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notepad-plus-plus/scintilla/lexers/LexErlang.cxx
Don Ho 0152ded3ff [UPDATE] Scintilla update from 2.21 to 2.25 
git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@742 f5eea248-9336-0410-98b8-ebc06183d4e3
2011-03-22 00:16:49 +00:00

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// Scintilla source code edit control
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
/** @file LexErlang.cxx
** Lexer for Erlang.
** Enhanced by Etienne 'Lenain' Girondel (lenaing@gmail.com)
** Originally wrote by Peter-Henry Mander,
** based on Matlab lexer by José Fonseca.
**/
#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 int is_radix(int radix, int ch) {
int digit;
if (36 < radix || 2 > radix)
return 0;
if (isdigit(ch)) {
digit = ch - '0';
} else if (isalnum(ch)) {
digit = toupper(ch) - 'A' + 10;
} else {
return 0;
}
return (digit < radix);
}
typedef enum {
STATE_NULL,
COMMENT,
COMMENT_FUNCTION,
COMMENT_MODULE,
COMMENT_DOC,
COMMENT_DOC_MACRO,
ATOM_UNQUOTED,
ATOM_QUOTED,
NODE_NAME_UNQUOTED,
NODE_NAME_QUOTED,
MACRO_START,
MACRO_UNQUOTED,
MACRO_QUOTED,
RECORD_START,
RECORD_UNQUOTED,
RECORD_QUOTED,
NUMERAL_START,
NUMERAL_BASE_VALUE,
NUMERAL_FLOAT,
NUMERAL_EXPONENT,
PREPROCESSOR
} atom_parse_state_t;
static inline bool IsAWordChar(const int ch) {
return (ch < 0x80) && (ch != ' ') && (isalnum(ch) || ch == '_');
}
static void ColouriseErlangDoc(unsigned int startPos, int length, int initStyle,
WordList *keywordlists[], Accessor &styler) {
StyleContext sc(startPos, length, initStyle, styler);
WordList &reservedWords = *keywordlists[0];
WordList &erlangBIFs = *keywordlists[1];
WordList &erlangPreproc = *keywordlists[2];
WordList &erlangModulesAtt = *keywordlists[3];
WordList &erlangDoc = *keywordlists[4];
WordList &erlangDocMacro = *keywordlists[5];
int radix_digits = 0;
int exponent_digits = 0;
atom_parse_state_t parse_state = STATE_NULL;
atom_parse_state_t old_parse_state = STATE_NULL;
bool to_late_to_comment = false;
char cur[100];
int old_style = SCE_ERLANG_DEFAULT;
styler.StartAt(startPos);
for (; sc.More(); sc.Forward()) {
int style = SCE_ERLANG_DEFAULT;
if (STATE_NULL != parse_state) {
switch (parse_state) {
case STATE_NULL : sc.SetState(SCE_ERLANG_DEFAULT); break;
/* COMMENTS ------------------------------------------------------*/
case COMMENT : {
if (sc.ch != '%') {
to_late_to_comment = true;
} else if (!to_late_to_comment && sc.ch == '%') {
// Switch to comment level 2 (Function)
sc.ChangeState(SCE_ERLANG_COMMENT_FUNCTION);
old_style = SCE_ERLANG_COMMENT_FUNCTION;
parse_state = COMMENT_FUNCTION;
sc.Forward();
}
}
// V--- Falling through!
case COMMENT_FUNCTION : {
if (sc.ch != '%') {
to_late_to_comment = true;
} else if (!to_late_to_comment && sc.ch == '%') {
// Switch to comment level 3 (Module)
sc.ChangeState(SCE_ERLANG_COMMENT_MODULE);
old_style = SCE_ERLANG_COMMENT_MODULE;
parse_state = COMMENT_MODULE;
sc.Forward();
}
}
// V--- Falling through!
case COMMENT_MODULE : {
if (parse_state != COMMENT) {
// Search for comment documentation
if (sc.chNext == '@') {
old_parse_state = parse_state;
parse_state = ('{' == sc.ch)
? COMMENT_DOC_MACRO
: COMMENT_DOC;
sc.ForwardSetState(sc.state);
}
}
// All comments types fall here.
if (sc.atLineEnd) {
to_late_to_comment = false;
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case COMMENT_DOC :
// V--- Falling through!
case COMMENT_DOC_MACRO : {
if (!isalnum(sc.ch)) {
// Try to match documentation comment
sc.GetCurrent(cur, sizeof(cur));
if (parse_state == COMMENT_DOC_MACRO
&& erlangDocMacro.InList(cur)) {
sc.ChangeState(SCE_ERLANG_COMMENT_DOC_MACRO);
while (sc.ch != '}' && !sc.atLineEnd)
sc.Forward();
} else if (erlangDoc.InList(cur)) {
sc.ChangeState(SCE_ERLANG_COMMENT_DOC);
} else {
sc.ChangeState(old_style);
}
// Switch back to old state
sc.SetState(old_style);
parse_state = old_parse_state;
}
if (sc.atLineEnd) {
to_late_to_comment = false;
sc.ChangeState(old_style);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* -------------------------------------------------------------- */
/* Atoms ---------------------------------------------------------*/
case ATOM_UNQUOTED : {
if ('@' == sc.ch){
parse_state = NODE_NAME_UNQUOTED;
} else if (sc.ch == ':') {
// Searching for module name
if (sc.chNext == ' ') {
// error
sc.ChangeState(SCE_ERLANG_UNKNOWN);
parse_state = STATE_NULL;
} else {
sc.Forward();
if (isalnum(sc.ch)) {
sc.GetCurrent(cur, sizeof(cur));
sc.ChangeState(SCE_ERLANG_MODULES);
sc.SetState(SCE_ERLANG_MODULES);
}
}
} else if (!IsAWordChar(sc.ch)) {
sc.GetCurrent(cur, sizeof(cur));
if (reservedWords.InList(cur)) {
style = SCE_ERLANG_KEYWORD;
} else if (erlangBIFs.InList(cur)
&& strcmp(cur,"erlang:")){
style = SCE_ERLANG_BIFS;
} else if (sc.ch == '(' || '/' == sc.ch){
style = SCE_ERLANG_FUNCTION_NAME;
} else {
style = SCE_ERLANG_ATOM;
}
sc.ChangeState(style);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case ATOM_QUOTED : {
if ( '@' == sc.ch ){
parse_state = NODE_NAME_QUOTED;
} else if ('\'' == sc.ch && '\\' != sc.chPrev) {
sc.ChangeState(SCE_ERLANG_ATOM);
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* -------------------------------------------------------------- */
/* Node names ----------------------------------------------------*/
case NODE_NAME_UNQUOTED : {
if ('@' == sc.ch) {
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
} else if (!IsAWordChar(sc.ch)) {
sc.ChangeState(SCE_ERLANG_NODE_NAME);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case NODE_NAME_QUOTED : {
if ('@' == sc.ch) {
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
} else if ('\'' == sc.ch && '\\' != sc.chPrev) {
sc.ChangeState(SCE_ERLANG_NODE_NAME_QUOTED);
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* -------------------------------------------------------------- */
/* Records -------------------------------------------------------*/
case RECORD_START : {
if ('\'' == sc.ch) {
parse_state = RECORD_QUOTED;
} else if (isalpha(sc.ch) && islower(sc.ch)) {
parse_state = RECORD_UNQUOTED;
} else { // error
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case RECORD_UNQUOTED : {
if (!IsAWordChar(sc.ch)) {
sc.ChangeState(SCE_ERLANG_RECORD);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case RECORD_QUOTED : {
if ('\'' == sc.ch && '\\' != sc.chPrev) {
sc.ChangeState(SCE_ERLANG_RECORD_QUOTED);
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* -------------------------------------------------------------- */
/* Macros --------------------------------------------------------*/
case MACRO_START : {
if ('\'' == sc.ch) {
parse_state = MACRO_QUOTED;
} else if (isalpha(sc.ch)) {
parse_state = MACRO_UNQUOTED;
} else { // error
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case MACRO_UNQUOTED : {
if (!IsAWordChar(sc.ch)) {
sc.ChangeState(SCE_ERLANG_MACRO);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
case MACRO_QUOTED : {
if ('\'' == sc.ch && '\\' != sc.chPrev) {
sc.ChangeState(SCE_ERLANG_MACRO_QUOTED);
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* -------------------------------------------------------------- */
/* Numerics ------------------------------------------------------*/
/* Simple integer */
case NUMERAL_START : {
if (isdigit(sc.ch)) {
radix_digits *= 10;
radix_digits += sc.ch - '0'; // Assuming ASCII here!
} else if ('#' == sc.ch) {
if (2 > radix_digits || 36 < radix_digits) {
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
} else {
parse_state = NUMERAL_BASE_VALUE;
}
} else if ('.' == sc.ch && isdigit(sc.chNext)) {
radix_digits = 0;
parse_state = NUMERAL_FLOAT;
} else if ('e' == sc.ch || 'E' == sc.ch) {
exponent_digits = 0;
parse_state = NUMERAL_EXPONENT;
} else {
radix_digits = 0;
sc.ChangeState(SCE_ERLANG_NUMBER);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* Integer in other base than 10 (x#yyy) */
case NUMERAL_BASE_VALUE : {
if (!is_radix(radix_digits,sc.ch)) {
radix_digits = 0;
if (!isalnum(sc.ch))
sc.ChangeState(SCE_ERLANG_NUMBER);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* Float (x.yyy) */
case NUMERAL_FLOAT : {
if ('e' == sc.ch || 'E' == sc.ch) {
exponent_digits = 0;
parse_state = NUMERAL_EXPONENT;
} else if (!isdigit(sc.ch)) {
sc.ChangeState(SCE_ERLANG_NUMBER);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
/* Exponent, either integer or float (xEyy, x.yyEzzz) */
case NUMERAL_EXPONENT : {
if (('-' == sc.ch || '+' == sc.ch)
&& (isdigit(sc.chNext))) {
sc.Forward();
} else if (!isdigit(sc.ch)) {
if (0 < exponent_digits)
sc.ChangeState(SCE_ERLANG_NUMBER);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
} else {
++exponent_digits;
}
} break;
/* -------------------------------------------------------------- */
/* Preprocessor --------------------------------------------------*/
case PREPROCESSOR : {
if (!IsAWordChar(sc.ch)) {
sc.GetCurrent(cur, sizeof(cur));
if (erlangPreproc.InList(cur)) {
style = SCE_ERLANG_PREPROC;
} else if (erlangModulesAtt.InList(cur)) {
style = SCE_ERLANG_MODULES_ATT;
}
sc.ChangeState(style);
sc.SetState(SCE_ERLANG_DEFAULT);
parse_state = STATE_NULL;
}
} break;
}
} /* End of : STATE_NULL != parse_state */
else
{
switch (sc.state) {
case SCE_ERLANG_VARIABLE : {
if (!IsAWordChar(sc.ch))
sc.SetState(SCE_ERLANG_DEFAULT);
} break;
case SCE_ERLANG_STRING : {
if (sc.ch == '\"' && sc.chPrev != '\\')
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
} break;
case SCE_ERLANG_COMMENT : {
if (sc.atLineEnd)
sc.SetState(SCE_ERLANG_DEFAULT);
} break;
case SCE_ERLANG_CHARACTER : {
if (sc.chPrev == '\\') {
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
} else if (sc.ch != '\\') {
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
}
} break;
case SCE_ERLANG_OPERATOR : {
if (sc.chPrev == '.') {
if (sc.ch == '*' || sc.ch == '/' || sc.ch == '\\'
|| sc.ch == '^') {
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
} else if (sc.ch == '\'') {
sc.ForwardSetState(SCE_ERLANG_DEFAULT);
} else {
sc.SetState(SCE_ERLANG_DEFAULT);
}
} else {
sc.SetState(SCE_ERLANG_DEFAULT);
}
} break;
}
}
if (sc.state == SCE_ERLANG_DEFAULT) {
bool no_new_state = false;
switch (sc.ch) {
case '\"' : sc.SetState(SCE_ERLANG_STRING); break;
case '$' : sc.SetState(SCE_ERLANG_CHARACTER); break;
case '%' : {
parse_state = COMMENT;
sc.SetState(SCE_ERLANG_COMMENT);
} break;
case '#' : {
parse_state = RECORD_START;
sc.SetState(SCE_ERLANG_UNKNOWN);
} break;
case '?' : {
parse_state = MACRO_START;
sc.SetState(SCE_ERLANG_UNKNOWN);
} break;
case '\'' : {
parse_state = ATOM_QUOTED;
sc.SetState(SCE_ERLANG_UNKNOWN);
} break;
case '+' :
case '-' : {
if (IsADigit(sc.chNext)) {
parse_state = NUMERAL_START;
radix_digits = 0;
sc.SetState(SCE_ERLANG_UNKNOWN);
} else if (sc.ch != '+') {
parse_state = PREPROCESSOR;
sc.SetState(SCE_ERLANG_UNKNOWN);
}
} break;
default : no_new_state = true;
}
if (no_new_state) {
if (isdigit(sc.ch)) {
parse_state = NUMERAL_START;
radix_digits = sc.ch - '0';
sc.SetState(SCE_ERLANG_UNKNOWN);
} else if (isupper(sc.ch) || '_' == sc.ch) {
sc.SetState(SCE_ERLANG_VARIABLE);
} else if (isalpha(sc.ch)) {
parse_state = ATOM_UNQUOTED;
sc.SetState(SCE_ERLANG_UNKNOWN);
} else if (isoperator(static_cast<char>(sc.ch))
|| sc.ch == '\\') {
sc.SetState(SCE_ERLANG_OPERATOR);
}
}
}
}
sc.Complete();
}
static int ClassifyErlangFoldPoint(
Accessor &styler,
int styleNext,
int keyword_start
) {
int lev = 0;
if (styler.Match(keyword_start,"case")
|| (
styler.Match(keyword_start,"fun")
&& (SCE_ERLANG_FUNCTION_NAME != styleNext)
)
|| styler.Match(keyword_start,"if")
|| styler.Match(keyword_start,"query")
|| styler.Match(keyword_start,"receive")
) {
++lev;
} else if (styler.Match(keyword_start,"end")) {
--lev;
}
return lev;
}
static void FoldErlangDoc(
unsigned int startPos, int length, int initStyle,
WordList** /*keywordlists*/, Accessor &styler
) {
unsigned int endPos = startPos + length;
int currentLine = styler.GetLine(startPos);
int lev;
int previousLevel = styler.LevelAt(currentLine) & SC_FOLDLEVELNUMBERMASK;
int currentLevel = previousLevel;
int styleNext = styler.StyleAt(startPos);
int style = initStyle;
int stylePrev;
int keyword_start = 0;
char ch;
char chNext = styler.SafeGetCharAt(startPos);
bool atEOL;
for (unsigned int i = startPos; i < endPos; i++) {
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
// Get styles
stylePrev = style;
style = styleNext;
styleNext = styler.StyleAt(i + 1);
atEOL = ((ch == '\r') && (chNext != '\n')) || (ch == '\n');
if (stylePrev != SCE_ERLANG_KEYWORD
&& style == SCE_ERLANG_KEYWORD) {
keyword_start = i;
}
// Fold on keywords
if (stylePrev == SCE_ERLANG_KEYWORD
&& style != SCE_ERLANG_KEYWORD
&& style != SCE_ERLANG_ATOM
) {
currentLevel += ClassifyErlangFoldPoint(styler,
styleNext,
keyword_start);
}
// Fold on comments
if (style == SCE_ERLANG_COMMENT
|| style == SCE_ERLANG_COMMENT_MODULE
|| style == SCE_ERLANG_COMMENT_FUNCTION) {
if (ch == '%' && chNext == '{') {
currentLevel++;
} else if (ch == '%' && chNext == '}') {
currentLevel--;
}
}
// Fold on braces
if (style == SCE_ERLANG_OPERATOR) {
if (ch == '{' || ch == '(' || ch == '[') {
currentLevel++;
} else if (ch == '}' || ch == ')' || ch == ']') {
currentLevel--;
}
}
if (atEOL) {
lev = previousLevel;
if (currentLevel > previousLevel)
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(currentLine))
styler.SetLevel(currentLine, lev);
currentLine++;
previousLevel = currentLevel;
}
}
// Fill in the real level of the next line, keeping the current flags as they will be filled in later
styler.SetLevel(currentLine,
previousLevel
| (styler.LevelAt(currentLine) & ~SC_FOLDLEVELNUMBERMASK));
}
static const char * const erlangWordListDesc[] = {
"Erlang Reserved words",
"Erlang BIFs",
"Erlang Preprocessor",
"Erlang Module Attributes",
"Erlang Documentation",
"Erlang Documentation Macro",
0
};
LexerModule lmErlang(
SCLEX_ERLANG,
ColouriseErlangDoc,
"erlang",
FoldErlangDoc,
erlangWordListDesc);
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