mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-01 11:56:58 -05:00
348 lines
12 KiB
C++
348 lines
12 KiB
C++
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// Scintilla source code edit control
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/** @file LexA68k.cxx
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** Lexer for Assembler, just for the MASM syntax
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** Written by Martial Demolins AKA Folco
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**/
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// Copyright 2010 Martial Demolins <mdemolins(a)gmail.com>
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// The License.txt file describes the conditions under which this software
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// 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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// Return values for GetOperatorType
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#define NO_OPERATOR 0
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#define OPERATOR_1CHAR 1
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#define OPERATOR_2CHAR 2
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/**
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* IsIdentifierStart
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*
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* Return true if the given char is a valid identifier first char
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*/
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static inline bool IsIdentifierStart (const int ch)
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{
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return (isalpha(ch) || (ch == '_') || (ch == '\\'));
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}
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/**
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* IsIdentifierChar
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*
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* Return true if the given char is a valid identifier char
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*/
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static inline bool IsIdentifierChar (const int ch)
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{
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return (isalnum(ch) || (ch == '_') || (ch == '@') || (ch == ':') || (ch == '.'));
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}
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/**
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* GetOperatorType
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*
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* Return:
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* NO_OPERATOR if char is not an operator
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* OPERATOR_1CHAR if the operator is one char long
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* OPERATOR_2CHAR if the operator is two chars long
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*/
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static inline int GetOperatorType (const int ch1, const int ch2)
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{
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int OpType = NO_OPERATOR;
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if ((ch1 == '+') || (ch1 == '-') || (ch1 == '*') || (ch1 == '/') || (ch1 == '#') ||
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(ch1 == '(') || (ch1 == ')') || (ch1 == '~') || (ch1 == '&') || (ch1 == '|') || (ch1 == ','))
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OpType = OPERATOR_1CHAR;
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else if ((ch1 == ch2) && (ch1 == '<' || ch1 == '>'))
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OpType = OPERATOR_2CHAR;
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return OpType;
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}
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/**
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* IsBin
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*
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* Return true if the given char is 0 or 1
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*/
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static inline bool IsBin (const int ch)
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{
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return (ch == '0') || (ch == '1');
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}
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/**
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* IsDoxygenChar
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*
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* Return true if the char may be part of a Doxygen keyword
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*/
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static inline bool IsDoxygenChar (const int ch)
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{
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return isalpha(ch) || (ch == '$') || (ch == '[') || (ch == ']') || (ch == '{') || (ch == '}');
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}
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/**
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* ColouriseA68kDoc
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*
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* Main function, which colourises a 68k source
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*/
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static void ColouriseA68kDoc (unsigned int startPos, int length, int initStyle, WordList *keywordlists[], Accessor &styler)
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{
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// Used to buffer a string, to be able to compare it using built-in functions
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char Buffer[100];
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// Used to know the length of an operator
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int OpType;
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// Get references to keywords lists
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WordList &cpuInstruction = *keywordlists[0];
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WordList ®isters = *keywordlists[1];
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WordList &directive = *keywordlists[2];
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WordList &extInstruction = *keywordlists[3];
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WordList &alert = *keywordlists[4];
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WordList &doxygenKeyword = *keywordlists[5];
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// Instanciate a context for our source
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StyleContext sc(startPos, length, initStyle, styler);
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/************************************************************
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*
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* Parse the source
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*
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************************************************************/
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for ( ; sc.More(); sc.Forward())
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{
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/************************************************************
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*
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* A style always terminates at the end of a line, even for
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* comments (no multi-lines comments)
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*
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************************************************************/
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if (sc.atLineStart) {
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sc.SetState(SCE_A68K_DEFAULT);
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}
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/************************************************************
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*
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* If we are not in "default style", check if the style continues
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* In this case, we just have to loop
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*
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************************************************************/
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if (sc.state != SCE_A68K_DEFAULT)
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{
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if ( ((sc.state == SCE_A68K_NUMBER_DEC) && isdigit(sc.ch)) // Decimal number
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|| ((sc.state == SCE_A68K_NUMBER_BIN) && IsBin(sc.ch)) // Binary number
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|| ((sc.state == SCE_A68K_NUMBER_HEX) && isxdigit(sc.ch)) // Hexa number
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|| ((sc.state == SCE_A68K_MACRO_ARG) && isdigit(sc.ch)) // Macro argument
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|| ((sc.state == SCE_A68K_STRING1) && (sc.ch != '\'')) // String single-quoted
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|| ((sc.state == SCE_A68K_STRING2) && (sc.ch != '\"')) // String double-quoted
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|| ((sc.state == SCE_A68K_MACRO_DECLARATION) && IsIdentifierChar(sc.ch)) // Macro declaration (or global label, we don't know at this point)
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|| ((sc.state == SCE_A68K_IDENTIFIER) && IsIdentifierChar(sc.ch)) // Identifier
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|| ((sc.state == SCE_A68K_LABEL) && IsIdentifierChar(sc.ch)) // Label (local)
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|| ((sc.state == SCE_A68K_COMMENT_DOXYGEN) && IsDoxygenChar(sc.ch)) // Doxygen keyword
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|| ((sc.state == SCE_A68K_COMMENT_SPECIAL) && isalpha(sc.ch)) // Alert
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|| ((sc.state == SCE_A68K_COMMENT) && !isalpha(sc.ch) && (sc.ch != '\\'))) // Normal comment
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{
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continue;
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}
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/************************************************************
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*
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* Check if current state terminates
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*
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************************************************************/
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// Strings: include terminal ' or " in the current string by skipping it
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if ((sc.state == SCE_A68K_STRING1) || (sc.state == SCE_A68K_STRING2)) {
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sc.Forward();
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}
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// If a macro declaration was terminated with ':', it was a label
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else if ((sc.state == SCE_A68K_MACRO_DECLARATION) && (sc.chPrev == ':')) {
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sc.ChangeState(SCE_A68K_LABEL);
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}
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// If it wasn't a Doxygen keyword, change it to normal comment
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else if (sc.state == SCE_A68K_COMMENT_DOXYGEN) {
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sc.GetCurrent(Buffer, sizeof(Buffer));
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if (!doxygenKeyword.InList(Buffer)) {
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sc.ChangeState(SCE_A68K_COMMENT);
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}
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sc.SetState(SCE_A68K_COMMENT);
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continue;
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}
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// If it wasn't an Alert, change it to normal comment
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else if (sc.state == SCE_A68K_COMMENT_SPECIAL) {
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sc.GetCurrent(Buffer, sizeof(Buffer));
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if (!alert.InList(Buffer)) {
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sc.ChangeState(SCE_A68K_COMMENT);
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}
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// Reset style to normal comment, or to Doxygen keyword if it begins with '\'
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if (sc.ch == '\\') {
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sc.SetState(SCE_A68K_COMMENT_DOXYGEN);
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}
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else {
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sc.SetState(SCE_A68K_COMMENT);
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}
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continue;
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}
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// If we are in a comment, it's a Doxygen keyword or an Alert
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else if (sc.state == SCE_A68K_COMMENT) {
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if (sc.ch == '\\') {
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sc.SetState(SCE_A68K_COMMENT_DOXYGEN);
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}
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else {
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sc.SetState(SCE_A68K_COMMENT_SPECIAL);
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}
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continue;
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}
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// Check if we are at the end of an identifier
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// In this case, colourise it if was a keyword.
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else if ((sc.state == SCE_A68K_IDENTIFIER) && !IsIdentifierChar(sc.ch)) {
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sc.GetCurrentLowered(Buffer, sizeof(Buffer)); // Buffer the string of the current context
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if (cpuInstruction.InList(Buffer)) { // And check if it belongs to a keyword list
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sc.ChangeState(SCE_A68K_CPUINSTRUCTION);
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}
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else if (extInstruction.InList(Buffer)) {
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sc.ChangeState(SCE_A68K_EXTINSTRUCTION);
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}
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else if (registers.InList(Buffer)) {
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sc.ChangeState(SCE_A68K_REGISTER);
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}
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else if (directive.InList(Buffer)) {
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sc.ChangeState(SCE_A68K_DIRECTIVE);
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}
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}
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// All special contexts are now handled.Come back to default style
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sc.SetState(SCE_A68K_DEFAULT);
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}
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/************************************************************
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*
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* Check if we must enter a new state
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*
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************************************************************/
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// Something which begins at the beginning of a line, and with
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// - '\' + an identifier start char, or
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// - '\\@' + an identifier start char
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// is a local label (second case is used for macro local labels). We set it already as a label, it can't be a macro/equ declaration
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if (sc.atLineStart && (sc.ch < 0x80) && IsIdentifierStart(sc.chNext) && (sc.ch == '\\')) {
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sc.SetState(SCE_A68K_LABEL);
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}
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if (sc.atLineStart && (sc.ch < 0x80) && (sc.ch == '\\') && (sc.chNext == '\\')) {
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sc.Forward(2);
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if ((sc.ch == '@') && IsIdentifierStart(sc.chNext)) {
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sc.ChangeState(SCE_A68K_LABEL);
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sc.SetState(SCE_A68K_LABEL);
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}
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}
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// Label and macro identifiers start at the beginning of a line
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// We set both as a macro id, but if it wasn't one (':' at the end),
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// it will be changed as a label.
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if (sc.atLineStart && (sc.ch < 0x80) && IsIdentifierStart(sc.ch)) {
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sc.SetState(SCE_A68K_MACRO_DECLARATION);
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}
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else if ((sc.ch < 0x80) && (sc.ch == ';')) { // Default: alert in a comment. If it doesn't match
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sc.SetState(SCE_A68K_COMMENT); // with an alert, it will be toggle to a normal comment
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}
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else if ((sc.ch < 0x80) && isdigit(sc.ch)) { // Decimal numbers haven't prefix
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sc.SetState(SCE_A68K_NUMBER_DEC);
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}
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else if ((sc.ch < 0x80) && (sc.ch == '%')) { // Binary numbers are prefixed with '%'
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sc.SetState(SCE_A68K_NUMBER_BIN);
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}
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else if ((sc.ch < 0x80) && (sc.ch == '$')) { // Hexadecimal numbers are prefixed with '$'
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sc.SetState(SCE_A68K_NUMBER_HEX);
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}
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else if ((sc.ch < 0x80) && (sc.ch == '\'')) { // String (single-quoted)
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sc.SetState(SCE_A68K_STRING1);
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}
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else if ((sc.ch < 0x80) && (sc.ch == '\"')) { // String (double-quoted)
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sc.SetState(SCE_A68K_STRING2);
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}
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else if ((sc.ch < 0x80) && (sc.ch == '\\') && (isdigit(sc.chNext))) { // Replacement symbols in macro are prefixed with '\'
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sc.SetState(SCE_A68K_MACRO_ARG);
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}
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else if ((sc.ch < 0x80) && IsIdentifierStart(sc.ch)) { // An identifier: constant, label, etc...
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sc.SetState(SCE_A68K_IDENTIFIER);
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}
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else {
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if (sc.ch < 0x80) {
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OpType = GetOperatorType(sc.ch, sc.chNext); // Check if current char is an operator
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if (OpType != NO_OPERATOR) {
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sc.SetState(SCE_A68K_OPERATOR);
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if (OpType == OPERATOR_2CHAR) { // Check if the operator is 2 bytes long
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sc.ForwardSetState(SCE_A68K_OPERATOR); // (>> or <<)
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}
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}
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}
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}
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} // End of for()
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sc.Complete();
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}
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// Names of the keyword lists
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static const char * const a68kWordListDesc[] =
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{
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"CPU instructions",
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"Registers",
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"Directives",
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"Extended instructions",
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"Comment special words",
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"Doxygen keywords",
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0
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};
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LexerModule lmA68k(SCLEX_A68K, ColouriseA68kDoc, "a68k", 0, a68kWordListDesc);
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