lexbash.cxx

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// Scintilla source code edit control
/** @file LexBash.cxx
 ** Lexer for Bash.
 **/
// Copyright 2004-2005 by Neil Hodgson <[e-mail]>
// Adapted from LexPerl by Kein-Hong Man <[e-mail]> 2004
// The License.txt file describes the conditions under which this software may be distributed.

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdarg.h>

#include "Platform.h"

#include "PropSet.h"
#include "Accessor.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"

#define BASH_BASE_ERROR		65
#define BASH_BASE_DECIMAL	66
#define BASH_BASE_HEX		67
#define BASH_BASE_OCTAL		68
#define BASH_BASE_OCTAL_ERROR	69

#define HERE_DELIM_MAX 256

static inline int translateBashDigit(char ch) {
	if (ch >= '0' && ch <= '9') {
		return ch - '0';
	} else if (ch >= 'a' && ch <= 'z') {
		return ch - 'a' + 10;
	} else if (ch >= 'A' && ch <= 'Z') {
		return ch - 'A' + 36;
	} else if (ch == '@') {
		return 62;
	} else if (ch == '_') {
		return 63;
	}
	return BASH_BASE_ERROR;
}

static inline bool isEOLChar(char ch) {
	return (ch == '\r') || (ch == '\n');
}

static bool isSingleCharOp(char ch) {
	char strCharSet[2];
	strCharSet[0] = ch;
	strCharSet[1] = '\0';
	return (NULL != strstr("rwxoRWXOezsfdlpSbctugkTBMACahGLNn", strCharSet));
}

static inline bool isBashOperator(char ch) {
	if (ch == '^' || ch == '&' || ch == '\\' || ch == '%' ||
	        ch == '(' || ch == ')' || ch == '-' || ch == '+' ||
	        ch == '=' || ch == '|' || ch == '{' || ch == '}' ||
	        ch == '[' || ch == ']' || ch == ':' || ch == ';' ||
	        ch == '>' || ch == ',' || ch == '/' || ch == '<' ||
	        ch == '?' || ch == '!' || ch == '.' || ch == '~' ||
		ch == '@')
		return true;
	return false;
}

static int classifyWordBash(unsigned int start, unsigned int end, WordList &keywords, Accessor &styler) {
	char s[100];
	for (unsigned int i = 0; i < end - start + 1 && i < 30; i++) {
		s[i] = styler[start + i];
		s[i + 1] = '\0';
	}
	char chAttr = SCE_SH_IDENTIFIER;
	if (keywords.InList(s))
		chAttr = SCE_SH_WORD;
	styler.ColourTo(end, chAttr);
	return chAttr;
}

static inline int getBashNumberBase(unsigned int start, unsigned int end, Accessor &styler) {
	int base = 0;
	for (unsigned int i = 0; i < end - start + 1 && i < 10; i++) {
		base = base * 10 + (styler[start + i] - '0');
	}
	if (base > 64 || (end - start) > 1) {
		return BASH_BASE_ERROR;
	}
	return base;
}

static inline bool isEndVar(char ch) {
	return !isalnum(ch) && ch != '$' && ch != '_';
}

static inline bool isNonQuote(char ch) {
	return isalnum(ch) || ch == '_';
}

static bool isMatch(Accessor &styler, int lengthDoc, int pos, const char *val) {
	if ((pos + static_cast<int>(strlen(val))) >= lengthDoc) {
		return false;
	}
	while (*val) {
		if (*val != styler[pos++]) {
			return false;
		}
		val++;
	}
	return true;
}

static char opposite(char ch) {
	if (ch == '(')
		return ')';
	if (ch == '[')
		return ']';
	if (ch == '{')
		return '}';
	if (ch == '<')
		return '>';
	return ch;
}

static void ColouriseBashDoc(unsigned int startPos, int length, int initStyle,
                             WordList *keywordlists[], Accessor &styler) {

	// Lexer for bash often has to backtrack to start of current style to determine
	// which characters are being used as quotes, how deeply nested is the
	// start position and what the termination string is for here documents

	WordList &keywords = *keywordlists[0];

	class HereDocCls {
	public:
		int State;		// 0: '<<' encountered
		// 1: collect the delimiter
		// 2: here doc text (lines after the delimiter)
		char Quote;		// the char after '<<'
		bool Quoted;		// true if Quote in ('\'','"','`')
		bool Indent;		// indented delimiter (for <<-)
		int DelimiterLength;	// strlen(Delimiter)
		char *Delimiter;	// the Delimiter, 256: sizeof PL_tokenbuf
		HereDocCls() {
			State = 0;
            Quote = 0;
            Quoted = false;
            Indent = 0;
			DelimiterLength = 0;
			Delimiter = new char[HERE_DELIM_MAX];
			Delimiter[0] = '\0';
		}
		~HereDocCls() {
			delete []Delimiter;
		}
	};
	HereDocCls HereDoc;

	class QuoteCls {
		public:
		int  Rep;
		int  Count;
		char Up;
		char Down;
		QuoteCls() {
			this->New(1);
		}
		void New(int r) {
			Rep   = r;
			Count = 0;
			Up    = '\0';
			Down  = '\0';
		}
		void Open(char u) {
			Count++;
			Up    = u;
			Down  = opposite(Up);
		}
	};
	QuoteCls Quote;

	int state = initStyle;
	int numBase = 0;
	unsigned int lengthDoc = startPos + length;

	// If in a long distance lexical state, seek to the beginning to find quote characters
	// Bash strings can be multi-line with embedded newlines, so backtrack.
	// Bash numbers have additional state during lexing, so backtrack too.
	if (state == SCE_SH_HERE_Q) {
		while ((startPos > 1) && (styler.StyleAt(startPos) != SCE_SH_HERE_DELIM)) {
			startPos--;
		}
		startPos = styler.LineStart(styler.GetLine(startPos));
		state = styler.StyleAt(startPos - 1);
	}
	if (state == SCE_SH_STRING
	 || state == SCE_SH_BACKTICKS
	 || state == SCE_SH_CHARACTER
	 || state == SCE_SH_NUMBER
	 || state == SCE_SH_IDENTIFIER
	 || state == SCE_SH_COMMENTLINE
	) {
		while ((startPos > 1) && (styler.StyleAt(startPos - 1) == state)) {
			startPos--;
		}
		state = SCE_SH_DEFAULT;
	}

	styler.StartAt(startPos);
	char chPrev = styler.SafeGetCharAt(startPos - 1);
	if (startPos == 0)
		chPrev = '\n';
	char chNext = styler[startPos];
	styler.StartSegment(startPos);

	for (unsigned int i = startPos; i < lengthDoc; i++) {
		char ch = chNext;
		// if the current character is not consumed due to the completion of an
		// earlier style, lexing can be restarted via a simple goto
	restartLexer:
		chNext = styler.SafeGetCharAt(i + 1);
		char chNext2 = styler.SafeGetCharAt(i + 2);

		if (styler.IsLeadByte(ch)) {
			chNext = styler.SafeGetCharAt(i + 2);
			chPrev = ' ';
			i += 1;
			continue;
		}

		if ((chPrev == '\r' && ch == '\n')) {	// skip on DOS/Windows
			styler.ColourTo(i, state);
			chPrev = ch;
			continue;
		}

		if (HereDoc.State == 1 && isEOLChar(ch)) {
			// Begin of here-doc (the line after the here-doc delimiter):
			// Lexically, the here-doc starts from the next line after the >>, but the
			// first line of here-doc seem to follow the style of the last EOL sequence
			HereDoc.State = 2;
			if (HereDoc.Quoted) {
				if (state == SCE_SH_HERE_DELIM) {
					// Missing quote at end of string! We are stricter than bash.
					// Colour here-doc anyway while marking this bit as an error.
					state = SCE_SH_ERROR;
				}
				styler.ColourTo(i - 1, state);
				// HereDoc.Quote always == '\''
				state = SCE_SH_HERE_Q;
			} else {
				styler.ColourTo(i - 1, state);
				// always switch
				state = SCE_SH_HERE_Q;
			}
		}

		if (state == SCE_SH_DEFAULT) {
			if (ch == '\\') {	// escaped character
				if (i < lengthDoc - 1)
					i++;
				ch = chNext;
				chNext = chNext2;
				styler.ColourTo(i, SCE_SH_IDENTIFIER);
			} else if (isdigit(ch)) {
				state = SCE_SH_NUMBER;
				numBase = BASH_BASE_DECIMAL;
				if (ch == '0') {	// hex,octal
					if (chNext == 'x' || chNext == 'X') {
						numBase = BASH_BASE_HEX;
						i++;
						ch = chNext;
						chNext = chNext2;
					} else if (isdigit(chNext)) {
						numBase = BASH_BASE_OCTAL;
					}
				}
			} else if (iswordstart(ch)) {
				state = SCE_SH_WORD;
				if (!iswordchar(chNext) && chNext != '+' && chNext != '-') {
					// We need that if length of word == 1!
					// This test is copied from the SCE_SH_WORD handler.
					classifyWordBash(styler.GetStartSegment(), i, keywords, styler);
					state = SCE_SH_DEFAULT;
				}
			} else if (ch == '#') {
				state = SCE_SH_COMMENTLINE;
			} else if (ch == '\"') {
				state = SCE_SH_STRING;
				Quote.New(1);
				Quote.Open(ch);
			} else if (ch == '\'') {
				state = SCE_SH_CHARACTER;
				Quote.New(1);
				Quote.Open(ch);
			} else if (ch == '`') {
				state = SCE_SH_BACKTICKS;
				Quote.New(1);
				Quote.Open(ch);
			} else if (ch == '$') {
				if (chNext == '{') {
					state = SCE_SH_PARAM;
					goto startQuote;
				} else if (chNext == '\'') {
					state = SCE_SH_CHARACTER;
					goto startQuote;
				} else if (chNext == '"') {
					state = SCE_SH_STRING;
					goto startQuote;
				} else if (chNext == '(' && chNext2 == '(') {
					styler.ColourTo(i, SCE_SH_OPERATOR);
					state = SCE_SH_DEFAULT;
					goto skipChar;
				} else if (chNext == '(' || chNext == '`') {
					state = SCE_SH_BACKTICKS;
				startQuote:
					Quote.New(1);
					Quote.Open(chNext);
					goto skipChar;
				} else {
					state = SCE_SH_SCALAR;
				skipChar:
					i++;
					ch = chNext;
					chNext = chNext2;
				}
			} else if (ch == '*') {
				if (chNext == '*') {	// exponentiation
					i++;
					ch = chNext;
					chNext = chNext2;