// Scintilla source code edit control
/** @file LexOthers.cxx
 ** Lexers for batch files, diff results, properties files, make files and error lists.
 ** Also lexer for LaTeX documents.
 **/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// 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"

// Temporary patch, we should put this in SciLexer.h, I suppose
#define SCE_BAT_DEFAULT 0
#define SCE_BAT_COMMENT 1
#define SCE_BAT_WORD 2
#define SCE_BAT_LABEL 3
#define SCE_BAT_HIDE 4
#define SCE_BAT_COMMAND 5
#define SCE_BAT_IDENTIFIER 6
#define SCE_BAT_OPERATOR 7

#define SCE_MAKE_DEFAULT 0
#define SCE_MAKE_COMMENT 1
#define SCE_MAKE_PREPROCESSOR 2
#define SCE_MAKE_IDENTIFIER 3
#define SCE_MAKE_OPERATOR 4
#define SCE_MAKE_IDEOL 9

static void ColouriseBatchLine(
		char *lineBuffer,
		unsigned int lengthLine,
		unsigned int startLine,
		unsigned int endPos,
		WordList &keywords,
		Accessor &styler) {

	unsigned int i = 0;
	unsigned int state = SCE_BAT_DEFAULT;

	while (isspacechar(lineBuffer[i]) && (i < lengthLine)) {	// Skip initial spaces
		i++;
	}
	if (lineBuffer[i] == '@') {	// Hide command (ECHO OFF)
		styler.ColourTo(startLine + i, SCE_BAT_HIDE);
		i++;
		while (isspacechar(lineBuffer[i]) && (i < lengthLine)) {	// Skip next spaces
			i++;
		}
	}
	if (lineBuffer[i] == ':') {
		// Label
		if (lineBuffer[i + 1] == ':') {
			// :: is a fake label, similar to REM, see http://www.winmag.com/columns/explorer/2000/21.htm
			styler.ColourTo(endPos, SCE_BAT_COMMENT);
		} else {	// Real label
			styler.ColourTo(endPos, SCE_BAT_LABEL);
		}
	} else {
		// Check if initial word is a keyword
		char wordBuffer[21];
		unsigned int wbl = 0, offset = i;
		// Copy word in buffer
		for (; offset < lengthLine && wbl < 20 &&
		        !isspacechar(lineBuffer[offset]); wbl++, offset++) {
			wordBuffer[wbl] = static_cast<char>(tolower(lineBuffer[offset]));
		}
		wordBuffer[wbl] = '\0';
		// Check if it is in the list
		if (keywords.InList(wordBuffer)) {
			styler.ColourTo(startLine + offset - 1, SCE_BAT_WORD);	// Regular keyword
		} else {
			// Search end of word (can be a long path)
			while (offset < lengthLine &&
					!isspacechar(lineBuffer[offset])) {
				offset++;
			}
			styler.ColourTo(startLine + offset - 1, SCE_BAT_COMMAND);	// External command / program
		}
		// Remainder of the line: colourise the variables.
		while (offset < lengthLine) {
			if (state == SCE_BAT_DEFAULT && lineBuffer[offset] == '%') {
				styler.ColourTo(startLine + offset - 1, state);
				if (isdigit(lineBuffer[offset + 1])) {
					styler.ColourTo(startLine + offset + 1, SCE_BAT_IDENTIFIER);
					offset += 2;
				} else if (lineBuffer[offset + 1] == '%' &&
						!isspacechar(lineBuffer[offset + 2])) {
					// Should be safe, as there is CRLF at the end of the line...
					styler.ColourTo(startLine + offset + 2, SCE_BAT_IDENTIFIER);
					offset += 3;
				} else {
					state = SCE_BAT_IDENTIFIER;
				}
			} else if (state == SCE_BAT_IDENTIFIER && lineBuffer[offset] == '%') {
				styler.ColourTo(startLine + offset, state);
				state = SCE_BAT_DEFAULT;
			} else if (state == SCE_BAT_DEFAULT &&
					(lineBuffer[offset] == '*' ||
					lineBuffer[offset] == '?' ||
					lineBuffer[offset] == '=' ||
					lineBuffer[offset] == '<' ||
					lineBuffer[offset] == '>' ||
					lineBuffer[offset] == '|')) {
				styler.ColourTo(startLine + offset - 1, state);
				styler.ColourTo(startLine + offset, SCE_BAT_OPERATOR);
			}
			offset++;
		}
//		if (endPos > startLine + offset - 1) {
			styler.ColourTo(endPos, SCE_BAT_DEFAULT);		// Remainder of line, currently not lexed
//		}
	}
}
// ToDo: (not necessarily at beginning of line) GOTO, [IF] NOT, ERRORLEVEL
// IF [NO] (test) (command) -- test is EXIST (filename) | (string1)==(string2) | ERRORLEVEL (number)
// FOR %%(variable) IN (set) DO (command) -- variable is [a-zA-Z] -- eg for %%X in (*.txt) do type %%X
// ToDo: %n (parameters), %EnvironmentVariable% colourising
// ToDo: Colourise = > >> < | "

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

	char lineBuffer[1024];
    WordList &keywords = *keywordlists[0];

	styler.StartAt(startPos);
	styler.StartSegment(startPos);
	unsigned int linePos = 0, startLine = startPos;
	for (unsigned int i = startPos; i <= startPos + length; i++) {
		lineBuffer[linePos++] = styler[i];
		if (styler[i] == '\r' || styler[i] == '\n' || (linePos >=
		        sizeof(lineBuffer) - 1)) {
			// End of line (or of line buffer) met, colourise it
			if (styler[i + 1] == '\n') {
				lineBuffer[linePos++] = styler[++i];
			}
			lineBuffer[linePos] = '\0';
			ColouriseBatchLine(lineBuffer, linePos, startLine, i, keywords, styler);
			linePos = 0;
			startLine = i + 1;
		}
	}
	if (linePos > 0) {
		ColouriseBatchLine(lineBuffer, linePos, startLine, startPos + length,
		                   keywords, styler);
	}
}

static void ColouriseDiffLine(char *lineBuffer, int endLine, Accessor &styler) {
	// It is needed to remember the current state to recognize starting
	// comment lines before the first "diff " or "--- ". If a real
	// difference starts then each line starting with ' ' is a whitespace
	// otherwise it is considered a comment (Only in..., Binary file...)
	if (0 == strncmp(lineBuffer, "diff ", 3)) {
		styler.ColourTo(endLine, 2);
	} else if (0 == strncmp(lineBuffer, "--- ", 3)) {
		styler.ColourTo(endLine, 3);
	} else if (0 == strncmp(lineBuffer, "+++ ", 3)) {
		styler.ColourTo(endLine, 3);
	} else if (lineBuffer[0] == '@') {
		styler.ColourTo(endLine, 4);
	} else if (lineBuffer[0] == '-') {
		styler.ColourTo(endLine, 5);
	} else if (lineBuffer[0] == '+') {
		styler.ColourTo(endLine, 6);
	} else if (lineBuffer[0] != ' ') {
		styler.ColourTo(endLine, 1);
	} else {
		styler.ColourTo(endLine, 0);
	}
}

static void ColouriseDiffDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
	char lineBuffer[1024];
	styler.StartAt(startPos);
	styler.StartSegment(startPos);
	unsigned int linePos = 0;
	for (unsigned int i = startPos; i < startPos + length; i++) {
		lineBuffer[linePos++] = styler[i];
		if (styler[i] == '\r' || styler[i] == '\n' || (linePos >= sizeof(lineBuffer) - 1)) {
			ColouriseDiffLine(lineBuffer, i, styler);
			linePos = 0;
		}
	}
	if (linePos > 0)
		ColouriseDiffLine(lineBuffer, startPos + length, styler);
}

static void ColourisePropsLine(
		char *lineBuffer,
		unsigned int lengthLine,
		unsigned int startLine,
		unsigned int endPos,
		Accessor &styler) {

	unsigned int i = 0;
	while (isspacechar(lineBuffer[i]) && (i < lengthLine))	// Skip initial spaces
		i++;
	if (lineBuffer[i] == '#' || lineBuffer[i] == '!' || lineBuffer[i] == ';') {
		styler.ColourTo(endPos, 1);
	} else if (lineBuffer[i] == '[') {
		styler.ColourTo(endPos, 2);
	} else if (lineBuffer[i] == '@') {
		styler.ColourTo(startLine+i, 4);
		if (lineBuffer[++i] == '=')
			styler.ColourTo(startLine+i, 3);
		styler.ColourTo(endPos, 0);
	} else {
		while (lineBuffer[i] != '=' && (i < lengthLine))	// Search the '=' character
			i++;
		if (lineBuffer[i] == '=') {
			styler.ColourTo(startLine+i-1, 0);
			styler.ColourTo(startLine+i, 3);
			styler.ColourTo(endPos, 0);
		} else {
			styler.ColourTo(endPos, 0);
		}
	}
}

static void ColourisePropsDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
	char lineBuffer[1024];
	styler.StartAt(startPos);
	styler.StartSegment(startPos);
	unsigned int linePos = 0, startLine = startPos;
	for (unsigned int i = startPos; i <= startPos + length; i++) {
		lineBuffer[linePos++] = styler[i];
		if ((styler[i] == '\r' && styler.SafeGetCharAt(i+1) != '\n') ||
			styler[i] == '\n' ||
			(linePos >= sizeof(lineBuffer) - 1)) {
				lineBuffer[linePos] = '\0';
				ColourisePropsLine(lineBuffer, linePos, startLine, i, styler);
				linePos = 0;
				startLine = i+1;
		}
	}
	if (linePos > 0)
		ColourisePropsLine(lineBuffer, linePos, startLine, startPos + length, styler);
}

static void ColouriseMakeLine(
		char *lineBuffer,
		unsigned int lengthLine,
		unsigned int startLine,
		unsigned int endPos,
		Accessor &styler) {

	unsigned int i = 0;
	unsigned int state = SCE_MAKE_DEFAULT;
	bool bSpecial = false;
	// Skip initial spaces
	while (isspacechar(lineBuffer[i]) && (i < lengthLine)) {
		i++;
	}
	if (lineBuffer[i] == '#') {	// Comment
		styler.ColourTo(endPos, SCE_MAKE_COMMENT);
		return;
	}
	if (lineBuffer[i] == '!') {	// Special directive
		styler.ColourTo(endPos, SCE_MAKE_PREPROCESSOR);
		return;
	}
	while (i < lengthLine) {
		if (lineBuffer[i] == '$' && lineBuffer[i+1] == '(') {
			styler.ColourTo(startLine + i - 1, state);
			state = SCE_MAKE_IDENTIFIER;
		} else if (state == SCE_MAKE_IDENTIFIER && lineBuffer[i] == ')') {
			styler.ColourTo(startLine + i, state);
			state = SCE_MAKE_DEFAULT;
		}
		if (!bSpecial && state == SCE_MAKE_DEFAULT &&
				(lineBuffer[i] == ':' || lineBuffer[i] == '=')) {
			styler.ColourTo(startLine + i - 1, state);
			styler.ColourTo(startLine + i, SCE_MAKE_OPERATOR);
			bSpecial = true;	// Only react to the first '=' or ':' of the line
		}
		i++;
	}
	if (state == SCE_MAKE_IDENTIFIER) {
		styler.ColourTo(endPos, SCE_MAKE_IDEOL);	// Error, variable reference not ended
	} else {
		styler.ColourTo(endPos, SCE_MAKE_DEFAULT);
	}
}

static void ColouriseMakeDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
	char lineBuffer[1024];
	styler.StartAt(startPos);
	styler.StartSegment(startPos);
	unsigned int linePos = 0, startLine = startPos;
	for (unsigned int i = startPos; i <= startPos + length; i++) {
		lineBuffer[linePos++] = styler[i];
		if (styler[i] == '\r' || styler[i] == '\n' || (linePos >= sizeof(lineBuffer) - 1)) {
			lineBuffer[linePos] = '\0';
			ColouriseMakeLine(lineBuffer, linePos, startLine, i, styler);
			linePos = 0;
			startLine = i+1;
		}
	}
	if (linePos > 0) {
		ColouriseMakeLine(lineBuffer, linePos, startLine, startPos + length, styler);
	}
}

static void ColouriseErrorListLine(
		char *lineBuffer,
		unsigned int lengthLine,
//		unsigned int startLine,
		unsigned int endPos,
		Accessor &styler) {

	if (lineBuffer[0] == '>') {
		// Command or return status
		styler.ColourTo(endPos, SCE_ERR_CMD);
	} else if (strstr(lineBuffer, "File \"") && strstr(lineBuffer, ", line ")) {
		styler.ColourTo(endPos, SCE_ERR_PYTHON);
	} else if (0 == strncmp(lineBuffer, "Error ", strlen("Error "))) {
		// Borland error message
		styler.ColourTo(endPos, SCE_ERR_BORLAND);
	} else if (0 == strncmp(lineBuffer, "Warning ", strlen("Warning "))) {
		// Borland warning message
		styler.ColourTo(endPos, SCE_ERR_BORLAND);
	} else if (strstr(lineBuffer, " at "  ) &&
		strstr(lineBuffer, " at "  ) < lineBuffer+lengthLine &&
		strstr(lineBuffer, " line ") &&
		strstr(lineBuffer, " line ") < lineBuffer+lengthLine) {
		// perl error message
		styler.ColourTo(endPos, SCE_ERR_PERL);
	} else {
		// Look for <filename>:<line>:message
		// Look for <filename>(line)message
		// Look for <filename>(line,pos)message
		int state = 0;
		for (unsigned int i = 0; i < lengthLine; i++) {
			if (state == 0 && lineBuffer[i] == ':' && isdigit(lineBuffer[i + 1])) {
				state = 1;
			} else if (state == 0 && lineBuffer[i] == '(') {
				state = 10;
			} else if (state == 1 && isdigit(lineBuffer[i])) {
				state = 2;
			} else if (state == 2 && lineBuffer[i] == ':') {
				state = 3;
				break;
			} else if (state == 2 && !isdigit(lineBuffer[i])) {
				state = 99;
			} else if (state == 10 && isdigit(lineBuffer[i])) {
				state = 11;
			} else if (state == 11 && lineBuffer[i] == ',') {
				state = 14;
			} else if (state == 11 && lineBuffer[i] == ')') {
				state = 12;
			} else if (state == 12 && lineBuffer[i] == ':') {
				state = 13;
			} else if (state == 14 && lineBuffer[i] == ')') {
				state = 15;
				break;
			} else if (((state == 11) || (state == 14)) && !((lineBuffer[i] == ' ') || isdigit(lineBuffer[i]))) {
				state = 99;
			}
		}
		if (state == 3) {
			styler.ColourTo(endPos, SCE_ERR_GCC);
		} else if ((state == 13) || (state == 14) || (state == 15)) {
			styler.ColourTo(endPos, SCE_ERR_MS);
		} else {
			styler.ColourTo(endPos, SCE_ERR_DEFAULT);
		}
	}
}

static void ColouriseErrorListDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
	char lineBuffer[1024];
	styler.StartAt(startPos);
	styler.StartSegment(startPos);
	unsigned int linePos = 0;
	for (unsigned int i = startPos; i <= startPos + length; i++) {
		lineBuffer[linePos++] = styler[i];
		if (styler[i] == '\r' || styler[i] == '\n' || (linePos >= sizeof(lineBuffer) - 1)) {
			ColouriseErrorListLine(lineBuffer, linePos, i, styler);
			linePos = 0;
		}
	}
	if (linePos > 0)
		ColouriseErrorListLine(lineBuffer, linePos, startPos + length, styler);
}

static int isSpecial(char s) {
	return (s == '\\') || (s == ',') || (s == ';') || (s == '\'') || (s == ' ') ||
	       (s == '\"') || (s == '`') || (s == '^') || (s == '~');
}

static int isTag(int start, Accessor &styler) {
	char s[6];
	unsigned int i = 0, e=1;
	while (i < 5 && e) {
		s[i] = styler[start + i];
		i++;
		e = styler[start + i] != '{';
	}
	s[i] = '\0';
	return (strcmp(s, "begin") == 0) || (strcmp(s, "end") == 0);
}

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

	styler.StartAt(startPos);

	int state = initStyle;
	char chNext = styler[startPos];
	styler.StartSegment(startPos);
	int lengthDoc = startPos + length;

	for (int i = startPos; i < lengthDoc; i++) {
		char ch = chNext;
		chNext = styler.SafeGetCharAt(i + 1);

		if (styler.IsLeadByte(ch)) {
			chNext = styler.SafeGetCharAt(i + 2);
			i++;
			continue;
		}
		switch(state) {
			case SCE_L_DEFAULT :
				switch(ch) {
					case '\\' :
						styler.ColourTo(i - 1, state);
						if (isSpecial(styler[i + 1])) {
							styler.ColourTo(i + 1, SCE_L_COMMAND);
							i++;
							chNext = styler.SafeGetCharAt(i + 1);
						}
						else {
						    if (isTag(i+1, styler))
							state = SCE_L_TAG;
						    else
						    	state = SCE_L_COMMAND;
						}
						break;
					case '$' :
						styler.ColourTo(i - 1, state);
						state = SCE_L_MATH;
						if (chNext == '$') {
							i++;
							chNext = styler.SafeGetCharAt(i + 1);
						}
						break;
					case '%' :
						styler.ColourTo(i - 1, state);
						state = SCE_L_COMMENT;
						break;
				}
				break;
			case SCE_L_COMMAND :
				if (chNext == '[' || chNext == '{' || chNext == '}' ||
				    chNext == ' ' || chNext == '\r' || chNext == '\n') {
					styler.ColourTo(i, state);
					state = SCE_L_DEFAULT;
					i++;
					chNext = styler.SafeGetCharAt(i + 1);
				}
				break;
			case SCE_L_TAG :
				if (ch == '}') {
					styler.ColourTo(i, state);
					state = SCE_L_DEFAULT;
				}
				break;
			case SCE_L_MATH :
				if (ch == '$') {
					if (chNext == '$') {
						i++;
						chNext = styler.SafeGetCharAt(i + 1);
					}
					styler.ColourTo(i, state);
					state = SCE_L_DEFAULT;
				}
				break;
			case SCE_L_COMMENT :
				if (ch == '\r' || ch == '\n') {
					styler.ColourTo(i - 1, state);
					state = SCE_L_DEFAULT;
				}
		}
	}
	styler.ColourTo(lengthDoc, state);
}

LexerModule lmBatch(SCLEX_BATCH, ColouriseBatchDoc);
LexerModule lmDiff(SCLEX_DIFF, ColouriseDiffDoc);
LexerModule lmProps(SCLEX_PROPERTIES, ColourisePropsDoc);
LexerModule lmMake(SCLEX_MAKEFILE, ColouriseMakeDoc);
LexerModule lmErrorList(SCLEX_ERRORLIST, ColouriseErrorListDoc);
LexerModule lmLatex(SCLEX_LATEX, ColouriseLatexDoc);