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330 lines
10 KiB
330 lines
10 KiB
// Scintilla source code edit control
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/** @file LexCaml.cxx
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** Lexer for Objective Caml.
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**/
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// Copyright 2005-2009 by Robert Roessler <robertr@rftp.com>
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// The License.txt file describes the conditions under which this software may be distributed.
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/* Release History
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20050204 Initial release.
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20050205 Quick compiler standards/"cleanliness" adjustment.
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20050206 Added cast for IsLeadByte().
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20050209 Changes to "external" build support.
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20050306 Fix for 1st-char-in-doc "corner" case.
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20050502 Fix for [harmless] one-past-the-end coloring.
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20050515 Refined numeric token recognition logic.
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20051125 Added 2nd "optional" keywords class.
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20051129 Support "magic" (read-only) comments for RCaml.
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20051204 Swtich to using StyleContext infrastructure.
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20090629 Add full Standard ML '97 support.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include <string>
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#include <string_view>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#if defined(__clang__)
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#pragma clang diagnostic ignored "-Wcomma"
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#endif
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// Since the Microsoft __iscsym[f] funcs are not ANSI...
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inline int iscaml(int c) {return isalnum(c) || c == '_';}
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inline int iscamlf(int c) {return isalpha(c) || c == '_';}
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static const int baseT[24] = {
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0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A - L */
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0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0,16 /* M - X */
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};
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using namespace Lexilla;
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static void ColouriseCamlDoc(
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Sci_PositionU startPos, Sci_Position length,
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int initStyle,
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WordList *keywordlists[],
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Accessor &styler)
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{
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// initialize styler
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StyleContext sc(startPos, length, initStyle, styler);
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Sci_PositionU chToken = 0;
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int chBase = 0, chLit = 0;
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WordList& keywords = *keywordlists[0];
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WordList& keywords2 = *keywordlists[1];
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WordList& keywords3 = *keywordlists[2];
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const bool isSML = keywords.InList("andalso");
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const int useMagic = styler.GetPropertyInt("lexer.caml.magic", 0);
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// set up [initial] state info (terminating states that shouldn't "bleed")
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const int state_ = sc.state & 0x0f;
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if (state_ <= SCE_CAML_CHAR
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|| (isSML && state_ == SCE_CAML_STRING))
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sc.state = SCE_CAML_DEFAULT;
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int nesting = (state_ >= SCE_CAML_COMMENT)? (state_ - SCE_CAML_COMMENT): 0;
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// foreach char in range...
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while (sc.More()) {
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// set up [per-char] state info
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int state2 = -1; // (ASSUME no state change)
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Sci_Position chColor = sc.currentPos - 1;// (ASSUME standard coloring range)
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bool advance = true; // (ASSUME scanner "eats" 1 char)
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// step state machine
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switch (sc.state & 0x0f) {
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case SCE_CAML_DEFAULT:
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chToken = sc.currentPos; // save [possible] token start (JIC)
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// it's wide open; what do we have?
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if (iscamlf(sc.ch))
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state2 = SCE_CAML_IDENTIFIER;
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else if (!isSML && sc.Match('`') && iscamlf(sc.chNext))
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state2 = SCE_CAML_TAGNAME;
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else if (!isSML && sc.Match('#') && isdigit(sc.chNext))
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state2 = SCE_CAML_LINENUM;
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else if (isdigit(sc.ch)) {
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// it's a number, assume base 10
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state2 = SCE_CAML_NUMBER, chBase = 10;
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if (sc.Match('0')) {
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// there MAY be a base specified...
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const char* baseC = "bBoOxX";
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if (isSML) {
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if (sc.chNext == 'w')
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sc.Forward(); // (consume SML "word" indicator)
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baseC = "x";
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}
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// ... change to specified base AS REQUIRED
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if (strchr(baseC, sc.chNext))
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chBase = baseT[tolower(sc.chNext) - 'a'], sc.Forward();
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}
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} else if (!isSML && sc.Match('\'')) // (Caml char literal?)
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state2 = SCE_CAML_CHAR, chLit = 0;
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else if (isSML && sc.Match('#', '"')) // (SML char literal?)
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state2 = SCE_CAML_CHAR, sc.Forward();
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else if (sc.Match('"'))
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state2 = SCE_CAML_STRING;
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else if (sc.Match('(', '*'))
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state2 = SCE_CAML_COMMENT, sc.Forward(), sc.ch = ' '; // (*)...
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else if (strchr("!?~" /* Caml "prefix-symbol" */
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"=<>@^|&+-*/$%" /* Caml "infix-symbol" */
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"()[]{};,:.#", sc.ch) // Caml "bracket" or ;,:.#
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// SML "extra" ident chars
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|| (isSML && (sc.Match('\\') || sc.Match('`'))))
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state2 = SCE_CAML_OPERATOR;
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break;
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case SCE_CAML_IDENTIFIER:
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// [try to] interpret as [additional] identifier char
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if (!(iscaml(sc.ch) || sc.Match('\''))) {
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const Sci_Position n = sc.currentPos - chToken;
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if (n < 24) {
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// length is believable as keyword, [re-]construct token
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char t[24];
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for (Sci_Position i = -n; i < 0; i++)
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t[n + i] = static_cast<char>(sc.GetRelative(i));
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t[n] = '\0';
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// special-case "_" token as KEYWORD
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if ((n == 1 && sc.chPrev == '_') || keywords.InList(t))
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sc.ChangeState(SCE_CAML_KEYWORD);
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else if (keywords2.InList(t))
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sc.ChangeState(SCE_CAML_KEYWORD2);
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else if (keywords3.InList(t))
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sc.ChangeState(SCE_CAML_KEYWORD3);
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}
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state2 = SCE_CAML_DEFAULT, advance = false;
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}
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break;
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case SCE_CAML_TAGNAME:
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// [try to] interpret as [additional] tagname char
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if (!(iscaml(sc.ch) || sc.Match('\'')))
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state2 = SCE_CAML_DEFAULT, advance = false;
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break;
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/*case SCE_CAML_KEYWORD:
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case SCE_CAML_KEYWORD2:
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case SCE_CAML_KEYWORD3:
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// [try to] interpret as [additional] keyword char
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if (!iscaml(ch))
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state2 = SCE_CAML_DEFAULT, advance = false;
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break;*/
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case SCE_CAML_LINENUM:
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// [try to] interpret as [additional] linenum directive char
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if (!isdigit(sc.ch))
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state2 = SCE_CAML_DEFAULT, advance = false;
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break;
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case SCE_CAML_OPERATOR: {
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// [try to] interpret as [additional] operator char
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const char* o = 0;
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if (iscaml(sc.ch) || isspace(sc.ch) // ident or whitespace
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|| (o = strchr(")]};,\'\"#", sc.ch),o) // "termination" chars
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|| (!isSML && sc.Match('`')) // Caml extra term char
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|| (!strchr("!$%&*+-./:<=>?@^|~", sc.ch)// "operator" chars
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// SML extra ident chars
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&& !(isSML && (sc.Match('\\') || sc.Match('`'))))) {
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// check for INCLUSIVE termination
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if (o && strchr(")]};,", sc.ch)) {
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if ((sc.Match(')') && sc.chPrev == '(')
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|| (sc.Match(']') && sc.chPrev == '['))
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// special-case "()" and "[]" tokens as KEYWORDS
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sc.ChangeState(SCE_CAML_KEYWORD);
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chColor++;
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} else
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advance = false;
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state2 = SCE_CAML_DEFAULT;
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}
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break;
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}
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case SCE_CAML_NUMBER:
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// [try to] interpret as [additional] numeric literal char
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if ((!isSML && sc.Match('_')) || IsADigit(sc.ch, chBase))
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break;
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// how about an integer suffix?
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if (!isSML && (sc.Match('l') || sc.Match('L') || sc.Match('n'))
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&& (sc.chPrev == '_' || IsADigit(sc.chPrev, chBase)))
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break;
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// or a floating-point literal?
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if (chBase == 10) {
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// with a decimal point?
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if (sc.Match('.')
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&& ((!isSML && sc.chPrev == '_')
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|| IsADigit(sc.chPrev, chBase)))
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break;
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// with an exponent? (I)
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if ((sc.Match('e') || sc.Match('E'))
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&& ((!isSML && (sc.chPrev == '.' || sc.chPrev == '_'))
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|| IsADigit(sc.chPrev, chBase)))
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break;
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// with an exponent? (II)
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if (((!isSML && (sc.Match('+') || sc.Match('-')))
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|| (isSML && sc.Match('~')))
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&& (sc.chPrev == 'e' || sc.chPrev == 'E'))
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break;
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}
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// it looks like we have run out of number
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state2 = SCE_CAML_DEFAULT, advance = false;
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break;
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case SCE_CAML_CHAR:
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if (!isSML) {
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// [try to] interpret as [additional] char literal char
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if (sc.Match('\\')) {
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chLit = 1; // (definitely IS a char literal)
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if (sc.chPrev == '\\')
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sc.ch = ' '; // (...\\')
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// should we be terminating - one way or another?
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} else if ((sc.Match('\'') && sc.chPrev != '\\')
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|| sc.atLineEnd) {
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state2 = SCE_CAML_DEFAULT;
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if (sc.Match('\''))
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chColor++;
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else
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sc.ChangeState(SCE_CAML_IDENTIFIER);
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// ... maybe a char literal, maybe not
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} else if (chLit < 1 && sc.currentPos - chToken >= 2)
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sc.ChangeState(SCE_CAML_IDENTIFIER), advance = false;
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break;
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}/* else
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// fall through for SML char literal (handle like string) */
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// Falls through.
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case SCE_CAML_STRING:
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// [try to] interpret as [additional] [SML char/] string literal char
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if (isSML && sc.Match('\\') && sc.chPrev != '\\' && isspace(sc.chNext))
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state2 = SCE_CAML_WHITE;
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else if (sc.Match('\\') && sc.chPrev == '\\')
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sc.ch = ' '; // (...\\")
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// should we be terminating - one way or another?
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else if ((sc.Match('"') && sc.chPrev != '\\')
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|| (isSML && sc.atLineEnd)) {
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state2 = SCE_CAML_DEFAULT;
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if (sc.Match('"'))
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chColor++;
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}
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break;
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case SCE_CAML_WHITE:
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// [try to] interpret as [additional] SML embedded whitespace char
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if (sc.Match('\\')) {
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// style this puppy NOW...
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state2 = SCE_CAML_STRING, sc.ch = ' ' /* (...\") */, chColor++,
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styler.ColourTo(chColor, SCE_CAML_WHITE), styler.Flush();
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// ... then backtrack to determine original SML literal type
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Sci_Position p = chColor - 2;
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for (; p >= 0 && styler.StyleAt(p) == SCE_CAML_WHITE; p--) ;
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if (p >= 0)
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state2 = static_cast<int>(styler.StyleAt(p));
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// take care of state change NOW
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sc.ChangeState(state2), state2 = -1;
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}
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break;
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case SCE_CAML_COMMENT:
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case SCE_CAML_COMMENT1:
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case SCE_CAML_COMMENT2:
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case SCE_CAML_COMMENT3:
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// we're IN a comment - does this start a NESTED comment?
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if (sc.Match('(', '*'))
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state2 = sc.state + 1, chToken = sc.currentPos,
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sc.Forward(), sc.ch = ' ' /* (*)... */, nesting++;
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// [try to] interpret as [additional] comment char
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else if (sc.Match(')') && sc.chPrev == '*') {
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if (nesting)
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state2 = (sc.state & 0x0f) - 1, chToken = 0, nesting--;
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else
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state2 = SCE_CAML_DEFAULT;
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chColor++;
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// enable "magic" (read-only) comment AS REQUIRED
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} else if (useMagic && sc.currentPos - chToken == 4
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&& sc.Match('c') && sc.chPrev == 'r' && sc.GetRelative(-2) == '@')
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sc.state |= 0x10; // (switch to read-only comment style)
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break;
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}
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// handle state change and char coloring AS REQUIRED
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if (state2 >= 0)
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styler.ColourTo(chColor, sc.state), sc.ChangeState(state2);
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// move to next char UNLESS re-scanning current char
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if (advance)
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sc.Forward();
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}
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// do any required terminal char coloring (JIC)
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sc.Complete();
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}
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static
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void FoldCamlDoc(
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Sci_PositionU, Sci_Position,
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int,
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WordList *[],
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Accessor &)
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{
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}
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static const char * const camlWordListDesc[] = {
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"Keywords", // primary Objective Caml keywords
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"Keywords2", // "optional" keywords (typically from Pervasives)
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"Keywords3", // "optional" keywords (typically typenames)
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0
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};
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LexerModule lmCaml(SCLEX_CAML, ColouriseCamlDoc, "caml", FoldCamlDoc, camlWordListDesc);
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