosn += 1; firstWordPosn <= lt2StartPos; firstWordPosn += 1) {
// Inner loop looks at the name
for (; firstWordPosn <= lt2StartPos; firstWordPosn += 1) {
newStyle = styler.StyleAt(firstWordPosn);
if (newStyle != prevStyle) {
break;
}
}
// Do we have '::' or '.'?
if (firstWordPosn < lt2StartPos && newStyle == SCE_RB_OPERATOR) {
char ch = styler[firstWordPosn];
if (ch == '.') {
// yes
} else if (ch == ':') {
if (styler.StyleAt(++firstWordPosn) != SCE_RB_OPERATOR) {
return definitely_not_a_here_doc;
} else if (styler[firstWordPosn] != ':') {
return definitely_not_a_here_doc;
}
} else {
break;
}
} else {
break;
}
}
// Skip next batch of white-space
firstWordPosn = skipWhitespace(firstWordPosn, lt2StartPos, styler);
if (firstWordPosn != lt2StartPos) {
// Have [[^ws[identifier]ws[*something_else*]ws<<
return definitely_not_a_here_doc;
}
// OK, now 'j' will point to the current spot moving ahead
int j = firstWordPosn + 1;
if (styler.StyleAt(j) != SCE_RB_OPERATOR || styler[j] != '<') {
// This shouldn't happen
return definitely_not_a_here_doc;
}
int nextLineStartPosn = styler.LineStart(lineStart + 1);
if (nextLineStartPosn >= lengthDoc) {
return definitely_not_a_here_doc;
}
j = skipWhitespace(j + 1, nextLineStartPosn, styler);
if (j >= lengthDoc) {
return definitely_not_a_here_doc;
}
bool allow_indent;
int target_start, target_end;
// From this point on no more styling, since we're looking ahead
if (styler[j] == '-') {
allow_indent = true;
j++;
} else {
allow_indent = false;
}
// Allow for quoted targets.
char target_quote = 0;
switch (styler[j]) {
case '\'':
case '"':
case '`':
target_quote = styler[j];
j += 1;
}
if (isSafeAlnum(styler[j])) {
// Init target_end because some compilers think it won't
// be initialized by the time it's used
target_start = target_end = j;
j++;
} else {
return definitely_not_a_here_doc;
}
for (; j < lengthDoc; j++) {
if (!isSafeAlnum(styler[j])) {
if (target_quote && styler[j] != target_quote) {
// unquoted end
return definitely_not_a_here_doc;
}
// And for now make sure that it's a newline
// don't handle arbitrary expressions yet
target_end = j;
if (target_quote) {
// Now we can move to the character after the string delimiter.
j += 1;
}
j = skipWhitespace(j, lengthDoc, styler);
if (j >= lengthDoc) {
return definitely_not_a_here_doc;
} else {
char ch = styler[j];
if (ch == '#' || isEOLChar(ch)) {
// This is OK, so break and continue;
break;
} else {
return definitely_not_a_here_doc;
}
}
}
}
// Just look at the start of each line
int last_line = styler.GetLine(lengthDoc - 1);
// But don't go too far
if (last_line > lineStart + 50) {
last_line = lineStart + 50;
}
for (int line_num = lineStart + 1; line_num <= last_line; line_num++) {
if (allow_indent) {
j = skipWhitespace(styler.LineStart(line_num), lengthDoc, styler);
} else {
j = styler.LineStart(line_num);
}
// target_end is one past the end
if (haveTargetMatch(j, lengthDoc, target_start, target_end, styler)) {
// We got it
return looks_like_a_here_doc;
}
}
return definitely_not_a_here_doc;
}
//todo: if we aren't looking at a stdio character,
// move to the start of the first line that is not in a
// multi-line construct
static void synchronizeDocStart(unsigned int& startPos,
int &length,
int &initStyle,
Accessor &styler,
bool skipWhiteSpace=false) {
styler.Flush();
int style = actual_style(styler.StyleAt(startPos));
switch (style) {
case SCE_RB_STDIN:
case SCE_RB_STDOUT:
case SCE_RB_STDERR:
// Don't do anything else with these.
return;
}
int pos = startPos;
// Quick way to characterize each line
int lineStart;
for (lineStart = styler.GetLine(pos); lineStart > 0; lineStart--) {
// Now look at the style before the previous line's EOL
pos = styler.LineStart(lineStart) - 1;
if (pos <= 10) {
lineStart = 0;
break;
}
char ch = styler.SafeGetCharAt(pos);
char chPrev = styler.SafeGetCharAt(pos - 1);
if (ch == '\n' && chPrev == '\r') {
pos--;
}
if (styler.SafeGetCharAt(pos - 1) == '\\') {
// Continuation line -- keep going
} else if (actual_style(styler.StyleAt(pos)) != SCE_RB_DEFAULT) {
// Part of multi-line construct -- keep going
} else if (currLineContainsHereDelims(pos, styler)) {
// Keep going, with pos and length now pointing
// at the end of the here-doc delimiter
} else if (skipWhiteSpace && isEmptyLine(pos, styler)) {
// Keep going
} else {
break;
}
}
pos = styler.LineStart(lineStart);
length += (startPos - pos);
startPos = pos;
initStyle = SCE_RB_DEFAULT;
}
static void ColouriseRbDoc(unsigned int startPos, int length, int initStyle,
WordList *keywordlists[], Accessor &styler) {
// Lexer for Ruby often has to backtrack to start of current style to determine
// which characters are being used as quotes, how deeply nested is the
// start position and what the termination string is for here documents
WordList &keywords = *keywordlists[0];
class HereDocCls {
public:
int State;
// States
// 0: '<<' encountered
// 1: collect the delimiter
// 1b: text between the end of the delimiter and the EOL
// 2: here doc text (lines after the delimiter)
char Quote; // the char after '<<'
bool Quoted; // true if Quote in ('\'','"','`')
int DelimiterLength; // strlen(Delimiter)
char Delimiter[256]; // the Delimiter, limit of 256: from Perl
bool CanBeIndented;
HereDocCls() {
State = 0;
DelimiterLength = 0;
Delimiter[0] = '\0';
CanBeIndented = false;
}
};
HereDocCls HereDoc;
QuoteCls Quote;
int numDots = 0; // For numbers --
// Don't start lexing in the middle of a num
synchronizeDocStart(startPos, length, initStyle, styler, // ref args
false);
bool preferRE = true;
int state = initStyle;
int lengthDoc = startPos + length;
char prevWord[MAX_KEYWORD_LENGTH + 1]; // 1 byte for zero
prevWord[0] = '\0';
if (length == 0)
return;
char chPrev = styler.SafeGetCharAt(startPos - 1);
char chNext = styler.SafeGetCharAt(startPos);
bool is_real_number = true; // Differentiate between constants and ?-sequences.
// Ruby uses a different mask because bad indentation is marked by oring with 32
styler.StartAt(startPos, 127);
styler.StartSegment(startPos);
static int q_states[] = {SCE_RB_STRING_Q,
SCE_RB_STRING_QQ,
SCE_RB_STRING_QR,
SCE_RB_STRING_QW,
SCE_RB_STRING_QW,
SCE_RB_STRING_QX};
static const char* q_chars = "qQrwWx";
// In most cases a value of 2 should be ample for the code in the
// Ruby library, and the code the user is likely to enter.
// For example,
// fu_output_message "mkdir #{options[:mode] ? ('-m %03o ' % options[:mode]) : ''}#{list.join ' '}"
// if options[:verbose]
// from fileutils.rb nests to a level of 2
// If the user actually hits a 6th occurrence of '#{' in a double-quoted
// string (including regex'es, %Q, %<sym>, %w, and other strings
// that interpolate), 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.
// If anyone runs into this problem, I recommend raising this
// value slightly higher to replacing the fixed array with a linked
// list. Keep in mind this code will be called everytime the lexer
// is invoked.
#define INNER_STRINGS_MAX_COUNT 5
// These vars track our instances of "...#{,,,%Q<..#{,,,}...>,,,}..."
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];
QuoteCls inner_quotes[INNER_STRINGS_MAX_COUNT];
int inner_string_count = 0;
int brace_counts = 0; // Number of #{ ... } things within an expression
int i;
for (i = 0; i < INNER_STRINGS_MAX_COUNT; i++) {
inner_string_types[i] = 0;
inner_expn_brace_counts[i] = 0;
}
for (i = startPos; i < lengthDoc; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
char chNext2 = styler.SafeGetCharAt(i + 2);
if (styler.IsLeadByte(ch)) {
chNext = chNext2;
chPrev = ' ';
i += 1;
continue;
}
// skip on DOS/Windows
//No, don't, because some things will get tagged on,
// so we won't recognize keywords, for example
#if 0
if (ch == '\r' && chNext == '\n') {
continue;
}
#endif
if (HereDoc.State == 1 && isEOLChar(ch)) {
// Begin of here-doc (the line after the here-doc delimiter):
HereDoc.State = 2;
styler.ColourTo(i-1, state);
// Don't check for a missing quote, just jump into
// the here-doc state
state = SCE_RB_HERE_Q;
}
// Regular transitions
if (state == SCE_RB_DEFAULT) {
if (isSafeDigit(ch)) {
styler.ColourTo(i - 1, state);
state = SCE_RB_NUMBER;
is_real_number = true;
numDots = 0;
} else if (isHighBitChar(ch) || iswordstart(ch)) {
styler.ColourTo(i - 1, state);
state = SCE_RB_WORD;
} else if (ch == '#') {
styler.ColourTo(i - 1, state);
state = SCE_RB_COMMENTLINE;
} else if (ch == '=') {
// =begin indicates the start of a comment (doc) block
if (i == 0 || (isEOLChar(chPrev)
&& chNext == 'b'
&& styler.SafeGetCharAt(i + 2) == 'e'
&& styler.SafeGetCharAt(i + 3) == 'g'
&& styler.SafeGetCharAt(i + 4) == 'i'
&& styler.SafeGetCharAt(i + 5) == 'n'
&& !isSafeWordcharOrHigh(styler.SafeGetCharAt(i + 6)))) {
styler.ColourTo(i - 1, state);
state = SCE_RB_POD;
} else {
styler.ColourTo(i - 1, state);
styler.ColourTo(i, SCE_RB_OPERATOR);
preferRE = true;
}
} else if (ch == '"') {
styler.ColourTo(i - 1, state);
state = SCE_RB_STRING;
Quote.New();
Quote.Open(ch);
} else if (ch == '\'') {
styler.ColourTo(i - 1, state);
state = SCE_RB_CHARACTER;
Quote.New();
Quote.Open(ch);
} else if (ch == '`') {
styler.ColourTo(i - 1, state);
state = SCE_RB_BACKTICKS;
Quote.New();
Quote.Open(ch);
} else if (ch == '@') {
// Instance or class var
styler.ColourTo(i - 1, state);
if (chNext == '@') {
state = SCE_RB_CLASS_VAR;
advance_char(i, ch, chNext, chNext2); // pass by ref
} else {
state = SCE_RB_INSTANCE_VAR;
}
} else if (ch == '$') {
// Check for a builtin global
styler.ColourTo(i - 1, state);
// Recognize it bit by bit
state = SCE_RB_GLOBAL;
} else if (ch == '/' && preferRE) {
// Ambigous operator
styler.ColourTo(i - 1, state);
state = SCE_RB_REGEX;
Quote.New();
Quote.Open(ch);
} else if (ch == '<' && chNext == '<' && chNext2 != '=') {
// Recognise the '<<' symbol - either a here document or a binary op
styler.ColourTo(i - 1, state);
i++;
chNext = chNext2;
styler.ColourTo(i, SCE_RB_OPERATOR);
if (! (strchr("\"\'`_-", chNext2) || isSafeAlpha(chNext2))) {
// It's definitely not a here-doc,
// based on Ruby's lexer/parser in the
// heredoc_identifier routine.
// Nothing else to do.
} else if (preferRE) {
if (sureThisIsHeredoc(i - 1, styler, prevWord)) {
state = SCE_RB_HERE_DELIM;
HereDoc.State = 0;
}
// else leave it in default state
} else {
if (sureThisIsNotHeredoc(i - 1, styler)) {
// leave state as default
// We don't have all the heuristics Perl has for indications
// of a here-doc, because '<<' is overloadable and used
// for so many other classes.
} else {
state = SCE_RB_HERE_DELIM;
HereDoc.State = 0;
}
}
preferRE = (state != SCE_RB_HERE_DELIM);
} else if (ch == ':') {
styler.ColourTo(i - 1, state);
if (chNext == ':') {
// Mark "::" as an operator, not symbol start
styler.ColourTo(i + 1, SCE_RB_OPERATOR);
advance_char(i, ch, chNext, chNext2); // pass by ref
state = SCE_RB_DEFAULT;
preferRE = false;
} else if (isSafeWordcharOrHigh(chNext)) {
state = SCE_RB_SYMBOL;
} else if (strchr("[*!~+-*/%=<>&^|", chNext)) {
// Do the operator analysis in-line, looking ahead
// Based on the table in pickaxe 2nd ed., page 339
bool doColoring = true;
switch (chNext) {
case '[':
if (chNext2 == ']' ) {
char ch_tmp = styler.SafeGetCharAt(i + 3);
if (ch_tmp == '=') {
i += 3;
ch = ch_tmp;
chNext = styler.SafeGetCharAt(i + 1);
} else {
i += 2;
ch = chNext2;
chNext = ch_tmp;
}
} else {
doColoring = false;
}
break;
case '*':
if (chNext2 == '*') {
i += 2;
ch = chNext2;
chNext = styler.SafeGetCharAt(i + 1);
} else {
advance_char(i, ch, chNext, chNext2);
}
break;
case '!':
if (chNext2 == '=' || chNext2 == '~') {
i += 2;
ch = chNext2;
chNext = styler.SafeGetCharAt(i + 1);
} else {
advance_char(i, ch, chNext, chNext2);
}
break;
case '<':
if (chNext2 == '<') {
i += 2;
ch = chNext2;
chNext = styler.SafeGetCharAt(i + 1);
} else if (chNext2 == '=') {
char ch_tmp = styler.SafeGetCharAt(i + 3);
if (ch_tmp == '>') { // <=> operator
i += 3;
ch = ch_tmp;
chNext = styler.SafeGetCharAt(i + 1);
} else {
i += 2;
ch = chNext2;
chNext = ch_tmp;
}
} else {
advance_char(i, ch, chNext, chNext2);
}
break;
default:
// Simple one-character operators
advance_char(i, ch, chNext, chNext2);
break;
}
if (doColoring) {
styler.ColourTo(i, SCE_RB_SYMBOL);
state = SCE_RB_DEFAULT;
}
} else if (!preferRE) {
// Don't color symbol strings (yet)
// Just color the ":" and color rest as string
styler.ColourTo(i, SCE_RB_SYMBOL);
state = SCE_RB_DEFAULT;
} else {
styler.ColourTo(i, SCE_RB_OPERATOR);
state = SCE_RB_DEFAULT;
preferRE = true;
}
} else if (ch == '%') {
styler.ColourTo(i - 1, state);
bool have_string = false;
if (strchr(q_chars, chNext) && !isSafeWordcharOrHigh(chNext2)) {
Quote.New();
const char *hit = strchr(q_chars, chNext);
if (hit != NULL) {
state = q_states[hit - q_chars];
Quote.Open(chNext2);
i += 2;
ch = chNext2;
chNext = styler.SafeGetCharAt(i + 1);
have_string = true;
}
} else if (preferRE && !isSafeWordcharOrHigh(chNext)) {
// Ruby doesn't allow high bit chars here,
// but the editor host might
Quote.New();
state = SCE_RB_STRING_QQ;
Quote.Open(chNext);
advance_char(i, ch, chNext, chNext2); // pass by ref
have_string = true;
} else if (!isSafeWordcharOrHigh(chNext) && !iswhitespace(chNext) && !isEOLChar(chNext)) {
// Ruby doesn't allow high bit chars here,
// but the editor host might
Quote.New();
state = SCE_RB_STRING_QQ;
Quote.Open(chNext);
advance_char(i, ch, chNext, chNext2); // pass by ref
have_string = true;
}
if (!have_string) {
styler.ColourTo(i, SCE_RB_OPERATOR);
// stay in default
preferRE = true;
}
} else if (ch == '?') {
styler.ColourTo(i - 1, state);
if (iswhitespace(chNext) || chNext == '\n' || chNext == '\r') {
styler.ColourTo(i, SCE_RB_OPERATOR);
} else {
// It's the start of a character code escape sequence
// Color it as a number.
state = SCE_RB_NUMBER;
is_real_number = false;
}
} else if (isoperator(ch) || ch == '.') {
styler.ColourTo(i - 1, state);
styler.ColourTo(i, SCE_RB_OPERATOR);
// If we're ending an expression or block,
// assume it ends an object, and the ambivalent
// constructs are binary operators
//
// So if we don't have one of these chars,
// we aren't ending an object exp'n, and ops
// like : << / are unary operators.
if (ch == '{') {
++brace_counts;
preferRE = true;
} else if (ch == '}' && --brace_counts < 0
&& inner_string_count > 0) {
styler.ColourTo(i, SCE_RB_OPERATOR);
exitInnerExpression(inner_string_types,
inner_expn_brace_counts,
inner_quotes,
inner_string_count,
state, brace_counts, Quote);
} else {
preferRE = (strchr(")}].", ch) == NULL);
}
// Stay in default state
} else if (isEOLChar(ch)) {
// Make sure it's a true line-end, with no backslash
if ((ch == '\r' || (ch == '\n' && chPrev != '\r'))
&& chPrev != '\\') {
// Assume we've hit the end of the statement.
preferRE = true;
}
}
} else if (state == SCE_RB_WORD) {
if (ch == '.' || !isSafeWordcharOrHigh(ch)) {
// Words include x? in all contexts,
// and <letters>= after either 'def' or a dot
// Move along until a complete word is on our left
// Default accessor treats '.' as word-chars,
// but we don't for now.
if (ch == '='
&& isSafeWordcharOrHigh(chPrev)
&& (chNext == '('
|| strchr(" \t\n\r", chNext) != NULL)
&& (!strcmp(prevWord, "def")
|| followsDot(styler.GetStartSegment(), styler))) {
// <name>= is a name only when being def'd -- Get it the next time
// This means that <name>=<name> is always lexed as
// <name>, (op, =), <name>
} else if ((ch == '?' || ch == '!')
&& isSafeWordcharOrHigh(chPrev)
&& !isSafeWordcharOrHigh(chNext)) {
// <name>? is a name -- Get it the next time
// But <name>?<name> is always lexed as
// <name>, (op, ?), <name>
// Same with <name>! to indicate a method that
// modifies its target
} else if (isEOLChar(ch)
&& isMatch(styler, lengthDoc, i - 7, "__END__")) {
styler.ColourTo(i, SCE_RB_DATASECTION);
state = SCE_RB_DATASECTION;
// No need to handle this state -- we'll just move to the end
preferRE = false;
} else {
int wordStartPos = styler.GetStartSegment();
int word_style = ClassifyWordRb(wordStartPos, i - 1, keywords, styler, prevWord);
switch (word_style) {
case SCE_RB_WORD:
preferRE = RE_CanFollowKeyword(prevWord);
break;
case SCE_RB_WORD_DEMOTED:
preferRE = true;
break;
case SCE_RB_IDENTIFIER:
if (isMatch(styler, lengthDoc, wordStartPos, "print")) {
preferRE = true;
} else if (isEOLChar(ch)) {
preferRE = true;
} else {
preferRE = false;
}
break;
default:
preferRE = false;
}
if (ch == '.') {
// We might be redefining an operator-method
preferRE = false;
}
// And if it's the first
redo_char(i, ch, chNext, chNext2, state); // pass by ref
}
}
} else if (state == SCE_RB_NUMBER) {
if (!is_real_number) {
if (ch != '\\') {
styler.ColourTo(i, state);
state = SCE_RB_DEFAULT;
preferRE = false;
} else if (strchr("\\ntrfvaebs", chNext)) {
// Terminal escape sequence -- handle it next time
// Nothing more to do this time through the loop
} else if (chNext == 'C' || chNext == 'M') {
if (chNext2 != '-') {
// \C or \M ends the sequence -- handle it next time
} else {
// Move from abc?\C-x
// ^
// to
// ^
i += 2;
ch = chNext2;
chNext = styler.SafeGetCharAt(i + 1);
}
} else if (chNext == 'c') {
// Stay here, \c is a combining sequence
advance_char(i, ch, chNext, chNext2); // pass by ref
} else {
// ?\x, including ?\\ is final.
styler.ColourTo(i + 1, state);
state = SCE_RB_DEFAULT;
preferRE = false;
advance_char(i, ch, chNext, chNext2);
}
} else if (isSafeAlnumOrHigh(ch) || ch == '_') {
// Keep going
} else if (ch == '.' && chNext == '.') {
++numDots;
styler.ColourTo(i - 1, state);
redo_char(i, ch, chNext, chNext2, state); // pass by ref
} else if (ch == '.' && ++numDots == 1) {
// Keep going
} else {
styler.ColourTo(i - 1, state);
redo_char(i, ch, chNext, chNext2, state); // pass by ref
preferRE = false;
}
} else if (state == SCE_RB_COMMENTLINE) {
if (isEOLChar(ch)) {
styler.ColourTo(i - 1, state);
state = SCE_RB_DEFAULT;
// Use whatever setting we had going into the comment
}
} else if (state == SCE_RB_HERE_DELIM) {
// See the comment for SCE_RB_HERE_DELIM in LexPerl.cxx
// Slightly different: if we find an immediate '-',
// the target can appear indented.
if (HereDoc.State == 0) { // '<<' encountered
HereDoc.State = 1;
HereDoc.DelimiterLength = 0;
if (ch == '-') {
HereDoc.CanBeIndented = true;
advance_char(i, ch, chNext, chNext2); // pass by ref
} else {
HereDoc.CanBeIndented = false;
}
if (isEOLChar(ch)) {
// Bail out of doing a here doc if there's no target
state = SCE_RB_DEFAULT;
preferRE = false;
} else {
HereDoc.Quote = ch;
if (ch == '\'' || ch == '"' || ch == '`') {
HereDoc.Quoted = true;
HereDoc.Delimiter[0] = '\0';
} else {
HereDoc.Quoted = false;
HereDoc.Delimiter[0] = ch;
HereDoc.Delimiter[1] = '\0';
HereDoc.DelimiterLength = 1;
}
}
} else if (HereDoc.State == 1) { // collect the delimiter
if (isEOLChar(ch)) {
// End the quote now, and go back for more
styler.ColourTo(i - 1, state);
state = SCE_RB_DEFAULT;
i--;
chNext = ch;
chNext2 = chNext;
preferRE = false;
} else if (HereDoc.Quoted) {
if (ch == HereDoc.Quote) { // closing quote => end of delimiter
styler.ColourTo(i, state);
state = SCE_RB_DEFAULT;
preferRE = false;
} else {
if (ch == '\\' && !isEOLChar(chNext)) {
advance_char(i, ch, chNext, chNext2);
}
HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
}
} else { // an unquoted here-doc delimiter
if (isSafeAlnumOrHigh(ch) || ch == '_') {
HereDoc.Delimiter[HereDoc.DelimiterLength++] = ch;
HereDoc.Delimiter[HereDoc.DelimiterLength] = '\0';
} else {
styler.ColourTo(i - 1, state);
redo_char(i, ch, chNext, chNext2, state);
preferRE = false;
}
}
if (HereDoc.DelimiterLength >= static_cast<int>(sizeof(HereDoc.Delimiter)) - 1) {
styler.ColourTo(i - 1, state);
state = SCE_RB_ERROR;
preferRE = false;
}
}
} else if (state == SCE_RB_HERE_Q) {
// Not needed: HereDoc.State == 2
// Indentable here docs: look backwards
// Non-indentable: look forwards, like in Perl
//
// Why: so we can quickly resolve things like <<-" abc"
if (!HereDoc.CanBeIndented) {
if (isEOLChar(chPrev)
&& isMatch(styler, lengthDoc, i, HereDoc.Delimiter)) {
styler.ColourTo(i - 1, state);
i += HereDoc.DelimiterLength - 1;
chNext = styler.SafeGetCharAt(i + 1);
if (isEOLChar(chNext)) {
styler.ColourTo(i, SCE_RB_HERE_DELIM);
state = SCE_RB_DEFAULT;
HereDoc.State = 0;
preferRE = false;
}
// Otherwise we skipped through the here doc faster.
}
} else if (isEOLChar(chNext)
&& lookingAtHereDocDelim(styler,
i - HereDoc.DelimiterLength + 1,
lengthDoc,
HereDoc.Delimiter)) {
styler.ColourTo(i - 1 - HereDoc.DelimiterLength, state);
styler.ColourTo(i, SCE_RB_HERE_DELIM);
state = SCE_RB_DEFAULT;
preferRE = false;
HereDoc.State = 0;
}
} else if (state == SCE_RB_CLASS_VAR
|| state == SCE_RB_INSTANCE_VAR
|| state == SCE_RB_SYMBOL) {
if (!isSafeWordcharOrHigh(ch)) {
styler.ColourTo(i - 1, state);
redo_char(i, ch, chNext, chNext2, state); // pass by ref
preferRE = false;
}
} else if (state == SCE_RB_GLOBAL) {
if (!isSafeWordcharOrHigh(ch)) {
// handle special globals here as well
if (chPrev == '$') {
if (ch == '-') {
// Include the next char, like $-a
advance_char(i, ch, chNext, chNext2);
}
styler.ColourTo(i, state);
state = SCE_RB_DEFAULT;
} else {
styler.ColourTo(i - 1, state);
redo_char(i, ch, chNext, chNext2, state); // pass by ref
}
preferRE = false;
}
} else if (state == SCE_RB_POD) {
// PODs end with ^=end\s, -- any whitespace can follow =end
if (strchr(" \t\n\r", ch) != NULL
&& i > 5
&& isEOLChar(styler[i - 5])
&& isMatch(styler, lengthDoc, i - 4, "=end")) {
styler.ColourTo(i - 1, state);
state = SCE_RB_DEFAULT;
preferRE = false;
}
} else if (state == SCE_RB_REGEX || state == SCE_RB_STRING_QR) {
if (ch == '\\' && Quote.Up != '\\') {
// Skip one
advance_char(i, ch, chNext, chNext2);
} else if (ch == Quote.Down) {
Quote.Count--;
if (Quote.Count == 0) {
// Include the options
while (isSafeAlpha(chNext)) {
i++;
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
}
styler.ColourTo(i, state);
state = SCE_RB_DEFAULT;
preferRE = false;
}
} else if (ch == Quote.Up) {
// Only if close quoter != open quoter
Quote.Count++;
} else if (ch == '#' ) {
if (chNext == '{'
&& inner_string_count < INNER_STRINGS_MAX_COUNT) {
// process #{ ... }
styler.ColourTo(i - 1, state);
styler.ColourTo(i + 1, SCE_RB_OPERATOR);
enterInnerExpression(inner_string_types,
inner_expn_brace_counts,
inner_quotes,
inner_string_count,
state,
brace_counts,
Quote);
preferRE = true;
// Skip one
advance_char(i, ch, chNext, chNext2);
} else {
//todo: distinguish comments from pound chars
// for now, handle as comment
styler.ColourTo(i - 1, state);
bool inEscape = false;
while (++i < lengthDoc) {
ch = styler.SafeGetCharAt(i);
if (ch == '\\') {
inEscape = true;
} else if (isEOLChar(ch)) {
// Comment inside a regex
styler.ColourTo(i - 1, SCE_RB_COMMENTLINE);
break;
} else if (inEscape) {
inEscape = false; // don't look at char
} else if (ch == Quote.Down) {
// Have the regular handler deal with this
// to get trailing modifiers.
i--;
ch = styler[i];
break;
}
}
chNext = styler.SafeGetCharAt(i + 1);
chNext2 = styler.SafeGetCharAt(i + 2);
}
}
// Quotes of all kinds...
} else if (state == SCE_RB_STRING_Q || state == SCE_RB_STRING_QQ ||
state == SCE_RB_STRING_QX || state == SCE_RB_STRING_QW ||
state == SCE_RB_STRING || state == SCE_RB_CHARACTER ||
state == SCE_RB_BACKTICKS) {
if (!Quote.Down && !isspacechar(ch)) {
Quote.Open(ch);
} else if (ch == '\\' && Quote.Up != '\\') {
//Riddle me this: Is it safe to skip *every* escaped char?
advance_char(i, ch, chNext, chNext2);
} else if (ch == Quote.Down) {
Quote.Count--;
if (Quote.Count == 0) {
styler.ColourTo(i, state);
state = SCE_RB_DEFAULT;
preferRE = false;
}
} else if (ch == Quote.Up) {
Quote.Count++;
} else if (ch == '#' && chNext == '{'
&& inner_string_count < INNER_STRINGS_MAX_COUNT
&& state != SCE_RB_CHARACTER
&& state != SCE_RB_STRING_Q) {
// process #{ ... }
styler.ColourTo(i - 1, state);
styler.ColourTo(i + 1, SCE_RB_OPERATOR);
enterInnerExpression(inner_string_types,
inner_expn_brace_counts,
inner_quotes,
inner_string_count,
state,
brace_counts,
Quote);
preferRE = true;
// Skip one
advance_char(i, ch, chNext, chNext2);
}
}
if (state == SCE_RB_ERROR) {
break;
}
chPrev = ch;
}
if (state == SCE_RB_WORD) {
// We've ended on a word, possibly at EOF, and need to
// classify it.
(void) ClassifyWordRb(styler.GetStartSegment(), lengthDoc - 1, keywords, styler, prevWord);
} else {
styler.ColourTo(lengthDoc - 1, state);
}
}
// Helper functions for folding, disambiguation keywords
// Assert that there are no high-bit chars
static void getPrevWord(int pos,
char *prevWord,
Accessor &styler,
int word_state)
{
int i;
styler.Flush();
for (i = pos - 1; i > 0; i--) {
if (actual_style(styler.StyleAt(i)) != word_state) {
i++;
break;
}
}
if (i < pos - MAX_KEYWORD_LENGTH) // overflow
i = pos - MAX_KEYWORD_LENGTH;
char *dst = prevWord;
for (; i <= pos; i++) {
*dst++ = styler[i];
}
*dst = 0;
}
static bool keywordIsAmbiguous(const char *prevWord)
{
// Order from most likely used to least likely
// Lots of ways to do a loop in Ruby besides 'while/until'
if (!strcmp(prevWord, "if")
|| !strcmp(prevWord, "do")
|| !strcmp(prevWord, "while")
|| !strcmp(prevWord, "unless")
|| !strcmp(prevWord, "until")) {
return true;
} else {
return false;
}
}
// Demote keywords in the following conditions:
// if, while, unless, until modify a statement
// do after a while or until, as a noise word (like then after if)
static bool keywordIsModifier(const char *word,
int pos,
Accessor &styler)
{
if (word[0] == 'd' && word[1] == 'o' && !word[2]) {
return keywordDoStartsLoop(pos, styler);
}
char ch, chPrev, chPrev2;
int style = SCE_RB_DEFAULT;
int lineStart = styler.GetLine(pos);
int lineStartPosn = styler.LineStart(lineStart);
// We want to step backwards until we don't care about the current
// position. But first move lineStartPosn back behind any
// continuations immediately above word.
while (lineStartPosn > 0) {
ch = styler[lineStartPosn-1];
if (ch == '\n' || ch == '\r') {
chPrev = styler.SafeGetCharAt(lineStartPosn-2);
chPrev2 = styler.SafeGetCharAt(lineStartPosn-3);
lineStart = styler.GetLine(lineStartPosn-1);
// If we find a continuation line, include it in our analysis.
if (chPrev == '\\') {
lineStartPosn = styler.LineStart(lineStart);
} else if (ch == '\n' && chPrev == '\r' && chPrev2 == '\\') {
lineStartPosn = styler.LineStart(lineStart);
} else {
break;
}
} else {
break;
}
}
styler.Flush();
while (--pos >= lineStartPosn) {
style = actual_style(styler.StyleAt(pos));
if (style == SCE_RB_DEFAULT) {
if (iswhitespace(ch = styler[pos])) {
//continue
} else if (ch == '\r' || ch == '\n') {
// Scintilla's LineStart() and GetLine() routines aren't
// platform-independent, so if we have text prepared with
// a different system we can't rely on it.
// Also, lineStartPosn may have been moved to more than one
// line above word's line while pushing past continuations.
chPrev = styler.SafeGetCharAt(pos - 1);
chPrev2 = styler.SafeGetCharAt(pos - 2);
if (chPrev == '\\') {
pos-=1; // gloss over the "\\"
//continue
} else if (ch == '\n' && chPrev == '\r' && chPrev2 == '\\') {
pos-=2; // gloss over the "\\\r"
//continue
} else {
return false;
}
}
} else {
break;
}
}
if (pos < lineStartPosn) {
return false;
}
// First things where the action is unambiguous
switch (style) {
case SCE_RB_DEFAULT:
case SCE_RB_COMMENTLINE:
case SCE_RB_POD:
case SCE_RB_CLASSNAME:
case SCE_RB_DEFNAME:
case SCE_RB_MODULE_NAME:
return false;
case SCE_RB_OPERATOR:
break;
case SCE_RB_WORD:
// Watch out for uses of 'else if'
//XXX: Make a list of other keywords where 'if' isn't a modifier
// and can appear legitimately
// Formulate this to avoid warnings from most compilers
if (strcmp(word, "if") == 0) {
char prevWord[MAX_KEYWORD_LENGTH + 1];
getPrevWord(pos, prevWord, styler, SCE_RB_WORD);
return strcmp(prevWord, "else") != 0;
}
return true;
default:
return true;
}
// Assume that if the keyword follows an operator,
// usually it's a block assignment, like
// a << if x then y else z
ch = styler[pos];
switch (ch) {
case ')':
case ']':
case '}':
return true;
default:
return false;
}
}
#define WHILE_BACKWARDS "elihw"
#define UNTIL_BACKWARDS "litnu"
// Nothing fancy -- look to see if we follow a while/until somewhere
// on the current line
static bool keywordDoStartsLoop(int pos,
Accessor &styler)
{
char ch;
int style;
int lineStart = styler.GetLine(pos);
int lineStartPosn = styler.LineStart(lineStart);
styler.Flush();
while (--pos >= lineStartPosn) {
style = actual_style(styler.StyleAt(pos));
if (style == SCE_RB_DEFAULT) {
if ((ch = styler[pos]) == '\r' || ch == '\n') {
// Scintilla's LineStart() and GetLine() routines aren't
// platform-independent, so if we have text prepared with
// a different system we can't rely on it.
return false;
}
} else if (style == SCE_RB_WORD) {
// Check for while or until, but write the word in backwards
char prevWord[MAX_KEYWORD_LENGTH + 1]; // 1 byte for zero
char *dst = prevWord;
int wordLen = 0;
int start_word;
for (start_word = pos;
start_word >= lineStartPosn && actual_style(styler.StyleAt(start_word)) == SCE_RB_WORD;
start_word--) {
if (++wordLen < MAX_KEYWORD_LENGTH) {
*dst++ = styler[start_word];
}
}
*dst = 0;
// Did we see our keyword?
if (!strcmp(prevWord, WHILE_BACKWARDS)
|| !strcmp(prevWord, UNTIL_BACKWARDS)) {
return true;
}
// We can move pos to the beginning of the keyword, and then
// accept another decrement, as we can never have two contiguous
// keywords:
// word1 word2
// ^
// <- move to start_word
// ^
// <- loop decrement
// ^ # pointing to end of word1 is fine
pos = start_word;
}
}
return false;
}
/*
* Folding Ruby
*
* The language is quite complex to analyze without a full parse.
* For example, this line shouldn't affect fold level:
*
* print "hello" if feeling_friendly?
*
* Neither should this:
*
* print "hello" \
* if feeling_friendly?
*
*
* But this should:
*
* if feeling_friendly? #++
* print "hello" \
* print "goodbye"
* end #--
*
* So we cheat, by actually looking at the existing indentation
* levels for each line, and just echoing it back. Like Python.
* Then if we get better at it, we'll take braces into consideration,
* which always affect folding levels.
* How the keywords should work:
* No effect:
* __FILE__ __LINE__ BEGIN END alias and
* defined? false in nil not or self super then
* true undef
* Always increment:
* begin class def do for module when {
*
* Always decrement:
* end }
*
* Increment if these start a statement
* if unless until while -- do nothing if they're modifiers
* These end a block if there's no modifier, but don't bother
* break next redo retry return yield
*
* These temporarily de-indent, but re-indent
* case else elsif ensure rescue
*
* This means that the folder reflects indentation rather
* than setting it. The language-service updates indentation
* when users type return and finishes entering de-denters.
*
* Later offer to fold POD, here-docs, strings, and blocks of comments
*/
static void FoldRbDoc(unsigned int startPos, int length, int initStyle,
WordList *[], Accessor &styler) {
const bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
synchronizeDocStart(startPos, length, initStyle, styler, // ref args
false);
unsigned int endPos = startPos + length;
int visibleChars = 0;
int lineCurrent = styler.GetLine(startPos);
int levelPrev = startPos == 0 ? 0 : (styler.LevelAt(lineCurrent)
& SC_FOLDLEVELNUMBERMASK
& ~SC_FOLDLEVELBASE);
int levelCurrent = levelPrev;
char chNext = styler[startPos];
int styleNext = styler.StyleAt(startPos);
int stylePrev = startPos <= 1 ? SCE_RB_DEFAULT : styler.StyleAt(startPos - 1);
bool buffer_ends_with_eol = false;
for (unsigned int i = startPos; i < endPos; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
int style = styleNext;
styleNext = styler.StyleAt(i + 1);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (style == SCE_RB_COMMENTLINE) {
if (foldComment && stylePrev != SCE_RB_COMMENTLINE) {
if (chNext == '{') {
levelCurrent++;
} else if (chNext == '}' && levelCurrent > 0) {
levelCurrent--;
}
}
} else if (style == SCE_RB_OPERATOR) {
if (strchr("[{(", ch)) {
levelCurrent++;
} else if (strchr(")}]", ch)) {
// Don't decrement below 0
if (levelCurrent > 0)
levelCurrent--;
}
} else if (style == SCE_RB_WORD && styleNext != SCE_RB_WORD) {
// Look at the keyword on the left and decide what to do
char prevWord[MAX_KEYWORD_LENGTH + 1]; // 1 byte for zero
prevWord[0] = 0;
getPrevWord(i, prevWord, styler, SCE_RB_WORD);
if (!strcmp(prevWord, "end")) {
// Don't decrement below 0
if (levelCurrent > 0)
levelCurrent--;
} else if ( !strcmp(prevWord, "if")
|| !strcmp(prevWord, "def")
|| !strcmp(prevWord, "class")
|| !strcmp(prevWord, "module")
|| !strcmp(prevWord, "begin")
|| !strcmp(prevWord, "case")
|| !strcmp(prevWord, "do")
|| !strcmp(prevWord, "while")
|| !strcmp(prevWord, "unless")
|| !strcmp(prevWord, "until")
|| !strcmp(prevWord, "for")
) {
levelCurrent++;
}
}
if (atEOL) {
int lev = levelPrev;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev) && (visibleChars > 0))
lev |= SC_FOLDLEVELHEADERFLAG;
styler.SetLevel(lineCurrent, lev|SC_FOLDLEVELBASE);
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
buffer_ends_with_eol = true;
} else if (!isspacechar(ch)) {
visibleChars++;
buffer_ends_with_eol = false;
}
stylePrev = style;
}
// Fill in the real level of the next line, keeping the current flags as they will be filled in later
if (!buffer_ends_with_eol) {
lineCurrent++;
int new_lev = levelCurrent;
if (visibleChars == 0 && foldCompact)
new_lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev) && (visibleChars > 0))
new_lev |= SC_FOLDLEVELHEADERFLAG;
levelCurrent = new_lev;
}
styler.SetLevel(lineCurrent, levelCurrent|SC_FOLDLEVELBASE);
}
static const char * const rubyWordListDesc[] = {
"Keywords",
0
};
LexerModule lmRuby(SCLEX_RUBY, ColouriseRbDoc, "ruby", FoldRbDoc, rubyWordListDesc);
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