549 lines
19 KiB
C++
549 lines
19 KiB
C++
// Scintilla source code edit control
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/** @file LexOScript.cxx
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** Lexer for OScript sources; ocx files and/or OSpace dumps.
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** OScript is a programming language used to develop applications for the
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** Livelink server platform.
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**/
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// Written by Ferdinand Prantl <prantlf@gmail.com>, inspired by the code from
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// LexVB.cxx and LexPascal.cxx. The License.txt file describes the conditions
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// under which this software may be distributed.
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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 "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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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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// -----------------------------------------
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// Functions classifying a single character.
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// This function is generic and should be probably moved to CharSet.h where
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// IsAlphaNumeric the others reside.
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inline bool IsAlpha(int ch) {
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return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
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}
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static inline bool IsIdentifierChar(int ch) {
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// Identifiers cannot contain non-ASCII letters; a word with non-English
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// language-specific characters cannot be an identifier.
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return IsAlphaNumeric(ch) || ch == '_';
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}
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static inline bool IsIdentifierStart(int ch) {
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// Identifiers cannot contain non-ASCII letters; a word with non-English
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// language-specific characters cannot be an identifier.
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return IsAlpha(ch) || ch == '_';
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}
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static inline bool IsNumberChar(int ch, int chNext) {
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// Numeric constructs are not checked for lexical correctness. They are
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// expected to look like +1.23-E9 but actually any bunch of the following
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// characters will be styled as number.
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// KNOWN PROBLEM: if you put + or - operators immediately after a number
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// and the next operand starts with the letter E, the operator will not be
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// recognized and it will be styled together with the preceding number.
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// This should not occur; at least not often. The coding style recommends
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// putting spaces around operators.
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return IsADigit(ch) || toupper(ch) == 'E' || ch == '.' ||
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((ch == '-' || ch == '+') && toupper(chNext) == 'E');
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}
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// This function checks for the start or a natural number without any symbols
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// or operators as a prefix; the IsPrefixedNumberStart should be called
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// immediately after this one to cover all possible numeric constructs.
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static inline bool IsNaturalNumberStart(int ch) {
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return IsADigit(ch) != 0;
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}
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static inline bool IsPrefixedNumberStart(int ch, int chNext) {
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// KNOWN PROBLEM: if you put + or - operators immediately before a number
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// the operator will not be recognized and it will be styled together with
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// the succeeding number. This should not occur; at least not often. The
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// coding style recommends putting spaces around operators.
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return (ch == '.' || ch == '-' || ch == '+') && IsADigit(chNext);
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}
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static inline bool IsOperator(int ch) {
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return strchr("%^&*()-+={}[]:;<>,/?!.~|\\", ch) != NULL;
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}
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// ---------------------------------------------------------------
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// Functions classifying a token currently processed in the lexer.
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// Checks if the current line starts with the preprocessor directive used
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// usually to introduce documentation comments: #ifdef DOC. This method is
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// supposed to be called if the line has been recognized as a preprocessor
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// directive already.
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static bool IsDocCommentStart(StyleContext &sc) {
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// Check the line back to its start only if the end looks promising.
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if (sc.LengthCurrent() == 10 && !IsAlphaNumeric(sc.ch)) {
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char s[11];
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sc.GetCurrentLowered(s, sizeof(s));
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return strcmp(s, "#ifdef doc") == 0;
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}
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return false;
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}
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// Checks if the current line starts with the preprocessor directive that
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// is complementary to the #ifdef DOC start: #endif. This method is supposed
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// to be called if the current state point to the documentation comment.
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// QUESTIONAL ASSUMPTION: The complete #endif directive is not checked; just
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// the starting #e. However, there is no other preprocessor directive with
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// the same starting letter and thus this optimization should always work.
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static bool IsDocCommentEnd(StyleContext &sc) {
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return sc.ch == '#' && sc.chNext == 'e';
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}
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class IdentifierClassifier {
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WordList &keywords; // Passed from keywords property.
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WordList &constants; // Passed from keywords2 property.
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WordList &operators; // Passed from keywords3 property.
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WordList &types; // Passed from keywords4 property.
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WordList &functions; // Passed from keywords5 property.
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WordList &objects; // Passed from keywords6 property.
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IdentifierClassifier(IdentifierClassifier const&);
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IdentifierClassifier& operator=(IdentifierClassifier const&);
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public:
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IdentifierClassifier(WordList *keywordlists[]) :
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keywords(*keywordlists[0]), constants(*keywordlists[1]),
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operators(*keywordlists[2]), types(*keywordlists[3]),
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functions(*keywordlists[4]), objects(*keywordlists[5])
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{}
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void ClassifyIdentifier(StyleContext &sc) {
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// Opening parenthesis following an identifier makes it a possible
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// function call.
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// KNOWN PROBLEM: If some whitespace is inserted between the
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// identifier and the parenthesis they will not be able to be
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// recognized as a function call. This should not occur; at
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// least not often. Such coding style would be weird.
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if (sc.Match('(')) {
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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// Before an opening brace can be control statements and
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// operators too; function call is the last option.
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if (keywords.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_KEYWORD);
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} else if (operators.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_OPERATOR);
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} else if (functions.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_FUNCTION);
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} else {
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sc.ChangeState(SCE_OSCRIPT_METHOD);
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}
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sc.SetState(SCE_OSCRIPT_OPERATOR);
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} else {
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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// A dot following an identifier means an access to an object
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// member. The related object identifier can be special.
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// KNOWN PROBLEM: If there is whitespace between the identifier
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// and the following dot, the identifier will not be recognized
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// as an object in an object member access. If it is one of the
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// listed static objects it will not be styled.
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if (sc.Match('.') && objects.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_OBJECT);
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sc.SetState(SCE_OSCRIPT_OPERATOR);
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} else {
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if (keywords.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_KEYWORD);
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} else if (constants.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_CONSTANT);
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} else if (operators.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_OPERATOR);
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} else if (types.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_TYPE);
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} else if (functions.InList(s)) {
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sc.ChangeState(SCE_OSCRIPT_FUNCTION);
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}
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sc.SetState(SCE_OSCRIPT_DEFAULT);
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}
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}
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}
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};
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// ------------------------------------------------
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// Function colourising an excerpt of OScript code.
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static void ColouriseOScriptDoc(unsigned int startPos, int length,
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int initStyle, WordList *keywordlists[],
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Accessor &styler) {
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// I wonder how whole-line styles ended by EOLN can escape the resetting
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// code in the loop below and overflow to the next line. Let us make sure
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// that a new line does not start with them carried from the previous one.
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// NOTE: An overflowing string is intentionally not checked; it reminds
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// the developer that the string must be ended on the same line.
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if (initStyle == SCE_OSCRIPT_LINE_COMMENT ||
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initStyle == SCE_OSCRIPT_PREPROCESSOR) {
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initStyle = SCE_OSCRIPT_DEFAULT;
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}
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styler.StartAt(startPos);
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StyleContext sc(startPos, length, initStyle, styler);
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IdentifierClassifier identifierClassifier(keywordlists);
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// It starts with true at the beginning of a line and changes to false as
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// soon as the first non-whitespace character has been processed.
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bool isFirstToken = true;
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// It starts with true at the beginning of a line and changes to false as
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// soon as the first identifier on the line is passed by.
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bool isFirstIdentifier = true;
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// It becomes false when #ifdef DOC (the preprocessor directive often
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// used to start a documentation comment) is encountered and remain false
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// until the end of the documentation block is not detected. This is done
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// by checking for the complementary #endif preprocessor directive.
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bool endDocComment = false;
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for (; sc.More(); sc.Forward()) {
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if (sc.atLineStart) {
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isFirstToken = true;
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isFirstIdentifier = true;
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// Detect the current state is neither whitespace nor identifier. It
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// means that no next identifier can be the first token on the line.
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} else if (isFirstIdentifier && sc.state != SCE_OSCRIPT_DEFAULT &&
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sc.state != SCE_OSCRIPT_IDENTIFIER) {
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isFirstIdentifier = false;
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}
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// Check if the current state should be changed.
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if (sc.state == SCE_OSCRIPT_OPERATOR) {
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// Multiple-symbol operators are marked by single characters.
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sc.SetState(SCE_OSCRIPT_DEFAULT);
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} else if (sc.state == SCE_OSCRIPT_IDENTIFIER) {
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if (!IsIdentifierChar(sc.ch)) {
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// Colon after an identifier makes it a label if it is the
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// first token on the line.
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// KNOWN PROBLEM: If some whitespace is inserted between the
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// identifier and the colon they will not be recognized as a
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// label. This should not occur; at least not often. It would
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// make the code structure less legible and examples in the
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// Livelink documentation do not show it.
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if (sc.Match(':') && isFirstIdentifier) {
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sc.ChangeState(SCE_OSCRIPT_LABEL);
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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} else {
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identifierClassifier.ClassifyIdentifier(sc);
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}
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// Avoid a sequence of two words be mistaken for a label. A
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// switch case would be an example.
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isFirstIdentifier = false;
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}
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} else if (sc.state == SCE_OSCRIPT_GLOBAL) {
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if (!IsIdentifierChar(sc.ch)) {
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sc.SetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_PROPERTY) {
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if (!IsIdentifierChar(sc.ch)) {
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// Any member access introduced by the dot operator is
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// initially marked as a property access. If an opening
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// parenthesis is detected later it is changed to method call.
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// KNOWN PROBLEM: The same as at the function call recognition
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// for SCE_OSCRIPT_IDENTIFIER above.
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if (sc.Match('(')) {
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sc.ChangeState(SCE_OSCRIPT_METHOD);
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}
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sc.SetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_NUMBER) {
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if (!IsNumberChar(sc.ch, sc.chNext)) {
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sc.SetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_SINGLEQUOTE_STRING) {
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if (sc.ch == '\'') {
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// Two consequential apostrophes convert to a single one.
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if (sc.chNext == '\'') {
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sc.Forward();
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} else {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.atLineEnd) {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_DOUBLEQUOTE_STRING) {
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if (sc.ch == '\"') {
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// Two consequential quotation marks convert to a single one.
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if (sc.chNext == '\"') {
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sc.Forward();
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} else {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.atLineEnd) {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_BLOCK_COMMENT) {
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if (sc.Match('*', '/')) {
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sc.Forward();
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_LINE_COMMENT) {
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if (sc.atLineEnd) {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_PREPROCESSOR) {
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if (IsDocCommentStart(sc)) {
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sc.ChangeState(SCE_OSCRIPT_DOC_COMMENT);
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endDocComment = false;
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} else if (sc.atLineEnd) {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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} else if (sc.state == SCE_OSCRIPT_DOC_COMMENT) {
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// KNOWN PROBLEM: The first line detected that would close a
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// conditional preprocessor block (#endif) the documentation
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// comment block will end. (Nested #if-#endif blocks are not
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// supported. Hopefully it will not occur often that a line
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// within the text block would stat with #endif.
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if (isFirstToken && IsDocCommentEnd(sc)) {
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endDocComment = true;
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} else if (sc.atLineEnd && endDocComment) {
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sc.ForwardSetState(SCE_OSCRIPT_DEFAULT);
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}
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}
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// Check what state starts with the current character.
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if (sc.state == SCE_OSCRIPT_DEFAULT) {
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if (sc.Match('\'')) {
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sc.SetState(SCE_OSCRIPT_SINGLEQUOTE_STRING);
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} else if (sc.Match('\"')) {
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sc.SetState(SCE_OSCRIPT_DOUBLEQUOTE_STRING);
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} else if (sc.Match('/', '/')) {
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sc.SetState(SCE_OSCRIPT_LINE_COMMENT);
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sc.Forward();
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} else if (sc.Match('/', '*')) {
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sc.SetState(SCE_OSCRIPT_BLOCK_COMMENT);
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sc.Forward();
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} else if (isFirstToken && sc.Match('#')) {
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sc.SetState(SCE_OSCRIPT_PREPROCESSOR);
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} else if (sc.Match('$')) {
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// Both process-global ($xxx) and thread-global ($$xxx)
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// variables are handled as one global.
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sc.SetState(SCE_OSCRIPT_GLOBAL);
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} else if (IsNaturalNumberStart(sc.ch)) {
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sc.SetState(SCE_OSCRIPT_NUMBER);
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} else if (IsPrefixedNumberStart(sc.ch, sc.chNext)) {
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sc.SetState(SCE_OSCRIPT_NUMBER);
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sc.Forward();
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} else if (sc.Match('.') && IsIdentifierStart(sc.chNext)) {
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// Every object member access is marked as a property access
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// initially. The decision between property and method is made
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// after parsing the identifier and looking what comes then.
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// KNOWN PROBLEM: If there is whitespace between the following
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// identifier and the dot, the dot will not be recognized
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// as a member accessing operator. In turn, the identifier
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// will not be recognizable as a property or a method too.
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sc.SetState(SCE_OSCRIPT_OPERATOR);
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sc.Forward();
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sc.SetState(SCE_OSCRIPT_PROPERTY);
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} else if (IsIdentifierStart(sc.ch)) {
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sc.SetState(SCE_OSCRIPT_IDENTIFIER);
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} else if (IsOperator(sc.ch)) {
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sc.SetState(SCE_OSCRIPT_OPERATOR);
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}
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}
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if (isFirstToken && !IsASpaceOrTab(sc.ch)) {
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isFirstToken = false;
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}
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}
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sc.Complete();
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}
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// ------------------------------------------
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// Functions supporting OScript code folding.
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static inline bool IsBlockComment(int style) {
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return style == SCE_OSCRIPT_BLOCK_COMMENT;
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}
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static bool IsLineComment(int line, Accessor &styler) {
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int pos = styler.LineStart(line);
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int eolPos = styler.LineStart(line + 1) - 1;
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for (int i = pos; i < eolPos; i++) {
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char ch = styler[i];
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char chNext = styler.SafeGetCharAt(i + 1);
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int style = styler.StyleAt(i);
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if (ch == '/' && chNext == '/' && style == SCE_OSCRIPT_LINE_COMMENT) {
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return true;
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} else if (!IsASpaceOrTab(ch)) {
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return false;
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}
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}
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return false;
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}
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static inline bool IsPreprocessor(int style) {
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return style == SCE_OSCRIPT_PREPROCESSOR ||
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style == SCE_OSCRIPT_DOC_COMMENT;
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}
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static void GetRangeLowered(unsigned int start, unsigned int end,
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Accessor &styler, char *s, unsigned int len) {
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unsigned int i = 0;
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while (i < end - start + 1 && i < len - 1) {
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s[i] = static_cast<char>(tolower(styler[start + i]));
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i++;
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}
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s[i] = '\0';
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}
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static void GetForwardWordLowered(unsigned int start, Accessor &styler,
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char *s, unsigned int len) {
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unsigned int i = 0;
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while (i < len - 1 && IsAlpha(styler.SafeGetCharAt(start + i))) {
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s[i] = static_cast<char>(tolower(styler.SafeGetCharAt(start + i)));
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i++;
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}
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s[i] = '\0';
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}
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static void UpdatePreprocessorFoldLevel(int &levelCurrent,
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unsigned int startPos, Accessor &styler) {
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char s[7]; // Size of the longest possible keyword + null.
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GetForwardWordLowered(startPos, styler, s, sizeof(s));
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if (strcmp(s, "ifdef") == 0 ||
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strcmp(s, "ifndef") == 0) {
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levelCurrent++;
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} else if (strcmp(s, "endif") == 0) {
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levelCurrent--;
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if (levelCurrent < SC_FOLDLEVELBASE) {
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levelCurrent = SC_FOLDLEVELBASE;
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}
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}
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}
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static void UpdateKeywordFoldLevel(int &levelCurrent, unsigned int lastStart,
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unsigned int currentPos, Accessor &styler) {
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char s[9];
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GetRangeLowered(lastStart, currentPos, styler, s, sizeof(s));
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if (strcmp(s, "if") == 0 || strcmp(s, "for") == 0 ||
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strcmp(s, "switch") == 0 || strcmp(s, "function") == 0 ||
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strcmp(s, "while") == 0 || strcmp(s, "repeat") == 0) {
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levelCurrent++;
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} else if (strcmp(s, "end") == 0 || strcmp(s, "until") == 0) {
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levelCurrent--;
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if (levelCurrent < SC_FOLDLEVELBASE) {
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levelCurrent = SC_FOLDLEVELBASE;
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}
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}
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}
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// ------------------------------
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// Function folding OScript code.
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static void FoldOScriptDoc(unsigned int startPos, int length, int initStyle,
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WordList *[], Accessor &styler) {
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bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
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bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
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bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
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int endPos = startPos + length;
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int visibleChars = 0;
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int lineCurrent = styler.GetLine(startPos);
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int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
|
|
int levelCurrent = levelPrev;
|
|
char chNext = styler[startPos];
|
|
int styleNext = styler.StyleAt(startPos);
|
|
int style = initStyle;
|
|
int lastStart = 0;
|
|
|
|
for (int i = startPos; i < endPos; i++) {
|
|
char ch = chNext;
|
|
chNext = styler.SafeGetCharAt(i + 1);
|
|
int stylePrev = style;
|
|
style = styleNext;
|
|
styleNext = styler.StyleAt(i + 1);
|
|
bool atLineEnd = (ch == '\r' && chNext != '\n') || (ch == '\n');
|
|
|
|
if (foldComment && IsBlockComment(style)) {
|
|
if (!IsBlockComment(stylePrev)) {
|
|
levelCurrent++;
|
|
} else if (!IsBlockComment(styleNext) && !atLineEnd) {
|
|
// Comments do not end at end of line and the next character
|
|
// may not be styled.
|
|
levelCurrent--;
|
|
}
|
|
}
|
|
if (foldComment && atLineEnd && IsLineComment(lineCurrent, styler)) {
|
|
if (!IsLineComment(lineCurrent - 1, styler) &&
|
|
IsLineComment(lineCurrent + 1, styler))
|
|
levelCurrent++;
|
|
else if (IsLineComment(lineCurrent - 1, styler) &&
|
|
!IsLineComment(lineCurrent+1, styler))
|
|
levelCurrent--;
|
|
}
|
|
if (foldPreprocessor) {
|
|
if (ch == '#' && IsPreprocessor(style)) {
|
|
UpdatePreprocessorFoldLevel(levelCurrent, i + 1, styler);
|
|
}
|
|
}
|
|
|
|
if (stylePrev != SCE_OSCRIPT_KEYWORD && style == SCE_OSCRIPT_KEYWORD) {
|
|
lastStart = i;
|
|
}
|
|
if (stylePrev == SCE_OSCRIPT_KEYWORD) {
|
|
if(IsIdentifierChar(ch) && !IsIdentifierChar(chNext)) {
|
|
UpdateKeywordFoldLevel(levelCurrent, lastStart, i, styler);
|
|
}
|
|
}
|
|
|
|
if (!IsASpace(ch))
|
|
visibleChars++;
|
|
|
|
if (atLineEnd) {
|
|
int level = levelPrev;
|
|
if (visibleChars == 0 && foldCompact)
|
|
level |= SC_FOLDLEVELWHITEFLAG;
|
|
if ((levelCurrent > levelPrev) && (visibleChars > 0))
|
|
level |= SC_FOLDLEVELHEADERFLAG;
|
|
if (level != styler.LevelAt(lineCurrent)) {
|
|
styler.SetLevel(lineCurrent, level);
|
|
}
|
|
lineCurrent++;
|
|
levelPrev = levelCurrent;
|
|
visibleChars = 0;
|
|
}
|
|
}
|
|
|
|
// If we did not reach EOLN in the previous loop, store the line level and
|
|
// whitespace information. The rest will be filled in later.
|
|
int lev = levelPrev;
|
|
if (visibleChars == 0 && foldCompact)
|
|
lev |= SC_FOLDLEVELWHITEFLAG;
|
|
styler.SetLevel(lineCurrent, lev);
|
|
}
|
|
|
|
// --------------------------------------------
|
|
// Declaration of the OScript lexer descriptor.
|
|
|
|
static const char * const oscriptWordListDesc[] = {
|
|
"Keywords and reserved words",
|
|
"Literal constants",
|
|
"Literal operators",
|
|
"Built-in value and reference types",
|
|
"Built-in global functions",
|
|
"Built-in static objects",
|
|
0
|
|
};
|
|
|
|
LexerModule lmOScript(SCLEX_OSCRIPT, ColouriseOScriptDoc, "oscript", FoldOScriptDoc, oscriptWordListDesc);
|