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335 lines
12 KiB
335 lines
12 KiB
3 years ago
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// Scintilla source code edit control
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/** @file LexPS.cxx
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** Lexer for PostScript
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**
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** Written by Nigel Hathaway <nigel@bprj.co.uk>.
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** The License.txt file describes the conditions under which this software may be distributed.
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**/
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// Previous releases of this lexer included support for marking token starts with
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// a style byte indicator. This was used by the wxGhostscript IDE/debugger.
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// Style byte indicators were removed in version 3.4.3.
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// Anyone wanting to restore this functionality for wxGhostscript using 'modern'
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// indicators can examine the earlier source in the Mercurial repository.
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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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using namespace Lexilla;
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static inline bool IsASelfDelimitingChar(const int ch) {
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return (ch == '[' || ch == ']' || ch == '{' || ch == '}' ||
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ch == '/' || ch == '<' || ch == '>' ||
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ch == '(' || ch == ')' || ch == '%');
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}
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static inline bool IsAWhitespaceChar(const int ch) {
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return (ch == ' ' || ch == '\t' || ch == '\r' ||
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ch == '\n' || ch == '\f' || ch == '\0');
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}
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static bool IsABaseNDigit(const int ch, const int base) {
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int maxdig = '9';
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int letterext = -1;
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if (base <= 10)
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maxdig = '0' + base - 1;
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else
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letterext = base - 11;
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return ((ch >= '0' && ch <= maxdig) ||
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(ch >= 'A' && ch <= ('A' + letterext)) ||
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(ch >= 'a' && ch <= ('a' + letterext)));
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}
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static inline bool IsABase85Char(const int ch) {
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return ((ch >= '!' && ch <= 'u') || ch == 'z');
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}
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static void ColourisePSDoc(
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Sci_PositionU startPos,
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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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WordList &keywords1 = *keywordlists[0];
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WordList &keywords2 = *keywordlists[1];
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WordList &keywords3 = *keywordlists[2];
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WordList &keywords4 = *keywordlists[3];
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WordList &keywords5 = *keywordlists[4];
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StyleContext sc(startPos, length, initStyle, styler);
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int pslevel = styler.GetPropertyInt("ps.level", 3);
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Sci_Position lineCurrent = styler.GetLine(startPos);
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int nestTextCurrent = 0;
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if (lineCurrent > 0 && initStyle == SCE_PS_TEXT)
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nestTextCurrent = styler.GetLineState(lineCurrent - 1);
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int numRadix = 0;
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bool numHasPoint = false;
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bool numHasExponent = false;
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bool numHasSign = false;
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for (; sc.More(); sc.Forward()) {
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if (sc.atLineStart)
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lineCurrent = styler.GetLine(sc.currentPos);
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// Determine if the current state should terminate.
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if (sc.state == SCE_PS_COMMENT || sc.state == SCE_PS_DSC_VALUE) {
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if (sc.atLineEnd) {
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sc.SetState(SCE_C_DEFAULT);
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}
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} else if (sc.state == SCE_PS_DSC_COMMENT) {
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if (sc.ch == ':') {
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sc.Forward();
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if (!sc.atLineEnd)
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sc.SetState(SCE_PS_DSC_VALUE);
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else
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sc.SetState(SCE_C_DEFAULT);
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} else if (sc.atLineEnd) {
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sc.SetState(SCE_C_DEFAULT);
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} else if (IsAWhitespaceChar(sc.ch) && sc.ch != '\r') {
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sc.ChangeState(SCE_PS_COMMENT);
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}
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} else if (sc.state == SCE_PS_NUMBER) {
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if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch)) {
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if ((sc.chPrev == '+' || sc.chPrev == '-' ||
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sc.chPrev == 'E' || sc.chPrev == 'e') && numRadix == 0)
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sc.ChangeState(SCE_PS_NAME);
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sc.SetState(SCE_C_DEFAULT);
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} else if (sc.ch == '#') {
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if (numHasPoint || numHasExponent || numHasSign || numRadix != 0) {
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sc.ChangeState(SCE_PS_NAME);
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} else {
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char szradix[5];
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sc.GetCurrent(szradix, 4);
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numRadix = atoi(szradix);
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if (numRadix < 2 || numRadix > 36)
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sc.ChangeState(SCE_PS_NAME);
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}
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} else if ((sc.ch == 'E' || sc.ch == 'e') && numRadix == 0) {
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if (numHasExponent) {
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sc.ChangeState(SCE_PS_NAME);
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} else {
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numHasExponent = true;
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if (sc.chNext == '+' || sc.chNext == '-')
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sc.Forward();
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}
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} else if (sc.ch == '.') {
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if (numHasPoint || numHasExponent || numRadix != 0) {
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sc.ChangeState(SCE_PS_NAME);
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} else {
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numHasPoint = true;
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}
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} else if (numRadix == 0) {
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if (!IsABaseNDigit(sc.ch, 10))
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sc.ChangeState(SCE_PS_NAME);
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} else {
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if (!IsABaseNDigit(sc.ch, numRadix))
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sc.ChangeState(SCE_PS_NAME);
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}
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} else if (sc.state == SCE_PS_NAME || sc.state == SCE_PS_KEYWORD) {
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if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch)) {
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char s[100];
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sc.GetCurrent(s, sizeof(s));
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if ((pslevel >= 1 && keywords1.InList(s)) ||
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(pslevel >= 2 && keywords2.InList(s)) ||
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(pslevel >= 3 && keywords3.InList(s)) ||
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keywords4.InList(s) || keywords5.InList(s)) {
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sc.ChangeState(SCE_PS_KEYWORD);
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}
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sc.SetState(SCE_C_DEFAULT);
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}
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} else if (sc.state == SCE_PS_LITERAL || sc.state == SCE_PS_IMMEVAL) {
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if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch))
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sc.SetState(SCE_C_DEFAULT);
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} else if (sc.state == SCE_PS_PAREN_ARRAY || sc.state == SCE_PS_PAREN_DICT ||
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sc.state == SCE_PS_PAREN_PROC) {
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sc.SetState(SCE_C_DEFAULT);
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} else if (sc.state == SCE_PS_TEXT) {
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if (sc.ch == '(') {
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nestTextCurrent++;
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} else if (sc.ch == ')') {
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if (--nestTextCurrent == 0)
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sc.ForwardSetState(SCE_PS_DEFAULT);
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} else if (sc.ch == '\\') {
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sc.Forward();
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}
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} else if (sc.state == SCE_PS_HEXSTRING) {
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if (sc.ch == '>') {
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sc.ForwardSetState(SCE_PS_DEFAULT);
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} else if (!IsABaseNDigit(sc.ch, 16) && !IsAWhitespaceChar(sc.ch)) {
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sc.SetState(SCE_PS_HEXSTRING);
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styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
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}
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} else if (sc.state == SCE_PS_BASE85STRING) {
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if (sc.Match('~', '>')) {
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sc.Forward();
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sc.ForwardSetState(SCE_PS_DEFAULT);
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} else if (!IsABase85Char(sc.ch) && !IsAWhitespaceChar(sc.ch)) {
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sc.SetState(SCE_PS_BASE85STRING);
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styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
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}
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}
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// Determine if a new state should be entered.
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if (sc.state == SCE_C_DEFAULT) {
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if (sc.ch == '[' || sc.ch == ']') {
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sc.SetState(SCE_PS_PAREN_ARRAY);
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} else if (sc.ch == '{' || sc.ch == '}') {
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sc.SetState(SCE_PS_PAREN_PROC);
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} else if (sc.ch == '/') {
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if (sc.chNext == '/') {
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sc.SetState(SCE_PS_IMMEVAL);
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sc.Forward();
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} else {
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sc.SetState(SCE_PS_LITERAL);
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}
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} else if (sc.ch == '<') {
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if (sc.chNext == '<') {
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sc.SetState(SCE_PS_PAREN_DICT);
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sc.Forward();
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} else if (sc.chNext == '~') {
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sc.SetState(SCE_PS_BASE85STRING);
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sc.Forward();
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} else {
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sc.SetState(SCE_PS_HEXSTRING);
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}
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} else if (sc.ch == '>' && sc.chNext == '>') {
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sc.SetState(SCE_PS_PAREN_DICT);
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sc.Forward();
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} else if (sc.ch == '>' || sc.ch == ')') {
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sc.SetState(SCE_C_DEFAULT);
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styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
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} else if (sc.ch == '(') {
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sc.SetState(SCE_PS_TEXT);
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nestTextCurrent = 1;
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} else if (sc.ch == '%') {
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if (sc.chNext == '%' && sc.atLineStart) {
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sc.SetState(SCE_PS_DSC_COMMENT);
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sc.Forward();
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if (sc.chNext == '+') {
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sc.Forward();
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sc.ForwardSetState(SCE_PS_DSC_VALUE);
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}
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} else {
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sc.SetState(SCE_PS_COMMENT);
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}
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} else if ((sc.ch == '+' || sc.ch == '-' || sc.ch == '.') &&
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IsABaseNDigit(sc.chNext, 10)) {
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sc.SetState(SCE_PS_NUMBER);
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numRadix = 0;
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numHasPoint = (sc.ch == '.');
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numHasExponent = false;
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numHasSign = (sc.ch == '+' || sc.ch == '-');
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} else if ((sc.ch == '+' || sc.ch == '-') && sc.chNext == '.' &&
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IsABaseNDigit(sc.GetRelative(2), 10)) {
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sc.SetState(SCE_PS_NUMBER);
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numRadix = 0;
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numHasPoint = false;
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numHasExponent = false;
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numHasSign = true;
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} else if (IsABaseNDigit(sc.ch, 10)) {
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sc.SetState(SCE_PS_NUMBER);
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numRadix = 0;
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numHasPoint = false;
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numHasExponent = false;
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numHasSign = false;
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} else if (!IsAWhitespaceChar(sc.ch)) {
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sc.SetState(SCE_PS_NAME);
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}
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}
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if (sc.atLineEnd)
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styler.SetLineState(lineCurrent, nestTextCurrent);
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}
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sc.Complete();
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}
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static void FoldPSDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[],
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Accessor &styler) {
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bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
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bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
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Sci_PositionU endPos = startPos + length;
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int visibleChars = 0;
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Sci_Position lineCurrent = styler.GetLine(startPos);
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int levelCurrent = SC_FOLDLEVELBASE;
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if (lineCurrent > 0)
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levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
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int levelMinCurrent = levelCurrent;
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int levelNext = levelCurrent;
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char chNext = styler[startPos];
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int styleNext = styler.StyleAt(startPos);
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for (Sci_PositionU i = startPos; i < endPos; i++) {
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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int style = styleNext;
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styleNext = styler.StyleAt(i + 1);
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bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n'); //mac??
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if ((style & 31) == SCE_PS_PAREN_PROC) {
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if (ch == '{') {
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// Measure the minimum before a '{' to allow
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// folding on "} {"
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if (levelMinCurrent > levelNext) {
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levelMinCurrent = levelNext;
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}
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levelNext++;
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} else if (ch == '}') {
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levelNext--;
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}
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}
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if (atEOL) {
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int levelUse = levelCurrent;
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if (foldAtElse) {
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levelUse = levelMinCurrent;
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}
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int lev = levelUse | levelNext << 16;
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if (visibleChars == 0 && foldCompact)
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lev |= SC_FOLDLEVELWHITEFLAG;
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if (levelUse < levelNext)
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lev |= SC_FOLDLEVELHEADERFLAG;
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if (lev != styler.LevelAt(lineCurrent)) {
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styler.SetLevel(lineCurrent, lev);
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}
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lineCurrent++;
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levelCurrent = levelNext;
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levelMinCurrent = levelCurrent;
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visibleChars = 0;
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}
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if (!isspacechar(ch))
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visibleChars++;
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}
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}
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static const char * const psWordListDesc[] = {
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"PS Level 1 operators",
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"PS Level 2 operators",
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"PS Level 3 operators",
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"RIP-specific operators",
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"User-defined operators",
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0
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};
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LexerModule lmPS(SCLEX_PS, ColourisePSDoc, "ps", FoldPSDoc, psWordListDesc);
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